inpo presentation - sequoyah sgrp
TRANSCRIPT
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Sequoyah SGRP / U2R18 Outage
Sequoyah Nuclear PlantD. Alan DayRadiation Protection Manager
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Sequoyah Nuclear, TVA
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SQN Overview• Two Units (1200 MWe each) • Westinghouse 4 loop Ice Condenser PWR• Unit 1 began commercial operation 7/1/81, licensed
through 2020• Unit 2 began commercial operation 6/1/82, licensed
through 2021• NRC license extension under review for 2040 and 2041
SQN/WBN Typical Non Ice CondenserPrimary Containment Volume 1.2M ft3 vs. 2.0 M ft3
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SGRP Project Overview• Manufacturer – Doosan (South Korea)• Designer – Westinghouse (Chattanooga, TN)• Installer - SGT• SGs delivered to TVA in November 2010• U2R18 Outage duration = 93.3 days• Passage through the Containment roof• Large Mammoet crane• 24 heavy lifts• Construct OSGSF• Demob and restoration
SQN/WBN Typical Non Ice CondenserPrimary Containment Volume 1.2M ft3 vs. 2.0 M ft3
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Construction of SG Storage Facility
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OSGSF
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Annulus Work
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Erection of PTC Mammoet Crane
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Building Containment Super Structure
Dept. NameTVA-SQN12
Dome Concrete Cutting by Hydro-Demolition
Dept. NameTVA-SQN
Dome concrete removal 20’ x 45’ section
Dept. NameTVA-SQN
Steel Containment Vessel (SCV) liner removal
Dept. NameTVA-SQN
Enclosure Plug removal
Dept. NameTVA-SQN16
Old Steam Generator Removal
Dept. NameTVA-SQN17
Old Steam Generator Transport to OSGSF Storage Facility
Dept. NameTVA-SQN18
New Generator readied for heavy lift installation
Dept. NameTVA-SQN19
New SG heavy lift into Containment
Dept. NameTVA-SQN20
Enclosure Plug re-installation
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Top of Containment - looking in
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Dept. NameTVA-SQN22
Steel Containment Vessel (SCV) liner re-installation
Dept. NameTVA-SQN23
Ready for Dome Concrete
Mechanical rebar splices
Dept. NameTVA-SQN
DomeConcrete complete
Dept. NameTVA-SQN
Last Steam Generator being placed in OSGSF storage facility
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New Decon Building
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SGRP Stats and Lessons Learned
• Dose: 156.569 Rem Goal: 158 Rem BOP: 64.661 Rem Goal: 66 Rem Total: 221.230 Rem Goal: 224 Rem• PCEs: 5 Goal: 65 BOP: 17 Total: 22 (0.24 PCEs/day)• No HRA/LHRA Violations• Lessons Learned or Concerns
– RP resources (staffing, experience, training)– Open Containment (environment challenges)– Radiography (inefficiency and SCV liner event)– RAM Control
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Dose Reduction Initiatives
• Sufficient number of staff-augmented RP personnel to coach and monitor
• Extensive mockup training• Pipe End Decon (decon of RCS piping cuts to
lower dose and contamination levels)• Temporary shielding (tons)• Integrated water plan • Lighted ropes• Remote cameras, temp, fire protection, etc. • Station ALARA Committee involvement
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PCE Reduction Initiatives
• Sufficient number of staff-augmented RP personnel to coach and monitor
• Use of OREX disposables• Down draft SOPs• HEPA Vac usage• Pipe End Decon• Equipment surveyed prior to shipment to SQN• Aggressive mop/vacuum regimen• Aggressive trash removal
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RP Business Plan Initiatives
• Remove high source term old SGs• Install permanent SG Primary Platforms• Install Refuel Bridge shielded mats• Raise Zinc Injection rate to 10 ppb (2 cycles)• Ultrasonic Fuel Cleaning (next 2 cycles)• Decon and vacuum Fuel Transfer Canal
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The End… Questions?
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