CNL-19-105, Supplemental Response to Second-Round NRC Request for Additional Information Regarding Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2 (WBN-TS-18-09)

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Supplemental Response to Second-Round NRC Request for Additional Information Regarding Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2 (WBN-TS-18-09)
ML19283G172
Person / Time
Site: Watts Bar  Tennessee Valley Authority icon.png
Issue date: 10/10/2019
From: Polickoski J
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
CNL-19-105, EPID L-2018-LLA-0494, WBN-TS-18-09
Download: ML19283G172 (6)
v • d • e


Text

Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-19-105 October 10, 2019 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Units 1 and 2 Facility Operating Licenses No. NPF-90 and NPF-96 Docket Nos. 50-390 and 391

Subject:

Supplemental Response to Second-Round NRC Request for Additional Information Regarding Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2 (WBN-TS-18-09)

(EPID L-2018-LLA-0494)

References:

1. TVA letter to NRC, CNL-18-118, Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2, DC Electrical Rewrite - Update to TSTF -360 (WBN-TS-18-09), dated November 29, 2018 (ML18334A389)
2. NRC Electronic Mail to TVA, Watts Bar Nuclear Plant - Final Request for Additional Information Related to Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2 (EPID L-2018-LLA-0494) dated May 3, 2019 (ML19011A349)
3. TVA letter to NRC, CNL-19-056, Response to NRC Request for Additional Information Regarding Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2, DC Electrical Rewrite - Update to TSTF -360 (WBN-TS-18-09), dated June 7, 2019 (ML19158A394)
4. NRC electronic mail to TVA, Watts Bar Nuclear Plant - Second-Round Request for Additional Information Related to Application to Revise Technical Specifications Regarding DC Electrical Systems, TSTF-500, Revision 2 (EPID L-2018-LLA-0494), dated August 2, 2019 (ML19218A030)
5. TVA letter to NRC, CNL-19-062, Response to Second-Round NRC Request for Additional Information Regarding Application to Revise Technical Specifications Regarding DC Electrical Systems TSTF-500, Revision 2, DC lectrical Rewrite - Update to TSTF -360 (WBN-TS-18-09), dated September 4, 2019 (ML19247C981)

In Reference 1, TVA submitted a request for an amendment to the technical specifications (TS) for Watts Bar Nuclear Plant (WBN), Units 1 and 2. The proposed amendment revises TS requirements related to direct current (DC) electrical systems in accordance with Technical Specification Task Force (TSTF) Traveler TSTF-500, Revision 2, DC Electrical Rewrite -

Update to TSTF-360.

U.S. Nuclear Regulatory Commission CNL-19-105 Page 2 October 10, 2019 In Reference 2, the Nuclear Regulatory Commission (NRC) issued a Request for Additional Information (RAI). In Reference 3, TVA provided a response to the NRC RAI. In Reference 4, the NRC issued a second-round RAI. In Reference 5, TVA provided a response to the second-round RAI. However, the WBN Unit 1 TS 3.8.4, "DC Sources - Operating," markup provided in Reference 5 inadvertently omitted the removal of Lim iting Condition for Operation (LCO) 3.8.4 Note 2, as was provided in References 1 and 3. Therefore, Enclosure 1 provides a replacement markup of WBN Unit 1 TS page 3.8-24 to reflect the deletion of LCO 3.8.4 Note 2. Enclosure 2 provides a replacement (re-typed) WBN Unit 1 TS page 3.8-24. The revised TS 3.8.4 pages in Enclosures 1 and 2 supersede those provided in Reference 5.

The enclosures to this letter do not change the no significant hazard considerations nor the environmental considerations contained in Reference 1. Additionally, in accordance with 10 CFR 50.91 (b)(1 ), TVA is sending a copy of this letter and the enclosure to the Tennessee Department of Environment and Conservation.

There are no new regulatory commitments associated with this submittal. Please address any questions regarding this request to Kimberly D. Hulvey at (423) 751-3275.

I declare under penalty of perjury that the foregoing is true and correct. Executed on this 10th day of October 2019.

Respectfully,

\

J{ E.-;~ '

Director, Nuclear Regulatory Affairs

Enclosures:

1. WBN Unit 1 Technical Specifications 3.8.4, Page 3.8-24 Changes (Marked-up)
2. WBN Unit 1 Technical Specifications 3.8.4, Page 3.8-24 Changes (Re-typed) cc: (Enclosures)

NRC Regional Administrator - Region II NRC Project Manager - Watts Bar Nuclear Plant NRC Senior Resident Inspector - Watts Bar Nuclear Plant Director, Division of Radiological Health - Tennessee State Department of Environment and Conservation

Enclosure 1 WBN Unit 1 Technical Specifications 3.8.4, Page 3.8-24 Changes (Marked-up)

CNL-19-105 E1-1

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 Four channels of The Train A and Train B vital DC and four Diesel Generator (DG) DC electrical power subsystems shall be OPERABLE.

NOTES------------------------------------------------

1. Vital Battery V may be substituted for any of the required vital batteries.
2. The C-S DG and its associated DC electrical power subsystem may be substituted for any of the required DGs and their associated DC electrical power subsystem.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or two required vital A.1 Restore battery terminal 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> battery charger(s) on one voltage to greater than or subsystem inoperable. equal to the minimum established float voltage.

AND A.2 Verify battery float current Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 2 amps.

AND A.3 Restore vital battery charger(s) 7 days to OPERABLE status.

AB. One vital DC electrical AB.1 Restore vital DC electrical 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> power subsystem power subsystem to inoperable for reasons OPERABLE status.

other than Condition A.

BC. Required Action and BC.1 Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> Associated Completion Time of Condition A or B AND not met.

BC.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> (continued)

Watts Bar-Unit 1 3.8-24 Amendment XX

Enclosure 2 WBN Unit 1 Technical Specifications 3.8.4, Page 3.8-24 Changes (Re-typed)

CNL-19-105 E2-1

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 The Train A and Train B vital DC and Diesel Generator (DG) DC electrical power subsystems shall be OPERABLE.

NOTE------------------------------------------------

Vital Battery V may be substituted for any of the required vital batteries.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or two required vital A.1 Restore battery terminal 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> battery charger(s) on one voltage to greater than or subsystem inoperable. equal to the minimum established float voltage.

AND A.2 Verify battery float current Once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 2 amps.

AND A.3 Restore vital battery charger(s) 7 days to OPERABLE status.

B. One vital DC electrical B.1 Restore vital DC electrical 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> power subsystem power subsystem to inoperable for reasons OPERABLE status.

other than Condition A.

C. Required Action and C.1 Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> Associated Completion Time of Condition A or B AND not met.

C.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> (continued)

Watts Bar-Unit 1 3.8-24 Amendment XX

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