ML19210F013

LER 79-030/03L-0:on 791021,while Pumping Water from Torus to radwaste,drywell-to-torus Differential Pressure Dropped Below Tech Specs.Caused by Nitrogen Pressure Forcing Water from Downcomers to Flow to Torus

ML19210F013
Person / Time
Site:	Cooper
Issue date:	11/20/1979
From:	Phillips D NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210F012	List: ML19210F011 ML19210F013
References
LER-79-030-03L, LER-79-30-3L, NUDOCS 7912130389
Download: ML19210F013 (1)

Text

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NRC FORM 366 U. S. NUCLE AR REGUL ATORY COMMISSION 1777) -*

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l'"E I L l@l0 l5 0DOCK 60 61 l0 ETl0NuveERl21918 }@l bd 1 l 012 69 EVENT DATE 14 75 30 EVENT DESCRIPTION AND PROBA8LE CONSECUENCES h o12 Durinst normal operation. while nuncing water frc~ the torus to radvaste_ the drwell o 3 po torus differential pressure dropped to 1.0 psid vice >1.47 as required by Tech. l

> l4 Epec. Section 3.7.E.2. There was no significant occurrence as a result of this I o s event. This event is not repetitive. There were no adverse affects to public healt's a 6 knd safety. I Oj7 l

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JJ J4 Jb J' 40 42 43 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS o 6 differential pressure at the high end of the allowable band coupled with pumping l lilij Fater from the torus, allowed the nitrogen cressure to force the water from the 1 3 glowncomers and flow to the torus. The differential pressure was immediatelv re- l i i brored and the instruction letter has been changed to orevent recurrence. I i 4 l r a o e0

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