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Event Notification Report for April 11, 2001

                    U.S. Nuclear Regulatory Commission
                              Operations Center

                              Event Reports For
                           04/10/2001 - 04/11/2001

                              ** EVENT NUMBERS **

37901  37902  37904  37905  37906  37907  

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|Power Reactor                                    |Event Number:   37901       |
+------------------------------------------------------------------------------+
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| FACILITY: BYRON                    REGION:  3  |NOTIFICATION DATE: 04/09/2001|
|    UNIT:  [] [2] []                 STATE:  IL |NOTIFICATION TIME: 06:48[EDT]|
|   RXTYPE: [1] W-4-LP,[2] W-4-LP                |EVENT DATE:        04/09/2001|
+------------------------------------------------+EVENT TIME:        05:07[CDT]|
| NRC NOTIFIED BY:  WILLIAMS/BOOMGARDER          |LAST UPDATE DATE:  04/10/2001|
|  HQ OPS OFFICER:  STEVE SANDIN                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |MICHAEL JORDAN       R3      |
|10 CFR SECTION:                                 |                             |
|*PRE 50.72(b)(2)(xi)     OFFSITE NOTIFICATION   |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|                                                   |                          |
|2     N          N       0        Cold Shutdown    |0        Cold Shutdown    |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
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| PRESS RELEASE PREPARED CONCERNING WORKERS TRANSPORTED TO AREA HOSPITAL AND   |
| PLANNED NOTIFICATION TO THE OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION    |
| (OSHA)                                                                       |
|                                                                              |
| "A news release is planned regarding the following incident:                 |
|                                                                              |
| "At 0304 [CDT] this morning, 13 Contract Individuals working in the 2B Main  |
| Condenser experienced respiratory distress.  The individuals all exited the  |
| condenser under their own power for medical attention.  Seven individuals    |
| were transported offsite to a local area hospital for treatment.  The        |
| remaining 6 are under the care of the onsite medical staff.  An              |
| investigation is ongoing.                                                    |
|                                                                              |
| "Additional information:  At the current time, the Byron site is preparing   |
| information to be made available to the media upon request."                 |
|                                                                              |
| The licensee informed the NRC resident inspector.                            |
|                                                                              |
| ***** UPDATE RECEIVED AT 1313 EDT ON 04/09/01 FROM SCOT SWANSON TO LEIGH     |
| TROCINE *****                                                                |
|                                                                              |
| The following text is a portion of a facsimile received from the licensee:   |
|                                                                              |
| "[...]  The Byron Site Vice President arranged for a meeting with the local  |
| media to present available information and answer questions.  Exelon         |
| Corporation is arranging the press release.  In summary:"                    |
|                                                                              |
| "Exelon Byron Station had an incident at 0304 [CDT] on 04/09/01 that         |
| involved 13 individuals supporting the Unit 2 outage.  They were working in  |
| the Unit 2 Main Condenser and had to leave due to respiratory distress.  Of  |
| the 7 that were transported to local Rockford Memorial hospital, 4 have been |
| admitted for observation.  [...]"                                            |
|                                                                              |
| "This is reportable to OSHA under 29 CFR 1904.8."                            |
|                                                                              |
| The licensee stated that four individuals were admitted to the hospital for  |
| observation at 0830 CDT.  Therefore, the required 8-hour notification to     |
| OSHA is due by 1630 CDT.                                                     |
|                                                                              |
| The licensee also stated that Unit 2 is presently in Mode 6 (Refueling).     |
| Mode 6 was entered at 0938 CDT on 04/09/01.                                  |
|                                                                              |
| The licensee plans to notify the NRC resident inspector and OSHA.  A press   |
| release has been made.  The NRC operations officer notified the R3DO         |
| (Geoffrey Wright).                                                           |
|                                                                              |
| Call the NRC Operations Center for a licensee point of contact.              |
