t
4-7
..
-.
F
4d
--
I '
L
0- 122, 23 2
Th(n,y)---t
233
Th
Fig. 4.0-2a.
Nuclide Production Chain f o r 232Th.
L _-
I f
hi
L -
I
239Np(n, N 0p42,)y
b
0- 123.5111
-..
1 '
L
L
23*U(n,y)-239U
Fig. 4.0-2b.
Nucl i e Production Chain f o r 23%.
Consideration o f many o f t h e above f a c t o r s i s inherent i n t h e "mass balance" calculat i o n s presented i n t h i s chapter f o r the various reactors operating on a l t e r n a t e f u e l cycles.
It i s emphasized, however, t h a t i f a d e f i n i t e decision were made t o employ a s p e c i f i c a l t e r n a t e fuel c y c l e i n a s p e c i f i c reactor, t h e next step would be t o optimize the r e a c t o r design f o r t h a t p a r t i c u l a r cycle, as i s discussed i n Chapter 5. Optimization o f each r e a c t o r f o r t h e
L I
many f u e l s considered was beyond the scope o f t h i s study, however, and instead t h e design used f o r each r e a c t o r was t h e design f o r t h a t r e a c t o r ' s reference f u e l , regardless o f the f u e l c y c l e under consideration.
-
! *
rw --
t
u
f"
The reactors analyzed i n t h e c a l c u l a t i o n s are l i g h t - w a t e r thermal reactors; spectrals h i f t - c o n t r o l l e d thermal reactors; heavy-water thermal reactors; high-temperature gascooled thermal reactors; l i q u i d - m e t a l f a s t breeder reactors; and f a s t breeder reactors o f advanced o r a l t e r n a t e designs.