ML19309F502

LER 80-022/01T-0:on 800408,while Attempting to Increase RHR Flow to Tech Spec Value Required for Dilution,Total Loss of Flow Was Experienced.Caused by Pump Not Being Vented When Flow Increase Was Initiated.Operating Procedures Revised

ML19309F502
Person / Time
Site:	Beaver Valley
Issue date:	04/22/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309F496	List: ML19309F495 ML19309F502
References
LER-80-022-01T, LER-80-22-1T, NUDOCS 8004290508
Download: ML19309F502 (2)

Text

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EVENT DESCRIPTION AND PROS A8LE CONSEOUENCES h

[Tl 71 l While attempting to increase Residual Heat Removal (Ri!R) flow to the technical l go;3; l specification value required for dilution, the plant experienced a total loss of l o 4 l flow due to the pumps being air-bound. Resin had been replaced in a primary system l 10 i s t I demineralizer and a dilution of approximately 50 gpm was expected. Technical l 1016 I l specifications require 3000 epm flow durine any dilution. When the plant is l l o l 7 l [ operated with Reactor Coolant System (RCS) loops drained to mid-span, normal i 1 o is l l oneratine flow is 1000 cpm. At aoproximatelv 1234 hours0.0143 days <br />0.343 hours <br />0.00204 weeks <br />4.69537e-4 months <br />. (continued on attached)I 7 aa 83 E CO E SLBCO E CCYp0NENT CCOE SUSC QE SL E lo191 7 8 lc Ir l@ Lx_J@ Iz l@ Iz Iz ' zl zl zl z!@ Iz l@ Iz l@

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3J 34 Jh ao 42 43 44 47 CAUSE OESCRIPTICN AND CORRECTIVE AtTIONS h lijoilThe apparent cause of the incident was that the pump was not vented'when starting i t i ;i l lto increase flow. Operatine procedures have been chanced to have an operator I iii,g l present while chancing flow in the RHR system. There have been losses of RHR flow l g l in the past because the pumos were air-bound and methods are beine investiented to l

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Attachment To LER 80-022/OlT t Beaver Valley Power Station j Duquesne Light Company Docket No. 50-334 l Event Description And Probable Consequences (continued) with RHR flow at 2500 gpm, the RHR pump (RH-P-1A] ammeter begt: to fluctuate l, and then dropped to zero before the operator could reduce flow. [RH-P-1B] was also found to be air-bound. RHR flow was restored at 1309 hours0.0152 days <br />0.364 hours <br />0.00216 weeks <br />4.980745e-4 months <br /> after several attempts were made to restart the pumps resulting in no flow. RCS 1cvel was raised to approximately 73% during the course of venting the pumps. There.was no implication to the public health and safety due to this loss of RHR flow because the temperature never increased above 81F.

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