05000336/LER-1980-030-03, /03L-0:on 800812,during Routine Operation, Containment Air Temp Exceeded 120 F.Caused by Svc Water Temp Control Valve to Reactor Bldg Closed Cooling Water Heat Exchangers Being Set Too High.Valve Readjusted

/03L-0:on 800812,during Routine Operation, Containment Air Temp Exceeded 120 F.Caused by Svc Water Temp Control Valve to Reactor Bldg Closed Cooling Water Heat Exchangers Being Set Too High.Valve Readjusted

ML19343A226
Person / Time
Site:	Millstone
Issue date:	09/08/1980
From:	Harris J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19343A219	List: 05000336/LER-1980-028-03, /03L-0:on 800811,at 100% Power,Control Element Assembly 41 Dropped from 180 to Zero Steps.Caused by Faulty Jumper Cable from Refuel Disconnect Panel to Reactor Head. Power Reduced & Assembly Realigned.Replacement Planned 05000336/LER-1980-029-03, /03L-0:on 800812,during Surveillance Test on 12 U diesel,125 Vdc Ground Alarm Received.Caused by Frayed Insulation on Wire in Bendix Connector Allowing Contact Between Bare Wire & Connector Shell.Wire Recovered 05000336/LER-1980-030-03, /03L-0:on 800812,during Routine Operation, Containment Air Temp Exceeded 120 F.Caused by Svc Water Temp Control Valve to Reactor Bldg Closed Cooling Water Heat Exchangers Being Set Too High.Valve Readjusted ML19343A218
References
LER-80-030-03L, LER-80-30-3L, NUDOCS 8009160469
Download: ML19343A226 (1)

LER-1980-030, /03L-0:on 800812,during Routine Operation, Containment Air Temp Exceeded 120 F.Caused by Svc Water Temp Control Valve to Reactor Bldg Closed Cooling Water Heat Exchangers Being Set Too High.Valve Readjusted

Event date:
Report date:
3361980030R03 - NRC Website

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l0lt1 7-8 60 61 DOCK ET NUM8 ER 68 69 EV ENT O ATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND pro 8ASLE CONSEQUENCES h Ioi2l l During routine power operation the containment air temperature was found to be in excess l -

i o l a 1 l of the limit of 120*F as specified by Tech. S'pec. 3.6.1.5.

The service water temper-

.l l o 14 l l ature control valve to Reactor Building Closed Cooling Water (RBCCW) heat exchangers wasl loIsl I found to be set too hich.

The temoerature control valve required adjustments to lower i lolsI! containment temoerature to less than 120*F within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. Maximum temoerature was I o l 7 I i 120.4 degrees.

Similar events

LER 80-03, 78-31.

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