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 THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!!! +------------------------------------------------------------------------------+ |Power Reactor |Event Number: 38761 | +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ +------------------------------------------------------------------------------+ | 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 | | | | | | | +------------------------------------------------------------------------------+ EVENT TEXT +------------------------------------------------------------------------------+ | 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). | +------------------------------------------------------------------------------+
Page Last Reviewed/Updated Thursday, March 25, 2021
Page Last Reviewed/Updated Thursday, March 25, 2021