View source for CNL-18-109, Sequoyah Nuclear Plant, Units 1 and 2 - Fourth Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses

{{Adams
| number = ML18239A129
| issue date = 08/24/2018
| title = Sequoyah Nuclear Plant, Units 1 and 2 - Fourth Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses
| author name = Henderson E K
| author affiliation = Tennessee Valley Authority
| addressee name = 
| addressee affiliation = NRC/Document Control Desk, NRC/NRR
| docket = 05000327, 05000328
| license number = DPR-077, DPR-078
| contact person = 
| case reference number = CNL-18-109
| document type = Letter type:CNL
| page count = 3
}}

=Text=
{{#Wiki_filter:Tennessee Valley Authority, 1101 Market Street, Chattanooga, Tennessee 37402

CNL-18-109 August 24, 2018 

10 CFR 50.4 

ATTN:  Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 

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 

==Subject:==
Sequoyah Nuclear Plant, Units 1 and 2 - Fourth Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses 

==References:==
: 1. TVA letter to NRC, "Sequoyah Nuclear Plant, Units 1 and 2 - Application to Modify Ice Condenser Technical Specifications to Address Revisions in Westinghouse Mass and Energy Release Calculation (SQN-TS-12-04),"
dated July 3, 2013 (ML13199A281) 
: 2. TVA letter to NRC, CNL-16-049, "Sequoyah Nuclear Plant, Units 1 and 2 - Withdrawal of Application to Modify Ice Condenser Technical Specifications to Address Revisions in Westinghouse Mass and Energy Release Calculation (SQN-TS-12-04)," dated September 19, 2016 (ML16264A456) 

3 TVA letter to NRC, CNL-17-041, "Sequoyah Nuclear Plant, Units 1 and 2 -
Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses," dated March 10, 2017 (ML17069A391) 
: 4. TVA letter to NRC, CNL-17-103, "Sequoyah Nuclear Plant, Units 1 and 2 - Second Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses," dated August 24, 2017 (ML17257A330) 
: 5. TVA letter to NRC, CNL-18-031, "Sequoyah Nuclear Plant, Units 1 and 2 - Third Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses," dated February 28, 2018 (ML1860A334) 

CNL-18-109 Page E1 of 1 Enclosure Periodic Schedule Update for Revision of Loss-of-Coolant Accident Mass and Energy Release Calculations Related to Containment Integrity Response Analyses The table below includes the milestones for the revised loss-of-coolant accident (LOCA) mass and energy release calculations and associated containment integrity response analyses utilizing the new Westinghouse WCOBRA/TRAC model. All milestones have been completed.
Phase 1 Target Milestones Schedule Date 1 Project Customer Kickoff June 2016 (Complete) 2 Input Request Letter to TVA August 2016 (Complete) 3 TVA issuance of analytical input summary (AIS) September 2016 (Complete) 4 Completion of WCOBRA/TRAC Model July 2017 (Complete) 5 Issuance of preliminary containment response results November 2017 (Complete) 6 TVA issuance of Phase 2 guidance on margin allocation February 2018 (Complete)
Phase 2 Target Milestones Schedule Date 7 Issuance of draft LOCA M&E and Containment Integrity analysis report March 2018 (Complete) 8 TVA reviews the draft Containment Integrity analysis report and provides owners review comments April 2018 (Complete) 9 Issuance of final Containment analysis report plus FSAR, Accident Analysis Parameter Checklist, Technical Specification markups (if necessary) 1 June 2018 (Complete) 2                                                   1. As noted in the cover letter, TVA determined that no changes to the SQN Technical Specifications are required. 2. The original completion date for this milestone was May 2018. Due to resolution of TVA comments, the final report was not issued until June 15, 2018.}}