CP1000, improved from 2nd generation nuclear power plant technology, is a new concept of 2nd plus technology, some improvements of which are relatively mature. Based on the technology of 2nd plus, two new design improvements are being implemented, substituting high pressure safety injection with middle pressure safety injection and adding a function of fast cooling when an accident happens. Using code RELAP5, this article calculated and analyzed SGTR accident in order to evaluate the impact of the two improvements.

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