05000336/LER-1981-004-03, Containment Pressure Decreased Below 12 Inches of Water.Caused by Containment Cooling Not Changed to Match Decreasing Heat Loads During Cooldown.Containment Pressure Increased

Containment Pressure Decreased Below 12 Inches of Water.Caused by Containment Cooling Not Changed to Match Decreasing Heat Loads During Cooldown.Containment Pressure Increased

ML20003J003
Person / Time
Site:	Millstone
Issue date:	04/16/1981
From:	Clement C NORTHEAST UTILITIES
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20003J002	List: 05000336/LER-1981-004, Forwards Updated LER 81-004/03L-1 05000336/LER-1981-004-03, Containment Pressure Decreased Below 12 Inches of Water.Caused by Containment Cooling Not Changed to Match Decreasing Heat Loads During Cooldown.Containment Pressure Increased
References
LER-81-004-03L, LER-81-4-3L, NUDOCS 8105080317
Download: ML20003J003 (1)

LER-1981-004, Containment Pressure Decreased Below 12 Inches of Water.Caused by Containment Cooling Not Changed to Match Decreasing Heat Loads During Cooldown.Containment Pressure Increased

Event date:
Report date:
3361981004R03 - NRC Website

text

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60 64 OOCKET NUMOCR 6a 69 EVENT OATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h a a I Durino a plant cooldown, containment pressure decreased below negative 12 inches I

y; of water. Containment cooling was being supplied by three CAR fans in fast with l

normal and emergency RBCCW cooling. Containment temperature dropped from 103 to gi 90 degrees F.

The plant was operated in accordance with Technical Specification

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ji iOi CAR fans were shifted to slow with normal RBCCW flow only.

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