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Conference Agenda

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Session Overview

Session

Keynote 1

Time:

Tuesday, 02/Sept/2025:

9:00am - 10:00am

Session Chair: Hyoung Kyu Cho, Seoul National University, Korea, Republic of (South Korea)
Session Chair: Dominique Bestion, Consultant, France

Location: Session Room 1 - #205 (2F)

Presentations

ID: 3089 / Keynote 1: 1
Invited Paper
Keywords: Passive system, thermal hydraulics, ROSA-AP600, PCCS, computer codes

Personal Experiences in the Two Kinds of Experiments to Confirm Reliability of Passive Systems for Nuclear Reactors

Hideo Nakamura

Japan Atomic Energy Agency, Japan

Passive systems (PSs), both for reactor driving system and safety features, are currently significantly discussed because they will surely take an important role in the coming reactor designs including small modular reactors (SMRs), irrespective of water-cooled or non-water-cooled ones. Great many kinds of developmental effort are underway including the confirmation of their performances especially in the reactor safety aspects. While PSs should have many favorable points, their stability and thus reliability have been discussed with some concerns because of their small driving force especially in the coolant injection capability to maintain integrity of nuclear fuels under any kinds of accidents. This paper revisits two past efforts: ROSA-AP600 and passive containment cooling system (PCCS) horizontal heat exchanger for advanced boiling water reactor (ABWR) containment vessel under severe accident conditions, thus reactor system response and component performances of PSs, to consider key thermal-hydraulic capabilities assessed to assure the reliability in such a practical use of PSs.