barit1,
an uncontained failure is when high-energy debris is released from the engine. I have seen turbine blades puncture the casing of a Trent 800 and hit the fueslage, but it was still classified as contained by RR and the authorities, because the single blade did not have 'high-energy'. If this is a disc failure then it is most certainly going to be classified an uncontained failure.
Best Regards,
N1 Vibes