05000293/LER-1979-045-03, /03L-0:on 791114,differential Pressure Between Drywell & Suppression Chamber Decreased to Less than 1.50 Psid.Caused by Decrease in HPCI Valve Leakage.Nitrogen Added & Temp Increased,Which Increased Differential to 1.50

/03L-0:on 791114,differential Pressure Between Drywell & Suppression Chamber Decreased to Less than 1.50 Psid.Caused by Decrease in HPCI Valve Leakage.Nitrogen Added & Temp Increased,Which Increased Differential to 1.50

ML19256G006
Person / Time
Site:	Pilgrim
Issue date:	12/11/1979
From:	Graham E BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256F992	List: 05000293/LER-1979-045, Forwards LER 79-045/03L-0 05000293/LER-1979-045-03, /03L-0:on 791114,differential Pressure Between Drywell & Suppression Chamber Decreased to Less than 1.50 Psid.Caused by Decrease in HPCI Valve Leakage.Nitrogen Added & Temp Increased,Which Increased Differential to 1.50
References
LER-79-045-03L, LER-79-45-3L, NUDOCS 7912270204
Download: ML19256G006 (1)

LER-1979-045, /03L-0:on 791114,differential Pressure Between Drywell & Suppression Chamber Decreased to Less than 1.50 Psid.Caused by Decrease in HPCI Valve Leakage.Nitrogen Added & Temp Increased,Which Increased Differential to 1.50

Event date:
Report date:
2931979045R03 - NRC Website

text

LICENSEE EVENT REPORT CQ,NTROL BLOCK:

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(>OC*ETNUYHEu oci 61 E VENT OATL I4 75 HEPOHT DAT E 80 EVENT DESCRIPTICN AND PROBABt I CONSEQUENCES on November 14, 1979 af ter IIPCI Valve 2301-4 was backseated to prevent its leakage I

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into the drywell,the differential pressure between the drywell and suppression

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l chamber decreased to less than 1.50 psid. This is contrary to Section 3.7.A.I.i or-n 4

Technical Specifications.

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o l Decreasing the 2301-4 valve leakane to the drvwell caused the drvwell pressure to lilil ] decrease thereby causing the drvwell to suppression chamber dif ferential nressure I

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