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Public Service Association's general secretary Stewart Little said the union would protect workers at Berrima, Illawarra, Ivanhoe and Brewarrina correctional centres.
"The Public Service Association has secured an undertaking that all affected employees are guaranteed a job if they wish to continue working with Corrective Services," Mr Little said.
"We intend to hold the government to this commitment and ensure that the impact on staff is minimised."
The Southern Highland News has reached out to Minister for Corrections Anthony Roberts office for comment.
Earlier:
Berrima Correctional Centre will close in early 2020.
This comes less than three years after it opened and a year after it was reclassified as a women's prison.
Illawarra Reintegration Centre at Unanderra will also shut as will correctional centres in Ivanhoe and Brewarrina, it was announced on Tuesday.
It is not known how many jobs will be lost from the closure of the correctional centres, however the government has said they will do whatever is feasible to find staff other roles.
In his release, the Corrections minister said the four prisons would be "retired" as "safer beds were available".
Concerns about the potential closure of the Berrima Correctional Centre were raised in June.
Public Services Association acting general secretary Tony Wright said at the time the "government needs to be upfront about what it plans for Berrima jail".
"Prison officers have one of the toughest jobs in the state, uncertainty around the future of their roles at the jail doesn't [make up for] the risk they take," Mr Right said.
"We need the department to consult with us and our members about workforce planning.
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"We are at risk of losing trained professional correction officers in one location and then the state turning around and recruiting people from the street somewhere else."
A Corrective Services NSW spokeswoman said in June no decision had been made to close Berrima "or any older-style prisons".
"Corrective Services NSW is bringing about 5000 new beds online by 2021, as part of the NSW Government's $3.8 billion investment to house the growing prison population," she said.
"The new inmate accommodation will allow us to reduce high-risk beds, which will increase safety and achieve better outcomes.
"We are committed to consulting with staff and the Public Service Association regarding decisions about prison infrastructure."
The closures have been triggered by the new 1700 bed Clarence Correctional Centre, along with the expansion of existing prisons in Junee, Bathurst, Cessnock, Mid North Coast, Parklea and Windsor.