A generalized albedo option for forward and adjoint Monte Carlo calculations

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

OSTI ID:7183187

Gomes, I C

The advisability of using the albedo procedure for the Monte Carlo solution of deep-penetration shielding problems which have ducts and other penetrations is investigated. It is generally accepted that the use of albedo data can dramatically improve the computational efficiency of certain Monte Carlo calculations - however the accuracy of these results may be unacceptable because of lost information during the albedo event and serious errors in the available differential albedo data. This study was done to evaluate and appropriate modify the MORSE/BREESE package, to develop new methods for generating the required albedo data, and to extend the adjoint capability to the albedo-modified calculations. The major modifications include an option to save for further use information that would be lost at the albedo event, an option to displace the emergent point during an albedo event, and an option to read spatially-dependent albedo data for both forward and adjoint calculations - which includes the emergent point as a new random variable to be selected during an albedo reflection event. The theoretical basis for using TORT-generated forward albedo information to produce adjuncton albedos is derived.

• Research Organization: Tennessee Univ., Knoxville, TN (United States)
• OSTI ID: 7183187
• Country of Publication: United States
• Language: English

Related Subjects

663620* -- Physics of Radiations Other Than Neutrons-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ADJOINT FLUX
ALBEDO
COMPUTER CODES
DUCTS
M CODES
MONTE CARLO METHOD
NEUTRON FLUX
RADIATION FLUX
SHIELDING