ML18114A666
| ML18114A666 | |
| Person / Time | |
|---|---|
| Site: | Surry, 05000434, 05000435  |
| Issue date: | 05/21/1979 |
| From: | Hendrie J NRC COMMISSION (OCM) |
| To: | Butler C, Butler M HOUSE OF REP. |
| Shared Package | |
| ML18114A667 | List: |
| References | |
| NUDOCS 7906110367 | |
| Download: ML18114A666 (4) | |
Text
,
May 21, 1979 Distribution:
Cen tra 1 Fi 1 e LVGossick HRDenton TRehm HS ha par CA The Honorable CaldvJell r*i. Butler United ~tates H~~se of Representatives vi~shington, o.- C.
20515
Dear Congressman !3utl er:
EKCornell PRiehm,, NRR MGroff GErtter, ED0-5695 SECY 79-0529 EDO: R/F I have received the i_nquiry regarding the shutdo\\'m tif tile Surry Pm*Jer Station, dated Match 19, 1979, from yourself and from other men~ers of the Virgin{a Congfessional delegaiion and I share your concern that this matter be resolved promptly.
\\*/ith respect to your request that the Huc*1ear Re~1ul atory Commission I s staff be pr~pared to expedite ~1e review of the Sur~y Power Station pipe stress reanalyses, certain steps have already been taken by the staff hwtard this end.
FollovJing the lJuclear Regulatory Commission 1 s_
order to shut down the five nuclear po1*1er plants; including the two-unit Surry Pm,1er Station, independent revievi teams fot each affected,
power plant were established within the staff of the Office of Nuclear Reactor Regulation.
In particular, the staff revie\\v team for tile Surry facility is dedi cnted to prompt revi ev, and ana 1ys is r:if subrni tta 1 s
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by tlie Vfr~inia Electric and Pm1er Company (VEPCO) 1,vitl1 respect _to the Surry shutdown order.
The Surry review team has met with the lic0.nsee at the site of the Sur'ry facility and has travelled to the Stone and H<~bster offices jn Boston to review the preliminary reanalysis r<-:sults.
H1£:i Surry revi ev; team slrnres no members with review teams for the other affected povier plants and rema.ins ready to promptly reviev1 VEPC0 1 s reana l y ses.
It should be pointed' OL!t tfiat at this time VEPCO is reanalyzing the affected pi pi n9 systems of Surry Unit ~Jo. 1 only.
Surry Unit No. 2 has been shut clovm for steam generator replacement, and a stress analysis of the Unit !fo. 2 piping systr~rns 1)ill follo\\'1 the current reanalysis effort for Unit r~o.
- 1.
The staff revi e\\'I team for the Surry Pov,er Station will renairi available for prompt review of the VEPCO submittals for both Unit No. l and Unit No. 2.
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IIG.C FORM 318 (9*76) NRCM 0240 u~s. GOVERNMENT PRINTING OP'FICE: t 978 - 2os - 709
e The Honorable Cal dwell.M. Butler. l1ith respect to your collT!lents regarding site-specj f,c. consi deratfons.
_ for seismic events at the Surry Power, Station$ r offer the* following corrments.
As you -noted) the foundation conditions at the Sur:ry and -
Beaver -Valley sites do differ. The Beaver Valley 'faci-lity* is-founded. _
on about 50 feet of-sa_nds and* gravel *which_ oveY'.lay rock.
The Surri.
- facility is founded on about l30Q feet *of sediments \\'Jhich *overlay rock.
These conditions$ -including the charact~ristics of overburden* 9amping
- and aniplificationof vibrations from bedrock to* the *surface$ were-.*
. _ taken into account.in.establishing tne*:seismic' ___ desigri6asfs.for.each of ~h~ plants.
Insofar a*s. l oca i *sei smici ty *.;s conce~ned!* the 1300 feet -of o~e-rbu rd,en at *surry s*ite: masks the basement rock so* that faulting --cannot be*. :*_
- _identified in.the area. _-ThJs is *true for ino'st of the eastern)nited.
States.-_- Si nee _the tectonj c. structures which give rise to earthquakes
(;annot be identified 'and iocaliied~ our practice 'is to assure that
_earth.quakes at least as se*vere as_ regiqnal*historical earthquakes,could occur anywhere _in 'the._regi\\m~,-In Qdditiory. dn;establishi,rrn the se.ismic design 'bases for a nu'.clear povier..plant~ we take i !1to accciimt*_.th~ i.mpacts *
- ~on that plant of more:ct1ttant*earthquak~s.*.-Forexample~ *the-Charleston~
South Car9lina _earthquake of.-1886-was felt; -fo _the region of th~ Sµrry *site-._:
'v'EPGO is*.-consi.dering Using*.an:advan*ced anaTY,~i-s.method which takes*:into
_ account _soi 1-str_ucture* ; nteractions. tct determine Sur-ry pl ant-response -.
motion, due to seismic events.* -_Thi's,method _was used.* by V.EP.CO..for the. *_
design *of*.the: now-cancelled Surry :unit Nos_. 3 and 4 *., Ho\\tever-~ it \\'/as'
- n.ot used in:the origfnal *design-ana-lysis *fqr*-~urry Unit Nos. 1 and 2.
