ML20049A605
| ML20049A605 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/12/1981 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-2-81-34-1P, NUDOCS 8106180277 | |
| Download: ML20049A605 (2) | |
Text
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M PHILADELPHIA ELEC"!RIC COMPANT 1%ech Boi.com Atomic Power Station Delta, Pennsylinanir.
1731k June 12. 1981 W. Boyes E. Grier Office of Inspection and Enforcement Region 1 (Asited. States Nuclear Regulatory Commission.
631 Park Avenue King of Prussia,.PA 19k06 1
SUBJECT:
REPORTABLE OCCURRENCE - PROMPT NOTIFICATIDE United" States Nuclear Regulatory Ccuatission on 6/12/81. Confirming J. E. Winseuried's couvers 1
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meterence: Docket so. 05o-277/278 Poech Bottom tJaits 2 and 3
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6.9 2s(9) b-1 7 1981 * \\
Technical Specification
Reference:
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amport so. 2-81-34/1P 3:
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Occurrence Date:
June 12. 1981 N
Identification of Occurrence:
/'lg During the Safe Shutdown analysis four cables in each unit were identified.
which were improperly designated se non-safeguard. and improperly routed.
Condition Prior to Occurrence:
Unit 2 - Critical on range 9 of IRM k50 psig.
Unit 3 - Dettaeled for major outage.
Ah R Cause of Occurrence:
Improper designation of three cables associated with the power supply to-auxiliary control relays of the room eccler fans for RER, Core Spray, HPCI and BCIC pump rooms.
Analysis of Cs,_-.mece:
During the design phase of the Peach Bcttom U~ its, an error in destsnating the a
bower supply cable to the roost eccler fan auxiliary control relay cabinets
. wee made.
l'his was identified during a design review of cable routing initiated as a result of an investigation with respect to fire protectice.
The four cables involved were origin =1Tv considered non-safeguard and routed secordingly.
There are four cabinets containing the relays for.the automatie start feature of the tsas.
The cables to the A., C 4 D cabinets are routed in separated cable trays.
Hoverer the B cable is in cable tray shared. with.
the A cables.
By operating the 3 fans In the run mode, the auto start-feature is no longer required and a firs could no longer affect more than one BER or core spray pump roent cooler.
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8106180 W
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4-9 cc...ctive Action:
As an 1 Mate corrective nem the fans for the B IGR, B Core Spray and HPCI room cooler will be operated continocusly in the run mode.
Engi w ring design changes will be made to wet ther designation sad routing deficiencies.
~
Previous Failures:
7.at. 2-79-1/IP dated January h.17T9 m 2-79-10/IP dated February 26,.1979 Very truly yours.
W. T. IIllriett,. Superintendent Peach Bottaa Atomie Power Station.
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