|                                                                              |
| ***** UPDATE RECEIVED AT 1637 EDT ON 04/10/01 FROM STEVE GODBY TO LEIGH      |
| TROCINE *****                                                                |
|                                                                              |
| The following text is a portion of a press release that was received from    |
| the licensee via facsimile:                                                  |
|                                                                              |
| "[...] - All seven contract workers from Byron Generating Station            |
| transported to Rockford Memorial Hospital Monday morning have been           |
| released."                                                                   |
|                                                                              |
| "The workers had been building scaffolds inside the Unit 2 condenser as part |
| of a refueling outage that started over the weekend.  Shortly after 3:00     |
| a.m. [CDT], an oxygen monitor worn by a member of the team alarmed.  The     |
| employees immediately left the area according to plant procedures."          |
|                                                                              |
| "The seven employees were transported to the hospital after complaining of   |
| dizziness and trouble breathing.  Three were quickly released Monday, and    |
| the other four were admitted for observation and released by 8:30 p.m. [CDT] |
| Monday night."                                                               |
|                                                                              |
| "An investigation showed that fumes from an anti-corrosive agent in piping   |
| connected to the condenser had flowed into the condenser, causing the        |
| symptoms"                                                                    |
|                                                                              |
| "The pipes have been vented and drained to remove the residual fumes.  There |
| are no other sources of chemicals that would affect the air quality inside   |
| the condenser."                                                              |
|                                                                              |
| "The work area has been determined to be safe.  It remains well ventilated,  |
| and monitoring equipment will continue to verify safe atmospheric conditions |
| in the condenser."                                                           |
|                                                                              |
| The licensee notified the NRC resident inspector, OSHA, and the media.  The  |
| NRC operations officer notified the R3DO (Geoffrey Wright).                  |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   37902       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: CRYSTAL RIVER            REGION:  2  |NOTIFICATION DATE: 04/09/2001|
|    UNIT:  [3] [] []                 STATE:  FL |NOTIFICATION TIME: 11:08[EDT]|
|   RXTYPE: [3] B&W-L-LP                         |EVENT DATE:        04/09/2001|
+------------------------------------------------+EVENT TIME:        09:54[EDT]|
| NRC NOTIFIED BY:  RICHARD SWEENEY              |LAST UPDATE DATE:  04/10/2001|
|  HQ OPS OFFICER:  STEVE SANDIN                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |CAUDLE JULIAN        R2      |
|10 CFR SECTION:                                 |                             |
|*PRE 50.72(b)(2)(xi)     OFFSITE NOTIFICATION   |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|3     N          Y       100      Power Operation  |100      Power Operation  |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| OFFSITE NOTIFICATION TO NATIONAL MARINE AND FISHERIES SERVICE REGARDING A    |
| LOGGERHEAD SEA TURTLE                                                        |
|                                                                              |
| "On April 09, 2001 at 0940 the 40th non-lethal sea turtle take in the        |
| biennial period occurred.                                                    |
|                                                                              |
| "In accordance with Crystal River Unit #3 Operating License, Appendix B,     |
| Environmental Protection Plan (Non-Radiological),  'Endangered or threatened |
| sea turtles shall be protected in accordance with the Incidental Take        |
| Statement issued by the National Marine and Fisheries Service (NMFS).'  The  |
| NMFS has established numerical limits on live takes, lethal takes causally   |
| related to plant operation, and lethal takes not related to plant            |
| operations.                                                                  |
|                                                                              |
| "The NMFS must be notified within five days whenever:                        |
|                                                                              |
| a.  The 40th non-lethal take occurs in the biennial period, or               |
| b.  The third causally related mortality occurs in the biennial period, or   |
| c.   The sixth non-causally related mortality occurs in the biennial         |
| period.                                                                      |
|                                                                              |
