NESC0453 RICE

1. NAME OR DESIGNATION OF PROGRAM:  RICE

3. DESCRIPTION OF PROBLEM OR FUNCTION

The  program   calculates  an
energy  exchange matrix  which describes  the  probability that  a
neutron with energy E will produce a  recoil atom with energy T in
a  given material.   In addition,  the program  can calculate  the
primary recoil atom energy spectrum  for a given neutron spectrum,
the damage  cross section for the  material, and an  optimum lower
energy limit for use in comparing the relative damage in different
reactor  spectra.  The  program  accepts  neutron scattering  data
directly  from the  ENDF/B library  tapes and,  in the  case of  a
resonance nuclide, from  a tape generated by  the program SUPERTOG
(NESC Abstract 431).

4. METHOD OF SOLUTION

The energy transfer matrix is obtained from a
solution  of  the  two-body  kinematic  equations.   The  solution
incorporates  information on  anisotropic  elastic scattering  and
inelastic scattering available from ENDF/B.  Damage cross sections
and primary  recoil spectra are  obtained by combining  the energy
transfer matrix  with suitable  secondary displacement  models and
neutron flux spectra.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

RICE   does    not
recognize  all of  the  multiplicity of  data  formats allowed  by
ENDF/B.  It  is programmed to  accept the most  prevalent formats.
In addition,  the neutron energy  distribution is restricted  to a
99-group representation and the recoil energies are represented by
200 energy groups.

6. TYPICAL RUNNING TIME:  All  options  for one  element  require  10
minutes.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

RICE  lacks  the   capability  of
calculating  elastic  scattering  cross  sections  from  resonance
parameters.   The code  SUPERTOG  can be  used  to produce  smooth
elastic  scattering  cross  sections  for   RICE  in  cases  where
resonance  parameters  are  included  in  the  ENDF/B  data.   The
multigroup  programs  GAM-II, ANISN,  and  XSDRN  can be  used  to
produce neutron spectra for use in RICE.

10. REFERENCE:

- J.D. Jenkins:
  RICE, A Program to Calculate Primary Recoil Atom Spectra from
  ENDF/B Data
  ORNL-TM-2706 (February 16, 1970).

11. MACHINE REQUIREMENTS

110,000 words of core  storage and five I/O
devices other than normal input/output

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

                 J. D. Jenkins
                 Oak Ridge National Laboratory
                 P. O. Box Y
                 Oak Ridge, Tennessee  37830

File name	File description	Records
NESC0453_01.001	SOURCE PROGRAMME	3138
NESC0453_01.002	JCL+SAMPLE INPUT	83
NESC0453_01.003	LIBRARY DATA (ENDF/B,MAT=1024)	943
NESC0453_01.004	PUNCHED OUTPUT	36
NESC0453_01.005	PRINTED OUTPUT	3467