DCL-09-038, Supplement to Nine Month Response to NRC Generic Letter 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems
| ML091540018 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/26/2009 |
| From: | Becker J Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| DCL-09-038, GL-08-001 | |
| Download: ML091540018 (3) | |
Text
Pacific Gas and Electric Company James R. Becker Site Vice President Diablo Canyon Power Plant Mail Code 104/5/601 P 0. Box 56 Avila Beach, CA 93424 805.545.3462 Internal: 691.3462 Fax: 805.545.6445 May 26, 2009 PG&E Letter DCL-09-038 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852 Docket No. 50-275, OL-DPR-80 Diablo Canyon Unit 1 10 CFR 50.54(f)
Subject:
Reference 1:
Reference 2:
Reference 3:
Supplement to Nine Month Response to NRC Generic Letter 2008-01, "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems" NRC Generic Letter 2008-01., "Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems," dated January 11, 2008 PG&E Letter DCL-08-032, "Three-Month Response to NRC Generic Letter 2008-01, 'Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems,"'
dated April 10, 2008 PG&E Letter DCL-08-090, "Nine-Month Response to NRC Generic Letter 2008-01, 'Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems,"'
dated October 14, 2008
Dear Commissioners and Staff:
The U. S. Nuclear Regulatory Commission (NRC) issued NRC Generic Letter (GL) 2008-01 (Reference 1) to request that each licensee evaluate its Emergency Core Cooling System, Residual Heat Removal System, and Containment Spray System licensing basis, design, testing, and corrective actions to ensure that gas accumulation is maintained less than the amount that challenges operability of these systems, and that appropriate action is taken when conditions adverse to quality are identified.
A member of the STARS (Strategic Teaming and Resource Sharing)
Alliance Callaway Comanche Peak
- Diablo Canyon
- Palo Verde San Onofre South Texas Project Wolf Creek
Document Control Desk SMay 26, 2009 Page 2 PG&E Letter DCL-09-038 In Reference 2, PG&E made the following commitment:
PG&E will perform any necessary confirmatory walkdowns of inaccessible piping in the Diablo Canyon Power Plant (DCPP) Unit 1 containment during Unit 1 Refueling Outage Fifteen (1 R1 5), currently scheduled to begin in January 2009. Any corrective actions that are identified that PG&E determines can reasonably be performed during 1 R1 5 will be completed during that refueling outage. Any other corrective actions that are identified during 1 R1 5 which cannot be completed will be implemented prior to restart following Unit 1 Refueling Outage Sixteen. PG&E will provide a supplemental submittal within 60 days of the completion of 1 R1 5 describing any corrective actions identified and their schedule for completion.
PG&E completed DCPP 1 R1 5 on March 24, 2009.
PG&E performed walkdowns during 1 R1 5 of inaccessible piping in the DCPP Unit I containment. PG&E did not identify any additional corrective actions beyond those previously provided in Reference 3.
PG&E used an enhanced system restoration procedure when coming out of 1 R1 5 to flush gas out of the system. Post outage ultrasonic testing verifications were performed a month after the outage and no gas accumulation was detected.
This response is submitted in accordance with 10 CFR 50.4.
PG&E makes no regulatory commitments (as defined by NEI 99-04) in this letter.
This letter includes no revisions to existing regulatory commitments.
If there are any questions or if additional information is needed, please contact Stan Ketelsen at 805-545-4720.
I state under penalty of perjury that the foregoing is true and correct.
Executed on May 26, 2009.
Since ely, James ecker Site Vice Pre dent A
member of the STARS (Strategic Teaming and Resource Sharing)
Alliance Callaway
- Comanche Peak o Diablo Canyon Palo Verde
- San Onofre o South Texas Project o Wolf Creek
S Document Control Desk May 26, 2009 a
Page 3 PG&E Letter DCL-09-038 mjrm/4557/50037662 cc:
Alan B. Wang, Project Manager, Office of Nuclear Reactor Regulation Gary W. Butner, California Department of Public Health Elmo E. Collins, NRC Region IV Michael S. Peck, NRC, Senior Resident Inspector Diablo Distribution A
member of the STARS (Strategic Teaming and Resource Sharing)
Alliance Callaway
- Comanche Peak -
Diablo Canyon o Palo Verde o San Onofre,
South Texas Project
- Wolf Creek