HANARO, an open-tank-in-pool type research reactor of 30 MWth power in Korea, has been operating normally since its initial criticality in February, 1995. For the last ten years, HANARO has carried out ten years periodic in-service inspections (ISI as below) in accordance with Article IWD in ASME SEC. XI to verify the mechanical and structural integrities of the pressure retaining components of the safety related systems and the integral attachments of the supports and restraints of the components which are NPS 4 and above, to be within a specified boundary. This paper describes the results of the ISI including a system pressure test and a VT-3 visual inspection. From the results, it was confirmed through the ISI that the pressure retaining components and parts were stable to within the specified boundaries for their mechanical and structural integrities.

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