HITACHI'S ACTIVITY IN THE JOINT STUDY ON THERMAL UTILIZATION OF THE DOUBLE MS BWR: A MODULAR SIMPLIFIED & MEDIUM SMALL REACTOR
4th International Technical Meeting on Small Reactors - 2016 Nov. 02-04


Presented at:
4th International Technical Meeting on Small Reactors
2016 Nov. 02-04
Location:
Ottawa, ON Canada
Session Title:
Parallel Session E – Water-Cooled SMRs

Authors:
T. Ikegawa (Hitachi, Ltd.)
K. Kito (Hitachi, Ltd.)
K. Nishida (Hitachi-GE Nuclear Energy, Ltd.)
  

Abstract

A concept design of the DMS (Double MS: Modular Simplified & Medium Small Reactor) has been developed by Hitachi-GE Nuclear Energy Ltd. (Hitachi-GE) under the sponsorship of the Japan Atomic Power Company. The DMS is an innovative 300-400MWe class, small-to-medium sized boiling water reactor (BWR), which, based only on electricity generation, has been predicted to overcome almost all economy of scale concerns when compared to proven conventional advanced BWR (ABWR) technologies. In order to make the DMS more attractive, the University of Saskatchewan (U of S), Hitachi-GE and Hitachi Ltd. (Hitachi) have collaborated on a joint R&D; initiative to study the utilization of heat and steam from the balance of plant (BOP) associated with the DMS for thermal utilization (TU) applications. The intermediate heat exchange (IHX) system is inserted between the BOP and the TU system in order to prevent contamination by radioactive materials from the BOP to the TU system. As the pressure of the IHX loop is kept higher than the pressure of the BOP system, the radioactive materials included in the BOP steam is not discharged to the IHX loop even if the pipes of the heat exchanger between the BOP and the IHX are ruptured. In order to estimate the amount of heat that can be transferred to the TU side, heat balance simulators of the BOP and the IHX were developed by Hitachi and the U of S. In this paper, the evaluation results of the co-generation DMS will be introduced.

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