ML13358A065
| ML13358A065 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 01/14/2014 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Koehl D South Texas |
| Singal B | |
| References | |
| TAC MF1110, TAC MF1111 | |
| Download: ML13358A065 (5) | |
Text
Mr. Dennis L. Koehl President and CEO/CNO UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 14, 2014 STP Nuclear Operating Company South Texas Project P.O. Box 289 Wadsworth, TX 77483
SUBJECT:
SOUTH TEXAS PROJECT, UNITS 1 AND 2-REQUEST FOR ADDITIONAL INFORMATION REGARDING FUKUSHIMA LESSONS LEARNED-FLOODING HAZARD REANALYSIS REPORT (TAC NOS. MF111 0 AND MF1111)
Dear Mr. Koehl:
By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 1 0 of the Code of Federal Regulations, Section 50.54(f)
(hereafter referred to as the 50.54(f) letter). The request was issued as a part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to perform a flood hazard reevaluation using present-day methodologies anp guidance.
By letter dated March 11, 2013 (Agencywide. Documents Access and Management System (ADAMS) Accession No. ML13079A806), STP Nuclear Operating Company (STPNOC) submitted a response to Enclosure 2, Required Response 2 of the 50.54(f) letter. The NRC staff has determined that additional information is needed to complete its review.
This request was discussed with Ms. Wendy Brost of your staff on January 9, 2014, and it was agreed that STPNOC would input files for the numerical models used for the analysis by January 22, 2014, and provide a complete response to the RAI by February 13, 2014.
If you have any questions, please contact me at 301-415-3016 or via e-mail at Balwant.Singal@nrc.gov.
Docket Nos. 50-498 and 50-499
Enclosure:
Request for Additional Information cc w/encl: Distribution via Listserv Sincerely,
~0
() *. :t tJl)~'K B~l~n~l, Senior Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
REQUEST FOR ADDITIONAL INFORMATION FUKUSHIMA LESSONS LEARNED FLOODING HAZARD REEVALUATION REPORT STP NUCLEAR OPERATING COMPANY SOUTH TEXAS PROJECT, UNITS 1 AND 2 DOCKET NOS. 50-498 AND 50-499 By letter dated March 12, 2012, the U.S. Nuclear Regulatory Commission (NRC) issued a request for information pursuant to Title 1 0 of the Code of Federal Regulations, Section 50.54(f)
{hereafter referred to as the 50.54(f) letter). The request was issued as a part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 2 to the 50.54(f) letter requested licensees to perform a flood hazard reevaluation using present-day methodologies and guidance.
By letter dated March 11, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13079A806), STP Nuclear Operating Company (STPNOC) submitted a response to Enclosure 2, Required Response 2 of the 50.54(f) letter. The NRC staff has determined that the following additional information is needed to complete its review.
RAI 1: Local Intense Precipitation and Associated Site Drainage Please provide electronic versions of the input files used for HEC-HMS analysis in the flood hazard reevaluation report (FHRR) related to the local intense precipitation analyses.
RAI2: Local Intense Precipitation and Associated Site Drainage Please provide electronic versions of the input files used for HEC-RAS analysis in the FHRR related to local intense precipitation analyses.
RAI 3: Local Intense Precipitation and Associated Site Drainage Please provide descriptions of the sources of elevation data, the methods used to incqrporate elevation measurements into local intense precipitation flood analysis, and the likely magnitude of the errors associated with these elevations.
RAI 4: Local Intense Precipitation and Associated Site Drainage Please provide a description of the basis used to classify Probable Maximum Flood (PMF) flow as shallow concentrated flow used in the Natural Resources Conservation Service (NRCS) TR-55 methodology.
Enclosure.
RAI 5: Failure of Dams and Onsite Water Control/Storage Structures Please provide details of the ineffective flow areas and levees that were removed from the Halff Associates, Inc. HEC-RAS model while developing the HEC-RAS model used to reevaluate the flood hazard from upstream dam failures at the South Texas Project (STP), Units 1 and 2 site.
Also, please provide a justification for removal of these features.
RAI 6: Failure of Dams and Onsite Water Control/Storage Structures Please provide details of the intra-basin flows that were allowed to occur in the HEC-RAS model. Also, because allowing intra-basin flows would reduce the discharge at STP, Units 1 and 2 site, the licensee is requested to provide a justification how the flood hazard from upstream dam failures would still be conservative.
RAI 7: Failure of Dams and Onsite Water Control/Storage Structures Please provide electronic versions of the input files used for HEC-RAS analysis in the FHRR related to upstream dam failures.
RAI 8: Failure of Dams and Onsite Water Control/Storage Structures Please provide the electronic version of National Weather Service (NWS) BREACH model input files used in the recent Main Cooling Reservoir (MCR) breach analyses of the three postulated breach locations described in FHRR Section 2.3.
RAI 9: Failur:e of Dams and Onsite Water Control/Storage Structures Please provide a description of model configuration, boundary conditions, and model parameters for the three RMA2 simulations. Also, Please provide the RMA2 input files, including the computational grids, used for the three simulations.
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ML13358A065 Sincerely,
/RAJ Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
- Email dated 12/18/13 OFFICE NRR/DORULPL4-1/PM NRR/DORULPL4-1/LA NRO/DSEA/RHMB NRR/DORULPL4-1 /BC NRR/DORULPL4-1 /PM NAME BSingal JBurkhardt CCook*
MMarkley BSingal DATE 01/13/14 12/24/13 01/09/14 01/14/14 01/14/14