ML19337B604

LER 80-022/03L-0:on 800629,during Normal Operation,While Discharging RHR to Radwaste,Inboard Throttle Isolation Valve RHR-MO-57 Could Not Be Manually or Remotely Operated.Caused by Seat Jamming Disc.Seat Replaced & Valve Ordered

ML19337B604
Person / Time
Site:	Cooper
Issue date:	09/12/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19337B598	List: ML19337B596 ML19337B604
References
CNSS800555, LER-80-022-03L, LER-80-22-3L, NUDOCS 8010070491
Download: ML19337B604 (2)

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N Rb' FORM 366 UPDATED REPORT U. S. NUCLEAR CEGULATGY COMMISSION 1 (7 77)

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h L_L2j o puring normal operation, while discharging RHR to radwaste, the inboard throttle iso-j ioIai lation valve (RHR-MO-57) could not be operated either manually or remotely. In the l 10141 avent of an ECCS initiation. it would have remained open. It is normally closed. The l M huthoard isolation valve was onerable. This occurrence eresented no adverse conse- 1 Ia16lgnon,... penm es, .conann4 n e n p nus14,. k,,1,w ona oorney_ l 10171 1 I 10181 l l 7 $ 9 UO SYSTEM CAUSE CAUSE COMP VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCODE lol91 l Cl Fl @ lB l @ l Al @ l Vl Al Ll Vl El M @ W @ W @

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JS 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I i i o 1 Upon disassembly of the valve, it was noted that the seat, which is threaded into thq liI'I body, had backed out and iammed the disc. The valve is an Anchor Darling 4" 3008 I f Tn tirawing number 1655-3 globe valve. The seat was replaced and tack welded to prevent i LLJ._ ] frecurrence . The vendor was not aware this valve was intended to be throttled. A mod-l i 4 lified valve has been ordered and will be installed in place of the existing valve. l 8 3 80 STA '. POWER OTHER STATUS 015 0 RY DISCOVERY DESCRIPTION W W@ l 0 l 9 l 9 l@l NA l lA[@l Operator Observation l A TIVITY CONTENT RE L E ASE D OF RELE ASE AMOUNT OF ACTivtTV LOCATION OF RELEASE 1 6 @ {y,,,j@l NA l l NA l 7 d 9 10 tt 44 45 80 PERSONNEL f XPOSURES NUMME R TYPE DESCRIPTION I' TTI I 01 01 01@l ' '

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NAME OF PREPARER P. F. Doan PHONE:

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