摘要:
Systems produce desired isotopes through irradiation in nuclear reactor (10) instrumentation tubes (50) and deposit the same in a robust facility for immediate shipping, handling, and/or consumption. Irradiation targets (250) are inserted and removed through inaccessible areas without plant shutdown and placed in the harvesting facility, such as a plurality of sealable and shipping-safe casks and/or canisters. Systems may connect various structures in a sealed manner to avoid release of dangerous or unwanted matter throughout the nuclear plant, and/or systems may also automatically decontaminate materials to be released. Useable casks (1290) or canisters (1260) can include plural barriers for containment that are temporarily and selectively removable with specially-configured paths inserted therein. Penetrations in the facilities may limit waste or pneumatic gas escape and allow the same to be removed from the systems without over-pressurization or leakage. Methods include processing irradiation targets through such systems and securely delivering them in such harvesting facilities.
摘要:
A nuclear reactor comprises a pressure vessel, a nuclear reactor core comprising fissile material disposed in the pressure vessel, and a core basket disposed in the pressure vessel and containing the nuclear reactor core. An incore instrument is disposed in a guide tube of the nuclear reactor core. The incore instrument has a cable extending out of the bottom of the nuclear reactor core and making a 180° turn. A bottom support element is attached to the bottom of the core basket and defines or includes a routing tube that routes the cable of the incore instrument through the 180° turn. In some embodiments, the pressure vessel includes upper and lower vessel portions, the nuclear reactor core and core basket are disposed in the lower vessel portion, and the vessel penetration is through the lower vessel portion or through a mid-flange connecting the upper and lower vessel portions.
摘要:
A method of refueling a nuclear reactor that includes the steps of removing the reactor vessel head and upper internals to a storage location and installing a cylindrical tank having open upper and lower ends, on the reactor vessel flange. The cylindrical tank is sealed to the reactor vessel and a penetration on the side of the cylindrical tank is sealed to a refueling canal that is connected to a spent fuel pool. The level of reactor coolant within the reactor vessel is then raised to at least partially fill the cylindrical tank to a level equal to that of the spent fuel pool. The refueling canal is then opened and a refueling machine supported on the reactor vessel is employed to transfer fuel assemblies between the core and the spent fuel pool.
摘要:
A nuclear steam generator support and alignment system that supports the entire weight of a nuclear steam generator on the walls of the shielding compartment in which the steam generator is designed to operate within. The support includes hydraulic positioners that can raise, lower, rotate and tilt the steam generator to align the steam generator with reactor coolant piping to which it is to be connected.
摘要:
A lifting fixture for removing the upper internals from a reactor to provide access to the core for refueling that does not require flooding of a refueling canal. The invention provides a means of shielding and ventilation that is integral to a lifting rig used to remove the upper internals. The lifting rig provides a means for personnel to decouple the drive rods from the rod cluster control assemblies so the drive rods can be lifted from the core with the upper internals while shielding maintenance personnel without flooding the area above the reactor.
摘要:
The present invention relates to an apparatus (9) and a method for cleaning a nuclear fuel element (8) in a liquid filled space (2). The fuel element (8) comprises an inner space (8a) with an opening (8b). The apparatus (9) comprises a connecting element (11), which is adapted to be connected to a portion of the fuel element (8), which comprises said opening (8b) and flow means (16, 32), which is adapted to create, at least during a part of a cleaning process of the fuel element (8), a liquid flow through inner space of the fuel element (8a) via said opening (8b).
摘要:
This patent discloses embodiments of a crane system that provide for high-capacity failure proof operation. For example, an overheard crane system mayinclude a trolley configured to translate between a first position and a second position. The crane system may further include a lift mechanism carried by the trolley or a support span portion of the trolley and be configured to releasably translate a chain between a support position and a lift position. The lift mechanism, in turn, could include a fixed latch configured to engage a first link of the chain, the fixed latch having an open position and a closed position, and a traveling latch movably aligned relative to the fixed latch and configured to engage a second link of the chain, the traveling latch having an open position and a closed position.