ML20085A501

Ro:On 750613,power Relief Valve Actuated at 2,257 Psig & Failed to Close,Resulting in Rupture of Quench Tank Rupture Disc & Violation of Fuel Compression Curve & Cooldown Rates. Caused by Incorrectly Positioned Pilot Valve Lever

ML20085A501
Person / Time
Site:	Oconee, Three Mile Island
Issue date:	06/27/1975
From:	BABCOCK & WILCOX CO.
To:	NRC
Shared Package
ML20085A494	List: ML20085A490 ML20085A501
References
TASK-03, TASK-3, TASK-GB GPU-0489, GPU-489, NUDOCS 8307060537
Download: ML20085A501 (1)

Text

? ., n . . v a . i. < .,

p..

}' . A . .-

N,

• i ,.___

. n. i . i t,. u b l. c.id R .. . .v un i .

'(

1 i.u..t '. .w... .". .u- r .. .i ., r..

s Cusic"ER Oconce III C0!!!3ACl hD. NSS-c9 FPR H0.107 R E *i . O .  !

YENUD!! Dresscr P.'O. NO.2015CLs TASF. HD. 28 I

i

- g:10gp nc, t.1

.m-- -- SE Q. ni,:.00:

Sl1E EN31i:IER F.C.crisbaum N3.ra- " ". " U '- U"r ,rg". r." ,."*

r... .,

D. . . .' ' ' '

For info only 1

iliL'c .

J.ECTP.0&\ TIC PJ'.LEIF VALVE HALFUl:CTION .

G SC:iP1;CN OF rHCULEi!

• pars. tion to cold chatdo:n for RCP setl replacement.On DuringFricay, the t'rsnsition June 13th, from Duk l turbine to turbine bypass the primary syste-; experienced a pressure transient to '

, 2267 caused pif;;.

the The Quench power Tank relief valve accussed at 2257 psig and failed to close. This ,

r ' upture dis:

, to rupture. Failure to promptly c1csa :he

j couldc.ra rctes cud RC puaps NPSU curve. power relicf isolation valve c 8

Inspection of the power relief valve af t-

,l_ter.rr.

prevcating _ p _a the. mainr vulve t w e .n..f rpa.e,t,scatin;;. F,estrain,/

w a_ e~ e4_o a rhe l tn o na.

S!!.iUs .1.Cil0t.' Tu nhiE li@.ilulld 'Pf350: 15 C0dTACfEd .

4 JT Janis HSD, Lynchburg, KR Ellisen, NSD, Lynchburg, advised of problem. Valve has w1-:.J.1,.c be:n repaired .

v e .'im .a (6/20/75) sud reinstalled. Repair wcs effec iUnind:

1.C1l0F RECC:nt:GED bY SITE PERS0nHEt.

- . ere '*!.".thLtshd L0 rschiur t.L: M "' % ..

Sites be advised to conduct periodic inspection / operation of vs1ve to insure cperchi3f.ty.

of mociens. )(nen plant shuts down, perform manual / visual checks for freedota

, f.. .. -

u:'

1 s .s...... w....a.... va n

..,<< .:<tu.w.

t9w

• #. w- .r*. t ') en .,,. e e l p. c.n A}4.:. d!Rp^ s*s )

, . _. l ta. ,. r 71. .f . . l*

. 1

. . l fr.

_ /s2 RI h,.Lbil0h .,. .

___- _,,7.:./n; .

See further action. V j - .

1 i, g 1.PP30'/CD BY S tGilA(URE N. S. S!!LPFG t :NGigjR I

. - - - M ..,!

I

_. !, )

3._! Tr.SK ENC:NEER /M.S. UNIT ltAU!.FER!l s,

.e l

QFoi.Si!.CT l'? r.S3MCHY. T. Tulki. E.M.-

l l P.X .

l ,  ;

PP.0jEC1 J f.N,*.CEi1/ CLiftf.CT ENGINEEH ! - . . . .:

__. t .

_,i_ ,_

cCST c T::imy C.) Ennn C c 00

. , O t: Oi O YF NDGii u...._. m_

3

}.AUTH.( .. ...6 5. nn

, .e,u:r=. =,..,1i3 .

_ . . -- r

! O FIELD C!!!.HCF. REQ n em. c.v! ,.:n ;-!S .

_m., ar.:=r. ,m r.== e. :.r.=..e .w =

!! FiIE Lt:.:P' ET IJ;.' RE!"Jui r ,.:...

i 1

.. I, I

8307060537 750715 -

1

', .:d j sPDR ADOCK 05000289 not I

, .! tet i..n c O s r r .:; r w e up.

. 1

_ _ _.u "s

.. . .. . 7 ,

i. ...

a_::enE. . _ _ . .

.,. i m..... .. . . t, ,

. s. : : s. . e::p r:re, t...cm:;;.t i! ~B2J;1.18 t._, ... ....l.... i. <

- . . . . . - . - . . . . - . . . - . . . . er,rt.__. - . .- . .- . .. .

_ _ _ . _ _ . . _ _ _ . _ _ _ . _ _ _ _ _ , .____ _ _ _ _ . _ - . _ . _ _ _ _