| "The current biennial period for monitoring sea turtle takes began January   |
| 1, 2001.                                                                     |
|                                                                              |
| "Thus, in accordance with Crystal Unit #3 Administrative Instruction 571,    |
| Sea Turtle Rescue and Handling Guidance, the NMFS must be notified within    |
| five days.                                                                   |
|                                                                              |
| "In accordance with Crystal River Unit #3 Compliance Procedure 151, External |
| Reporting Requirements, this 40th non-lethal sea turtle take is Reportable   |
| as a 4-Hour Report under 10 CFR 50.72(b)(2)(xi) as this event is related to  |
| the protection of the environment for which a notification to other          |
| government agencies has been or will be made."                               |
|                                                                              |
| The licensee will inform the NRC resident inspector.                         |
|                                                                              |
| * * * UPDATE 0944EDT ON 4/10/01 FROM R. SWEENEY TO S. SANDIN * * *           |
|                                                                              |
| "On April 10, 2001 at 0859 the 41st non-lethal sea turtle take in the        |
| biennial period occurred."                                                   |
|                                                                              |
| The licensee informed the NRC resident inspector.  Notified R2DO(Julian).    |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|General Information or Other                     |Event Number:   37904       |
+------------------------------------------------------------------------------+
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| REP ORG:  MARYLAND DEPT OF THE ENVIRONMENT     |NOTIFICATION DATE: 04/10/2001|
|LICENSEE:  CAMPBELL & NOLAN ASSOCIATES          |NOTIFICATION TIME: 08:38[EDT]|
|    CITY:  FALLSTON                 REGION:  1  |EVENT DATE:        04/09/2001|
|  COUNTY:  HARFORD                   STATE:  MD |EVENT TIME:             [EDT]|
|LICENSE#:  MD-25-030-01          AGREEMENT:  Y  |LAST UPDATE DATE:  04/10/2001|
|  DOCKET:                                       |+----------------------------+
|                                                |PERSON          ORGANIZATION |
|                                                |JAMES LINVILLE       R1      |
|                                                |DON COOL             NMSS    |
+------------------------------------------------+                             |
| NRC NOTIFIED BY:  ALAN JACOBSON                |                             |
|  HQ OPS OFFICER:  STEVE SANDIN                 |                             |
+------------------------------------------------+                             |
|EMERGENCY CLASS:          N/A                   |                             |
|10 CFR SECTION:                                 |                             |
|NAGR                     AGREEMENT STATE        |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+------------------------------------------------------------------------------+

                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| AGREEMENT STATE REPORT INVOLVING A LOST TROXLER MOISTURE DENSITY GAUGE       |
|                                                                              |
| "Baltimore, MD (April 9,2001)-The Maryland Department of the Environment     |
| (MDE) has received a report that a moisture density gauge containing nuclear |
| material is missing from a contractor in Fallston, Harford County, Maryland. |
| Engineering consultants Campbell and Nolan Associates, Inc. reported that    |
| the device apparently fell from the back of a pick-up truck as it was        |
| leaving a construction site in Harford County on the morning of April 9,     |
| 2001.                                                                        |
|                                                                              |
| "The gauge is believed to have been lost between Monmouth Meadows on Singer  |
| Road and the offices of Campbell and Nolan Associates located at 2813 Bel    |
| Air Road in Fallston, Maryland.                                              |
|                                                                              |
| "The portable device is used to measure the moisture and density of soil.    |
| The gauge, a Troxler, model 3430 [S/N 26218], is yellow in color and         |
| approximately 3' X 2' X 2'. The device contains radioactive material         |
| identified as Cesium-137 on an extendable rod and Americium-241 encased in   |
| the device. Campbell and Nolan personnel reported that the device was        |
| secured with a padlock to prevent inadvertent exposure of the radioactive    |
| source. The radioactive material is not a threat to public health and safety |
| as long as it remains intact within the device's shielded enclosure."        |
|                                                                              |
| Call the Operations Center for contact information.                          |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   37905       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: ROBINSON                 REGION:  2  |NOTIFICATION DATE: 04/10/2001|
