ML20003A080
| ML20003A080 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 01/14/1981 |
| From: | Burwell S Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20003A081 | List: |
| References | |
| NUDOCS 8101290463 | |
| Download: ML20003A080 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION y
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I4 E Docket Nos. 50-445/446 APPLICANT: Texas Utilities Generating Company FACILITY:
Comanche Peak Steam Electric Station, Units 1 and 2 SUB.1ECT:
SUfEARY OF MEETING ON COMANCHE PEAK RESPONSE TO BORON DILUTION TRANSIENTS Summary A meeting was held at NRC Headquarters, 7920 Norfolk Avenue, Bethesda, Maryland on Wednesday, October 15, 1980. The purpose of the meeting was to permit Westinghouse to brief the NRC staff on a proposed design change being considered for Comanche Peak to improve the nuclear steam system response to boron dilution transients. Attendance at the meeting is listed on Enclosure 1.
Meeting Details Regulatory Guide 1.70, Revision 2 and the Standard Review Plan, NUREG-75/
087 require that the safety analysis report include an analysis for all operating modes of a malfunction of the chemical and volume control system which results in a decrease in the boron concentration in the reactor coolant of a pressurized water reactor. The Standard Review Plan provides guidance that from the time an alarm makes the operator aware of unplanr.ad moderator -
dilution, the following minimum time intervals must be available before a loss of shutdown margin occurs: 1) during refueling - 30 minutes; and
- 2) during all other operating modes - 15 minutes. The Comanche Peak FSAR does not contain acceptable results for hot standby, hot shutdown or cold shutdown.
In order to resolve this deficiency, the applicant and Westinghouse are propcsing a design modification for Comanche Peak. These design additions consist of a microprocessor to monitor source range neutron flux, an alarm, and a modification to the reactor protective system to provide automatic realignment of valves in the chemical volume control system to terminate dilution and initiate boration.
In short, the proposed solution will automatically terminate the cause of the transient and start the corrective response.
830
.03 I
o JAN 14 1981 The meeting presentation was made by Wes inghouse using 17 viewgraph slides. Westinghouse has since advised That certain of these slides contained infonnation it considers to be proprietary and requested with-holding from public disclosure.
(Westinghouse letter T. M. Anderson to R. L. Tedesco dated November 7, 1980). The enclosed viewgraph slides are the non-proprietary slides provided in the above letter. The proprietary slides may be inspected by members of the NRC staff in the Central Files, Accession Number: 8011170224.
The enclosed slides represent a reasonably complete record of the Westinghouse presentation. The NRC staff asked a number of questions, but was not negative to the proposed resolution. The applicant intends to submit an FSAR amendment in January 1981 documenting the proposed modifications to the Comanche Peak plant. Assuming a favorable and timely review by the NRC staff, the applicant expects to have the modifications in place by the Unit 1 fuel loading date.
5 /$ L os [
i S. B. Burwell, Project Manager Licensing Branch No. 2 Division of Licensing
Enclosures:
As stated cc w/ enclosures:
See next page
Mr. R. J. Gary Executive Vice President and JAN 14 1981 General Manager Texas Utilities Generating Company 2001 'ryan Tower-Dallas, Texas 75201 cc:
Nicholas S. Reynolds, Esq.
Mr. Richard L. Fouk.e Debevoise & Liberman Citizens for Fair Utility Regulation 1200 Seventeenth Street 1668-8 Carter Drive Washington, D. C.
20036 Arlington, Texas 76010 Spencer C..Relyea, Esq.
Resident Inspector / Comanche Peak Worsham, Forsythe & Sampels Nuclear Power Station 2001 Bryan Tower c/o U. S. Nuclear Regulatory Commission Dallas, Texas 15201 P. O. Box 3B Glen Rose, Texas 76043 Mr. Homer C. Schmidt Manager - Huclear Services Texas Utilities Services, Inc.
p 2001 Bryan Tower Dalia:, Texas 75201 Mr. H. R. Rock Gibbs and Hill, Inc.
393 Seventh Avenue New York, New York 10001 i
Mr. A. T. Parker-Westinghouse. Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania
- 15230 David J. Preister Assistant Attorney General Environmental Protection Division P. O. Box 12548, Capitol Station Austin, Texas 78711 Mrs. Juanita Ellis, President Citizens Association-for Sound l
Energy 1426 South Polk Dallas, Texas 75224 Geoffrey M. Gay,LEsq.
West Texas Legal Services 406 W. T. Waggoner Building 510 Houston Street-Fort. Worth, Texas
-76102 i
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ENCLOSURE 1 ATTENDANCE LIST FOR OCTOBER 15, 1980 PEETING COMANCHE PEAK STEAM ELECTPIC STATION, UNITS 1 AND 2 fRC STAFF TEXAS UTILITIES SERVICES, INC.
S. Burwell F. Madden it. Richings C. Feist M. Dunenfeld D. Fieno P. Bender J. Mauck T. Dunning R. Satterfield B. Morris T. Speis S. Diab F. Orr WESTINGHOUSE C. Tuley V. Koch L. Greenberg P. Torcaso E. Murphy D. Rawlins B. Steitler D. Call