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By B.E. Keen, M. Huguet and R.M. Hemsworth (Eds.)

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The numbers are the ratios of the calculated fusion inventory to the calculated fission inventory at three times after shut down. 2 x l < T 4 1 . 3 ESECOM case 1. 05 30 R. S. Pease / Safety and environmental issues of fusion The minimum inventory of a fusion reactor is repre­ sented by the tritium inventory, which is an inescapable feature of a D -T fusion reactor. Although the magni­ tude is uncertain for the reasons discussed above, it is many orders of magnitude less than the inescapable inventory of a PWR.

The levels of heat generation after shut-down in components of the JE T machine have also been calcu­ lated, but are only significant in the vacuum vessel. Even in this case the heating falls below 1 W /te within 2 years, and therefore will not be a limitation on packaging and storing decommissioning waste. The ex­ pected limitation in a deep repository is an average heat generation of 2 W per 500 litre drum, corresponding to 4 W /te at a packing density of 1 te /m 3. In addition to neutron induced activity, the vacuum vessel and in-vessel com ponents will be radioactive as the result of absorbed tritium.

Acknowledgments I am very grateful to my colleagues on the EEF Study Group, Dr. J. Darvas, Dr. H. Flowers, Dr. L. Gouni, Dr. G. Grieger, Dr. K. Köberlein and Professor A. Roncaglia for their many contributions to my under­ standing of this subject and for help with material for this paper. References [1] F. W. Kennedy, Proc. Nucl. Fus. Reactors Conference, BNES, 1969, p. 64. [2] W. , Fusion and Fast Breeder Reactors, IIASA Report RR-77-8 (1977). [3] IAEA: Fusion Reactor Safety, IAEA-TECDOC-440, Vienna (1987).

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