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

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Q Since this e x p r e s s i o n has been d e r i v e d f o r a s u b c r i t i c a l r e a c t o r , k e f f < 1, the e x p r e s s i o n f o r M may be rewritten after cancelling out Q as M = 1 " keff ' It can be noted f r o m this equation that as k e f f a p p r o a c h e s one, the m u l t i p l i cation a p p r o a c h e s infinity, and l / M would approach z e r o . The e x p e r i m e n t a l a r r a n g e m e n t f o r the approach to c r i t i c a l through use of the fine c o n t r o l rod can be seen in the d i a g r a m b e l o w .

15 CORE CAPSULE Fig. 8 BEARING MAGNET AGN-201 Control Rod Assembly LEAD SCREW DASH POT CHAIN DRIVE MOTOR SYNCHROS 032 Cft 2419 • 0 28 CR 22K> cm r«I 024 F i g . 16 2. Reactor Characteristics a. General Type Homogeneous thermal reactor Principal Uses Education and Training M a x i m u m Operating P o w e r 100 mW Core UO z (20% e n r i c h e d in U 235 ) p a r t i c l e s h o m o g e n e o u s l y distributed in s o l i d polyethylene plastic m o d e r a t o r , c y l i n d r i c a l in shape Reflector Graphite Shield Lead and water Control T w o safety and two c o n t r o l r o d s , fuel l o a d e d b.

R e c o r d y o u r final e s t i m a t e d c r i t i c a l r o d p o s i t i o n s . C. P o s i t i v e P e r i o d M e a s u r e m e n t : A f t e r obtaining c r i t i c a l i t y , i n s e r t one of the c o n t r o l r o d s to a p o s i t i o n which w i l l y i e l d a p e r i o d of about 100 s e c . D e t e r m i n e this p e r i o d by m e a s u r i n g the doubling t i m e of the p o w e r l e v e l on Channels 1 and 3. A f t e r the p o w e r has r i s e n to about 10 m W , return r o d s to their c r i t i c a l p o s i t i o n s , and make c e r t a i n that the p o w e r r e m a i n s constant.

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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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