inpo presentation - sequoyah sgrp

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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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