NEA-0057 CRAM-360.

CRAM-360, 1-D, 2-D Multi Group Diffusion with Keff Calculation or Criticality Search

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: CRAM-360.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
CRAM-360	NEA-0057/02	Tested	01-JAN-1969

Machines used:

Package ID	Orig. computer	Test computer
NEA-0057/02	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

The programme solves the multi- group diffusion equations in two dimensions (r-z, x-y, r-theta) and in one dimension (slab, cylindrical or spherical geometry).
It computes the k effective of the system, or alternatively it searches for criticality by varying material composition, or by varying the reactor buckling, or by moving spacial boundaries.
CRAM solves also source type problems.

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4. METHOD OF SOLUTION

A source iteration technique is used. On CRAM-360, some new features for timing, convergences etc. are added.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

     number of points in r direction    = 100
     number of points in z direction    = 100
     number of change vector            = 100
     number of isotopes                 = 1000
     number of materials                = 1000
     number of zones                    = 1000
     number of energy groups            = 100
     number of points times number of
     spectra in library data            = 1000.

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6. TYPICAL RUNNING TIME: 5 min./100 points/energy group.

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7. UNUSUAL FEATURES OF THE PROGRAM

There is a powerful general output routine, which is in fact a compiler. Output instructions are given in algebraic form, as part of the data to the programme. The user can easily direct the processing of results so that complicated summing and integrating of the results can be done.

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
NEA-0057/02	01-JAN-1969	Tested at NEADB

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10. REFERENCES

- A. Hassit:
A Computer Program to Solve the Multigroup Diffusion Equations
TRG Report 229(R), (March 1962).

NEA-0057/02, included references:

- B. McGregor, A.G. Richards and R.G.J. Wood:
An IBM 360 Version of the Neutron Diffusion code CRAM
AAEC/TM492 (Feb. 1968).

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11. HARDWARE REQUIREMENTS

MACHINE REQUIREMENTS. A 32k core storage is required

Following logical tape units are used

                            2  input
                            3  output
                            4  F.D. coefficients
                            5  flux 1
                            6  flux 2
                            7  chains
                            9  dump 1
                           10  dump 2

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0057/02	FORTRAN+ASSEMBLER

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: FORTRAN II monitor (IBM 7090/94).
IBM 360 Operating System.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

          A. Hassit
          UKAEA
          Central Technical Services
          Reactor Technology Branch
          Risley, Warrington

The library has received this programme through the CETIS
programmotheque.
IBM 360 version was offered by AUS-AEC (Australian Atomic Energy Commission Research Establishment, Australia).

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16. MATERIAL AVAILABLE

NEA-0057/02

File name	File description	Records
NEA0057_02.002	SOURCE 360/65	8599
NEA0057_02.003	OVERLAY CONTROL CARDS	100
NEA0057_02.004	DATA	341
NEA0057_02.005	OUTPUT	3503

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17. CATEGORIES

C. Static Design Studies

Keywords: criticality, cylinders, diffusion equations, iterative methods, multigroup, one-dimensional, r-theta, r-z, slabs, spheres, two-dimensional, x-y.