NESC0576 GEM-NESC.

1. NAME OR DESIGNATION OF PROGRAM:  GEM-NESC.

3. DESCRIPTION OF PROBLEM OR FUNCTION

GEM is used to predict fuel cycle costs for any type nuclear system (i.e., BWR, HTGR, PWR, LMFBR, GCFR, . . . ). The current version is limited to thermal reactors. GEM is designed for production use by large utilities which have several reactor types on their system. GEM has been written so as to accommodate all major fuel management activities undertaken by a utility -
   (1)  fuel bid analysis,
   (2)  evaluation of actual day to day operation, and
   (3)  system simulation and optimization studies.

4. METHOD OF SOLUTION

Costs are calculated using present-worth techniques and continuous compounding. The equations are based on an investor-owned utility capitalization structure which easily covers  the range of industrial, private, and public (government) owned utilities. Three distinct types of analysis (cashflow, allocated costs, yearly cashflow) are performed, each yielding identical results. Using these as a basis many other analyses are undertaken.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Dimensions of all arrays are carried as variables throughout the analysis. The maximum size of each array is set by the user in program MAIN.
Current values are set so that maxima are -
    50 batches per case study
    20 year batch life
    30 year case study
   120 batch burn time-steps
20 individual payments (sales) associated with each cost        component

6. TYPICAL RUNNING TIME:  1/3 second per batch is required.

7. UNUSUAL FEATURES OF THE PROGRAM

GEM
(1) is broken into three major sections - input, general  economic analysis, and output. The last two sections are  able to perform an economic analysis of any type reactor  system to any desired degree of precision. The input section  converts data specific to a reactor type into a general form  acceptable to the last two sections. The current input         sections available handle BWR, PWR, and HTGR.
   (2)  uses continuous compounding.
(3) contains three distinct types of economic analysis - cash-         flow, allocated cost, and yearly cashflow.
(4) calculates fuel cycle cost on a batch, year, case,         cumulative batchwise, and cumulative yearwise basis.
(5) has separate escalation routines available for each type of         cost component.
   (6)  accepts Pu and U recycle bids.

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES

- D.F. Hang, Fuel Cycle Economics, Education and Research in the
  Nuclear Fuel Cycle, pp. 67-83, 1972.
- J.A. Hughes and D.F. Hang, Development of Engineering Economic
  Basis to Analyze Nuclear Fuel Cycle Costs, Transactions  of
  American Nuclear Society Annual Meeting, pp. 48-50, June 1972.

- J.A. Hughes and D.F. Hang:
  Program GEM, General Economic Model to Analyze Nuclear Fuel Cycle
  Costs
  University of Illinois Nuclear Engineering Program Report,
  (September 1973).

11. MACHINE REQUIREMENTS

274K  bytes (202K  with overlay  structure)
and one non-system disk (or tape)

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

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

                 J. A. Hughes and D. F. Hang
                 University of Illinois
                 217 Nuclear Engineering Laboratory
                 Urbana, Illinois  61801

File name	File description	Records
NESC0576_01.001	SOURCE PROGRAM (F4)	4479
NESC0576_01.002	SAMPLE CASE DATA	431
NESC0576_01.003	JCL	10
NESC0576_01.004	SAMPLE CASE PRINTED OUTPUT	3245