05000324/LER-1979-005-03, /03L-0 on 790109:RHR Pump Discharge Pressure Switch E11-PS-N020D Failed,Causing Pump Running Annunciator. Caused by Contact Plunger Stem Corrosion

/03L-0 on 790109:RHR Pump Discharge Pressure Switch E11-PS-N020D Failed,Causing Pump Running Annunciator. Caused by Contact Plunger Stem Corrosion

ML19270F482
Person / Time
Site:	Brunswick
Issue date:	02/07/1979
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270F479	List: 05000324/LER-1979-005, Forwards LER 79-005/03L-0 05000324/LER-1979-005-03, /03L-0 on 790109:RHR Pump Discharge Pressure Switch E11-PS-N020D Failed,Causing Pump Running Annunciator. Caused by Contact Plunger Stem Corrosion
References
LER-79-005-03L-01, LER-79-5-3L-1, NUDOCS 7902140179
Download: ML19270F482 (2)

LER-1979-005, /03L-0 on 790109:RHR Pump Discharge Pressure Switch E11-PS-N020D Failed,Causing Pump Running Annunciator. Caused by Contact Plunger Stem Corrosion

Event date:
Report date:
3241979005R03 - NRC Website

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LICENSEE EVLN T HEPORT

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C3 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o

2 RIIR pump discharge pressure switch El1-PS-N020D failed, causin?, a pump running annun-l ciator.

Investigation revealed sticking contacts on the pressure switch.

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10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION LER RO EVENT YE AR REPORT NO.

CODE TYPE NO.

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11. l 21 22 2J 24 26 27 28 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN A TT ACHV E N T N P R O-4 PRIVE COVP.

COMPONENT TAKEN ACTION ON PL ANT METHOD HOUd5 22 SUBv1TTED FORMdUB.

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O Pressure switch Ell-PS-N020D failure was caused bv contact alunper sten corrosion.

I The switch was disassembled, cleaned and returned to service after recalibration with-l i

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in 11 hours1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br />.

Frequency of P.T.

3.1.lP (which verifies the operability of this switch)l l will be changed from once per month to twice per month. The increased surveillance l

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frequency will help to keep the plunger free from sticking. Also, increased (Cont'd.)

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919-457-6703 PHONE.

NAME OF PREPAREn

LER SUPPLEMENT -- RO# 2-79-5 Facility: BSEP Unit #2 Event Date 1/9/79 frequency will provide earlier identification of instrument trends.

These actions should prevent similar events from occurring. Similar switches on both units were inspected and found in good condition.