Control Rod Drive Mechanism
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United States of America Patent
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Issued Date -
Dec 8, 2016
app pub date -
May 26, 2016
filing date -
Jun 5, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A control rod drive mechanism (CRD) capable of more securely preventing outflow of water when a scram piping is broken is provided. In a CRD, a ball check valve is provided in a flange provided in a lower end portion of an outer tube. The ball check valve includes a ball, a retainer, and a ball support mechanism, and the retainer has a valve flow channel. The ball support mechanism for supporting the ball is provided in a lower opening portion. A height of an upper end of the ball support mechanism is set so as not to bring the ball into contact with an upper corner portion of the lower opening portion.
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