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Nuclear update: Three Mile Island shut to repair control rod assembly motor

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Nuclear update: Three Mile Island shut to repair control rod assembly motor

Total U.S. nuclear plant availability recovered a little early Oct. 11 to 88.12%, up from 87.41% on Oct. 10 and still much higher than the 78.93% level posted on the same day last year.

Total output rose despite the loss of Exelon Corp.'s Three Mile Island 1 in Pennsylvania, which "suspended startup activities to address an electrical issue on a control rod assembly motor," senior site communications manager David Marcheski said in an Oct. 11 email. He noted that the system would be repaired and fully tested before the reactor is returned to service. However, due to competitive reasons, no time frame was provide as to when the unit will return. Prior to being taken offline, Three Mile Island 1 was at 54% on Oct. 10

In addition, Entergy Corp.'s Grand Gulf 1 in Mississippi saw output cut from 86% on Oct. 10 to 66% early Oct. 11.

Offsetting the outage and curtailment was increased production at two reactors. The Dominion Energy Inc.'s recently restarted North Anna 2 plant in Virginia was pegged at 48% early Oct. 11, up from 9% on Oct. 10, and Tennessee Valley Authority's Sequoyah 1 unit in Tennessee was operating at 93% early Oct. 11, climbing from 13% on Oct. 10.

For details of U.S. nuclear power plant operations, visit our Nuclear Availability and Status and Outage pages.