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

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

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12), it would be i m p o s s i b l e to r e g a i n c o n t r o l r o d power until the b a c k g r o u n d l e v e l had d r o p p e d to startup l e v e l . 25 STUDENT RESULTS APPROACH-TO-CRITICAL EXPERIMENT I. R e a c t o r Run This a p p r o a c h to c r i t i c a l e x p e r i m e n t was p e r f o r m e d with the fine c o n t r o l rod in a o n e - s l a b , north quadrant, c o r e of 1932 g U 235 . II. Results Initial Conditions: Rod P o s i t i o n s : Coarse Water T e m p e r a t u r e : Initial Count Rates (cpm): A p p r o a c h to C r i t i c a l : 50 Fine 0 Shim 0 22.

6 g each) 4 d i s c s , 2 . 2 c m in dia m e t e r , 0 . 40 g U 2 3 5 . 17 c. 2 c m in diameter and 76 c m high. V e s s e l has a 1 - i n . g l o r y h o l e on the horizontal center line and appropriate c o n trol r o d t h i m b l e s . Tank contains c o r e fuel d i s c s and graphite r e f l e c t o r plugs. 8 c m high, separated in half at g l o r y - h o l e m i d plane by a thin aluminum b a f f l e . L o w e r half of c o r e contains a p p r o p r i a t e h o l e s f r o m c o n t r o l and safety r o d thimbles and is part of the safety fuse s y s t e m .

F u r t h e r m o r e , the adequate l o c a t i o n of the d e t e c t o r is a determining f a c t o r in the ability of the i n t e r l o c k to detect unduly l a r g e r e a c t i v i t i e s . In p a r t i c u l a r , the l o c a t i o n d e s c r i b e d h e r e (behind Safety Rod No. 3) is adequate f o r a o n e - s l a b loading in the north end of the c o r e . A r e a Monitors T h r e e 2 7 - l i t e r ionization c h a m b e r s with DC a m p l i f i e r s a r e mounted in the r e a c t o r r o o m : one on the North side of the r e a c t o r at the external t h e r m a l c o l u m n ; one o v e r the fuel s t o r a g e pits; and one on the South wall.

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