The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

Event Notification Report for June 18, 1999

                    U.S. Nuclear Regulatory Commission
                              Operations Center

                              Event Reports For
                           06/17/1999 - 06/18/1999

                              ** EVENT NUMBERS **

35790  35833  35835  35836  35837  35838  35839  35840  35841  35842  

+------------------------------------------------------------------------------+
|Fuel Cycle Facility                              |Event Number:   35790       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PADUCAH GASEOUS DIFFUSION PLANT      |NOTIFICATION DATE: 06/03/1999|
|   RXTYPE: URANIUM ENRICHMENT FACILITY          |NOTIFICATION TIME: 14:44[EDT]|
| COMMENTS: 2 DEMOCRACY CENTER                   |EVENT DATE:        06/02/1999|
|           6903 ROCKLEDGE DRIVE                 |EVENT TIME:        16:30[CDT]|
|           BETHESDA, MD 20817    (301)564-3200  |LAST UPDATE DATE:  06/17/1999|
|    CITY:  PADUCAH                  REGION:  3  +-----------------------------+
|  COUNTY:  McCRACKEN                 STATE:  KY |PERSON          ORGANIZATION |
|LICENSE#:  GDP-1                 AGREEMENT:  Y  |DAVID HILLS          R3      |
|  DOCKET:  0707001                              |DON COOL             NMSS    |
+------------------------------------------------+                             |
| NRC NOTIFIED BY:  THOMAS WHITE                 |                             |
|  HQ OPS OFFICER:  FANGIE JONES                 |                             |
+------------------------------------------------+                             |
|EMERGENCY CLASS:          N/A                   |                             |
|10 CFR SECTION:                                 |                             |
|OCBA 76.120(c)(2)(i)     ACCID MT EQUIP FAILS   |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+------------------------------------------------------------------------------+

                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| THREE SPRINKLER SYSTEMS DECLARED INOPERABLE DUE TO CORRODED HEADS (24-hour   |
| report)                                                                      |
|                                                                              |
| The following text is a portion of a facsimile received from Paducah:        |
|                                                                              |
| "On 06/02/99 at 1630 CDT, the Plant Shift Superintendent (PSS) was notified  |
| that numerous sprinkler heads were corroded, affecting 16 sprinkler systems  |
| in C-337 and 1 system in C-333, such that the ability of the sprinklers to   |
| flow sufficient water was called into question.  Subsequently, these         |
| sprinkler systems were declared inoperable, and TSR-required actions         |
| establishing roving fire patrols were initiated.  This deficiency was        |
| detected during scheduled system inspections conducted by Fire Protection    |
| personnel.  Currently, functionality of the sprinkler heads has not been     |
| fully evaluated by Fire Protection personnel, and the remaining cascade      |
| buildings are currently being inspected, and if necessary, this report will  |
| be updated to identify any additional areas.                                 |
|                                                                              |
| "It has been determined that this event is reportable under                  |
| 10CFR76.120(c)(2) as an event in which equipment is disabled or fails to     |
| function as designed."                                                       |
|                                                                              |
| The NRC resident inspector has been notified of this event.                  |
|                                                                              |
| ******************** UPDATE RECEIVED AT 1022 EDT ON 06/04/99 FROM CAGE TO    |
| TROCINE *******************                                                  |
|                                                                              |
| The following text is a portion of a facsimile received from Paducah:        |
|                                                                              |
| "Two sprinkle heads on system D-1 in C-337 and two sprinkler heads on system |
| 27 in C-335 were identified to also be corroded.  These were identified to   |
| the PSS on 06/03/99 at 1600 CDT and 1601 CDT, respectively, and determined   |
| to require an update to this report by the PSS.                              |
|                                                                              |
| "It has been determined that this event is reportable under                  |
| 10CFR76.120(c)(2) as an event in which equipment is disabled or fails to     |
| function as designed."                                                       |
|                                                                              |
| Paducah personnel notified the NRC resident inspector of this update.  The   |
| NRC operations officer notified the R3DO (Hills) and NMSS EO (Combs).        |
|                                                                              |
| *********** UPDATE RECEIVED AT 2152 EDT ON 06/17/99 FROM WALKER TO POERTNER  |
| ***********                                                                  |
|                                                                              |
| The following text is a portion of a facsimile received from Paducah:        |
|                                                                              |
| "Three sprinkler heads on system C-15 and five sprinkler heads on system B-8 |
| in C-333 were identified to also be corroded.  The PSS was notified of this  |
| condition at 1300 CDT on 06/17/99 and determined that an update to this      |
| report was required."                                                        |
|                                                                              |
| "It has been determined that this event is reportable under                  |
| 10CFR76.120(c)(2) as an event in which equipment is disabled or fails to     |
| function as designed."                                                       |
|                                                                              |
| Paducah personnel notified the NRC resident inspector of this update.  The   |
| NRC operations officer notified the R3DO (Madera).                           |
+------------------------------------------------------------------------------+

