A vessel electrical penetration assembly for a feed-through of nuclear reactor vessel, the assembly including: a docking tube to form an extension of the secondary containment barrier of the reactor, the docking tube including: a first end to be positioned in the interior of the vessel and to be mechanically and sealably connected to an actuator in the interior of the vessel, and a second end to be mechanically and sealably secured to the vessel; a seal-tight electrical bar that passes through the docking tube and having on either side seal-tight connectors ensuring an electrical link between the actuator and the exterior of the reactor; the seal-tight electrical bar including a system for limiting a leakage of primary liquid to the exterior of the vessel if the secondary containment barrier extension fails; and a mechanical maintaining system for securing, under the required pressure conditions, the electrical bar to the vessel.

A containment seal seals a cable or tube to an opening accessing a containment vessel. The containment seal includes a lower body that attaches over the opening into the containment vessel. The cable or tube is inserted through a hole that extends axially through an upper body of the containment seal. Compression fittings are attached to the top and bottom ends of the upper body sealing the cable inside of the upper body. The cable sealed inside of the upper body in inserted through the lower body and into the opening accessing the containment vessel and a lower portion of the upper body is seated into the opening formed in the lower body. A retaining device compresses the upper body down against the lower body forming a seal between the upper body and lower body.

A containment seal seals a cable or tube to an opening accessing a containment vessel. The containment seal includes a lower body that attaches over the opening into the containment vessel. The cable or tube is inserted through a hole that extends axially through an upper body of the containment seal. Compression fittings are attached to the top and bottom ends of the upper body sealing the cable inside of the upper body. The cable sealed inside of the upper body in inserted through the lower body and into the opening accessing the containment vessel and a lower portion of the upper body is seated into the opening formed in the lower body. A retaining device compresses the upper body down against the lower body forming a seal between the upper body and lower body.

A nuclear reactor (1) includes a vessel (3) has a central axis (X); and a core (5) arranged in the vessel (3). The core (5) includes a plurality of nuclear fuel assemblies, a primary water layer (7) separating the core (5) from the vessel (3) radially from the central axis (X) and surrounding the core (5); and a system (9) for controlling and protecting the nuclear reactor. The control and protection system (9) includes a device (11) for continuously measuring the neutron flux emitted by the core (5). The measuring device (11) includes at least one neutron detector (12) arranged in the primary water layer (7) separating the core (5) from the vessel (3).

A nuclear reactor (1) includes a vessel (3) has a central axis (X); and a core (5) arranged in the vessel (3). The core (5) includes a plurality of nuclear fuel assemblies, a primary water layer (7) separating the core (5) from the vessel (3) radially from the central axis (X) and surrounding the core (5); and a system (9) for controlling and protecting the nuclear reactor. The control and protection system (9) includes a device (11) for continuously measuring the neutron flux emitted by the core (5). The measuring device (11) includes at least one neutron detector (12) arranged in the primary water layer (7) separating the core (5) from the vessel (3).

Apparatus for amplifying low level signals within a nuclear plant's containment building, derived from the ex-core nuclear instrumentation system. The system employs vacuum micro-electronic devices in place of conventional pre-amplifier assemblies to position the pre-amplifier assemblies closer to and within the vicinity of the ex-core detector outputs.

Apparatus for amplifying low level signals within a nuclear plant's containment building, derived from the ex-core nuclear instrumentation system. The system employs vacuum micro-electronic devices in place of conventional pre-amplifier assemblies to position the pre-amplifier assemblies closer to and within the vicinity of the ex-core detector outputs.

A nuclear reactor (1) includes a vessel (3) has a central axis (X); and a core (5) arranged in the vessel (3). The core (5) includes a plurality of nuclear fuel assemblies, a primary water layer (7) separating the core (5) from the vessel (3) radially from the central axis (X) and surrounding the core (5); and a system (9) for controlling and protecting the nuclear reactor. The control and protection system (9) includes a device (11) for continuously measuring the neutron flux emitted by the core (5). The measuring device (11) includes at least one neutron detector (12) arranged in the primary water layer (7) separating the core (5) from the vessel (3).

A nuclear reactor (1) includes a vessel (3) has a central axis (X); and a core (5) arranged in the vessel (3). The core (5) includes a plurality of nuclear fuel assemblies, a primary water layer (7) separating the core (5) from the vessel (3) radially from the central axis (X) and surrounding the core (5); and a system (9) for controlling and protecting the nuclear reactor. The control and protection system (9) includes a device (11) for continuously measuring the neutron flux emitted by the core (5). The measuring device (11) includes at least one neutron detector (12) arranged in the primary water layer (7) separating the core (5) from the vessel (3).

A power distribution plate (PDP) sits on top of a support plate. Control rod drive mechanism (CRDM) units are mounted on top of the PDP, but the PDP is incapable of supporting the weight of the CRDM units and instead transfers the load to a support plate. The PDP has receptacles which receive cable modules each including mineral insulated (MI) cables, the MI cables being connected with the CRDM units. The PDP may further include a set of hydraulic lines underlying the cable modules and connected with the CRDM units. The cable modules in their receptacles define conduits or raceways for their MI cables and for any underlying hydraulic lines.