DCL-12-053, Correction to Capacity of Component Cooling Water (CCW) Surge Tank Relief Valve (RV-45)
| ML12151A014 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 05/28/2012 |
| From: | Becker J Pacific Gas & Electric Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| DCL-12-053 | |
| Download: ML12151A014 (2) | |
Text
Pacific Gas and Electric Company May 28,2012 PG&E Letter DCL-12-'Q53 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 James R. Becker Site Vice President Diablo Canyon Power Plant Mail Code 104/6 P. o. Box 56 Avila Beach, CA 93424 805.545.3462 Internal:
691.3462 Fax: 805.545.6445 Correction to Capacity of Component Cooling Water (CCW) Surge Tank Relief Valve (RV-45) Dear Commissioners and Staff: In Pacific Gas and Electric Company (PG&E) Letter DCL-99-042, "Supplement to License Amendment Request 97-05 Revision of Technical Specification 3/4.7.3.1," dated March 12, 1999, PG&E responded to requests for additional information from the NRC regarding the Component Cooling Water (CCW) surge tank pressurization system. PG&E's response to NRC Question 13 in DCL-99-042 provided the capacity of the CCW Surge Tank Relief Valve RV-45 as 483 gallons per minute (gpm). During a review of the system as part of the Diablo Canyon Power Plant (DCPP) Licensing Basis Verification Project, PG&E identified that the capacity given in this response was incorrect.
The issue was entered into the DCPP corrective action program as SAP Notification 50429853.
PG&E reviewed procurement documentation associated with the capacity of RV-45 and determined that the certified capacity of the originally installed RV-45 in Unit 1 and Unit 2 is 255 gpm for water service. Additionally, PG&E determined that the certified capacity, or the flow rate at which the valves were tested, was based upon the original PG&E purchase specification required capacity (250 gpm for water service).
Subsequently, PG&E contracted with the valve vendor (Tyco Flow Control) to analytically determine the two original RV's actual capacities.
The analysis determined that the ASME rated capacity for water service for each is 482 gpm. Note that PG&E maintains a third, spare RV-45 that is periodically swapped with the two original relief valves, for maintenance.
The certified capacity of the third RV-45 is 483 gpm for water service. A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
- Comanche Peak
- Diablo Canyon
- Palo Verde
- South Texas Project
- Wolf Creek Document Control Desk May 28,2012 Page 2 PG&E Letter DCL-12-053 Regardless of the higher actual RV-45 capacities, PG&E has incorporated the lower RV capacity (255 gpm for water service) into the design basis and determined that the CCW System continues to meet its acceptance criteria.
The purpose of this letter is to inform the NRC that incorrect statements were made and PG&E has taken corrective actions to resolve the issue. PG&E makes no regulatory commitments (as defined by NEI 99-04) in this letter. Questions concerning this letter should be directed to Mr. Mark Sharp (805) 305-9366.
I state under penalty of perjury that the foregoing is true and correct. Executed on May 2 , MAS/50429853 cc: Elmo E. Collins, NRC Region IV Ron Kopriva, NRC Senior Reactor Inspector, Region IV Eric Nelson, PG&E Michael S. Peck, NRC Senior Resident Inspector Joseph M. Sebrosky, NRR Project Manager Alan B. Wang, NRR Project Manager A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway
- Comanche Peak
- Diablo Canyon
- Palo Verde
- South Texas Project
- Wolf Creek