ML16341D937
| ML16341D937 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/26/1986 |
| From: | Schierling H Office of Nuclear Reactor Regulation |
| To: | Shiffer J PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8611030455 | |
| Download: ML16341D937 (10) | |
Text
~J October 6, 1986 Docket No. 50-275 Mr. J.
D. Shiffer, Vice President Nuclear Power Generation c/o Nuclear Power Generation, Licensing Pacific Gas and Electric Company 77 Beale Street, Room 1451 San Francisco, California 94106 DISTRIBUTION NRC PDR Local PDR T. Novak OGC H. Schierling C.
Vogan E. Jordan J. Partlow E. Sullivan G. Johnson M. Mendonca P. Narbut PD83 Rdg.
N. Thompson ACRS(10)
B. Grimes J. Burdoin
Dear Mr. Shiffer:
SUBJECT:
DIABLO CANYON NUCLEAR POWER PLANT UNIT NO.
1 - ISI PROGRAM Your letters of April 14, 1986 (DCL 86-101) and August 12, 1986 (DCL 86-238) submitted Revisions 3 and 4, respectively, for the Diablo Canyon Unit 1 ISI Program.
Your letter of August 22, 1986 (DCL 86-251) provided information regarding the first refueling outage for Unit 1.
Based on our review of your submittals we have determined that additional information is required for us to complete our evaluation of your program for the first ten-year period.
The required information is identified in the enclosure.
We find that the information you provided with respect to the relief requests is adequate except for request NDE-008 as discussed in the enclosure.
We expect to complete our evaluation of these requests in conjunction with our overall evaluation of your program.
Sincerely,
Enclosure:
As stated cc:
See next page Hans S hierling, Senior Project Manager Project Directorate lII3 Division of PWR Licensing-A PD83 CVogan 10/~q /86 PDg3 HSchie ing:mak 10/A+86 3
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/86 sb11030455 Bb102b PDR ADOCY 05000275 PDR
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Mr. J.
D. Shiffer Pacific Gas and Electric Company Diablo Canyon CC:
Philip A. Crane, Jr.,
Esq.
Pacific Gas
& Electric Company Post Office Box 7442 San Francisco, California 94120 Mr. Malcolm H. Furbush Vice President
- General Counsel Pacific Gas 5 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 Mr. Frederick Eissler, President Scenic Shoreline Preservation Conference, Inc.
4623 More Mesa Drive Santa Barbara, California 93105 Ms. Elizabeth Apfelberg 1415 Cozadero San Luis Obispo, California 93401 Mr. Gordon A. Silver Ms. Sandra A. Silver 1760 Alisal Street San Luis Obispo, California 93401 Harry M. Willis, Esq.,
Seymour 5 Willis 601 California Street, Suite 2100 San. Francisco, Cali fornia 94108 Mr. Richard Hubbard MHB Technical Associates Suite K
1725 Hamilton Avenue San Jose, Cal ifornia 95125 Arthur C. Gehr, Esq.
Snell 5 Wi lmer 3100 Valley Center
- Phoenix, Arizona 85073 NRC Resident Inspector/Diablo Canyon Nuclear Power Plant c/o U.S; Nuclear Regulatory Commission P.
0.
Box 369 Avila Beach, California 93424 Ms.
Raye Fleming 1920 Mattie Road Shell Beach, California 93440 Joel
- Reynolds, Esq.
John R. Phillips, Esq.
Center for Law in the Public Interest 10951 West Pico Boulevard Third Floor Los Angeles, California 90064 j
Mr. Dick Blankenburg Editor 5 Co-Publisher South County Publishing Company P. 0.
Box 460 Arroyo Grande, California 93420 Bruce Norton, Esq.
Norton, Burke, Berry E French, P.C.
202 E.
Osborn Road P. 0.
Box 10569 Phoenix, Arizona 85064 Mr.
W.
C. Gangloff Westinghouse Electric Corporation P.
0.
Box 355 Pittsburgh, Pennsylvania 15230 David F. Fleischaker, Esq.
P.
0.
Box 1178 Oklahoma -City, Oklahoma 73101 Managing Editor San Luis Obispo County Telegram Tribune 1321 Johnson Avenue P. 0.
Box 112 San Luis Obispo, California 93406
Pacific Gas 5 Electric Company Diablo Canyon CC:
Dr.
R.
B. Ferguson Siera Club - Santa Lucia Chapter Rocky Canyon Star Route Creston, California 93432 Mr. Leland M. Gustafson, Manager Federal Relations Pacific Gas 5 Electric Company 1726 M Street, N.W.
Suite 1100 Washington, DC 20036-4502 J
Regi ona 1 Administrator, Regi on V
U.S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Michael J. Strumwasser, Esq.
