ACP100 is a small modular reactor which is a new type Integral Pressurized Water Reactor with the third generation of nuclear power technology level. ACP100 reactor doesn't have the primary coolant pipes because the primary pumps are installed at pump junctions of pressure vessel, and the steam generators are installed in pressure vessel. The internals structures are different from the traditional PWRs. The 1:2 scale testing of ACP100 reactor internals have been done. The vibration responses of major internal components have been measured. The preliminary FIV fatigue evaluations of major internal components have been done according to test results. The major components have been checked after 50 hours endurance test at rated operating condition.
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