ML20210D658

Confirms Discussions Re Cold Shutdown from Control Room. Cooper Statement That Cold Shutdown Possible W/O Operator Actions Outside Control Room Based on Erroneous Statement in Sser 7

ML20210D658
Person / Time
Site:	Diablo Canyon
Issue date:	02/01/1984
From:	Crews J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:	Knighton G Office of Nuclear Reactor Regulation
Shared Package
ML20210D653	List: ML20210D649 ML20210D658 ML20210D663 ML20210D675 ML20210D700 ML20210D709 ML20210D716 ML20210D726 ML20210D749
References
FOIA-86-197 NUDOCS 8609190291
Download: ML20210D658 (1)

Text

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f o i G r.K tu.MORANDi>i FOR: George Knighton, Bran;h Chiet, Office of Nuclear Raactor Regulation FP0M: J. L. Crews, Sanice Reactor Encincer

1. UBJECT:

ACHIEVING COLD SHUTDOWN FROM lHE CONrROL ROOM - DIABLO CANYON This is to conf'tT,i bur disc %sion over the past several weekt regarding the obove tubject.

in a dictussion with Mr. Ccoper, a fonner employte of Pacific 6 S & Electirc Cc . ,

he incicated th-t he had learnad frcm otr,er: that. PG&E had stated that the Diallo Canyon pLnt could be brought to cold shutdcrin from the centrol room withnut th; naed for operator actions cetside the control room. Afte.r furtM r ditcussion with Mr. Cooper, $t was oetermined that t',e was referring to a Mscussion in Supplement No. 7 to the staff's SER (SSEit No. 7).

Specifically, Nr Cooper pointed cut the following stotenent on page 3.3 of SSER tio. 7, "all of the operator actions needed to perf or7;' plant c>ld snutdo.in (except fer periedic curveillence of the Scron cor. centration) ccn be accc.nplishad from the control raur., assuming no s# 1gle failure".

Contrary to this statement, o;eratot actior:s wuld be neces:ary to rock in the piping.

leg electricel breakers for thL .9HR section 1sniaticn valves from the het As e agreed in our discussions on the subject, it appurs the flPP .staf f should consider thl:, inforTaation and the extert to which it raay change any conclusions in the staff's sed.

We plan no fur ther action 01 this subject in Reoion V. Should ycu or your staff have questions, please give me a cell.

f. '& W J . l. . ews Sandor , eactor Erejincer cc: T. Bishap D. l(irsch M. Menicaca /)

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