ML19225A180

LER 79-060/03L-0 on 790613:containment Purge Isolation Valves Had Excessive Seat Leakage.Caused by Improper Seating of Valves.Adjustments Were Made

ML19225A180
Person / Time
Site:	Crystal River
Issue date:	07/06/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19225A175	List: ML19225A174 ML19225A180
References
LER-79-060-03L, LER-79-60-3L, NUDOCS 7907180524
Download: ML19225A180 (2)

Text

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SUPPLEMENTARY INFOR"ATION Report No. 5 0-302 / 7 9-060/13L-0 Facility: Crystal River Unit 3 Report Date: 05 July 1979 Occurreice Date: 13 June 1979 Identif ation of Occurrence:

Combined containment leakage rate greater than the limits specified in Technical Specification

3. 6.1. 2. b. , and , containment penetration inop-erable contrary to Technical Specification 3.9.4.C.2.

Conditions Prior to Occurrence:

Mode 5 cold shutdown.

Description of Occurrence:

It was discovered during the performance of the contain=rce leakage test types B & C SP-179, tha'. the containment purge isolation valves ARV-:A & 13 had excessive seat leakage.

It was later determined on 19 June through the discovery of a calculation error, that the leakage had exceeded the combined con-tainment leakage rate limit of .60La allowed by Technical Specifications. Maintenance, performed upon initial discoverv of the leak-age reduced the ccmbined containment leakage rate to within allowed limits 16 June 1979.

Designation of Apparent Cause:

The cause of this event is attributed to im-proper seating of valves AHV-1A and AHV-13.

Analysis of Occurrence: Core alterations were made prior to determi-nation that the combined containnent leakage rate was outside Technical Specification limi-tations. No effect upon the plant or general public as the plant remained in a safe shut-down condition.

Corrective Action: A shim adjustment was made to the pivot point on AHV-1A. Adjustments were made on the seat-ing edge and the torque arm of AHV-13. The adjustments to both valves reduced the leakage rate to within allowed limits. A procedure revision to SP-179 has also been implemented to clarify the calculations.

Failure Data: This is the first occurrence of this type reported.

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