05000312/LER-1986-016, Errata to LER 86-016-02:on 861003,decay Heat Sys Pump B Tripped Due to Abnormal Indication on Panel H2SFB Causing Bistable B Trip & HV-20002 to Close.Caused by Arc in Sump Level Indicator.Indicators Will Be Repainted

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Errata to LER 86-016-02:on 861003,decay Heat Sys Pump B Tripped Due to Abnormal Indication on Panel H2SFB Causing Bistable B Trip & HV-20002 to Close.Caused by Arc in Sump Level Indicator.Indicators Will Be Repainted
ML20236T377
Person / Time
Site: Rancho Seco
Issue date: 11/18/1987
From: Lavely P
SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:
Shared Package
ML20236T357 List:
References
LER-86-016-ERR, LER-86-16-ERR, NUDOCS 8712010194
Download: ML20236T377 (1)
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LER-2086-016, Errata to LER 86-016-02:on 861003,decay Heat Sys Pump B Tripped Due to Abnormal Indication on Panel H2SFB Causing Bistable B Trip & HV-20002 to Close.Caused by Arc in Sump Level Indicator.Indicators Will Be Repainted
Event date:
Report date:
3122086016R00 - NRC Website
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C perm 364 U.S. NUCLESQ REGULQTORY COMMISSION APPROVED OMB NO 31 0 0104 EXPIRES B 31 M LICENSEE EVENT REPORT (LER) 4 FOCILITV NAME 111 DOCKET NUMSE R (21 _

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Rancho Seco Nuclear Generating Station o l5 lo to loi } l i Z iloq v i a TITLE les Decay Heat System Trip Following an Arc in a Sump Level Indicator EVENT DAT5 I6I LER NUMBER t6i REPORT DATE (71 OTHER f ACILITIES INVOLVED (S)

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Hhile in Cold Shutdown on October 3,1986, during Instrument &' Control investigation of abnormal indication on panel H2SFB for Decay Heat System (DHS)

"B" Room sump stack lights, SFAS "B" bistables tripped causing HV-20002 to close, which tripped DHS "B" Pump. The plant was without the use of the normal DHS for approximately 13 minutes. Due to the extended period that the plant has been shutdown, there was a small, but detectable increase of reactor coolant temperature. Steps were taken immediately to restore a DHS train to service in accordance with the intent of Technical Specification 3.1.1.5. This event is reportable according to 10 CFR Part 50.73(a)(2)(iv & v).

The immediate cause of the incident was an arc that occurred when I&C technicians were troubleshooting an abnormal indication on panel H2SFB for DHS "B" Pump Room Mast) Sump stack lights (18 inch level indication). The arc initiated the trip

( f inverter 'lB". De paint on the lens retaining clip of the indicator had r cSterborated. and the metal of the clip provided a path to ground, e

l [As conectist actions, the1 1 ens clips for the indicators installed in the Plant vill te repainted or replaced by Februitry 28, 1988. Additionally, this event will be,includediln ongoing oprrator training. As a long term corrective action, the DC ,1tal power supplies will be modified to be equipped with static transfer switches.

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