ML20024C726

Site Problem Rept Resolution transmittal,13-6-183-0

ML20024C726
Person / Time
Site:	Crane
Issue date:	02/20/1979
From:	Rogers L BABCOCK & WILCOX CO.
To:
References
TASK-02, TASK-2, TASK-GB GPU-0368, GPU-368, NUDOCS 8307130128
Download: ML20024C726 (8)

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...:M the loss of power to the RCP-u =enitating circuit.'

M*J,U.

-J. 6'I

. P,"; 2..

.y regia *ered no pu=p: operatiac is "A" loop and hc===

~

" m'*:S the signal to trip the reactor.*.

... m

.. s..;.";u.s E

r c~

g.

r j*j)

.*T-[..c

.(b) Yit:1 hus 2-1Y al=s supplies Mr.=/ to the it hs.for.'

t b.f.?. '

's

, non-ni::loar instr.:mestation. hecause c.f loss o^ X

$,2@',

Lus'to N3In the electro =agsetic relief v=1ve, ~d*:-?.72,

@g%.

'*3 rec'eived an open 's==arii, which initiated a rapid,. f,,

=

f ~.j,.'y systen depresseiza. tion.

v.i

...e Q,.,

n..

?

1-;:..'.)

(c)

.'l"he electrons;;netic relief valve, Rf-RY2, 4ces net

• 2:nve

,4. %

valve indication in the control-Roc =, =o tis control h.4 '

~d.,

$J. -

M j '""

Rocca operat:r was usvare that II::-3V2 hai crened;hecce, 1 02-f the. operator did not take the remedial actis: of closi.=g.

WM

'the electro =agnetic relief valve 1:olatios v.alve, !:0-Y2.' - :.

NP

'..*...:..,Q.N.S..' j%,-

p.,.w D," y[d

' W' 'l (d) There exists' as apparant anomly in' the logia for the

• Ef*

• operation o* DaOH ta=% valvesconnectai t.s h".".".":' itses M j,

', j,

.,;3 th t feed the WJ p==ps su=tio=~ Eue to this lor,1c..

M.y Ke0H vas fed into thz =uction li=es of RJ p. ps d=ing 2-*

O

' ~

f.

. ' ].-Y the hich pres==e icicction, whi=h es:v.e4 a.fter rapid

.d

.depressurization.

p y,.

.J.': -

~

.M

,.i 3

(c) The cir=usstances which led to the deenergi:stio= cf.

.. ).7.,. s

~

vital power supply 2-1V are t:.::erates in the Noi-I,1 Reueter */ rip" Report (copy attachsd fpr referen=e).-:

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v. q.a-en.. ::.

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3}

l C1'.!/;:st-Ed era sorting the re.1ktoi probiczas as followns,

s

(( -

?.Ln : sn.-

.T

.g)

(a) The reactor butidin: i=olatiea une canlin: surveniane

-.j--

.,. g(!

l proceduro is being revistat.to the effect t!.at they do. "

7. &,.

(e: *: 2..

. # 4 mot disconnect the alternate source cf power to vital Q

. :!fj.

i @v,';.

k ses.,,

,; c.,..'.

i.

. r Q.1

• L:

s..

p.

r:.

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j (b) The logic for operati=- Na051. ant valves durinc EP

$i I. : tF -

injection is being reconsidered.

m Reactor Coelnat 1

N[,,.,;',._ }.

,:a(f..

Systas chanistry was brought ba=.k to specifientio=s...*

E j

J (c) N electrocatic fail open logic is being questioned.

]. -

J L.

kw.s...

• as v. t. /. Y' J

4

. Tom Coott of Duclear Service and Bob krris of Control '

b,:S.)3 '.

M*

.g Analysis were infor=ai. The arpsrect con =essus was d

g that.the electro =aistetic relicf. valve should not fail opea h t should fail closed. In the safety analy=is.

' O.$l h.

i 1

~

,; Q;c -

'y no credit was takes for the relieving capability. or l r '. ',

i 2

the electro =agnetic valve. The code safety valves.

~.

' ) b --

W.

czist to take care of the pressure t.assiests.

1..

1 3

On request by Ron.Toole, CPLT Test Capurintendest, a-

.W.-

M,, l.,

j j (

logia cher.ge vus suggested to C?t! after cons.t.lti=g

.( 9,y,

6 g.

Doug K ap of Isgineerin;.

A copy of C7J Problen Rem ~ 7.*.

• l b.,

. 3 * ~~

2718 is attached for refere==e.

a

.5.. :.,c

>s,

... ;,y

. 93 It vss s'.so suggested that*RC-R72 o;ts-close signal

• q*

,1

[.f.

~

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~4 status lamp be wired to operatcree=scle..F.uras & Roe '.

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i

.is workir.g on this aspect.

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4 W":T;Tt ACTIC;f Rt"0:0.T'3D E! ti"r PDtsc* 3, ~~

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7..,. ;.. -

l

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q

dify the fail open logic of C-Ry2.cn.1 the desirability of'having l:

y

f,-

g tha key =vit:h in C: cabinets at location L-51% for testing auta

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_s T.W hs revlevel the electro::stic relief valve logic.and unrees to.the.

[i.;g

.d catacept of hav1 e relief valve fall closed on loi.s of 2:*:I pu.ecr supply 1.-

0'Vfc ^ ;

..i 1

• y to the 111-l.ov Honitor b-10-12). To acJ61cve thl= corviitic:, :r;it 13 r,.1: '

.h:. ]

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y:$

gi, t f-l as lullcated in the attachc2 sketch. 'Per your' request,a fo. mal ficic.

change vill. follo.w.-

W:'. ~..y.~v., a ? '. :.,*. 9.t.h. %..,.'J';.; d e '.i.;-.6 W

W.h

_ ~.. -

.M '

• - - /-1:-w;;.

.2, 7

To provide an indication t.hnt the electrositic relief'v217e lus En o "?w: pen'.

NK.*

en:.y :

. f.., ? -.,':s

.

• s s-

.e

.rM signal, a review of the construction schc=ntic: indicaten that a costrul. '-

cht; :

4

h.,'.:

')]

'ro:ts irr2icatins. licht operated frca power to the ~olenoid.can te added..

without additior.21 a.W. (!!efer to 'ET.R drawing 13079.. sheet 1%.) ~Q

!.: ?.

' uW M."J.:

'cp This light could be :::tuated by the same auxiliarfrelay in, the po.rer,. ~..,.

j distribution pane!' that supplies.pciter to the valve solenoid.

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