ORIGEN: the ORNL isotope generation and depletion code
Abstract
i o n code which solves t h e equations of r a d i o a c t i v e growth and decay f o r l a r g e numbers of isotopes with a r b i t r a r y coupling.The code uses t h e matrix exponential method t o solve a l a r g e system of coupled, l i n e a r , f i r s t -o r d e r ordinary d i f f e r e n t i a l equations with constant coeff i c i e n t s .The genera:L n a t u r e of t h e matrix exponential method permits t h e treatment of complex decay and transmutation schemes.An extensive l i b r a r y of nuclear d a t a has been compiled, including h a l f -l i v e s and decay schemes, neutron absorption c r o s s s e c t i o n s , f i s s i o n y i e l d s , d i s i n t e g r a t i o n e n e r g i e s , and multigroup photon r e l e a s e d a t a .ORIGEN has been used t o compute t h e compositions and r a d i o a c t i v i t y of :fission products, cladding m a t e r i a l s , and f u e l m a t e r i a l s i n LWR:;, LMFBRs, MSBRs, and H E R S .The applicat i o n s a r e i l l u s t r a t e d with c a l c u l a t e d i n v e n t o r i e s and r a d i a t i o n l e v e l s f o r spent f u e l i r r a d i a t e d t o a burnup of 33,000 MWd/metric t o n i n a PWR spectrum..
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