ML19344E072

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

ML19344E072
Person / Time
Site:	Cooper
Issue date:	07/22/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19344E055	List: ML19344E054 ML19344E072
References
LER-80-022-03L, LER-80-22-3L, NUDOCS 8008260585
Download: ML19344E072 (1)

Text

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hflC F D04366 U. S. NUCLE AR KEGULATtRY COMMISSION

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J LICENSEE EVENT REPORT CONTROL 8 LOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lO T819 IN l LICENSEE 7

E l C CODE l P J R14 l 1 l@l 0 l O l- LICENSE 15 l0 10NUMBER l 0 l 0 l - l 0 l 025 l 026l@[4 l1l111l1l@l$7 6AT LICENSE TYPE J0 l

Se l@ I CON'T l 1011I  %,$ l L l@l0 15 10 10 10 12 19 18 l@l0 l6l 2l91 8l O h l0 17 12 l2 h h80 l h 74 i 8 60 61 DOCK ET NUg3ER 66 69 EVENT DATE 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o l 2 l puring normal operation, while discharging RHR to radwaste, the inboard throttle iso-i m fation valve (RHR-MO-57) could not be operated either manually or remotely. In the I 1o14l Svent of an ECCS initiation, it would have remained open. It is normally closed. Thel l o i s I cutboard isolation valve was operable. This occurrence presented no adverse conse- 1 lo16I huences from the standnoint n f nubl 4 r- homieh and enfaey- I lo17Il l 10181I I 7 e9 80 OhE CODE SL8C$0E COMPONENT CODE SUS OOE SU E 10191 IC IF lh IE__jh d h lV l A lL IV l E l X lh [F_jh @_j h SE QUE NTI AL OCCUR R E NCE REPORT REVISION L _ EVENT YEAR REPORT NO. CODE TYPE N O.

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42 l@ U@ lAl3I9l1lh 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h liloi ppon disassembly of the valve, it was noted that the seat, which is threaded into thq g )ody, had backed out and jammed the disc. Close thread tolerance should have held I m phe seat. ThP. valve is an Anchor Darlitg 4" 300#, drawing number 1655-3 globe valve. l lil31 Khe seat was replaced and tack welded to prevent recurrence. I I

til4 1 I r s 9 so STA S '.POWEA OTHERSTATUS IS O RY OISCOVERY DESCRIPTION I T lE_j h l 0 19 19 lh! MA ,_l (,,A,jhl Operator Observation l Activity CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE IiisI8 U 7 9

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PERSONNEL EXPOSURES NUYSER DESCRIPTION I ' l 7 I l0 lololh[TYPEg_jhl NA l PEaSONNE t iN;Ua'iES

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P. F. Doan PHONE:

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