Progress Report on Fuel Element Development and Associated Projects

Abstract

The f u e l development program a t t h e MTR has sought t o develop improved. economical, l o n g-l i f e f u e l assemblies through a comprehensive s t u d y of v a r i o u s f u e l compositions, enrichments, claddings, burnable poisons, f u e l and poison d i s t r i b u t i o n s , and f u e l element geometry optimizat,ion. 53 53 53 64 75 75 88 88 93 93 93 94 102 102 102 *. a Reverse Side o f P l a t e Shown i n Figure 10. e Edge View of P l a t e Shown i n Figures 10 and 11 Edge V i e w of' P l a t e i n Figures 10 Through 12 A f t e r Being Sectioned and Mounted f o r Metall u r g i c a l Exm,ination. @-*. a * * With I r r a d i a t i o n (22.7 w t $ U02). a. Changes i n Microstructure of Oxide Fuel Core 39 41 .-9-LIST OF FIGURES (Cont ' d)

Annual Progress Report on Fuel Element Development for Fiscal Year 1961

“…The only composition shown i n Figures 8 and 9 i n Here t h e h i g h e r loaded core a l l o y w a s n o t modified I n Figure 9, composition 53N i s of i n t e r e s t f o r two reasons: (1) i t i l l u s t r a t e s a d e f e c t t h a t i s seen t o a lesser degree i n o t h e r p l a t e s , i . e .…”