ML20086K550

Telecopy AO 75-4:on 750117,core Spray B stay-full Accumulator Level Switch LS-4224 Failed to Operate on Low Accumulator Level.Caused by Binding of Float.Float Freed

ML20086K550
Person / Time
Site:	Peach Bottom
Issue date:	01/20/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K549	List: ML20086K544 ML20086K550
References
AO-75-4, NUDOCS 8401270241
Download: ML20086K550 (1)

Text

-_ __ ___ _ _ _ _ _ _ _ _ _ __UL L UG U *J I LADELPi1IA III.ECTRIC CO: PAIN Owo"

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                              , Peach P.atten Atonic Power Station                                                                 gf   d. 9'#

IJolta, Penanylvcnin 17314 Jcner.ry 20, 1975

 !!r. Jccco P. O'Reilly. Director                                                                        -bic.cs/,         w M'          ll'
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United Staten Atocic Energy Coc2ioninn #he# r ~/d Directornto of Reculctory Operationo 631 Park.Avcuuc l'ing of Pruccia. Pcnnoylvanin 19405

Subject:

Abnorr'il Occurrence 24-11our !!otification Confirning T. J. Donnghy'c phonc converr:ntion uith E. J. Brunnce , A.E.C. Region 1 Regulatory Operationn Of fice, on January 18, 1975.

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Ecforenec: Licenso 1: unbar DPR-44 Technical Specification Ecferenco: 4.5.C.2 ncport lio.: 50-277-75-4 Report Date: January 18, 1975 Occurrence Date: January 17, 1975 Eccility: Ponch Ectton Atomic Power Station R.D. 1. Dolta, Penncylvcnia 17314 Identification of Occurrence: Failure of the "B" Core Spray Stay-rull Accu =uintor level cultch LS-4224 to operate on lou accumulator 1cvol. Conditicn'o Prior to occurrenec: Unit 2 chutdo.:n for ccheduled naintencnce. . Deceription of Occarrcnce: ) During routino curveillanco testing of LS-4224, the "D" Coro Spray Stay-Full l Accut:ulator Icyc1 cuitch, draining the accunulntor failed to bring up the control rcou annunciator or operate the etny-full vent colcnoid S $ 4224. Dcoigtuttion of Apparent Cauco of Occurrcnce: Float van apparently binding.

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lRl*:.iDQYnn1W%9Cu rrm=.u l....__ The fcct that thic cuitch would-tmo-operate haa .voif'IWtTe unE6t'y T6pIMaETo'n l Incauco the nynten has been prencurized continuouoly by the. condencato trancfer cycten. During the curveillcnco testing it was found that the cccunulator van full, indicating clust the piping up to and including the accunulator had remained full during pecvious operation. Correctivo Action: The float una freed. Soveral functional tenta proved that the cultch perforced anticfactory. 8401270241 750127 PDR ADOCK 05000277 Failuro Data: s PDR tione.}}