ML20080M696

Informs That 840111 Notification of Incident Unnecessary in That Only One Train of HPSI Rendered Inoperable

ML20080M696
Person / Time
Site:	San Onofre
Issue date:	02/10/1984
From:	Haynes J SOUTHERN CALIFORNIA EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION (ADM)
References
NUDOCS 8402210244
Download: ML20080M696 (2)

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Southern California Eofison Company ,5CE )

s AN ONOFRE NUCLE A R GENER ATING ST ATION P.O. sox s2s s AN cLEMENTE, c A UFORNI A .2672 J. G. H A YN ES totarnoNa ST ATION M AN AGE A (734)4,2 7700 ,

Fe b rua ry 10, 1984 -

1 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

Docket No. 50-361 Ja nua ry 11, 1984 Immediate Notification San Onofre Nuclear Generating Station, Unit 2 In accordance with 10 CFR 50.72(b)(1)(ii)(B), an immediate notification was made shortly after midnight on the morning of Ja nua ry 11, 1984. That notification reported that Unit 2 was outside its design basis in that both High Pressure Safety Injection (HPSI) trains were ' considered inoperable for approximately twenty-five (25) minutes. Upon further evaluation on January 11, 1984, it was established that the notification was unnecessary in that only one train of HPSI had been rendered inoperable, as permitted by Limiting Condition for Operation (LCO), Action Statement 3.5.2(a), and at no time was Unit 2 in a condition that was outside the design basis.

3 The immeatate notification was originally made by considering the Train "A" HPSI to be inoperable when the Train "A" Diesel was removed from service. Since the Technical Specifications specifically do not require emergency power sources to be operable in order for equipment served by such emergency power sources to be considered operable, Train "A" HPSI should not l

have been ccnsidered inoperable. The Train "A" 1E Bus which provides normal power to Train "A" HPSI remained energized and l offsite power remained available.

~ The incident was reviewed in detail by Station Management on i

January 11, 1984. In addition, our analysis of the occurrence has been discussed with the NRC Resident Inspectcr.

The shif t and staff personnel responsible for making immediate notifications to the NRC have been instructed to err on the conservative side and make a notification, even if there may be some doubt as to the applicability of 10CFR50.72 or the validity of the initial information. In this case, such notification was 8402210244 840210 PDR ADOCK 05000361 S PDR g((

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February 10, 1984 made and subsequently determined to be unnecessary. Consequently, no 10 CFR 50.73, " Licensee Event Report System", report will be made. If you have additional questions or comments regarding this l

event, please contact me.

Sincerely, j , h' W; -

J. G. HA S STATION MANAGER PACroy:2405u:dkd cc: J. Bi Martin (Regional Administrator, Region V)

A. . E.; Chaf fee -(USNRC Resident Inspector, -Units .1, 2 and 3)

J.~P. Stewart (USNRC Resident' Inspector, Units:2-and 3)

U. S. Nuclear Regulatory Commission

. (Officec oftInspectioncand.Enforcements Institute of Nuclear Power Operations (INPO)

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