ML060410214
| ML060410214 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 02/08/2006 |
| From: | Archie J South Carolina Electric & Gas Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GL-04-002, RC-06-0030 | |
| Download: ML060410214 (2) | |
Text
Jeffrey B. Archie Vice President, Nuclear Operations 803.345.4214 February 8, 2006 A SCANA COMPANY RC-06-0030 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Dear Sir/Madam:
Subject:
VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)
DOCKET NO. 50/395 OPERATING LICENSE NO. NPF-12 SUPPLEMENTAL RESPONSE TO NRC GENERIC LETTER 2004-02:
POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS
Reference:
- 1. J. B. Archie to Document control Desk, Response to NRC Generic Letter 2004-02, dated September 1, 2005, RC-05-0138
- 2.
J. B. Archie to Document Control Desk, 90 Day Response to NRC Generic Letter 2004-02, dated March 7, 2005, RC-05-0037 This letter provides the South Carolina Electric & Gas Company (SCE&G) follow-up to the supplemental response to Generic Letter 2004-02 for VCSNS (Reference 1) that provided details requested in Part 1 of the generic letter. Reference 2 above provided SCE&G's initial response for the request for information in Part 1 of the generic letter.
As stated in Reference 1, a strainer vendor had not been selected as of the submittal date.
A contract was awarded to Atomic Energy of Canada, Limited (AECL) in December of 2005 to design and fabricate replacement recirculation sump strainers.
Two separate and independent strainers will be installed, one for each train. Each of the two strainers will provide a suction source for one Residual Heat Removal pump and one Containment Spray pump. As detailed in Reference 1, the analysis for VCSNS determined a minimum sump strainer surface area of 1400 ft2 to preclude thin bed formation. This area includes a 300 ft2 margin to address chemical effects. While the AECL strainer design is not finalized, the surface area will be in excess of 2000 ft2 per strainer providing substantial margin to thin bed formation.
The contract with AECL includes testing to validate the design head loss. The fabrication will be completed in time to support installation during the fall 2006 refueling outage at VCSNS.
SCE&G I Virgil C. Summer Nuclear Station
- P. 0. Box 88. Jenkinsville, South Carolina 29065
- T (803) 345.5209
- www.scana.com
Document Control Desk RC-06-0030 Page 2 of 2 Should you have questions, please call Mr. Robert Sweet at (803) 345-4080.
1 certify under penalty of perjury that the foregoing is true and correct.
- /d G xecuted on JT/JBA/mb ic/
Jeffrey N.
Opchie
- Il\\icle President, Nuclear Operations c:
N. 0. Lorick S. A. Byrne N. S. Carns J. H. Hamilton R. J. White W. D. Travers R. E. Martin K. Leonelli NRC Resident Inspector NSRC CER (0-C-04-291 1)
File (815.14)
DMS (RC-06-0030)