US 11,657,923 B2
Feedwater sparger nozzle repair assembly
Bruce John Lentner, Wilmington, NC (US); Adrian M. Mistreanu, Wilmington, NC (US); and Jack Toshio Matsumoto, San Jose, CA (US)
Assigned to GE-Hitachi Nuclear Energy Americas LLC, Wilmington, NC (US)
Filed by GE-Hitachi Nuclear Energy Americas LLC, Wilmington, NC (US)
Filed on Dec. 21, 2021, as Appl. No. 17/557,770.
Application 17/557,770 is a division of application No. 16/381,153, filed on Apr. 11, 2019, granted, now 11,232,875.
Prior Publication US 2022/0115154 A1, Apr. 14, 2022
Int. Cl. G21C 17/017 (2006.01); F16L 55/18 (2006.01); G21C 21/00 (2006.01)
CPC G21C 17/017 (2013.01) [F16L 55/18 (2013.01); G21C 21/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of repairing a core spray pipe in a nuclear reactor, the core spray pipe having a plurality of nozzles extending from the core spray pipe, comprising the steps of:
cutting away a portion of the core spray pipe that includes a damaged nozzle to create an opening in the core spray pipe;
mounting a feedwater sparger repair assembly over the opening of the core spray pipe, the feedwater sparger repair assembly including a cover plate having a partial cylindrical shape and having a nozzle opening and a pair of bolt openings extending through the cover plate, a nozzle attached to the cover plate and surrounding the nozzle opening, a pair of T-bolts each extend through a respective one of the pair of bolt openings, the T-bolts each including a shank having a threaded portion extending from an exterior side of the cover plate and a partial cylindrical head portion disposed at an end of the shank on an interior of the core spray pipe and a pair of nuts engaged with the threaded portion of the pair of T-bolts, wherein the partial cylindrical head portion of the T-bolts are received in an interior of the core spray pipe and the pair of nuts are tightened on the threaded portion of the shank of the T-bolts so that the partial cylindrical head portion of the T-bolts are tightened against an interior surface of the core spray pipe in order to clamp the feedwater sparger repair assembly to the core spray pipe.