Measuring and testing – Testing sealed receptacle
Patent
1978-05-18
1980-01-01
Woodiel, Donald O.
Measuring and testing
Testing sealed receptacle
73 493, 176 19LD, G01M 332
Patent
active
041810082
ABSTRACT:
A method for determining and assuring that the pressure charged in a fuel rod is retained therein after the rod is sealed by welding a hole closed in the fuel rod end plug. The fuel rod end having the open end plug therein is sealed in a plenum chamber of known volume. A helium source then charges a first chamber to a predetermined pressure, and after isolating the helium source, the first chamber is discharged into the plenum chamber and the fuel rod. If a pressure sensor in the system indicates a relatively high reading, the end plug has not permitted gas to pass into the fuel rod. A relatively low reading indicates that the fuel rod has been pressurized and the hole in the end plug is then welded shut. To verify that the end plug is properly sealed, the plenum chamber is vented to a third chamber of known volume and the system pressure is then determined. If such pressure reaches a predetermined high value, the end plug weld is defective. A relatively low reading indicates that the integrity of the seal weld is sound.
REFERENCES:
patent: 3504528 (1970-04-01), Weinberg et al.
patent: 3818752 (1974-06-01), Lindebeeg
Campbell J. R.
Dermer Z. L.
Westinghouse Electric Corp.
Woodiel Donald O.
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