ML19208A883

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Discusses Analysis Performed to Establish Equipment Qualification Envelope for Engineered Safety Features of Equipment Inside Containment.Forwards Temp Vs Time & Pressure Vs Time Profiles for Worst Case Conditions
ML19208A883
Person / Time
Site: Comanche Peak  Luminant icon.png
Issue date: 08/22/1979
From: Baer R
Office of Nuclear Reactor Regulation
To: Gary R
TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
NUDOCS 7909180149
Download: ML19208A883 (6)
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'o UNITED STATES 8Ig#f(

NUCLEAR REGULATORY COMMISSION a

WASHINGTON, D. C. 20555 AUG 2 21979 Docket Nos. 50-445 and 50-446 Mr. R. J. Gary Executive Vice President and General Manager Texas Utilities Generating Company 2001 Eryan Towers Dallas, Texas 7520T

Dear Mr. Gary:

SUBJECT:

ENVIRONMENTAL QUALIFICATION ENVELOPE FOR ENGINEERED SAFETY FEATURE EOUIPMENT INSIDE CONTAINMENT - COMANCHE PEAK STEAM ELECTRIC STATICN The NRC staff has performed an independent analysis to establish the equipment qualification envelope which will serve as a basis for staff acceptance of all qualification testing of engineered safety feature equipment located inside containment for the Comanche Peak Steam Electric Station. contains temperature versus time profiles which depict the worst temperature conditicas from main steam line break analyses performed by the NRC staff and the CPSES staff. This Enclosure also depicts the worst case temperatures for the loss-of-coolant accident as determined by the NRC staff and the CPSES staff. provides the pressure versus time curves for the MSLB and LOCA.

The pressure curves should be used in conjunction with Enclosure 1.

As can be seen on the graphs, we find that excellent agreement exists between the work perforr. ' by the respective staffs.

The CPSES FSAR should provide documentation to support its equipment qualifi-cation procedures; the procedures must satisfy the requirements of Enclosures 1 and 2.

The proper interpretation of these curves is as follows:

1.

The qualification program must include both the MSLB and LOCA pressure /

temperature profiles.

The test profiles may envelope both events in a single qualification test.

Alternately, these may be considered separate events.

That is, equipment qualified to separate qualification tests, one for the MSLB pressure / temperature profiles and another for the LOCA ressure/ temperature profile, will be acceptable.

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Mr. R. J. Gary AUG 2 21979 2.

Your qualification program must test to a temperature envelope which at any given time is equal to or greater than any specific temperature which has been calculated by either the NRC staff or the CPSES staff.

3.

For the entire duration of the test, the pressure must be equal to or greater, at any given time, than any specific pressure which has been cal-culated by either the NRC staff or CPSES staff; and 4.

For the time period of 1000 to 3600 seconds, your qualification program should test to a temperature which exceeds the linear extrapolation of the temperature versus time curve.

Pressure during this period of time should also be extrapolated from the enclosed curves.

The enclosed curves are applicable for the accident related pressure / temperature stresses on engineered safety feature equipment located within the containment.

Other accident related stresses (e.g., humidity, radiation, etc.) must also be considered in the total environmental qualification programs for this equipment.

We expect to issue NUREG-0588, " Interim Position on Equipment Qualification of Safety Related Eauipment," during September.

This document will describe the total requirements for an environmental qualification program which will be acceptable to the NRC staff.

A co?y of this report will be sent to you when it becomes available.

Please contact us if you have questions, or desire a discussion or clarification on the utilization of the enclosed qualification envelope curves.

Sincerely,

{k0SLL Robert L. Baer, Chief Light Water Reactors Branch No. 2 Division of Project Management

Enclosures:

As Stated ces w/ enclosures:

See next pages

% 8.1. D

Mr. R. J. Gary Mr. R. J. G a ry Executive Vice President and General Manager Texas Utilities Generating Company 2001 Bryan Towers Dallas, Texas 75201 Nicholas S. Reynolds, Esq.,

Debevoise & Liberman 1200 Seventeenth Street Washington, D.C.

20036 Spencer C. Relyea, Esq.

Worsham, Forsythe & Sampels 2001 Bryan Tower Dallas, Texas 75201 Mr. Homer C. Schmidt Project Manager - Nuclear Plants Texas Utilities Generating Company 2001 Bryan Tower Dallas, Texas 75201 Mr. H. R. Rock Gibbs and Hill, Inc.

393 Seventh Avenue New York, New York 10001 Mr. A. T. Parker Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 Richard W. Lowerre, Esq.

Assistant Attorney General Environmenta1 Protection Division P. O. Box 12548, Capitol Station Austin, Texas 78711 Mrs. Juanita Ellis, President Citizens Association for Sound Energy 1426 South Polk Dallas, Texas 75224 Geoffrey M. Say, Esq.

West Texas '_egal Services 406 W.T. Waggoner Building 310 Houston Street Fort Worth, Texas 76102 3;M;1d6

Mr. R. J. Gary Ms. Nancy Holdam Jacobson Citizens for Fair Utility Regulation 1400 Hemphill Fort Worth, Texas 76104 Mr. Richard Fouke 1668-B Carter Drive Arlington, Texas 76010 O%w

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