Scrum half David Jones, wing Harrison Button and full back Callum Williams all grabbed a brace of tries as the visitors romped into a 34-0 lead. Outside half Bradley Roderick also scored a try and added four conversions for a match tally of 12 points.
Other tries flowed from replacement Zac Giannini and wing Liam Cox. The only points for the Ospreys came in the 54th minute when Liam Seaward crossed for their solitary try.
The Dragons kicked-off their campaign with a 28-15 away win over Cardiff Blues. Wing Ethan Clayden launched the victory march at the Arms Park with a try after only three minutes.
That try was improved by Will Reed, but the Blues hit back with a Josh Phillips penalty and a try from Aneuran James to grab the lead. The score remained 8-7 at half-time before three second half tries from the Dragons saw them home.
Scrum half Dylan Davies, full back Jake Morgan and hooker Brodie Coghlan crossed and Reed converted all three. The Blues edged back in front at 15-14 with a try from Theo Cabango which was converted by Roberts.
RAG Under 18 – Round 1
Blues 15 – 28 Dragons
Ospreys 5 – 53 Scarlets
RAG Under 18 – Round 2
Wednesday, 29 August
Scarlets v RGC 1404
Dragons v Ospreys
RAG Under 18 Teams
Ospreys: Declan Thomas; Callum Dodd, Bradley Roderick, Joe Hawkins, Lloyd Freeman; Iestyn Morgan; Lewis Jones, Jae Key, Jay Roberts, Trystan Davies, Rhys Thomas (captain), Tavis Huntley, Harry Deaves, Morgan Strong
Reps: Â Oliver Burrows, Dyfan Ceredig, Kieran Stevens, Billy Moxey, Jordan Evans, Liam Seaward, Cory Taylor, Iestyn HopkinsÂ
Scarlets: Callum Williams; Harrison Button, Josh Davies, Dean James, Liam Cox; Bradley Roderick, David Jones; Sam O’Connor, Rhodri King, Harri O’Connor, Owen Jones, Ryan Evans, Harry Breeze, Caine Rees-Jones, Sam Williams (captain)
Reps: Llew Phillips-Taylor, Iwan Twigg, Zac Giannini, Rhys Williams, Leon Samuel, Luke Davies, Carwyn Morris, Harri Jones
Cardiff Blues: Oliver James; Dafydd Thomas, Mason Grady, Iwan Sheppard, Theo Cabango; Josh Phillips, Keian Richards; Christian Brooks, Aneurin James, Iestyn Haskins, Mitch Barnard, Chris Tshiunza, Cai Davies, Ethan Fackrell, Ieuan Pring (capt)
Reps: Corben Evans, Travis Green, Nathan Evans, Craig Miller, Alex Mann, George Riley, Bailey Roberts, Will Clapham
Dragons: Jake Morgan; Lewis Bates, Ollie Stansfield, Ollie Lewis, Ethan Clayden; Will Reed, Dylan Davies; Henry Hibbs, Brodie Coghlan, Owen Peddle, Joe Peard, Ben Carter, Benji Hoppe, Oli Howard, Ben Torjeson
Reps: Jack Wakeley, Aaron Dowse, Clay Gibbons, Callum Oliver, Matthew Jefferies, Joe Christofferson, Â Jonny Paynter, Carrick McDonnagh
In the RAG Under 16 tournament, Dragons Red (formerly known as North) lost 24-10 to Cardiff Blues at Ystrad Mynach. Dragons Black (formerly known as South) were beaten 26-5 at St Clears by Scarlets West, while in the other fixture, Cardiff Blues North beat Ospreys West 31-12.
RAG Under 16 – Round 1
Scarlets East 35 – 19 RGC 1404
Scarlets West 26 – 5 Dragons South
Blues North 31 – 12 Ospreys West
Dragons North 10 – 24  Blues South
RAG Under 16 – Round 2 Fixtures
Wednesday, 29 August
Blues South v Scarlets West      Â
Dragons North v Blues North
Scarlets East v Ospreys East
Sunday, 2 September
Dragons South v RGC 1404
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