Abstract
In a pressurized-water reactor(PWR) nuclear power plant, adjusting the boron concentration through Chemistry and Volume Control System(RCV) is an important assistant method to compensate for reactivity changes, and the coolant boron concentration has a very important impact on the design of Reactor Boron and Water Makeup System(RBM) and Boron Recycle System(ZBR). Therefore, the boric acid circulation study on RCV is very important for optimizing system and the equipment design for RBM and ZBR designers. In this paper, the transient work conditions and computing method on load following mode have been collated, and the accuracy of the calculation method has been tested on a PWR nuclear power plant in normal operation. A boric acid circulation analysis has been conducted on the new design of PWR units under construction, and the analysis results can provide a reference for the RBM and ZBR design. The main study results are as follows: The refueling cycle and burn up level have a great influence on the calculation results; The calculation method under load follow mode has been improved, and the accuracy of the results has increased by fifteen percent; The demineralized water tanks volume design largely depends on the boron concentration when the boron removal demineralizer begins to work; Due to the increase of core thermal power, the increase of the boron concentration in the primary loop and the lengthening of the reactor refueling period, the equipment volumes in the new design of power plants are larger than that of the operating plant. In order to improve the calculation accuracy and reduce manual burden, this paper uses Fortran to program and calculate.
