ML19339C873

LER 81-006/03L-0:on 810108,water in Common Recirculation Line on Refueling Water Storage Tank Found Frozen.Caused by Heat Trace Circuit Thermostat in Off Position.Thermostats Set Immediately & Line Thawed

ML19339C873
Person / Time
Site:	Beaver Valley
Issue date:	02/06/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339C872	List: ML19339C871 ML19339C873
References
LER-81-006-03L, LER-81-6-3L, NUDOCS 8102120178
Download: ML19339C873 (2)

Text

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1. C.rt EVENT CESCRIPTION ANO PAC 8 A8LE CCNSECt.JENCES h l ITTT] l With a reactor start-un in progress, a surveillance test was beine performed on the l

head safety ininction pumps when the water in the common recirculation line on l ooTr} l 1o9 In accordance with Technical 1

' ITITI Ithe Refueline Water Storace Tank was found frozen.

i 1850 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.03925e-4 months <br />. The l t

lo t s j l Specification 3.5.3, both pumos were declared inoperable at j

I o is 1 I emercenev core cooline flow path was unaf f ected bv this hiockace and the hich head lTITl Isafetv iniection ou-os were available. The health and safety of the eeneral oublic l l

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se l 2Nl@ sa .7 12  :< u CAUSE CESCRIPTICN AND CCRRECT1VE for the ACT1CNS frozen line h was found in the OFF position.;

l i j o ) l The heat trace circuit thermostat i==ediately and the line thaved. At 1048 hours0.0121 days <br />0.291 hours <br />0.00173 weeks <br />3.98764e-4 months <br /> on 1/9/81. I gi The thermostats were set i

An investigation of other safety-related heat l Iii2i Ithe pumps were declared operable.

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[il3l l tracing was initiated and their operability verified.

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Attachment To LER 81-C6/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 To alleviate further heat tracing problems, the following actions will be taken:

1. Assign an individual to coordinate the identification and resolution of heat tracing circuit problems.

2. Identify and resolve alarm and control circuit problems associated with the Refueling Water Storage Tank and piping.

3. Monitor identified heat tracing circuits daily until confidence in the operation of the circuits is established.

4. Re-evaluate the type of heat tracing being used. .

5. Improve the procedures dealing with this type of equipment, including drawings and lists of circuits.

6. Verify and, if needed, reset alarm setpoints on circuits.

The assessment of these actions will be submitted in a follow-up report.

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