ML21028A390

Request for Additional Information - North Anna Subsequent License Renewal Application Environmental Review (EPID Number: L-2020-SLE-0000) (Docket: 50-338 and 50-339)

ML21028A390
Person / Time
Site:	North Anna
Issue date:	01/29/2021
From:	Robert Elliott NRC/NMSS/DREFS/ELRB
To:	Stoddard D Virginia Electric & Power Co (VEPCO)
Tam Tran
References
EPID: L-2020-SLE-0000
Download: ML21028A390 (8)

Text

January 29, 2021 Mr. Daniel G. Stoddard Senior Vice President and Chief Nuclear Officer Innsbrook Technical Center 5000 Dominion Blvd Glen Allen, VA 23060

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - NORTH ANNA SUBSEQUENT LICENSE RENEWAL APPLICATION ENVIRONMENTAL REVIEW (EPID NUMBER: L-2020-SLE-0000) (DOCKET NUMBER: 50-338 AND 50-339)

Dear Mr. Stoddard:

By letters dated August 24, 2020 (Agencywide Documents Access and Management System Accession No. ML20246G703), Dominion Energy submitted an application for subsequent license renewal of Renewed Facility Operating License Nos. NPF-4 and NPF-7 for the North Anna Power Station, Unit Nos. 1 and 2 to the U.S. Nuclear Regulatory Commission (NRC) pursuant to Section 103 of the Atomic Energy Act of 1954, as amended, and Part 54 of Title 10 of the Code of Federal Regulations, Requirements for renewal of operating licenses for nuclear power plants.

The NRC staff is reviewing the information contained in the subsequent license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review.

This request for additional information was discussed with Mr. Keith Miller of your staff on January 26, 2021, and a date for the response is no later than 30 days from the date of this letter.

D.G. Stoddard 2 If you have any questions, please contact Mr. Tam Tran via e-mail at Tam.Tran@nrc.gov.

Sincerely, Digitally signed by Robert B.

Robert B. Elliott Elliott Date: 2021.01.29 14:32:58 -05'00' Robert B. Elliott, Branch Chief Division of Rulemaking, Environmental, and Financial Support Office of Nuclear Material Safety and Safeguards Docket Nos. 50-338 and 50-339

Enclosure:

As stated cc w/encl: Listserv

REQUEST FOR ADDITIONAL INFORMATION OFFICE OF NUCLEAR REACTOR REGULATION Issue Date: 01/29/2021 North Anna Power Station Subsequent License Renewal Virginia Electric & Power Co.

Dockets: 05000338-PWR-North Anna 1,05000339-PWR-North Anna 2 EPIDS: L-2020-SLE-0000 Questions Question Number: 127 Cumulative Impact Requirement 10 CFR 51.53(C)(3)(II)(O) requires that applicants provide information about other past, present, and reasonably foreseeable future actions occurring in the vicinity of the nuclear plant that may result in a cumulative effect.

Table B-1 of 10 CFR Part 51, Appendix B to Subpart ACumulative Impacts, requires that the NRC staff evaluate the cumulative impacts of continued operations or refurbishment associated with license renewal in conjunction with regional resource characteristics, the resource-specific impacts of license renewal, and the cumulative significance of other factors affecting the resource.

Section 4.12 of NUREG-1555, Supplement 1, Revision 1, Standard Review Plans for Environmental Reviews for Nuclear Power Plants: Operating License Renewal, directs the staff to "identify and calculate the likely cumulative environmental impacts for the area(s) or region(s) currently or likely to be affected by power plant operations and/or refurbishment activities associated with license renewal."

Issue An environmental audit breakout session was held on 12/2/2020 to address the NRC staff's information need CI-1, which requested the name, description, location, and status of any additional past, present, or reasonably foreseeable projects or actions that have been identified since the Environmental Report (ER) was prepared. Dominion Energy staff identified three new proposed projects at NAPS that were in addition to those previously addressed in Section E4.12.2 of the ER: 1) replacement of the NAPS Wastewater Treatment Plant, 2) installation of osprey nest platforms, and 3) construction of the Cyber Security Testing Facility. The NRC staff requires the information posted to the North Anna portal and discussed during the breakout session to be docketed in order to assess the potential cumulative impact of these projects.

Enclosure

2 Request Provide a summary of the environmental audit discussion held on 12/2/2020 addressing the narrative response to CI-1 and the supporting information posted by Dominion on the North Anna portal. Summary should include the name, description, location, and status of any additional past, present, or reasonably foreseeable projects or actions that have been identified since the ER was prepared. This should include the proposed NAPS Wastewater Treatment Plant replacement, Osprey Nest Platform installation, and Cyber Security Testing Facility construction.

