CNL-16-027, Response to Request for Additional Information Regarding Request for Relief ISPT-02
| ML16060A438 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar  (NPF-096) |
| Issue date: | 02/29/2016 |
| From: | James Shea Tennessee Valley Authority |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| CAC MF7038, CNL-16-027 | |
| Download: ML16060A438 (3) | |
Text
Tennessee Valley Authority,1101 Market Street, Chattanooga, Tennessee 37402 CNL-16-027 February 29, 2016 10 CFR 50.4 10 CFR 50.55a ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Watts Bar Nuclear Plant, Unit 2 Facility Operating License No. NPF-96 NRC Docket No. 50-391
Subject:
Watts Bar Nuclear Plant Unit 2 - Response to Request for Additional Information Regarding Request for Relief ISPT-02 (CAC No. MF7038)
Reference:
- 1. TVA Letter to NRC, CNL-15-057, Watts Bar Nuclear Plant Unit 2 - Request for Relief for Reactor Pressure Vessel Flange Seal Leak-Off Piping, dated October 30, 2015 (ML15303A546)
- 2. NRC Electronic Mail to TVA, Watts Bar Unit 2 Request for Additional Information on Relief Request ISPT-02 (CAC No. MF7038), dated February 1, 2016 On October 30, 2015, Tennessee Valley Authority (TVA) submitted a request for relief, ISPT-02, to the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code,Section XI, Rules for Inservice Inspection of Nuclear Power Plant Components, for the Watts Bar Nuclear Plant (WBN), Unit 2 for nominal pipe size (NPS) 1, 3/4, and 3/8 inch reactor pressure vessel (RPV) flange seal leak-off piping (Reference 1). On February 1, 2016, the Nuclear Regulatory Commission (NRC) provided a Request for Additional Information (RAI) regarding TVAs relief request ISPT-02 (Reference 2) and requested a response by March 2, 2016.
The enclosure to this letter provides TVAs response to the RAI.
U.S. Nuclear Regulatory Commission CNL-16-027 Page 2 February 29, 2016 There are no regulatory commitments associated with this submittal. Please address any questions regarding this response to Mr. Gordon Arent at 423-365-2004.
Respectfully, J. W. Shea Vice President, Nuclear Licensing
Enclosure:
Response to Request for Additional Information Regarding Relief Request ISPT-02 cc (Enclosure):
NRC Regional Administrator - Region II NRC Senior Resident Inspector - Watts Bar Nuclear Plant NRR Project Manager - Watts Bar Nuclear Plant J. W. Shea Digitally signed by J. W. Shea DN: cn=J. W. Shea, o=Tennessee Valley Authority, ou=Nuclear Licensing, email=jwshea@tva.gov, c=US Date: 2016.02.29 15:36:01 -05'00'
E-1 of 1 ENCLOSURE RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION REGARDING RELIEF REQUEST ISPT-02 TENNESSEE VALLEY AUTHORITY WATTS BAR NUCLEAR PLANT UNIT 2 DOCKET NO. 50-391 By letter dated October 30, 2015, Agencywide Documents Access and Management System (ADAMS) Accession No. ML15303A546 Cost Activity Code (CAC) Number MF7038, Tennessee Valley Authority (TVA), the licensee, requested approval of alternative testing associated with the inservice inspection (ISI) program first 10-year interval for Watts Bar Nuclear Plant (WBN) Unit 2. The Nuclear Regulatory Commission (NRC) staff is reviewing the submittal and has the following question:
Request ISPT-02:
- 1) What is the proposed test pressure (i.e., the numerical value of the static head pressure developed from the water level above the reactor pressure vessel flange when the reactor cavity is flooded) for the proposed system leakage testing of the subject leak-off piping?
TVA Response:
The taps in the vessel flange are located at elevation 723 feet 6-5/8 inches. Normal water level for refueling operations is between elevation 749 feet 1-1/2 inches to 749 feet 6-1/2 inches per plant operating procedures 2-GO-7, Refueling Operations, and 2-GO-10, Reactor Coolant System Drain and Fill Operations. This provides a static head of about 25.5 feet or a proposed test pressure of 11 pounds per square inch gauge.