IMPROVEMENTS RELATING TO BOILING WATER REACTORS
ABS>A boiling water reactor comprises two different ways of circulation for the boiling water flowing through the reactor core and well, a forced circulation for a central region of the core, and a natural circulation for the periphery region enclosing said certral region. Suitably two coaxial vertical tubular dividing walls are placed within the reactor vessel, the inner one enclosing the fuel elements of the central region and being open at its top, while the fuel elements of the periphery region are placed within the annular space formed between the two coaxial dividing walls. The inner dividing wall reaches with its lower end to the bottom of the pressure vessel where an entrance tube is provided for entering the water flow of the forced circulation. The annular space is fed via its open lower extemity with water in natural circulation coming from the remaining space within the vessel filled with water to a level higher than the upper borders of the dividing walls. The water cycle of the natural circulation is closed either within the pressure vessel or via header means situated inside the pressure vessel over a steam drum disposed outside the pressure vessel. (IIB)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-009965
- OSTI ID:
- 4725149
- Report Number(s):
- FR 1270886
- Country of Publication:
- France
- Language:
- English
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