ML16340A630
| ML16340A630 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/11/1975 |
| From: | Deyoung R Office of Nuclear Reactor Regulation |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16340A627 | List: |
| References | |
| NUDOCS 7911080188 | |
| Download: ML16340A630 (4) | |
Text
u':ITCD szazts gUCLEAII REGUI 'vTO<IY CO<'.Q,IISSIO((
T(ASHIIIGTGII,o. c.
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Fcbrulry ll, 1975
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Ciaa<<<lusso February 11, 1975
.,." ÃOa. 50-275.
"nd 50-323 A: Ciacbusso!
Director, Divisinn of Reactor Ucensiilr D?".!LO O'ViYOl) IKVIEQ The following ~able provides l:cy dates associated with the Diablo Canyon case:
U>>it 1 Unit 2 C. Application Cl'ssue:d OL (cpplication 1/16/67
(,/23/68 7/lo/73 6/28/68 1>>/o/70 7/LO/73 I.'- cnd ouz cnasulca:Its (U, S, Cccnlogic>>1 Survey and U. S.
Cna" t and C cderic Survey) cnnrurzcd wllb zhc npp)ie;Into'elected geological aac! Sc'is.-.ologi"al bases fnr <Iesig<I.
'lair. includec! cn SSV. of O.(lg.
Ae and our consul tant (li. H. !Icc>>oazI ) concurred wL th the applicant;s
'clccl.cd criteria for seismic dcsigr., includ!rg thc design spectra sad dauping values aud the <<ethods to be used for th'esign.
At the current tine Unit 1 construction is oyer 90/ car~plate and thc fu I load date is esti=>>tcd to bc about Rove.L<er of his ycaz.
The fuel load date for Unit 2 i cetic<aced to ba about nine ecadths later.
Ouz CL review is n acing ca.-.pic tion.
The SER with.
Ec:w nat bio v.s i, suc'd on Oc ob'6
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97 I '.e p-nci'p onis., oll
-cs alit assessxcnt of the geology and seis".)logy ro the sir<:
"lcw inforrsticn had bcco-a availablc durirg hc ccur"c oi our OL review and ouz cvalv" cion -nd tllat of the U. S, Ceolog.'cal Survey w s no" E)0 CO plctc at the ti"e the SER w..s issued.
Icn SZR Supplement was prepared far issuance on January 31,
- 1975, The staff had tentatively co>>clvdcd that, considering the naw inforrstian availaolc, an SSE v luc of 0.5g I(auld be eppropri=tc for thc ite.
Thc otaf h d a o
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Ve have.act internally on this problcr. Several times in the recent past up to the <'cssistant Director lcvcl.
On the basis of these discussions, ry opinion of thiv'it<>>tion and steps that need to bc considered is follows:
Thc applicant is aware af the cvrzcnt status ard i attenpting to acquire additional irfo~>>tkon to alter th Survey's opinion.
It c:cpccts to submit additional infor~>>zion I.bout '.<arch 1, 1975.
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'1'hc assessment of that info;=.arian by thc Survey and the staff vill result in an S"R Suppler;cnt. about 'lay 1, '975.
Trc ACES hao scheduled n tva-d>>y Sclbca-.x.itzcc
<<<cating at thc site fcr February 18 and 19.
U<ovc:cr, the Ca~ittee wil probably not carsidcz I.he Diablo Canyon spplicatian v"<til its June =caring.
Dcc;lusc of thc llutclze of. thc problem and colo "ha d" decision that nust be r"dc, I would anticipate a sc:cond aeeting might bc rcccsssry zwo <<cnths after thc first electing u!lless thc ctaff can propose a strong policy-!ypa clccision at thc first meeting.
Ir. any c:vent< the appLicatian is stzo>>gly contested, and I would anticipate that th PDD will be la cr than thc I!>>te at which Unit 1 i!illbe ready to load fuel.
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Thc current "be"t guess" o" aur geology-sais=alogy ota f is that the fin..) Surv y position cay well zclazc fzca its prcrcnt state (tne p-I:"cent position would zc:"u' i."c an SSE val 'of about 0.7g) but will n t l'holy result in.",n SSr. value )csa thar. a'lout 0.6g.
