05000333/LER-1978-109-03, /03L-0 on 781224:the a Residual Heat Removal Loop Could Not Be Maintained Full of Water Because a Discharge Check Valve Was Not Closing Properly.Disassembly Revealed No Cause for Sticking

/03L-0 on 781224:the a Residual Heat Removal Loop Could Not Be Maintained Full of Water Because a Discharge Check Valve Was Not Closing Properly.Disassembly Revealed No Cause for Sticking

ML19274D369
Person / Time
Site:	FitzPatrick
Issue date:	01/18/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19274D361	List: 05000333/LER-1978-109, Forwards LER 78-109/03L-0 05000333/LER-1978-109-03, /03L-0 on 781224:the a Residual Heat Removal Loop Could Not Be Maintained Full of Water Because a Discharge Check Valve Was Not Closing Properly.Disassembly Revealed No Cause for Sticking
References
LER-78-109-03L, LER-78-109-3L, NUDOCS 7901230254
Download: ML19274D369 (2)

LER-1978-109, /03L-0 on 781224:the a Residual Heat Removal Loop Could Not Be Maintained Full of Water Because a Discharge Check Valve Was Not Closing Properly.Disassembly Revealed No Cause for Sticking

Event date:
Report date:
3331978109R03 - NRC Website

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ATTACllMENT TO LER 78-109/03L-0 Page 1

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During routine plant startup operations, the A RilR loop could not be maintained full of water following operation of the A RilR pump. RiiR pump A had been operated to bring the pressure suppression pool (torus) level to within Technical Specification limits prior to startup.

Investigation revealed that the discharge check valve on the A RIIR pump was not closing properly and thus allowing the discharge header to drain through the check valve and pump to the torus.

In order to permit plant startup to proceed,the A loop RilR pumps were placed in operation in the torus cooling mode. This action allowed the RIIR pumps to main-tain the discharge header full and thus meeting the requirements of Technical Specifi-cation, Appendix A, Paragraphs 3.5.A.3 and 3.5.G.

This alternate system lineup (torus cooling mode) is automatically terminated and appropriate motor operated valves are repositioned for LPCI mode operation of the system in the event a LPCI injection signal is present.

When time permitted (following plant startup) on December 27, 1978 (approximately 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after the initiating event), Operations Surveillance Test F-ST-2L titled "One RiiR Pump Inoperable Test"was completed with satisfactory results. This action satisfied the requirements of Technical Specification Appendix A, paragraph 4.5.A.3.a and allowed RIIR pump A to be isolated from the A loop and be declared inoperable.

When the discharge check valve was dissassembled, no cause for the apparent sticking could be found. The valve was reassembled, the RIIR pump was tested and declared operable.

RIIR pump A was out of service for approximately 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.