Injection device
First Claim
1. In a nuclear reactor pressure vessel having a cylindrical side wall with an interior surface, at least one nozzle penetrating said side wall, piping penetrating said side wall at said nozzle, said nozzle and said piping forming an annular gap at said interior surface of said side wall, and means for decontaminating said reactor pressure vessel at said annular gap, said means for decontaminating comprising:
- a casing;
means for suspending said casing in the reactor pressure vessel from a position above the reactor pressure vessel, whereby said casing can be positioned adjacent to the gap;
at least one injection nozzle arranged at a positive dip angle in said casingmeans for supplying high-pressure liquid to said at least one injection nozzle;
means mounted on said casing for detecting that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap; and
means for selectively fixing said casing to the reactor pressure vessel when said detecting means detects that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap.
1 Assignment
0 Petitions
Accused Products
Abstract
Injection device used when a reactor is shut down to remove radioactive substances from within the gap between the internal piping and the inside of the nozzles of a RPV by injecting fluid towards the inside of these nozzles. The injection device is equipped with an injection nozzle that injects fluid towards the end of the gap, a casing that supports this injection nozzle, a suspension mechanism whereby the casing is movably suspended from above the RPV, a water feed device that supplies high-pressure fluid to the injection nozzle, a sensor or the like that senses when the casing is positioned directly above the internal piping and a fixing mechanism that temporarily fixes the casing to the inside wall of the RPV.
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Citations
17 Claims
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1. In a nuclear reactor pressure vessel having a cylindrical side wall with an interior surface, at least one nozzle penetrating said side wall, piping penetrating said side wall at said nozzle, said nozzle and said piping forming an annular gap at said interior surface of said side wall, and means for decontaminating said reactor pressure vessel at said annular gap, said means for decontaminating comprising:
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a casing; means for suspending said casing in the reactor pressure vessel from a position above the reactor pressure vessel, whereby said casing can be positioned adjacent to the gap; at least one injection nozzle arranged at a positive dip angle in said casing means for supplying high-pressure liquid to said at least one injection nozzle; means mounted on said casing for detecting that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap; and means for selectively fixing said casing to the reactor pressure vessel when said detecting means detects that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a nuclear reactor pressure vessel having a cylindrical side wall with an interior surface, at least one nozzle penetrating said side wall, piping penetrating said side wall at said nozzle, said nozzle and said piping forming an annular gap at said interior surface of said side wall, and means for decontaminating said reactor pressure vessel at said annular gap, said means for decontaminating comprising:
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a casting; means for suspending said casing in the reactor pressure vessel from a position above the reactor pressure vessel, whereby said casing can be positioned adjacent to the gap; at least one injection nozzle arranged in said casing; means for supplying high-pressure liquid to said at least one injection nozzle; means mounted on said casing for detecting that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap; and means for selectively fixing said casing to the reactor pressure vessel when said detecting means detects that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap, said fixing means comprising at least one electromagnet fixed to said casing. - View Dependent Claims (12, 13, 14)
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15. In a nuclear reactor pressure vessel having a cylindrical side wall with an interior surface, at least one nozzle penetrating said side wall, piping penetrating said side wall at said nozzle, said nozzle and said piping forming an annular gap at said interior surface of said side wall, and means for decontaminating said nuclear reactor vessel at said annular gap, said means for decontaminating comprising:
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a casing; means for suspending said casing in the reactor vessel from a position above the reactor pressure vessel, whereby said casing can be positioned adjacent to the gap; at least one injection nozzle arranged in said casing; means mounted on said casing for supplying high-pressure liquid to said at least one injection nozzle; means for detecting that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap, said detecting means comprising at least one tough sensor; and means for selectively fixing said casing to the reactor pressure vessel when said detecting means detect that said at least one injection nozzle is positioned such that high-pressure liquid therefrom may be injected into the gap. - View Dependent Claims (16, 17)
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Specification