ML19322B938

RO-2-79-53/1P:on 791207,recirculation Sys Sample Line Outer Valves Isolation Function Inoperable.Caused by Improper Testing of Installed Jumper.Jumper Removed,Valves Tested for Manual & Automatic Isolation & Found Operable

ML19322B938
Person / Time
Site:	Peach Bottom
Issue date:	12/10/1979
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 7912190566
Download: ML19322B938 (2)

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PillLADELPillA El.ECTRIC COMPANY Peach 19attom Atomic Power Station

. Hotra, Ponnsylvania 17314 Deccaber 10, 1979 0

0 D Mr. no yce H. Grier Office of Inspection and P.nforcement ' '

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.c j uegion'1 United States Nuclear Regulatory Coeusission n[} D g- -

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631 Park Avenue +.. yU _S,.I -a: .

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King of Prussia, PA 19406 '

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SUBJECT:

REPORTABl.H OCCURRENCE - PROMPT NOTIFICATION con fi nei n t 4 s. Plot schmann's conversation with Mr. Creanman Rogion I, United Status Nuctuur ltogulatory Commission on Decumber 7,1979.

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Refer ince: pocket No. 50-277 l Pench Rottom Unit 2

! Tuchnical Spucification Hoforeneus: 6.9.2.u(2), 3.7.D.3 l

l Heport No. 2-79-53/ IP l

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Occurrence Dato: 12/7/79 Identification of Occurrence: " .m Unit 2 r-circulation system sample line outor valve isolation function inoperable.

Appa ren t Cause of occurrenco:

Improper testing following installation of a jumper.

l l Analysis of Occurrence:

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1 A jumper was installed in the control circuit on 5/20/79 during an investigation of the inability of the Unit 2 recirculation system sample isolation valve A0-2-2-40 to open in response to a manual signal following a modification to assure electrical separation. Because the jumper restored manual eperat ton and because the individual doing the work be11oved that the

.tumper only restored :ircuit continuity, no testing of the isolation cep-hility of the valve was done. The juusper was desir logged in the jissper tog per procedure. On 12/7/79, during preparation for testEng

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of another modification this jumper was recognized to inhibit automatic isolation of that waive. However, the inner isolation valve was not affected and would have automatically isolated upon roquest. Becauso

• the innor isolation rutvo would have isolated and the outer isolation valvo could be operated manually, the line could have been isolated if necessary.

Corrective Aetion: A -

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The jtamper was removed upon discovery. Both valve 6 were tested for 4

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manual and automatic isolation and were found to I a ftally operable.

Am imunediate review was made of jumper los entrie- concoming RP5, p

ECCS, and PCIS circuitry and no abnormalities wet e found. A roview a.m4. twq4e. m .7.h w .,. 7012190' .a .34ss

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2-of the jmsper tog procedure wt11 be made to determine Lf revision is nece as.4ry .

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Imme Very truly yours,

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