PLYMOUTH — With less than two weeks left until its scheduled permanent shutdown, Pilgrim Nuclear Power Station is limping toward the finish line.

The reactor was shut down Friday night after one of the plant’s two circulating seawater pumps was knocked offline. The reactor remained in hot shutdown Monday, at “zero” power, while operators worked on the pump system.

Information related to if or when Pilgrim would go back online is considered “market sensitive” and therefore not disclosed, but the reactor’s current status is an indication it will likely power back up for its final 10 days.

“When a nuclear power plant is in ‘hot shutdown,’ that means the reactor and reactor coolant system are kept heated and pressurized, allowing for a fairly quick return to service,” said Neil Sheehan, speaking for the Nuclear Regulatory Commission.

Patrick O’Brien, spokesman for Entergy, Pilgrim’s owner-operator, said Monday that the problem was related to one of three electrical cables that connect to the pump. He said the electrical connection was repaired.

The pump is designed to draw seawater from Cape Cod Bay and circulate it through a network of tubes in the condenser to cool down steam produced by the reactor and used to spin the turbine to create electricity.

“Safety remains our No. 1 priority as we continue toward our final shutdown on May 31,” O’Brien wrote in an email.

Mary Lampert, president of a citizens group called Pilgrim Watch and a longtime plant critic, said it was at least good news that no mishaps occurred as the reactor was shut down for repair.

“It would be the irony of all ironies if, with only 11 days to go, we had a big problem,” she said.

The Plymouth plant has been plagued by equipment problems during its 46 years of operation. The reactor was under a federally ordered shutdown for nearly three years, from April 1986 to January 1989, for equipment and management failures while owned by Boston Edison.

Entergy Corp. bought the plant from Edison in 1999 for $80 million.

Because of frequent mechanical and management issues, the Nuclear Regulatory Commission downgraded Pilgrim to Column 4 on the federal performance matrix in September 2015, making the plant the worst performer in the country and one step from mandatory shutdown.

Entergy announced a month after the downgrade that it planned to shut Pilgrim permanently on May 31, 2019, because it was a financial loser — annually running in the red by about $30 million.

Plant performance in 2018, its final full year of operation, likely put it deeper into the red. The reactor was at “zero” power for about 60 days because of unplanned shutdowns related to equipment problems. The shutdowns would have cost the company about $63 million in gross revenue and $32 million in net revenue.

Its Column 4 status also cost Pilgrim some cash in 2018. The price tag for about 5,600 hours of special inspections and assessments connected to Column 4 last year was more than $1.5 million, at the Nuclear Regulatory Commission’s hourly rate of $275.

Despite the plant’s 2018 performance, the commission moved Pilgrim back to Column 1, where plants receive only basic oversight, in March, saying Pilgrim operators had successfully addressed the 156 deficiencies that landed it in Column 4.