ML20038C319

LER 81-040/01T:on 811118,personnel Attempted to Cycle Reactor Water Cleanup Sys Return Isolation Valve MOV-2740 But No Flow Change Occurred.Caused by Loose Valve Stem Clamp Set Screw & Clamp Screw Dropping Out

ML20038C319
Person / Time
Site:	Duane Arnold
Issue date:	12/02/1981
From:	Schmich A IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20038C312	List: ML20038C311 ML20038C319
References
LER-81-040-01T, LER-81-40-1T, NUDOCS 8112100404
Download: ML20038C319 (2)

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io is , I p System (RWCU) return isolation valve MOV-2740. No flow change occurred  ;

, ,, ,,, , during viv. cycling. Valve indicated closed with a 70 qpm flow thru the R  ;

io,3, , WCUs. The valves isolation function was therefore compromised. Tech Spec  ;

i o .. i l 3.7.D lists the operability regmts for this valve. The RWCUs was isola  ;

tair;; ted pending valve repair. M0V-2740 was returned to service within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />  ;

,o,,ii . One similar non-reportable event in which MOV-2740 would not open.  ;

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it io 1 i The valve stem clamo setscrew became loose and the clamo key dropped out  ;

ii ii i I The stem then rotated when the motor coerator was cycled without movino I tr izil the viv. disc. The key was reinstalled and the stem clamn restored to ori i li.2i l ainal confin. MOV-7740 limit switches reset. The viv. was cycled-found sa l i i t.1 I t. MOV-2740 is a a in. Anchor clohe viv. Desian Review to he initiated.  !

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QUANE ARNOLD ENERGY CENTER Iowa Electric Light and Power Company Licensee Eveat Report - Supplemental Data Docket No. 050-0331 Licensee Event Report Date: 81-040 Reportable Occurrence No: 12-2-81 Event Description During normal power operation, operations personnel attempted to cycle reactor water cleanup (RWCU) system return isolation valve MOV-2740. It was found that no flow changes occurred in response to the valve being cycle' The valve indicated closed with a flow of 70 gpm thru the RWCU system. This condition resulted in the isolation function of the valve being compromised.

Technical Specification 3.7.D lists the operabiity requirements for this valve. The RWCU System was isolated and M0V 2740 closed manually pending repairs to the valve. M0V 2740 was repaired and returned to service within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. There has been one similar but non-reportable occurrence in which MOV-2740 would not open.

Cause Description An investigation revealed that the valve stem clamp setscrew had become loose, allowing the clamp key to drop out. The stem was then able to freely rotate whenever the motor operator was cycled resulting in no valve disc movement.

Corrective Action The key was reinstalled and the stem clamp restored to its original configuration. The limit switches of M07-2740 were reset. The valve was cycled and found to be operating properly. MOV-2740 is a 4 inch Anchor globe valve. A Design Review will be initiated. As an interim measure the number of valves of similar design in the plant will be identified and a representative sample of valves will be inspected to determine if a potential generic problem exists. Additional near term corrective action will be initiated if this sampling program identifies similar problems in other valves.

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