CNL-16-174, Hydrologic Engineering Center River Analysis System (HEC-RAS) Project Milestone Status Update

Hydrologic Engineering Center River Analysis System (HEC-RAS) Project Milestone Status Update

ML16363A387
Person / Time
Site:	Browns Ferry, Watts Bar, Sequoyah
Issue date:	12/27/2016
From:	James Shea Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CNL-16-174
Download: ML16363A387 (3)

Text

Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402 CNL-16-174 December 27, 2016 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Renewed Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296 Sequoyah Nuclear Plant, Units 1 and 2 Renewed Facility Operating License Nos. DPR-77 and DPR-79 NRC Docket Nos. 50-327 and 50-328 Watts Bar Nuclear Plant, Units 1 and 2 Facility Operating License Nos. NPF-90 and NPF-96 NRC Docket Nos. 50-390 and 50-391

Subject:

TENNESSEE VALLEY AUTHORITY - HYDROLOGIC ENGINEERING CENTER RIVER ANALYSIS SYSTEM (HEC-RAS) PROJECT MILESTONE STATUS UPDATE

Reference:

TVA letter to NRC, Tennessee Valley Authority - Hydrologic Engineering Center River Analysis System (HEC-RAS) Project Milestones, dated June 22, 2016 (ML16175A518)

By letter dated June 22, 2016, Tennessee Valley Authority (TVA) provided NRC with dates for several project deliverables associated with the ongoing HEC-RAS external flood modeling project (referenced letter). The HEC-RAS external flood modeling project was the subject of an April 4, 2016 public meeting to discuss technical details and a resolution plan for TVAs HEC-RAS external flood modelling issues. In the referenced letter, TVA committed to provide updates on the status of the specific project deliverables on a six-month frequency.

U.S. Nuclear Regulatory Commission CNL-16-174 Page 2 December 27, 2016 The purpose of this letter is to provide the first written update regarding the status of the project milestones consistent with the commitment made in the referenced letter.

The status of Table 1 tasks from June 22, 2016 to date is provided below.

Tasks 1, 2, and 3, Mitigating Strategies Assessments (MSAs) for Browns Ferry, Sequoyah, and Watts Bar, respectively, were completed and submitted for Browns Ferry, Sequoyah, and Watts Bar by letters dated December 27, 2016, December 27, 2016, and December 27, 2016, respectively.

TABLE 1 PROJECT DELIVERABLE SUBMITTAL MILESTONES (Updates Shown in Bold Text)

Submittal Project Deliverable Milestone 1 Browns Ferry Mitigating Strategies Assessment (MSA) Complete 2 Sequoyah MSA Complete 3 Watts Bar MSA Complete 4 Watts Bar Focused Evaluation (FE)

• December 2017

• 5 Sequoyah FE

• December 2017

• 6 Browns Ferry FE

• December 2017

• 7 Sequoyah Hydrology License Amendment Request (LAR) April 2018 8 Watts Bar Hydrology LAR May 2018

• It is TVAs plan to perform Focused Evaluations for each site in lieu of Integrated Assessments. These deliverables and dates represent revised commitments from those made in the letters dated March 12, 2015, which transmitted the Browns Ferry, Sequoyah, and Watts Bar Flood Hazard Reevaluation Reports (ML15072A130, ML15071A462, and ML15071A262), respectively. Formal revision of these commitments will be the subject of separate correspondence after the revised guidance for performing integrated assessments and more focused evaluations are issued.

U.S . Nuclear Regulatory Commission CNL-16-174 Page 3 December 27, 2016 TVA will provide the second status update on these project deliverable submittal milestones by June 30 , 2017, consistent with the Commitment made in the referenced letter.

There are no new regulatory commitments contained in this letter.

If additional information is needed regarding this update, please contact Russell Thompson at (423) 751-2567.

cc:

NRR Director - NRC Headquarters NRR JLD Director - NRC Headquarters NRC Regional Administrator - Region II NRC Project Manager - Browns Ferry Nuclear Plant NRC Project Manager - Sequoyah Nuclear Plant NRC Project Manager - Watts Bar Nuclear Plant NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Senior Resident Inspector - Sequoyah Nuclear Plant NRC Senior Resident Inspector - Watts Bar Nuclear Plant