Adam Cairns, the Chief Executive of Cardiff and Vale University Health Board - which runs the University Hospital of Wales - spoke to ITV News this evening.
He told Jonathan Hill that the findings of the report by the Royal College of Surgeons are "troubling, worrying and unacceptable".
He said the primary problem - of getting patients into the hospital - caused cancellations of planned procedures, and needs to be tackled with a "much more resilient plan" in future.
More top news
The family of a murdered Cardiff woman are due to hear if they can go ahead with a claim for negligence against two Welsh police forces.
Today sees the release of the latest ambulance response times in Wales for December 2014.
Outbreaks of rain soon clearing southeastwards with brighter but colder conditions following and scattered showers