ML17244A269
| ML17244A269 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 08/29/2017 |
| From: | Simril T Duke Energy Carolinas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17244A221 | List: |
| References | |
| CNS-17-043 | |
| Download: ML17244A269 (6) | |
Text
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CNS-17-043 August 29, 2017 AITN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Duke Energy Carolinas, LLC (Duke Energy)
Catawba Nuclear Station (CNS), Units 1 and 2 Docket Number(s) 50-413 and 50-414 Renewed License Nos. NPF-35 and NPF-52 Tom Simril Vice President Catawba Nuclear Station Duke Energy CN01VP I 4800 Concord Road York, SC 29745 o: 803. 701.3340 f: 803.701.3221 tom.simril@duke-energy.com 10 CFR 50.54(f) 10 CFR 50.4
Subject:
Catawba Nuclear Station High Frequency Supplement to Seismic Hazard Screening Report, Response NRC Request for Information Pursuant to 10 CFR 50.54(f)
Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident
References:
- 1. NRC Letter, Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendations 2.1, 2.3, and 9.3, of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated March 12, 2012, ADAMS Accession Number ML12053A340
- 2. NEI Letter, Final Draft of Industry Seismic Evaluation Guidance, Screening, Prioritization and Implementation Details (SPID) for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic {EPRI 1025287), dated November 27, 2012, ADAMS Accession Number ML12333A168 and ML12333A170
- 3. NRC Letter, Endorsement of Electric Power Research Institute Final Draft Report 1025287, "Seismic Evaluation Guidance, Screening, Prioritization and Implementation Details (SPID) for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic", dated February 15, 2013, ADAMS Accession Number ML12319A074
- 4. Guidance: Augmented Approach for the Resolution of Fukushima Near-Term Task Force Recommendation 2.1: Seismic," as an Acceptable Alternative to the March 12, 2012, Information Request for Seismic Reevaluations, dated May 7, 2013, ADAMS Accession Number ML13106A331
- 5. Seismic Hazard and Screening Report (CEUS Sites), Response to NRC 10 CFR 50.54(f) Request for Additional Information Pursuant to Title 1 O of the Code of Federal www.duke-energy.com ftDtD f\\),e (<_
U.S. Nuclear Regulatory Commission CNS-17-043 Page J 2 August29,2017 Regulations 50.54(f) regarding Recommendations 2.1, 2.3 and 9.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated*March 31, 2014, ADAMS Accession Number ML14093A052
- 6. NRC Letter, Screening and Prioritization Results regarding information pursuant to Title 1 O of the Code of Federal Regulations 50.54(f) regarding seismic Hazard Reevaluations for Recommendation 2.1 of the Near-Term Task Force Reviews of Insights from the Fukushima Dai-ichi accident, dated May 9, 2014, ADAMS Accession Number ML14111A147
- 7. NRC Letter, Final Determination of Licensee Seismic Probabilistic Risk Assessments Under the Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 "Seismic" of the Near-Term Task Force Review of Insights from the Fukushima Dai-lchi Accident, dated October 27, 2015, ADAMS Accession Number ML15194A015
- 8. NEI Letter, Request for NRC Endorsement of High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396),
dated July 30, 2015, ADAMS Accession Number ML15223A100 and ML15223A102
- 9. NRC Letter to NEI: Endorsement of Electric Power Research Institute Final Draft Report 3002004396: "High Frequency Program: Application Guidance for Functional Confirmation and Fragility", dated September 17, 2015, ADAMS Accession Number ML15218A569
- 10. Duke Energy letter, Supplemental Information Regarding Reevaluated Seismic Hazard Screening and Prioritization Results - Response to NRC Request for Information Pursuant to 1 O CFR 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights from the Fukushima Dai-ichi Accident, dated October 20, 2016, ADAMS Accession ML16295A342
- 11. NRC Letter, Catawba Nuclear Station, Units 1 and 2 and McGuire Nuclear Station, Units 1 and 2, Screening and Prioritization results regarding Seismic Hazard Reevaluations for Recommendation 2.1 of the Near-Term Task Force review of Insights from the Fukushima Dai-lchi Accident, dated December 22, 2016, ADAMS Accession Number ML16344A313 On March 12, 2012, the Nuclear Regulatory Commission (NRC) issued a Request for Information per 1 O CFR 50.54(f) (Reference 1) to all power reactor licensees. The required response section of Enclosure 1 indicated that licensees should provide a Seismic Hazard Evaluation and Screening Report within 1.5 years from the date of the letter for Central and Eastern United States (CEUS) nuclear power plants. By NRC letter dated May 7, 2013 (Reference 4), the date to submit the report was extended to March 31, 2014.
