ML20244A626
| ML20244A626 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 05/14/1979 |
| From: | Whitmer C GEORGIA POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| TAC-07939, TAC-07940, TAC-7939, TAC-7940, NUDOCS 7905170234 | |
| Download: ML20244A626 (5) | |
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Based onsour preliminary evaluationsJusing the loading information i
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modification.neededstotconfoieEt%thD,TPilc'ceptanca.p.riteria-consist only
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-a Junits.%2bh(pertiment!desa11s!.wiihNegard*t'otthe aforementioned modifications 1./
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.m fi : have.b'eei6. tr.an.s.m.i.t.tedsto kth. 47" Gaion nin.;o.ur. : ea. rlier. correspondence.
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- jnodificatim0vouldinotitolat'c" containment?pLf deas>od Decemberj.1980.tAnd y pM.;Mcompleted. by.the end.of:
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integrity)t will be completed:by y % s p d$;y hf contained...as an,, enclosure,p e
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h pool'tienferature'(iPe.[stabilit$ limit) as applicable to ramshead'
';. / 3Thejcommisston s leeter of krch'12,19797
. Aa report addresAing the NRC staf f.' evaluation of the' threshold suppression t ;c 6 c ffp. J'y
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' NJ representatives of Georgia Power Company net with the NRC staff on Apr11'.3,f /p;.#p' relief valve'S/RV: discharge devices. Subsequent'to.our review of.the, report,:
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1979,3co address the iteme.statedfin the report., At.the April 3, 1979,::., f W@g*%gjp,g
~ 7. -necting(;our.. representative *{ indicated that_the items stated.in the"sta e
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.g Company;for.. Plant Eatch andpM
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g; ~ Based on the results of our analysea (enclosure to our letter dated April 3,..._
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7dS f 7structdral' avaluationf f or varioEs crit em1 : load combination' stated in3the.iE i
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MdQ E LTP Plant 1Ucique Analysis ? Applications Guidei ~ Ihe results of our. preliminary #'
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.g J; %ds.tructura14evalua*na.are.coc.taided in the enclosure to this letter iSince ikT Vf%BuppdFCsystis(24ciggd2M*Wturally-stronger, Que,;ps/ sad 3R w ' G., !
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% purposes &The evaluation [edeceipasses information 'avm41mh1Nfrom [$%'.M@
1nlo'rm7a the Mark I LTP, pinnt unique'S/RV' discharge tests, and results of structural analyses submitted to the NRC during the Mark I Short-Tern and long-Ters Programs.
As indicated at the April 3,1979, meetinn based on the results of the current evaluation, plant unique tests and previous evaluations, the Plant F
Hatch Torus Support Systems conform to the LTP acceptance criteria with-
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ramsheads as the S/RV discharge devices. Hence, thejgep).ac$ ment of;ramsheads f.
irealm ?nfathe MarW'NT a/KY.rdischarge devices;sho'oId not fall under :the icith.J., quenchers _as;the S m
s it is neither a najor nor a minor modific.ation u?
from the Mark I LTP standpoint.',.' However, Georgia Power Company recognizes
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' ' s, $.', that;T-quenchers may havaitolbe ' installed in each unit towards the resolution N?. WM
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i iM 1;of generic 4TWS concerns.h Based on ourjevaluation of the effort which would /1.',N. J.4M g, 7 ' be required to insta11:.T-q6enchers by December' 1980' ' it is our estimatei bat '$ '.
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. J Me,[% ; the. time required forNormal~ shutdown to ' accomplish routine maintenance and i*ach3 nit vould have to be shut'down an' additional three (3) months:beyond'
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- M$Of refuelihgi thus depriving ~ the Cecrgia electricity consumers the economici..,P
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7 mm M. En, safetyEof the public villiot'bE. unduly'cadangered by continued operationf.,Q
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benefits of half a reactor ' year... As stated earlier, because the health and, >if M
~ ~$@W twi'th ramshesda 'as 'the 9/RV discharge devic'es, and in ordai to avoid < unnecessa
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expense and hardship.to, Geoyia Power, Company, customers, ste;hava scheduled'J.
y 9'V QtheiinetallationdofitieM.y432FT'qMachersnelsvenrin-eech lunitGin.
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anticipa. tic.i.a. f.T..si..oT,ution'.o., f *t.h. e'ge. n,'by.ictATWStissue.-O. ur s chedu.le3rf21
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wallow l.for completion. of ethis. program er..Jt6e' lend of"De+cembe. c.1982silE J
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i ura i ' 'Z Director of 'Nuc ear' Reactor ' Regulation $/ #
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UfS. Nuclear Regulatory Couninaion I
May 14, 1979
/
Page 'three 3
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. 'm In light of the 'information and bases presented in this letter, our
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. - d!?:i E % Plant. Unique Analyses to be submitted as a part of the resolution of the LTP 741 i{.N3p D%Q'g*2ia" "$1"8$**d asth $/" d= ice
- will be Per 4
2 will"b'e base'd on'T-quench'ers'as the S/RV discharge devices, i.e. :no'further,Wif
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In concheion,. we have-detequimed that only the vent-header deflectors e > < ',
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.are deemed necessary as major ' modifications towards the conformance to.A:he '
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. LTP acceptance criteria and these deflectors, will be installed by the end of
. I T: '
k'M$O{lh ?5the 'end 'of Decenher s1981,1T-quenchers will be installed by the send 'of. Decem-P/*@' 'f h
.' December-1980; any other secess'ary minor modifications v111,be courpleted by Vl a.
o i APly.
Ther?1982.' the PUA for each unit will be based on T-quenchers as the'S/RV # ' TO%
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discharge device 7 and no 'further structural evaluation based on ramsbead as.
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3 the S/RV discharge devices will be performed unisse specifically requested otherwise by the Cot:anission.
Yours very truly, p -)...
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__ th s. F. Whitmer
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Mr. Ruble L Thomas.
George F. Trowbridge, Esquire 1
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CODE PERCENTAGE '
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P1 + Pb + Q 42.0 60 N/A Prs 12.5 N/A (78)-
63 3.
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ADS SRV (first cycle positive P1 + Pb 29.75 R/A (107) 91 peak value) +
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