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ALARA STUDIES FOR EDF NUCLEAR POWER PLANTS

ALARA STUDIES FOR EDF NUCLEAR POWER PLANTS. Presentation draft. EDF and UTO presentation From PANTHER-RP simulation tool to practical recommendations The example of in-site recommendations implementation Gain issued from the methodology implementation.

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ALARA STUDIES FOR EDF NUCLEAR POWER PLANTS

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  1. ALARA STUDIES FOR EDF NUCLEAR POWER PLANTS

  2. Presentation draft • EDF and UTO presentation • From PANTHER-RP simulation tool to practical recommendations • The example of in-site recommendations implementation • Gain issued from the methodology implementation H. BERTIN EDF-UTO

  3. 1. A brief presentation of EDF Group and UTO

  4. A brief presentation of the EDF Group • The EDF Group a leading player in the European energy industry. • EDF Group is present in all areas of the electricity value chain, from generation to trading, and active in the gas chain in Europe. • Leader in the French electricity market, the Group also has solid positions in the United Kingdom, Germany and Italy. Breakdown of EDF Group's generation worlwide * Installed capacity RE: Renewable Energies H. BERTIN EDF-UTO

  5. In charge of Fleet Maintenance for EDF NPP’s (Nuclear Power Plants) UTO: a Nuclear Technical Support Unit H. BERTIN EDF-UTO

  6. 2. From PANTHER-RP simulation to practical recommandations

  7. Radiological context PANTHER-RP models and calculations spectrometry data,radiological map = radiological model Maintenance programm = Workstations, task duration Biological protection list = Workstations, task duration Plans et iso = 3D models workstation Source Biological Protection Dose rates calculation for each source and for each workstation Dose rate reduction coefficient calculation for each option H. BERTIN EDF-UTO PANTHER-RP Model

  8. An UTO recommandation example shielding definition • BOUCLE 1 – Local R412 – RCP120VP Radiological protection option – • 12 mm lead shield in front of hot branch Lead matress aound RCP 120 valve • RCP120VP 12 mm lead shield Lead matress - 5 H. BERTIN EDF-UTO

  9. 3. An implementation example

  10. TRICASTIN example • The NPP has identified UTO recommendations in the logistic activities management H. BERTIN EDF-UTO

  11. TRICASTIN example • UTO recommendations are also integrated in the shielding contractor documents Lead Screen RCP 120 VP valve gratting Hot Branch Lead matress H. BERTIN EDF-UTO

  12. 4. Gains

  13. Global dose decrease for a similar outage Shielding contractor dose decrease Global outage dose Shielding contractor dose 680 664,82 660 20 17,63 640 15 TR1 Dose (HmSv) 620 613,617 10 TR1 Dose (HmSv) 600 7,05 5 580 2005(VP) 2007(VP) 0 2005(VP) 2007(VP) Year Year Gains : the integrated dose • In 2006 : radiological gains around 25 H.mSv issued from UTO recommendation implementation compared to implementation based on habits • An optimised shielding implementation : the methodology developed helps NPP in choosing the best ALARA radiation protection options. H. BERTIN EDF-UTO

  14. This progress, based on TRICASTIN example, is due to: More biological protections Contributing sources identification • Justification of the lead mattresses’ thickness from 6 mm to 12 mm • Optimal scenario definition Mechanical stress calculations H. BERTIN EDF-UTO

  15. New biological protection   • Permanent shielding support H. BERTIN EDF-UTO

  16. Conclusion These elements leads to encouraging collective integrated dose decrease compared to the historical and empirical approaches that were previously implemented on-site. A prototype tool, that will help NPPs to analyse the optimal shielding protection implementation scenario, will be tested in 2 years on a real outage in Tricastin in 2010. H. BERTIN EDF-UTO

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