Performance evaluation of a resonance ionization mass spectrometer developed for the FFDL system of fast reactors

Figures & data

Figure 1. Gas tagging method employed in the prototype fast breeder reactor Monju. This figure is a modified form of a figure in [1].

Figure 2. Resonance ionization schemes of Kr and Xe used in this study.

Figure 3. Nuclear reactions involving the tag gas nuclides during fuel burnup.

Table 1. Definitions of terms used in time-dependent differential equations (1)–(5).

Notation	Definition
11	^78Kr
21, 22, 23, 24	^80Kr, ^79Br, ^79Kr, ^79Se
31, 32, 33	^82Kr, ^82Br, ^81Br
41, 42	^126Xe, ^126I
51, 52, 53, 54	^129Xe, ^129Cs, ^129mXe, ^129I
55, 56, 57	^128Te, ^128Xe, ^127I
f, p	Fuel, gas plenum section
n	Fuel element
N	Number of atoms
vi ≡ Vi/(Vf + Vp)	Relative volume (i = f, p)
σ	Neutron absorption cross section
ϕ	Neutron flux
y	Fission yield
λ	Decay constant

Figure 4. Simulated distributions of measured ⁷⁸Kr/⁸⁰Kr isotope ratios for initial ratios of 0.20 and 0.25. See text for the simulation conditions.

Figure 5. Simulated distributions of measured ¹²⁶Xe/¹²⁹Xe isotope ratios for initial ratios of 0.020 and 0.025. See text for the simulation conditions.

Figure 6. Simulated distributions of measured ⁸²Kr/⁸⁰Kr isotope ratios for initial ratios of 5.0 and 9.0. See text for the simulation conditions.

Figure 7. Effects of fuel burnup on simulated distributions of measured ⁸²Kr/⁸⁰Kr isotope ratios. See text for the simulation conditions.

Figure 8. Overview of the experimental set-up. This figure is a modified version of an earlier figure appearing in [2].

Figure 9. Example of the noise subtraction procedure.

Figure 10. Correction of systematic errors caused by isotope shifts.

Figure 11. Evaluation of statistical errors in ⁷⁸Kr/⁸⁰Kr and ¹²⁶Xe/¹²⁹Xe as functions of measurement time.

Iwata Y, Harano H, Ito C, Aoyama T. Upgrade of the resonance ionization mass spectrometer for precise identification of failed fuel in a fast reactor. In: AIP Conference Proceedings; 2011 Jun 12–18; Crete, Greece. Vol. 1412; p. 295–302.

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Iwata Y, Ito C, Harano H, Aoyama T. Improvement of the resonance ionization mass spectrometer performance for precise isotope analysis of krypton and xenon at the ppt level in argon. Int J Mass Spectrom. 2010;296:15–20.

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