By D. A. Daavettila, Argonne National Laboratory, U.S. Atomic Energy Commission

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T h e c o r e i s m a d e up of a s e r i e s of c i r c u l a r p o l y e t h y l e n e d i s c s , 25 c m in d i a m e t e r . It c o n t a i n s 20% e n r i c h e d U 0 2 and has a c r i t i c a l m a s s of a p p r o x i m a t e l y 650 g U 2 3 5 . T h e c y l i n d r i c a l c o r e is s u r r o u n d e d by a g r a p h i t e r e f l e c t o r , 20 c m t h i c k , and i s s h i e l d e d by 10 c m l e a d and 55 c m w a t e r . T h e c o r e and p a r t of the r e f l e c t o r a r e c o n t a i n e d in an a l u m i n u m tank w h i c h has r e - e n t r a n t t h i m b l e s in its b a s e , into w h i c h f o u r c o n t r o l and s a f e t y r o d s a r e i n s e r t e d .

The p o s i t i v e a s y m p t o t i c p e r i o d T = 1/cjdo c a n e a s i l y be d e t e r m i n e d f r o m a plot of neutron population v e r s u s t i m e . The p e r i o d is defined as the t i m e it takes the neutron l e v e l to i n c r e a s e by a f a c t o r of e after the t r a n s i e n t t e r m s have died out. Another important p a r a m e t e r is the doubling t i m e . This is defined as the t i m e it takes the neutron l e v e l to double. It is r e l a t e d to the p e r i o d by the following expression: w h e r e t 2 is the doubling t i m e .

10. (c) F l u x P l o t Given in F i g . 11. F i g . 10.

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A Manual of reactor laboratory experiments by D. A. Daavettila, Argonne National Laboratory, U.S. Atomic Energy Commission


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