The application to fusion environments of materials data derived from fission reactors involves considerations related not only to neutron spectra but also the often dominant effect of displacement rate. It is shown in this paper that fission-fusion correlation experiments directed toward helium effects and PKA recoil spectra are frequently difficult to interpret due to the strong influences of displacement rate, low energy recoils from thermal neutron absorption and in some cases a large influence of solid transmutants. It is also shown that materials data published in earlier decades must be reevaluated in light of recent advances in defining irradiation parameters.

B. Assumes any liabilities with respect to the us= of, 6r for damages resulting from the use of any information, qpparatus, method, or process disclosed in,ikis report. As used in the above, *person acting on behalf a+ the Commission' includes cany employee or coptractor of the Commission, or employee of such contractor, to the exrent that such employee or contractor ctor 06 the ~ommlssion, or employee of such cantractor prepares, disseminates, ar provides access to,. ~y information pursuant to his employment or contract with the Commission, or his employment with ' such ,contractor.

Data from t h e P a c i f i c Northwest L a b o r a t o r y (PNL) andArgonne N a t i o n a l L a b o r a t o r y (ANL) d o s i m e t r y t e s t as a n a l y z e d by P N L , y i e l d t h e r e s u l t of 2 . 1 x 10'' n / c m 2 -s e c f o r t h e t o t a l f l u x l e v e l a t EBR-I1 Row 2 -midplane as measured i n a dosimet r y s t r u c t u r a l subassembly and a t a s t a t e d r e a c t o r power of 50 MW. The v a l u e of 2 . 1 x 1015 n / c m 2 -s e c now a g r e e s t o w i t h i n ~1 0 t o 15% w i t h v a l u e s b a s e d on r e a c t o r p h y s i c s and power cons i d e r a t i o n s and f u e l burnup measurements. P r e v i o u s l y r e p o r t e d l a r g e r d i f f e r e n c e s a r e a t t r i b u t e d mainly t o use of i n c o r r e c t c r o s s s e c t i o n s d a t a and i n t h e s t a t e d v a l u e of low power f o r Run 25a. R e s u l t s from a number of f a s t r e a c t o r t e s t s r e q u i r e a r e d u c t i o n i n p r e v i o u s l y r e p o r t e d EBR-I1 c o r e s p e c t r a l a v e r a g e d c r o s s s e c t i o n v a l u e s of 25% f o r t h e 5 4~e ( n , p ) and 30% f o r 5 8~i ( n , p ) r e a c t i o n t o a c h i e v e c o n s i s t e n c y w i t h r e s u l t s from f i s s i o n r e a c t i o n s .Measured r e a c t i o n r a t e s were u s e d t o g e n e r a t e f l u x -s p e c t r a s o l u t i o n s f o r d i f f e r e n t r a d i a l and a x i a l l o c a t i o n s . For Row 2 -a x i a l l y , f l u x -s p e c t r a l d i f f e r e n c e s were o b s e r v e d between low and h i g h power and between t h e edge and c e n t e r of a s t r u c t u r a l subassembly. I t i s concluded t h a t f i s s i o n and n o n f i s s i o n f l u x m o n i t o r s a r e n e c e s s a r y i n e x p e r im e n t a l s u b a s s e m b l i e s t o s e c u r e a c c u r a t e f l u x and f l u e n c e d a t a f o r m a t e r i a l s i r r a d i a t i o n t e s t s i n EBR-I1 .

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