IAEA0820 BLAST.

BLAST, Accident Conditions in Critical and Subcritical Thermal Reactor System

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, TYPICAL RUNNING TIME, FEATURES, AUXILIARIES, STATUS, REFERENCES, MACHINE 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: BLAST.

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2. COMPUTERS

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Program name	Package id	Status	Status date
BLAST	IAEA0820/01	Tested	01-DEC-1973

Machines used:

Package ID	Orig. computer	Test computer
IAEA0820/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

BLAST has been developed to study accident conditions in critical and subcritical thermal multiplying systems. The programme computes the time behaviour of the thermal neutron density and the system temperature following a step change in reactivity. The integrated thermal neutron density is also computed, from which the total number of fissions during an excursion may be obtained.

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4. METHOD OF SOLUTION

The computational method consists of computing the neutron flux over short time intervals during which the reactivity is considered to be constant. The fact that the reactivity does change during such time intervals is duly corrected for. The temperature rise during this time interval is calculated from the average neutron flux during the time interval, and the reactivity change due to the temperature coefficients of the system is calculated. The process is then repeated.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME

The average time per step is about 1.25 seconds for the sample problem.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
IAEA0820/01	01-DEC-1973	Tested at NEADB

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10. REFERENCES

IAEA0820/01, included references:

- R. Van der Walt and J.G. Mohr:
  The Time Dependence of the Neutron Flux and Temperature of a
  Thermal Multiplying System Following a Step Change in Reactivity
  PEL-152 (May 1967) and Errata.

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11. MACHINE REQUIREMENTS: 128k bytes of storage.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA0820/01	FORTRAN-IV

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

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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

                 O. G. P. Grosskopf
                 South African Atomic Energy Board
                 Private Bag 256
                 Pelindaba, Pretoria, South Africa

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16. MATERIAL AVAILABLE

IAEA0820/01