Abstract:
Based on the natural safety advantages of underground nuclear reactors such as the bounding rock and soil, considering depressurization cavern, isolation gate, filtration and venting system, and compared with that of the normal ground NPPs, the large release frequency（LRF） for underground NPPs is analyzed with probabilistic safety assessment（PSA） method. Analysis results show that the LRF of underground NPPs is at least two orders of magnitude lower than that of the ground NPPs, so the goal of practical elimination of large release by design could be realized.
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