ML20009C164

LER 81-027/01T-0:on 810508,plant Shutdown Upon Discovery That on 810505 More than One Filter Sys Had Been Removed from Svc for Maint.Caused by Failure of Procedures to Reflect Tech Spec Requirements

ML20009C164
Person / Time
Site:	Crystal River
Issue date:	05/22/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C160	List: ML20009C159 ML20009C164
References
LER-81-027-01T, LER-81-27-1T, NUDOCS 8107200336
Download: ML20009C164 (2)

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tiei!I banks A.B&C. Lack of clarity in MP-106, relative to T.S. requirements led to per-(, ,-j t.formance of mainten nce on.all three banks without sequential post-maintenance testj, j ing. Bypass leak &ge was excessive for initial post-maintenance testing.

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e SUPPLEMDITARY - INFORMATI0r Report No.: 50-302/81-027/0lT-0 Facility: Crystal River Unit 3 Report Date: May 22, 1981 Occurrence Date: May 8, 1981 Idsntification of Occurrence:

More than one Auxiliary Building exhaust ventilation filter system removed from service for mr.intenance contrary to Technical Specification 3.7.8.1.

Conditions Prior to Occurrence:

Mode 1 power operation (100%).

Description of Occurrence:

During performance of SP-187, Auxiliary Building Exhaust Ven-tilation System Testing, it was discovered that on May 5, 1981,

• three Auxiliary Building filter systems were rendered inoperable by removal of cells for replacing charcoal canisters uJed for surveillance. Each system should have been determined operable prior to proceeding to perform maintenance on the uext system.

All three systems failed the flow bypass test. At 1600 it was recognized that Technical Specification requirements had been exceeded and plant shutdown was initiated as required by Tech-nical Specification 3.0.3. The Reactor was tripped at 1654 to comply with the one hour shutdown requirement. At 1800 on May 9, 1981 operability had been restored to three filter systems and the couldown was secured. Full operability was restored at 2219 on May 9, 1981.

Dasignation of Apparent Cause:

The cause of this event is attributed to fallare of the charcoal to pass the flow bypass test and failure of the controlling pro-cedures to adequately reflect the Technical Specification require-ments.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Corrective Action:

The charcoal was replaced is all three systems and post =aintenance tests were satisfactory. A review of the controlling procedures has been initiated and revisions will be made to assure conformance to the Technical Specifications. Training des been presented to appropriate plant personnel on the Technical Specifications involved.

Failure Data: This was the first occurrence of this type and this is the thirteenth event reported under this Specification.

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