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6. Recirculation loops
Recirculation loops provide the link between the vessel and the primary circuit equipment: steam generators (SGs), pumps and pressurizer. The primary circuit is made up of three or four loops, each comprising a SG and a pump (three loops for 900 MW PWRs, four for 1,300, 1,450 MW PWRs and the EPR™) (figure 14 ).
6.1 General design
For reasons of economic optimization, we aim for the most compact possible layout of primary equipment in the reactor building.
The diameter of the main pipes is the result of a compromise between their necessary flexibility and the speed of the water (pressure drops, vibrations). They range from 680 mm (900 MW) to 800...
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Recirculation loops
Primary pump sets
Bibliography
Regulations
ESPN (Équipements sous Pression Nucléaires) decree of December 12, 2005 on the application in France of pressure vessels to primary equipment.
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