05000280/LER-1982-028

LER 82-028/03L-0:on 820513,both Charging Pump Svc Water pumps,2-SW-10A & 10B,lost Suction.Caused by Clogged Suction Line Strainer Due to Marine Growth & Increased Use of Svc Water by Chillers

ML20054G064
Person / Time
Site:	Surry
Issue date:	06/11/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20054G057	List: 05000280/LER-1982-028 05000280/LER-1982-060 ML20054G056
References
LER-82-028-03L-02, LER-82-28-3L-2, NUDOCS 8206210043
Download: ML20054G064 (3)

LER-2082-028,

Event date:
Report date:
2802082028R00 - NRC Website

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I c 13 110B, lost suction. This is contrarv tn T.S.3.3.A.R.b nnd is reportable in l 10!4 1!accordance with T.S.6.6.2.b(2). Since the pumps were out of service for only 5 I l e a s t l minutes and were restored to service within the time limit o f T . S. 3. 0.1. t he heal th !

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ATIACIDfENT 1 i' SURRY POWER STATION, UNIT NO. 2 DOCKET No: 50-281 82-028/03L-0 REPORT NO:

EVENT DATE: 05-13-82

) TITLE'0F THE EVENT: Loss of Suction to Service Water Pumps SW-P-10A and 10B l

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l. DESCRIPTION OF EVENT:

e With the unit at 96%, service water pump 2-SW-P-10A failed to maintain system pressure, causing the automatic start of the redundant pump, 2-SW-P-10B.

i llowever, pump 10B was air bound and did not return system pressure to normal l until the suction line uts manually flooded 5 minutes later. This event is contrary to T.S. 3.3.A.8.b and is reportable in accordance with T.S. 6.6.2.b.(2).

2.- PROBABLE CONSEQUENCES And STATUS of REDUNDANT EQUIPMENT:

f The charging pump service water pumps supply cooling water to the charging

pump intermediate seal oil coolers and the charging pump lubricating oil coolers. For the short period of time that these pumps were inoperable,

(5 minutes), the charging pump temperature did not increase. Since the pumps l were restored to service within the time limit of T.S.3.0.1, -the health and safety of the public were not affected.

3. CAUSE:

l Pump SW-P-10A could not maintain system pressure because of loss of suction l pressure that was caused by a clogged suction strainer.

The service water piping for the charging pump service water pumps also

supply the Control Room / Relay Room air conditioner chiller units 1-VS-E-4A, B,-

j and C. Use of service water by the chillers can cause a loss of suction pressure j to the charging pump service water pumps. In addition, an inspection revealed l marine growth fouling in the suction lines possibly decreasing NPSH at the pump.  :

A combination of these co~nditions caused the loss of suction to pump 1-SW-P-10B.

4. IMMEDIATE CORRECTIVE ACTION:

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The immediate corrective action was to throttle the service water flow through i

! the chillers and vent pump SW-P-10B so that the suction line to that pump j, was flooded. System pressure and flow then returned to normal.

5. SUBSEQUENT CORRECTIVE ACTION:

The suction strainer of pump SW-P-10A was cleaned, and the pump was returned

to service. .

6. ACTION TAKEN TO PREVENT RECURRENCE:

The marine growth fouling portions of the service water su,' ply lines has been:

i flushed from some of the piping (VEPCO procedure MMP-C-SW-120) . Preparations l are underway to flush the remaining portions of the suction piping. In addition, j a design change (D/C 81-41) has been initiated that will change and relocate the j service. water pumps and piping to increase the NPSH.  ;

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. . Page 2 Report No. 82-028/03L-0

7. GENERIC IMPLICATIONS:

This is a generic problem to both units at Surry.

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