ML13182A066
| ML13182A066 | |
| Person / Time | |
|---|---|
| Site: | Watts Bar, Sequoyah  |
| Issue date: | 06/27/2013 |
| From: | Tennessee Valley Authority |
| To: | Andrew Hon Plant Licensing Branch II |
| Hon A | |
| Shared Package | |
| ML13256A390 | List: |
| References | |
| Download: ML13182A066 (15) | |
Text
S h
d W tt B N l
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Sequoyah and Watts Bar Nuclear Plants 1st Quarterly Update for the Improved Flood Mitigation System June 27, 2013
Agenda Introduction Joe Shea, Vice President Nuclear Licensing Improved Flood Mitigation System Update Joe Shea Andrea Sterdis, General Manager Project Management N il G G
l M Neil Gannon, General Manager Fukushima Response Project Closing Remarks Joe Shea Closing Remarks Joe Shea 2
TVA Nuclear Power Group
Improved Flood Mitigation System Update p o ed ood t gat o Syste Update
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems TVA Commitment Submitted in Letter dated April 16, 2013:
- Implement an improved flood mitigation system at SQN Units 1 and 2 and WBN Units 1 and 2 by December 31, 2016
- Provide periodic written updates regarding progress of the project by the last day of March, June, September and December of each y
y p
year until the project is completed, beginning with the first written progress report to be by filed by June 30, 2013.
gy q p g
Units 1 and 2 on or before June 30, 2013.
4 TVA Nuclear Power Group
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Key Safety and Regulatory Aspects of Flood Mitigation System Commitment:
- Provide Additional Margin and Improve Protection Against Flood Hazards
- System Is In Addition to TVA Design and Strategy for Responding
- System Is In Addition to TVA Design and Strategy for Responding to Beyond Design Basis Events (FLEX)
- Flood Mitigation System Design May Leverage Elements of FLEX Strategy
- System is Not Required for Compliance with Current Licensing Basis for Flood Protection
- Current Licensing Basis for Flood Protection Is Adequate 5
TVA Nuclear Power Group g
q
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Key Design Functions and Features in April 16, 2013 Commitment Letter:
- Improved Decay Heat Removal During Flood Mode
- Additional Reactor Coolant System Makeup and Criticality Control Capability During Flood Mode
- Provide Protection for Flood Mitigation System With No Less Than Fifteen Feet Margin Above Current Probable Maximum Flood Levels
- Protection for Power Supplies o ec o o
o e Supp es
- Protection for New Decay Heat Removal and RCS Makeup Capability
- Provide Clean Water Supply 6
TVA Nuclear Power Group
- Develop Maintenance and Testing Capability
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Transition from Commitment into Design and Construction Process:
- April 16, 2013 Commitment Informed by Conceptual Engineering A
h Approach
- Sufficiently Informed to Make December 2016 Schedule Commitments
- Fulfillment of Commitment Will Be Assured Through TVA Project Controls and Engineering Design Process
- Engineering Design and Project Controls Process Provide for Rigorous Evaluation of Final Design Prior to Start of Rigorous Evaluation of Final Design Prior to Start of Construction
- Some Design Aspects Will Evolve From Conceptual Design
- Key Design Functions and Features Will Remain 7
TVA Nuclear Power Group Unchanged
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Key Concepts That May Evolve Through Application of Engineering Design and Project Controls Process:
Design of Hardened Structure
- Use of Flood Elevated FLEX Equipment Storage Building vs.
