Final reports on PT 105-551-A and Supplement A, 'High exposure thorium' and PT 105-516-A, 'Effects of irradiation of thorium slugs'

摘要

This report discusses Production Test 105-516-A which was written to determine the stability by both measurement and visual examination, of thorium slugs as used in flattening columns to exposures in excess of 400 MWD/AT. Both rolled and extruded thorium slugs were used; the highest exposures reached were about 1000 MWD/AT. Also discussed is Production Test 105-551-A which was written to demonstrate the stability of thorium slugs as used in flattening columns at exposures up to approximately 1500 MWD/AT; the supplement authorized exposures up to 3000 MWD/At. Six tubes of 10-66 material already in the pile were chosen; these have been discharged at exposures varying from (approximately)1230 to (approximately)2000 MWD/At.