ML20086K466

Telecopy AO 75-10:on 750127,incorrect Valve Lineup Following Local Leak Rate Testing Rendered Standby Liquid Control Sys Inoperable.Caused by Personnel Error.Personnel Instructed in Proper Method of Performing Test

ML20086K466
Person / Time
Site:	Peach Bottom
Issue date:	01/28/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K460	List: ML20086K457 ML20086K466
References
AO-75-10, NUDOCS 8401270129
Download: ML20086K466 (2)

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PillLADELPHIA CLECTRIC CC"i?MTY Peach Bottca Atonic Power Station Delta, Penncylvanis 17314 MMN ~

M /-- I V a Mr. James P. O'Reilly, Director

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United States Atccic l'ncrcy Co~,insion Directorate of Reculatory Operationa bk' N/[)dY" MO 4 h/4 631 Park Avenue King of Pruania, Pennsylvania 19406

Subject:

Abnoren1 Occurrence 24-Hour notification C:nfircing R. 5. Fleisch= ann'a phone conversation with Mr. Walt Daunack, A.E.C.

Rogion 1 Regulatory Operations Office on January 28, 1975. .-c , m yt .-c R';f e renc e : Licence 'iumber DPR-44 _'K Technical Specification

Reference:

3.4.A.1 h

[D' , Q *C'g q Raport No.: 50-277-75-10 M(a

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R2 port Date: January 28, 1975 'I "

Occurrence Date:

9, January 27, 1975 Li Yacility: Peach Botton Atomic Power Station R.D. 1. Delta, Pennsylvania 17314

, $I 'I Identification of Occurrence:

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i n en e ve" u-1 m ,11-.:n;- felicwinL iv. al leni rare testing vbich rendered the Standby Liquid Control Systen inoperable.

Conditions Prior to occurrence:

Unit 2%at 90'; power.

D;ccription of Occurrence:

During local leak rate testing of the Standby Liquid Control System pcactration, a nor:. ally locked open block valve was closed to acco=plish the test. Following the test, the valvo was Icf t closed and the plant was subsequently acarted up.

Designation of Apparent Cause of Occurrence:

In order to provide a valid test, the Renults Engineer approved a change to the valve lineup pe':-J t ring the packing to be loosened on the subject valvo no as to provide a veat up :tream of the cheek volve which forms one of the icolation valves. During t'a? t e.st setup, the individual anninned to the test apparently closed the valve to providd a vent path through the packing. Although+ao violated the proceduru by cloning the valse. he did hang a leak rate tout can on it. When the test vao conpleted, the valve packi33 van retfuhtoned,  ;.' b u t the valve was not reopened, locked, or untagged. Following reactor startup, the tag was observed by a aember of the plant utaff and subsequent investigation revealed this reported occurrence.

Analysis of Occurrence:

Closure of the black valve c:ade it inoo n iM c to infect the Standby Liquid. Control Synten into t.ha reactor. However, in tha wllk21'/ event that inj ection vaa required, the fafluro of the nynten to inject would have been obaarved by the reactor operator due to the t'act that the Standby Liquid Control Tank level vould not decrease. Subsequent inventigation would have renedied the situation.

0401270129 750206 PDR ADOCK 05000277 S

bog /7 rhi d o . ,. J PDR /*.3 ce c TOPY SENT REGION _d

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Abnor n1 Occiarrence 24-!!our Notification 50-277-75-10 T .-

Corrective Action:

Perconnel. involved in Local Leak nace tenting have been instructed in the proper ut:tbod of performing the tanto and r..sking test procedure changen.

A reviced LLnrfor it.plemented procedure will hw Ponc revicked and approved, and pill be future testing.

F011 urn Dstar None.

Vcry ently yours, W T. Ullrich, Suucrintendent Prach Ectton Atomic Pouer Station. ,

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