ML18043A223

LER 77-045/01X-2:on 780916,initial Valve Design Did Not Consider Failure of T-ring Air Supply,Which Could Result in Loss of Containment Integrity.Backup Air Supply Installed & Retested

ML18043A223
Person / Time
Site:	Palisades
Issue date:	09/29/1978
From:	CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML18043A222	List: ML18043A221 ML18043A223
References
LER-77-045-01X, LER-77-45-1X, NUDOCS 7810170248
Download: ML18043A223 (1)

Text

UPDATE REPORT PREVIOUS REPORT DATE: 10/18/77 PALISADES NRC FORM366 U.S. NUCLEAR REGULATORY COMMISSION .

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[)))) 1J;nvestigation had revealed that '1:'oss of the air supply to the containment building purge ioslation valves T".'"rings would result in T-ring depress-

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uriz*ation, which in turn would render the valves inoperable, resulting

~-._.~~~~~~~~~~~~~~~~---~~~~~~~~~~~~~~~~__,J III[] in a loss of' containment integrity. This

• f'ailure mode had not been considered in the FSAR.

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LER/RO CVE~Y.E;AR REPORT NUMBER.

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o::I§J I Initial valve .design apparentl:Y did not consider failure of the T-riug air supplies. Backup air supplies (accumulators) were installed and o:::rrI 1tested by April 1978. Due to redefinition of' acceptance criteria, the air supplies were retested in August. Af'ter minor repairs, the air supplies IJJIJ '-~~~~~~~~~~~~~~~~~~~~~~~~~~~~--~~~----J

[!JI] I passed the acceptance tests.

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