Visualization of internal structures of reactor core in the HTTR; Proposal of non-destructive inspection by cosmic-ray muon radiography

Takamatsu, Kuniyoshi

Hokeikyo Nyusu, (56), p.2 - 4, 2015/10

http://www.irm.or.jp/news56.pdf

Licensable Patent Information Database

Patent publication (In Japanese)

In our study, we focused on a nondestructive inspection method by cosmic-ray muons which could be used to observe the internal reactor from outside the RPV and the CV. We conducted an observation test on the HTTR to evaluate the applicability of the method to the internal visualization of a reactor. We also analytically evaluated the resolution of existing muon telescopes to assess their suitability for the HTTR observation, and were able to detect the major structures of the HTTR based on the distribution of the surface densities calculated from the coincidences measured by the telescopes. Our findings suggested that existing muon telescopes could be used for muon observation of the internal reactor from outside the RPV and CV.

内部状態解析方法およびプログラム並びに内部状態解析装置

高松 邦吉

田中 宏幸*

JP, 2010-166333  Patent licensing information  Patent publication (In Japanese)

【課題】所定の高透過性を有する粒子である高透過性粒子の性質を用いて構造物の内部状態をより適正に解析する。 【解決手段】構造物の内部の一部に相当し且つ水平角φ,仰角θE,通過点αのミュー粒子が通過する通過パーツJについて、通過長L[J,φ,θE,α]と仮定物質MAS[J]の密度ρ[J]との積としての密度長DL[J,φ,θE,α]を計算すると共に(S150)、計算した密度長DL[J,φ,θE,α]を用いてガウス分布を設定し(S160)、設定したガウス分布を用いてミュー粒子の散乱角θSC[J,φ,θE,α]を設定し(S170)、設定した散乱角θSC[J,φ,θE,α]を用いて通過パーツJの状態を解析する(S180)。