ML20062C996

/03L-0 on 781019:during start-up,inboard Main Steam Line Drain Isolation Valve MO-2-74 Would Not Close in Response to Hand Switch in Control Room,Due to Defective Limitorque SMB-000 Torque Switch on the Valve

ML20062C996
Person / Time
Site:	Peach Bottom
Issue date:	11/08/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-78-042-03L, LER-78-42-3L, NUDOCS 7811160095
Download: ML20062C996 (1)

Text

-

~

50-277

.S Mr. Boyce H. Grier, Ofrector No. 2 h2/3L-0 Of fice of Inspection T, Enforcenent, Region i U.S. Nuclear Regulatory Comission 631 Park Avenue

. King of Prussia, PA 19(iO6 4

Dear Mr. Griers This LER refers to the failure of the inboard main steam line D drain isolatica valve to close electrically which resulted in the closing of the re+mdant outboard isolation valve in accordance with Tech. Spec.

3 7.D.2. Because this valve is inoperable, verification and recording of the position of the rednnannt isolation valve was besun per Tech. Spec.

h.7.D.2. This is a condition of operating in the degraded mode as permitted by and reportable under Tech. Spoo. 6.9 2.b.(2).

u. a Nuctsan asautarony consasissioN LICENSEE EVENT REPORT .

coNinot stoco i ! l ! ! I l catsass eniNT on tves aLL nsovinto Neonmatioon i e@ ,

esIP lavce 18uscaos 19 Is 12 l@l0 !0 l- 10vca~u lo =v=esa lo le 1 Ol0 lo lo ,s@a16lflil1lIl@

l

i. s . vcaus rves a @

covt lol'l 0

• ,3 ' ' , . " ' LL._)@lo 15 lo I- 101217 174. 1011101119171 a i@l li li 0t al 71toalg up i 60 61 oOCK E T ,.wweg e (vevr D.73 7. 7% avoA T O.rt svENT cascnietioN ANo P4o8ASLE CoNstoutNCEs h a 2 l During start up operations an attempt was made to olose the inbred main 1 o g steam line drain isolatica valve QS2-7h) usi=g the hand switcl. in the i r

,, . g control roca. The valve failed to respond. The re+mdant outboat_d isolat i p; p; j , ion valve was placed in the closed position. Daily verification and re- l gg cording of the outboard valve position was initiated in accordance with t pi Tech. Spec. 3 7.D.2 and h.7.D.2. Safety significance is minim =1 t g, Previous siniini occurrence LEE 2-78-030/3L-0. t

'EE 'los swlc'Se cowoneur coes su'sc"ocsso"Efe ITITl  ! Cl Cl @ [Ej @ W @ 17 lA lL 17 10 IP l @ A @ Z @

> e e ie i. ia n is . .

snous=n.t occueni=ca esecar aav.s.o=

. EVE't? vf.= atPonT 8to. Coot Tv et No

@ ,"te e noo',1, ,"

_l 7 l n8 l as

[--J u

l0ih121

a. .e M

si Mn as a L 8 v

LO.J 2a NN ".l'#[J cut'Nr Ta'r?.E' ouas "Ee'$.E' *E. "sw'".'t'TI ..'= IEUn'en p2aJ@LA,,j@ > a

[Z,j@ a (Zj@ v (i jj0 @10l

[NJ@ ],IJ@ [NJ@ lLl2l0l0l n n .

CAusE ofsCRepfiCN ANoCommicTiVE actions 27

. p TTI 1 Electrical checks indicattd that the Limitorque SMB-000 torque switch en t

, i i isolation valve MD-2-7h was defective. The defective torque switch will e i

l be replaced durtag the nort appropriate outage. t

. i l I CE) ' '

's t'.%Y voasa of sast.rvs @ EscEa5 c.scovaavossca.enom @

i ')

W @ l0l 1l 7l@ lnN/A I L.Aj@l Operator Observation  !

. ,y,,,,,, g,,,,, 2 - .

. u . .cn.. toc.i ....<... @

8 .<,...LZJ

@o ....<,.a tz.J l N/A @ "l 1 n/A l 1 E ..@.o.s "...

.s.o ev . ..

o.sc...no @

E 1010 lo l@LZJ@l N/A I

...so ..'t'.=J..u,c..

. - . ".e \O;/.V t i 1 .,1101010 ul@lu N7A I

'e?,', * *os[c"p'Iv$ @

g7 \

> . N/A

. LZ.j@l I

ML.C W

.. .c Nec uSE ONLY 2 , [.3 j@i n/i ///d , . _ , i siviiiiiiisii j g" ~g g '

'"""~'

7811160C#lT - """'"a ~ '

sm?5 I