Annual Progress Rpt - Fuel Element Development [1961]

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Unirradiated M-263 1 - 2 1 500x As Polished B. Figure 25 56% U235 Burnup Microstructure of 20% Enriched, Dispersed in Al - 47 - 54 wt$ U02 J M-511 28-10 520x As Polished A. Unirradiated M-726 28-1 As Polished 500x B. 47% U235 Burnup Figure 26 Microstructure of 30% Enriched, 52 w t Dispersed in Al - 48 - % U02 M-474 29-4 520T As Polished A. Unirradiated M-708 29-1 soox As Polished B. 47% U235 Burnup Figure 27 Microstructure of 40% Enriched, 42 w t % U02 Dispersed in Al - 49 - M-355 30-13 500x As Polished A.

However, e x t r a p o l a t i o n of t h e s e r e a c t i v i t y responses t o give t h e response i n some h y p o t h e t i c a l measurement c o n d i t i o n i s n o t p a s s i b l e because of t h e l i m i t e d range of measurement c o n d i t i o n s a v a i l a b l e i n t h e RMF's h i g h l y t h e r m a l i z e d c e n t e r h o l e . An RME' l a t t i c e p o s i t i o n would be n e c e s s a r y t o approximate MTR c o n d i t i o n s ; a t t h e p r e s e n t time, t h i s i s impossible.

2. Burnup C a l c u l a t i o n s Three methods f o r determining f u e l burnup i n t h e sample f u e l p l a t e s have been used: (1) C a l c u l a t i o n s from f l u x measurements, ( 2 ) i s o t o p i c a n a l y s i s , and ( 3 ) RMF measurements. Good agreement has been found between t h e i s o t o p i c a n a l y s i s and RMF measurements b u t t h e b rnup c a l c u l a t e d from t h e f l u x measurements has been c o n s i s t e n t l y h i g h ( These c a l c u a t ' o n s used t h e unperturbed f l u x d a t a and a volume p e r t u r b a tion factor t o c o r r e c t f o r l o c a l f l u k peaking i n t h e v i c i n i t y o f t h e f l u x wires.

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