ML20212M362
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Q4 UNITED STATES
- 0 HUCLEAR REGUI.ATOD COMMISSION
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N.' i.2 ADVISOnY COM.VITTEE ON REACTOn f
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June 8, 1978 I
Project:
Diablo Canyon Sitt Units 1 and 2 l
l Status:
Operating I.icence Revicu Subco::-tittee !!ccting - June 14-15, 1973 Rackgrncad:
Octob2r 1973 - FS.*? cuhnitte:1 Septerber 12,1974 - ACt6 Subcoriittcc meetin'.'
October 16, 1974 - ILC Safety i:valuatica ncport (Slit) issued Janucry 31, 1975 - Sutpler.:nt I'o.1 to ST:R inse?d February 18-19,1975
.*.CES Schcort.ittca rc:cting May 9,1975 - Suppl:nnt No. 2 to SER issued llay 23,1975 - Acc.i Cubro:rraittec :reeting June 5,.1975 - ACR3 c:etine:
June 12, 1975 - Partial R: view ACES rcport Septe.rhar 18,1975 - :surpl:mont No. 3 to SC2.' icrued llay 11, 1976 - Suppl m:nt No. 4 to SER issu2J
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ltay 21, 1976 - ACI:S Succovaittee e.ectin; June 25-26, 1976 -TO S Subc0nr.ittee m:cting N
July 0-10, 1976 - ACF.!l m ting September 1976 - Sucplcnent Ko. 5 to S"A iscued October 11,1976 - ACP.5 Sulco;;a:ittec meeting Ibverber 13, 1976 - ACC3 unctin; June 21-23, 1977 - ACPS Su'conmittee meeting July 14, 1977 - Supplem nt da. G to SDI issu..;
i August 2,1977 - Acr.3 Schec.r.nittee meeting Auguct 11-13, 1977 - ACES : ceting August 19, 1977 - ACES Letter on Ucnscis:nic Items May 26, 1978 - Suyplement l'o. 7 to SER icsued The Dichlo Canyon units are ecsontially ichntic.91 ;eutinghouca four 1cco PhP.n t.'ith core th:rdal po;.'er rating : of ?33P, F,2(L) ctr.1 3411 ira (t). 'lhe plcut in located on a 750 acrc site adjacent to the racific Cecan in Scn Luis Obicco County, California, about aideay hat cern Los Angeles an.i San l
Francisco.
The ACTS reviouc<l the application for an operating license in Jt:ne 1975 and wrote a report covering all aspect:< of the Pro-osed operation e>:ccut the seictiic decign bases, the adequacy of the seiciaic denign, protectiers againct tsunraic, protection against tornado miccilcr, envircir. ental cualification of certain electrical couiptent, water ham.:r effectc, ctt-ccm.,artrent analyees, systemn interaction, presrure vesrel suprort strt:cru A'lui, and generic itema relating to EhUs.
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Sub.eaguently, ancther ACRS letter was transmitted en August 19, 1977 re-garding further resolution of nonscismic matters.
The current revicer addrescen only the scicnic issuon.
The original desigit was for an S3C of 0./.g effectivc acceleration. Cubacquent to the icrucoc -
of the construction permit, previously unknown fcult (the Hosgri fault) t.
discovered offshore in 1971.
Followinq its discovery, the fault was ct.u?:
extensively and in 1976 the Gaological Survey concluded that the fault w--
capibic of producing cn earthq:.ake of eagnitude 7.5 on the :lichter ccale.
The Staff's consultent, Dr. R:cs.9arh, conclu::ed that thic would produce an effective hori:entel ground acceleration of 0.75g.
hithough the Ap?licent doec not cgroo uith the !!RC Stcff's evalacticn cf the c verety of carthquahe possible frco the Hocgri fault, he has precced, uith a rean Jynis and strengtbening of the plant baced on the Ho gri event-The ACCS cnd its consultants have toen kept informed of the coismic deciT baccs end the reanalysis program. The ACPS and its consultar.ts have not formally cgre:d that the cois:oic dasign tsses are oppropricte or tint tim plant design is edcquate. The purpoco of tJtis rteeti:q is to attccc:t to reach a decisien regerding the adecuccy of the bases cn3 the rennalycia.
Coments frca all of the ACES consultents have been provided to the lhtC N
Staff and the Applicant.
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