In response to the 50.54(f) letter, CNS submitted the reevaluated seismic hazards on March 31, 2014 (Reference 5). By letter dated May 9, 2014, (Reference 6), the NRC transmitted the initial results of the screening and prioritization review of the seismic hazards reevaluation submittal for CNS. In accordance with the screening, prioritization, and implementation details report (SPID) and Augmented Approach guidance (References 2, 3 and 4), the reevaluated seismic hazard is used to determine if additional seismic risk evaluations are warranted for a plant. As
U.S. Nuclear Regulatory Commission CNS-17-043 Page 13 August 29, 2017 noted in the May 9, 2014, letter, CNS is to conduct limited-scope evaluations (i.e., spent fuel pool, and high frequency).
Within the May 9, 2014, letter (Reference 6), NRC acknowledged that these limited scope evaluations will require additional development of the assessment process. By Reference 8, Nuclear Energy Institute (NEI) submitted an Electric Power Research Institute (EPRI) report entitled, High Frequency Program: Application Guidance for Functional Confirmation and Fragility Evaluation (EPRI 3002004396) for NRC review and endorsement. NRC endorsement was provided by Reference 9.
By letter dated October 27, 2015, the NRC issued its final determination to (1) inform power reactor licensees of the remaining seismic evaluations that each licensee will perform, (2) inform those licensees that will perform a Seismic Probabilistic Risk Assessment SPRA, and (3) establish the associated due dates for the seismic evaluations and SPRAs to complete licensees' responses to the 50.54(f) letter. For CNS the October 27, 2015, letter stated that SPRAs were judged to be warranted, based on the information available to the NRC at that time, primarily based on containment type (ice condenser containment).
On September 14, 2016, a public meeting was held to discuss additional information which provided a technical basis for reconsideration of the decision to necessitate SPRAs for CNS.
By letter dated October 20, 2016, (Reference 10), the topics discussed during the public meeting and the corresponding site-specific information for CNS were submitted.
The October 20, 2016, submittal stated that the seismic risk at Catawba and McGuire is not significant and performance of SPRAs would not provide meaningful additional risk insights for the sites because of the significant body of knowledge already available. Specifically, Duke cited reevaluated seismic hazard and associated seismic demand-versus-capacity information, previous generic and site-specific seismic risk evaluations, and site-specific Conditional Containment Failure Probability (CCFP) analyses.
By Letter dated December 22, 2016, (Reference 11 ), the NRC staff concluded that the plant-specific combination of seismic hazard exceedances, the general estimation of the Seismic Core Damage Frequency (SCDF), and the insights related to the CCFP at CNS indicate that the increase in seismic risk due to the reevaluated seismic hazard is addressed within the margin inherent in the design and that a SPRA is not warranted. Therefore, SPRA for CNS is no longer necessary to fulfill the response to the seismic portion of the 50.54(f) letter. Further, high frequency evaluation and mitigating strategies assessment continue to be necessary to gain insights into CNS response to high frequency ground motion and to ensure that mitigating strategies capabilities address the reevaluated seismic hazard conditions.
CNS has performed a High Frequency Confirmation evaluation in response to the NRC's 50.54(f) letter using the methods in EPRI report 3002004396. The enclosure to this letter provides the Seismic High Frequency Confirmation Report for CNS. This completes the scope of work described in Section 4.2 of Reference 5, for CNS.
U.S. Nuclear Regulatory Commission CNS-17-043 Page 14 August 29, 2017 This letter contains no new Regulatory Commitments and no revision to existing Regulatory Commitments.
Should you have any questions regarding this submittal, please contact Cecil A. Fletcher II, Catawba Nuclear Regulatory Affairs Manager, at (803) 701-3622.
I declare under penalty of perjury that the foregoing is true and correct. Executed on August 29, 2017.
Sincerely, Tom Simril Vice President, Catawba Nuclear Station
Enclosure:
50.54(f) NTTF 2.1 Seismic High Frequency Confirmation for Catawba Nuclear Station
U.S. Nuclear Regulatory Commission CNS-17-043 Page I 5 August 29, 2017 xc (with enclosures):
Catherine Haney Regional Administrator U.S. Nuclear Regulatory Commission - Region II Marquis One Tower 245 Peachtree Center Ave., NE Suite 1200 Atlanta, GA 30303-1257 Juan F. Uribe U.S. Nuclear Regulatory Commission One White Flint North, Mailstop 0-13F10 11555 Rockville Pike Rockville, MD 20852-2738 Michael Mahoney NRC Project Manager (CNS)
U.S. Nuclear Regulatory Commission One White Flint North, Mail Stop 0-8H4A 11555 Rockville Pike Rockville, MD 20852-2738 Joseph D. Austin NRC Senior Resident Inspector Catawba Nuclear Station
U.S. Nuclear Regulatory Commission CNS-17-043 Enclosure August 29, 2017 Enclosure 50.54(f) NTTF 2.1 Seismic High Frequency Confirmation for Catawba Nuclear Station