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Neutron noise measurements in the YALINA-Booster experiments

Berglöf, Carl (author)
KTH,Reaktorfysik
Fernández-Ordóñez, M. (author)
Villamarín, D. (author)
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Bécares, V. (author)
González-Romero, E. M. (author)
Bournos, V. (author)
Serafimovich, I. (author)
Mazanik, S. (author)
Kiyavitskaya, H. (author)
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 (creator_code:org_t)
International Atomic Energy Agency, 2009
2009
English.
In: Proceedings of International Topical Meeting on Nuclear Research Applications and Utilization of Accelerators. - : International Atomic Energy Agency. - 9789201504104
  • Conference paper (peer-reviewed)
Abstract Subject headings
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  • In addition to the pulsed neutron source measurements and the continuous source beam-trip and current-to-flux measurements performed in the YALINA-Booster facility, also presented in this conference, a set of neutron noise measurements has been performed to achieve a complete characterization of the core. The neutron noise measurements have been performed in three different configurations covering a subcriticality range from 0.85 to 0.977. The Rossi-α neutron noise technique has been applied to detector counts from two channels in the thermal part of the core. The Rossi-α results are compared to the experimental prompt neutron decay constants obtained from the pulsed neutron source measurements. A first approach fitting procedure reveals a need of three exponentials to describe the Rossi-α histograms. It has been found that at deep subcriticality, the fundamental mode decay may coincide with or be close to a higher eigenmode, thus making it difficult to determine the prompt neutron decay constant correctly.

Subject headings

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Keyword

Detector counts
Eigen modes
Exponentials
Fitting procedure
Flux measurements
Fundamental modes
Neutron noise
Prompt neutron decay constant
Pulsed neutron sources
Subcriticality
Two channel
Neutron emission
Neutron sources
Nuclear engineering
Reactivity (nuclear)
Acoustic noise measurement

Publication and Content Type

ref (subject category)
kon (subject category)

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