ML17244A225

Requests Addl Info from SEP Licensees Re Elec Penetrations of Reactor Containments in Order to Complete Eval

ML17244A225
Person / Time
Site:	Ginna
Issue date:	12/08/1978
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	White L ROCHESTER GAS & ELECTRIC CORP.
References
TASK-08-04, TASK-8-4, TASK-RR NUDOCS 7812150101
Download: ML17244A225 (6)

Text

OEg 0 8 1978 Docket No. 50-244 t~r. Leon D. Hhite, Jr.

Vice President Electric and Steam Production Rochester Ga's 5 Electric Corporation 89 East Avenue Rochester, New York 14649

Dear Hr. Nhite:

Me have completed our search of the dockets for the SEP Plants for information relative to Topic VIII-4, "Electrical Penetrations of Reactor Containments."

The results of this effort has revealed the need for additional information to complete our evaluation of this topic.

Please provide the information identified in the enclosure within ninety (90) days.

Sincerely, Original Signel by:

Dennis L. Ziemann

Enclosure:

Request for Additional

~ Information CC:

See next page VSZN.se5 i Dennis L. Ziemann, Chief Operating Reactors Branch P2 Division of Operating Reactors ocket 50-244)

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20036 Hr. Michael Slade 1250 Crown Point Drive

Webster, New York 14580 Rochester Committee for Scientific Information Robert E. Lee, Ph.D.

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Box 5236 River Campu s Station Rochester, New York 14627 Jeffrey Cohen Hew York State Energy Office Swan Street Building Core 1, Second Floor Empire State Plaza

Albany, Hew York 12223 Director, Technical Development Programs

,State of New Yor k Energy Office Agency Building 2 Empire State Plaza

Albany, New York 12223 Rochester Public Library 115 South Avenue Rochester, Hew York 14627

ENCLOSURE RE UEST FOR INFORMATION FROM SEP LICENSEES To ic VIII Electrical Penetrations of Reactor Containment Me have performed a review of the information contained in your docket concerning electrical penetrations of reactor containment.

The objective of this SEP topic is to determine the capability of penetrations to maintain containment integrity during short-circuit current conditions and the worst expected transient fault current resulting from single random failures of circuit overload protection devices.

Based on information contained on your docket concerning electrical penetrations we have determined that additional information is necessary to confirm that this objective is satisfied.

In this regard, we request that you provide the following information for a typical low-voltage penetration circuit (150-1000 Vac);

a typical medium voltage penetration circuit (greater than 1000 Vac); and a typical direct current power penetration circiut (if any).

A.

Circuit Information l.

Identify each typical circuit which has been selected.

2.

Provide the trip curves (current versus time) for the primary and the secondary protection devices.

3.

State the maximum short circuit current available to the selected penetration circuit (the short-circuit current for AC circuits should be expressed in rms symmetrical amperes with the symmetrical current being initially offset by a DC component.

The short circuit current for direct current circuits should be based on the current having a constant DC value).

4.

State the size of the conductor(s) for the selected circuit (that is, conductor size external to the electrical penetration).

r B.

Electric Penetration Information 2.

State the manufacturer's electrical penetration identification number and provide the size of the conductor(s) in the penetration.

Also provide the rated continuous current for each conductor.

State the rated short-circuit overload current and the duration of this current.

3.

Provide a description of all electrical tests for these penetrations and state the results of these tests.

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References:

1.

Regulatory Guide 1.63, Revision 2, "Electrical Penetrations in Containment Structures for Water Cooled Nuclear Water Plants."

2.

IEEE Standard 317-1976 - "IEEE Standard for Electrical Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations."