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In fission products in used nuclear fuel, there are several stable isotopes that have a large neutron absorption effect. For evaluation of the neutronics characteristics of a nuclear reactor, the amount of such isotopes should be evaluated by using burn-up calculation codes. To confirm the correctness of such data obtained by calculation codes, it is important to assure the precision of the evaluation of the neutron multiplication factor of used nuclear fuel. However, it is known that there are several hardly measurable elements in such important fission products. Data for the amounts of the hardly measurable elements in used nuclear fuel are scarce worldwide.
The Japan Atomic Energy Agency (JAEA) had been developing a method to assess the amounts of these fission products that are hardly measurable and have a large neutron capture cross section, under the auspices of the Japan Nuclear Energy Safety Organization. In this work, a measurement method was developed combining a simple and effective chemical separation scheme of fission products from used nuclear fuel and an inductively coupled plasma mass spectrometry with high sensitivity and high precision. This method was applied to the measurement program for the used BWR 9 × 9 fuel assembly. This measurement method is applicable to the required measurements for countermeasures to the accident at the Fukushima Dai-ichi Nuclear Power Plant of Tokyo Electric Power Company (TEPCO). JAEA has a measurement plan for not only BWR but also PWR fuel.
This presentation describes the measurement method developed in the study as well as the future measurement plan in JAEA.
Ito M, Fukaya Y, Ueno T et al (2011) Isotopic composition measurement of FP nuclides in spent LWR UO 2 fuel and nucleonic analyses  measurement of FP nuclides. In: Proceedings of the 2011 annual meeting of the Atomic Energy Society of Japan, Fukui-shi, Japan
Suzuki M, Yamamoto T, Nakajima T et al (2012) Isotopic composition measurement of FP nuclides in spent LWR UO 2 fuel and nucleonic analyses : Nucleonic analysis of metallic FP isotopes. In: Proceedings of the 2012 fall meeting of the Atomic Energy Society of Japan, Higashi-Hiroshima-shi, Japan
SFCOMPO - Spent Fuel Isotopic Composition Database, http://www.oecd-nea.org/sfcompo/, OECD/NEA
Fukaya H, Suyama K, Sonoda T, Okubo K, Umeda M, Uchiyama G (2013) Examination of measurement method of isotopic composition of fission products in spent fuel. JAEA-Research 2013-020, Japan Atomic Energy Agency [in Japanese]
Suzuki M, Yamamoto T, Fukaya H, Suyama K, Uchiyama G (2013) Lattice physics analysis of measured isotopic compositions of irradiated BWR 9 × 9 UO 2 fuel. J Nucl Sci Technol 50(12):1161–1176 CrossRef
JAEA R&D Review 2013, http://jolisfukyu.tokai-sc.jaea.go.jp/fukyu/mirai-en/2013/, Japan Atomic Energy Agency (2013)
Uchiyama G, Fukaya H, Suyama K, Ito M, Ueno T, Miyata S, Sonoda T, Usami H, Kawasaki Y, Sakadume Y, Kurosawa T, Tonoike K, Inagawa J, Umeda M, Magara M, Watanabe K, Shinohara N (2012) Development of quantitative analytical method of U, Pu and fission products in spent fuels by combined-chromatographic-mass-spectrometric-isotopic-dilution technology. In: Proceedings of ENC 2012, Manchester
- Development of the Method to Assay Barely Measurable Elements in Spent Nuclear Fuel and Application to BWR 9 × 9 Fuel
- Springer Japan
- Chapter 6
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