ML20046C317
| ML20046C317 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/19/1993 |
| From: | Hernan R Office of Nuclear Reactor Regulation |
| To: | Broughton T GENERAL PUBLIC UTILITIES CORP. |
| References | |
| GL-92-01, GL-92-1, TAC-M83741, NUDOCS 9308100134 | |
| Download: ML20046C317 (4) | |
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W ASHINGTON, D.C. 2055>.0001 July 19,1993 Docket No. 50-289 Mr. T. Gary Broughton, Vice President and Director - THI-1 GPU Nuclear Corporation Past Office Box 480 Middletown, Pennsylvania 17057
Dear Mr. Broughton:
SUBJECT:
THREE MILE ISLAND UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION REGARDING GENERIC LETTER 92-01, REVISION 1 (TAC NO. M83741)
On July 2,1992, GPU Nuclear Corporation (GPUN) submitted its response to Generic Letter (GL) No. 92-01, Supplement 1.
The purpose of the generic letter is to obtain information needed to confirm compliance with the requirements set forth in Appendices G and H to 10 CFR Part 50~regarding reactor vessel structural integrity. To continue its assessment, the NRC staff needs the following additional information.
GL 92-01 Ouestion 2a:
The response to GL 92-01 indicates that the initial upper-shelf energy (USE) for all beltline welds are not known. An owners group report on USE equivalent margin analysis regarding beltline welds with low USE values for Levels A & B is under preparation by Babcock-Wilcox Owners Group (B&WOG); a similar B&WOG report for Levels C & D is under NRC review now.
The licensee must confirm that these two topical reports will be used as its licensing bases to demonstrate that all beltline welds will meet the USE requirements of Appendix G, 10 CFR 50.
The response indicates that the limiting initial USE is 91 ft-lb, a generic value for SA 5338 plates (BAW-10046, Rev 3).
Either provide the Charpy USE for each beltline plate or provide the Charpy USE and analysis from plates that were fabricated using the same ver. dor, fabrication time frame, fabrication process, and material specification to demonstrate that all beltline welds will meet the USE requirements of Appendix G, 10 CFR 50.
If this cannot be provided, then submit an analysis which demonstrates that lower values of USE will provide margins of safety against fracture equivalent to those required by Appendix G of the ASME Code.
GL 92-01 Ouestion 2b:
The response indicates that a generic initial RT, of -5 *F, which is the mean RT, value for 34 Linde 80 welds (BAW-1803, Revision 1), has been used for all welds except the Weld WF-70.
Provide justifications for not using the generic mean value of 0 ?F suggested by 10 CFR 50.61.
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July 19, 1993-Should you need clarification regarding this request, please contact me at (301) 504-2010.
Sincerely, I
Original signed by:
Ronald W. Hernan, Senior Project Manager Project Directorate I-4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation cc: See next page Distribution:
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Mr. T. Gary Broughton July 19,1993 Should you need clarification regarding this request, please contact me at (301) 504-2010.
Sincerely, t
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e Ronald W. Hernan, Senior Project Manager Project Directorate I-4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation.
cc:
See next page i
Mr. T. Gary Broughton Three Mile Island Nuclear Station, GPU Huclear Corporati,on Unit No. I cc:
Michael Ross Michele G. Evans O&M Director, THI-1 Senior Resident Inspector (TMI-1)
GPU Nuclear Corporation U.S. Nuclear Regulatcry Commission Post Office Box 480 Post Office Box 311 Middletown, Pennsylvania 17057 Middletown, Pennsylvania 17057 Michael Laggart Regional Administrator, Region I Manager, Licensing U.S. Nuclear Regulatory Commission GPU Nuclear Corporation 475 Allendale Road 100 Interpace Parkway King of Prussia, Pennsylvania 19406 Parsippany, New Jersey 07054 Robert B. Borsum Robert E. Rogan B&W Nuclear Technologies TMI Licensing Director Suite 525 GPU Nuclear Corporation 1700 Rockville Pike Post Office Box 480 Rockville, M9ryland 20852 Middletown, Pennsylvania 17057 Ernest L. Blake, Jr., Esquire William Dornsife, Acting Director Shaw, Pittman, Potts & Trowbridge Bureau of Radiation Protection 2300 N Street, NW.
Pennsylvania Department of Washington, DC 20037 Environmental Resources Post Office Box 2063 Chairman Harrisburg, Pennsylvania 17120 Board of County C".imissioners of Dauphin County County Courthouse-Harrisburg, Pennsylvania 17120 Chairman Board of Supervisors of Londonderry Township R.D. #1, Geyers Church Road Middletown, Pennsylvania 17057