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This report describes the radiological impact of sub-seabed disposal of vitrified high level waste, carried out as part of the PAGIS project. The waste was assumed to be placed into the sub-seabed sediments by means of the free fall penetrator technique. Emplacement in a deep borehole was also studied. Three disposal sites were considered: the reference site Great Meteor East in the N.E. Atlantic, and two alternative sites in the N.W. and N.E. Atlantic. Models were used to describe the release of radionuclides from the waste, their migration through the sediments, their subsequent dispersion in the world's oceans and the pathways to man. For the normal evolution scenario, best estimate peak individual dose rates for the penetrator option was evaluated at 2 x 1.0 E-10 Sv/y arising 0.1 million years after emplacement. The collective dose commitment was 10,000 man Sv. The corresponding figures for the borehole option were 2 x 1.0 E-14 Sv/y and 1 man Sv. The risks from seven altered evolution scenarios were also calculated and the risk was predicted to be always less than 1.0 E-9 /y. Uncertainty and sensitivity analyses were also performed and showed that the peak dose was most sensitive to variations in Kd values, pore water velocity, pore water diffusivity and burial depth.

Additional information

Authors: MOBBS S F, National Radiological Protection Board, Chilton (GB);CHARLES D, National Radiological Protection Board, Chilton (GB);DELOW C E, National Radiological Protection Board, Chilton (GB);MCCOLL N P, National Radiological Protection Board, Chilton (GB)
Bibliographic Reference: EUR 11779 EN (1988) FS, 818 pp., ECU 60
Availability: (2)
ISBN: ISBN 92-825-9257-X;CD-NA-
Record Number: 198910705 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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