MORSE/STORM: A generalized albedo option for Monte Carlo calculations

Technical Report · Sun Sep 01 04:00:00 EDT 1991

DOI:https://doi.org/10.2172/5017268· OSTI ID:5017268

Gomes, I C; Stevens, P N ^[1]

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1. Tennessee Univ., Knoxville, TN (United States)

The advisability of using the albedo procedure for the Monte Carlo solution of deep penetration shielding problems that have ducts and other penetrations has been investigated. 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 appropriately 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. Major modifications to MORSE/BREESE include an option to save for further use information that would be lost at the albedo event, an option to displace the point of emergence during an albedo event, and an option to use spatially dependent albedo data for both forward and adjoint calculations, which includes the point of emergence as a new random variable to be selected during an albedo event. The theoretical basis for using TORT-generated forward albedo information to produce adjuncton albedos was derived. The MORSE/STORM package was developed to perform both forward and adjoint modes of analysis using spatially dependent albedo data. Results obtained with MORSE/STORM for both forward and adjoint modes were compared with benchmark solutions. Excellent agreement and improved computational efficiency were achieved, demonstrating the full utilization of the albedo option in the MORSE code. 7 refs., 17 figs., 15 tabs.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5017268
• Report Number(s): ORNL/FEDC-91/1; ON: DE92002380
• Country of Publication: United States
• Language: English

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ALBEDO
BENCHMARKS
COMPUTER CODES
M CODES
MATERIALS
MODIFICATIONS
MONTE CARLO METHOD
RADIATION TRANSPORT
SHIELDING
THERMONUCLEAR REACTOR MATERIALS