PNO-III-87-146, on 871129,one Valve Did Not Perform Properly During Surveillance Testing of Msiv.Caused by Deformation of Seal Matls in solenoid-operated Pilot Valve Due to Excessive Heat from Steam Leaks.Valves Rebuilt

PNO-III-87-146:on 871129,one Valve Did Not Perform Properly During Surveillance Testing of Msiv.Caused by Deformation of Seal Matls in solenoid-operated Pilot Valve Due to Excessive Heat from Steam Leaks.Valves Rebuilt

ML20236V330
Person / Time
Site:	Perry
Issue date:	11/30/1987
From:	Forney W, Mccormickbarge NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-87-146, NUDOCS 8712040235
Download: ML20236V330 (2)

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PRELIMI, NARY NOTIFICATION OF EVEfiT OR NUSUAL OCCURRENCE -PNO-III-87-146 Date November 30 8 This; preliminary notification constitutes EARLY notice of events of POSSIBLE safety' or. public interest significance. The information is as initially received without verification or evaluation, and is basically all that 'is known by the Region III JM

. staff on this date.

Facility: Cleveland Electric Illuminating Licensee Emergency. Classification:

Company __

Notification of an Unusual Event Perry 1 Alert Perry,' OH . 44081 Site Area Emergency General Emergency DocketNo.50-44/f X Not Applicable-

Subject:

SHUTOOWN TO INVESTIGATE MSIV CLOSURE PROBLEM At approximately 2:40 a.m. on November 29, 1987 during surveillance testing of the Main Steam Isolation Valves (MSIVs), one valve did not perform properly. (The reactor was

. operating at 80 percent power.) In the test, the MSIV was closed using the solenoid-operated test pilot valve, but it did not remain closed as it should have when the control switch was placed in-the "close" position and the test push button released. This condition indicated that the fast-closure solenoid operated pilot valve did not function as designed. Reactor operators then attempted to fast-close the MSIV twice and were unsuccessful. The remaining seven MSIVs were successfully tested.

Because of a licensee commitment resulting from earlier problems with MSIV closure failures

(

Reference:

PNO-III-87-138 and 138A), the licensee began a reactor. shutdown to investigate the MSIV failure. Following the shutdown, licensee personnel and the Senior Resident Inspector observed the MISV during a third closure test. During the test, which lasted for about two minutes, the valve did not close.- The fast-closure pilot valve was then gently tapped, and the MSIV closed in the normal . stroke time (about 3 seconds). The j MSIV was intentionally opened and during a subsequent. fast-closure, closed normally. I 1

Once the reactor was placed in cold shutdown -- about 5:20 p.m. on November 29 -- the pilot j valve was removed for inspection. 1 1

lRegionIII(Chicago)inspectorsweredispatchedtothesiteandarrivedatapproximately I

' 9 p.m. on November 29. They observed the disassembly of the pilot valve and will continue to monitor the licensee's activities to determine the cause of the valve malfunction.

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DISTRIBUTION:

H. St.

NMBB Phillips E/W Willste i Ehairman Zech XE0D NRR DIX NMSS I Comm. Roberts ARM 01 Comm. Bernthal EDO AirRights Mail To:  ;

Comm. Carr PA SLITP SIg DCS (Original) M I 3 l Comm. Rogers OGC 00T-(Trans. Only)

SECY OGC-H FAX T0: .Nicholson Lane Regions I

' CA ' INPO l.* M RES Region I  !

GPA- NSAC 198 Region II  :

ACRS Licensee f. N Region IV' '

PDR Resident Inspector Region V g]  ;

HQS.OperationsOfficer/.g I  :

l Region III. H B712040235 871130 Rev. November 1987 '

B7-146 PDR

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l PRELIMINARY NOTIF1 CATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-Ill-87-146 Date November 30, 1987 l

l' The cause of the earlier slow closure times of the MSIVs was determined to be a deformation of seal materials in the solenoid-operated pilot valve, which caused the valve to stick. The seal degradation was attributed to excessive heat in the steam tunnel and dry well as a result of steam leaks during earlier plant operations. The licensee replaced or rebuilt all of the pilot solenoid valves and installed additional heat monitoring equipment prior to restarting the l reactor on November 13, 1987. There has been no indication of excessive heat since the i pilot solenoid valves were replaced or rebuilt.

l The State of Ohio will be notified.

Region III was notified of the valve testing failure at 3:35 a.m. on November 29, 1987. l This information is current as of '10 a.m., November 30, 1987. I

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t I CONTACT: IMdM-p-Barger M. McCormic r

'. ' a ney l FTS 388-5799 FTS 388-5590 ll/30/r7 i

a 1

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