ML20052G028

LER 82-012/01P:on 820226,reactor Bldg to Suppression Chamber Vacuum Breaker Valve V-26-18 Found Improperly Installed. Caused by Inadequate Procedure.Valve Shaft Realigned

ML20052G028
Person / Time
Site:	Oyster Creek
Issue date:	03/01/1982
From:	Fiedler P JERSEY CENTRAL POWER & LIGHT CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
LER-82-012-01P, LER-82-12-1P, NUDOCS 8205140246
Download: ML20052G028 (3)

Text

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/&Jnistrator of Itegulatory Operaticus reJion 1 631 Park Avenue Klfg of Prussia, Peruusylvania 19406 ITCF4: Jersey Central Power & Light Ompany Ofster Creek Nucicar Generatirq Station Docket tb. 50-219 Ibrked River, New Jenmy 08731 fan 17Dcra Ibportable Occurrence Ibport No. 50-219f82-12 L E.R 41'

'Ihe following is a prollminary report being sulmitted in ocx:pliance with the Technical Specifications, paragraph 6.9.2.a. (3) .

REPORT DATE: M.trch 1, 1982 Preliminary Igrtwal

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Peter B. ETedler Vice-PresL&2nt - Director Ofster Creek j

l Director (2) offion of Mrwyernent Informertion and IW control U.S. Nuclear Itgulatory Otmninsion m shington, D.C. 20555 NHC Ikmident Inspector (1)

Oynter creek FArlear Generatiry station Nrked River, tu 08731 l

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OYSTER CREEK NUCLEAR CENERATING STATION Forked River, New Jersey 08731 Licensee Event Repor t Ecportable Occurrence No. 50-219/82-12/01P Report Date ,

March 1, 1982 Occurrence Date February 26, 1982 Identi fication_ of _ Occurrence i Reactor Building to Suppression Chamber vacuum breaker valve V-26-18 was found to be installed improperly. This is suspected to have occurred following maintenance in May 1980. The valve shaft was misaligned with the valve operator causing the valve to neither fully open nor fully close when stroked for operation.

This event is considered a violation of Technical Specific'ation 3.5.A.4 and reportable in accordance with paragraph 6.9.2.a. (3).

Conditions Prior to Occurren_ce The plant has been operating in varitus modes.

Description of Occurrence On February 7, 1982, while conducting local leak race testing on the reactor buildlng to suppression chamber vacuum breakers, it was found that mir operated l vacuum breaker valve .V-26-18 exceeded the allowable leak rate. Subsequent investigation revealed that the valve shaf t was improperly aligned with the l cperator such that when the operator indicated closed, the disc was Actually between the open and closed positions. Maintenance records indicate that the valve was last disassembled and inspected on May 18, 1980.

Apparent _ Cause of _ Occurrence

(

l The cause of this occurrence is due to an inadequate procedure. The maintenance procedure does not provide adequate instructions on disassembly of the valve to ensure correct orientation of the valve shaf t and operator on reinstallation. Although the procedure requires that a leak rate test of the

volve be performed af ter maintenance, the results of that test did not indicate that a problem existed. Th i s aspect of the occurrence is still under investigation.

1

,reranteblo occurrenco Page 2 Report No. 50-219/82-12/C1F Analysis of Occurrenca i

Tha vacuum relief system from the reactor building to the pressure suppression t

t chamber conalets of two 100% vacuum relief breaker subsystems (2 parallel sets of 2 valves in series). The purpose of the vacuum relief valves is to equalize pressure so that containment external design pressure limits are not exceeded.

Cparation of either subsystem will maintain the suppression chamber external pressure less than its design pressure of 1 psi. Further investigation into the operability of this valve and its redundant valve (V-26-16), along with the eperability of the other valves contained in the subsystens, will be perforned to deternine the effect of this occurrence on plant safety.

Corrective Action Inmediate corrective actions taken included properly realigning the valve shaf t with the operator and performing 4 Icak test on e.he valve. This test was coupleted satisfactority on February 22, 1982.

Failure Data Not applicable.

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