Device for checking the disconnexion of the control clusters of a nuclear reactor
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United States of America Patent
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Apr 29, 1986
Grant Date -
N/A
app pub date -
Jun 6, 1983
filing date -
Jul 1, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The subject of the invention is a device for checking the disconnexion of the actuating rods of the control clusters before the removal of the internal equipment of a nuclear reactor, comprising, within a pit (10) forming a cooling pond, a vessel (1) closed by a removable cover and containing the core and a set of control clusters fitted slidably in the upper internal equipment forming a guide structure above the core, each cluster being fixed to the lower part (32) of an actuating rod (3) capable of being detached from the corresponding cluster, after opening the cover, by means of a disconnecting tool suspended from a charging crane (2) transportable above the cooling pond (10). The checking device according to the invention comprises a pole (4) of greater length than the distance between the platform and the level of the heads of the actuating rods, fitted at its upper part with means (44) for suspending and actuating the rotation of the pole about its vertical axis, and at its lower part with a bushing (5) for centering at a given level on the head of the actuating rod (3) and with an arm (7) extending transversely to the horizontal at the level of the heads (39) of the disconnected rods and of greater length than the distance between the axes of the clusters.
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