report. t NOTICE 1 b -1 1 T h i s report w a s prepared by Southern Science Applications, . Inc., (SSA) a d i v i s i o n of Black & Veatch, as an account of work sponsored by the United States Governmen't. Neither t h e United States, the Arms Control and Disarmament Agency, SSA8 Black & Veatch, n o r any of their employees, c o n t r a c t o r s , s u b c o n t r a c t o r s o r t h e i r employees, nor any person a c t i n g on t h e i r behalf: express o r i m p l i e d , w i t h respect t

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... t h e accuracy, completeness, o r usefulness of t h e information, apparatus, method, o r p r o c e s s disclosed i n t h i s report may n o t i n f r i n g e p r i v a t e l y owned r i g h t s ; o r (b) assumes any l i a b i l i t i e s w i t h r e s p e c t t o the u s e of, or f o r damages r e s u l t i n g from the u s e of, any information, apparatus, method, or process disclosed i n t h i s (a) make any warranty o r r e p r e s e n t a t i o n , I ! ! I i-L i c, i i i i r m Lcl d u Y Y Y ILI m Section and Title 1.0 2.0 3.0 4 . 0 5.0 6.0 TABLE OF CONTENTS Page' No. m Y m lu J m Iri J Ir I Y Y Y LI1 d J d cu Ipr 1 Figure No. 12 13 14 LIST OF ILLUSTRATIONS (Cont'd) Ka, as a function of fuel exposure for HTGR-GASSAR irradiation of mixed uranium and thorium oxide fuels for a once-through fuel cycle. Heavy water reactor vertical cross-section. Heavy water reactor flow diagram. Y LJ Lr Y YJ lccr Y Y 1.0 I 1 b d J