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IAEA0820 BLAST.

BLAST, Accident Conditions in Critical and Subcritical Thermal Reactor System

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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
File name File description Records
IAEA0820_01.001 SOURCE PROGRAM (FORTRAN) 302
IAEA0820_01.002 SAMPLE PROBLEM 18
IAEA0820_01.003 OUTPUT LIST OF SAMPLE PROBLEM 306
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17. CATEGORIES
  • E. Space-Independent Kinetics
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: accidents, excursions, kinetics, reactivity, temperature coefficient, thermal neutrons.