Bechtel National laid off five pipefitters who completed work on a short-term project at Hanford.
The contractor announced this week that it was hiring about 50 building trades workers at the vitrification plant, and they were to start work Monday.
Bechtel spokesman Todd Nelson said Thursday that Bechtel had hired all the pipefitters it was planning to hire for now.
The five temporary jobs involved transporting pipe from a warehouse near the Hanford vitrification plant project to one in Yakima, Nelson said.
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Employees who worked less than 30 days would retain their place near the top of the union hiring list, while those who worked more than 30 days go to the back of the line, he said. Bechtel lets the union know how many openings it has available, then the union sends the workers.
"The length of part-time jobs on that project varied, so some worked longer than others," he said.