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

/01T-0 on 790129:mufflers for Emergency Diesel Generators Not Seismically Supported Nor Missile Protected as Required by Fsar.Caused by Const Error

ML19270F518
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-79-005-01T, LER-79-5-1T, NUDOCS 7902150372
Download: ML19270F518 (2)

LER-1979-005, /01T-0 on 790129:mufflers for Emergency Diesel Generators Not Seismically Supported Nor Missile Protected as Required by Fsar.Caused by Const Error

Event date:
Report date:
3381979005R01 - NRC Website

text

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8 t,0 01 DOCKET NUYBEH bd 69 EVENT DATE 74 lb HEPOHT DATE B3 EVENT DESCRIPTION AND PROBAULE CONSEQUENCES h lDuring Mode 3 operation, it was determined that the mufflers for the Emeroencv Diesel I o

2 Generators are not seismically supported nor missile protected as required by l

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[_section 3.2 of the FSAR.

Failure of the muffler could possibly restrict the flow I

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of exhaust from an operating diesel resulting in the diesel shutdown.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l Failure to saismically support or missile grotect the diesel exhaust mufflers durina 1

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._ 2, NAME OF PREPARER PHONE:

Virginia Electric and Power Company North Anna Power Station, Unit No. 1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. 79-005/0lT-0

Description of Event

On 1-29-79, while cooling down Unit 1 (Mode 3) during a forced outage, it was determined that the mufflers for the Unit 1 diesel generators ar' not seismically supported nor missile protected as required by section 3.2 of the FSAR.

Probable Consequence of Occurrence:

Two fully redundant diesel generators are assigned to Unit I to energiie the emergency hises in the event of a total loss of offsite power to permit functioning of structures, systems and components important to safety.

Failure of a muffler could, under proper circumstances, prevent diesel operation; however, the possibility that both units would be affected at the same time is remote.

The unit was in Mode 5 at the time the problem was discovered and remained in this mode until it was corrected. As a result, the health and safety of the general public was not endangered.

Cause

The failure to seismically support or missile protect the diesel generators exhaust mufflers during construction.

Immediate Corrective Action

The mufflers were removed from the exhaust manifold and a brace was added to hold the diesel exhaust piping.

Scheduled Corrective Action:

An engineering study to determine the final corrective action is currently being undertaken.

Action Taken to Prevent Recurrence:

No further action required.