NOC-AE-19003673, Response to Request for Additional Information for South Texas Project (STP) Units 1 & 2 License Amendment Request to Revise Technical Specification 3.8.1.1 (A.C. Sources, Operating) (L-2018-LLA-0078

Response to Request for Additional Information for South Texas Project (STP) Units 1 & 2 License Amendment Request to Revise Technical Specification 3.8.1.1 (A.C. Sources, Operating) (L-2018-LLA-0078

ML19176A570
Person / Time
Site:	South Texas
Issue date:	06/25/2019
From:	Connolly J South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
EPID L-2018-LLA-0078, NOC-AE-19003673, STI: 34868421
Download: ML19176A570 (5)

Text

South Texas Project Electric Generating Station P.Q Box 289 Wadsworth, TeKas 77481 -----------V\1\/'v--

June 25, 2019 NOC-AE-19003673 10 CFR 50.90 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Response to Request for Additional Information for South Texas Project (STP) Units 1 & 2 License Amendment Request to Revise Technical Specification 3.8.1.1 (A.C. Sources, Operating) (L-2018-LLA-0078)

References:

1. Letter; J. Connolly to USNRC Document Control Desk; "License Amendment Request to Revise Technical Specification 3.8.1.1 (A.C. Sources, Operating)"; March 27, 2018; (NOC-AE-17003529) (ML180868761).

2. E-mail; L. Regner (NRC) to D. Richards (STP); "Final RAI - South Texas Standby DG TS change (L-2018-LLA-0078)"; October 10, 2018; (AE-NOC-18003142) (ML182838952).

3. Letter; J. Connolly to USNRC Document Control Desk; "Response to Request for Additional Information for South Texas Project (STP) Units 1 & 2 License Amendment Request to Revise Technical Specification 3.8.1.1 (A.C. Sources, Operating) (L-2018-LLA-0078)";

December 6, 2018; (NOC-AE-18003602) (ML18340A206).

4. E-mail; L. Regner to D. Richards; "DRAFT Round 2 RAI - SBDG Voltage and Frequency LAR (L-2018-LLA-0078)"; March 21, 2019; (AE-NOC-19003170) (ML19081A151).

5. Letter; M. Schaefer to USNRC Document Control Desk; "Supplement to South Texas Project (STP) Units 1 & 2 License Amendment Request to Revise Tech_nical Specification 3.8.1.1 (A.C. Sources, Operating) (L.;.2018-LLA-0078)"; May 16, 2019; (NOC-AE-19003637)

(ML19136A408).

6. E-mail; E. Miller (NRC) to D. Richards (STP); "Draft RAI for STP TS 3.8.1.1 SBDG SR Change"; June 14, 2019; (ML19165A103).

By Reference 1, STP Nuclear Operating Company (STPNOC) requested approval of a license amendment to Technical Specification 3.8.1.1 to revise certain minimum voltage and frequency acceptance criteria for steady-state standby diesel generator surveillance testing. By References 2 and 4, the NRC staff sent requests for additional information (RAls) to complete its review. STPNOC responsed to these RAls by References 3 and 5, respectively. By Reference 6, the NRC staff sent an additional RAI. The STPNOC response to this RAI is provided in the Enclosure to this letter.

STI: 34868421

NOC-AE-19003673 Page 2 of 3 There are no commitments in this letter.

If there are any questions or if additional information is needed, please contact Wendy Brost at (361) 972-8516 or me at (361) 972-7344.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on Ji{n ^ ^6

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imes W. Connolly (

Executive Vice President &

Chief Nuclear Officer web/JWC

Enclosure:

Response to Request for Additional Information

NOC-AE-19003673 Page 3 of 3 ec:

Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 1600 E. Lamar Boulevard Arlington, TX 76011-4511 Ed Miller Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (09E01) 11555RockvillePike Rockville, MD 20852

Enclosure NOC-AE-19003673 ENCLOSURE Response to Request for Additional Information

Enclosure NOC-AE-19003673 Page 1 of 1 STP NUCLEAR OPERATING COMPANY SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION UNITS 1 AND 2 DOCKET NUMBERS 50-498 AND 50-499 REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST TO REVISE TECHNICAL SPECIFICATION 3.8.1.1 (A.C. SOURCES, OPERATING)

In the submittal dated March 27, 2018, information is provided regarding the frequency results of selected EDG surveillance runs. In the supplement dated December 6, 2018 voltage results are provided for a different selection of EDG surveillance runs. Please confirm that for all fast-start surveillance runs in the last 3 years in which measurements were taken by digital recorders, the results demonstrated that the EDGs frequency and voltage were within the limits proposed in TS SR 4.8.1.1.2.5. For any instances where the parameters were not within TS limits, please provide a discussion with a focus on how the STI remains appropriate given the failure to meet the proposed parameters.

STP N OC response STPNOC has confirmed that the voltage and frequency measurements for all fast-start standby diesel generator (SBDG) surveillance runs in the past three years were within the limits proposed in Technical Specification Surveillance Requirement 4.8.1.1.2.5.