IAEA0913 SCENARIOS.

1. NAME OR DESIGNATION OF PROGRAM:  SCENARIOS.

3. DESCRIPTION OF PROGRAM OR FUNCTION

The SCENARIOS system is a straight-forward simulation model of the material flows through the  various process steps in the nuclear fuel cycle. The system was designed to accept as input the deployment programmes for the various reactor types under consideration and operational characteristics for each reactor type. These reactor programme data  are used together with fuel cycle strategy data describing the deployment of spent fuel reprocessing facilities, descriptive data on away-from-reactor (AFR) spent fuel storage facilities and data for lead times, delay times and material recovery efficiencies for each fuel cycle operation.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The SCENARIOS does no optimization and does not attempt to balance supply and demand of resources such as plutonium. The calculations are made in considerable detail but are simple. The fuelling characteristics of  reactors may be described in great detail if desired and considerable input data is required to describe the fuel cycle strategy. The combination of a simple calculation with no optimisation and considerable input data was chosen to allow for greater flexibility in the use of the system.

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM

The SCENARIOS code is designed to  accept the fuel cycle data for nuclear power plants in any degree of detail. This may vary from the simplest extreme of providing only steady-state reload and discharge data for model plants, to the other extreme of providing data for each batch of fuel loaded and discharged during the entire lifetime of each individual plant. For  most calculations, either extreme would be undesirable. The simple extreme would ignore initial loading requirements, the composition changes during the approach to steady-state, and the final core discharge at plant retirement. The other extreme, while providing all the necessary details, would require a burdensome amount of input data, and would introduce a high degree of precision into calculations which have a low degree of accuracy (due to the uncertain nature of forecasting).

8. RELATED AND AUXILIARY PROGRAMS

The SCENARIOS system consists of a
set of LIBRARIAN or Card Input files, computer programs and intermediate Disk Files. Each computer program is executed independently and generates either output reports, Disk Files for use by another program, or both. The system also utilises a computer program for modifying large input files, and the programs use an array structure which facilitates program mdification or extension.

10. REFERENCES:

- K.E. Cross and L.L. Bennett:
  The "SCENARIOS" System User's Information
  1980-09-01  (Draft)

11. MACHINE REQUIREMENTS:

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

          Kenneth E. Cross, Leonard L. Bennett
          I.A.E.A.
          P.O.B. 100, A-1400 Vienna
          Wegiemerstr. 5

report                   1980-09-01  (Draft)                        REPPT
object program   mag tape3 self-extracting .exe files for MS-DOS    OBJTP
report                   1980-09-01  (Draft)                        REPPT