05000254/LER-1981-011-03, /03L-0:on 810618,diesel Fire Pump B Out of Svc for More than 7 Days.Caused by Wood Debris Found in Suction Piping.New Strainers Ordered for Both Pumps

/03L-0:on 810618,diesel Fire Pump B Out of Svc for More than 7 Days.Caused by Wood Debris Found in Suction Piping.New Strainers Ordered for Both Pumps

ML20009B981
Person / Time
Site:	Quad Cities
Issue date:	07/01/1981
From:	Weinfurter E COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009B978	List: 05000254/LER-1981-011, Forwards LER 81-011/03L-0 05000254/LER-1981-011-03, /03L-0:on 810618,diesel Fire Pump B Out of Svc for More than 7 Days.Caused by Wood Debris Found in Suction Piping.New Strainers Ordered for Both Pumps
References
LER-81-011-03L-03, LER-81-11-3L-3, NUDOCS 8107200112
Download: ML20009B981 (2)

LER-1981-011, /03L-0:on 810618,diesel Fire Pump B Out of Svc for More than 7 Days.Caused by Wood Debris Found in Suction Piping.New Strainers Ordered for Both Pumps

Event date:
Report date:
2541981011R03 - NRC Website

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60 61 OOCKET NUMSER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lo l3l l On June 18, 1981, the "B" Diesel Fi re Pump was out of service for greater than 7 l

days. The consequences were minimal because protection was supplied by the "A"

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.>o CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i l 1 101 1 The Diesel Fire Pump was removed f rom service June 11, 1981. The pump was dis-l assembled and wood debris was removed from the suction piping. The portable pump '

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LER NUMBER:

LER/R0 81-ll/03L-0 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill.

FACILITY NAME:

Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

On June 10, 1981, the "B" Diesel Fi re Pump failed to pass the Monthly Fi re Pump Capacity Test, 405 4100-7 The fi re pump was taken out of service on June 11, inspected, and re-tested with the pump capaci ty remaining unchanged.

The pu,; was then removed from service for maintenance.

On June 18, 1981, with both Units running, the limitation of 7 days was reached, for having the "B" Diesel Fi re Pump out of service. Technical Speci fication 3.12.B.2 requi res a report to be submitted to the commission, explaining the back-up protection which replaces the systems' loss of redundancy.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

While the "B" Fire Pump is inoperative, fire protection water will be provided by the "A" Diesel Fire Pump and a 3160 GPM portable Diesel Fire Pump.

The portable fire pump is located at the discharge flume with all hardware to readily tie into the Fire Suppression System. Another portable fire pump is on site and can be placed in parallel with the first portable fire pump to provide additional pumping capacity should the need arise.

The portable fire pump was tested and proven operable prior to June 18, 1981. A temporary procedure was written for operation of the portable fire pumps. This system will be maintained until the "B" Fi re Pump is returned to service and tested.

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CAUSE

Upon disassembly of the "B" Diesel Fi re Pump, wood debris was found in the suction piping. The water source for the pump is the Mississippi R i ve r,

which contains some debris, which can be pulled into an operating pump.

These pumps normally have a bronze strainer which covers the suction.

When the pump was removed for service, no such strainer was found. This is the second occurrence of wood blocking the suction of a pump.,

On April 4,1981, a RHR Service Water Pump failed a flow test due to wood in the suction piping.

Vill.

CORRECTIVE ACTION

The pump was removed to the Maintenance Shop for repairs.

The pump was dis-assembled, the wood removed and the pump inspected for damage.

No damage to the pump was found. While the pump is disassembled, new rubber seals will be installed. To prevent similar problems in the future, new strainers have been ordered for both fire pumps, and will be installed at a convenient time.