ML20137D562

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Requests Assistance in Seismic Reevaluation for Facilities. Effort Should Focus on Actions to Bring Plants to Hot Standby & Then Cold Shutdown in Event of Sse.W/O Stated Encl
ML20137D562
Person / Time
Site: Davis Besse, North Anna, Diablo Canyon, 05000000
Issue date: 04/22/1977
From: Knight J
Office of Nuclear Reactor Regulation
To: Ross D, Tedsco R
Office of Nuclear Reactor Regulation
Shared Package
ML20136A555 List: ... further results
References
FOIA-85-363 NUDOCS 8508220515
Download: ML20137D562 (4)
v • d • e


Text

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i April 22, 1977 '

1 W{n R. Tesdsco, Assistant Director (

MEMORAMDUM I'00 Ior Plant Syaeens, *'S $ . w D. Ross, ,ssistant Director '

for Reactor Safaty,

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J. P. F.n i gh t , Assistaat Director - 0 TROM: for Engineerin:, DSS i f

SUBJECT:

TCISMIC RE '2V ALU50ATIO!': -338, JWS NORT2 4 M~ ANNA. DAVIS-3ISSr.'f, ..

AllD DIA51.0 C A!IT O S

.'.n na Un i t s !!o . I and 2 and Davi s-  ?'l The ACRS letters tus ;;c r thdiscovery of the Lloscri fault "

Bessa Unic No. 1 and the sear Diablo Canyon Units No. 1 and 2 have lead to a acionic ,[

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re-evaluation for each of encse facilities. speak to '$

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lhe ACKS letters written on North Anna and Davis-3esseaccouplish

  • f a detailed review of those systens necessary to renoval". '! e

" safe shutdown and continued shutdovn heat initial phase of $.),

plan to use a consistent approach for the l.*

the Diablo Canyon evaluation. ,

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that must

'In order to proceed further we need the guidance pi 4 be devnloped throu;;h a sys tens evaluation that vill 3,7 r.

produen the fo11oving information: .

assuning an SSC has taken place, to bring [

4 (a) A scenario, standby and finally cold shutdovu. '-

  • the plant to hot for:n a scenario developed by lj

,e have attached in draftfor Diablo Canyou.,(Euclosura 1) ,

the applicant .

- t 'a n t nust operate to (b) Identification of the s y s t e..s i schicve hot standby under this scenario. .

(c) Idantificacian of the systens that nust operate to achieve cold shutdown undet this reviev. f 0500220515 050722 Contact ((kggab63 ^

biablo Canyon -

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lt April 22, 1977 2-

3. Tedesco ' .

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trace available to and positively Peta 11ed drawings are*or to vill end be point

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cach systen from sourcesuch as block valves, branch '

identify.conponents operato or have no required linen that either nust function.

i tio'n of the Assumin; a loss of offsite power (hours)identif vs. long ca term (d) terr. respect to the 11stind of significance (days) of shortloss of offolte power vich developed in (b) and (c).

equipment complation of the a enjor milestono in the I know that This effort licensing cetion foralready is each ofstretched these planco. the linita but I

, are to this item as priority your resourcesyour consideration of nust request

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6.atter.

a draft detailedremoval listing of equipmentproposed that was

..lso attached is and heat (Cnclosura 2)for and a ,

required for shutdownfor Diablo Canyonthe by Wootinghouse list prepared by applicant as a Horch starting f general system 3) , perhaps these ofcan the serve syste=s and the Anna (Enclosure De vill need bo th, a list for cach plant in

. point. in thoso systens fuuctional components ,

order to proceed. effort I hope th a t we can a significant Since this will be of contact in the appropriate review coamsystons being establish a point the me=bors of the recourso throughout branches established, to which in Engineering any have ,

this task.

' J. P. Knir.ht, 3.s s is t an t Direct Lu db a ur e s : for Engineering Safety

.As stated .

