专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明公开

EP3896703A1 COMPUTER-BASED SIMULATION METHODS FOR BOILING WATER REACTORS (BWR) 审中-公开
公开(公告)号：EP3896703A1
公开(公告)日：2021-10-20
申请号：EP20169335.5
申请日：2020-04-14
申请人： Westinghouse Electric Sweden AB , ETH Zurich
发明人： LE CORRE, Jean-Marie , PRASSER, Horst-Michael , ROBERS, Lukas
IPC分类号： G21C3/326 , G21C17/022 , G21D3/00
摘要： A computer-implemented simulation method of predicting local concentrations of constituents in coolant water anywhere along fuel rods within any fuel assembly mechanical design of a Boiling Water Reactor (BWR) potentially resulting in crud deposits on said fuel rods. The method is based on a sub-channel approach of predicting local mass fluxes of vapour and liquid in coolant water anywhere along fuel rods within any fuel assembly mechanical design of a Boiling Water Reactor (BWR) for given steady-state or transient boundary conditions. The sub-channel approach is based on the solution of mass, momentum and energy conservation equations for the vapour phase and the liquid phase, the liquid phase is represented by more than one field variable, and is specifically represented by three fields, with the vapour phase as a fourth field, consisting of droplets, a liquid base film, and disturbance waves. The method comprises:
- simulating steady-state or transient boundary conditions, such as inlet coolant water flow into said sub-channels, the coolant water flow may have a predetermined flow velocity variation,
- analysing predefined parameters of said disturbance waves and base film, including wave velocity, wave frequency and base film thickness, and
- analysing liquid base film thickness between consecutive passing disturbance waves, to calculate local instantaneous impurity concentrations based on said simulated boundary conditions, the calculation is made for each fuel rod of the fuel assembly, wherein, for each fuel rod, the method further comprises comparing said calculated local instantaneous impurity concentration to a crud compound precipitation limit, and during the time said concentration is higher than said precipitation limit, crud is considered to have occurred. In a related simulation method also base film dryout, clad temperature increase, and drop entrainment from waves, may be determined.

2. 发明公开

EP4235698A2 COMPUTER-BASED SIMULATION METHODS FOR BOILING WATER REACTORS (BWR) 审中-实审
公开(公告)号：EP4235698A2
公开(公告)日：2023-08-30
申请号：EP23178211.1
申请日：2020-04-14
申请人： Westinghouse Electric Sweden AB
发明人： LE CORRE, Jean-Marie , PRASSER, Horst-Michael , ROBERS, Lukas
IPC分类号： G21D3/00
摘要： A computer-implemented simulation method, based on a sub-channel approach of predicting local mass fluxes of vapour and liquid in coolant water anywhere along fuel rods within any fuel assembly mechanical design of a Boiling Water Reactor, (BWR), for given steady-state or transient boundary conditions, the sub-channel approach is based on the solution of mass, momentum and energy conservation equations for the vapour phase and the liquid phase, the liquid phase is represented by more than one field variable, and is specifically represented by three fields, with the vapour phase as a fourth field, consisting of droplets, a liquid base film, and disturbance waves, the method comprises solving individual mass, momentum and energy conservation equations, for said four fields, and solving the necessary closure relations describing the transfer of mass between the said fields, completed by models describing local phenomena including one or many of base film dryout, clad temperature increase, or drop entrainment from waves, wherein the method further comprises:
- simulating steady-state or transient boundary conditions, including any postulated scenarios relevant to BWR operation with respect to the potential appearance and rewetting of dry patches between waves, associated dry time and clad temperature increase, and
- analysing predefined parameters of said disturbance waves and liquid base film, including wave velocity and frequency, and base film thickness.

3. 发明公开

EP4235698A3 COMPUTER-BASED SIMULATION METHODS FOR BOILING WATER REACTORS (BWR) 审中-实审
公开(公告)号：EP4235698A3
公开(公告)日：2023-10-18
申请号：EP23178211.1
申请日：2020-04-14
申请人： Westinghouse Electric Sweden AB
发明人： LE CORRE, Jean-Marie , PRASSER, Horst-Michael , ROBERS, Lukas
IPC分类号： G21C3/326 , G21C17/022 , G21D3/00
摘要： A computer-implemented simulation method, based on a sub-channel approach of predicting local mass fluxes of vapour and liquid in coolant water anywhere along fuel rods within any fuel assembly mechanical design of a Boiling Water Reactor, (BWR), for given steady-state or transient boundary conditions, the sub-channel approach is based on the solution of mass, momentum and energy conservation equations for the vapour phase and the liquid phase, the liquid phase is represented by more than one field variable, and is specifically represented by three fields, with the vapour phase as a fourth field, consisting of droplets, a liquid base film, and disturbance waves, the method comprises solving individual mass, momentum and energy conservation equations, for said four fields, and solving the necessary closure relations describing the transfer of mass between the said fields, completed by models describing local phenomena including one or many of base film dryout, clad temperature increase, or drop entrainment from waves, wherein the method further comprises:
- simulating steady-state or transient boundary conditions, including any postulated scenarios relevant to BWR operation with respect to the potential appearance and rewetting of dry patches between waves, associated dry time and clad temperature increase, and
- analysing predefined parameters of said disturbance waves and liquid base film, including wave velocity and frequency, and base film thickness.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式