Apparatus for detecting nuclear reactor coolant leaks

An apparatus for detecting nuclear reactor coolant leaks, comprising:

• a shield
• having an internal space
• configured to allow sample air containing a coolant leaking from a primary coolant system pipe of a nuclear reactor to be introduced,
• and configured to close the internal space or expand the internal space through detachable coupling;
• a collection pipe
• provided to be located in a same area as the primary coolant system pipe and having a plurality of collection holes formed on an outer peripheral surface of the collection pipe in a longitudinal direction thereof,
• wherein the collection pipe allows the coolant to be introduced into at least one collection hole among the plurality of collection holes;
• a sensor disposed in the internal space, wherein the sensor is configured to detect and count a radiation from the sample air containing the coolant leaking from the primary coolant system pipe
• and obtain a radiation signal from the radiation;
• and
• a discriminator for determining, based on the radiation signal, whether the coolant is leaking,
• wherein the shield comprises:
• an inlet pipe connected to the collection pipe through which the sample air is introduced into the internal space;
• and
• a discharge pipe through which the sample air located in the internal space is discharged outside,
• wherein a time for the sample air containing the coolant to reach the shield varies according to locations of the plurality of collection holes, such that a count rate at a time of detecting the radiation changes according to a location of the at least one collection hole into which the coolant is introduced, and
• wherein the discriminator is configured to determine, based on a change in the count rate according to the locations of the plurality of collection holes, a leakage location of the coolant of the primary coolant system pipe.