ML16340A633
| ML16340A633 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/05/1976 |
| From: | Deyoung R Office of Nuclear Reactor Regulation |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16340A627 | List: |
| References | |
| NUDOCS 7911080199 | |
| Download: ML16340A633 (4) | |
Text
PROGIUul TO ESTABLISH BASIS TO LICE!ISK DIAI'il.O CA.'>YOH BACKGPOIDD A!ID PROPOSED PllOGILQ!
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Formally e<Iuest thiit >In independent rcvicu bc conducted pi thin USGS to c<<nfirn o. "edify th cu'r <<t USGS "cv<cu tea
. "';<din;:.
..This r <;oc.';i. tli.",ht bc mac!e by Chairsan k~dczs to th" Sect'cary of the Atcrior and could> if 1c<al considurat'on
- demand, be based OA ~'cnrric !fest Coast fonccrAs rethe tllal1 t lc Di'bio Canyon issue alone.
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Concurrently, form a tea:; cf consultants cond'sting of ""n of nat'onal Iltature iA t!Ic fields of geology>
sc smologyi and "Qi"...1c 4 ss<fsl to evaluate thc situation.
"has tca nignt pur'ua various path", includ]ngl
'onstruction pcr;u'ts vere issued for Diablo Canycn 1
G 2
<n April 1968 and Dcccrlber 1970, respectively.
U:lit 1 is nearly co=:olctcd; Unit
- i. a yc,.r. o1 so,behind.
The S>Sr. Cor the site pas set by Dr. l!QI;.ari:
the
- VSGS, and the U.
S.
Coast G Geodetic Survey.
T'!IQ value sclectcd pas 0.4" and the p)ent ha" been constructed to that valve.
The OL applications Car bot!I units pere docketed in October l973.
0:r review vis <<ssenitially completed by January 1975; nt that t<r. vc recognised tllat on thc basis of nep evidence the SS". vould be increased.
"<A>p staff believed that the USGS vould concur vit:I a site
"<" v:<lue of 0 ~ 58 and lad done su 5 cieAC vo
.< to convill c us th" t:lc
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could sci'< ly v5 the tend such an cer.hcual:c.
On J..nuary
? 8, '975, ve vere surpri ed by Ii USGS report that conclpdcd chat an acccleratiori iof 0.58 pas in its opinion inade<Iuatc for the site oa the basis oi Jirescnt info1"".!1tion.
. At tlat tilse D!J. reco<<acnded that tvo approaches be tak n to rcsolv Ihc i 'cue.
First, co:ltinuc to ac<<loire addition
'- infor.-.",ticn to conv5:1cc thc U 'C>S 0> tha
<<der>uacy of a 0 ~ QI; SSL>
ccc:Idly i assu
. the USGS al. tile rcy oper lcv 1, pool-'crxin ada<a>".rt and scr.'ithcr renns tn confirm or I~odify its i'..d'r..
Th 8 c'ion vas I.nde to pursue only thc C rst approach.
- Tcilay, 1:e are esse:ltially vhcro pc ucrc la"t Janua.g except that the plant is al".est ready Col C<<cl 1ocdirg.
Once a>a'A we are faced pirl: developing a pro,",rcn to establish a basis to permit a decision to be m=de OA the liccnaiIIP of Diablo Canyon.
Pc belicvc it l<ould be imprudent to once 8 in pursue a sin>.le path bascu on acquiring additio1al inifo't'
'to convince the UPGS reviev team ja relatively fcv I>divi<.'uals) to modify i.ts current.po iti(in.
lfe ugain rcco~slend a ".uiti"fac ted approach.
The program l<Q vould pzopo c to Pursue i" as follcvs:
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In
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pt 30 sscr:a a. great earthquake could Occur as the A
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>1 fn>>1fes <<!q ""
as t e USGS revfcu
'!!z "c"oastr<<tc by logic evidence d ) dc""
b.
Pn inde>>cndcnt cval-u tioa oi chc CVidcnce to <<rlfvc'c a conclusion on the SSK that <<(frht bc cor:.>ared to those tl:c USGS cvlcu r "!
by thc licensee.
ca!l <<nc thc Panel of experts cstabli h d a
s c
c.
hssess thc ms cc p
p ts for upgr gfn thc plant desi n t hi h SSEvslucs bv
)as ir p.tic analysis and/or structural nadifi-catlons and testing.
Concurrently, fern a t,. k
'..sk.Orcc to rcvicu the current status in cn atterpt to dctcrr!fnc if a prob<<4" i. l ba. f" s lcd to lie nsc Unit 1 for an int l:l c the other rcvicus
>>>rc being coacuctcd.
Con <<r.ently, info'he 1fcenscc ni tnc cour e of Ci 0
<<CC on
'l c
(> '
viflg aild rcgufre IlLA to purse>> sfQf)<<Y hind/0>>
a tc nl ou>> cval<<r>Cion of hhls cffo fforts cupplc=cntcd by nur independent
>.'-"',".>>A(". AC(M:!(
V>> a"e
.>> a e pla>>ning )o take i..cdfatc actions ra initiate snakc of the approadles indicated <<bore.
Speci ically ue plan to!
1.
?><<et uit!
NPZ, na" approach n" to obtain. a" a>>~ac~
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ASSOCIAccD CO
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ln developing a prngran to folloM Co rcsoly Che Di.<<bio Canyon pro?",c" >
consider<<lion should bc given ro; The i<<peer, of our decisions nc? the nation's energy proolc.-.s end program"
~
The fnpact of potcncfaI denial for operatio:l of "
plant approvcci for construction cannot be undcrcstfnatcd, cspcci lly ubcre thc basis for denial ip in controversy, Thc irpact of our decisions oq the r(oratorf!L<< before thc Calf ornfa
'voters
~
Tbc in>>art of our deci..icns on the viability of ccntinued opc>>atfo>n of p]n>>ts at other. sites lritb altered sefsnologfcal bases>
such as San Oncfru, Pilgrl. l, ctc.
Thc f:par.
of our decisions oq the vfabfl<ty oi continued oper tion of plants uhc:re it i" uncertain that tbe capability exists co uitbst<<nc( altered design bases in areas other than seis"ic design,"
such a
contafnltcnt structur<<1 design, pipe ship facie(
ccntain-t!Cat? spurious v<<lvc failures> ctc.
'1 8 PO 2.
"~ " tn-nrrnr
..C..t tn nrrn:r (at Chic<<gn, Illinois) "fth 4.-.
Rel.".<<<<rk tn begin
- o foraulstc tie teal oi cnasul.lan vc
<<nd thc task force discussed ill icc.". 3 <<G'ovc.
lg Dr. Ihc-nark vill aaka a prc"'l a"i t
on 0 \\ls so
't?Iac ve
'l t", c It ons of hfs recent nay clearly underst<<nd the basrs a>>d lfr:ft. i paper nc? seismic dc ign nargfns and.probabilities anPdeaechanical f<<flu@ca.
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~
'cct here
.>Cct here, later this ueell( uith the liccn c:c to advise hi<<l of the current stat<<s of rcvfcu and of thc ro ra!<< ue pure<<c to cstablich 4
1>> f a
as ol n deci sf on. '
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In v~eu of thc seqfousncss of thc ploblc i" f" R 'cl>><<to f lJAJgcr>cn
>Q iv >0 d
5 If l
"n cn>>sultan and* ti:c probabllit r-s!
p
~
y r-s.:.nr"e.
The.. l.n.c.rs should c
hc
> g;st level t(<<a<<gers thar, ue can practi "ally assign to thc
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