Exploitable results
The scope of the PARSOAR project was to perform a state of art on catalytic recombiners and to provide a handbook guide of implementing these devices in existing as well as future nuclear power plants.
The main results achieved are the followings:
- According to the workgroup members, the catalytic recombiner can be regarded as the most suitable hydrogen hazard mitigation strategy for nuclear power plants because of its passive behaviour, its well-known physical phenomenology, its efficiency under both beyond-design-basis and design-basis accident conditions, its start-up at low hydrogen concentration, and its simple use without supplementary constraints in normal operation.
- Whereas the qualification of catalytic recombiners as well as the numerical modelling of their behaviour under accident conditions can be regarded as globally achieved now, some complementary qualification tests could be performed as describes as follows.
- A well-balanced approach for implementing a hydrogen hazard mitigation system based on catalytic recombiners in a nuclear power plant may be constituted by two main phases: a first stage composed of a global hydrogen risk analysis, and a second step devoted to the hydrogen mitigation system design and the implementation process of the catalytic recombiners.
Such a work allows to identify some research areas to be considered for future in terms of experimental PAR-qualification and simulation by numerical codes that should be the subject of complementary research in the frame of a European hydrogen network of excellence.
It is therefore recommended that future experimental tests and numerical modelling should concentrate on the remaining issues of:
- Lowering of existing uncertainties about hydrogen sources as core re-flood or the reactions between boron carbide and steam or uranium and steam.
- Completing the experimental qualification of catalytic recombiners (DBA conditions for BWR, specific poisons, ignition tests and realistic source-term in BDBA conditions) and understanding or simulating their behaviour under specific accident conditions.
- Qualification of three-dimensional computer codes with adapted experimental facilities and instrumentation.
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