CNL-15-203, Response to Question Regarding GDC-5 Guidance for Dual Unit Shutdown

Response to Question Regarding GDC-5 Guidance for Dual Unit Shutdown

ML15265A100
Person / Time
Site:	Watts Bar
Issue date:	09/21/2015
From:	James Shea Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CNL-15-203
Download: ML15265A100 (3)

Text

Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-15-203 September 21 , 2015 10 CFR 50.90 U.S. Nuclear Regulatory Commission ATTN : Document Control Desk Washington , D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 1 Facility Operating License No. NFP-90 NRC Docket No. 50-390 Watts Bar Nuclear Plant, Unit 2 Construction Permit No. CPPR-92 NRC Docket No. 50-391

Subject:

Response to Question Regarding GDC-5 Guidance for Dual Unit Shutdown

Reference:

Letter from TVA to NRC , CNL-15-170, "Responses to NRC Audit Review Questions for Watts Bar Nuclear Plant Unit 1 Essential Raw Cooling Water and Component Cooling Water System License Amendment Request," dated August 28, 2015(ML15243A044)

By letter dated August 28, 2015 (Reference), Tennessee Valley Authority (TVA) submitted a response to Nuclear Regulatory Commission (NRC) questions pertaining to a license amendment request for Watts Bar Nuclear Plant (WBN) Unit 1 associated with the Emergency Raw Cooling Water and Component Cooling Water systems. In a teleconference on September 11, 2015, the NRC staff raised a question regarding the Reference submittal. The purpose of this letter is to respond to the NRC staff question from the September 11 , 2015 teleconference regarding dual unit shutdown .

To address the NRC staff question, the following caution statement will be added to certain TVA documents and procedures:

"CAUTION : Both Units shall not be placed in Hot Shutdown simultaneously."

Specifically, the caution statement will be added to the WBN System Description Document WBN-SSD-N3-70-4002 , "Component Cooling System, " and to the WBN General Operating Instructions 1-G0-6 and 2-G0-6, "Unit Shutdown from Hot Standby to Cold Shutdown ." The instructions will be revised prior to initial Mode 4 entry of WBN Unit 2.

U.S. Nuclear Regulatory Commission CNL-15-203 Page2 September 21 , 2015 The enclosure provides the commitments discussed in this letter. Please contact Gordon Arent at 423-365-2004 if there are any questions regarding this submittal.

I declare under penalty of perjury that the foregoing is true and correct. Executed on the 21st day of September 2015.

Respec~lly,

,<~

~ y ,c_

Vit*~resident, Nuclear Licensing

Enclosure:

List of Commitments cc (Enclosure):

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Watts Bar Nuclear Plant, Unit 1 NRC Senior Resident Inspector - Watts Bar Nuclear Plant, Unit 2 NRC Project Manager - Watts Bar Nuclear Plant, Unit 1 NRC Project Manager - Watts Bar Nuclear Plant, Unit 2

ENCLOSURE LIST OF COMMITMENTS

1. The caution statement, "CAUTION: Both Units shall not be placed in Hot Shutdown simultaneously," will be added to the Watts Bar Nuclear Plant (WBN) System Description Document WBN-SSD-N3-70-4002, "Component Cooling System," prior to initial Mode 4 entry of WBN Unit 2.

2. The caution statement, "CAUTION: Both Units shall not be placed in Hot Shutdown simultaneously," will be added to the WBN General Operating Instructions 1-G0-6 and 2-G0-6, "Unit Shutdown from Hot Standby to Cold Shutdown," prior to initial Mode 4 entry of WBN Unit 2.