05000338/LER-1979-008-01, /01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow

/01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow

ML19270F519
Person / Time
Site:	North Anna
Issue date:	02/12/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19270F517	List: 05000338/LER-1979-005, Forwards LER 79-005/01T-0 & 79-008/01T-0 05000338/LER-1979-005-01, /01T-0 on 790129:mufflers for Emergency Diesel Generators Not Seismically Supported Nor Missile Protected as Required by Fsar.Caused by Const Error 05000338/LER-1979-008-01, /01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow
References
LER-79-008-01T, LER-79-8-1T, NUDOCS 7902150374
Download: ML19270F519 (2)

LER-1979-008, /01T-0 on 790129:design Flow of 37 Gpm to Charging Pump Coolers Could Not Be Met.Caused by 2 Inch Carbon Steel Piping & Charging Pump Skid Piping Being Too Large to Allow Adequate Flow

Event date:
Report date:
3381979008R01 - NRC Website

text

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Virginia Electric and Power Cor.ipany North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-008/0lT-0

Description of Event

Recently, a special test was conducted on the Service Water System to determine the flow characteristics of the system during accident conditions.

The system was aligned to similate a LOCA on Unit #2 concurrent with a cool-down on Unit #1.

The test results indicate that with a 95 F service water system, one pump out for maintenance and failure of another to start, the design flow of 37 gpm to the charging /high head safety injection pumps could not be met.

Probable Consequences of Occurrence:

Presently, with only one unit operating and Service Water temperature between 60 and 70 F, adequate flow to the charging pump coolers is available during accident conditions.

Hence, there was no danger to the public or station personnel.

Cause

Preliminary investigation indicates the pressure drop across the 2 inch carbon steel piping, charging pump skid piping, and lube oil cooler temperature control valve is too large to allow adequate flow.

Immediate Corrective Action

No immediate action was taken.

Scheduled Corrective Action:

An engineering evaluation of this problem is continuing to determine what corrective action is required.

Actions Taken to Prevent Recurrence:

No further actior, required.