Reduced Delayed Neutron Group Representations

Technical Report · Wed Apr 01 04:00:00 EST 1959

DOI:https://doi.org/10.2172/1962418· OSTI ID:1962418

Skinner, R. E. ^[1]; Cohen, E. R. ^[1]

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1. North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.

It has been shown that a two delayed neutron group model will accurately represent the asymptotic behavior of the reactor transfer function. Correspondingly, the requirement that this asymptotic behavior be accurately represented is sufficient to completely specify the two delayed neutron group constants. Further, a three delayed neutron group model has been evolved which is designed to represent both the asymptotic behavior of the transfer function and shutdown behavior. The inhour equation, transfer function, and transient behavior for step inputs of reactivity with and without reactivity feedback loops for the two and three delayed neutron group representations are compared with those given by the standard one-group treatments. Important consequences of such reduced group representations are savings in machine time in making kinetic studies and the increased tractibility of the reactor kinetic equations.

• Research Organization: North American Aviation, Inc., Canoga Park, CA (United States). Atomics International Div.
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• DOE Contract Number: AT(11-1)-GEN-8
• OSTI ID: 1962418
• Report Number(s): NAA-SR--3204
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS