The nuclear reactor system thermal-hydraulic codes are extensively used in the safety analysis and in licensing. They have reached a good maturity towards end of 1990 and progress was slower in the last twenty years. Some deficiencies are identified by users and new issues may be raised for new applications. Also new advanced simulation tools exist which may be used as a support in multi-scale analysis, and multiphysics simulation include coupling with neutronics and fuel behaviour codes. Considering the current level of research and development in system thermal-hydraulics, international knowledge and information exchanges may help finding common solutions by sharing our experiences. The FONESYS network of system code developers has been created to strengthen the current technology, share recent advances, and discuss further ways of improvements. Recently the CONUSAF network has been also launched to gather the code users and some expert code developers, to enhance interactions between them in view of identifying further code limitations and capabilities, analyzing and addressing issues raised by the users and promoting common R&D efforts on topics of high relevance. This paper lists the system thermal-hydraulics and safety topics addressed in these two networks including identification of phenomena, scaling experiments, modeling, validation, uncertainty quantification, code application, advanced modeling and multi-scale analysis. New needs are identified related to new reactor designs, passive systems, new safety requirements, and to the reduction of the uncertainties. Activities are suggested to answer these needs within FONESYS and CONUSAF networks.
Remaining issues in system thermal-hydraulics – How the FONESYS and CONUSAF networks can help finding solutions?
D’Auria F.
Co-primo
Conceptualization
;
2019-01-01
Abstract
The nuclear reactor system thermal-hydraulic codes are extensively used in the safety analysis and in licensing. They have reached a good maturity towards end of 1990 and progress was slower in the last twenty years. Some deficiencies are identified by users and new issues may be raised for new applications. Also new advanced simulation tools exist which may be used as a support in multi-scale analysis, and multiphysics simulation include coupling with neutronics and fuel behaviour codes. Considering the current level of research and development in system thermal-hydraulics, international knowledge and information exchanges may help finding common solutions by sharing our experiences. The FONESYS network of system code developers has been created to strengthen the current technology, share recent advances, and discuss further ways of improvements. Recently the CONUSAF network has been also launched to gather the code users and some expert code developers, to enhance interactions between them in view of identifying further code limitations and capabilities, analyzing and addressing issues raised by the users and promoting common R&D efforts on topics of high relevance. This paper lists the system thermal-hydraulics and safety topics addressed in these two networks including identification of phenomena, scaling experiments, modeling, validation, uncertainty quantification, code application, advanced modeling and multi-scale analysis. New needs are identified related to new reactor designs, passive systems, new safety requirements, and to the reduction of the uncertainties. Activities are suggested to answer these needs within FONESYS and CONUSAF networks.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
