ML17030A094
| ML17030A094 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/16/2017 |
| From: | Michael Orenak Plant Licensing Branch II |
| To: | |
| Orenak M, NRR/DORL/LPLII-1, 415-3229 | |
| References | |
| CAC MF8761, CAC MF8762 | |
| Download: ML17030A094 (5) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 16, 2017 LICENSEE: Southern Nuclear Operating Company.
FACILITY: Vogtle Electric Generating Plant, Unit Nos. 1 and 2
SUBJECT:
SUMMARY
OF JANUARY 18, 2017, PRE-LICENSING PUBLIC MEETING WITH SOUTHERN NUCLEAR OPERATING COMPANY, INC. TO DISCUSS THE INCORPORATION OF A SEISMIC PRA INTO THE 10 CFR 50.69 PROGRAM (CAC NOS. MF8761 AND MF8762)
On January 18, 2017, a Category 1 pre-licensing public meeting was held between the U.S.
Nuclear Regulatory Commission (NRC) staff and representatives of Southern Nuclear Operating Company, Inc. (SNC, the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of the meeting was to discuss an upcoming license amendment request to amend their Title 10 of the Code of Federal Regulations (10 CFR) 50.69 program to replace its seismic margins approach with a seismic Probabilistic Risk Assessment (PRA) for assessing the safety significance of structures, systems, and components at the Vogtle Electric Generating Plant (VEGP), Unit Nos. 1 and 2 .
The meeting notice and agenda, dated June 3, 2016, are located at Agencywide Documents Access and Management System (ADAMS) Accession No. ML16172A039. The licensee provided two handouts for the meeting: a high level slide presentation and a "proposed basis for change" document or draft license amendment request (LAR). The slide presentation is available in ADAMS at Accession No. ML17004A049. The proposed basis for change document can be found in ADAMS at Accession No. ML17004A058. A list of meeting attendees is provided in the enclosure to this meeting summary.
Meeting Summary After introductions, the licensee proceeded to the slide presentation, first providing an overview of the amendment request. The licensee stated that the current 10 CFR 50.69 program uses a seismic equipment list to determine the appropriate the Risk-Informed Safety Class (RISC) category. The licensee would like to use a seismic PRA in place of the seismic equipment list.
The NRC staff asked about the 10 CFR 50.69 inspection performed from June 13-30, 2016, and whether the inspection was solely on the 10 CFR 50.69 program. The licensee stated that the two week NRC inspection was focused solely on the 10 CFR 50.69 program.
The NRC staff inquired about the seismic safe shutdown equipment list (SSEL). The licensee stated that the seismic PRA will be the same one as provided in the Near Term Task Force Recommendation 2.1 response. The licensee stated that seismic PRA provides the true risk vs.
the SSEL, which only looks at two paths deterministically. The PRA uses more variables, such as human interaction and other hazards, and is not just a qualitative approach.
The NRC staff pointed out that the statements of consideration from the 10 CFR 50.69 rulemaking (69 FR 68008) contain specific language relating to seismic design requirements and recommended that the licensee ensure that their LAR is consistent with this language.
The NRC staff stated that they will be reviewing the application for ( 1) if the seismic PRA is of sufficient quality to correctly classify systems, structures and components (SSCs) according to their RISC and (2) to verify that the licensee's procedures for relaxing specific treatment requirements are consistent with 10 CFR 50.69.
The licensee stated that their Seismic PRA meets American Society of Mechanical Engineers (ASME) PRA Standard Addendum B. The NRC staff noted that Addendum B has not been endorsed by the NRC staff for risk-informed LARs and that Regulatory Guide (RG) 1.200, "An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities," (ADAMS Accession No. ML090410014) endorses only Addendum A.
A letter explaining the NRC staff's rationale for not endorsing Addendum B can be found at ADAMS Accession No. ML111720067.
Next, the licensee discussed the basis for the change document. The NRC staff inquired about the seismic fragilities of the seismic PRA. The licensee stated that the seismic fragilities were built into the model and reviewed during the peer review. The licensee stated they also incorporated the updated seismic hazard curves. The NRC staff stated that they would like to see a description of the changes being considered in the model within the application.
The NRC staff stated that a description of the peer review process the licensee used for the seismic PRA should be added to the application and that this description should explain what implementation level guidance (e.g., NEl-12-13) was used by the licensee to conduct the peer review.
The licensee stated that they do not intend to model FLEX for the application. The NRC staff stated that the LAR should include an explicit statement on how/whether FLEX equipment is modeled.
Finally, the licensee stated that they planned on submitting the amendment application at the end of February 2017.
One member of the public was in attendance. No Public Meeting Feedback Forms were received.
Please direct any inquiries to me at 301-415-3229 or Michael.Orenak@nrc.gov:
Sincerely,
~~ P-OrJv Michael D Orenak, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-424 and 50-425
Enclosure:
List of Attendees
LIST OF ATTENDEES JANUARY 18, 2017, PUBLIC MEETING WITH SOUTHERN NUCLEAR OPERATING COMPANY, INC.
REGARDING SEISMIC PRA ADDITION TO THE 50.69 PROGRAM VOGTLE ELECTRIC GENERATING PLANT, UNIT NOS. 1 AND 2 NAME ORGANIZATION Michael Orenak U.S. Nuclear Regulatory Commission (NRC)
Michael Markley NRC CJ Fong NRC Shilp Vasavada NRC Gary Wang NRC David Heeszel NRC Nilesh Chokshi NRC Steven Dinsmore NRC Mihaela Biro NRC Michael Dudek NRC (telephone)
Farhad Farzam NRC (telephone)
Ken McElroy Southern Nuclear Operating Company (SNC)
Pamela Burns SNC Faramarz Pournia SNC Owen Scott SNC Nicole Jackson SNC Jana Bergman Curtis Wright Enclosure
ML17030A094 *via email OFFICE NRR/DORL/LPL2-1/PM NRR/DORL/LPL2-1 /LA NRR/DRA/APLA/BC NAME MOrenak KGoldstein* SRosenberg DATE 02/13/2017 02/07/2017 02/15/2017 OFFICE NRR/DORL/LPL2-1 /BC NRR/DORL/LPL2-1/PM NAME MMarkley MOrenak DATE 02/16/2017 02/16/2017