Thursday, members of the union's Local 36 picketed the plant, which is in a rural area southwest of Jackson. Entergy said it had to lock the employees out because they would have been working without a contract and could have left their post at any time. Entergy replaced the union members with "experienced" workers from Grand Gulf and from other Entergy nuclear plants as well as professional security firms.
Both sides say they want to resume talks.
In June, 242 union workers at the Pilgrim nuclear power plant in Plymouth, Mass., were locked out when their contract expired, later rejecting an Entergy contract offer. The company and workers signed a new contract that ended the lockout after four weeks. A contract with a separate group of union workers at the Massachusetts plant expires later this month, with more labor unrest possible.