Three kinds of capsules containing natural UO
2 pellets were irradiated in the EFTL-2 irradiation facility of JRR-2. EFTL-2 is a hydraulic rabbit designed by the authors and completed in 1963. The purpose of the present irradiation is:
(1) To assemble basic data pertaining to EFTL-2 when carrying fuel capsules under irradiation.
(2) To ascertain the correctness of capsule design and to compare calculations with experimental data.
(3) To gather information on the effects of irradiation on natural UO
2 pellets of the same dimensions as fuel used in the JPDR.
This is the first experiment undertaken in Japan on UO
2 pellet irradiation, and consequently the irradiation capsule has been designed very conservatively to incorporate every precaution to ensure safety precautions.
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