ML19257A708

LER 79-008/03L-0:on 791210,charging Pump a Taken Out of Svc Due to Observed Leakage in Discharge Manifold Area.Caused by Valve Seat Failure Possibly Resulting from Normal Fatigue.Valve Seat Replaced

ML19257A708
Person / Time
Site:	Point Beach
Issue date:	12/27/1979
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19257A707	List: ML19257A706 ML19257A708
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 8001070416
Download: ML19257A708 (2)

Text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7-77)

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? 3 60 61 OOCK ET Nuv8 ER 68 69 EVENT DATE 74 ?S REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h o 2 lAt 2:30 p.m. on 12-10-79 during normal operation of Unit 2, the Unit 2 l o 3 ["A" charging pump was taken out-of-service due to observed leakace in 1 0 4 l the discharge manifold area. The "C" pump was out-of-service for main-I o s jtenance at the time. The "C" pung was returned to operation at 4:08 p.ml o e ton 12-10-79. Minimal liquid leakage to radwaste system and no measurablu O 7 l noble gas release. "B" charging pump operable during period. No af fect i o si on public health or safety. Reportable per T.S. 15.6.9.2.B.2 and 1

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o IValve seat (Aiax cart no. P-5717-C-2; 316 SS) on the discharge check I Pose 4 M a c i i l valve of the Unit 2 "A" charcina cumo was leakina. ""co I i l valve seat failure is normal faticue. The valve seat was replaced. "A" l i , l charging pump is variable capacity, Aiax Iron Works Tvoe T-125, i A lreciprocatina piston, three evlinder model.

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ATTACHMENT TO LICENSEE EVENT REPORT NO. 79-008/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 2 Docket No. 50-301 At 2:00 p.m. on December 10, 1979, during normal operation of Unit 2, the Unit 2 "C" charging pump was taken out of service per a scheduled requirement for pump motor brush replacements. At 2:30 p.m. on the same date, the Unit 2 "A" charging pump was required to be taken out of service due to observed leakage in the discharge manifold area. This reduced the number of available charging pumps for this unit to one, the minimum number permitted by Technical Specifications.

Efforts were immediately taken to expedite maintenance and returning Unit 2 "C" charging pump to service and this was accomplished at 4:08 p.m. on December 10. Throughout the period, the Unit 2 "B" charging pump was operable.

There was minimal liquid leakage (three to five gallons) to the rad system drains and the waste processing system.

Operating experience indicates noble gas activity released from such leakages is not measurable.

The Unit 2 charging pumps are all variable capacity, Ajax Iron Works Type T-125, reciprocating piston, three cylinder models. Investigation indicated that the valve seat (Ajax part no. P-5717-C-2; 316 SS) on the discharge check valve of the Unit 2 "A" charging pump was leaking. Possible cause of valve seat failure is normal fatigue. The leaking valve seat was replaced.

Nc affect on public health and safety. Reportable per Technical Specifications 15.6.9.2.B.2 and 15.6.9.2.B.4.

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