Nuclear Production of Hydrogen, Fourth Information Exchange ...

PROPOSED CHEMICAL PLANT INITIATED ACCIDENT SCENARIOS IN A S-I CYCLE PLANT COUPLED TO A PEBBLE BED MODULAR REACTOR
Figure 12: Extent of reaction in Section 3 for area = 0.02 m 2 break
Figure 13: Extent of reaction in Section 3 for area = 0.02 m 2 break
Conclusions
It is evident that important transient scenarios can be initiated by the chemical plant side of a coupled
nuclear thermochemical hydrogen generation scheme. The first step to understanding these potential
accident scenarios is proposing the scenarios and investigating through qualitative reasoning and
later modelling.
This paper presents seven potential accident scenarios in two categories. The categories are
dubbed as: i) discontinuous reactor accidents; ii) reaction chamber rupture events. Brief qualitative
descriptions and analyses of these accident scenarios are presented. Additionally, a scheme is
proposed for modelling scenarios where a reaction chamber rupture is present.
Additional work must be performed regarding the efficacy and specific applicability of these
scenarios. Limiting factors should be identified, and more specific examples of these scenarios must be
established. Parametric studies of these limiting factors must be performed. Essential to the modelling
of these scenarios is an S-I cycle flow sheet which has been properly scaled-up to an industrial scope.
This is in contrast to the current flow sheets, which are for bench scale type experiments (Brown, 2003).
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