ML20140F593

PNO-77-022:on 770204,reactor Scrammed When Torus Temp Increased to 110 F.Caused by Two Target Rock Safety/Relief Valves Opening W/O Reseating Until Pressure Decreased to 100 Psig.Reactor Placed in Cold Shutdown

ML20140F593
Person / Time
Site:	Hatch, 05000000
Issue date:	02/04/1977
From:	Gower G, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
Shared Package
ML20140F372	List: ML20140F369 ML20140F376 ML20140F419 ML20140F423 ML20140F429 ML20140F449 ML20140F485 ML20140F505 ML20140F512 ML20140F516 ML20140F522 ML20140F533 ML20140F546 ML20140F559 ML20140F580 ML20140F593 ML20140F603 ML20140F628 ML20140F657 ML20140F670 ML20140F689 ML20140F695 ML20140F706 ML20140F724 ML20140F750 ML20140F770 ML20140F788 ML20140F807 ML20140F950 ML20140F981 ML20140G002 ML20140G018 ML20140G028 ML20140G040 ML20140G069 ML20140G098 ML20140G110 ML20140G170 ML20140G175 ML20140G183 ML20140G188 ML20140G195 ML20140G202 ML20140G208 ML20140G215 ML20140G221 ML20140G226 ML20140G231 ML20140G236 ML20140G241 ... further results
References
FOIA-85-665 PNO-77-022, PNO-77-22, NUDOCS 8604010101
Download: ML20140F593 (1)

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februTty 4,.1977

?I2i./ilIINARY NOTIFICATION OF EVENT OR UJt'TWAL Occtrw1Gt:E--FJJ-47 22 Thia prolirainsry notification constitucca FARtil notice of :m fa n ut es P051IBLE aifaty or yublic _ inter tot e17361Iie.t ace. '1hc_ inc. t.ra t (cn pre.n:nced is na initially racsived ti::houi: v 3 rifle.n tionyg,fx2'gcc':f pa_

pni la insics11y c11 that in knorn by 11: at:aff on t'sio dr.t t.

'r'acility : Caorala Poree Coupany Estch Unit 1 (D/M 30-321)

Su'>j c c t : IN1.D9L'RTIdT 1:1cVDG;7N At 12:C1 a.m. EST, on February 4.1977 duc!13 power op:steitirra, tuo Target R:ck anfety/relir.I v.ilns opw d :md did not rearst ratJ1 the pressura dacrosned to 'i00 pei;< nt 2:00 a.u.

I;rs runctor van casuelly screucial at 12:M a.tn. uhan the to::uc tad.parature had dnerensed to 110 degne s F. Tinus coolh*; uw initiated prior to the nurm nad tha tre t s teoryc.rs':Dra ranch :2 150 degrees F. The ra.actar in bning platti in cold ehtdu.,a r.nf t a:wlysis and rspeirs .tre comylstad.

This is the third blo rac.m in uhts paet t:catl due to itiaduc .nt op.v.2--

tion of e afety/ relief (S/R) valn n. Tat: l'.c c.u ce pir,a to r m:r :- c.i ac.nd nhe of the ela nn S/R pilot valy n: tra 17/Jia 742 fo- ic.ir.tino and repa!.rs as ne C.cd. Tuo other pilot v sive.1 have: a1ra Wy i.e.:a 1+-

ape:ted. 2cacter resttre is not expected 1 efors Pcbetury 9,1977.

A prc as release.10 not plannta by f:Im lic n cau. DC, ras ion II, "

(Atiente.) rectivad notiff.c.a; ion of t* sic o :cunen:rc by 411cp*wns fro.2 the In:II incpector on of ce e.t 9:0b a.s. 1:SI tn l'cbru.ary 4, l')7/.

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