05000280/LER-1978-044-03, /03L-0 on 781204:during Normal Full Pwr Oper,Loss of Flow Was Detected in Charging Pump Intermediate Seal Cooler 1-SW-E-1B.Caused by Failure of Cooler Intake Gate Valve Becoming Corroded

/03L-0 on 781204:during Normal Full Pwr Oper,Loss of Flow Was Detected in Charging Pump Intermediate Seal Cooler 1-SW-E-1B.Caused by Failure of Cooler Intake Gate Valve Becoming Corroded

ML18113A730
Person / Time
Site:	Surry
Issue date:	12/18/1978
From:	Baucom T VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18113A729	List: 05000280/LER-1978-044, Forwards LER 78-044/03L-0 05000280/LER-1978-044-03, /03L-0 on 781204:during Normal Full Pwr Oper,Loss of Flow Was Detected in Charging Pump Intermediate Seal Cooler 1-SW-E-1B.Caused by Failure of Cooler Intake Gate Valve Becoming Corroded
References
LER-78-044-03L, LER-78-44-3L, NUDOCS 7812270324
Download: ML18113A730 (2)

LER-1978-044, /03L-0 on 781204:during Normal Full Pwr Oper,Loss of Flow Was Detected in Charging Pump Intermediate Seal Cooler 1-SW-E-1B.Caused by Failure of Cooler Intake Gate Valve Becoming Corroded

Event date:
Report date:
2801978044R03 - NRC Website

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE

, BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

L..2..li] I During normal full power operation, a loss of flow was detected in the charging pump i~termediate seal ccioler l-SW-E-18.

R~dundant cooler 1-SW-E-lA was placed in service until valve repairs were completed.

Unit l operated in a degraded mode in accordance with T.S. 3.3.s.7 and the event* is reportable per T~S. 6.6.2.b.(2)t [IT[]

• .((ill The health and safety of the public were not affected because the standby cooler

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Loss of flow resulted from failure of the cooler intake gate valve *.

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Do~ket No: 50-280 Report No: 78-044/0JL-O Event Date: 12-4-78 Title of Report:

Loss of Service Water Flow Through Charging Pump Intermediate Seal Cooler

1.

Description of Event

At about 1440 on Dece~ber 4, 1978 with Unit 1 operating at fuJl po~er, a loss of flow was detected in the charging pump intermediate seal cooler 1-SW-E-1B.

Unit 1 was operating in a degraded mode in accordance with Technical Specificat*ion 3.3.B.7 and the event is reportable in accordance with T~chnical Speci_fication 6.6.2.b.(2).

2.

Probable Consequences of Event:

Loss of the charging pump intermediate seal cooler 1-SW-E-1B did not affect the health and safety of the general public because adequate cooling was obtained from the 11A11 charging pump intermediate seal cooler which is a redundant, fu 11 size coo 1 er.

3.

Cause

Loss of flow to the 11811 intermediate seal cooler resulted from failure of the cooler intake gate valve 1-SW-110.

Corrosion of the valve stem permitted the disk to fall freely and obstruct service water flow.

4.

Immediate Corrective Action

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Immediate action was taken to establish and verify flow to seal cooler 1-SW-E-lA.

5.

Subsequent Corrective Ac~ion:

The inoperable gate valve was repaired by installing a new stem fabri-cated from stainless steel~

6.

Action to Prevent Recurrence:

A corrosion study was performed on the service water gate valves result-ing in initiation of a design change for replacement with bronze ball valves.

Bal 1 valves wi 11 eliminate the galvanic_ couple created by stem to disk contact in salt water.

7.

Generic lmpl ications:

Valve failure in the charging pump service water subsjstem is gene~ic in that many of the existing gate valves are undergoing the same galvanic corrosion.

Replacement with bronze ball valves will solve this corrosion problem and provide for long term reliability.