Remote examination of reactor nozzle J-groove welds
First Claim
1. A photothermal system for checking the integrity of J-groove welds in a nuclear reactor comprising:
- a closure head of the reactor having a series of pipes extending there through into the reactor;
a circumferential weld around each of said series of pipes extending through said closure head;
a laser assembly located inside the reactor remotely from one of said circumferential welds for heating said weld;
an IR camera located inside the reactor remotely located from said one circumferential weld but able to view said weld; and
movable means for moving said IR camera along said heated weld to sense the infrared temperature profile of said heated weld.
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Accused Products
Abstract
A combined laser and infra red sensing camera is located beneath the reactor head in the vicinity of the closure head tube welds by manipulating known robotic device handling the laser which is used to heat a line along the surface thereby generating a thermal wave that propagates over the one to two square inch test area where the increased thermal resistance of cracks and anomalies makes the surface temperature profile gradient greater at a crack or anomaly. An IR camera captures the test area image of interest as the thermal wave propagates across the target inspection area and the image is processed and enhanced to show cracks and other anomalies as a sharp drop in the thermal scan at the point of the crack using known Photo Thermal NDE technology to convert the scan into a pictorial representation of the scanned surface clearly showing any cracks therein. This process is repeated sequentially until the entire circumference of the weld is scanned.
29 Citations
6 Claims
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1. A photothermal system for checking the integrity of J-groove welds in a nuclear reactor comprising:
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a closure head of the reactor having a series of pipes extending there through into the reactor;
a circumferential weld around each of said series of pipes extending through said closure head;
a laser assembly located inside the reactor remotely from one of said circumferential welds for heating said weld;
an IR camera located inside the reactor remotely located from said one circumferential weld but able to view said weld; and
movable means for moving said IR camera along said heated weld to sense the infrared temperature profile of said heated weld. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification