Staff at the Ashley Youth Detention Centre have told investigators they feel undermined by management and unable to respond appropriately to incidents, a union representative says.

A Worksafe Tasmania investigation into the health and safety for workers at the centre at Deloraine in northern Tasmania was among a raft of investigations ordered by the State Government.

A staff member was stood down over their conduct while restraining a young person during standoffs at Tasmania's only youth detention facility in July.

It is understood a group of teenage boys brandished shards of glass and threatened staff during the incidents.

Robbie Moore from the Health and Community Services Union said members had been interviewed as part of the Worksafe investigation.

He said they were concerned about the procedures in place for authorising responses to incidents at Ashley.

"There is inadequate structures in place," he said.

"They're reliant on one manager who can't possibly be on call 24/7, seven days a week.

"We're hearing from our members that they feel often undermined by management and unable to act appropriately at the time to make sure there's a safe workplace."

He said one of the incidents in July necessitated restraining a resident for the safety of other young people at the centre.

"Management were uncontactable, and yet the protocol said management had to authorise allowing the resident to be taken to their room," Mr Moore said.

"There's a lot of issues when it comes to guidelines around how to deal with challenging situations.

"Members do not feel there is an adequate system in place so that they know what they should do in any situation."

Four separate inquiries underway

The State Government said four separate inquiries into the Ashley Youth Detention Centre were underway.

Acting Premier Jeremy Rockliff said the safety of employees and residents was taken very seriously.

"That's why we're looking at ensuring we do have the best management regime at Ashley, but of course training is absolutely important and critical to that," he said.

"As a government we take the circumstances at Ashley extremely seriously, and that's why we've been acting on improving the circumstances at Ashley for many months now."

Leader of the Tasmanian Greens, Cassy O'Connor said the concerns raised by staff needed to be taken seriously.

"They do point to a bigger story of dysfunction at Ashley, and cultural problems that won't be fixed by the modest changes the Minister is talking about," Ms O'Connor said.

"Ashley represents a failed model for youth justice."