The interpretation of neutron noise in boiling water reactors

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Nucl. Sci. Eng.; (United States)

OSTI ID:6353237

John, T M; Singh, O P

Some qualitative results of neutron noise in a boiling water reactor (BWR) are reported. By using one-group theory, it has been shown that the neutron flux fluctuations caused by a distributed source in space, representative of the coolant boiling noise in BWRs, can be considered as made up of two components: The first one, having a global character, is a quickly varying function of frequency and follows the fundamental mode solution in space; the second, called nonglobal (local), follows the spatial variation of noise-source intensity distribution and is independent of frequency for < el , where el is the speed of neutrons and is the effective removal (production minus absorption) cross section. For >el , this component decreases with increasing frequency. The formulation indicates that the global component is quite sensitive to the neutron multiplication factor of the system and, for the local component, the medium behaves like a nonmultiplying one. The global effect is dominant at lower frequencies in a critical system, and the local effect is dominant at higher fre quencies.

• Research Organization: Reactor Research Centre, Reactor Physics Section, Tamil Nadu
• OSTI ID: 6353237
• Journal Information: Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 89:4; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

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Boiling Water Cooled
BWR TYPE REACTORS
COOLANTS
CROSS SECTIONS
FREQUENCY DEPENDENCE
KINETICS
MULTIPLICATION FACTORS
NEUTRON FLUX
NEUTRON TRANSPORT THEORY
ONE-GROUP THEORY
RADIATION FLUX
REACTOR KINETICS
REACTOR NOISE
REACTORS
RESOLUTION
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TRANSPORT THEORY
WATER COOLED REACTORS
WATER MODERATED REACTORS