Passive Cooldown Performance of Integral Pressurized Water Reactor

Shoubao Dai, Chunnan Jin, Jingfu Wang, Yuxiang Chen

NO.703 Research Institute of China Shipbuilding Industry Corporation, Harbin, China.

DOI: 10.4236/epe.2013.54B097                

Abstract

The design of an integral pressurized water reactor (IPWR) focuses on enhancing the safety and reliability of the reactor by incorporating a number of inherent safety features and engineered safety features. However, the characteristics of passive safety systems for the marine reactors are quiet different from those for the land nuclear power plant because of the more formidable and dangerous operation environments of them. This paper presents results of marine black out accident analyses. In the case of a transient, the passive residual heat removal system (PRHRS) is designed to cool the reactor coolant system (RCS) from a normal operation condition to a hot shutdown condition by a natural circulation, and the shutdown cooling system (SCS) is designed to cool the primary system from a hot shutdown condition to a refueling condition by a forced circulation. A realistic calculation has been carried out by using the RELAP5/MOD3.4 code and a sensitivity analysis has been performed to evaluate a passive cooldown capability. The results of the accident analyses show that the reactor coolant system and the passive residual heat removal system adequately remove the core decay heat by a natural circulation.

Keywords

An Integral Pressurized Water Reactor (IPWR); Passive Safety System; Styling; Natural Circulation

Conflicts of Interest

The authors declare no conflicts of interest.

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