Back at the Thomond Park venue at which he enjoyed so much success as Munster coach, Kidney saw his side race into a 38-0 interval lead before finishing off the job with a hat-trick of tries in the second half.
Outside half Ronan O'Gara kept the scoreboard ticking over with a penalty and five conversions in that one-sided first-half and there was also a try for Munster's debutant full back, Keith Earls.
Earls got on the scoresheet after only two minutes of his Test career and further first-half tries followed from Rob Kearney (two), Jamie Heaslip and Tommy Bowe.
Ospreys star Bowe grabbed a second after the break and replacements David Wallace and Alan Quinlan also got in on the act. Paddy Wallace added a conversion to complete the scoring.