!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED  !!!!!!!
+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35833       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: DIABLO CANYON            REGION:  4  |NOTIFICATION DATE: 06/16/1999|
|    UNIT:  [1] [2] []                STATE:  CA |NOTIFICATION TIME: 19:01[EDT]|
|   RXTYPE: [1] W-4-LP,[2] W-4-LP                |EVENT DATE:        06/16/1999|
+------------------------------------------------+EVENT TIME:        15:40[PDT]|
| NRC NOTIFIED BY:  BARBARA HANSEN-HARRIS        |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  FANGIE JONES                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JOHN PELLET          R4      |
|10 CFR SECTION:                                 |                             |
|DDDD 73.71               UNSPECIFIED PARAGRAPH  |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1     N          Y       100      Power Operation  |100      Power Operation  |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| PHYSICAL SECURITY REPORT                                                     |
|                                                                              |
| Unescorted access granted inappropriately, immediate compensatory measures   |
| taken upon discovery.  The licensee notified the NRC Resident Inspector.     |
|                                                                              |
| Refer to HOO Log for additional details.                                     |
|                                                                              |
| * * * RETRACTION 1215 6/17/99 FROM BARBARA HANSEN-HARRIS TAKEN BY STRANSKY * |
| * *                                                                          |
|                                                                              |
| After discussion with the Region IV security inspector, the licensee has     |
| determined that this event is loggable, and not reportable.  The NRC         |
| resident inspector will be informed by the licensee.  Notified R4DO          |
| (Pellet).                                                                    |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35835       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: GINNA                    REGION:  1  |NOTIFICATION DATE: 06/17/1999|
|    UNIT:  [1] [] []                 STATE:  NY |NOTIFICATION TIME: 09:06[EDT]|
|   RXTYPE: [1] W-2-LP                           |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        08:26[EDT]|
| NRC NOTIFIED BY:  DOUGLAS PETERSON             |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  DOUG WEAVER                  +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JIMI YEROKUN         R1      |
|10 CFR SECTION:                                 |                             |
|DDDD 73.71               UNSPECIFIED PARAGRAPH  |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| A CONTRACTOR HAD HIS SITE ACCESS REVOKED DUE TO A  DISCOVERY MADE RELATING   |
| TO HIS PREVIOUS WORK HISTORY.  THE LICENSEE WILL NOTIFY THE NRC RESIDENT     |
| INSPECTOR.                                                                   |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35836       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: LIMERICK                 REGION:  1  |NOTIFICATION DATE: 06/17/1999|
|    UNIT:  [] [2] []                 STATE:  PA |NOTIFICATION TIME: 12:01[EDT]|
|   RXTYPE: [1] GE-4,[2] GE-4                    |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        10:15[EDT]|
| NRC NOTIFIED BY:  PETER GARDNER                |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  WILLIAM POERTNER             +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JIMI YEROKUN         R1      |
|10 CFR SECTION:                                 |                             |
|AESF 50.72(b)(2)(ii)     ESF ACTUATION          |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|                                                   |                          |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| INADVERTENT ESF ACTUATION.                                                   |
|                                                                              |
| During preparations for overspeed surveillance testing of the D23 diesel     |
| generator an inadvertent 'C' emergency service water pump start signal was   |
| received causing the pump to start.  The cause of the event was personnel    |
| error by an I&C technician during installation of a speed signal generator.  |
| The speed tachometer was being calibrated and was set at 900 rpm when the    |
| speed signal generator used for overspeed testing was hooked up.  Normally   |
| the calibration would be complete and the signal generator set at zero rpm   |
| prior to hookup.  All systems responded as expected.                         |
|                                                                              |
| The NRC resident inspector was notified.                                     |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Fuel Cycle Facility                              |Event Number:   35837       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PORTSMOUTH GASEOUS DIFFUSION PLANT   |NOTIFICATION DATE: 06/17/1999|
|   RXTYPE: URANIUM ENRICHMENT FACILITY          |NOTIFICATION TIME: 14:15[EDT]|
| COMMENTS: 2 DEMOCRACY CENTER                   |EVENT DATE:        06/16/1999|
|           6903 ROCKLEDGE DRIVE                 |EVENT TIME:        16:31[EDT]|
|           BETHESDA, MD 20817    (301)564-3200  |LAST UPDATE DATE:  06/17/1999|
|    CITY:  PIKETON                  REGION:  3  +-----------------------------+
|  COUNTY:  PIKE                      STATE:  OH |PERSON          ORGANIZATION |
|LICENSE#:  GDP-2                 AGREEMENT:  N  |JOHN MADERA          R3      |
|  DOCKET:  0707002                              |FREDRICK COMBS       NMSS    |
+------------------------------------------------+                             |
| NRC NOTIFIED BY:  JIM McCLEERY                 |                             |
|  HQ OPS OFFICER:  WILLIAM POERTNER             |                             |
+------------------------------------------------+                             |
|EMERGENCY CLASS:                                |                             |
|10 CFR SECTION:                                 |                             |
|NCFR                     NON CFR REPORT REQMNT  |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+------------------------------------------------------------------------------+

