Technical justifications for accreditation of internal body contamination equipment at EDF NPP Michèle GONIN (MD) Bernard JEANNIN Yves GARCIER Nuclear Production Department
19 NPPs 19 occupational health services 39 whole body counters For internal exposition monitoring
Internal exposure monitoring program High energy in vivo monitoring (range from 100 keV to 3 MeV) shielding 2 NaI detectors Data processing and analysis Display and data storage Whole body counters
To assure the quality of the tests and/or calibration results Accreditation requirements according to the international standard ISO/CEI 17025 General requirements for the competence of testing and calibration laboratories Management system for quality Plan Customer’s request Quality policy Statement Do Objectives Regulations Management reviews Complaints Act Corrective and preventive actions Indicators Analysis of data Non conforming Tests results Internal audits Check To assure the quality of the tests and/or calibration results
Accreditation requirements according to the international standard ISO/CEI 17025 General requirements for the competence of testing and calibration laboratories Management system for technical operations Tests and calibration methods verification of methods Characterisation of equipment Calibration and measurement traceability to SI units Quality control procedures Interlaboratory comparisons Estimate of uncertainty of measurement Qualification of operators : education and training programs
The national project EDF national technical requirements : Specify tests for evaluating technical performance secifications Establishment of programs and operating procedures GOLFECH NPP PALUEL NPP 2 reference whole body counters : evaluate technical performances Test programs and operating procedures 37 Whole Body Counters 19 anthropogammametric measurements units Are in operation at occupational healths services
Efficiency calibration and comparisons Requirement = Traceability to the SI units Primary reference phantoms « IGOR » Radioactive sources Reference values of efficiency « true value of activity »
IGOR phantom « primary phantom »
Efficiency calibration and comparisons Traceability to the SI units Calibration phantoms « Canberra » Radioactive sources Reference Values of efficiency To be compared to measured values « systematic error »
Canberra phantom « Calibration Phantom »
Comparison of calibration results between primary and calibration phantoms Cs-137 Co-60 Systematic error 5 %
Comparison efficiency values among equipment tests results Comparison efficiency values between equipments Bias 4 to 10% Source 1 Ba-133 Cs-137 Co-60 Source 2 Y-88 Y-88
Technical performance Linearity : effective range of measurement 100 kBq (Cs-137) 58 kBq (Co-60)
Technical performance Maximum count rate : 26 000 c/s (source out phantom) 47 000 c/s (source in phantom to be verified) 0,9 26 324 c/s
Conclusion Accreditation program for internal dosimetry achieves : Accreditation program for internal dosimetry achieves : High quality of results Validation the performance of equipment Increased customer’s satisfaction