ML20024B261

Site Problem Rept 107 Re Electromatic Relief Valve Malfunction.Problem Possibly Generic to Other Plants.Caused by Corrosion of Lever Pin,Hinge & Solenoid Bracket Resulting in Restraint of Lever in Ported Position

ML20024B261
Person / Time
Site:	Oconee, Crane
Issue date:	11/21/1975
From:	BABCOCK & WILCOX CO.
To:
References
TASK-03, TASK-3, TASK-GB GPU-2346, PROB-751121, NUDOCS 8307080117
Download: ML20024B261 (7)

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is the status and/or resolution of this SPR on other contracts.

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s CUSTOMER Oconee III CONTRACT NO. NSS-09 SPR NO.107 REV.ND.

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SilE ENGINEER F.C.Crisbaus ye info only

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illLE ELECTROMATIC RELEIF VALVE HALIL*NCTION bf... fa y. ;."

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j On Friday, June 13th, Duke reduced power to 121 FP in pre-

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DESCRIPil0N OF PROBLEN

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paration to cold shutdown for RCP seal replacesient. During the transition from da Q'fcg,

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";D turW= to turbine bypass the primary system experienced a pressure transient to 226? psQ. De power relief valve actuated at 2257 psig and failed to close. nis cause.;.the Quench Tank rupture disc to rupture. Failure to promptly close the

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'M power relief isolation valve caused violations of the fuel compression curve, p,4 K,3 c ~<

cooldown rates and RC pumps NPSit curve. Inspection of the power relief valve af ter shutdown indicated that the pilot valve lever had remained in the ported position 4'

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Dreven}ing}he.krmain valvTeirie reseating. Rest {ainf >o{' thp lever was caused by

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SI AluS - AC110h 10 DAIE thCLU0thG P5'iSGNS CONIACIED JT Janis,NSD, Lynchburg, KR Ellison, NSD, Lynchburg, advised of problem. Valve

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has been repaired (6/20/75) and reinstalled. Kepair was effected by increasing the clearance for the lever pin in both the solenoid bracket and the lever hinge beari ng vere refurbfe5cd en achieve e t c' t

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,-A fuRTHER ACil0N REC 00Eh]E0 BT SITE PERSONNEL Sites be advised to conduct periodic inspection / operation of valve to insure i

operability. When plant shuts down, perform canual/ visual checks for freedom

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d INSTRUCTIONS FOR PDS-21091 - SITE PROBLDi REPORT

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6 Electrcutic T.clief Valve Malfunction July 15, 1975 s g.:7 t

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Diatribution

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L. C. Rogers

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E. L. Logan 7 ^

J. A. Bailey

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C. E. Mitchell R. J. Taker

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C. A. Creacy Q

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Referenes: 620-0009 Str.-107 Electronatic Relief Valve m1 function" -

y Attached

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-..c. c. y The attached S*R documents a problen which resulted fro.a corrosion of the lever pin, lever hinge and solcr.oid Lracket of the subject valve.

i Please advise your custerer to conduct peric' die inspections for presence of corresien products and to perform r2anual/visum1 checks for freedom of a.cticn during plant shutdowns.

...u C. A. Creacy is requc ted te verify with~ t* uke that they intend to cdopt a 3.

o surveillt.nce inspection pregre.n on thi.s valve for all three units.

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I SITE INSTRUCf!ON NO.G7, M,jf[f L %g/[J K. R. T111 son 1

R. A. Covers J. D. Phinney I?l5TnitOT10N. 260VII T. C. Crisbaum

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