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A design-specific assessment of the effects of the impact of a large commercial aircraft and military aircraft on NPP facilities has been performed in accordance with 10 CFR Part 52. The velocity of a large commercial aircraft and a military aircraft for the aircraft impact assessment can be considered as 150 m/sec and 215 m/sec, respectively.
Both single shell and double shell structures have been applied to protect the NPP facilities from aircraft impact. The outer wall has been strengthened to make the structure safe against aircraft impact.
Two distinct types of structural failure modes including local failure and global collapse have been evaluated in regard to the reactor containment building and the spent fuel pool. Local failures are caused by impact of the aircraft engines and are largely independent of the global behavior characteristics of the impacted structure. Three main evaluations have been performed in regard to the design of NPP facilities against aircraft impact including a local analysis, a global analysis and a vibration analysis.
External fires caused by aircraft impacts are of relatively short duration and will not have a significant impact on systems necessary to provide cooling to the fuel in the reactor vessel or to the spent fuel pool. This assumption is based on an abundance of oxygen available to support combustion of the fuel and ready access to firefighting equipment. Despite this assumption, however, the duration of a potential fire as accorded in the Standard Review Plan 9.5.1, has been conservatively applied to guarantee structural safety.
Deformed Shape (Global Behavior) example images
Following the terror attack on New York’s World Trade Center in 2001, Korea assessed the safety of operating NPPs against aircraft impact and confirmed the safety of structures. The evaluation methods applied to APR1400, as well as the plant’s structural integrity, have also been confirmed. In case of APR1400, both single shell and double shell structures have been applied to protect the nuclear facilities from aircraft impact, with the safety of each assessed via an evaluation procedure
Aircraft Impact Locations example images