Program to solve the multigroup discrete ordinates transport equation in (x,y,z) geometry

Technical Report · Thu Apr 01 00:00:00 EST 1976

DOI:https://doi.org/10.2172/7348297· OSTI ID:7348297

Lathrop, K D

Numerical formulations and programming algorithms are given for the THREETRAN computer program which solves the discrete ordinates, multigroup transport equation in (x,y,z) geometry. An efficient, flexible, and general data-handling strategy is derived to make use of three hierarchies of storage: small core memory, large core memory, and disk file. Data management, input instructions, and sample problem output are described. A six-group, S/sub 4/, 18 502 mesh point, 2 800 zone, k/sub eff/ calculation of the ZPPR-4 critical assembly required 144 min of CDC-7600 time to execute to a convergence tolerance of 5 x 10/sup -4/ and gave results in good qualitative agreement with experiment and other calculations. 6 references

• Research Organization: Los Alamos Scientific Lab., N.Mex. (USA)
• Sponsoring Organization: Not Available; USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7348297
• Report Number(s): LA-6333-MS
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
CDC COMPUTERS
COMPUTER CODES
COMPUTERS
EQUATIONS
KINETICS
MULTIGROUP THEORY
NEUTRON TRANSPORT THEORY
Nuclear Criticality Safety Program (NCSP)
REACTOR KINETICS
REACTOR KINETICS EQUATIONS
T CODES
THREE-DIMENSIONAL CALCULATIONS
TRANSPORT THEORY