Munster full back Niamh Briggs opened scoring after 15 minutes with a penalty followed moments later with a try from Tralee's Siobhan Fleming.
Ulster tried to find their way back into the game but were left further behind after an excellent try from Munster centre Geraldine Rea and converted by Briggs leaving the score at half time 0-15.
Six minutes into the second half Niamh Kavanagh scored in the corner for Munster which was again converted by Briggs.
Once again Ulster came back at Munster and made their defence work hard before Geraldine Rea popped up for her second try of the game.
Niamh Briggs finished the game for Munster scoring a terrific try under the posts with an easy convertion before the final whistle.
Finals to take place 4th December - Venue TBC, Leinster
Munster v Ulster Women's Squad: Niamh Briggs (UL Bohs), Olivia Stapleton (UL Bohs), Mairead Kelly (UL Bohs), Geraldine Rea (Highfield) Sarah Jane Cody (UL Bohs), Helen Brosnan (Highfield) (Capt), Louise Beamish (UL Bohs), Laura Guest (Highfield) Christine Fanning (Highfield), Gillian Bourke (Bristol), Karen Casey (Highfield), Heather O'Brien (Highfield), Louise Austin (Blackrock), Siobhan Fleming (Tralee), Helen Jones (Highfield). Replacements: Kate Sheehan (UL Bohs), Fiona Reidy (UL Bohs), Maeve Darcy (Clonmel), Joy Nevelle (UL Bohs), Orlaith Buckley (Highfield), Clara Bracken (Clonmel), Ashling Hutchings (UL Bohs), Nicola Scully (Clonmel), Niamh Kavanagh (UL Bohs).