Doctoral Dissertations

Abstract

"An analytical model is developed to account for the photoneutron sources present in a beryllium reflector. The time-dependent, two- dimensional and three energy-group diffusion equations are written with an additional photoneutron source term. Then an approximate flux composed of two spatial shapes chosen beforehand, each having an unknown time coefficient, is inserted into time-dependent multigroup equations and the weighted residual criterion is applied. This yielded multimode kinetics equations with generalized definitions for conventional matrix parameters: generation time, reactivity, delayed neutron and delayed photoneutron fraction matrices.

Two transients are analyzed for the University of Missouri Research Reactor: simulation of rod drop experiment and rod withdrawal accident. For the first transient the effect of photoneutrons is found to be negligible. For the second case the photoneutron effect, though small, tends to slow down the transient. This study suggests that a space-dependent analysis is necessary to analyze both the transients"--Abstract, page ii.

Advisor(s)

Edwards, D. R.

Committee Member(s)

Dolan, Thomas J.
Bolon, Albert E., 1939-2006
Richards, Earl F., 1923-
Culp, Archie W., Jr.

Department(s)

Nuclear Engineering and Radiation Science

Degree Name

Ph. D. in Nuclear Engineering

Publisher

University of Missouri--Rolla

Publication Date

1975

Pagination

ix, 155 pages

Note about bibliography

Includes bibliographical references (pages 56-57).

Rights

© 1975 Safdar Ahmad Ali, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 3055

Print OCLC #

6013468

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