| 摘要 |
A method and an apparatus A, by which airtightness of a closed space (housing 1) provided with a steam movement control device S is confirmed. The apparatus is provided with an air feed passage (30) and an air exhaust passage (31), which communicate to an interior of a housing (1), the air feed passage (30) being connected to a gas injection device (32), which supplies a gas at a predetermined pressure, and the air exhaust passage (31) being connected to a pressure gauge (33). The method; wherein, while the gas of a predetermined pressure is injected into the housing (1) from the air exhaust passage by the gas injection device (32), pressure measurement is performed in the air exhaust passage (31) from the housing (1), and a measured pressure value is compared with an injection pressure value; and it is recognized that when the measured pressure value is substantially equal to the injection pressure value, airtightness in the housing (1) is maintained, and when the measured pressure value is lower than the injection pressure value, airtightness is lost.
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