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AssigneeFramatome
InventorsDaniel Maire, Georges Moreau, Jacques Archer
Estimating the term…
The tank contains a liquid in which a radioactive element emitting gamma radiation is distributed substantially uniformly. A photon detector (15) is disposed in the vicinity of the external surface of a measurement, zone of the wall (12), a count is made of the photons emitted by the radioactive element distributed in the liquid (7), through the measurement zone of the wall (12), a number of photons determined by counting is compared with a reference number emitted by the radioactive element through a reference zone of the wall (12) and it is deduced therefrom whether or not a defect (8) is present in the measurement zone of the wall (12). The measurement device comprises a photon detector (15) disposed at one end of a collimator (16) made of heavy metal traversed by channels or windows (17).
Method for non-destructive examination of a wall of a vessel of an operating nuclear reactor containing a cooling fluid of the reactor comprising liquid sodium in which at least a part of the sodium is activated in the operating reactor and constitutes at least one radioactive element emitting gamma radiation distributed substantially uniformly in the cooling liquid of the reactor, said method comprising the steps of:
Dependencies are inferred from the claim text.