                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| ACTUATION OF A "Q" SAFETY SYSTEM.                                            |
|                                                                              |
| At 1631 hours on 6/16/99, operations personnel responded to a high voltage   |
| outleakage smokehead alarm at the X-333 Low Assay Withdrawal (LAW) condenser |
| accumulator area.  Operators responded per alarm response procedures and     |
| checked for outleakage and observed smoke at Instrument Control Panel (ICP)  |
| Number 13.  Operators immediately evacuated the area, called 911, and        |
| initiated a building recall.                                                 |
|                                                                              |
| The Emergency Response Organization (ERO) responded and monitored air        |
| quality for hydrogen fluoride, airborne radioactivity, and surveyed for      |
| surface contamination.  All sample results were less than minimum detectable |
| activity.  Investigation determined that a Dalton fitting in ICP#13 was      |
| cross threaded and was considered a possible source of the outleakage.       |
|                                                                              |
| This is reportable as a valid actuation of a "Q" safety system in accordance |
| with Safety Analysis Report, Section 6.9 (24-Hour Report).                   |
|                                                                              |
| The NRC resident inspector has been notified.                                |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35838       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: BROWNS FERRY             REGION:  2  |NOTIFICATION DATE: 06/17/1999|
|    UNIT:  [] [2] []                 STATE:  AL |NOTIFICATION TIME: 17:27[EDT]|
|   RXTYPE: [1] GE-4,[2] GE-4,[3] GE-4           |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        13:37[CDT]|
| NRC NOTIFIED BY:  DON SMITH                    |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  WILLIAM POERTNER             +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |CAUDLE JULIAN        R2      |
|10 CFR SECTION:                                 |                             |
|AESF 50.72(b)(2)(ii)     ESF ACTUATION          |                             |
|AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION    |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|                                                   |                          |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| INADVERTENT ESF ACTUATION.                                                   |
|                                                                              |
| During the performance of a scheduled surveillance 2-SR-3.3.5.1.2(ATU        |
| C)/Core and Containment Cooling Systems Analog Trip Unit Functional Test,    |
| Relay 2-RLY-073-23A-K36 was required to have inhibits (boots) installed to   |
| prevent HPCI valves (PCIS GP-4 isolation) from actuating due to a simulated  |
| high steam flow condition.  At 1337 CDT on June 17, 1999, Unit 2 received a  |
| group 4 HPCI isolation during the performance of step 7.15.15 of the         |
| surveillance procedure.  The licensee determined that the wrong contacts had |
| been inhibited allowing the actuation to occur.  The inhibits were removed   |
| and the PCIS GP-4 isolation was reset at 1402 CDT returning HPCI to an       |
| operable condition.                                                          |
|                                                                              |
| The licensee notified the NRC resident inspector.                            |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35839       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PILGRIM                  REGION:  1  |NOTIFICATION DATE: 06/17/1999|
|    UNIT:  [1] [] []                 STATE:  MA |NOTIFICATION TIME: 18:16[EDT]|
|   RXTYPE: [1] GE-3                             |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        16:30[EDT]|
| NRC NOTIFIED BY:  G FIEDLER                    |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  WILLIAM POERTNER             +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JIMI YEROKUN         R1      |
|10 CFR SECTION:                                 |                             |
|AIND 50.72(b)(2)(iii)(D) ACCIDENT MITIGATION    |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1     N          N       0        Refueling        |0        Refueling        |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| THREE OF FOUR MAIN STEAM RELIEF VALVES (MSRV) CONEX CONNECTORS INSTALLED     |
| BACKWARDS.                                                                   |
|                                                                              |
| While shutdown the licensee determined that 3 of 4 MSRV's had the conex      |
| connectors installed backwards.  The connectors provide the environmental    |
| qualification seal to the pilot solenoid valve.  ADS may not have functioned |
| under elevated drywell temperature conditions.                               |
|                                                                              |
| The licensee plans to notify the NRC resident inspector.                     |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35840       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: LASALLE                  REGION:  3  |NOTIFICATION DATE: 06/17/1999|
|    UNIT:  [] [2] []                 STATE:  IL |NOTIFICATION TIME: 21:01[EDT]|
|   RXTYPE: [1] GE-5,[2] GE-5                    |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        17:22[CDT]|
| NRC NOTIFIED BY:  S MARIK                      |LAST UPDATE DATE:  06/17/1999|
|  HQ OPS OFFICER:  WILLIAM POERTNER             +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JOHN MADERA          R3      |
|10 CFR SECTION:                                 |                             |
