SPAN-4. A Point-Kernel Shield Evaluation Code
- Bettis Atomic Power Lab., West Mifflin, PA, (United States)
SPAN4 calculates the fast neutron dose rate, thermal neutron flux, gamma-ray flux, dose rate, and energy-absorption rate in rectangular, cylindrical, and spherical geometries by integrating appropriate exponential kernels over a source distribution. The shield configuration is flexible, a first-level shield mesh, using any one of the three geometries, is specified. Regions of this same geometry or of other geometries, having their own (finer) meshes, may then be embedded between the first-level mesh lines, defining second-level shield meshes. This process is telescopic, third-level shield meshes may be embedded between second-level meshlines in turn. All meshes may have variable spacing. Sources and detectors may be located arbitrarily with respect to any shield mesh. The source is defined by the function: s=s0+s1(a)*s2(b)*s3(c)+s4(a,b)*s3(c)+s5(a,c)*s2(b)+s6(b,c) *s1(a)+s7(a,b,c), where a, b, and c represent coordinates. If any factor is missing, the corresponding terms are zero.
- Research Organization:
- Bettis Atomic Power Lab., West Mifflin, PA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Nuclear Energy, Washington, DC (United States)
- DOE Contract Number:
- AC11-89PN38014
- OSTI ID:
- 138995
- Report Number(s):
- ESTSC-000193C660000; NESC-462
- Resource Relation:
- Other Information: DN: SPAN4 is structured into distinct parts which are loaded into central memory as required. These parts are referred to as overlays as described in reference 5. Essentially an overlay represents the amount of program text in central memory. With overlay loading, the main overlay is always in memory, and,in addition, a particular primary and one secondary overlay may also be in central memory. SPAN4 contains a main overlay, 7 primary overlays, and 8 secondary overlays. Overall program control is vested in the main overlay and the primary and secondary overlays are loaded and executed through the use of the NEXT subroutine described in reference 3.; PBD: 16 Mar 1992
- Country of Publication:
- United States
- Language:
- English
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