ML16341E405
| ML16341E405 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/30/1987 |
| From: | Murley T Office of Nuclear Reactor Regulation |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| References | |
| TAC-66383, NUDOCS 8711030403 | |
| Download: ML16341E405 (10) | |
Text
October 30, 1987 0
Docket No.:
50-275 and 50-323 You indicate that the first surveillance capsule was withdrawn from the reactor vessel of Diablo Canyon Unit I on October 10,
- 1986, and shipped to Mestinghouse Electric Corporation for analysis in early January 1987.
Due to problems with r emote handling equipment and Charpy specimens, you have requested a four-month extension of the submittal date for the summary technical report (until January 31, 1988).
The purpose of the reactor vessel material surveillance program is to monitor the effects of neutron irradiation damage and the thermal environment on the reactor vessel beltline material integrity.
The analysis of the surveillance capsules serves to determine the safety margin of the beltline material associated with the pressure-temperature limits as'equired by Appendix G of 10 CFR Part 50.
As shown in License Amendment Request (LAR) 85-11 dated October 24, 1985, the reactor coolant system pressure-temperature limits apply to both units and are applicable for the first five effective full-power years (EFPY) of operation.
The NRC staff has reviewed this aspect of LAR 85-11 and agrees that the limits are appropriate as proposed.
You indicate in your extension request of September 28, 1987, that the expected exposure for the Unit I reactor vessel at the end of'ecember 1987 is 2.1 EFPY.
Since Unit 1 has DISTRIBUTION OOOFi,~
NRC 8
LPDRs CTrammell GHolahan JLee OGC-Bethesda PDV Plant File
'Jordan JPartlow ACRS (10)
Dear Mr. Shiffer:
BElliot CYCheng
SUBJECT:
10 CFR 50 APPENDIX H -.EXTENSION OF DATE FOR SURVEILLANCE CAPSULE
SUMMARY
REPORT (TAC NO. 66383)
By letter dated September 28, 1987, you requested that we extend the submittal date for the summary technical report for the first reactor vessel surveillance capsule for Diablo Canyon Nuclear Power Plant, Unit NO. l.
As provided in 10 CFR 50, Appendi,x H,Section III.A, licensees must submit such summary technical reports within one. year after capsule withdraw'al, unless an extension is granted.
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Wa OCT 30 )gy operated longer than Unit 2, Unit 1 has the greater exposure.
The expected exposure as of January 31, 1988 (the proposed report submittal date) for Unit 1 would therefore be 2.2 EFPY or less.
This exposure is well below the allowable limit of 5 EFPY discussed above and the summary report of the capsule would still be submitted well in advance of reaching the limit.
Hence, there is an adequate margin (2.8 EFPY) between the actual amount of neutron irradiation exposure and the, exposure on which the heatup and cooldown curves are based.
As a result of this margin,.a delay of about four months in the submittal of the summary report is not safety-significant.
On this basis, we conclude that the requested extension is acceptable.
Accordingly, the date for submittal of the summary technical report is extended until not later than January 31,
- 1988, as requested.
Sincerely, Orig1nal signed by Thomas Z. Murley Thomas E. Murley, Director Office of Nuclear Reactor Regulation CC:
See next page
- See previous concurrence
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operate longer than Unit 2, Unit 1 has the greater exposure.
The expected exposure of January 31, 1988 (the proposed report submittal date) for Unit 1
would ther fore be 2.2 EFPY or less This exposure is well below the allowable limit of 5 SPY discussed above and the summary report of the capsule would still be subm'itted well in advance of reaching the limit.
- Hence, there is an adequate margin (2.8 EFPY) between the actual amount of neutron irradiation exposure and the exposure on which the heatup and cooldown curves are based.
As a result of this margin, a delay of about four months in the submittal of the summary report 3q not safety-significant.
On this basis, we conclude that the requested extension is acceptable.
Accordingly, the date for submittal of the summary technical rapport is extended until not later than January 31,
- 1988, as requested.
Sincerely, homas E. Nurley, Director Office of Nuclear Reactor Regulation CC:
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Mr. J.
D. Shiffer Pacific Gas and Electric Company Diablo Canyon CC:
Richard F. Locke, Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Janice E. Kerr, Esq.
California Public Utilities Commission 350 McAllister Street San Francisco, California 94102 Ms. Sandra A. Silver 660 Granite Creek Road Santa Cruz, California 95065 Mr. W. C. Gangloff Westinghouse Electric Corporation P. 0.
Box 355 Pittsburgh, Pennsylvania 15230 Managing Editor San Luis Obispo County Telegram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406 Mr. Leland M. Gustafson, Manager Federal Relations Pacific Gas and Electric Company 1726 M Street, N.
W.
Washington, DC 20036-4502 Dian M. Grueneich Marcia Preston Law Office of Dian M. Grueneich 380 Hayes Street, Suite 4
San Francisco, California 94102 NRC Resident Inspector Diablo Canyon Nuclear Power Plant c/o U.S. Nuclear Regulatory Commission P. 0.
Box 369 Avila Beach, California 93424 Mr. Dick Blakenburg Editor & Co-Publisher South County Publishing Company P,. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
c/o Richard F. Locke, Esq.
Pacific Gas and Electric Company Post Office Box 7442 San Francisco, California 94120 Jl Dr. R. B. Ferguson Sierra Club - Santa Lucia Chapter Rocky Canyon Star Route Creston, California 93432 Chairman San Luis Obispo County Board of Supervisors Room 220 County Courthouse Annex San Luis Obispo, California 93401 Director Energy Facilities Siting Division Energy Resources Conservation and Development Commission 1516 9th Street Sacramento, California 95814 Ms. Jacquelyn Wheeler 3033 Barranca Court San Luis Obispo, California 93401
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Pacific Gas 5 Electric Company,
Diablo Canyon CC:
Ms. Laurie McDermott, Coordinator Consumers Organized for Defense',,
of Environmental Safety 731 Pacific Street, Suite 42 San Luis Obispo, California 93401 Mr. Joseph
- 0. Ward, Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building $8 Sacramento, Cali fornia 95814 Regional Administrator, Region V
U.S. Nuclear Regulatory Corrimission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Ms, Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 President California Public Utilities Commission California State Building 350 McAllister Street San Francisco, California 94102 Michael M. Strumwasser, Esq.
Special Assistant Attorney General State of California Department of Justice 3580 Wilshire Boulevard, Room 800 Los Angeles, California 90010
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