Improvement of the PALLAS discrete-ordinates transport code

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · Nucl. Sci. Eng.; (United States)

OSTI ID:5688143

Sasamoto, N ^[1]; Takeuchi, K

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1. Japan Atomic Energy Research Inst., Tokai

An improvement in the approximation of the spatial distribution of the source term in the PALLAS discrete-ordinates code by a combination of linear and exponential functions results in a reduction of numerical errors compared with those due to the use of only a linear approximation based on a direct integration method. The results obtained by the improved approximation for one-dimensional radiation transport calculations are compared with those by the PALLAS code with the original linear approximation and by the S/sub N/ code ANISN. For further verification, this improved approximation is applied to two-dimensional neutron transport calculations, in which numerical errors due to the spatial mesh sizes used in the calculations are studied. As a result, it is found that the use of the improved approximation gives reasonable solutions with small numerical errors, irrespective of the spatial mesh size in both one- and two-dimensional PALLAS calculations of radiation transport.

• OSTI ID: 5688143
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 71:3; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
654003 -- Radiation & Shielding Physics-- Neutron Interactions with Matter
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPUTER CODES
DISCRETE ORDINATE METHOD
MODIFICATIONS
NEUTRAL-PARTICLE TRANSPORT
NEUTRON TRANSPORT
P CODES
RADIATION TRANSPORT
SHIELDING