Design And Research On Supported Method Of The ADS Reactor Vessels

Accelerator-driven sub-critical clean nuclear energy system(ADS)reactor contains a large amount of radioactive materials.As a pressure boundary in the loop,the main vessel can prevent radioactive materials from leaking into the external environment.As the key core equipment in the reactor,the main vessel needs to ensure the integrity,functionality and safety of its structure under various loads such as gravity load,thermal load and seismic load,which is beneficial to the safe operation of the reactor.It's very important.Different support modes directly affect the stress distribution of the main vessel.Therefore,the design and research of the support modes of the main vessel is of great significance to the safety of the fast reactor structure.The reactor mainly has two different support methods:hanging type and seat type.In the choice of pressure vessel support mode,scholars from various countries have carried out related research.At present,the industrialized countries in Europe,America,Japan and other industrialized countries use the fast reactors as the hanging structure,and the Chinese experimental fast reactors adopt the seat support method.The existing research results are mainly carried out on the pool type fast reactor container,and the research results are not fully applicable to the lead-based ADS stack target coupling system.The existing support method for the design of the lead-based stack target coupling system is the hanging type.On this basis,the seismic calculation and evaluation work is completed,and the feasibility of the ADS container hanging support method is verified.In the research on the support mode of the pool type fast reactor,most of them prove that the seat type support method has improved the seismic performance compared with the hanging type.In view of the fact that there is no relevant research on the design of the ADS container seat support method,it is of great significance to design the ADS container seat support method.In this paper,the ANSYS finite element software is used to model the ADS stack target coupling structure under the seat support mode.Based on the static model,the support design to reduce the thermal stress is proposed.The support method of the slip support is proposed for the target body,and the main container is supported.The weak structure of the transition section of the lower head and the central pipe is optimized.The spectral analysis method is used to calculate the seismic resistance of the ADS main container under the seat support mode,and the ASME code is used to evaluate the stress,and the feasibility of the seat support scheme design is verified.Finally,compared with the thermal stress and seismic performance of the ADS main container in the hanging and seat type,it is known that the seat type support method is more advantageous.