Abstract: A plate heat exchanger for homogenous fluid flows between ducts includes primary passages and secondary passages. The secondary passages include a first group fluidly connecting a first secondary supply collector to a secondary discharge collector. The first group of secondary passages have a first total passage section at half-length between the first secondary supply collector and the secondary discharge collector. The first group of secondary passages have a second total passage section at the output of the first secondary supply collector of less than 10% of the first total passage section of the first group of secondary passages.

Abstract: A pressurized water nuclear reactor includes a primary shell formed by a vessel integrating a core of the nuclear reactor and a cover; a pressurizer built into the shell including hydraulic lines connected to external circuits, the cover of the shell forming an upper wall of the pressurizer, wherein at least one hydraulic line of the pressurizer is formed by: a first line arranged through the vessel of the primary shell and under a plane for positioning the cover onto the vessel, and a second line secured to the cover; the first line and the second line being suitable for sealingly and detachably fitting into one another when the cover is positioned onto the vessel, and a resilient system ensuring the contact between ends of the first and second lines.

Abstract: A plate heat exchange for homogenous fluid flows between ducts is provided. The plate heat exchanger includes a plurality of primary plates, wherein are made a plurality of primary passages; a plurality of secondary plates, wherein are made a plurality of secondary passages; first and second collectors for supplying secondary fluid and a collector for discharging the secondary fluid, made in the primary and secondary plates and extending substantially perpendicularly to the primary and secondary plates, the primary and secondary plates being parallel to a determined longitudinal axis and having a common middle plane containing the longitudinal axis; the secondary discharge collector is located at a first longitudinal end of the primary and secondary plates in the middle plane, the first and second secondary supply collectors being located at a second longitudinal end of the primary and secondary plates opposite to the first, symmetrically relatively to the middle plane and away from the middle plane.