NEA-0664 DCHAIN-2.

1. NAME OR DESIGNATION OF PROGRAM:  DCHAIN. A computer code for calculation of transmutation of nuclides.

3. DESCRIPTION OF PROBLEM OR FUNCTION

DCHAIN analyzes radioactive growth and decay of nuclides by one-point approximation.

4. METHOD OF SOLUTION

The code constructs the decay scheme of each nuclide in the code and breaks it up into linear chains. Accumulation of the nuclide by each linear chain is calculated analytically by the Bateman method and the total accumulation is obtained as the summation of solutions for linear chains.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The core memory size MXX for the variable dimensions is limited to 100 K and the total necessary core memory size is 128 K for the accumulation calculation by the present version of the code.

DEDIT routine
     MXX = NNUM* (NFIS = 4* NPAR + 9)
           + ISC* (NGS + 1) + 10* (NCARD + 1),

where, MXX = necessary core memory size for variable dimension              variables,
      NNUM = number of nuclides in the nuclear data library,
NCARD = number of cards to revise the nuclear data library,  NGS = number of groups for neutron reaction cross sections              (27),
NFIS = number of kinds of fission yields (10),  NPAR = the maximum number of the direct mother nuclides              allowed for each nuclide (6),
ISC = number of nuclides having neutron reaction cross              sections (100).

FPDH routine
       MXX = NMAX* (17 + 4*NPAR + NFIS)
             + LCH* (6 + 2*NCHA) + ISC* (1 + NGS + NIRR)
             + NIRR* (10 + NFIS) + NGS + NOUT* 5,

where,NMAX = number of nuclides considered in the calculation,  NPAR = the maximum number of the direct mother nuclides              allowed for each nuclide,
      NFIS = number of kinds of fission yields,
      LCHA = the limitation for the length of a linear chain,
NCHA = the maximum allowable number of linear chains allowed              for the calculation of accumulation of each nuclide,
NIRR = number of time steps for expressing the irradiation and              cooling history,
NOUT = the maximum number of time points for the output of              results.

6. TYPICAL RUNNING TIME

Running time was 180 s for calculating accumulations of 1170 fission products for 1 irradiation-history time step and 32 output times by using a FACOM 230-75 computer which requires about double CPU time compared with a CDC 6600.

Running time is approximately proportional to number of nuclides, irradiation time steps and output times. It depends also upon complication of the decay scheme. The running time was tripled by considering neutron capture transformations in fission products.
NEA-DB executed the test case on IBM 3033 in 3 seconds.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

FPGAM code can calculate a gamma- ray spectrum of nuclides of which accumulations were calculated by DCHAIN. FPGAM can take the response function of a gamma-ray detector into consideration.

DCHAIN supersedes the FP-S code and enables linearization of any type of decay schemes.

10. REFERENCES

- K. Tasaka:
  "DCHAIN - Code for Analysis of Build-up and Decay of Nuclides"
  JAERI 1250 (1977).
- K. Tasaka:
  "Nuclear Data Library of Fission Products for Decay Power
  Calculation"
  NUREG/CR-0705, TREE-1325 (1979).
- K. Tasaka:
  "Computer Program FPGAM for Calculating Gamma-Ray Spectrum of
  Fission Products
  JAERI-M 6898 (1977).

- K. Tasaka:
  DCHAIN2 - A Computer Code for Calculation of Transmutation of
  Nuclides
  JAERI-M 8727 (1980).
- H. Ihara et al.:
  PROFP-Y - A Computer Code for Producing Nuclear Data Library of
  Fission Products
  JAERI-M 9714 (1981)
- K. Tasaka:
  DCHAIN2 - A Computer Code for Calculation of Transmutation of
  Nuclides
  JAERI-M 8727 (1980).
- H. Ihara et al.:
  PROFP-Y - A Computer Code for Producing Nuclear Data Library of
  Fission Products
  JAERI-M 9714 (1981)

11. MACHINE REQUIREMENTS:  300 kbytes of main storage on IBM 3033.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
OS370/033 VS2 03.8G (IBM 3033).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHOR

          Japan Atomic Energy Research Institute
          Tokai-mura
          Naka-gun
          Ibaraki-ken
          Japan

File name	File description	Records
NEA0664_01.001	DCHAIN INFORMATION FILE	56
NEA0664_01.002	DCHAIN, SOURCE CARD IMAGES (FORTRAN-4)	1806
NEA0664_01.003	SETB99, SOURCE CARD IMAGES (ASSEMBLER)	82
NEA0664_01.004	LIBRARY CONVERSION PROGRAM, SOURCE	74
NEA0664_01.005	LIBRARY DATA (BCD)	3688
NEA0664_01.006	DCHAIN, INPUT DATA FOR SAMPLE CASE	32
NEA0664_01.007	DCHAIN, OUTPUT OF SAMPLE CASE	2966
NEA0664_01.008	DCHAIN, JCL TO RUN SAMPLE CASE	101

File name	File description	Records
NEA0664_03.001	Information file	92
NEA0664_03.002	Batch file to compile and link	15
NEA0664_03.003	Binary data library	0
NEA0664_03.004	Sample 1 input data	12
NEA0664_03.005	Sample 2 input data	19
NEA0664_03.006	Sample 3 input data	14
NEA0664_03.007	Sample 4 input data	14
NEA0664_03.008	DCHAINLI.FOR Source file	78
NEA0664_03.009	DCHMAIN Source file	198
NEA0664_03.010	DCHT source file	215
NEA0664_03.011	DEDIT Source file	345
NEA0664_03.012	FN Source file	124
NEA0664_03.013	FPDH Source file	430
NEA0664_03.014	FYCI Source file	45
NEA0664_03.015	INPUT Source file	74
NEA0664_03.016	ONPWR Source file	164
NEA0664_03.017	OUTPUT Source file	69
NEA0664_03.018	Input file to create DCHLIB.BIN	3688
NEA0664_03.019	Output on logical unit 12	30
NEA0664_03.020	Sample 1 output data	1480
NEA0664_03.021	Sample 2 output data	169
NEA0664_03.022	Sample 3 output data	62
NEA0664_03.023	Sample 4 output data	107
NEA0664_03.024	DOS file-names	23