| 摘要 |
The invention relates to a T-shaped pipefitting element ( 10 ) comprising a main tubular branch ( 10 a) having a first end for the connection thereof to a first pipefitting section ( 7 ) and a second end for the connection thereof to a second pipefitting section ( 6 ), a lateral branch ( 10 b) having an axis which is at an angle to the axis of the main branch ( 10 a), and a free end for connecting to a third pipefitting section ( 8 ) of the auxiliary circuit ( 1 ). The first, second, and third pipefitting sections ( 6, 7, 8 ) of the auxiliary circuit each ensure a different function to the two other sections, that is either the supply of the pipefitting element ( 10 ) with a first fluid at a high temperature, the supply of a second fluid to the pipefitting element ( 10 ), at a lower temperature than that of the first fluid, or the discharge of a mixture of the first and second fluids. The pipefittings ( 6, 7, 8 ) of the auxiliary circuit of the pressurised water nuclear reactor consist of austenitic stainless steel. The T-shaped pipefitting ( 10 ) consists of stainless martensitic steel with improved thermal endurance properties.
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