JPS6055795B
PURPOSE:To make possible detection of minute leakage at high sensitivity by flowing an inert gas in te welded bellows of a control rod driving device, drawing out the liquid metal having leaked through the bellows in the state of aerosol to the outside of the apparatus thereby detecting the same. CO...
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Zusammenfassung: | PURPOSE:To make possible detection of minute leakage at high sensitivity by flowing an inert gas in te welded bellows of a control rod driving device, drawing out the liquid metal having leaked through the bellows in the state of aerosol to the outside of the apparatus thereby detecting the same. CONSTITUTION:A vent hole 18 is provided near the bottom end of an operating cylinder 8 and a helical tube 19 is connected in the hole opened in the moving plate 10 at the top end thereof. A lead-out tube 20 is installed through the fixifng plate 17 of the cylinder 3 and its bottom end communicates with an inner chamber 14. When with a control rod driving device CRD 23, an Ar gas is forcefed through the inlet 21 of the tube 19, it flows out through the vent hole 18 of the cylinder 8. This gas washes the inside surface of a welded bellows 6 and diffuses in the inner chamber 14. If at this time the liquid metal existing on the outside of the bellows 6 leaks and enters, fine particles of metal oxides are produced. These particles pass through the tube 20 and are discharged to the outside of the cylinder 3. Even a slight amount of leakage may be detected with the detector for metal liquid of high sensitivity connected to the end of the tube 20, thus heavy leakage may be prevented before it occurs. |
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