ML052910430
| ML052910430 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 09/15/2005 |
| From: | Rosalyn Jones Duke Power Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| Download: ML052910430 (6) | |
Text
Duke RONALD A JONES Vice President
- IDPower, Oconee Nuclear Site Duke Power ONOI VP / 7800 Rochester Hwy.
Seneca, SC 29672 864 885 3158 September 15,2005 864 885 3564 fax U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Document Control Desk
Subject:
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST ASSOCIATED WITH NEW REACTOR BUILDING EMERGENCY SUMP (RBES)
STRAINERS Oconee Nuclear Station Units 1,2,&3 Docket Numbers 50-269, 270, and 287 By letter dated August 18, 2005, Duke Energy Corporation submitted a License Amendment Request proposing to amend Appendix A, Technical Specifications (TS), for Renewed Facility Operating Licenses DPR-38, DPR-47, and DPR-55 for Oconee Nuclear Station (ONS) Units 1,2, and 3. The proposed change to Technical Specification Surveillance Requirement (SR) 3.5.2.6 and SR 3.5.3.6 is needed to reflect the replacement of Reactor Building Emergency Sump (RBES) suction inlet trash racks and screens with strainers in response to Generic Letter 2004-02.
On September 9, 2005, ONS received a Request for Additional Information by electronic mail. The RAI consists of three questions related to the TS Change Request. The response to those questions is included as Attachment 1 to this letter.
If you have further questions or need additional information, please contact Russ Oakley at (864) 885-3829.
Ve ours,.
R es, Vice President Oconee Nuclear Site www. dukepower. corn
U. S. Nuclear Regulatory Commission September 15, 2005 Page 2 xc xv/
Attachment:
W. D. Travers U. S. Nuclear Regulatory Commission Regional Administrator, Region II Atlanta Federal Center 61 Forsyth St., SW, Suite 23T85 Atlanta, GA 30303 L. N. Olshan (Addressee Only)
NRC Senior Project Manager (ONS)
U. S. Nuclear Regulatory Commission Mail Stop 0-8 H12 Washington, DC 20555-0001 M. E. Shannon Senior Resident Inspector (ONS)
U. S. Nuclear Regulatory Commission Oconee Nuclear Site Henry Porter Division of Radioactive Waster Management South Carolina Bureau of Land and Waste Management 2600 Bull Street Columbia, SC 29201
ll)/18/05 TUE 13: 11 F1-AX 84 88b 34U1 UNS bAl1"Y ASSUMANUE wfi1 UU1 U. S. Nuclear Regulatory Commission September 15, 2005 Page 3 bxc w/
Attachment:
R. L. Gill - NAID L. A. Keller - CNS C. J. Thomas - MNS B. G. Davenport R. L. Oakley R. J. Freudenberger S. D. Capps L. J. Azzarello Lisa F. Vaughn Paul M. Stovall David B. Coyle T. P. Gillespie Robert L. Medlin NSRB, EC05N NRIAFileJELL ECO50 Oconee Master File - ON03DM (File T. S. Working)
U. S. Nuclear Regulatory Commission September 15, 2005 Page 4 I affirm that I, R. A. Jones, Vice President, Oconee Nuclear Station, Duke Energy Corporation, am the person who subscribed my name to the foregoing, and that all the matters and facts herein are true and correct to the best of my knowledge.
R. A. Jone Oconee Ni le President Station Subscribed and sworn to before me this.4l L-... day of 1S r
I 2 Y, 2005.
Notary Public My commission expires:
2- _zo -2o 7
Attachment I Page 1 of 2 ATTACHMENT 1 RAIs for Sump Strainer Technical Specification Change
I Page 2 of 2 RAIs for Siimp Strainer Technical Specification Change
- 1. The change requested replaces the term "trash racks and screens" with the term "strainers". Attachment 3 states, "The new term "strainers" is also appropriate for the existing design that uses trash racks and screens to strain debris from the suction inlet." For those plants not being modified, how is the licensee going to ensure that the definition of the term "strainers" will include both the existing trash racks and screens?
The use of the term "strainers" in place of "trash racks and screens" is relevant only to the surveillance, which requires the sump strainers to be inspected for evidence of structural distress or abnormal corrosion. The term "strainer", being more generic, encompasses all straining elements of the structure. For the existing sumps (units not modified), the term "strainer" would encompass the surrounding grating (trash rack),
the screen mesh, and the fit between these elements and supporting members of the structure. For new (modified) sumps, the term "strainer" would apply to the perforated plate which performs the straining function and the fit between this plate and all supporting members. Inspection procedures (applicable to all 3 units) are being revised to use the generic term and clarify inspection requirements.
- 2. Attachment 4 provides information indicating that the new strainer design has been evaluated for missiles, jet impingement, and structural distress due to debris. The evaluation does not mention seismic considerations in any way. Was a seismic evaluation performed? What did it include?
Seismic loading (Maximum Hypothetical Earthquake) was included in the structural analysis for the modified sump. This was one of several loads considered, including dead weight, live loads, differential pressure, and thermal loads.
- 3. Attachment 4 states that the strainer was evaluated against jet impingement from HELB and missile impact. No evaluation of pipe whip has been noted in the evaluation. The staff would like to review the evaluation conducted for jet impingement, missile impact, and any evaluation of pipe whip that the licensee may have conducted.
The evaluations for jet impingement and pipe whip effects (S-003) and for missile protection (S-002) were provided in electronic format to the NRC staff via electronic mail on September 15, 2005.