CNL-15-203, 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 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 10 CFR 50.90
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