ML19320C505

First Interim Deficiency Rept PRD-80/32 Re Standby Svc Water Sys Design Deficiency.Debris Picked Up by Standby Svc Water & HPCS Svc Water Pumps Transferred Into Sys.No Provision Exists for Filtering.Sys Design Will Be Analyzed

ML19320C505
Person / Time
Site:	Grand Gulf
Issue date:	07/11/1980
From:	MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML19320C502	List: ML19320C501 ML19320C505
References
AECM-80-153, NUDOCS 8007170294
Download: ML19320C505 (1)

Text

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1. Attachm:nt A to AECM-80/153 Page 1 of 1 ,

INTERIM REPORT ON PRD-80/32 I. Description of Deficiency The Standby Service Water (SSW) basins have accumulated debris which was blown into the basins from the surrounding area. During a flush of the system, it was noted that the debris was being picked up by the SSW and HPCS service water pumps and transferred it.to the system. There is no provision for filtering the debris.

II. Safety Implications The SSW pumps and the HPCS service water pumps take suction from the SSW basins and provide safety related cooling water to plant auxiliaries which require cooling water during an emergency shut-down of the plant. These auxiliaries include the HPCS Diesel Generator Cooler, the Standby Diesel Generator Cooler and the SSW pump motor bearing oil coolers. Should debris enter the sys-tem and clog the flow path of the cooling water, the cooler could be rendered inoperable thus leading to oil overheating and, ulti-mately, to bearing and pump failure.

III. JCbtrective Action Corrective act'an is contingent on an analysis of the system design and subsequen- .ssuance and implementation of design changes.

This deficiency is being tracked by Bechtel MCAR No. 85.

8007170294