ML20052H938

LER 82-025/03L-0:on 820416,containment Isolation Valve ECR-32 for Containment Air Particulate Detector Would Not Close During Sampling.Loose Bonnet Screws Caused Solenoid Vent to Become Blocked.Mounting Screws Tightened

ML20052H938
Person / Time
Site:	Cook
Issue date:	05/14/1982
From:	Palmer R INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052H932	List: ML20052H931 ML20052H936 ML20052H938
References
LER-82-025-03L, LER-82-25-3L, NUDOCS 8205240217
Download: ML20052H938 (2)

Text

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h IO I2l l DURING NORMAL OPERATION, CONTAINMENT ISOLATION VALVE (ECR-32) FOR THE CONTAINMENT l lo l3; l AIR PARTICULATE DETECTOR WOULD NOT CLOSE DURING SAMPLING. ECR-32 WAS DECLARED l j o ja; l INOPERABLE AT 1310 HOURS ON APRIL 16, 1982. THIS CONDITION IS NON-CONSERVATIVE l o 3 l WITil RESPECT TO TECHNICAL SPECIFICATION 3.6.3.1. l 10161 l i 10171 I l l

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l i j o l l INVESTIGATION KEVEALED THAT THE BONNET SCREWS ON THE ACTUATING SOLEN 0ID VALVE WERE g Q l LOOSE. THIS CONDITION CAUSED THE SOLEN 0ID VENT TO BECOME BLOCKED ALLOWING AIR TO BE g l RETAINED IN THE EXHAUST DIAPHRAGM; THUS PREVENTING ECR-32 FROM CLOSING. THE MOUNTING ,

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l SCREWS WERE TIGHTENED, THE VALVE TIMED AND RETURNED TO SERVICE AT 1730 HOURS ON g i ,;3l g l APRIL 16, 1982. (SEE ATTACHED SUPPLEMENT) l ST US  % POWER OTHER STATUS, DIS O Rv DISCOVERY DESCRIPTION NA l [B_jhl0PERATOR OBSERVATION l l

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ATTACHMENT LER SUPPLEMENT TO CAUSE DESCRIPTION INVESTIGATION REVEALED THAT THE BONNET SCREWS ON THE ACTUATING S0LEN0ID VALVE WERE LOOSE. THIS CONDITION CAUSED THE SOLEN 0ID VENT TO BECOME BLOCKED ALLOWING AIR TO BE RETAINED IN THE EXHAUST DIAPHRAGM; THUS, PREVENTING ERC-32 FROM CLOSING. THE BONNET SCREWS WERE TIGHTENED, THE VALVE WAS TIMED AND RETURNED TO SERVICE AT 1730 HOURS ON APRIL 16, 1982.

THESE BONNET SCREWS ALSO SERVE AS A MEANS OF ATTACHING THE SOLEN 0ID TO THE UNISTRUT MOUNTING BRACKET AND ARE SUPPLIED WITH FIXED LOCK WASHERS. THIS INSTALLATION IS SIMILAR TO OTHER WALL-MOUNTED S0LEN0ID VALVES OF THIS TYPE.

THE EVALUATION OF THIS INSTALLATION WAS PERFORMED TO DETERMINE A CAUSE FOR THE SCREW LOOSENING. THE EVALUATION DETERMINED THIS TYPE OF MOUNTING METHOD TO BE SATISFACTORY; IN ADDITION, NO EVIDENCE OF VIBRATION COULD BE FOUND.

AS THIS IS THE FIRST OCCURRENCE OF THIS TYPE WITH MANY S0LEN0ID MOUNTED IN THIS MANNER, NO FURTHER ACTION IS PLANNED AT THIS TIME.

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