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Salem 2 nuclear plant in Lower Alloways Creek Township, NJ, shut down for the fourth time this month because of a problem with its main generator.

After restarting at 11:36 p.m. Thursday, the reactor had to go off line at 11:07 p.m., Sunday, said Joe Delmar, spokesman for the plant’s operator, PSEG Nuclear.

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Workers are troubleshooting the problem, Delmar said.

The latest shutdown came after an alert from a generator protection system indicated there was an electrical fault.

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The string of plant shutdowns started June 28 when the main generator protection system activated and the plant automatically went off line.

Salem 2 restarted July 3 and then went off line again July 4 when another issue ended up discovered.

On-line again on July 11, the plant was only producing electricity for about seven hours when it shut down after the generator protection system indicated a problem.

The reactor restarted and began sending out electricity over the regional power grid Thursday at 11:36 p.m.

On Sunday at 11:07 p.m. once again there was an indication there was a problem in with the generator and workers took Salem 2 off line.

Each time, operators thought they had solved what was causing the generator protection systems to send out warnings.

Delmar did not know when the plant would come back online.

Salem 2 is one of three reactors operated by PSEG Nuclear at its Artificial Island generating complex in Lower Alloways Creek township.

Salem 1 is currently shut down for replacement of damaged bolts in the reactor core. Hope Creek, the third reactor, is operating at full power.

The three reactors in Salem County comprise the second-largest nuclear generating complex in the United States.

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