| 摘要 |
PURPOSE:To sample effectively a trace quantity of a sodium component generated from leaked sodium by both sampling nozzles, by attaching the sampling nozzle consisting of a hole bored pipe to vertical part piping having within the sodium of a gas sampling type sodium leakage detector in a lengthwise direction along the piping and also, attaching the sampling nozzle consisting of the hole bored pipe surrounding the outer circumference of the piping to the vertical part piping. CONSTITUTION:A heat insulating structure 2 is attached to the outside of a horizontal piping 1 and a hole bored pipe 5 is connected to an attaching hole bored pipe 5 in an annular space 4 between the outer surface of the piping 1 and the inside of the structure 2 along an axis direction of the structure 2 and a take-out nozzle 6 penetrating the structure 2 is provided in the space 4. A heat insulating structure 2', a preheater 3' and an annular space 4' in a vertical piping part 7 are constituted the same to the horizontal piping 1 but the shape of a sampling nozzle is made in an annular hole bored pipe and a ring hole bored pipe 8 is provided surrounding the vertical piping once and the pipe 8 is connected to the sampling nozzle and then, a take- out nozzle 9 penetrating the structure 2' is provided to the pipe 8. Hereby, the sampling is made possible even if a sodium compenent is inclined toward a specific angle (direction on the circumference of a circle) in the part 7 and besides, a convection of the gas at the vertical part is prevented. The control effect of the convection in a length-wise direction at the horizontal part is obtained because the convection at the vertical part is prevented and detection accuracy of the sampling at the horizontal part is improved. |
