ML19322D358
| ML19322D358 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/30/1978 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8002110669 | |
| Download: ML19322D358 (3) | |
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MFairtile Attorney. OELD OI&E (4)
Mr. J. G. Marbois CEisenhut
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Dear Mr. Hertreta:
During April 1978 you inforned us of an errer la your ECCS Small f
Breat LOCA evalustion codel realyses. We authorized ccatinued operation of Three Mlle Island Nuclear Station. L' nits hos. I and 2 based la part on credit to be taten for getz::pt operator cctions.
4 You were issued an Orcer for Tit!-2 and an Exemption for THI-1 by vtitch yce were recJ1 red to irpisaent k w.4 iss and training accessary ta assure that the req 21 rod c;*ratsr actions could be cc:stette within ton micates fraz initiatica of the event. In adcition, you w:re directed to se::: sit ressalyses alcas with pro-posals for less-tam ccdtftcattoos ta eliminata the nece for prc:;rt eporator actions facluding tbse fram teside and from outside the control roen.
i Your propots) for long-tem a 4111cattens rolles on cwrator ecticas.
It appsars that *grc=pt* cporatar action ety be required. Ye have also detenir.ed that the proposed calification wouta cagrace the existing safety-rstated power supplies try introdtcing a stagle failure possiblitty via the Kirk key 1starlock actuatica circuit.
i The staff position regarding altosable cperator actions for which credit may be tat.es following a Condittoa III event (sna11 LOCA).
is as follows:
- 1. so credit for operator ectices reestred within tan ninetes of the lattiattog event
- rill be altamed.
2.
Credit may be taken for operator acttee from within the control room after at least ten minstes if eese.ata information is avall-able ans displayed, and if the ocerator has sufficient time to g5..
correctly analyze the sitaation, recogatze any errer c: malfunction and to take a corrective action. The allowed coerator cetions are limited to
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- actions which are character 1:ed by the 'pasaing p
of a button
- or the " flipping of a switch." Balancing of ECCS II w.
.ujua i. i m,..ivw rv.ii.iu m in = m aiuc cu e' 'siv i v^
vi operator action.
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Creof t may be taaen for more ctzaoles coerator actions 'mics may lie t o
The credtt 3.
be assumed to twin after at least ten minutes. assumed in the ICC i
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' eelay after f altlation of the operator action for the systes to O*
However.
f respone to assure that destga flows nave been achieved.
in less the creott for these canales actiona cannot ce assu::2t 3
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than to air.utes after the accleent.
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If the emergency core cooling systes analyses for your fa:tittits, sub-se
- 24. 1978, sittet Kay 3 and July(1) previce a new analysts and a revision of the pro-j you shoule either: posed sodification, untch altateattts the single failure capatt ill naet the thich de wmetrates that with the revised modification you ws i
(2) propose a r.:w modificattoe and an analysts.
ena of the abcte positions, identify tro position that is met and the l
basis for your statcsset.
In yccr considarattoa of the above. yes shceld be actre that me have approvee ese of tae straltfied FtW4 coce as pecposed by Sancoct 8 11,1978.
Wticas la thair letter cated Ami;tt" j
It is requested that you tafeto es by teleic.ses, c'coffreed by 10er, withis sevca dos of recetyt of this let'sse etch of the options see i
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plan to parrstra. This art 11 alica es to deternir.e unether er sst to s
continue our review of the destCs of your preposed mostf j
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d quires analysis and/or eodtfication.
1 Stacerely, 1
vas.MLu Robert W. Refd. Chfef l
Operating Raactors granch M Division of Operating Reactors t.
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'g' GPU Service Corporation Richard W. Md. ara, Prc.tect :'.ana:ter fir. T. Gary Brougnton, Safety and Licenstes ' tanager 760 Cherry hill Roaa Parstpcany, ti = Jersey 67054 t
Pennsylvania E1Ytric Company Mr. R. W. Conraa Yice Presloent, Generation 1001 Ersac Street
. Johnstown. Pennsylvania 159u7 3
111ss f*ary 7. Southers, Cnairnaa.
Citizers for a Safe Envirorn.ient P. D. Boa 4ut
. HarriSDurg, Pennsylvanta 17108 Government Pubifcations Section state 1.1trary of PennsyTwania Boa 1601 (Ecucation Butlaing)
Harrtsburg, Pennsylvaita 17126 I
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