NMP1L3304, Supplemental Information No. 2 to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration

Supplemental Information No. 2 to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration

ML19211C702
Person / Time
Site:	Nine Mile Point
Issue date:	07/30/2019
From:	Jim Barstow Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NMP1L3304
Download: ML19211C702 (5)

Text

Exelon Generation ~.

200 Exelon Way Kennett Square. PA 19348 www.exeloncorp.com 10 CFR 50.90 NMP1L3304 July 30, 2019 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555-0001 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 NRG Docket No. 50-220

Subject:

Supplemental Information No. 2 to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration

References:

1. Letter from J. Barstow (Exelon Generation Company, LLC) to U.S. Nuclear Regulatory Commission, "License Amendment Request-Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration,"

dated June 26, 2018

2. Email from M. Marshall (Senior Project Manager, U.S. Nuclear Regulatory Commission) to R. Reynolds (Exelon Generation Company, LLC), "Nine Mile Point, Unit 1-Request for Additional Information Regarding Primary Containment Oxygen Concentration License Amendment Request (L-2018-LLA-0183)," dated January 25, 2019

3. Letter from J. Barstow (Exelon Generation Company, LLC) to U.S. Nuclear Regulatory Commission, "Response to Request for Additional Information by the Office of Nuclear Reactor Regulation to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration," dated February 25, 2019

4. Public Meeting Notice for April 18, 2019, "Meeting Between NRG and Exelon Generation Company, LLC (Exelon) Concerning the Nine Mile Point Nuclear Station, Unit 1, Oxygen Concentration License Amendment Request," dated April 5, 2019

U.S. Nuclear Regulatory Commission Supplemental Information Primary Containment Oxygen Concentration Docket No. 50-220 July 30, 2019 Page2

5. Letter from J. Barstow (Exelon Generation Company, LLC) to U.S. Nuclear Regulatory Commission, "Supplemental Information to Support Review of Nine Mile Point Nuclear Station, Unit 1, License Amendment Request to Revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration," dated March 17, 2019 By letter dated June 26, 2018 (Reference 1), Exelon Generation Company, LLC (Exelon) requested a change to the Nine Mile Point Unit 1 (NMP1) Technical Specifications (TS). The proposed License Amendment Request (LAR) is to revise Technical Specifications 3.3.1 for Primary Containment Oxygen Concentration.

On January 25, 2019 (Reference 2), the U.S. Nuclear Regulatory Commission (NRC) identified areas where additional information was necessary to complete the review.

On February 25, 2019 (Reference 3), Exelon submitted responses to the NRC's request for additional information.

A public meeting was held on April 18, 2019 (Reference 4), where the NRC staff and representatives of Exelon discussed Exelon's responses to the NRC's request for additional information concerning the Nine Mile Point Nuclear Station, Unit 1, oxygen concentration LAR. An additional public meeting was held on May 9, 2019 to present the planned submittal information to ensure all NRC questions were appropriately addressed.

On March 17, 2019 (Reference 5), Exelon submitted Supplemental Information to support the NRCs review of the LAR. Attachment 2 to that letter provided the revised marked-up TS and Bases pages, replacing the previously submitted marked-up TS and Bases pages and associated inserts submitted with References 1 and 3. to this letter contains revised TS page 124 that is being resubmitted to correct an oversight. Specifically, the exception in TS 3.3.1 a should refer to TS 3.3.1 b only (rather than TS 3.3.1 b and TS 3.3.1 c). This revised TS page supersedes the markup TS page 124 provided in Reference 5.

Exelon has reviewed the information supporting a finding of no significant hazards consideration and the environmental consideration provided to the NRC in Reference 1. The supplemental information provided in this letter does not affect the bases for concluding that the proposed license amendment does not involve a significant hazards consideration.

Furthermore, the supplemental information provided in this letter does not affect the bases for concluding that neither an environmental impact statement nor an environmental assessment needs to be prepared in connection with the proposed amendment.

There are no commitments contained in this response.

If you should have any questions regarding this submittal, please contact Ron Reynolds at 610-765-5247.

U.S. Nuclear Regulatory Commission Supplemental Information Primary Containment Oxygen Concentration Docket No. 50-220 July 30, 2019 Page 3 I declare under penalty of perjury that the foregoing is true and correct. Executed on the 3Q1h day of July 2019.

Respectfully, a~flk-James Barstow Director, Licensing Exelon Generation Company, LLC : Revised Markup Page (TS Page 124) cc: USNRC Region I Regional Administrator w/attachments USN RC Senior Resident Inspector - NMP USNRC Project Manager, NRR - NMP A. L. Peterson, NYSERDA

ATTACHMENT 1 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 NRC Docket No. 50-220 Revised Markup Page TS Marked-up Page 124

LIMITING CONDITION FOR OPERATION SURVEILLANCE REQUIREMENT 3.3.1 OXYGEN CONCENTRATION 43.1 OXYGEN CONCENTRATION Apollcabllitv: Aopllcability:

Applies to the limit on oxygen concentration within Applies to the periodic testing requirement for the the primary containment system. ~i-n- _p_o_w_e_r...___

th_e ___, primary containment system oxygen concentration.

Obiectlve: operating condition Ob!ective:

To assure that in the event or a loss-of-coolant To assure that the oxygen concentration within the accident any hydrogen generation will not result in a primary containment system is within required limits.

combustible mixture within the primary containment system.

Specification: Specification:

a. The primary containment atmosphere shall be In accordance with the Surveillance Frequency reduced to less than four percent by volume Control Program, oxygen concentration shall be oxygen concentration with nitrogen gas determined.

while in the power operating condition Delete 'and "c"' per AMENDMENT NO.~. 222 Supplement 2 124