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ALARA Performance at OPG. Scott Cameron Manager Radiation Protection 2008 International ALARA Symposium. Overview. Introduction Dose Reduction Initiatives Human Performance Improvements Future Challenges. Dose Reduction Initiatives: Darlington Installation of Submicron Filtration.

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Presentation Transcript

Scott Cameron

Manager Radiation Protection

2008 International ALARA Symposium


  • Introduction

  • Dose Reduction Initiatives

  • Human PerformanceImprovements

  • Future Challenges

Dose reduction initiatives darlington installation of submicron filtration
Dose Reduction Initiatives:DarlingtonInstallation of Submicron Filtration

  • HTS bleed filter pore size reduced in steps from 2 uM to 0.45 uM in May/2002 and 0.1 uM in Dec/2003

  • Increased filter replacement rate was driven by dose rate not ΔP

  • Contribution to dose savings: 130 rem for Unit 1 since 2004

Dose reduction initiatives remote monitoring
Dose Reduction Initiatives:Remote Monitoring

  • Teledosimetry for dose monitoring and Rx face scan

Remote readout of gamma and tritium levels at airlock (HP)

Dose reduction initiatives shielding applications
Dose Reduction Initiatives: Shielding Applications

  • Water wall for on-power Airlock EQ work – 3 rem dose and 4 M$ outage critical path savings

  • Water bag for ECI hot spot shielding

  • Face shielding

Rx Shield Block Data:

Each block weighs 22 lbs with a 7” hole cut out

15 min and 14 mrem to install 35 blocks

Shielding effectiveness: Before shielding – 90 mrem/h, after shielding – 42 mrem/h

Dose reduction initiatives decontamination
Dose Reduction Initiatives: Decontamination

  • Application of strippable Decon Gel

  • Example:

  • HX1 room floor Coated and peeled the next day

  • Before – 5000 cpm

  • After - 0 cpm

  • Peeling - 4.5 mrem/h C

Internal dose reduction outage tritium reduction alara plan
Internal Dose Reduction: Outage Tritium Reduction ALARA Plan

  • Action Levels established with pre-determined corrective actions

  • Reduce closure plug leakage (CP tightening, PHT low level drain state to reduce static pressure)

  • Install portable dryers (96% capacity factor, 24 drums of D2O, 1200 Ci extracted from vault air)

  • Contain and reduce tritium @ airlocks (H3 <0.1 MPCa outside AL)

Munter Dryer

Human performance improvement impact of worker practice
Human Performance Improvement:Impact of Worker Practice

  • Human performance has a large impact on the effectiveness of RPPE:

  • Good RP practice can increase protection factor (PF) by a factor of 2

  • Human performance can be improved by communication and focused O&C’s

1st wave of intense communication

Human performance improvement example of worker communication campaign
Human Performance Improvement:Example of Worker Communication Campaign

Communication campaign to emphasize impact of unplugged time on tritium uptake:

Video presentation and posters

Outage handbook

Safety meetings

Human performance improvement coaching monitoring follow up
Human Performance Improvement:Coaching, Monitoring & Follow-up

Daily dose monitoring and follow-up of EPD dose and tritium uptake

Action levels:

  • 3 uCi/l or 10 mrem EPD – follow-up with worker/supervisor

  • 10 uCi/l above planned or EPD alarm – department EFDR, SCR

  • 35 uCi/l above planned or 100 mrem above EPD alarm – root cause investigation

    Performance management

  • Focused observation and coaching (O&C) by RP staff

  • Interview by RPM and RHP for significant events or repeats

  • RP qualification review of worker and supervisor

Alara achievement
ALARA Achievement

Three Consecutive WANO Strengths in ALARA 2007, 2008 WANO:

  • High standards in RP have been set and achieved

  • Robust controls prevent unplanned exposures

  • Extensive ALARA planning, innovative shielding and aggressive tritium reduction

  • Reactor face shielding

  • On-line tritium / gamma system

Future challenges 2 reduce dose rate in ht system by 25 by 2011
Future Challenges:2. Reduce γ dose rate in HT system by 25% by 2011

  • Gamma scans identify Co-60 as the dominant source of radiation

  • More than 80% of Co-60 originates from FM stellite ram balls

  • Long term plan: COG joint/R&D project to develop replacement

  • Short term plan: FM filtration improvement – submicron filters & IX