Apparatus for use in the inspection of a top grid guide of boiling water reactor

An apparatus structured to be received into a boiling water reactor (BWR) and to be usable to inspect at least a portion of a top guide of the BWR, the top guide having a plurality of beams arranged in a grid pattern, the top guide further having a number of receptacles, a receptacle of the number of receptacles being defined by and situated adjacent a subset of beams of the plurality of beams that comprises a first pair of beams of the plurality of beams and a second pair of beams of the plurality of beams, each beam of the plurality of beams having an upper edge, the apparatus comprising:

• a housing comprising a base and a pair of supports, the pair of supports being situated on the base, each support of the pair of supports having an engagement edge, the engagement edges being structured to be received atop the upper edges of one of the first pair of beams and the second pair of beams;
• an alignment assembly situated on the base, wherein the alignment assembly comprises a plurality of legs that are structured to be engaged with the subset of beams and an actuator operable to move at least one of the plurality of legs in relation to the base and the subset of beams;
• an inspection system situated on the base and comprising at least a first inspection device that is structured to be situated in proximity to the upper edge of a beam of the other of the first pair of beams and the second pair of beams when the engagement edges are received atop the upper edges of the one of the first pair of beams and the second pair of beams;
• and
• the inspection system further comprising a drive apparatus that is situated on the base, the at least first inspection device being situated on the drive apparatus, the drive apparatus being operable to translate the at least first inspection device along an inspection path between a first location adjacent a first support of the pair of supports and a second location adjacent a second support of the pair of supports.