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R I n order t o reduce the heavy water inventory it appeared desirable t o replace a portion of t h e heavy water r e f l e c t o r wfth a less expensive material such as carbon, Calculations were made with t h e 3G3R Code in which t h e c e n t r a l region was considered t o be t h e f u e l , t h e fntermediate region D 0 and the outer 2 region carbon, Figures 21 and 22 show t h e r e l a t i o n s h i p between percent r e a c t i v i t y and various combfnatfons of D 0 and carbon, 2 Figures 23, 24, and 25 show the r e l a t i o n s h i p between various f l u x r a t i o s and d i f f e r e n t r e f l e c t o r combfnatfons.
20 AVERAGE WTEFW3lLATE AND FAST FLUXES I N CENTER REGION TO AirERAGE INTERMEDIATE AND FAST FLUXES I N FUEL; AVERAGE INTERMEDIATE FLUX IN FUEL TO AVEXAGE THERMAL FLUX IN FUEL VS. VOLUME FRACTION OF D20 IN CENTER -47 - i n t h e f u e l f o r varying volume f r a c t i o n s of D20 and A 1 i n the center region, Addition of aluminum t o the center region decreases the multiplication constant as shown i n Figure 1 5 0 It is possible t h a t t h e flux d i s t r i b u t i o n i n the c e n t r a l region could be impruved with a regfon of aluminum or beryllium betwe heavy water.
0 ' I I ' I If? 1 0 20 40 60 80 100 120 R a d i u s , H, cm. F i g . 4 ? 1 \ / / 0 / / / 20 40 60 80 100 Radius, R , cm. F i g . 2 7 SPATIAL FAST, INTERMEDIATE, AND THERMAL FLUX DISTRIBUTIONS W I T H 1/4" BORON SRELL AT OUTER ANNULUS SURFACE -57- 120 shown, each of t h e absorbing s h e l l s between t h e f u e l annulus and t h e heavy water i n t h e IIFRR is capable of handling 60 per cent o r more excess r e a c t i v i t y because of t h e l a r g e c o n t r o l surface exposed t o neutrons.