05000254/LER-1980-028-03, /03L-0:on 801023,diesel Generator Cooling Water Pump Motor 1/2 Found two-thirds Submerged in Water.Caused by Inadequate Vault Sump Pump Sys.Vault Drained & Cooling Water Pump Motor Replaced

/03L-0:on 801023,diesel Generator Cooling Water Pump Motor 1/2 Found two-thirds Submerged in Water.Caused by Inadequate Vault Sump Pump Sys.Vault Drained & Cooling Water Pump Motor Replaced

ML19345B487
Person / Time
Site:	Quad Cities
Issue date:	11/18/1980
From:	Hannum D COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19345B479	List: 05000254/LER-1980-028, Forwards LER 80-028/03L-0 05000254/LER-1980-028-03, /03L-0:on 801023,diesel Generator Cooling Water Pump Motor 1/2 Found two-thirds Submerged in Water.Caused by Inadequate Vault Sump Pump Sys.Vault Drained & Cooling Water Pump Motor Replaced
References
LER-80-028-03L-03, LER-80-28-3L-3, NUDOCS 8012010382
Download: ML19345B487 (2)

LER-1980-028, /03L-0:on 801023,diesel Generator Cooling Water Pump Motor 1/2 Found two-thirds Submerged in Water.Caused by Inadequate Vault Sump Pump Sys.Vault Drained & Cooling Water Pump Motor Replaced

Event date:
Report date:
2541980028R03 - NRC Website

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. 61 OOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l~5T2 ] l The Un i t I equipment attendant inspected IC RHR Service Water vault and found the '/2 l gl Diesel Generator Cooling Water Pump motor to be about two-thirds submerged in watE -

l gog4gl The effects of this occurrence on the overall safety of the reactor were not adverse. l The Unit 2 Diesel Generator was demonstrated operable, and the Station had four off-l gl gl site lines available at all times.

Unit I was also shutdown for a refueling outage.

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33 34 3S 36 37 40 48 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l, l 0 l l The cause of this occurrence is that the existing vault sumo pump system is in-1 1 adequate. The RHR Service Water vault is completely sealed with no floor drains and I

i i i,121 i excessive packing leakage on the RHR Service Water pump Dacking flooded the floor.

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LER NUMBER:

LER/R0 80-28/03L-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 October 23,1980, at 9:45 p.m. the Unit One equipment attendant found the IC RHR Service Water vault to have excessive water on the floor. The 1/2 Diesel Cooling Water Pump was found to be about two-thirds submerged.

The 1/2 Diesel Cooling Water Pump was removed from service. Technical Specification 3 9.E.1. specifies necessary actions to be taken in the event the Diesel Generator becomes inoperable. On October 24, at 2135, surveillances for inoperable Diesel Generator were completed.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The effects of this occurrence on the overall safety of the reactor were not adverse. The Unit Two Diesel Generator was demonstrated operable and the Station had four off site lines available at all times. Unit One was also shutdown for a refueling outage.

Vll. CAUSE:

The existing sump in tne IC RHR Service Water vault is inadequate. There are no floor drains available in the vault. The room is totally sealed for flood protection per the Tech Specs.

Excessive packing leakage from the RHR Service Water Pumps flooded the floor and in turn partially sub-merged the 1/2 Diesel Generator Cooling Water Pump.

Vill. CORRECTIVE ACTION:

The 1/2 C:esel Generator Cooling Water Pump that was partially submerged was a temporary pump motor. Inis motor was replaced by the permanent Diesel Generator Cooling Water Pump motor. The IC RHR Service Water vault was drained. Currently, the Station is pursuing sump pump modifications l

for all RHR Service Water vaults.