Abstract
Integrated reactor structural design makes the pressure vessel itself and loads more complicated, so stress concentration makes strength failure easier at reactor coolant pump nozzle. The general purpose finite element program ANSYS/ WORKBENCH was used for 3D stress and fatigue analysis and the results of the evaluation are based on RCC-M criteria. The integrated reactor structural design is evaluated to demonstrate with applicable criteria and ANSYS/WORK- BENCH has better operability than ANSYS APDL on stress analysis of reactor pressure vessel.
Highlights
Integrated reactor is new generation pressurized water reactor developed by China [1]
Fixed boundary condition A is set in the bottom of the vessel; symmetry boundary condition B is set on the section of symmetrical structure of the reactor pressure vessel; hydrostatic pressure C and F are set on the upper section of reactor pressure vessel and reactor coolant pump nozzle; the mechanical loads D and E caused by self-weight and earthquake load are set on the upper section of the reactor coolant pump nozzle; the internal pressure G is set on the inner surface of all parts as shown in the Figure 2
According to RCC-M, stress is divided into primary membrane stress, secondary membrane stress and bending stress to be evaluated
Summary
Integrated reactor is new generation pressurized water reactor developed by China [1]. Reactor structure is highly integrated, for example, once through steam generator placed in a pressure vessel; reactor coolant pump is placed on the pressure vessel nozzles; pressure vessel fixed and supported the main pump, control rod drive mechanism and the top of the heap structure. This structural design can simplify a loop system and eliminate LBLOCA, but makes the pressure vessel itself and loads more complicated. Most domestic researchers [2,3,4,5] using traditional ANSYS APDL for stress analysis and evaluation of reactor pressure vessel calculation.
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