|    UNIT:  [2] [] []                 STATE:  SC |NOTIFICATION TIME: 18:49[EDT]|
|   RXTYPE: [2] W-3-LP                           |EVENT DATE:        04/10/2001|
+------------------------------------------------+EVENT TIME:        13:30[EDT]|
| NRC NOTIFIED BY:  HAROLD CHERNOFF              |LAST UPDATE DATE:  04/10/2001|
|  HQ OPS OFFICER:  LEIGH TROCINE                +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |MIKE ERNSTES         R2      |
|10 CFR SECTION:                                 |                             |
|*DEG 50.72(b)(3)(ii)(A)  DEGRAD COND DURING OP  |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR|   INIT RX MODE  |CURR PWR|  CURR RX MODE   |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|2     N          N       0        Cold Shutdown    |0        Cold Shutdown    |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| DISCOVERY OF REACTOR COOLANT SYSTEM PRESSURE BOUNDARY LEAKAGE POSSIBLY VIA A |
| CONTROL ROD DRIVE MECHANISM ASSEMBLY SEAL WELD                               |
|                                                                              |
| The following text is a portion of a facsimile received from the licensee:   |
|                                                                              |
| "On 4/10/01, during the removal of mirror insulation from the reactor vessel |
| head while shut down, deposits of residual boric acid were found on the      |
| periphery of the Reactor Pressure Vessel Head outside of the Control Rod     |
| Drive Mechanism (CRDM) Shroud.  Subsequent investigation, by visual          |
| inspection of the area within the shroud, revealed additional amounts of     |
| boric acid.  The source of the leak, based on initial observation, appears   |
| to be a CRDM assembly seal-weld leak about 18 inches above the vessel head   |
| insulation.  A leak from this location would constitute Reactor Coolant      |
| System Pressure Boundary leakage.  Initial inspection of the reactor vessel  |
| head areas, in the vicinity of the boric acid deposits outside of the        |
| shroud, revealed no damage to the reactor vessel head."                      |
|                                                                              |
| The licensee notified the NRC resident inspector.                            |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Fuel Cycle Facility                              |Event Number:   37906       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: PADUCAH GASEOUS DIFFUSION PLANT      |NOTIFICATION DATE: 04/10/2001|
|   RXTYPE: URANIUM ENRICHMENT FACILITY          |NOTIFICATION TIME: 23:55[EDT]|
| COMMENTS: 2 DEMOCRACY CENTER                   |EVENT DATE:        04/06/2001|
|           6903 ROCKLEDGE DRIVE                 |EVENT TIME:        22:30[CDT]|
|           BETHESDA, MD 20817    (301)564-3200  |LAST UPDATE DATE:  04/10/2001|
|    CITY:  PADUCAH                  REGION:  3  +-----------------------------+
|  COUNTY:  McCRACKEN                 STATE:  KY |PERSON          ORGANIZATION |
|LICENSE#:  GDP-1                 AGREEMENT:  Y  |GEOFFREY WRIGHT      R3      |
|  DOCKET:  0707001                              |ERIC LEEDS           NMSS    |
+------------------------------------------------+                             |
| NRC NOTIFIED BY:  J. M. UNDERWOOD              |                             |
|  HQ OPS OFFICER:  FANGIE JONES                 |                             |
+------------------------------------------------+                             |
|EMERGENCY CLASS:          N/A                   |                             |
|10 CFR SECTION:                                 |                             |
|NBNL                     RESPONSE-BULLETIN      |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
|                                                |                             |
+------------------------------------------------------------------------------+

                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| NRC BULLETIN 91-01 24 HOUR REPORT                                            |
|                                                                              |
| The following is from a faxed report:                                        |
|                                                                              |
| On 4/6/01, R-114 evacuation from C-337 Unit 1 Cell 8 was performed as a      |
| non-fissile operation without independent verification documentation that    |
| the cell was less than 1.0 wt. % U235 in violation of NCSA CAS.011. Since    |
| documentation to determine the assay was not reviewed prior to removing the  |
| R-114 vapor pressure, an NCS administrative requirement was not met.         |
|                                                                              |
| SAFETY SIGNIFICANCE OF EVENTS:                                               |
| Double contingency was not maintained. Although the required documentation   |
| was not verified at the time tile R-114 vapor pressure was removed from the  |
| cell, the assay of the cell was well known through historical process        |
| knowledge. Upon discovery, the historical cascade gradient was reviewed and  |
| it was determined that the cell was less than 1.0 wt. %  U235.               |
|                                                                              |
