Ardscoil enjoyed the better of the exchanges in the opening half and took the lead midway through the half when scrum half Colm Noonan got in for a try for Ardscoil and Robbie Bourke converted.
Munchin's were back on level terms on the stroke of half time when hooker Peter Meyer touched down and Shane Airey converted to leave it 7-7 at the break.
Ardscoil regained the lead early in the second half when center Ronan McKenna got in for a try. Dan Goggin levelled for Munchin's with a try and Airey converted to put the Corbally College ahead.
Seven minutes from time skipper Lee Nicholas scored a third try for Munchin's and from there to the full time whistle Ardscoil never looked like getting back in the contest.
Ardscoil Ris: Stephen Fitzgerald; Colin Ryan, Ronan McKenna, Robbie Deegan, Brion Moriarty; Robbie Bourke, Colm Noonan; Tony Cusack, Jack O'Halloran, Conor Glynn (capt); Patrick Kearns, Frank Bradshaw Ryan; Cathal Flanagan, Paul Obande;, Craig Irwin. Replacements: Killian Bracken, Thomas Walsh, Kelvin Browne, Shane Fenton Joe Cannon, Joe Murray, David O'Mahony, Oscar Lyons. St. Munchin's: Shane Halpin; Edward O'Keeffe, Dan Goggin, Dylan Kelly, Gary Bateman; Shane Airey, Ryan Meagher; David Begley, Peter Meyer, Brendan Keogh; Shane O'Mullan, Tom O'Dwyer; Lee Nicholas (capt), John Sheehan, Ben Kilkenny. Replacements: Thomas Madden, Eoghan Brennan, Jordan Prendeville, Killian Browne, Nathan Nugent, Alan Wallace, Shane Doona, Kelton Faloon.
Referee: B O'Connell (M.A.R.).
Munster Schools Junior Cup Quarter Finals:
Ardscoil Ris v P.B.C. Wednesday 27th February, 3pm, Clifford Park.
Crescent College Comprehensive v Glenstal Abbey, Wednesday 27th February, 3pm, Rosbrien.
Rockwell v C.B.C., Wednesday 27th February, 3pm, Clanwilliam Park.
Castletroy College v St. Munchin's, Thursday 28th February 3pm, Annacotty.
Munster Schools Senior Cup Semi Finals:
Crescent College Comprehensive v C.B.C., Limerick, 7th March, 3pm
Rockwell v St. Munchin's, Venue to be confirmed, 5th March, 3pm;