DCL-11-036, Update Regarding the Intake Structure and Discharge Conduits Inspections
| ML110940277 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 03/25/2011 |
| From: | Becker A Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| DCL-11-036 | |
| Download: ML110940277 (4) | |
Text
Pacific Gas and Electric Company' James R. Becker Diablo Canyon Power Plant Site Vice President Mail Code 104/5/601 P. O Box 56 Avila Beach, CA 93424 805.545.3462 March 25, 2011 Internal: 691.3462 Fax: 805.545.6445 PG&E Letter DCL-1 1-036 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units 1 and 2 Update Regarding the Intake Structure and Discharge Conduits Inspections
Dear Commissioners and Staff:
By Pacific Gas and Electric Company (PG&E) Letter DCL-09-079, "License Renewal Application," dated November 23, 2009, PG&E submitted an application to the U.S.
Nuclear Regulatory Commission for the renewal of Facility Operating Licenses DPR-80 and DPR-82, for Diablo Canyon Power Plant (DCPP) Units 1 and 2, respectively. The application included the Applicant's Environmental Report -
Operating License Renewal Stage.
PG&E Letter DCL-10-126, "Response to NRC Letter dated September 1, 2010, Request for Additional Information (Set 22) for the Diablo Canyon License Renewal Application," dated September 30, 2010, indicated that marine growth will be removed in all accessible areas of the discharge conduits during 2R16 (2011) and 1 R1 7 (2012). The requirements for future inspections, including those to be performedduring the period of extended operation, will be developed based on the finding from the 2R16/1R17 inspections. These requirements will address the following: (1) inspection interval (not to exceed 5 years); (2) extent and frequency of marine growth removal; and (3) inspection extent (100 percent vs. sampling).
PG&E has revised its schedule for removing marine growth in all accessible areas of the Unit 2 discharge conduit. During 2R16, PG&E plans to use a new alternate methodology and equipment on a portion of the accessible areas of the Unit 2 discharge conduit to validate and streamline the tunnel surface cleaning. Marine growth removal and subsequent inspection of all required areas of the Unit 1 and Unit 2 discharge conduits will be completed prior to the period of extended operation. The Unit 2 discharge conduit is currently scheduled to be completed during 2R17 (2013). The Unit 1 discharge conduit is currently scheduled to be completed during 1 R1 7 (2012). The requirements for future inspections, including those to be performed during the period of extended operation, will be developed based on the findings from the 1R17/2R17 inspections. These requirements will address the following: (1) inspection interval (not to exceed 5 years); (2) extent and A member of the STARS (Strategic Teaming and Resource Sharing)
Alliance A '39 Callaway.
Comanche Peak
- Diablo Canyon
- Palo Verde
- San Onofre
- South Texas Project
- Wolf Creek
Document Control Desk March 25, 2011 Page 2 PG&E Letter DCL-1 1-036 frequency of marine growth removal; and (3) inspection extent (100 percent vs.
sampling). Refer to amended License Renewal Application (LRA) Table A4-1. LRA, Section B2.1.32, Structures Monitoring Program, states: "The Intake Structure continues to require attention and remediation due to its location in a harsh coastal environment. As a result of a negative trend in concrete degradation, the Intake was placed back into Maintenance Rule goal setting (a)(1) status in December 2005. A repair plan is in place in order to return the Intake Structure to (a)(2) status by 2010."
PG&E has revised its schedule to return the Intake Structure to (a)(2) status due to an increase in the amount of repairs required. The Intake Structure is currently scheduled to be returned to (a)(2) status by the end of 2011. The Intake Structure will be returned to (a)(2) status prior to the period of extended operation. Refer to amended LRA Table A4-1. The schedule change supersedes the schedule described in LRA Section B2.1.32.
The enclosure contains LRA Amendment 43, which contains the affected LRA pages with changes shown as electronic markups (deletions crossed out and insertions underlined).
If you have any questions regarding this response, please contact Mr. Terence L. Grebel, License Renewal Project Manager, at (805) 545-4160.
I declare under penalty of perjury that the foregoing is true and correct.
Executed on March 25, 2011.
"-,ý C..---
James R. Becker Site Vice President gwh/50381916 / 50382232 Enclosure cc:
Diablo Distribution cc/enc: Elmo E. Collins, NRC Region IV Regional Administrator Nathanial B. Ferrer, NRC Project Manager, License Renewal Kimberly J. Green, NRC Project Manager, License Renewal Michael S. Peck, NRC Senior Resident Inspector Alan B. Wang, NRC Licensing Project Manager A member of the STARS (Strategic Teaming and Resource Sharing)
Alliance Callaway
- Comanche Peak
- Diablo Canyon a Palo Verde a San Onofre a South Texas Project
- Wolf Creek
Enclosure PG&E Letter DCL-1 1-036 Page 1 of 2 LRA Amendment 43 Affected LRA Section Table A4-1
Enclosure PG&E Letter DCL-11-036 Page 2 of 2 Appendix A Final Safety Analysis Report Supplement Table A4-1 License Renewal Commitments Item #
Commitment LRA Implementation Section Schedule 69 Marine growth removal and subsequent inspection of all required areas of the Unit I and Unit B2.1.32 Prior to the period of 2 discharge conduits will be completed prior to the period of extended operation. The Unit 2 extended operation discharge conduit is currently scheduled to be completed during 2R17 (2013). The Unit I discharge conduit is currently scheduled to be completed during IRi17 (2012).
70 The requirements for future discharge conduit inspections including those to be performed Prior to the period of during the period of extended operation will be developed based on the findings from the IRi 7 extended operation.
/ 2R1 7 inspections. These requirements will address the following: (1) inspection interval (not to exceed 5 years); (2) extent and frequency of marine growth removal; and (3) inspection extent (100 percent vs. sampling).
71 The Intake Structure will be returned to (a)(2) status prior to the period of extended operation.
B2.1.32 Prior to the period of The Intake Structure is currently scheduled to be returned to (a)(2) status by the end of 2011 1
extended operation