Glass - Back to the Future!

Presenting Author:
Yoshiyuki Miura

article posted 07 April 2016

Yoshiyuki Miura March 2009 Graduated from graduate school of engineering, Hokkaido University
April 2009 Entered Japan Nuclear Fuel Limited
From 2009 to 2016 Engaged in development of new glass melter and new glass formulation

Study for composition dependence of chemical durability of high waste loading simulated HLLW glass

Yoshiyuki Miura*, Hideaki Tanaka, Satoshi Yuuki, Haruka Tada, Satoshi Komamine and Norio Kanehira
Research and Development Dept., Engineering Center, Reprocessing Business Division, Japan Nuclear Fuel Limited, Aomori 039-3212, Japan

The basic research programs for the next generation vitrification technology, which are commissioned project from Ministry of Economy, Trade and Industry of Japan to IHI Corporation (IHI), Japan Nuclear Fuel Limited (JNFL), Japan Atomic Energy Agency (JAEA) and Central Research Institute of Electric Power Industry (CRIEPI), have been implemented from 2014 for developing the advanced vitrification technology of low level wastes and high level liquid wastes (HLLW). In these programs, the developmental works such as the high waste loading glass, the alternate glasses of current borosilicate glasses including glass-ceramics and the minor actinide adsorbent glasses have been entrusted with the above organizations (shown in Fig. 1). JNFL is primarily concerned with the high waste loading glass focused on solubility of molybdenum which may cause the formation of undesirable secondary phase (yellow phase) in the case of HLLW vitrification. JNFL have collaborated with Akita University, University of Shiga Prefecture and Tokyo Institute of Technology to study the above programs. Furthermore, JNFL have uniquely investigated the effects of several constituents to keep a good chemical durability with high waste loading, which are conflicting with each other, of simulated HLLW glasses. This paper describes primarily the latter investigation results.

In this investigation, the soda-lime alumino-borosilicate glass was used in accordance with the actual HLLW glass compositions. The effects of concentration of each network modifiers (Li, Na, Ca) and intermediates (Al, Zn) on chemical durability with high waste loading have been investigated. As a result, the degree of effects have been varied with the above constituents on chemical durability with each waste loading factor (example shown in Fig. 2), which should be able to provide the guidelines of optimum components of high waste loading glasses.

These research programs will be planned to continue until 2018.

Fig. 1. The framework of IHI, JNFL, JAEA and CRIEPI in development of vitrification technology of HLLW.

Fig. 2. Normalized dissolution rate of B as a function of ZnO concentration obtained through PCT-A test method.