05000333/LER-1979-040-03, /03L-0 on 790630:during Cold Shutdown,Rhr Sys Not Fully Operable Due to Existence of Leak Flow Path Through Discharge Check Valve for Pump A.Caused by Valve Disc Detaching from Disc Holder.Repairs Are Continuing

/03L-0 on 790630:during Cold Shutdown,Rhr Sys Not Fully Operable Due to Existence of Leak Flow Path Through Discharge Check Valve for Pump A.Caused by Valve Disc Detaching from Disc Holder.Repairs Are Continuing

ML19225C252
Person / Time
Site:	FitzPatrick
Issue date:	07/23/1979
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
ML19225C248	List: 05000333/LER-1979-040, Forwards LER 79-040/03L-0 05000333/LER-1979-040-03, /03L-0 on 790630:during Cold Shutdown,Rhr Sys Not Fully Operable Due to Existence of Leak Flow Path Through Discharge Check Valve for Pump A.Caused by Valve Disc Detaching from Disc Holder.Repairs Are Continuing
References
LER-79-040-03L, LER-79-40-3L, NUDOCS 7907260747
Download: ML19225C252 (2)

LER-1979-040, /03L-0 on 790630:during Cold Shutdown,Rhr Sys Not Fully Operable Due to Existence of Leak Flow Path Through Discharge Check Valve for Pump A.Caused by Valve Disc Detaching from Disc Holder.Repairs Are Continuing

Event date:
Report date:
3331979040R03 - NRC Website

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FIT 2 PATRICK NUCLEAR POWER PLANT DOCIET NO. 50-333 ATTACINENT TO LER 79- 040/03 L- 0 Page 1

of 1

While in a cold shutdown condition, during the conduct of Operations Surveillance Test F-ST-2A titled "RHR Pump Flow Rate Test (ISI)", Operations personnel noted reverse rotation of RHR pump 10-P-3A while the other pump in the same RHR loop (10-P-3C) was being operated.

The testing was being conducted to satisfy the requirements of Technical Specifications Appendix A, Paragraph 4.5.A.3.

Reverse rotation of the "A" pump indicated that its discharge check valve was not full closed. Th ere fo re, the RHR system could not be considered to be fully operable due to existence of a leak flow path through the discharge check valve for the "A" pump.

RHR pump "A" was demonstrated capable of its required flow per Technical Specifications and RHR pump "C" (in the same loop) was also demonstrated capable of meeting its flow rate requirement wht, the discharge isolation valve associated with the A pump was c1csed.

In addition, the pumps in the other RHR loop were operational and the core spray system was also in an operational condition, there-fore, the event does not represent any significant hazard to the public health and safety.

Investigation and disassembly of the discharge check valve associated with the "A" Intnp revealed that the valve disc was not attached to the disc holder.

At some earlier time the disc stem nut retaining pin had broken allowing the disc stem nut to back off of the disc stem.

In order to prevent recurrence, the event has been discussed with the valve manufacturer to determine a more secure method of pinning the disc stem and nut.

Repairs have not been completed at the date of this repor~, however, following repairs, proper operation of the check valve will be demonstrated by performance of F-ST-2A.

NOTE:

LER 78-012,78-109 and 78-111 are related events.

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