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Assessment of Hard-to-Detect Radionuclide Levels in Decommissioning Waste from the Bohunice NPP-A1, Slovakia, for Clearance and Disposal Purposes.

DE2004828883

Publication Date	2002
Personal Author	Slavik, O.; Moravek, J.; Stubna, M.
Page Count	18
Abstract	For assessments of hard-to-detect radionuclides (HD-RN) contents in various type of radwastes at the NPP-A1, available empirical data referenced to 137Cs (actinides, 90Sr, 99Tc, 63Ni, 14C) and the theoretical assessment for the remaining HD-RN using calculated RN inventory and a simple model with effective relative (137Cs) spent fuel release fractions was applied. The analytical data of extended radiochemical analysis for the existing available operational radwaste forms have been reviewed for this purpose. 137Cs, 90Sr and 241Am were set up as release markers for partial spent fuel release groups of HD-RNs within which the total fractions of HD-RN released to the operational radwastes were assumed to be constant. It was shown by the assessment carried out that 137Cs and HD-RNs 129I, 99Tc, and partly 79Se and 14C are the main contributors to the disposal dose limit for the radioactive concentrate at NPP A-1. In the case of the radioactive sludge from the operational radwaste system the role of predominant dose contributors belongs to actinides 239,240Pu and 241Am. In the case of clearance of radioactive material from the NPP-A1 site, only the reference radionuclide, 137Cs was predicted to be the most dominant dose contributor. In all of these cases the estimated contributions of other hard-to-detect radionuclides to respective disposal or release dose limit are lower by 2 and more orders of magnitude. As a lesson learned, the most attention is proposed to focus on the control and measurement of the critical HD-RNs indicated by the assessment. For the control of less important HD-RNs, the developed release coefficient method is sufficient to be applied.
Keywords	Bohunice A-1 reactor Radionuclides Decommissioning Radioactive wastes Radioactive waste disposal Radioactive materials Actinides Dose limits Spent fuels Radiochemical analysis Sludges Radioisotopes Radioactive waste management
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Vyskumny Ustav Jadrovych Elektrarni, Trnava (Czechoslovakia).; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200510

Assessment of Hard-to-Detect Radionuclide Levels in Decommissioning Waste from the Bohunice NPP-A1, Slovakia, for Clearance and Disposal Purposes.

Assessment of Hard-to-Detect Radionuclide Levels in Decommissioning Waste from the Bohunice NPP-A1, Slovakia, for Clearance and Disposal Purposes.
DE2004828883

Publication Date	2002
Personal Author	Slavik, O.; Moravek, J.; Stubna, M.
Page Count	18
Abstract	For assessments of hard-to-detect radionuclides (HD-RN) contents in various type of radwastes at the NPP-A1, available empirical data referenced to 137Cs (actinides, 90Sr, 99Tc, 63Ni, 14C) and the theoretical assessment for the remaining HD-RN using calculated RN inventory and a simple model with effective relative (137Cs) spent fuel release fractions was applied. The analytical data of extended radiochemical analysis for the existing available operational radwaste forms have been reviewed for this purpose. 137Cs, 90Sr and 241Am were set up as release markers for partial spent fuel release groups of HD-RNs within which the total fractions of HD-RN released to the operational radwastes were assumed to be constant. It was shown by the assessment carried out that 137Cs and HD-RNs 129I, 99Tc, and partly 79Se and 14C are the main contributors to the disposal dose limit for the radioactive concentrate at NPP A-1. In the case of the radioactive sludge from the operational radwaste system the role of predominant dose contributors belongs to actinides 239,240Pu and 241Am. In the case of clearance of radioactive material from the NPP-A1 site, only the reference radionuclide, 137Cs was predicted to be the most dominant dose contributor. In all of these cases the estimated contributions of other hard-to-detect radionuclides to respective disposal or release dose limit are lower by 2 and more orders of magnitude. As a lesson learned, the most attention is proposed to focus on the control and measurement of the critical HD-RNs indicated by the assessment. For the control of less important HD-RNs, the developed release coefficient method is sufficient to be applied.
Keywords	Bohunice A-1 reactor Radionuclides Decommissioning Radioactive wastes Radioactive waste disposal Radioactive materials Actinides Dose limits Spent fuels Radiochemical analysis Sludges Radioisotopes Radioactive waste management
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Vyskumny Ustav Jadrovych Elektrarni, Trnava (Czechoslovakia).; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200510