Event Notification Report for April 27, 2001
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
04/26/2001 - 04/27/2001
** EVENT NUMBERS **
37823 37945 37946 37947
!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!!
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|Power Reactor |Event Number: 37823 |
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| FACILITY: MONTICELLO REGION: 3 |NOTIFICATION DATE: 03/10/2001|
| UNIT: [1] [] [] STATE: MN |NOTIFICATION TIME: 18:59[EST]|
| RXTYPE: [1] GE-3 |EVENT DATE: 03/10/2001|
+------------------------------------------------+EVENT TIME: 17:05[CST]|
| NRC NOTIFIED BY: P DECKER |LAST UPDATE DATE: 04/26/2001|
| HQ OPS OFFICER: JOHN MacKINNON +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |JOHN MADERA R3 |
|10 CFR SECTION: | |
|*UNA 50.72(b)(3)(ii)(B) UNANALYZED COND OP | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N N 0 Cold Shutdown |0 Cold Shutdown |
| | |
| | |
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EVENT TEXT
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| DIFFERENTIAL PRESSURE TO OPEN THE SUPPRESSION CHAMBER TO DRYWELL VACUUM |
| BREAKERS DISCREPANCIES WERE IDENTIFIED. |
| |
| During review of Inservice Testing requirements, while the plant was in |
| shutdown, discrepancies were identified with acceptance criteria for the |
| torque values used to determine the equivalent differential pressure to open |
| the suppression chamber to drywell vacuum breakers. The measured torque |
| values indicate that the differential pressure required to fully open the |
| suppression chamber to drywell vacuum breakers would be greater than that |
| assumed in containment analyses. The suppression chamber to drywell vacuum |
| breakers insure that the 2 psig external design pressure for the primary |
| containment drywell suppression chamber and vent system is not exceeded and |
| containment integrity is assured. |
| |
| The NRC Resident Inspector will be notified of this event by the licensee. |
| |
| * * * RETRACTION ON 04/23/01 AT 1805ET BY JIM MCKAY TAKEN BY MACKINNON * * |
| * |
| |
| Retraction of notification made on March 10, 2001. The notification stated |
| that discrepancies were identified with acceptance criteria for the torque |
| values used to determine the equivalent differential pressure to open the |
| suppression chamber to drywell vacuum breakers. The measured values |
| indicated a greater differential pressure required to fully open then |
| assumed in containment analysis. Upon further evaluation and review of the |
| containment analyses, the results of the containment analysis were |
| effectively independent and not adversely impacted by the suppression |
| [chamber to drywell vacuum breaker full open differential pressure |
| assumption in the range of concern. Therefore, an unanalyzed condition that |
| significantly degrades the plant safety did not exist.] |
| |
| R3DO (Tom Kozak) has been notified. |
| |
| NRC Resident Inspector will notified of this retraction by the licensee |
| |
| * * * UPDATE 1000EDT ON 4/26/01 TO S. SANDIN * * * |
| |
| The above retraction was updated to include information shown in brackets |
| which had been submitted but inadvertently omitted from the report. |
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|Other Nuclear Material |Event Number: 37945 |
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| REP ORG: CROWE BUTTE RESOURCES |NOTIFICATION DATE: 04/26/2001|
|LICENSEE: CROWE BUTTE RESOURCES |NOTIFICATION TIME: 15:29[EDT]|
| CITY: CRAWFORD REGION: 4 |EVENT DATE: 04/26/2001|
| COUNTY: STATE: NE |EVENT TIME: 11:30[CDT]|
|LICENSE#: SUA-1534 AGREEMENT: Y |LAST UPDATE DATE: 04/26/2001|
| DOCKET: |+----------------------------+
| |PERSON ORGANIZATION |
| |BILL JONES R4 |
| |JOHN HICKEY NMSS |
+------------------------------------------------+ |
| NRC NOTIFIED BY: MIKE GRIFFIN | |
| HQ OPS OFFICER: DOUG WEAVER | |
+------------------------------------------------+ |
|EMERGENCY CLASS: N/A | |
|10 CFR SECTION: | |
|NMIN MINING EVENT | |
| | |
| | |
| | |
| | |
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EVENT TEXT
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| LEAK IN BRINE POND LINER |
| |
| The licensee has confirmed a leak in the pond liner based on an increase in |
| the conductivity of the water between the inner and outer liners (the leak |
| is in the inner liner). No release to the environment has occurred. |
| The licensee believes the leak is small based on the increase in |
| conductivity with only a small accompanying increase in water level in the |
| area between the liners. |
| |
| The licensee will pump down the pond and attempt to find and repair the |
| leak. This could take one to two weeks. |
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|Other Nuclear Material |Event Number: 37946 |
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| REP ORG: DELAWARE EMERG MANAGEMENT AGENCY |NOTIFICATION DATE: 04/26/2001|
|LICENSEE: UNKNOWN |NOTIFICATION TIME: 17:36[EDT]|
| CITY: NEW CASTLE REGION: 1 |EVENT DATE: 04/26/2001|
| COUNTY: STATE: DE |EVENT TIME: [EDT]|
|LICENSE#: AGREEMENT: N |LAST UPDATE DATE: 04/26/2001|
| DOCKET: |+----------------------------+
| |PERSON ORGANIZATION |
| |DAVID SILK R1 |
| |JOSIE PICCONE NMSS |
+------------------------------------------------+RICHARD WESSMAN IRO |
| NRC NOTIFIED BY: DAVID HAKE | |
| HQ OPS OFFICER: DOUG WEAVER | |
+------------------------------------------------+ |
|EMERGENCY CLASS: N/A | |
|10 CFR SECTION: | |
|NINF INFORMATION ONLY | |
| | |
| | |
| | |
| | |
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EVENT TEXT
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| RECOVERY OF TROXLER GAUGE |
| |
| The Delaware Emergency Management Agency (DEMA) reported the recovery of |
| what appears to be a Troxler moisture density gauge. The gauge was |
| recovered in New Castle, DE just off of I-95. The gauge appears to be |
| intact with the source in the shielded position. No model or serial numbers |
| were available. DEMA requested NRC assistance to remove the gauge. The |
| gauge is isolated pending resolution. |
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|Power Reactor |Event Number: 37947 |
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| FACILITY: COOPER REGION: 4 |NOTIFICATION DATE: 04/26/2001|
| UNIT: [1] [] [] STATE: NE |NOTIFICATION TIME: 22:26[EDT]|
| RXTYPE: [1] GE-4 |EVENT DATE: 04/26/2001|
+------------------------------------------------+EVENT TIME: 17:45[CDT]|
| NRC NOTIFIED BY: ANDREW OHRABLO |LAST UPDATE DATE: 04/26/2001|
| HQ OPS OFFICER: DOUG WEAVER +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: N/A |BILL JONES R4 |
|10 CFR SECTION: | |
|*IND 50.72(b)(3)(v)(D) ACCIDENT MITIGATION | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|UNIT |SCRAM CODE|RX CRIT|INIT PWR| INIT RX MODE |CURR PWR| CURR RX MODE |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|1 N Y 100 Power Operation |100 Power Operation |
| | |
| | |
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EVENT TEXT
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| CONTROL ROOM EMERGENCY FILTRATION SYSTEM (CREFS) INOPERABLE |
| |
| The licensee entered a 7 day LCO when high vibrations were noticed on the |
| booster fan. The fan was declared inoperable and led to CREFS being |
| declared inoperable since it is a single train system. Licensee intends to |
| repair the system prior to expiration of the LCO. |
| |
| The licensee notified the NRC resident inspector. |
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Page Last Reviewed/Updated Thursday, March 25, 2021