| POTENTIAL CRITICALITY PATHWAYS INVOLVED (BRIEF SCENARIO(S) OF HOW            |
| CRITICALITY COULD OCCUR:                                                     |
| In order for criticality to be possible, the shutdown cell would need to     |
| have an unsafe mass of moderated uranium with an enrichment greater than 1.0 |
| wt. % U235.                                                                  |
|                                                                              |
| CONTROLLED PARAMETERS (MASS, MODERATION. GEOMETRY, CONCENTRATION, ETC.):     |
| Double contingency for this scenario is established by implementing two      |
| controls on assay.                                                           |
|                                                                              |
| ESTIMATED AMOUNT, ENRICHMENT, FORM OF LICENSED MATERIAL (INCLUDE PROCESS     |
| LIMIT AND % WORST CASE CRITICAL MASS):                                       |
| 0.7183 wt. % U235                                                            |
|                                                                              |
| NUCLEAR CRITICALITY SAFETY CONTROL(S) OR CONTROL SYSTEM(S) AND DESCRIPTION   |
| OF THE FAILURES OR DEFICIENCIES:                                             |
| The first leg of double contingency is based on verification that the        |
| equipment contains uranium enriched to less than 1.0 wt. %. The verification |
| of assay was not performed. Therefore, the control was violated and the      |
| first leg of double contingency was lost.                                    |
|                                                                              |
| The second leg of double contingency is based on independent verification    |
| that the equipment contains uranium enriched to less than 1.0 wt. % U235.    |
| This independent verification was not performed. Therefore, the control was  |
| violated and the second leg of double contingency was lost.                  |
|                                                                              |
| Since double contingency is based on two controls on assay, double           |
| contingency was not maintained.                                              |
|                                                                              |
| CORRECTIVE ACTIONS TO RESTORE SAFETY SYSTEMS AND WHEN EACH WAS IMPLEMENTED:  |
|                                                                              |
| An independent assay verification was performed and documented, which        |
| indicated that the assay was less than 1.0 wt. % U235.                       |
|                                                                              |
| Crew briefings have been held to remind them of the requirements of the      |
| NCSA.                                                                        |
|                                                                              |
| The licensee notified the NRC Resident Inspector and intends to notify the   |
| DOE representative.                                                          |
+------------------------------------------------------------------------------+

+------------------------------------------------------------------------------+
|Power Reactor                                    |Event Number:   37907       |
+------------------------------------------------------------------------------+
+------------------------------------------------------------------------------+
| FACILITY: CALLAWAY                 REGION:  4  |NOTIFICATION DATE: 04/11/2001|
|    UNIT:  [1] [] []                 STATE:  MO |NOTIFICATION TIME: 05:55[EDT]|
|   RXTYPE: [1] W-4-LP                           |EVENT DATE:        04/10/2001|
+------------------------------------------------+EVENT TIME:        19:50[CDT]|
| NRC NOTIFIED BY:  SCOT MAGLIO                  |LAST UPDATE DATE:  04/11/2001|
|  HQ OPS OFFICER:  FANGIE JONES                 +-----------------------------+
+------------------------------------------------+PERSON          ORGANIZATION |
|EMERGENCY CLASS:          N/A                   |MARK SHAFFER         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          N       0        Cold Shutdown    |0        Cold Shutdown    |
|                                                   |                          |
|                                                   |                          |
+------------------------------------------------------------------------------+
                                   EVENT TEXT                                   
+------------------------------------------------------------------------------+
| SECURITY REPORT                                                              |
|                                                                              |
| Safeguards system degradation related to monitoring.  Immediate compensatory |
| measures taken upon discovery.                                               |
|                                                                              |
| The licensee intends to notify the NRC Resident Inspector.                   |
|                                                                              |
| Refer to the HOO Log for additional details.                                 |
+------------------------------------------------------------------------------+