3 Questions Question Number: 126 Aquatic Requirement Table B-1 of 10 CFR Part 51, Appendix B to Subpart AEnvironmental Effect of Renewing the Operating License of a Nuclear Power Plant requires that the U.S.

Nuclear Regulatory Commission (NRC) staff evaluate whether microbiological hazards to the public (plants with cooling ponds or canals or cooling towers that discharge to a river) will result in SMALL, MODERATE, or LARGE impacts during nuclear power plant license renewal.

Section 4.8.1 of NUREG-1555, Supplement 1, Revision 1, Standard Review Plans for Environmental Reviews for Nuclear Power Plants: Operating License Renewal, directs the staff to evaluate as part of its review of the issue of microbiological hazards to the public any "available data concerning the occurrence and concentrations of any of the deleterious thermophilic microorganisms listed above in the vicinity of the plant and a determination of whether any of them are present under conditions and in locations that might be harmful to members of the public."

Issue Sections E3.10.1 and E4.9.1 of the North Anna Environmental Report (ER) (ADAMS Accession No. ML20246G698) describe harmful algal blooms caused by elevated levels of cyanobacteria in Lake Anna in 2018. In order to fully assess the issue of whether these blooms constitute a microbiological hazard to the public and to support the staff's finding of SMALL, MODERATE, or LARGE for this issue, the NRC staff requires updated information on this issue (i.e., 2019-present) and further information on Dominion Energy Virginia's (Dominion) monitoring and mitigation efforts that minimize or mitigate health risks to the public.

Request Please answer the following questions concerning harmful algal blooms in Lake Anna.

1. Is Dominion aware of any harmful algal blooms in Lake Anna (either Lake Anna Reservoir or the Waste Heat Treatment Facility (WHTF)) prior to 2018? If so, please describe the location and duration of the blooms.

2. Has Dominion observed any harmful algal blooms in the WHTF since 2018? If so, please describe the location and duration of these blooms and any steps Dominion took to monitor or mitigate the blooms. Provide both a narrative description and a diagram or map, if available.

4

3. For each of the harmful algal blooms that Dominion has documented in the WHTF (2018-present), please specify what members of the public were able to access the affected waters (i.e., all members of the public, only adjacent private landowners, no members of the public if the blooms were within the plant protected area, etc.).

4. The ER (p. E-3-127) states that Dominion "issued no-swimming advisories for four WHTF areas" in 2018. For what four areas of the WHTF were these no-swim advisories made? Provide both a narrative description and a diagram or map, if available.

5. Where can the public access Dominion's no-swim advisories? Please provide any of the following, if relevant: publicly available webpage address, printed notices, and locations of physically posted advisory signs at Lake Anna.

6. During the proposed license renewal term, does Dominion anticipate continuing to monitor cyanobacteria according to its 2018 plan, issuing related no-swim advisories to the public, and generally coordinating with the Virginia Department of Health (VDH) regarding harmful algal blooms?

5 Questions Question Number: 140 Electric Shock In Sections E3.10.2, Electrical Shock Hazards, and E4.9.2.4, Analysis, of the North Anna Power Station Units 1 and 2 Subsequent License Renewal Environmental Report (ER), Dominion states "Concerning the aboveground in-scope transmission lines, a 2018 investigation by Dominion confirmed that the steady-state discharging current in a worst-case scenario would be less than NESC standard of 5 mA rms." However, a reference citation to this report is not provided in the ER like was done for shock hazard avoidance by providing two Dominion electrical safety documents as references.

To provide clarity as to the analysis Dominion relied upon for demonstrating compliance with National Electrical Safety Code (NESC) standard of 5 mA rms, the staff requests that Dominion provide a reference citation to the above 2018 investigation as was provided for ER references Dominion 2017c and Dominion 2017d shown on ER page E-10-4. Also, please provide information on the version of NESC containing the NESC standard of 5 mA rms that was applied in the 2018 investigation.

ML21028A390 *concurrence via email DD:NRR:DNRL (RAI) BC:NMSS:REFS OFFICE PM:NMSS:REFS LA:NMSS:REFS OGC (aquatic RAI)

NAME *TTran *AWalker-Smith *ABradford *AGhosh *RElliott DATE 01/25/2021 01/28/2021 01/26/2021 01/26/2021 01/29/2021