1.Withdraw (something, especially weapons or military equipment) from service.
‘a decision to decommission the ice patrol ship HMS Endurance'
‘West Yorkshire Fire Service has to be notified of any closure of a petrol station so that it can be decommissioned and made safe.'
‘Stripping asbestos insulation off boilers and from fire barriers, decommissioning chemicals and munitions factories, making damaged nuclear reactors safe, and clearing landmines are examples.'
‘If locomotives become too old to maintain, they have to be decommissioned.'
‘Total said it had been in the process of decommissioning the petrol station when the squatters moved in.'
2.Make (a nuclear reactor) inoperative and dismantle it safely.
‘we need to decommission old nuclear power stations'
‘decommissioning was a lengthy, expensive, and potentially hazardous enterprise'
‘The nuclear plant's oldest units, 1 and 2, will be decommissioned by the end of 2002, as was planned.'
‘Regardless of the results of the review, Bulgaria will decommission the two reactors.'
‘The government adopted the position that the reactors should be decommissioned in 2006, but insisted on a safety inspection.'