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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l 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.

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

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:

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 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

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 x . h,

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