The currcr.t "best guc s" of our " ructural-I c h uical staff 'a
~ that thc currcllt clcsign vi13. not br. =bio ta bc dc.".Onszza cd to bc accept=blc for a sci 'vie loading i!1 ercccss of O.SQ hr.
- cxtcns ve roan.;lysis co<IN bc u'd rtahcn by the applicant bu villprobably show that so<ac parts of thc plant arc capable of deter<oined that the as-built facility ~ould be able to ~ithstand such an accelcratian but with little or no <<>>argin for zcany elc"cnts of the design.
'Qlc st ff cxpectcd that its corsultart's (U. S.
Geological Survey) rcport would not conflict with its tent" tive conclusion on the 0.5g value.
Thc Survey's'rcport was rccc ved on J nuazy 28, 1975, and staff repzcsentatilca met with rcpicscntativcs of thc Survey on January 31, 1975, to discuss thc Survey's pos'tion.
Thc significant aspect of that position is that thc SurVey, on thc basis of now availablc infornc>>tenn, believes chat cn accelcratica in excess of 0 ~ 58 is rore appropriate for rhe Diablo Canyon sire.
/. ~ Ci&usso Pcbzunry ll, 1975 p( Ciaxbusso Pcbxuazy 11, 197$
withstand)ing various loadiugs in excess of 0.4g, O.Sg, Dr6g, ard 0,7g> bu) than other vital parts Mllnot have such capability, Stoic increase ill capability is possible from design changes that Mght bo undertaken but changes sufiicicnt to bring:he design up to a 0.6-0.7g capability arc inpractical.
Thc design rcanalyois could take up to a year or tuo to complete.
c.
Establisl~cnt of a special policy advisory group to aid in the decision-s(aking process.
This night include irdividuila such as Dz. Xouts, D'nuth, R. Cl~~oguc< ctc.
- 7. bc)icvc thc abave outlines thc present situation as l(c fn L(All-I vice it. I strongly recommend your imediatc ctcntion to this problesl.
3, 'hc staff is faced vith a horrendous bacltfit decision.
The decision (-'ill likely bc based cn both tcclrn caI and poli<I; considerations.
bhiln thc tcchnical considerations nay be altered by addigiorsl infomaticn that t(ay develop durinp thc ne..t anth nr so, tho degree of alteration i's not ezpcctcd to be signifi-cant.
- Qczefore, the basic problems that uill eitist and the basic decisions that vi11 need to bc mdc src knom at this tiae.
Those vho (%11 bc involved in the policy decisions (the Coen(isaion cannot bo involved accordinp to T. Kqglchardt) should become knoulcdgeablc uith the sit(nation as soon as practicable.
Since thc policy decisions villbe influenced by the technical facts and practicalities involved, early involve~(.'nt in the on-going tcc".+ical zcvic(. r"y tc prudent.
Ilia car'inst and soar. direct scans nf undczs)andirg thc tcchnical issues is probably throuph attendance at
.ae February 18-15, 1975 Subcor=.ittcc nc ting at the site.
Thc Subco~ittcc uill con.i: t oi Dr. Okrcnt and Dr. Bu h (ard perl:aps L. Fox).
fn addition, up to eight ACRS consultsn(ts (Cll participate.
II copy af our =s ct'ng notice and tnc apenda for thc @ecting is attached.
Tl(e proposed attendance
~ by Dr. Coultcr of the Ccologic..l Sunny is indicative of the seriousness of the Survey's concern in thc matter.
rnclosure:
}lceting llotice cc)
R. S. Boy)
- 0. D. Parr
. ((allison T( Hirons
/sgj>>
R.
C. DcYoqng( Ass stant Director for fight 'Vatez Rcactozs Group 1 Division of Reactor Licensing (l.
Consideration night also veil bc given to:
a ~
St7engthcning the legal contingcpt as igncd to the case.
In addition, a zevieu ripnt be crde of the assigned ASLB to assure the level of. cr dcntial"-and czpcricnce is con-sistent uith the tasl: that is to ba faced.
b.
Strengthen'ng thc cn."incczing sta" by providing for
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pccial consulting advice from pzoups nnd individvals aucll as lie= arl: Associ tcs, Frankl n Inst rute, Pr ~ J llcndric( etc.
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