Technology development to predict dose rate distribution in PCV of Fukushima Daiichi Nuclear Power Station

Riyana, E. S.; Okumura, Keisuke

no journal, , 

A technology to predict the most probable dose rate distribution in the primary containment vessel (PCV) of the Fukushima Daiichi Nuclear Power Station (1F) have been developed by combined use of sophisticated theoretical calculation and local measurement results. It was applied to the Unit-1 of 1F.

OECD/NEA International Joint Research Project regarding fuel debris characterization PreADES & TCOFF

Nakayoshi, Akira; Washiya, Tadahiro; Kurata, Masaki; Yano, Kimihiko; Nagae, Yuji; Osaka, Masahiko; Ogino, Hideki

no journal, , 

Laser remote analysis for in-core and in-situ monitoring of debris in decommissioning of Fukushina Daiichi Nuclear Power Station

Wakaida, Ikuo; Oba, Hironori; Akaoka, Katsuaki; Oba, Masaki; Miyabe, Masabumi; Matsumoto, Ayumu

no journal, , 

Radiation resistant optical fiber based laser induced breakdown spectroscopy (Fiber LIBS) is developed for in-core and in-situ elemental analysis of debris and its activity is performed under severe environmental conditions such as high radiation field of about 10 kGy/h and under water. Long pulse laser, microwave assisted LIBS for more high sensitivity and liquid sample application are also introduced. Long-pulse laser with the pulse duration about 100 ns will be introduced to compensate the delivery power loss and/or to enhance the emission signal. microwave assisted LIBS technique coupled with simple antenna for the combination use with fiber LIBS will be under developing, and about ten times enhancement was observed under the atmosphere condition. For the application to the liquid phase sample, especially for the analysis of the polluted cooling water, the thin-sheet liquid jets will be also introduced as the convenience and high sensitive monitoring for dissolved elements of nuclear fuel debris.