Special Counsel to the Attorney General State of California 3580 Wilshire Boulevard, Suite 800 Los Angeles, California 90010 Mr. Tom Harris Sacramento Bee 21st and 0 Streets Sacramento, California 95814 Mr. H. Daniel Nix California Energy Commission 1516 9th Street, MS 18 Sacramento, California 95814 Lewis Shollenberger, Esq.
US Nuclear Regulatory Commission Region V
1450 Maria Lane Suite 210 Walnut Creek, California 94596 Mrs. Jacquelyn Wheeler 2455 Leona Street San Luis Obispo, California 93400 Mr. Thomas Devine Government Accountability Project Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 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 President California Public Utilities Commission California State Building 350 McAllister Street San Francisco, California 94102 Mr. Joseph
- 0. Ward, Chief Radiological Health Branch State Department of Health Services 714 P Street, Office Building b'8 Sacramento, California 95814 Ms. Nancy Culver 192 Luneta Street San Luis Obispo, California 93401 Ms. Laurie McDermott, Coordinator Consumers Organized for Defense of Environmental Safety 731 Pacific Street, Suite 42 San Luis Obispo, California 93401
REQUEST fOR ADDITIONAL INFORMAITON FIRST TEN-YEAR INTERVAL INSERVICE INSPECTION PROGRAM 1.
Relief Request NDE-008 Request for Relief NDE-008 is a generic relief request without a list of specific components for which relief is requested.
The regulations do not provide for granting generic relief requests.
Therefore, the staff requests the following information with regard to Request for Relief NDE-008:
(a) list the specific welds for which relief is requested, (b) for-each of the welds listed, a description of the obstructions or limitations encountered during the course of the examination(s),
and (c) an estimate of the percentage of the Code-required examination(s) that can be or was performed for each of the welds listed.
The Licensee shall obtain the above information for welds that are covered by Request for Relief NDE-008 for each of the refueling outages.
The above information shall be submitted for staff review within 60 days after completion of the first refueling outage inspections.
2.
Containment Spray System Paragraph 10 CFR 50.55a(b)(2)(iv) requires that ASME Code Class 2 piping welds in the Residual Heat Removal (RHR), Emergency Core Cooling (ECC), and Containment Heat Removal (CHR) systems shall be examined, These systems should not be completely exempted from inservice volumetric examination based on Section XI exclusion criteria contained in IWC-1220.
The Licensee has committed to inspecting one weld of the Containment Spray System during the second refueling outage of Diablo Canyon Unit I as part of the augmented examination of Class 2
CHR system welds.
The ISI Program Plan for the Containment Spray System should be revised to include a volumetric examination of a representative sample of welds.
The staff has required licensees for similar plants to perform volumetric examination of a minimum sample of 7.51.
The ISI Program Plan for the first 10-year interval is not acceptable without the addition of the augmented examination of Class 2
CHR system welds.
3.
UT Technique for Cast Stainles Steel With regard to limitations due to metallurgical properties of cast stainless steel (SA351 Grade CF8A), the staff has continued to monitor the development of new or improved examination techniques.
Significant improvements have been achieved in the ability to eXamine cast stainless steel and, accordingly, the staff is requiring that utilities attempt to
0 perform the Code-required examinations by incorporating these new techniques as part of the inservice examination procedures.
Proper calibration standards and equipment should be obtained for development of a qualified ultrasonic testing (UT) technique and procedure for Diablo Canyon Unit I'.
The Licensee should discuss the inservice examination procedures for the ultrasonic examination of the Diablo Canyon Primary Coolant System and, in particular, improved examination techniques and procedures incorporated to improve compliance with the Code.
The Licensee should also address this subject with regard to Request for Relief NDE-011.
4.
Additional Information for Requests for Relief The Licensee should provide an estimate of the percentage of the Code-required examination(s) that can be completed on the welds for which relief is requested in Requests for Relief NDE-001, NDE-004, and NDE-012.
Drawings showing limitations or obstructions may be provided to assist the staff in evaluation of the requests for Yelief.(e.g., ro] lout drawings of the Reactor Pressure Vessel).
5.
Relief Request NDE-002 Verification The Licensee should verify that the following statements are correct for Request for Relief NDE-002:
(a)
Bottom Head Circumferential Weld (¹4-443), Closure Head Circumferential Weld (¹6-446B),
and Bottom Head Meridional Welds
(¹1-443A through ¹1-443F) are totally inaccessible to the ASME Code-required examinations, and (b)
Closure Head Meridional Welds (¹I-446A through ¹1-446F) are each approximately 50Ã accessible to the Code-required examinations.
Owners of similar Westinghouse PWR plants have stated in relief requests that the Reactor Pressure Vessel bottom and closure head circumferential and meridional welds (similar to those in Request for Relief NDE-002) are accessible for 85K to 95% of the Code-required examinations.
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