APPARATUS FOR INSPECTING LEAKAGE OF ONCE-THROUGH STEAM GENERATOR USING GAS CIRCULATION METHOD CAPABLE OF SHORTENING DETECTION PERIOD

摘要

PURPOSE: An apparatus for inspecting leakage of a once-through steam generator using a gas circulation method is provided to shorten a detection period by detecting leakage of a tube without removing an orifice from the tube. CONSTITUTION: A pre-circulation gas storage tank(1) is used for storing pre-circulation gas. A radiation detector(12) is used for measuring a radioactive level of the pre-circulation gas. A gas circulation tube(5) is used for circulating the pre-circulation gas and the post-circulation gas. A gas supply tube connection unit(7) is used for connecting gas supply tubes to each other. A gas shielding valve(2) is used for shielding gas according to a leakage state of gas. A pressure gauge(4) is used for measuring a gas pressure level. The first coolant flows into the first coolant path at the outside of tubes(8). The second coolant is distributed to each tube.