Development of the Medium Small BWR 'DMS' (Double MS: Modular Simplified and Medium Small Reactor)
- Hitachi Ltd. Power and Industrial Systems R and D Laboratory, 7-2-1 Omika-cho, Hitachi-shi, Ibaraki-ken, 319-1221 (Japan)
A new concept of the small and medium sized light water reactor, named the DMS has been developed by Hitachi, supported by the Japan Atomic Power Company. The DMS features significantly simplified plant systems realized by adoption of a natural circulation system of coolant and a free surface separation system (FSS). The DMS employs short length fuel assemblies and this enables natural circulation with a compact RPV. By adopting the natural circulation system, recirculation pumps and their driving power sources can be eliminated. The FSS uses the concept of steam and liquid separation by gravity, which is possible because of the low steam velocity due to the natural circulation and low power density of the DMS. By adopting the FSS, steam separation equipment needed in current BWRs can be eliminated. In addition, system components are rationalized and their layouts are modularized and standardized to attain a compact PCV; these result in a construction cost per unit power output almost comparable to that of current BWRs. In this study, the core design was improved taking plant cost and fuel efficiency into consideration. It was found that the number of fuel assemblies can be reduced about 11 % while maintaining the same thermal output as before, by extending the active fuel length. This makes it possible to reduce the number of control rod drive systems by about 12 % and to cut construction cost. (authors)
- Research Organization:
- American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
- OSTI ID:
- 21021080
- Resource Relation:
- Conference: 2006 International congress on advances in nuclear power plants - ICAPP'06, Reno - Nevada (United States), 4-8 Jun 2006; Other Information: Country of input: France; 7 refs; Related Information: In: Proceedings of the 2006 international congress on advances in nuclear power plants - ICAPP'06, 2734 pages.
- Country of Publication:
- United States
- Language:
- English
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