|AESF 50.72(b)(2)(ii)     ESF ACTUATION          |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|                                                   |                          |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| ESF ACTUATION.                                                               |
|                                                                              |
| At 1722 CDT the 2D primary containment vacuum breaker 2PC001D went from the  |
| closed (normal) position to an indicated dual position.  The valve is        |
| actuated by a differential pressure between the suppression chamber and the  |
| drywell air space and is designed to open at 0.5 psid or less.  Differential |
| pressure at 1722 CDT was 0.23 psid.  An operator was dispatched and the      |
| containment vacuum breaker was manually cycled.  After being manually cycled |
| the containment vacuum breaker returned to the closed position.  The         |
| licensee subsequently satisfactorily performed an operability test on the    |
| containment vacuum breaker.                                                  |
|                                                                              |
| The licensee has notified the NRC resident inspector.                        |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35841       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PALISADES                REGION:  3  |NOTIFICATION DATE: 06/18/1999|
|    UNIT:  [1] [] []                 STATE:  MI |NOTIFICATION TIME: 01:41[EDT]|
|   RXTYPE: [1] CE                               |EVENT DATE:        06/17/1999|
+------------------------------------------------+EVENT TIME:        22:40[EDT]|
| NRC NOTIFIED BY:  BRUCE HOWARD                 |LAST UPDATE DATE:  06/18/1999|
|  HQ OPS OFFICER:  DOUG WEAVER                  +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JOHN MADERA          R3      |
|10 CFR SECTION:                                 |                             |
|NINF                     INFORMATION ONLY       |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| INFORMATION CALL - A FIRE ON OWNER CONTROLLED PROPERTY                       |
|                                                                              |
| A fire of yet undetermined origin was discovered by a janitor at             |
| approximately 2240 hours, Thursday, June 17, in a temporary office trailer,  |
| north of the Palisades Training Building. The trailer complex is located     |
| one-half mile from the operating plant. There was no impact to the Training  |
| Building or the plant's operation, and the plant remained at full power.     |
|                                                                              |
| The control room was notified after discovery of the blaze. The control room |
| dispatched the plant's fire brigade and Covert Fire and Ambulance department |
| to the scene. The plant fire brigade began immediate setup of hoses and      |
| began initial fire fighting until the Covert Fire department arrived, some   |
| 15 minutes later.                                                            |
|                                                                              |
| Cause of the fire has not been determined. An investigation will be          |
| initiated. There were no injuries and no one was in the trailer office at    |
| the time.                                                                    |
|                                                                              |
| A safety inspection will be conducted today of all plant offices and         |
| trailers for potential fire hazards.                                         |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   35842       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: LASALLE                  REGION:  3  |NOTIFICATION DATE: 06/18/1999|
|    UNIT:  [] [2] []                 STATE:  IL |NOTIFICATION TIME: 05:48[EDT]|
|   RXTYPE: [1] GE-5,[2] GE-5                    |EVENT DATE:        06/18/1999|
+------------------------------------------------+EVENT TIME:        02:50[CDT]|
| NRC NOTIFIED BY:  JIM SPIELER                  |LAST UPDATE DATE:  06/18/1999|
|  HQ OPS OFFICER:  DOUG WEAVER                  +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |JOHN MADERA          R3      |
|10 CFR SECTION:                                 |                             |
|AESF 50.72(b)(2)(ii)     ESF ACTUATION          |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|                                                   |                          |
|2     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| ESF ACTUATION - VACUUM BREAKER                                               |
|                                                                              |
| At 0250 CDST 2PC001D, the 2D Primary Containment Vacuum Breaker went from    |
| the (normal) closed position to an indicated dual position.  Locally it was  |
| determined that the valve was just cracked open.  The valve is designed to   |
| open when Suppression chamber pressure is approximately 0.5 psig greater     |
| than Drywell pressure.  When the vacuum breaker opened the aforementioned    |
| differential pressure was approximately 0.2 psid.  The vacuum breaker was    |
| closed by an Equipment Attendant and then cycled per LOS-PC-M2 "Unit 2       |
| Drywell-Suppression Pool Vacuum Breaker Operability Test for Condition 1,2   |
| and 3" to verify proper operation. The valve cycled satisfactorily.          |
|                                                                              |
| The licensee notified the NRC resident inspector.                            |
|                                                                              |
| NOTE:  THIS  IS SIMILAR TO EVENT 35840.                                      |
+------------------------------------------------------------------------------+


Page Last Reviewed/Updated Thursday, March 25, 2021