| 摘要 |
PROBLEM TO BE SOLVED: To prevent radioactive steam from flowing into a secondary heat exchanger when a heat transfer tube of a primary heat exchanger is broken. SOLUTION: This plant is equipped with the primary heat exchanger 1 into which steam from a turbine of an atomic reactor is introduced, a heat transport pipe 5 connected to an outlet tube bundle part 3 of the heat exchanger 1, the secondary heat exchanger 7 connected to the other end of the transport pipe 5, and a return pipe 6 for connecting the heat exchanger 7 and an inlet tube bundle part 4 of the heat exchanger 1. Isolation valves 14 and 15 are mounted on the transport pipe 5 and the return pipe 6, respectively. A radioactivity monitor 13 is mounted on the bundle part 3 of the heat exchanger 1. The radioactivity monitor 13 is electrically connected to the transport pipe-side isolation valve 14 by a signal supply line 16.
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