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G. Teodorov, A. Sandru, L. Toro MATE-FIN Ltd. Bucuresti

TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING. www.matefin.com. Characterisation of Low Level Radioactive Waste from Cernavoda NPP. G. Teodorov, A. Sandru, L. Toro MATE-FIN Ltd. Bucuresti Department of Radioactive Waste Management Solutions. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING.

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G. Teodorov, A. Sandru, L. Toro MATE-FIN Ltd. Bucuresti

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  1. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com Characterisation of Low Level Radioactive Waste from Cernavoda NPP G. Teodorov, A. Sandru, L. Toro MATE-FIN Ltd. Bucuresti Department of Radioactive Waste Management Solutions

  2. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Outline • Possible characterisation methods • Waste streams • WCAS – Waste Characterisation Assay System • Waste Characterisation Process The 15th National Conference of ICIT, Calimanesti 2009

  3. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com Why characterisation? • Waste acceptance criteria Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  4. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Possible characterisation methods • Radionuclide content assessment based upon theoretical or analogue data; • Dose rate measurement and estimation using reference samples (assuming a known constant isotopic composition); • Easy to measure (ETM) - difficult to measure (DTM) radionuclides • Reference samples • measurement of certain “key nuclides” (ETM) • measurement of DTM radionuclides • Link ETM to DTM by scaling or correlation factors • Assessment of DTM nuclides from measurement of ETM nuclides by scaling factors Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  5. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Waste streams • to be significant for a given category of waste • availability of complete and accurate reference data regarding the waste (e.g. dose rate, date of production, composition, etc) • the activity of relevant radionuclide is high enough to be detected with acceptable uncertainity (above detection limits) The 15th National Conference of ICIT, Calimanesti 2009

  6. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com Tytpical CANDU waste streams Possible waste streams:22 Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  7. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • WCAS – Waste Characterisation Assay System • Designed and commisioned by an international consortium (Quintessa, UK; Wert and Dekom, Slovakia; Josef Stefan Institute, Slovenia; MateFin, Romania) in 2005 • Purpose: characterisation of the radioactive waste by direct measurements and scaling factors The 15th National Conference of ICIT, Calimanesti 2009

  8. Raw waste Segregation by source Segregation by material/activity Waste Inventory Data Representative sampling Bulk Waste Gamma assay of indicator nuclides Application of Correlation Coeffs. Decomposition of sample Sample treatment Charact-erised Waste Separate radio-nuclides of interest Measurement of Alpha emitters Source preparation Measurement of Beta emitters Calculation of Correlation Coeffs. Radiochemistry Measurement Computer Codes TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  9. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • WCAS • Gamma spectroscopy system intended to use for both portable (drum or package scanning) and laboratory (sample measurement) system • Gross alpha and beta activity measurement system • Liquid scintillation system for in nsitu and laboratory measurements • Alpha spectroscopy system • Complete radichemical laboratory • Open digestor • Distillation system • Fume hoods, centrifuge, shaker, etc Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  10. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Waste Characterisation Process Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  11. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Waste Characterisation Process • First step • Charcaterisation of “old” waste • Drum by drum measurement • Uncertainity regarding the content • Preparation for incineration • Simple segregation • solids - reactor and service bulding, compactable or uncompactable • Liquid – different organic liquids • Sample from each drum • ETM, DTM, H3 measurement Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  12. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  13. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • Waste Characterisation Process • Second step • Difficulties to establich proper waste streams • Samples from different part of the processes • Crud samples from primary heat transfer • Wipe samples • Gamma spec for ETM nuclides • DTM nuclides - in work • Scaling factors – in work Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

  14. TECHNICAL MANAGEMENT – PHYSICS AND ENGINEERING www.matefin.com • PORTFOLIO • MATE-FIN in Cernavoda NPP: strongly involved, by firmly contracts, in: • Processing and managing of some categories of radioactive wastes • Maintenance of equipments and technical consulting for the managing of the radioactive wastes • Main supplier of measurement and control equipments as well as for the continuous monitoring of the radioactivity into the plant. Workshop on Auditing and Verification of Radioactive Waste, 1-5 October 2012

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