ML17250A828

Suppls 801031 Submittal Re Environ Qualification of Electrical Equipments. Possible Effects of Motor Driven Auxiliary Feedwater Pumps Failure Due to High Energy Line Break on Class IE Sys Provided

ML17250A828
Person / Time
Site:	Ginna
Issue date:	12/15/1980
From:	Maier J ROCHESTER GAS & ELECTRIC CORP.
To:	Crutchfield D Office of Nuclear Reactor Regulation
References
TASK-03-12, TASK-3-12, TASK-RR NUDOCS 8012220341
Download: ML17250A828 (6)

Text

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ACCESSION ABR:80122203<ii DOC ~ DATE: 80/12/15 NOTARIZED:

NO DOCKET FACIL:50"244 Robert Emmet Ginna Nuclear Plantr Unit li Rochester G

05000200 AUTH.NAME AUTHOR AFFILIATION MAIERgJ ~ E>

Rochester Gas 8 Electric Corp.

RECIP ~ NAME RECIPIENT AFFILIATION CRUTCHF IELDg D ~

Operating Reactor s Branch 5

SUBJECT:

Suppls 801031 submittal re "Environ Qualification of Electrical Equipments ~" Possible effects of motor driven auxiliary feedwater pumps failure due to high energy line break on Class 1E sys provided.

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December 15, ELECTRIC CORPORATION S9 EAST AVENUE, ROCHESTER, N.Y. 14649 I"

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Director of Nuclear Reactor Regulation Attention:

Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch N5 U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

SEP Topic III-12, Environmental Qualification of Electrical Equipment R.

E. Ginna Nuclear Power Plant Docket No. 50-244

Dear Mr. Crutchfield:

Rochester Gas and Electric has reviewed the possible effects of a failure of the motor-driven auxiliary feedwater

pumps, due to the postulated occurrence of a high energy line break in the Intermediate Building, on the Class 1E electrical

systems, as discussed below.

This information supplements information provided in paragraph IV-11 of RG6E 's October 31, 1980 submittal concerning "Environmental Qualification of Electrical Equipment".

The power feeder cables for the motor driven auxiliary feedwater pumps are routed from motor control centers (MCC's) 14 and 16, located on separate floors of the Auxiliary Building, to these pumps.

The current flow in each feeder circuit is controlled by a DB-50 circuit breaker, located at the MCC's, with overcurrent settings matched to the pump characteristics and the bolted fault magnitude for the feeder circuit.

Any faults generated by a pump failure will be cleared by these breakers.

A single failure of a breaker will affect only one of the two safety-related "trains".

Since the breakers and MCC's are located in the Auxiliary Building, and would therefore not be subject to the harsh high energy line break environment, they are not subject to a common mode failure.

Control circuits for the -pumps are routed from the Control Room and Relay Room to the Auxiliary Building.

These circuits also have overcurrent protection, and are not exposed to the high energy line break environment.

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ROCHESTER GAS AND ELECTRIC CORP.

December 15, 19 80 Mr. Dennis M. Crutchfield, Chief SHEET NO.

It is therefore concluded that the Class IE electrical systems will not be degraded by a high energy line break in the Intermediate Building.

Very truly yours, J.

E. Maier JEM:ng cc:

John Archer, FRC

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