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Thie report was prepared as an account of Government sponsored work. Neither the United States. nor the Commission. nor any person acting on behalf of the Commlssion:A. M&ee any warranty or representation, expressed o r implied. with respect to the accuracy, completeness. or usefulness of the information contained in tble report, or that the use of any information. apparatus. method. or process dlsclosed in this report may not Infrlnge privately owned rlghts; or B. Assumes any liabilities with r e~p e c t to the use of. or for damages resulting from the use of any informatlon, apparatus. method. or process disclosed in W e report.As used In the above. "person acting on behalf of the Commiaelon" includes m y employee or.:contractor of the Commission. o r employee of such contractor. to the extent that such employee or contractor of the Commission, or employee of such contractor prepares.dlesemlnates, or provides acce88 to, any information p u r '~u~o t to hls employment or contract with the Commission. or his employment with such contractor. h e a t e d r e a c t o r f u e l m a t e r i a l s s t a r t e d a t ORNL i n 1955 as a two-man e f f o r t t o s u p p l y d a t a needed t o d e t e r m i n e t h e h a z a r d of n u c l e a r r e a c t o r a c c i d e n t s . These s t u d i e s , which have c o n t i n u e d and expanded s i n c e t h a t t i m e , have g e n e r a t e d a g r e a t d e a l of d a t a on a v a r i e t y of r e a c t o r f u e l s . Much of t h i s i n f o r m a t i o n w a s r e p o r t e d i n documents t h a t r e c e i v e d l i m i t e d d i s t r i b u t i o n . T h i s r e p o r t c o n t a i n s a d i sc u s s i o n of f a c t o r s a f f e c t i n g f i s s i o n p r o d u c t release, a d e s c r i p t i o n of t e c h n i q u e s d e v e l o p e d i n t h e s e s t u d i e s, a c o m p i l a t i o n of d a t a o b t a i n e d i n t h e 11-year p e r i o d c o v e r e d by t h e r e p o r t , some i l l u s t r a t i o n s of t h e u s e of t h e d a t a , and some recommendations f o r f u r t h e r r e s e a r c h .

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