ML16340A631
| ML16340A631 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 02/20/1975 |
| From: | Deyoung R Office of Nuclear Reactor Regulation |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML16340A627 | List: |
| References | |
| NUDOCS 7911080192 | |
| Download: ML16340A631 (4) | |
Text
Uwl 1 ra STA'IES tIUCLEAfI REGULATORY COrdcllSSION IvhsII!HCTON. 0, c, sosss p, Gianbusso 2
Fc'oruary 20, 1975 February 20,. 1975 The two nain concerns which uill dcternin<<
the SSF. "p" value arc (a) thc geological definition (extent) of th>> I!osgri fault
- xone, and (b) thc scisnic ev n-that.nust bc assuned to occur nrI the offshore fault.
I believe that. the USGS geologists (lead revicwpr - F. tlcl:coun) uill naintain their currently indicated positiop.
Thc "no~" infornation descrii>ed by the ppplicant and to bc fornally docurcntcd in thc near future is not, liIIely to convince the USGS to alter its current findinp.
I belie've that the "n'w" irfo nation will convince thc USGS tilet t,e 1927 l!TIgnitI:de 7. 3 corti qual:e occurred on a transverse fault and, therefore, n cd root be con=id<<red as capable of o currin"on the lia ari fault.. LI:lieve rhat the USGS eis~lcgists (J. Devine - lead ".evlc:>cr) would conclude that the appropriate "g" value for thc site would be 0.5>> if they cou)d assune that thc fault lcngttI werc linited as tha appli-cant contends and thc 1927 event occurred on a transverse
- fault, However, if the fau)t lerpth ia deternincd on rhc basis of the
. current USGS ecole"ical intcrprctation, then ti>e cisnic event
.ar. rust bc assuned by thc USGS saisrolo>>istsI in order to be nsi ten-uith thc nathodoloUy used for the S n Onofra 2/3
'aluation, uill result n a site "g" value si"ilar to that It mined for thc San Onafre site (0.670).
If. is ny opirion Cv 00-I tt CC eg dr g<<UTIQ>r
,-"..r;:) ".
>p>. Igqr1 t'ote To:
h, Giyrkurso 1
DIABLO CANYON - SBISt!IC ISSUES AC.,S Subcommittee IreetinU to review. the Diablo Canyon Ol. application
<<as cpaducted in San Luis Obi"po on February 18 and 19, 1975, Thc Sub o"..>i)to.e consisted of Dr. Ol:runt (Chain an) and Dr.
Bus!>.
In
- addition, ven AC?S consultants werc in 9ttcndance the first day of the n'.ctiny which was devoted alnost in its entirety to thc seipnip
'ssue.
91e pccific nett"."".discus"cd included Bcn
~ ey, seiss'alogy, seisnic dcsiSn, seisnic tcstinB, and seisnic scran.
On thc basis of -y attendance at tlIc neetin>>
and side discus tons uith other rtaff ce:1><<rs,. USGS representatives, and applicant and I!ertinBhousc partici-pant, I ca-..c away uith the followir.g inprc sion
~
~
..that, unles= specific guid ncc appropriate to thi.s unique situation is provided to thc USGS L'colopicts and scisrslogiatsI ti>ey will prccccd uith thc'r review basinG it upon their standard nathods and arrive at a "ite SSK "g" v.1luc uell in excess of thc 0.4g value approved for the CP and u ed for the design of the alncst conpletcd plant.
Thc as-bui1t plant has'iBnificant narpin'n its design ard it is capel>lc of resistinI, scisnic loads well in IIxccss of those associated with thc p 4g seipnic:event assutIcd for desi"n.
Thc staff ia present)y conviqced that the dasii!n ia "Good" for a OI5P cvcnt.
liow vcr, to corvincc thI.- AC!IS and oth"z of this wil) require 3-6 nonths oi applicant and staff effort. I" "n
~
~ event in tiIC.OD~~.JIP~l+I~mrl"irI>>"~r't
<<ill
'be possible
~
to show that nany parts of t!ie plant can safely resist such loads;
- however, nany parts will need to be nodified "nd very likely for "one oi th se tl:e nodifications will ro be practical.
The ev lusrions to acconplis!I such1 a cask, with thc rigor that will be rcquircdI uill enrail yc rs of applicant and staff effort.
3.
Thc "rane" of thc questions and cow>ants ron the ACPS Sui>CCnwittcc ncrlbcrs and th'e consultants indicated to ce thar. the) would find a 0,5<<va'ue acceprabl and could be convinced that tha s"built plant could adcquat ly resi q thc increased loads a so"iated with the 'ver.t.
Ilowevcr, th9y erc not likely tc bc 'Ccnv need unless.a rather conpletc analysi ia perior.".ed for a 0.5>> event
~and the u"e of our currently sIpproved cisr ic deaicn criteri To date no suCh analysis ia avai)able; the prcsaITt positions of the applicant and thc staff a-to the ability o tlIe pi.ar:t to pdcqu Itcly resist a 0.5g cvcnt arc based orI qual'tati'za 2.
aascssncnts supported by..
Cqw typichl calculations.
H in sugary>
as a result of devclopnanta du".in'he p"st wee!t, I coztinuY-to believe that, unles specific guidanccI support a"..d dirccticn ic provided prosptly by the upper nanaGcncnt level at
.".RC and USUS to tho "wo"'lin>>" levels in the tuo or1>>anixations, pcs'rioaa that da nct ncccssarily refIce-.tha 5ud~yent pf upper-level nanagunant uil'e fox>ulated and docunen ed ro the cxrcnt th"t larer xodification <<ill I<>gly rccm.".cnd tl:t i~cdiatii meetings bc held with upper. mnageccnt to initiate actions ro pro"ptly develop a firm basi'or stahing a decision on Diablo Canyon. Our prelittinary thoughts arc provided 'n the enclosure. gfC gpMp~f tj R. C ~ Dcroutg Assist1nt Director for Light I'ster Reactor" Creep 1 Division of Reactor Licensing
Enclosure:
Diablo Canyon Gcology- .Scisnology I ~ ~ cc w/cnclo urc: Ro )leittc an F. Schroecer }I. Denton R. llofa-".tr. C. Stcpp O..parr
- 0. Allisor.
~ ~ ~ ~ ~ ~}}