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This report was prepared as an account of work sponsored by the United States Government. Neither t h e lJnited 5:ites nor t h e Energy Research arid Development Administration, nor any of their employees, nor any of their contraciors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal Irahility 01 responjlbillty for t h e accuracy, completeness o r usefulness of any imformation, apparatus, product or prcycess dtsclosed, or represents that its use would not infringe privately owned rigti;;.

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m o n s t r a t i o n r u n s i n WSEP a t t h e P a c i f i c Northwest L a b o r a t o r y . R a d i o a c t i v i t y p r o c e s s e d was i n c r e a s e d from350,000 c u r i e s i n t h e f i r s t r u n t o 2 , 4 0 0 , 0 0 0 c u r i e s i n t h e s i x t h r u n .The s e l f -g e n e r a t i n g h e a t r a t e w i t h i n e a c h r e c e i v e r w a s t e w i t h i n a f u l l 8-inch d i a m e t e r p o t r e p r e s e n t e d 1 . 3 t o n n e s of power r e a c t o r f u e l ( i r r a d i a t e d a t 2 0 , 0 0 0 MWd/tonne a t a power l e v e l of 1 5 MW/tonne) f o r s u l f a t e -c o n t a i n i n g PW-2 w a s t e and 0 . 6 4 t o n n e s f o r s u l f a t e -f r e e PW-1 w a s t e . High l e v e l aqueous r a d i o a c t i v e w a s t e was p r o c e s s e d a t o v e r a l l r a t e s of 9 . 4 t o 18 l i t e r s / h r .The e q u i v a l e n t p r o c e s s i n g r a t e s ranged from 0.20 t o 0 . 6 1 tonnes/day of o r i g i n a l f u e l . From 2 t o 1 0 % of t h e t o t a l ruthenium f e d t o t h e s o l i d i f i e r was v o l a t i l i z e d and/ore n t r a i n e d from t h e s o l i d i f i e r ; e n t r a i n m e n t of n o n v o l a t i l e s v a r i e d from 0 . 2 t o 0 . 3 % . V o l a t i l i z e d and e n t r a i n e d m a t e r i a l from t h e d e n i t r a t o r was f u r t h e r t r e a t e d i n t h e WSEP a u x i l i a r y p r o c e s s equipment, w h i l e t h e v o l a t i l i z e d and e n t r a i n e d m a t e r i a l from t h e m e l t e r was c o l l e c t e d i n a s e p a r a t e c o n d e n s a t e r e c e i v e r .iii s i g n i f i c a n t p r e s s u r e i n c r e a s e s w i t h i n t h e c o n t a i n e r s a f t e r t h e y were capped and welded.