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ST 2.1 –
Radiación natural, NORM y TENORM
RADIOLOGICAL IMPACTS ANALYSIS WITH USE OF NEW ENDPOINT AS
COMPLEMENTARY SAFETY INDICATORS
Peralta Vital, José Luis
1
*; Gil Castillo, Reinaldo H.
1
; Olivera, Jorge
2
;
Fleites Estevez, Gema
1
1
Centro de Protección e Higiene de las Radiaciones (CPHR). Cuba.
2
Instituto de Geofísica y Astronomía. Cuba.
* Responsible author, email: peralta@cphr.edu.cu
The paper shows the new safety indicators on risk assessment (safety assessment) to
radioactive waste environmental management implementation (concentrations and fluxes of
naturally occurring radioactive materials (NORM)). The obtained endpoint allows the best
analysis of the radiological impact associated to radioactive waste disposal system. The
common safety indicators for safety assessment purpose, dose and risk, are very time
dependent, increasing the uncertainties in the results for long term assessment. The
complementary and new proposed endpoints are more stable and they are not affected by
changes in the critical group, pathways, etc. The NORM values on facility site were obtained as
result of national surveys, the natural concentrations of U, Ra, Th, K has been associated with
the variation of the lithologies in 3 geographical areas of the Country (Occidental, Central and
Oriental). The results obtained are related with the safety assessment topics and allowed to
apply the new complementary safety indicators, by comparisons between the natural
concentrations and fluxes on site and its calculated values for the conceptual repository design.
In order to normalize the concentration results, the analysis was realized adopting the criteria of
the Repository Equivalent Rock Volume (RERV). The preliminary comparison showed that the
calculated concentrations and fluxes in the Cuban conceptual radioactive waste repository are
not higher than the natural values in the host rock. According to the application of new safety
indicators, the reference disposal facility does not increase the natural activity concentration and
fluxes in the environment. In order to implement these new safety indicator it has been used the
current
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Ra inventory of the Repository and its natural concentration on the site.