ML20086F647

Ao:On 750429,valve RHR-862A Failed to Open from RTGB When RHR Sys Being Aligned.Cause Under Investigation.Valve Opened Locally Using Manual Operator & All Flow Paths Restored

ML20086F647
Person / Time
Site:	Robinson
Issue date:	04/29/1975
From:	Mcgirt J CAROLINA POWER & LIGHT CO.
To:	Knuth D, Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086F643	List: ML20086F644 ML20086F647 NG-75-1089, Revised AO 50-261/75-8:on 750429,RHR Suction Valve RHR-862A Failed.Caused by Torque Switch on Motor Operator Being Out of Adjustment,Causing Valve to Be Wedged Onto Seat & Preventing Motor from Opening Valve
References
NUDOCS 8401030450
Download: ML20086F647 (1)

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CarcGna Power a Ught Company cre:hza r m=mw:n H. B. ROBINSON STEAM ELERIO FIANI

' Post Office. Box 790...

c BaNaville, South Carolina

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" Robinson File No. 2-0-4-a-1%e nl-

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.0 D b-Mr. Roman C. Moseley, Direc!: tor 6

Directorate of Regulatory. Operations t

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U. S. Nuclear Regulatory Couaission S~.

l Region II, Suite 818

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230 Peachtree Staet, N.Y.@:

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' Atlanta,. Georgia 30303'((

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i s.V, Mr. Donald Knuth, Director [s'

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Di.netorate of Regulatory Oy.erations U. S.. Nuclear Regulatory Comunission

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Dear Sirs l;

In accordance with Section})h)Q.6.2 of the Teebnical Specific

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'V fo116ving abnomal occurrehee 'is reported..

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!rk on Ahril 29,1W5, a planti'k '

beatup was in progress arter"altvo-week

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at 950 psig and 4197, valv{123,, with BCS pnssure and temperature At:

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• maintenance shutdovg.

ej.RHR-862A (RUST to R!R Pu=p Suetion)

,3 failod to open from the R$when.the RRR System was being aligned jf for. power operation. This: valve is in one of three auction flow M.'

paths to the RHR System, ' T61s: constitutes an Abnormal Occurrence

,d,-}r as d' fined in Technical Spec'ification 1.8.d.

The plant was main-

."f) e tained in a hot shutdown c65dition.

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.;, 7 At 1250, valve RER-862A da'eTopened lor ally using the maratal operator, and all flow paths to the RER: System were restored. Inve'stigation i'

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into. the cause is proceedin6'.

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E Mr. Neal Bender of NBC Reigulat;ary Operations, Atlanta, was informed by telephone on April 29,. 1.975..

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. Yonrs very truly, -

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PDR ADOCK PDR m.i s

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. Jack B. McGirt, Manager 1, JS.lA

. H. B. Robinson SEQ Plant

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