Study on Response and Consequence of Loss of Coolant Accident in Integrated Small Reactor

The overall analytic model including the core, primary loop and containment was established base on RELAP5 code to fully analyze the Loss of Coolant Accident (LOCA) for the integrated small modular reactor (or small reactor for short). The transient response of the core and containment as well as the radiological consequence for the environment were calculated and analyzed. The results showed that the accident consequences met the acceptance criteria stipulated in the small reactor safety review principle. Besides, the improved scheme of close-fitting containment and the optional parameter configuration were proposed. The calculation results show that with the improved scheme, the pressure balance of the primary loop and containment can be achieved very shortly and the break flow is terminated earlier, so the loss of primary coolant and the radiological release are reduced. The core safety is enhanced, and the dose consequence of the accident is decreased. Meanwhile, the long-term cooling of containment can be ensured by the pool outside the containment. The research results can provide references for the engineering application and containment design of the integrated small reactor.