Failed Bolts Bedevil a Nuclear Plant

U.S. NRC Blog

Neil Sheehan
Public Affairs Officer
Region I

Truly novel issues are, generally speaking, few and far between at U.S. nuclear power plants. Whether it’s a specific type of pipe that springs a leak or an electrical relay that goes on the fritz, chances are good that the problem has been experienced before somewhere across the nation’s fleet of commercial power reactors during the many decades they have been in operation.

An issue that has drawn attention at the Salem Unit 2 nuclear power plant, a pressurized-water reactor in southern New Jersey, has to do with the failure of small bolts contained in four reactor coolant pumps. The bolts, measuring 1 inch in diameter and 4 inches in length, are used to secure a turning vane inside the pumps.

These pumps stand about 30 feet tall and provide forced flow of coolant, or water, through the reactor to transport heat from…

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