ML14203A050

Supplement to Nine Mile Point Nuclear Station License Amendment Request for Diesel Generator Initiation - Degraded Voltage Time Delay Setting Change for Final Degraded Voltage Study

ML14203A050
Person / Time
Site:	Nine Mile Point
Issue date:	07/08/2014
From:	Costanzo C Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML14203A050 (2)

Text

A EWChris Costanzo ExelNon Ex nGeneration.

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Site Vice President - Nine Mile Point ChriBos6 Lycoming, NY 13093 315-349-5200 Office www.exeloncorp.com Chdstopher.costanzo@exeloncorp.com July 8, 2014 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License No. DPR-63 Docket No. 50-220

Subject:

Supplement to Nine Mile Point Nuclear Station License Amendment Request for Diesel Generator Initiation - Degraded Voltage Time Delay Setting Change for Final Degraded Voltage Study

References:

(1) Letter from C. Costanzo (NMPNS) to Document Control Desk (USNRC), License Amendment Request Pursuant to 10 CFR 50.90:

Diesel Generator Initiation - Degraded Voltage Time Delay Setting Change, dated March 8, 2013 (ADAMS Accession No. ML13073A103)

(2) Letter from C. Costanzo (NMPNS) to Document Control Desk (USNRC), Supplement to Nine Mile Point Nuclear Station License Amendment Request for Diesel Generator Initiation - Degraded Voltage Time Delay Setting Change, dated May 16, 2013 (ADAMS Accession No. ML13144A068)

Nine Mile Point Nuclear Station, LLC (NMPNS) hereby submits a supplement to the Nine Mile Point Unit 1 (NMP1) License Amendment Request for Diesel Generator Initiation -

Degraded Voltage Time Delay Setting Change, Reference (1), to confirm the results of the preliminary study submitted to the NRC staff in Reference (2).

The preliminary degraded voltage study submitted in Reference (2) has been finalized and accepted by NMPNS as a formal calculation. The final study refined the preliminary study results with improved margin obtained. There are no changes to the original Attachment 1 provided in Reference (2).

The final study results did change the conclusions in the original Attachment 2 provided in Reference (2). The Inputs and Assumptions provided in the original Attachment 2 remained valid and are included in the results of the calculation. The final conclusion determined the 550 volt and 575 volt equipment are above the degraded voltage threshold values defined in the original Attachment 2. The equipment listed in the original Tables 4 and 5 have been removed as there are no exceptions.

U. S. Nuclear Regulatory Commission July 8, 2014 Page 2 Table 6 has been updated and is provided below. This Table 6 replaces the Table 6 previously submitted with Reference (2).

Table 6: Motor Terminal Voltage During Start (Voltages in % of Motor Rated)

Volts at start Motor Motor(kV)

Rated V Start Time (Sec) time (% of Rated) Bus RFPAOP 51-165 0.575 1.00 80.825 1671C This supplemental letter does not change the initial determination of "no significant hazards consideration" justified in the original amendment request, Reference (1).

Pursuant to 10 CFR 50.91(b)(1), NMPNS has provided a copy of this supplemental information to the appropriate state representative.

This letter contains no new regulatory commitments.

Should you have any questions regarding the information in this submittal, please contact Everett (Chip) Perkins, Director Licensing, at (315) 349-5219.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 8 th day of July, 2014.

Christopher R. Costanzo CRC/KJK cc: Regional Administrator, Region I, USNRC Project Manager, USNRC Resident Inspector, USNRC A. L. Peterson, NYSERDA