ML14210A021
| ML14210A021 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Surry  |
| Issue date: | 08/08/2014 |
| From: | Michael Balazik Japan Lessons-Learned Division |
| To: | |
| Balazik M, NRR/JLD, 415-2856 | |
| References | |
| Download: ML14210A021 (5) | |
Text
LICENSEE: Dominion Nuclear Virginia Electric and Power Company FACILITIES: Millstone Power Station, Unit 2 Surry Power Station, Unit Nos. 1 and 2
SUBJECT:
SUMMARY
OF THE JUNE 25, 2014, CATEGORY 1 PUBLIC MEETING WITH DOMINION NUCLEAR AND VIRGINIA ELECTRIC AND POWER COMPANY TO DISCUSS SEISMIC HAZARD REEVALUATIONS ASSOCIATED WITH IMPLEMENTATION OF JAPAN LESSONS-LEARNED NEAR-TERM TASK FORCE RECOMMENDATION 2.1.
On June 25, 2014, the U.S. Nuclear Regulatory Commission (NRC or the staff) held a Category 1 public meeting 1 with Dominion Nuclear (the licensee) for Millstone Power Station (Millstone),
Unit 2 and Virginia Electric and Power Company (the licensee, Dominion) for Surry Power Station (Surry), Unit Nos. 1 and 2. The purpose of this meeting was to discuss issues resulting from the staff's screening and prioritization of Surry related to Enclosure 1, Recommendation 2.1: Seismic of the March 12, 2012, NRC request for information per Title 10 to the Code of Federal Regulations, Part 50, Section 50.54(f) lette~ (hereafter referred to as the 50.54(f) letter.
By letter dated May 9, 2014, 3 the NRC staff categorized Surry, Units 1 and 2, as a "conditional screen in", prioritization group 3 plant with a risk evaluation due by December 31, 2020 based on the staff's screening review. By memo dated May 21, 2014, the NRC staff documented their preliminary Ground Motion Response Spectra (GMRS) curve in comparison to all licensee GMRS curves along with the plant's Safe Shutdown Earthquake (SSE) and Individual Plant Examination of External Events (IPEEE) High Confidence Low Probability of Failure (HCLPF)
Spectra, also known as the IHS (IPEEE HCLPF Spectra). The public meeting supported an information exchange and understanding of engineering differences to achieve subsequent technical resolution.
To facilitate the discussion, the NRC staff and Dominion representatives presented 4 the engineering details on the modeling inputs used to develop GMRS curves for Surry. The meeting highlights included:
- Discussion on using co-located independent spent fuel storage installation (ISFSI) soil velocity measurements versus correlations used based on in-situ examination of materials from foundation boring samples
- Minor differences in damping/kappa 1
The original meeting notice is available via the Agencywide Documents Access and Management System (ADAMS) under Accession No. ML14168A027.
2 The 50.54(f) letter and Enclosure 1 are available under ADAMS Accession Nos. ML12053A340 and ML12056A047.
3 The May 9, 20141etter is available under ADAMS Accession No. ML14111A147.
4 The NRC and Dominion slides can be found under ADAMS Accession Nos. ML141758500 and ML14176A092.
In summary, the NRC staff stated that the primary differences between the NRC staff and licensee GMRS curves appear to result from:
- GMRS modeling differences are primarily influenced by the first 500 ft. of the soil profile
- Differences in velocity profiles The NRC staff and Dominion also discussed the IPEEE adequacy used for seismic screening of Millstone, Unit 2. The IPEEE discussion included the evaluation of the following components:
- Battery Racks DB 1/DB2
- Chilled Water Surge Tank
- Valve 2-CHW-11 Finally, the NRC stated that a follow up request for additional information may be issued to document the licensee's technical basis and background information as well as any other clarifications associated with the information presented at the meeting.
No regulatory decisions or commitments were made during the meeting. The public was invited to observe the meeting and was given several opportunities to communicate with the NRC during the public meeting and before adjourning. The NRC staff received no public comments and no meeting feedback forms.
Please direct any inquiries to me at 301-415-2856, or Michaei.Balazik@nrc.gov.
\f.
az1k, Pr Je ager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket Nos. 50-336, 50-280, and 50-281
Enclosure:
List of Attendees cc w/encl: Distribution via Listserv
List of Attendees U.S. Nuclear Regulatory Commission Public Meeting with Dominion Nuclear Concerning Seismic Hazard Reevaluation Submittals Japan Lessons-Learned Near-Term Task Force Recommendation 2.1: Seismic June 25, 2014 Name Organization Name Organization Jon Ake NRC/RES/DE Wanda Craft Dominion Cliff Munson NRC/NRO/DSEA John Anderson AEP Diane Jackson NRC/NRO/DSEA John Richards EPRI Nicholas DiFrancesco NRC/NRR/JLD Barry Graber Dominion Vladimir Graizer NRC/NRO/DSEA Doug Lawrence Dominion Michael Balazik NRC/NRR/JLD Gary Miller Dominion Brittain Hill NRC/NRO/DSEA Justin Huber TVA Juan Uribe NRC/NRR/JLD Daniel Vasquez Dominion David Ma Argonne National Lab Donnie Harrison NRC/NRO/DSRA Walt Silva Pacific Engineering NRC/RII/SRI Nick Gregor Philip McKenna Surry Bechtel Jared Nadel NRC/RII/RI Surry James Petrosky Dominion Thomas John Dominion David MacNeill Dominion Roger Gish TVA Ronald Wittschen Southern Nuclear Co.
Robin McGuire Lettis Consultants Andrew Mauer NEI International Malcolm Hargraves Dominion Paul Guill Duke Energy Divakar Bhargava Dominion Brenda Kovarik, AEP Marc Hotchkiss Dominion (continues to next page)
Abbrev1at1ons:
AEP - American Electric Power DE - Division of Engineering DSEA - Division of Site Safety and Environmental Analysis DSRA - Division of Safety Systems & Risk Assessment EPRI - Electric Power Research Institute JLD - Japan Lessons-Learned Division NEI -Nuclear Energy Institute NRO - Office of New Reactors NRR - Office of Nuclear Reactor Regulation RES - Office of Nuclear Regulatory Research TVA- Tennessee Valley Authority Enclosure
Name Organization Name Organization Scott Lappegaard Xcel Nuclear Behrooz Tavakoli Bechtel Nadja Joergensen Xcel Nuclear Richard Rohrer Xcel Nuclear Simpson, Gumpertz &
Greg Hardy Heger Dan Ludwig Xcel Nuclear Kimberly Keithline MPR Associates
ML14210A021 OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRR/JLD/JHMB/BC NRR/JLD/JHMB/PM NAME MBalazik Slent SWhaley MBalazik DATE 07/28/14 07/29/14 07/30/14 08/11/14