ML20136B948

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Trip Rept Re DB-1 770924 Abnormal Occurrence Concerning Loss of Feedwater Compounded by Two Single Active Component Failures
ML20136B948
Person / Time
Site: Davis Besse, Crane  
Issue date: 09/24/1977
From: Mazetis G
Office of Nuclear Reactor Regulation
To:
Office of Nuclear Reactor Regulation
Shared Package
ML20136B924 List:
References
TASK-TF, TASK-TMR NUDOCS 7909130151
Download: ML20136B948 (13)
v • d • e


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L C'.'d t L E. 'N E

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,4 Docket No. 30-3'46

...,, m. ma Lic2nse ::o. ::?F-3 Se rial :*o. 503 "ay 18, 1979 Dir+ct.ir of '!aclear 7eacter %a3ulat'an A.t t e n t icn :

"r.

Robert N. ?.eid, Ofef Cp.eratf.g 7 aactars 3 ranch ' o.

5 01tision af 0;= rating ictors United St ates '!oclear ?-asuisto ry Cc..a'sa kn

'.laching ton, D. C. 2 055 5

u r :4r. N id :

In tccor hnca s' th Tola io :'dd son's 12tte r of hy 4, 1979 (2arial ::o. 300),

a reviw of cha ? apt:-der 24, 1977 avant at t* e wis-3es se ':.: clear T'.wer Stat'on Ca.it 1 is attached.

Tours iety tculy,

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'!2y 13, 5 79 Sept

.ta r M, 1977 Event ?ait;v A trin; Lent alth scce ::,iailarities to the Bree 'lila Isicad (C!i) i n ei.' in t of

" arch 23, 1979 occurred at D3-1 b ring the early phins of :he testing pr:; ram.

A ec.nplate descripticn of the Septc: ber 24, 1977 c.sint

..a c ar n ir.; tha deprcsturi-ation of the primary systaa ets pruentad in tha. gpla ant tg '.;;ortable Occurrence :;?-32-77-16 datc-d :'cv: ber 14, 1977.

Tiis 2.

at 28 siallar to the 01I lacident in t'ut the c; it as ';ittai.ed by a Icus of f wd* ater rcsulting in a reactor ecol:nt s/st 3 (V3) pr u;ute sucae which c;uned the pcvar c;cratcd r<slief valve -(.'0 V).

Tae iO:V fai'."d ;;*n, causf.g 1 Ms of coolent and cociant pressure with n.e co !di:.3 in the sCS, ud a sub sq a c incruse in irdic it.ed pres;uri:er 1. val (charse. :cist'.c if a luk in the tcp of the ;cas,urizer). As at T-1I, the c;.trators initially f11'ed t,o raco;nica the c';en FCT(V and '< hen.;.ressuriz.a. r lavel nart. ad ir. : m' :; as te.i d s o.ff the h'.3.. prav ure 'c. %.ti a.n n;n.

.cVe c?uc' a -he.c;S, the

........ t.o r s s i.u.t h

.- l/

pera.

. y,,,,

Unlike hrae :411e IJ1and, hcuever, the ravis-Zere 1 ;e ra t o r ; q,:r.;n ' ::j_the o;e.n TOAV in a relatively @ r* e',e (2,.;r2.'.ttely by 21 rir.ut>s) ad re;; - fcd pro;arly by closing the block nica 2nd syb im ant ':'

U Y ? - -m u r.e -

f r.j a.: t ' en < '.c g.

In the 23-1 inci ? at, t.o ru:taar :c.:l 'nt p'.; s c::e tr'.; pad to 71 ?uca the syst i a heat,f.;ut -.d

.e ;:act,r r::lant -..; :er '.:cp.

.s H.n t a f"/;l i

n.. ura t ' m.. r " : P.cu t the inc!

it.

Da '. css of feed later as caurcd

  • y a qur'cus t ;ip of c'.a ;t i te c.d fin: ter ruptura e.at rol Jystaa (SF7.CS) casulting in a icss of fee-d t a :ne t:.a pner.n:or rich a Absequent full SFES trip :n lov at.'m 7,ener.: tor ic.s1.

-'.e full S H.CS trip etc;;ed aormal feed to both pr.erators and initiit+d the cu:<il' 2:y fem? iater

( AT1) a y S t en.

30 th t rains. o f t h e AF'1 s t a r t.= d. % t co l.v m a ' mi 4ts *: wia r nt I

~~ -- *

tu.m r.arato.r.

The erher ::;er' need a :alfuncticu of '.ha pve;.or shich 'sopt i

n-3 taa m.nliny faed erter pap turbine at a speed 1.a,ufficieat *: o. :.;.ater to its

.sr.cciated ;t ac.::a 3cna rator.

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'??-3 C..r i a l '!o. 303 "ay 13, 1977 Further cd!.ficaticas vore nade to ic. prove tha calia'attity af the M CF. and AY9 1s a result of c:pecicac e ;2ined during the test pre;-c. 3; W:;a c' :.g as inel;ded the follcuing: the high prucuco taps of the S73CS pcm:ca dif facantial witches

' ere ic nd to re'uce spurious trips of the ':BCS c uced by pe rtur$'.t'eas in.:ain f > :-du iter line ;.res sure (we 'Lachly 7.cpurt of Cetober,

'-)73, w. ury of ccapleted

? icility c'unge ?.equests, 7 7-424). A spring was lastallad in each m/.iliary fcab.c.tcr 3oca rnor to pcevant ;;he closing of the ow/aa.or /al/ :s d ie to vibrat '.n

& c'ag pl.at operatien (3ee Miual ? aport f,r 1977, y of e ;plared F.cil!.ty Change Nguests, 77-M0).

Tae ral.ys used in the nc.:fif ary ~ ud pu -p turbiae sp ad ccatrol circuitry soc 2 replaced with tot *.er ta: js ' e c:se of. Gested

~ 211ucas of ;.he ori.;'nal r:1:.ys (ne " nthly ' spurt af " w h, 13 7 3, e c ity o f i

, r plated Facility chango ,2qu wt s,77-221).

!adication :a tha

<c' i? cal lir*m3e 4

  • a pilot vnive for tha prG.V e.ts adlod to provide the ;; a c ite r % t t ar 5 :1*.us of tha ;;;1.1:n of tha pO.V (.7:)cility Ch an3e 'iquast 77-351).

T.e k; p. tar 24, 1977 cvent has a;2in. w cr/ie.ad to detamine if 2ny a?!1t'. *nl

. :ncerns ay.ist ~hich uculd not be covered by t!.e.'.ngas currently 'a'a; pre ; rcd to, sci;fy the require. ints of : 3C ?ulletins 79-05,70-05A, ad 79-033.

o v:dit!.:/11 ita::s of cc,ce cn. ara 1!antified. Along with *.he p coc a ' a al c.d e, 'p-nat :difie st icus ale t idy made as a casult of t'.e M. ta 3.21:a ?*ucl ur ? er

'- 3 t s: t i-: s J a r 7" d cq, t*n i t I t; isiant,' the c'ditire.a1 p idalfr.u, tacludic; r

aimin'ag ; o;ar 3.r.S pcw: 2 u r e / U r.; e r itu r e

ndit'c,s and '.c e y,* g.'. 3h p
uce injact!cn, pr n! dad all the jrcee lural aub!'.nca n-.

mry for caping 71th

[

t' a :cidit! bas of the 0.:pt: Se r 24,1977 ovc at,

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