| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor pressure vessel (RVP) 10 for a reactor capable of measuring of a flow rate through each reactor internal pump(RIP) 32. SOLUTION: The reactor pressure vessel includes one or more reactor internal pumps, and each pump includes an impeller 52 and a diffuser 56. Two or more seal rings 86, 88 are extended in the circumferential direction, surrounding the exterior surface 74 of an external wall 60 of a diffuser housing 58, and arranged in grooves 76, 78, 80, 82 in the circumferential direction formed on the external wall of the housing. One or more lateral holes 94 are extended to the inside of a passage 62 in the longitudinal direction of the diffuser housing through the external wall of the housing. Each lateral hole is arranged in the area between two mutually adjoining seal rings, and each area between the seal rings includes one lateral hole. One or more pressure tap holes 98 are extended from the exterior surface 100 of a lower part panel board petal 16 of the RVP to the interior surface 92 of a pump deck opening 30 through a pump desk 28. Each pressure tap hole is line up with the area in the RIP including a corresponding lateral hole.
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