Abstract
Characteristics governing a marine reactor operation include: (1) occurrence of abrupt load changes in association with maneuvering operations; (2) subjection to ship motion such as rolling, heaving and piching. The effects of abrupt load changes appear on the reactor primary system as well as on the secondary steam generator. However, the effects of ship motion appear only on the steam generator since enough subcooling is given to primary coolant and no steam void is found in the primary coolant. This paper contains the following subjects: (1) description of the part of the reactor system which has an intimate relation to reactor operation; (2) description of the functions of the control system and the safety system; (3) transient behaviour of the reactor and the steam generator under load change; (4) transient behaviour of the steam generator due to ship motion.
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