ML081780330
| ML081780330 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 07/10/2008 |
| From: | Thomas Wengert NRC/NRR/ADRO/DORL/LPLIII-2 |
| To: | Allen B FirstEnergy Nuclear Operating Co |
| Wengert, Thomas J, NRR/DORL, 415-4037 | |
| References | |
| GL-04-002, TAC MD4681 | |
| Download: ML081780330 (6) | |
Text
July 10, 2008 Mr. Barry S. Allen Site Vice President FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station Mail Stop A-DB-3080 5501 North State Route 2 Oak Harbor, OH 43449-9760
SUBJECT:
DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO RESPONSE TO GENERIC LETTER 2004-02, POTENTIAL IMPACT OF DEBRIS BLOCKAGE ON EMERGENCY RECIRCULATION DURING DESIGN BASIS ACCIDENTS AT PRESSURIZED-WATER REACTORS (TAC NO. MC4681)
Dear Mr. Allen:
By letter to the Nuclear Regulatory Commission (NRC) dated February 28, 2008, FirstEnergy Nuclear Operating Company submitted a supplemental response to Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors for Davis-Besse Nuclear Power Station, Unit No. 1 (DBNPS).
The cognizant NRC staff has reviewed the licensee's submittal. The process involved detailed review by a team of 10 subject matter experts, with focus on the review areas described in the NRC's Revised Content Guide for Generic Letter 2004-02 Supplemental Responses, (Agencywide Documents Access and Management System Accession No. ML073110389). The review process also included a separate holistic review of the licensee's submittal, informed by inputs from the subject matter experts that focused on whether the licensee has demonstrated overall that its corrective actions for GL 2004-02 are adequate.
The NRC staff has no further questions at this time regarding the performance of DBNPSs emergency core cooling system strainers. In large part, this conclusion is based on the very low potential debris loading at DBNPS, as discussed in the licensee's supplemental response.
However, the NRC staff has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on June 25, 2008, it was agreed that you would provide a response within 90 days of issuance of the final NRC staff safety evaluation on WCAP-16793.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC=s goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-4037.
Sincerely,
/RA/
Thomas J. Wengert, Project Manager Plant Licensing Branch III-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-346
Enclosure:
Request for Additional Information cc w/encl: See next page
ML081780330 NRR-088 OFFICE LPL3-2/PM LPL3-2/LA DSS/SSIB/BC LPL3-2/BC NAME TWengert EWhitt MScott RGibbs (CGratton for)
DATE 7/2/08 7/2/08 7/8/08 7/10/08
Davis-Besse Nuclear Power Station, Unit No. 1 cc:
Manager, Site Regulatory Compliance FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station Mail Stop A-DB-3065 5501 North State Route 2 Oak Harbor, OH 43449-9760 Director, Ohio Department of Commerce Division of Industrial Compliance Bureau of Operations & Maintenance 6606 Tussing Road P.O. Box 4009 Reynoldsburg, OH 43068-9009 Resident Inspector U.S. Nuclear Regulatory Commission 5503 North State Route 2 Oak Harbor, OH 43449-9760 Stephen Helmer Supervisor, Technical Support Section Bureau of Radiation Protection Ohio Department of Health 35 East Chestnut Street, 7th Floor Columbus, OH 43215 Carol OClaire, Chief, Radiological Branch Ohio Emergency Management Agency 2855 West Dublin Granville Road Columbus, OH 43235-2206 Zack A. Clayton DERR Ohio Environmental Protection Agency P.O. Box 1049 Columbus, OH 43266-0149 State of Ohio - Transportation Department Public Utilities Commission 180 East Broad Street Columbus, OH 43266-0573 Principal Assistant Attorney General Environmental Enforcement Section State Office Tower 30 East Broad Street, 25th Floor Columbus, OH 43215 President, Board of County Commissioners of Ottawa County Port Clinton, OH 43252 President, Board of County Commissioners of Lucas County One Government Center, Suite 800 Toledo, OH 43604-6506 The Honorable Dennis J. Kucinich United States House of Representatives Washington, D.C. 20515 The Honorable Dennis J. Kucinich United States House of Representatives 14400 Detroit Avenue Lakewood, OH 44107 Joseph J. Hagan President and Chief Nuclear Officer FirstEnergy Nuclear Operating Company Mail Stop A-GO-19 76 South Main Street Akron, OH 44308 David W. Jenkins, Attorney FirstEnergy Corporation Mail Stop A-GO-15 76 South Main Street Akron, OH 44308 Danny L. Pace Senior Vice President, Fleet Engineering FirstEnergy Nuclear Operating Company Mail Stop A-GO-14 76 South Main Street Akron, OH 44308
Davis-Besse Nuclear Power Station, Unit No. 1 cc:
Manager, Fleet Licensing FirstEnergy Nuclear Operating Company Mail Stop A-GO-2 76 South Main Street Akron, OH 44308 Director, Fleet Regulatory Affairs FirstEnergy Nuclear Operating Company Mail Stop A-GO-2 76 South Main Street Akron, OH 44308 Jeannie M. Rinckel Vice President, Fleet Oversight FirstEnergy Nuclear Operating Company Mail Stop A-GO-14 76 South Main Street Akron, OH 44308 Paul A. Harden Vice President, Nuclear Support FirstEnergy Nuclear Operating Company Mail Stop A-GO-14 76 South Main Street Akron, OH 44308 James H. Lash Senior Vice President of Operations and Chief Operating Officer FirstEnergy Nuclear Operating Company Mail Stop A-GO-14 76 South Main Street Akron, OH 44308
Enclosure REQUEST FOR ADDITIONAL INFORMATION DAVIS-BESSE NUCLEAR POWER STATION, UNIT NO. 1 DOCKET NO. 50-346 In reviewing the FirstEnergy Nuclear Operating Company=s (FENOC=s) submittal dated February 28, 2008, related to Generic Letter (GL) 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation during Design-Basis Accidents at Pressurized-Water Reactors, for the Davis-Besse Nuclear Power Station, Unit No. 1 (DBNPS), the Nuclear Regulatory Commission (NRC) staff has determined that the following information is needed in order to complete its review:
=
Background===
The NRC staff considers in-vessel downstream effects to be not fully addressed at DBNPS, as well as at other pressurized water reactors. DBNPS's GL 2004-02 submittal refers to draft WCAP-16793-NP, Evaluation of Long-Term Cooling Considering Particulate, Fibrous, and Chemical Debris in the Recirculating Fluid. The NRC staff has not issued a final safety evaluation (SE) for WCAP-16793-NP, nor is the NRC staff aware that satisfactory testing for a problem bed of debris at the core inlet has been performed for DBNPS plant conditions and fuel type.
FENOC may demonstrate that in-vessel downstream effects issues are resolved for DBNPS by showing that the licensee's plant conditions are bounded by the final WCAP-16793-NP and the corresponding final NRC staff SE, and by addressing the conditions and limitations in the final SE. Alternately, FENOC may resolve this item by demonstrating, without reference to WCAP-16793 or the NRC staff SE, that in-vessel downstream effects have been addressed at DBNPS.
Request for Additional information FENOC is requested to report how DBNPS has addressed the in-vessel downstream effects issue within 90 days of issuance of the final NRC staff SE on WCAP-16793. Note that the NRC staff is developing a Regulatory Issue Summary to inform the industry of the staff's expectations and plans regarding resolution of this remaining aspect of Generic Safety Issue 191.