Event Notification Report for April 25, 2002
U.S. Nuclear Regulatory Commission
Operations Center
Event Reports For
04/24/2002 - 04/25/2002
** EVENT NUMBERS **
38761
!!!!!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!!
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|Power Reactor |Event Number: 38761 |
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| FACILITY: VOGTLE REGION: 2 |NOTIFICATION DATE: 03/12/2002|
| UNIT: [1] [] [] STATE: GA |NOTIFICATION TIME: 14:50[EST]|
| RXTYPE: [1] W-4-LP,[2] W-4-LP |EVENT DATE: 03/12/2002|
+------------------------------------------------+EVENT TIME: 08:30[EST]|
| NRC NOTIFIED BY: CECIL WILLIAMS |LAST UPDATE DATE: 04/24/2002|
| HQ OPS OFFICER: GERRY WAIG +-----------------------------+
+------------------------------------------------+PERSON ORGANIZATION |
|EMERGENCY CLASS: NON EMERGENCY |MARK LESSER R2 |
|10 CFR SECTION: | |
|AUNA 50.72(b)(3)(ii)(B) UNANALYZED CONDITION | |
| | |
| | |
| | |
+-----+----------+-------+--------+-----------------+--------+-----------------+
|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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| UNANALYZED CONDITION - SI MINIFLOW LINE VALVE INTERLOCK MIS-WIRED |
| |
| "In the analysis for certain design bases accidents, credit is taken for a |
| recirculation mode of operation that ensures continued cooling to the |
| reactor core following an injection mode. During the current Unit 1 |
| refueling outage, it was found that a safety injection (SI) miniflow line |
| valve (1HV-8813) interlock was mis-wired. The interlock wiring should have |
| allowed a second valve (1HV-8804B) to be opened during switchover from |
| injection mode to recirculation mode once 1HV-8813 has been closed but would |
| not. This wiring error was subsequently corrected. 1HV-8804B is opened to |
| provide a suction source from the discharge of the Train B residual heat |
| removal (RHR) pump to the suction of the SI pumps. 1HV-8804B must open for |
| recirculation to begin if the opposite train is unavailable. A review has |
| found that this mis-wiring has existed since at least 1996. |
| |
| "Based on preliminary evaluation, on 3-12-2002, at 0830 EST, we concluded |
| that this may represent an unanalyzed condition that significantly degrades |
| plant safety and is reportable per 10 CFR 50.72 (b)(3)(ii)(B). Further |
| evaluation is being performed to determine the significance of the |
| mis-wiring." |
| |
| The NRC Resident was notified by the licensee. |
| |
| ***** RETRACTION FROM JOHN WILLIAMS TO LEIGH TROCINE AT 1047 EDT ON 04/25/02
|
| ***** |
| |
| The following text is a portion of a facsimile received from the licensee: |
| |
| "RETRACTION - Further review of the event reported on 03/12/02 via |
| Notification #38761, and described [above], has concluded that it is not a |
| condition that significantly degrades plant safety. It is hereby |
| retracted." |
| |
| The licensee notified the NRC resident inspector and plans to make a 60-day |
| report. The NRC operations officer notified the R2DO (Ann Boland). |
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