[en] The design of a remotely-operated ultrasonic leak detector is described. The detector is basically an ultrasonic microphone with parabolic reflector, amplifier, stepping motors to move the microphone, and a display unit. (E.C.B.)

[en] A multichannel leak detection system has been developed to detect any chemical leak during the electrochemical etching process. It gives an audible and a visible warning when there is a leak at any part of the system. This greatly helps in isolating the defective sample quickly. It can be removed during operation, while the etching process continues on other samples. The circuit is built from standard integrated circuits and has its own power supply. Provisions have been made to connect this system to the computer for recording date, time and location of the leaky unetched samples. (author)

[en] In this work a short overview is given of the different leakage search methods and the main functions (main current, inverse current) of modern helium leak indicators as well as several example for application are presented. (orig./HP)

[en] The volume of a cavity, such as a cylinder and a piston, connected to the enclosure (glovebox or reactor containment shell) is varied to find back the previous pressure difference with the outside (positive or negative). Thermometers and a barometer are provided for eventual corrections

[en] The container for fissile materials, such as plutonium oxides or highly enriched uranium, comprises a closure device allowing leak testing. Tightness is obtained with two concentric O rings. Leaks are detected in the space between the two seals

[en] The development of leak detection monitoring by the Annulus Gas System (AGS) for the Ontario Hydro Nuclear Stations over the last several years is reviewed. Verified models were used to modify the AGS and provide the operators with safe operating limits. The current AGS design gives the operator an adequate warning to take timely action and if needed to shutdown the reactor safely in a controlled fashion

[en] Published in summary form only

[en] The main patent application concerns a composite material that may be used for detecting liquid metal leakages. This material includes a fabric of refractory mineral and electrically insulating threads in which electric conducting wires are inserted at regular intervals and electrically insulated with respected to the outside surfaces of the materials. More precisely, the electric conducting wires are preferably arranged in parallel to the warp of the fabric. According to a particular fabrication method, the substance concerned can be constituted of a stack of layers comprising a central layer of a web of insulating threads in which electric conducting wires are buried at regular intervals. This central layer is placed between at least two external layers made of a refractory and electrically insulating mineral thread fabric

[en] A system is disclosed for detecting small leaks at low pressures in hermetically sealed units that includes a first flow circuit for connecting a test unit to a source of pressurized gas (air) to place the unit at a desired test pressure. The gas (air) is then rerouted through a second flow circuit containing a bubble chamber so that in the event of a leak, a stream of bubbles are produced in a liquid. The presence of bubbles in the liquid is detected by a doppler radar which provides an alarm signal in response thereto. The mass displacement of the bubbles within the liquid is controlled and the time period between bubbles is sensed to provide sufficient data to quantify the leak rate

[en] An automated leak test system for tritium shipping containers has been developed at Westinghouse Savannah River Co. (WSRC). The leak detection system employs a computer controlled helium detector which allows an operator to enter key information when prompted. The software for controlling the tests and the equipment apparatus were both designed and manufactured at the Savannah River Technology Center within WSRC. Recertification Test: Every twelve months, the pressure vessel portion of the shipping container itself must undergo a rigorous recertification leak test. After an empty pressure vessel (shipping container) is assembled, it is placed into one of six stainless steel belljars for helium leak testing. The belljars are fashioned in row much the same as assembly line arrangement. Post-load Test: A post-load leak test is performed upon reservoirs that have been filled with tritium and placed inside the shipping containers mentioned above. These leak tests are performed by a rate-of-rise method where the area around the shipping container seals is evacuated, valved off from the vacuum pump, and then the vacuum pressure is monitored over a two-minute period. The Post Load Leak Test is a quality verification test to ensure that the shipping container has been correctly assembled. 2 figs