Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Flux monitoring
Patent
1992-03-30
1994-07-26
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Flux monitoring
376246, 376247, G21C 1700
Patent
active
053331583
ABSTRACT:
The device comprises a mobile probe which can be displaced inside thimbles. A plurality of ducts (20) for the passage and support of a thimble are disposed in the partitioning (6) of the reactor, around the core (4) along an axial direction and substantially over the entire height of the core. The ducts (20) are distributed circumferentially around the core (4). A plurality of feed-through sleeves in the cover of the vessel are each disposed along the axial extension of a duct (20) for the passage of a thimble. Guide columns each disposed along the axial extension of a duct and each engaged in a feed-through sleeve in the cover of the vessel form, with the corresponding duct (20) and feed-through sleeve, a channel for the reception of a thimble. An arrangement for the guidance, displacement, switching and parking of the mobile probe is disposed outside the vessel (1) and fixed on to the cover of the vessel. This arrangement comprises a plurality of guide tubes each connected at one of its ends to the apparatus for displacement, guidance and switching of the mobile probe and, at its other end, to a thimble. The device with mobile probe enables a readjustment to be carried out to the measurements of neutron flux made by a set of fixed instruments comprising in particular external multi-stage fission chambers (40).
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Damezin Jean
Desfontaines Guy
Millot Jean-Paul
Chelliah Meena
Framatome
Walsh Donald P.
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