D i
f St d Al Fl d Miti ti S
t B ildi Design of Stand Alone Flood Mitigation System Building
- Final Decision on Building Design Will Include Consideration of Impacts on Compliance Schedule for FLEX Mitigation Order
- Final Decision on Building Design Will Ensure Minimum of
- Final Decision on Building Design Will Ensure Minimum of Fifteen Feet of Margin Above Current PMF Levels
- Final Building Decision Will Include Consideration of Risk Improvements for Scenarios Other Than Flooding 8
TVA Nuclear Power Group
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Key Concepts That May Evolve Through Application of Engineering Design and Project Controls Process (Continued):
Power Source for Flood Mitigation System
- April 16, 2013 Commitment Letter Discussed FLEX 3MW Di l G t
Diesel Generators
- Subsequent Additional Engineering Assessment Indicates that 3MW DGs May Be Too Lightly Loaded During Flood Mitigation System Operation y
p
- Resolution of DG Loading Challenges May Warrant Consideration of Additional Protected DGs Dedicated to Flood Mitigation System 9
TVA Nuclear Power Group
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Key Concepts That May Evolve Through Application of Engineering Design and Project Controls Process (Continued):
- April 16, 2013 Commitment Letter Discussed Condensate R
S t
Recovery System
- Subsequent Additional Engineering Assessment Indicated Potential Reliability Challenges
- Resolution of Decay Heat Removal Condensate Recovery Resolution of Decay Heat Removal Condensate Recovery Challenges May Warrant Consideration of Large Protected Clean Water Source in Once-Through Process 10 TVA Nuclear Power Group
SQN and WBN Improved Flood Mitigation System Introduction Commitment to Improved Flood Mitigation Systems Description of Project Controls Process (Subsequent Slides)
Includes Key Project Milestones and Current Schedule Will Form Basis for Future Updates to NRC On Progress Update and Status on April 16, 2013 Progress Report Commitments June 30, 2013 Written Progress Report June 30, 2013 Written Progress Report June 30, 2013 Updated Strategy on Watts Bar Unit 1 and 2 FLEX Equipment Storage
- Submit by July 15
- Reaffirm Commitment to Watts Bar FLEX Strategy and Schedule
- Changes to Watts Bar FLEX Equipment Storage Will Be Included in Periodic Required FLEX Updates 11 TVA Nuclear Power Group Included in Periodic Required FLEX Updates
SQN and WBN Improved Flood Mitigation System Project Management and Design Process Develop Project Plan Develop System Design Criteria P
j t
Identify Initial System Design Functions Develop High-Level System Design Requirements Define Initial System Scope Develop Initial Project Schedule and Estimate Conduct Pre-Project Risk Identification Project Planning Develop Conceptual Design Document Identify Long-Lead Items Conduct Plant Walkdowns Reflecting Conceptual Design Develop Design Schedule and Estimate Develop Initial Implementation Schedule Revise Risk Register and Risk Management Conceptual Design Ph p
p and Estimate g
g Strategies.
Evaluate Design and Component Alternatives 10% DCN Development and Review Design Schedule and Estimate Phase Evaluate Long-Lead Vendor Alternatives High level Implementation Schedule and Estimate Detailed Engineering Schedule and Estimate Conceptual Design Risk Register and Risk Management Strategies Develop Implementation Schedule and Estimate based on 10% DCN Preliminary Design Phase 12 TVA Nuclear Power Group Estimate based on 10% DCN
SQN and WBN Improved Flood Mitigation System Project Management and Design Process Complete Engineering Procure Long-Lead Materials Develop Detailed Pre-Outage and Outage Work Schedules Conduct Detailed Design and Operational Walkdowns Engineering And Work Schedules Walkdowns Identify Detailed Commodity Needs Plan Implementation Work Orders Revise Risk Register and Mitigation Strategies to address Completed Design, Implementation Work Plans and Materials Long Lead Procurement Phase Implementation Complete Physical Implementation Conduct System Testing Perform QA/QC Verifications of As-built Update Design Documentation Implementation Phase Implement Project Controls to Monitor Progress Against Resource Loaded Schedule Plan Implementation Work Orders Update Procedures/Conduct Training System Turnover And Closure Turnover System Close Work Orders, DCNs and POs 13 TVA Nuclear Power Group Phase Verify Documentation Complete Evaluate and Document Lessons-Learned
SQN and WBN Improved Flood Mitigation System Project Status - Preliminary Schedule Task Scheduled St t
Scheduled Fi i h Status Task Start Finish Status 1
Team Organization Structure 05/29/13 Completed 2
Develop Project Plan 06/01/13 09/30/13 In-progress 3
Perform Conceptual Design Phase 06/01/13 09/30/13 In-progress 4
Perform Preliminary Design Phase 10/01/13 02/27/14 Not Started 5
Conduct Engineering Design Phase 03/01/14 01/29/15 Not Started 6
Procure Long-Lead Items 11/01/13 01/29/15 Not Started 7
Implementation 02/28/15 12/15/16 Not Started 8
Project Closeout 12/16/16 09/30/17 Not Started 14 TVA Nuclear Power Group
Cl i
R k
Closing Remarks