ML20032D735
| ML20032D735 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 11/06/1981 |
| From: | GEORGIA POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| RO-50-321-1981, NUDOCS 8111170435 | |
| Download: ML20032D735 (1) | |
Text
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IMI'IED STATBS NLCmAR RBITUGULY OMf1SSIDHr DIRECTER OF IN5Pmn(NcAND ENFORCIMNT REGION II StTITf! 31(Ki 101 MARIIIITA STRAT ATi>&A, GREGIA 30303 Str1TBCT: Hatch linit 1,
Docket No.
50-321',
Notificatim Occurrence No. 50-321/3981-120.
IDTIFIED:
J. Bryant
,[- f DKni:.11-06-81 DATE: 11-05-81 NOV161981w ij!
TIME: 1655 BW c,
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Unit'T was stetdoim for.~ core reconst.i tuti on.
lbit 2 shutdan fo Twin { a reactor scra::: m 11-5-81.
Nature of Occurrence A/E review of scram discharge system pipe break implicatims revealtxl t)mt either a scram discharge pipe break m the 1305 elev. or a main steam lina.
l hreak in the steam chase could clevate the torus room temperature sufficimtly to cause a HPCI/RCIC steam line isolation Irredlate Correct.ive Attion A sthnding order 16s been issmd outlining the proper. operator respcnse to over-ride a HPCI/RCIC isolatim due to a main steam lire break.
Cause Wcause is a structural me in that venting of the. steam chase area to the forus rom was required to prevent pressurization of the steam chase area.
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Stpp1mmtal Corrective Actica
'D M A/E is presently ediTtisting a logic change which wuld crier-ride the HPCI/RCIC isolation frcrn High Torus area tecperature in the event of a main s?eam line break.
i Status of Redmulant. cxr Backtp Systems Tnis prohlm (bcs not impact operation of any other liCCS system nor any non-ta:perature related isolation capability of HPCI or RCIC.
1 Impact to Other linit nait 2 is aff6cted the sace as 1) nit 1. h!gg5g T9 3-i 3
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Justificatim for Cmtinued Operation 6
With the concurrence ~ of our 1RR Pro. ject Manager and the resitkmt inspector a 3
standing order has been issue:1 addressing proper. operator response in the event of a confined main steam line break.
Annunciator response procedures
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will also be revised to properly address this problet totil' a permanent modificatim is identifial and implorented.
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