Strike action by staff at the Dounreay nuclear plant in Caithness planned for Wednesday has been suspended pending talks between unions and management.
Workers are in dispute with the operators over pay
Workers are in dispute with operators, the UK Atomic Energy Authority (UKAEA), over the current year's pay claim.
Almost 87% of GMB members had backed industrial action and 90% supported an overtime ban at the site.
Previous ballots by two other unions had also shown a substantial majority in favour of industrial action.