ML17252A866

Letter Regarding a 04/26/1977 Occurrence Concerning Failure of Number 22 Main Steam Line Isolation Valve to Close to a Manual Signal Initiated by the Control Room Operator - Indian Point Unit No. 2

ML17252A866
Person / Time
Site:	Indian Point  (DPR-026)
Issue date:	09/09/2017
From:	Caldwell W Con Edison, Consolidated Edison Co of New York
To:	O'Reilly J US Atomic Energy Commission (AEC)
References
Download: ML17252A866 (1)

Text

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Re *.Indian Point. Unil. No. t..,-:u:.

_.. t.4r-.; --J:"ame a e. Q

• Rei.ll.y ~-.l>it'eQ_tor.

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.l Dire.ct:ora.te of-RegU:latoey Operationa,. Region:. ~

U., S. Atomic: Energy-Commiss.ion:

• 9-70 Broad Streat Newark., Naw: J.'e:X!s.e:y 0710-2

• Purs:uant. t.o the requirements of Se.cti.on 6. 6, *.i_ of the:

Techni.c.al.. S.pe:ci.ficati:ons: for Facili~y Qperatin*g: Lie.ens:

No. DPR-2 6, pleas:e. be: a:dv:is.ed. that-on April 26:, 19.'7.:3,,

at approximat:e 0ly a:: 30- a *. nr..., Number 2 2-Ma.in St.eam,. Line Is.elation. ValYe. f ail.ed.. t.o. close. in. res.ponse:.. to ac. mantra:

r.ta um~-----

Page. l of

• 3 WESTERN UNION.

SEND-tNG BLANK aignaJ_ in.itiate.d by* the Control 'loom Opera.t.or*..

Th.a

• s~ignal. w-as: ini.tiated:. fo~ thac purpose: of tea.ting val.v.a

.. e:loaure-time-...

At the: time: of the-occurrence*,. th.e

• react.or-vas: shutdown vi.th:. al.l. con.tro1-rods-ina:ertecf.

The: Rea.c.tor-COo.l;.an.t S:-ya.t:em.. pres:aure: and. temp~er-a.ture..

wer.a 2:2:3.S. ps::ig and:. 5:2.s.o.r, respe-ct-i.vely*, and th.e rea.c..to cool.ant boron. concentration. w-as* 1190 ppm.

With. this_

conc:enmatioJi* of bQran._and. all can-trol rods: fully-

. ins:er:ted:t th:e: re-a.c:tOr:' wa.s s:u:b:cri.t'ieal by at. lea:s,t. l.Q

percent* deoI.t:e.::. kl k.,,

. rni.tialc in.ve:&~i.g_a.ti.on. o.f the: occurrenc.~ re:vea:lecl that.

. the:. air" e-xha.us:t s.-o~l..e.noids: (two in paral.lel} failed.. to:

• trip. open:.,

t~U:

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• WESTERN UNION..

s:END IN.o: B:tA.NK.

• The: r.ema:inin:g: *t.hre.~ Main:. St.eatrL Line. Iso*la.tion:. Va:l-ve.s:

we-re-also te:a.ted and. thes:e:. re:.au:l..ta were: fatincl to. be*

• s:a..tis:fac:t:ocy-.

Rowe:ver-, it: was-note.a that one:. of the:.

air* exhaU£t-ao.l.enof.da on: bo.th. Hos., Zl and'. zq; Main::. Ste Line: I:s:ola.tion: V'aLv.es: dicLnot op.en...

t*

The. cause~- of t'l'ie,, above' de.ac:r-ibe:d__ ma.l.func..t:ions. are. unde in;ves.ti,a.t:ion:..

• We. wil.L ad.-v:is:e:. yo.a o.f... o.un. f indi.ngs:.. and. ~

co.~re:c:t-i..ve: a.ctr..on t.a:k.e*n.._

Mr.. E.lden: B.~unner.- of your* o;ffice-: was: in:forme:<L oa Apri.1-2-7, l.9~7.'3'.,, b.y, tele.phone:- oE tha_ a:b:ov.e:.. oc:c~ncalt<.

W.iliiam:. £.._

• Caldwe.ll_, Jrc *.

V'ic.e: 'fre:s id:en.t Pa1t~. 3: of. a:

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