Division of Systens 5'

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R. Heinecan, iSS y

r. Schroedar, DSS .

V. nenaroy a *, DSS T . ;.ov sk , .SS T. Ippolico. LSS P. Ross, .iS S 4

1. Sihweil, DSS ** _

R. ,osnak, DSS i

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/Y }tElf0RA!: DUP. I'OR: R. Tendsco, Assistant Director '

for Plant Systens, USS 2l'2J4 h4 D. Ross, ,.s c is c an t Director e

'for Reactor Sainty, 's S S M..! ,

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" TRO)!: . J. P. Eu l t.h t , Assistant Director - -

I for Engineerin;;, DSS I '

SEISMIC RE-2VALUATIOl* : NORT*d ANNA. DAVIS-BESSE f SU15J ECT :

A!!D DI AM.0 CA!n'ON 50-538, J % 4;"Y l

. The ACRS icttern f or iiorth Anna t'n i t s !! o . I and 2 and Davi s-3 conc Unit No. 1 and the d i s c o ,r c r y of the !!o c S r i fault I, near Diablo Canyon Units No. 1 and 2 have lead to a aciscic re-evaluation for each of these facilitics.

I

,i b *1 h c ACKS inttern vritten on :lorth Anna and Davis-3 conc speak to  !

4 a detailed reviev of thouc systens neccesary to accomplish

'fe "safo chutdown and continued shutdovn heat renoval" t

S inn to une a concistcut approach for the initial phanc of

), the Diablo Canyon evaluation, ,

'In' order to proccad further vc need the guidance that nust

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a be developed throu;;h n r.yntean evaluation that' vill

.; produce tho following information: .

.o* . p (a) A scenario, aonuning an SGC han tahen place, to bring J4 '

the pinnt to hot neandby and finally cold ethutdown. .  ;

lej t'c have r. t t a ch e d in draft form a scenario developed by [

the applicant for Diablo Canyon. (Encic nure 1)

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(b) Identificition of the cyste.n that nunt operate to y achicyc hot ntandby under this scenario.

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!! Identification of the n y c t e a r, that nurt operate to f 3 (c) '

W, achieve cold shutdown under this reviev. ,

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Contact:

blablo Cnnyon - l* . Chen i 8

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'" Tedesco ' April 22, 1977 D. '.*. o r. c -

available to trace Note:

Petailed drawings. from arc ~ortovill source end bepoint and positively cach sy n t ert identifythne components such as block valves, branch -

lines either nust operate or hava no requirec,.

function.

of offsite power identification of the

. (d) Ancuning a loco of short teri (hours) vs. long ter significance (days) loco of offaite po cr with respect to the listing of l equipuent developed in (b) and (c)..

in the completion of the i

for each of th ese planto . I know that This effort in a major milestonc licensing cetion are already stretchedthic iten an a priorit/

to the linic but I your nunt reneurecoyour request cencideration of j

natter.

3 detailed listing of equipnent proposed

..lso attached in a draft required for chutdown and heat renoval that v a r.

for Diablo Canyon (Enclocurc 2) and a

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by Wcutinghounc prepared by the a p p i. ic an t for North a starting general systen list Perhaps checeofcan serve th e systens and the as

> Annn (Enclosure will need3). *ooth, a lia Mc 6 functional componento in thone systens for each plant'in

, point.

order to proceed,

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y effort I hope that we can a oignificar.t v

f' Since thin will be of contact in the appropriate nyatenc cotablich a point 8

branches to which the r:enborn of the revicuchroughout teon boing Enginocring nity havc recourse

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.pf[" f this tank.

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Division of Systens g.

pi cc:v/nnel. ii S S

n. Heincuan, l'" F. Schroeder, DSS V. I.cn ar oy a , DSS T. ..ovah, .SS
  • T. Ippolito, t. S S '

9 P. Ronn, .s S S .

'I 1. Sihucil, USS **

R. onnah, DSS _ , _

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