Measurement of large negative reactivity of an accelerator-driven system in the Kyoto University Critical Assembly

Autor:	Masahiro Kawasaki, Kengo Hashimoto, Atsushi Sakon, Cheol Ho Pyeon, Muhamad Aiman Bin Maarof, Takahiro Yagi, Tadafumi Sano, Takaaki Ohsawa, Wataru Sugiyama
Rok vydání:	2013
Předmět:	Nuclear physics Physics Pulse repetition frequency Nuclear and High Energy Physics Range (particle radiation) Nuclear Energy and Engineering Astrophysics::High Energy Astrophysical Phenomena Multiple integral Neutron cross section Spectral density Neutron source Neutron Exponential decay
Zdroj:	Journal of Nuclear Science and Technology. 51:116-126
ISSN:	1881-1248 0022-3131
Popis:	Large negative reactivity of a subcritical system driven by a pulsed 14 MeV neutron source has been measured in the Kyoto University Critical Assembly. The subcriticality of the accelerator-driven system (ADS) ranged in effective multiplication factor roughly from 0.98 to 0.92, which corresponded to an operational range of an actual ADS proposed by Japan Atomic Energy Agency. As the measurement technique, pulsed neutron method, power spectral analysis for pulsed neutron source, accelerator-beam trip method were employed. From neutron count decay data obtained by the pulsed neutron experiment, not only the prompt-neutron decay constant of fundamental mode but also a higher spatial mode could be derived. The subcriticality was also determined from the fundamental decay constant. The measured cross-power spectral density consisted of a familiar correlated reactor-noise component and many uncorrelated delta-function-like peaks at the integral multiple of pulse repetition frequency. The fundamental prompt-neut...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1399d6e346040f17f8f9fc5e7a8689ef https://doi.org/10.1080/00223131.2013.852488 Zobrazit plný text záznamu