A New measuring method for elemental ratio and Vickers hardness of metal-oxide-boride materials based on Laser-Induced Breakdown Spectroscopy (LIBS)

Abe, Yuta; Otaka, Masahiko; Okazaki, Kodai*; Kawakami, Tomohiko*; Nakagiri, Toshio

Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 7 Pages, 2019/05

Since the hardness of fuel debris containing boride from BC pellet in control rod is estimated to be two times higher as that of oxide, such as UO and ZrO, it is necessary to select the efficient and appropriate operation for removal of fuel debris formed in the severe accident of nuclear power plants. We focused on the characteristics of LIBS, an innovative rapid chemical in-situ analysis technology that enables simultaneous detection of B, O, and other metal elements in fuel debris. Simulated solidified melt specimens were obtained in the plasma heating tests (CMMR-0/-2, performed by JAEA) of simulated fuel assembly (ZrO is used to simulated UO pellet, other materials such as stainless steel, BC are same as fuel assembly). The LIBS signals of (B/O)/Zr ratio showed good linear relationship with Vickers hardness. This technique can be also applied as in-situ assessment tool for elemental composition and Vickers hardness of metal-oxide-boride materials.

Examination of measurement method of the hardness by Laser Induced Breakdown Spectroscopy (LIBS)

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Sato, Ikken

no journal, , 

no abstracts in English

Study on measurement technique for ZrBx composition and hardness based on Laser Induced Breakdown Spectroscopy (LIBS), 2; Measurement characteristic on different composite specimens

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Oishi, Yuji*

no journal, , 

no abstracts in English

Applicability of metal boride hardness measurement using Laser-Induced Breakdown Spectroscopy (LIBS), 2; Element distribution of metal boride specimens with complicated composition

Okazaki, Kodai*; Kawakami, Tomohiko*; Nagayama, Sakiko*; Abe, Yuta; Otaka, Masahiko; Makuuchi, Etsuyo*; Oishi, Yuji*; Takagai, Yoshitaka*

no journal, , 

no abstracts in English

Analytical study of multipoint LIBS using multivariate analysis

Kawakami, Tomohiko*; Nagayama, Sakiko*; Yokota, Hiromi; Abe, Yuta; Otaka, Masahiko; Fujimoto, Katsushige*; Takagai, Yoshitaka*

no journal, , 

no abstracts in English

元素分析方法

阿部 雄太

not registered

JP, 2018-200792  Patent licensing information

【課題】測定対象元素の特性X線に対応するピークと干渉元素の特性X線に対応するピークとが干渉する場合に、測定対象元素の組成を高精度で算出する。 【解決手段】解析部は、ZR(干渉元素)の発する特性X線のうち、Bに起因する測定対象ピークと干渉しないものに対応する波長(参照用波長)を設定し、上記の測定点におけるこの参照用波長での強度(補正用強度)も測定する。測定対象ピーク(BのKα1線)に対応する波長λ1周囲においては、測定対象ピークP11がある。この測定対象ピークP11に近接して、ZRのMZ線のピーク(干渉ピーク)P21が存在する。補正用強度測定工程においては、参照用波長λ2として、ZRのLα線のピーク(参照用ピークP41)に対応する波長が設定される。測定点におけるB組成のみを反映するI11(補正後強度)は、実測強度I31から補正用強度I41に補正係数Cを乗じた値を減じた式で表すことができる。