"I just heard a bang and a bit of a shake," she said.
The family returned to their home at 19:00 GMT.
"We feel a lot better now. We're happy to be home," said Mr Impey.
The device - about 1m (3.2ft) long and weighing about 250kg (39st 5lbs) - was discovered on Southtown Road by a contractor working on the third crossing over the River Yare. บาคาร่าsa
Specialists had built a protective sand barrier around the bomb prior to attempts to detonate it, as part of safety measures.