Advanced Containment Systems for Next-Gen Water Reactors

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System and component testing For most advanced reactor concepts it is necessary to demonstrate that engineering solutions can meet all their functional requirements. As an example, the AP-600 passive safety systems test programme is briefly described. The AP-600 passive safety systems test programme: A major portion of this test programme [34] is devoted to the study of the passive containment cooling system (PCCS). The aim of the tests that have been performed, or are in progress, is to demonstrate the heat removal capability of the containment design and to get more detailed information about: water film behaviour and wetting of steel containment outer surface, heat transfer by evaporation of water from the steel containment surface and heat transfer by air cooling, hydraulic pressure drop in the flow paths of the air for external containment cooling, condensation heat transfer on inclined cooled surfaces inside the containment in the presence of non-condensable gases.

For coping with SGTR, isolation valves on the feed water and steam lines are proposed. Designs are also discussed where secondary side heat removal is performed by a safety condenser, no longer providing an extra barrier to fission product release to the environment. 48 6. 1. OVERALL CONSIDERATIONS Before presenting some examples of the next generation of advanced containment systems, it is of interest to identify a few considerations related to the overall integrated concepts not yet mentioned in the previous sections.

The objectives are in general to identify and to obtain a better understanding of the problems related to the integrity of the containment system, modelling, material characterization and failure modes in order to evaluate the safety margins of the structures. In particular the response of the containment under severe accident conditions has to be researched: Assessment of structural failure of concrete due to thermal stress, decomposition, etc. Leak rate assessment, during pressure increase, Investigations on refractory materials to protect concrete against molten core attack, Source term assessment.

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