| 摘要 |
PROBLEM TO BE SOLVED: To easily replace an orifice in a short time. SOLUTION: In the feed water inlet 33 for a steam generator comprising a tube plate 34 having holes 35 for fixing an inlet of a heat transfer tube 37, and an orifice plate 38 detachably provided at the plate 34 through a clamping portion 41, the plate 34 has a plurality of protrusions 40 capable of being inserted into the holes 35 of the plate 34, and a sealing portion 43 for preventing leakage of a connecting portion to the plate 34, and the protrusion 40 has an orifice hole 44 penetrating through the end of the protrusion 40 from a surface of the plate 38.
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