ML110950290
| ML110950290 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 04/05/2011 |
| From: | Office of Nuclear Reactor Regulation |
| To: | Division of License Renewal |
| References | |
| Download: ML110950290 (7) | |
Text
DiabloCanyonNPEm Resource From: Ferrer, Nathaniel Sent: Tuesday, April 05, 2011 11:05 AM To: Grebel, Terence Cc: DiabloCanyonNPEm Resource
Subject:
Draft Telecon Summary Attachments: Telecon Summary 3-17-11.doc
- Terry, Attached is a draft of the Teleconference Summary for February 28 and March 17, 2011. Please review and let me know if there are any corrections/changes needed.
Please let me know if you have any questions.
Nathaniel Ferrer Project Manager Division of License Renewal Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission (301)4151045 1
Hearing Identifier: DiabloCanyon_LicenseRenewal_NonPublic Email Number: 2771 Mail Envelope Properties (26E42474DB238C408C94990815A02F094C09FA939C)
Subject:
Draft Telecon Summary Sent Date: 4/5/2011 11:05:06 AM Received Date: 4/5/2011 11:05:06 AM From: Ferrer, Nathaniel Created By: Nathaniel.Ferrer@nrc.gov Recipients:
"DiabloCanyonNPEm Resource" <DiabloCanyonNPEm.Resource@nrc.gov>
Tracking Status: None "Grebel, Terence" <TLG1@pge.com>
Tracking Status: None Post Office: HQCLSTR01.nrc.gov Files Size Date & Time MESSAGE 412 4/5/2011 11:05:06 AM Telecon Summary 3-17-11.doc 61946 Options Priority: Standard Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received:
LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Nuclear Power Plant, Units 1 and 2
SUBJECT:
SUMMARY
OF TELEPHONE CONFERENCE CALLS HELD ON FEBRUARY 28 AND MARCH 17, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING REQUESTS FOR ADDITIONAL INFORMATION RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897)
The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E or the applicant) held telephone conference calls on February 28 and March 17, 2011, to obtain clarification on the applicants response to requests for additional information (RAIs) regarding the Diablo Canyon Nuclear Power Plant license renewal application.
By letters dated January 7 and 12, 2011, PG&E responded to RAIs regarding the Flux Thimble Tube Program and Metal Fatigue. The subjects of these RAIs are open items concerning the Diablo Canyon Nuclear Power Plant safety evaluation report. The staff requested a telephone conference call for clarification regarding the applicants response. Enclosure 1 provides a listing of the participants. Enclosure 2 provides discussions on the RAIs for which the staff requested clarification. The applicant will submit applicable supplements within 30 days of the issuance of this summary.
The applicant had an opportunity to comment on this summary.
Nathaniel B. Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosures:
As stated cc w/encls: Listserv
LICENSEE: Pacific Gas and Electric Company FACILITY: Diablo Canyon Nuclear Power Plant, Units 1 and 2
SUBJECT:
SUMMARY
OF TELEPHONE CONFERENCE CALLS HELD ON FEBRUARY 28 AND MARCH 17, 2011, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND PACIFIC GAS AND ELECTRIC COMPANY CONCERNING REQUESTS FOR ADDITIONAL INFORMATION RELATED TO THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897)
The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of Pacific Gas and Electric Company (PG&E or the applicant) held telephone conference calls on February 28 and March 17, 2011, to obtain clarification on the applicants response to requests for additional information (RAIs) regarding the Diablo Canyon Nuclear Power Plant license renewal application.
By letters dated January 7 and 12, 2011, PG&E responded to RAIs regarding the Flux Thimble Tube Program and Metal Fatigue. The subjects of these RAIs are open items concerning the Diablo Canyon Nuclear Power Plant safety evaluation report. The staff requested a telephone conference call for clarification regarding the applicants response. Enclosure 1 provides a listing of the participants. Enclosure 2 provides discussions on the RAIs for which the staff requested clarification. The applicant will submit applicable supplements within 30 days of the issuance of this summary.
The applicant had an opportunity to comment on this summary.
Nathaniel B. Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosures:
As stated cc w/encls: Listserv DISTRIBUTION:
See next page ADAMS Accession Number:
OFFICE LA:DLR* PM: RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME DATE OFFICIAL RECORD COPY
TELEPHONE CONFERENCE CALL DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS FEBRUARY 28 AND MARCH 17, 2011 PARTICIPANTS: AFFILIATIONS:
Nate Ferrer U.S. Nuclear Regulatory Commission (NRC)
Allen Hiser NRC Jim Medoff NRC Yogen Garud Argonne National Laboratory (contractor)
Terry Grebel Pacific Gas and Electric Company (PG&E)
Mike Wright PG&E Kyle Duke PG&E Kevin Braico PG&E Dan Hardesty PG&E Michelle Albright PG&E Brett Lynch PG&E Brandy Sizemore PG&E Dave Kunsemiller Strategic Teaming And Resource Sharing (STARS)
Chalmer Myer STARS ENCLOSURE 1
DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION FLUX THIMBLE TUBE INSPECTION PROGRAM/TIME-LIMITED AGING ANALYSES RAI 4.1-7 In a response dated January 12, 2011, the applicant submitted the cumulative usage factor calculation for the baffle and former bolts as a time-limited aging analysis (TLAA). The applicant dispositioned the TLAA in accordance with 10 CFR 54.4(c)(1)(iii), stating that it would manage fatigue of the components with the Reactor Vessel Internals Aging Management Program.
Discussion:
The response was not clear on how the inspection frequency for the baffle and former bolts would be determined and justified. The applicant agreed to supplement its response to clarify how it would validate the inspection frequency for the components.
RAI 4.3-15 In a response dated January 7, 2011, the applicant committed to performing an evaluation to determine whether the NUREG/CR-6260-based components that have been evaluated for the effects of reactor coolant environment on fatigue usage are the limiting components. The applicant stated that if more limiting components are identified, then an evaluation will be performed in accordance with the Metal Fatigue of Reactor Coolant Pressure Boundary Program. In its response, the applicant also provided details discussing the assumed dissolved oxygen (DO) content for the derivation of environmentally-assisted fatigue factors. The applicant stated, in part, that for a pressurized-water reactor environment, the DO content is less than 0.05 ppm.
Discussion:
The response was unclear with regard to how nickel-alloy components would be evaluated, if they are determined to be one of the most limiting components. The staff noted that the applicants Metal Fatigue of Reactor Coolant Pressure Boundary Program does not address nickel-alloy components. Additionally, the response did not specify whether the DO content at Diablo Canyon Nuclear Power Plant is less than 0.05 ppm. The applicant agreed to supplement its response to RAI 4.3-15 to address the staffs concerns.
RAIs B2.1.21-2 In a supplemental response dated January 12, 2011, the applicant submitted justification for why the acceptance criteria for its Flux Thimble Tube Program are adequate. The applicant provided additional details on its operating experience related to flux thimble tubes, and clarified how it accounts for measurement uncertainties. Additionally, the applicant provided justification
for why the programs wear projection methodology was conservative and why the program was adequate. Additionally, during a conference call held on February 4, 2011, the applicant agreed to make flux thimble tube wear data available for the staff to audit.
Discussion:
The staff agreed that acceptance criteria are adequate and that they account for measurement uncertainties. However, the staff could not determine, based on the wear data, whether the programs wear projection was conservative. The applicant agreed to supplement its response to address the staffs concern with respect to programs the wear projection method