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Journal Articles

Estimation method of prompt neutron decay constant reducing higher order mode effect by linear combination

Katano, Ryota

Nuclear Science and Engineering, 193(4), p.431 - 439, 2019/04

We proposed "linear combination method" to reduce the higher order mode effect on the prompt neutron decay constant measured by the pulsed neutron experiment. When the spatial higher order mode effect is taken into account, the time evolution of the neutron counts after the pulsed neutron injection is given by linear combination of multiple exponential functions. However, the measurement results by the conventional method include the systematic error derived from the higher order mode effect because the conventional method fit the neutron counts with a single exponential function. The proposed method extract the single exponential function of the fundamental mode by linear combination of the neutron counts at multiple detectors, thus the proposed method reduces the higher order mode effect. As the verification, we applied the proposed method to the numerical simulation. The results indicate that the proposed method can reduce the higher order mode effect by linear combination.

Journal Articles

On-line subcriticality measurement using a pulsed spallation neutron source

Iwamoto, Hiroki; Nishihara, Kenji; Yagi, Takahiro*; Pyeon, C.-H.*

Journal of Nuclear Science and Technology, 54(4), p.432 - 443, 2017/04

 Times Cited Count:4 Percentile:27.27(Nuclear Science & Technology)

Journal Articles

Kinetic parameter $$beta_{rm eff}/ell$$ measurement on low enriched uranyl nitrate solution with single unit cores (600$$phi$$, 280T, 800$$phi$$) of STACY

Tonoike, Kotaro; Miyoshi, Yoshinori; Kikuchi, Tsukasa*; Yamamoto, Toshihiro

Journal of Nuclear Science and Technology, 39(11), p.1227 - 1236, 2002/11

 Times Cited Count:17 Percentile:22.52(Nuclear Science & Technology)

Kinetic parameter $$beta_{rm eff}/ell$$ of low enriched uranyl nitrate solution was measured by the pulsed neutron source method in the STACY. This measurement was repeated systematically over several uranium concentrations from 193.7 gU/$$ell$$ to 432.1 gU/$$ell$$. Used core tanks were two cylindrical tanks whose diameters are 600 mm and 800 mm and one slab tank which has 280 mm thickness and 700 mm width. In this report, experimental data such as solution conditions, critical solution level for each solution condition, subcritical solution levels where measurements were conducted, measured decay time constants of prompt neutron and extrapolated $$beta_{rm eff}/ell$$ values are described as well as basic principle of the pulsed neutron source method. $$beta_{rm eff}/ell$$ values were evaluated also by computation with the diffusion code CITATION in SRAC and the nuclear data library JENDL 3.2. Both experimental and computational $$beta_{rm eff}/ell$$ values show good agreement.

Journal Articles

Measurement of control rod reactivity worth in axially heterogeneous fuel core (VHTRC-4) by PNS method

Akino, Fujiyoshi; Takeuchi, Motoyoshi; Ono, Toshihiko; Fujisaki, Shingo

PHYSOR 96: Int. Conf. on the Physics of Reactors, 2, p.E281 - E289, 1996/00

no abstracts in English

Journal Articles

Measurement of overall temperature coefficient of reactivity of VHTRC-1 core by pulsed neutron method

Yamane, Tsuyoshi; ; Akino, Fujiyoshi; Kaneko, Yoshihiko

Journal of Nuclear Science and Technology, 27(2), p.122 - 132, 1990/02

no abstracts in English

Journal Articles

Analysis of dieaway experiments in a uranium-238 sphere

Journal of Nuclear Science and Technology, 10(10), p.619 - 625, 1973/10

no abstracts in English

Oral presentation

Reactor physics experiments using transmutation physics experimental facility for research and development of accelerator-driven system

Iwamoto, Hiroki; Nishihara, Kenji; Sugawara, Takanori; Tsujimoto, Kazufumi; Sasa, Toshinobu; Maekawa, Fujio

no journal, , 

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