ML20126B848

RO 50-336/80-05:during Safety Analysis Review,Found That Analysis of Boron Dilution Event Incorrectly Assumed Full RCS & 1% Shutdown Margin.Not All Possible Situations Considered.Will Maintain Excess of 2% Shutdown Margin

ML20126B848
Person / Time
Site:	Millstone
Issue date:	03/12/1980
From:	Opeka J NORTHEAST UTILITIES
To:
References
MP-2-4317, NUDOCS 8003200491
Download: ML20126B848 (2)

Text

e y 5.

p -

W'"Y ngP ?A7N tts 31 :s'.r p. m

. w .-s ,

3- . ,. ...

%. nr i

1 March 12, !Wo

v. t. ,* . :ir-1 l

. ... ,-o ..,0..,,  ;

n ,- ., . . e _ .. ; , . i i

??

• r ' .3 -e t* T e g et a *

• • 4,g .t f f.*

C [fi??: **"rt l'

...r~., " , ., p , ; . : .. , c .,,- - , n ,

1 r e.,, 1,r e n u e, l V > >+ v ne "rss-,e4, 6'e nre s v ,f v,* n F.) i ti't h rg forence; rae IT I ty operat'ry t f cense No. T1PH-65 Eksr>c t %. %n.)JG Hmortahie Oce. #rrenca Sn~33fi/ 80-05 pe.ir Mr. Grter:

Yh t- ret eer perrv t s en ~ ti f ic., t h", st r Rettn re:st, t e Pr en trence nry n*;

t-r"" ant to tha r+te !*m-n ts af t'll is Nne ""it C Tar bn ic a l Ses c. f f t- l c2tiane. ?a c t 'on 'i. ' . T'. fl . S . Th8" -aterr t conc >.rns tha if acaver of l

.+ n frcor eet :v.yer p t #qn in t h e. e .s #a ty anai v't i , Pha t ersiglel have r *~~ t > tea re v. tor nn e rM. ton I,n n ~nnn=r 1r.m ennser ni tyn than n 5 u r~4 in t.he analysis, f***ian a. -=viaN SP the Safef;y analy3J3 Teh3<ffcqvneed 3 t.hq f; nn inctierect sst4rmpt ion hart been eneta in th an=fvtis of tha bornn

<fffutson avcat. T5n analyefa n f th i s av an t 4 6 3

• In N a (col et N +any,) haa e- mn--a 3 ei,1r en.c+<,r <-notant sy=t.<-r sn<f a f i s h's trism

-ar,+n, tw . re. t t a! s n = un. en t-c w ca n teat n+ ni m um tc*,

Mi f r b a..if,it (!<=f Phr r matIrev=wmnt

1. <v r th? I '* a t ens I * .9w i mua. **~e M 'r 'N t'"*'i foe t he f tp?"* se t n rt t<> r et.ryyrst r e f. hse s i tte n t. In 1 .a n 't t4p M f-t, f on , f 4rn.mv p t , th= innelysi? hM tmt retm fvferref the firi that ope rd t Inn is wss ilf b wi th the rear. tor < mient *:v.9=- 'tra t"est to . ..._

th* cantar1 ?q= of tJ1e Prat I?q.. Includtm) this revfocad vol'ea of _

ranet*'r ennian* to P= dflittM in *he noeiy* is raatti t s f n a t*1e to reech r.riticality of Tess than 1G r inutes.

j4ool s

/!/

-800N"%/

v w .

e )

. W  !

i

. - .a \

l I

- :t . 6gs e, ** f t . 4 ,. .

. . , , roar v , a i * . . , ,. ,.%-,,,,

e . ,.. /

Rv fnerti.u tna the r%, r r <4 e.j erte turn in i n "**'a e, eq ?t. n tinc '

t<* creeic.=11tv of gr.= ear th n 19 ministas H r** oahlIshad. IM til i

+H, nerossary reenecar Snorest<etten @ncu?sem % narrrrved, the  !

"eit wili adminhtrat fvaly r a f ntain a Wetdt w9 m enin in arcass of 24 in r*Ma 5. Tn tha n=st it w- tasan ston farit practica in ==tntain the M<W 4 estd en Peron cone *atration re<iu treant A lle in Pode

' S ,~ W. FW crov i<fe< hison4Mc as werencA f.hk.s qsaf.ee th4n U -

T ' N , . .

. mNitd'rva meg 1 i % f=en rw inta inet durine pminus nwt* C oparstion.' . .~, j.'. - -

k y rn? s.e sn+nre..e s.,n w5 t 1 ?>n o#>w *rf M H'v% wn uns resmrt. .

vn., n y na v.. -

No.1tTHU57 .N?Ir.t. rt o: . ENE.v,7 C{>'iSN  :. - j

. ..:. l 4

/-<2.-

o

.. F.' Orreka Statf oe Renarfntentfent Ptf1)storwt Pfuelear Power statf9e JFfJ/PG/1fs cc: Of rec. tor. Office of tianagaewnt Informtion and Program Contral, Weshingt'on, D.C. (2) 9e ,'

+

y f

, a- I .

t ,

et .r -

./ , A '. 6 e a m.4 n 1 A 4

• ). .' ,

4_ 6

.