发明名称 |
NUCLEAR REACTOR BOTTOM-MOUNTED INSTRUMENTATION NOZZLE REPAIR METHOD |
摘要 |
A method for removing and replacing a bottom-mounted instrumentation nozzle on a nuclear reactor pressure vessel. The method (i) caps or plugs the existing bottom- mounted instrumentation nozzle; (ii) cuts the nozzle at or near the nozzle to in-core instrument tube weld; (iii) installs a water-tight sealing enclosure outside the vessel over the bottom of the bottom-mounted instrumentation nozzle creating a water-tight seal with the underside of the reactor vessel; (iv) cuts to sever the existing bottom nozzle from the reactor vessel; (v) extracts the existing nozzle; (vi) installs a replacement alloy 690 nozzle or plug from inside the vessel; and (vii) welds the replacement nozzle or plug in place. The replacement bottom-mounted instrumentation nozzle incorporates an integral shoulder that prevents ejection during operation and facilitates installation, and the entire method is performed while the reactor pressure vessel is filled with water. |
申请公布号 |
WO2014074155(A1) |
申请公布日期 |
2014.05.15 |
申请号 |
WO2013US37709 |
申请日期 |
2013.04.23 |
申请人 |
WESTINGHOUSE ELECTRIC COMPANY LLC |
发明人 |
NEWTON, BRUCE R.;PELLE, MIHAI A. |
分类号 |
G21C13/036;G21C13/028;G21C13/06 |
主分类号 |
G21C13/036 |
代理机构 |
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