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A Simple method for estimating the structure temperatures and the cesium revaporization inside the reactor pressure vessel, 1; Basic concepts and model descriptions for the Fukushima Daiichi Nuclear Power Plant

Liu, Q.; Ishikawa, Jun ; Maruyama, Yu ; Watanabe, Norio

This paper presents a simple approach for estimating the temperature of the structures in the reactor pressure vessel (RPV) and the release rates of fission products (FPs) at the time of several months after the core melt accident at the Fukushima Daiichi Nuclear Power Plant. In this paper, basic concepts are firstly presented and then, a heat balance model is proposed to estimate the temperature of the uncovered reactor core and the upper structures in the RPV with the measured temperatures of the RPV outer wall. In addition, models for estimating the revaporization rate of cesium hydroxide (CsOH) inside the RPV and the leak rate of CsOH to the primary containment vessel are also presented. This approach is anticipated to be applicable to the Fukushima Daiichi #1, #2 and #3 Units.

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Category:Nuclear Science & Technology

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