A New convention for the epithermal neutron spectrum for improving accuracy of resonance integrals

Harada, Hideo; Takayama, Naoki; Komeda, Masao

Journal of Physics Communications (Internet), 4(8), p.085004_1 - 085004_17, 2020/08

https://doi.org/10.1088/2399-6528/aba735

A new convention of epithermal neutron spectrum is formulated for improving accuracy of resonance integrals. The new type function is proposed as an approximating function of epithermal neutron spectrum based on calculations by the state-of-art Monte Carlo code MVP-3. Bias effects on determination of resonance integrals due to utilizing approximating functions of the traditional types and the new type are compared. The other bias effect is also investigated, which is caused by neglecting position dependence of a neutron spectrum inside an irradiation capsule. For demonstrating the bias effects due to these assumptions on neutron spectrum quantitatively in a practical case, the thermal neutron-capture cross section and resonance integral of Cs measured at a research reactor JRR-3 are re-evaluated. A superior property of the proposed new convention is discussed. The experimental method is proposed to determine the new shape factor introduced in the convention by a combinational use of triple flux monitors (Au, Co and Zr), and its analytical methodology is formulated.

Effect of fuel grain size on reactivity

Okuno, Hiroshi; Naito, Yoshitaka; Sakurai, Y.*

Journal of Nuclear Science and Technology, 28(10), p.958 - 960, 1991/10

https://doi.org/10.3327/jnst.28.958

no abstracts in English

Effects of UO-fuel grain size on reactivity; Study by ultra-fine energy group calculations using the computer codes based on the collision probability method

Okuno, Hiroshi; *

JAERI-M 91-107, 49 Pages, 1991/08

JAERI-M-91-107.pdf:1.09MB

no abstracts in English

Revised SRAC code system

; ; *; *

JAERI 1302, 281 Pages, 1986/09

JAERI-1302.pdf:8.78MB

no abstracts in English