~le have maintained adialoglle with'tVEPCo*r~gardi'ng-t;he use of_*this..
,, techr11que. for _Unit Nos. l _and *2, and VEPCO is a~rnre of our re*quirements i ri this matter.*
While* ~,e-coritinue.to meet witJ,::VEPCO and $_tone and -Webster, representatives to-discuss preliminary results of their reanalyses~ \\'le are: at this time a\\.raiting submittal of these results by VEPCO for staff eya)ua.tion.
Follow-ing the staff:eval~atibn of the VEPCO submittals foi_~ac~ reactor unit,~-
- we-.\\.'iill be fo a position to recorisider'whether continued s*uspension of -
operations at* that unit rema i n*s necessary or.appropriate._* The staff 1s recommendatton*conce_rning possible resumption of operation *will be*
considered by the Corrmissi_on before a final decision is ma:de.
If you
. have* atiy additio_nal questi.ons~- please contact mi-office.
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Distribution:
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Sincerely;
- Central File*
LGossick Cleared.with all-Cmrs. by SECY C/R -
- * --~i-lf1ne1,, HDenton Revised based on Cammi ss 1 on. comments, JoM!pl:i M~ :ffe~te _ TRehm b~1"f~i~ea-~y 1:-,i:1:*Ri~h~r,~N~R~-~ ;~?-:i*~.. -,.i-,-c-;*,-:* r-~,-,:< __
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. 1:00' '5695 SECY 7_9.-0529 '
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NRC:. FORM 318 (9-76) NRCM 0240
-k u; s. *GOVERNMENT PR_INTING OFFICE, 1e711-11211-11~
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The.. ~onorable Caldwell M. Butler Uni te\\d States House *of Representatives Hashingtons D. C.
20515
Dear Congr~ssman Butler:
Distribution:
Central File LVGossick HRDenton TRehm HShapar CA e
- EKCornell PRiehms NRR MGroff GErtters ED0-5695,
. SECY 79-0529 EDO:R/F
- I have rece~\\9 the intjui ry regarding the shutdown of the Surry Power Stations dated\\~(arch 19~ 1979s from yourself and from other members of the Virginia Congressional delegation, and I share your concern tilat thi.s -matter be res*ql ved promptly.
' \\'
With respect to your 'i,equesf that the Nuclear Regulatory Commission 1s
- staff be prepared to e:,.;pedi te the revi_ew of the Surry Power Sta ti on.
pipe stress reanalysess\\certain steps have already been taken by the staff toward*this end.
fpllovJing_the Nuclear Regulatory Commission 1s order to shut down the fite nuclear power plantss including the two-*
unit Surry Power.Stations i'ndependent review teams for each affectect power plant were established~vithin the* staff of the Office of Nuclear Reactor Regulation *. In particulars.the staff review team for the_
Surry. facility is dedicated to" rompt review and analysis of submittals by th~ Virginia El'2ctric and Po111 r Company (VEPCO) with respect to the
- surry shutdown order.
The Surry view team has met 11Jith the licensee at the site.of the Surry facility a-d has travelled to the Stone and i,Jebster offices in Boston-to review-t~:1 preliminary reaflalysis. results.*
The Surry review team shares no member with review teams for the other affected power p'lants and_ remai_ris ready ~ proniptly review VER.CO 1s reanalyses.
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It should be pointed *out that at this* time.-VE.PCO is reanalyzing the affected piping systems of Surry *unit No. 1 o~\\ly.
Surry Unit No. 2 has been shut down for steam generator replacemen.t;'-.and a stress 'analysis of the l!nit No. 2_ piping systems will follow the\\~urrent reanalysis *.
effort' for Unit No. 1.
The staff review team for \\the Surry Power
- Station will remai,n available for prompt reiev, of the-VEPCO submittals f o"r both Uni-t No. 1 and Unit No. 2.
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me. PORM 318 (9-76) NB.CM' 02"0
-tr. u.s. G~Vl!!:RNME!NT PRINTING"OP'P"ICl!t: 1171.. zee
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e Identical letters to'.the following members of Congress:
Robert W. Daniel, Jr.
Herbert E. Harris, II David E. Satterfield, III l~illiam C. Wampler Dan Daniel Joseph L. Fisher J. Kenneth Robinson Paul S. Trible G. William Whitehurst