Union, the ECAC champion, will face conference rival Quinnipiac, the top seeded in the 16-team tournament, on Sunday for a spot in the Frozen Four in Pittsburgh. Quinnipiac is 2-0 against Union this season.
Jooris opened the scoring on a power play in the first period, and made it 2-0 early in the second to carry the Dutchmen (22-12-5) to their seventh straight victory. Cole Ikkala put a soft goal past goalie Parker Milner, and Shayne Gostisbehere added a power-play goal to cap the three-goal second period.
Daniel Ciampini completed the rout with a power-play goal at 5:19 of the third period.
Daniel Carr and Wayne Simpson had two assists apiece for the Dutchmen.
Grosenick, a finalist for last year's Hobey Baker Award, didn't have to be outstanding as his teammates outskated and outworked the Eagles (23-12-4). He did face 16 shots in the third period and lost what would have been his second shutout in the last three games when 2013 Baker finalist Johnny Gaudreau scored with 3:58 left.
BC coach Jerry York, the winningest coach in NCAA history, returned after missing two games because of eye surgery. He wore a patch over his right eye.
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