RADIOLOGICAL ASSESSMENT OF THE CONSEQUENCES OF THE SEDIMENTS
A radiological assessment of the consequences of the disposal of high-level radioactive waste (HLW) within the seabed sediments in deep oceans has been performed within the framework of the International Seabed Working Group. The assessment was made with both a deterministic and stochastic methodology. No significant differences were found between the two sites analysed although the quality of their sediments is slightly different. For the base case, the peak individual dose is of the order of 2.8times10"-9" Sv.a"-1" occurring 150,000 years after disposal with an uncertainty between 3times10"15" and 3times10"-8" Sv.a"-1". The collective doses integrated to 105 years are in the order of 2.2times103 person-Sv and to 107 year of 2.8times104 person-Sv. For abnormal scenarios, it was found that the seabed option was extremely insensitive to a large number of components of the system. Only three scenarios were found to increase the doses significantly: item"1." emplacement of penetrators at a depth <10 m in the sediment; item"2." existence of an upward pore water velocity in the sediments; item"3." change in the radionuclide retention properties of the sediments.par Doses arising from transportation accidents could be very severe, especially for accidents in coastal waters. However, it is possible to design a transportation vessel and organize recovery actions, so that the probability of occurrence of such doses is extremely small and, in practice, negligible. The results of this radiological assessment thus show that, as analysed, the disposal of HLW in subseabed sediments is radiologically a very acceptable option. This is true insofar as the assumptions, models and data used in the calculations can be validated.
Bibliographic Reference: ORAL PRESENTATION: OXFORD (UK), SEPT. 20-21, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34266 ORA
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Record Number: 1989126116400 / Last updated on: 1989-06-01
Available languages: en