ML19312E745
| ML19312E745 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 05/30/1980 |
| From: | Burwell S Office of Nuclear Reactor Regulation |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8006090484 | |
| Download: ML19312E745 (4) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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C W ASHINGToN, D. C. 20555 g
89.....,o Docket Nos. 50-445 yy 3 g ;gg and 50-446 APPLICANT:
TEXAS UTILITIES GENERATING COMPANY FACILITY:
COMANCHE PEAK STEAM ELECTRIC STATION, UNITS 1 AND 2
SUBJECT:
SUMMARY
OF APRIL 23, 1980 MEETING ON COMANCHE PEAK AUXILIARY FEE 0 WATER SYSTEM Summary A meeting was held at NRC Headquarters, 7735 Old Georgetown Road, Bethesda, Maryland, with Mr. Richard Werner representing the Texas Utilities Generating Company, on Wednesday afternoon, April 23, 1980.
The NRC was represented by members of the Probability Assessment Staff (PAS) of the NRC Office of Nuclear Regulatory Research and the Reliability and Risk Assessment Branch of the NRC Office of Nuclear Reactor Regulation.
Enclosurc 1 is the attendance list.
The purpose of the meeting was to discuss the reliability evaluation of the auxiliary feedwater system requested by the NRC generic letter dated March 10, 1980.
Mr. Werner sought clarification on the scope and format of presentation which would be responsive to the above request.
The bulk of the meeting was spent in describing the NRC staff's experiences and conclusions from perform-ing similar reliability evaluations.
Meeting Details The NRC staff described its reliability evaluation of auxiliary feedwater systems presented in NUREG-0611, " Generic Evaluation of Feedwater Transients and Small Break Loss-of-Coolant Accidents in Westinghouse Designed Operating Plants." We noted that the evaluation was a study in reliability, one plant relative to another, and included human interaction with the system.
Mr. Werner used a schematic of the Comanche Peak auxiliary feedwater system (AFWS) and several sheets depicting the fault tree for the AFWS for his discus-sion.
In view of the preliminary nature of these diagrams, they are not enclosed.
The discussion emphasized the inclusion of human factors in the fault tree analysis.
In our reliability evaluations for the feedwater transients, we found that the human failure predominates.
It is critical to look at how the human interacts with the system. We noted that Appendix II to WASH-1400,
" Reactor Safety Study," contains additional discussion on the inclusion of the human influence factor in the fault tree analysis.
Mr. Werner questioned whether he should use the reliability data base given in NUREG-0611.
We advised that TUGC0 should use the most appropriate data base.
If other data is more representative or applicable, it should be used.
In the absence of better data, we consider the NUREG-0611 data base acceptable.
2006090 I.
2 MAY 3 01980 However, we cautioned Mr. Werner about the difficulty of using this data to estimate absolute reliability numbers for the AFWS because of the wide spread of data points.
l The meeting ended with a discussion of the depth of detail to be included in the applicant's response to the letter of March 10, 1980.
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Sp'ottswood B. Burwell Licensing Branch No. 2 Division of Licensing Nuclear Reactor Regulation
Enclosures:
1.
Attendance List f
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Mr. R. J. Gary Executive Vice President and General Manager Texas Utilities Generating Company 2001 Bryan Towers Dallas, Texas 75201 cc: Nicholas S. Reynolds, Esq.
Mr. Richard L. Fouke Debevoise & Liberman Citizens for Fair Utility Regulation 1200 Seventeenth Street 1668-B 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 75201 P. O. Box 38 Glen Rose, Texas 70642 Mr. Homer C. Schmidt Manager - Nuclear Services Texas Utilities Services, Inc.
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 David J. Preister Assistant Attorney General Environmertal 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. Gay, Esq.
West Texas Legal Services 406 W. T. Waggoner Building 810 Houston Street Fort Worth, Texas 76102 j
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MAY 3 01980 ENCLOSURE 1 COMANCHE PEAK STEAM ELECTRIC STATION, UNITS 1 AND 2 MEETING ATTENDANCE LIST Wednesday April 23, 1980 Texas Utilities Richard Werner Texas Utilities Services R. E. Ballard Gibbs & Hill NRC Staff S. B. Burwell NRR, DL, LB #2 M. A. Taylor RES, PAS J. J. Curry RES, PAS P. D. O'Reilly NRR, DST, RRAB A. A. Lakner NRR, DST, RRAB J. S. Wermiel NRR, DSI, ASB 1
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