PLYMOUTH — Inspectors from the Nuclear Regulatory Commission (NRC) have found apparent violations in the security measures being used to protect the spent fuel storage area on the grounds of the Pilgrim Nuclear Power Station.
The problems were found in early November, according to a Nov. 26 letter to Holtec International, which now owns the plant, from Paul Krohn, the director of the NRC’s Radiological Safety and Security Division. That notification letter is publicly available, but details of the violations are not, because the infractions relate to security, according to the letter.
The inspection examined activities related to Holtec’s physical security plan for the area where radioactive spent fuel rods used during Pilgrim’s five decades of operation are stored in mammoth steel and concrete casks. The inspectors looked at procedures and records, conducted interviews with personnel, and observed security activities.
Based on the results of that inspection, “escalated enforcement action” is being considered, the letter says.
Holtec was given 10 days from Nov. 26 to notify the federal agency of its acceptance of the violation finding or to provide a written response contesting the report. The company could also request a pre-enforcement conference within the 10 days. If the NRC does not hear from Holtec by the deadline, the agency “will proceed with its enforcement decision,” the letter says.
NRC spokesman Neil Sheehan told the Independent by email on Dec. 3 that Holtec had not yet responded. Holtec spokesman Patrick O’Brien said in an email that because the matter is security related he could not comment other than to say, “Our focus remains on a safe and secure decommissioning of Pilgrim Station.”
Detection Limits
The day before the letter was sent, at a meeting of the Nuclear Decommissioning Citizens Advisory Panel, two scientists from the Woods Hole Oceanographic Institution gave updates on their assessments as to where the station’s contaminated wastewater would likely flow if it were to be released into Cape Cod Bay.
Holtec is looking to release the wastewater into the bay after filtering it to reduce contaminants including some of the radioactive isotopes it contains.
Initially, Holtec sought to release 1.1 million gallons of radioactive water. That quantity is now down to about 916,500 gallons because some of it has already been released as evaporation, thanks to heaters Holtec is running during the cold months at the former plant. In spite of public criticism of the release by evaporation, those heaters are now running again, according to Dave Noyes, senior compliance manager for Holtec Decommissioning International.
The state Dept. of Environmental Protection has denied the company an amendment to its water discharge permit required to release the water, saying the state Ocean Sanctuaries Act prohibits it.
Holtec has appealed that decision.
At the November NDCAP meeting, Irina Rypina, a physical oceanographer at WHOI, said her models of the currents in the bay, which factor in the seasons, tides, and wind directions, showed the wastewater has a very high probability of flowing toward Provincetown and then hugging the coastline, affecting Wellfleet on both the bay and ocean sides and Dennis inside the bay.
Based on her study, the wastewater would reach Provincetown within a week of its release and would reach the rest of the bay in three weeks.
“We’re talking about putting radioactive material into the ocean,” said Ken Buesseler, a WHOI marine radiochemist. “I can’t do that from a research vessel, and you could not put this material on a ship and take it to the middle of the ocean and release it. It’s not allowed.”
The wastewater has not yet been treated to filter out contamination. Test samples drawn and analyzed by both Holtec and the state Dept. of Public Health in May 2023 showed the presence of five radioactive isotopes above detection limits: manganese 54, cobalt 60, zinc 65, cesium 137, and tritium.
The results showed those isotopes in “very high numbers relative to the ocean,” Buesseler said. The level of manganese was two million times higher than what naturally occurs in the ocean’s sediment.
Noyes said the company monitors contamination in the sediment, shellfish, finfish, and other marine life.
Buesseler responded that he was not aware of that specific monitoring program but “what I saw were pretty high detection limits, so a ‘no detect’ doesn’t tell me anything as a scientist.”
The dose to humans and sea life will depend on the treatment system used to clean up the wastewater, Buesseler said. He said he thought the dose would likely be low after the water is treated. “You will be able to swim and be able to boat in Cape Cod Bay,” he said. “I never said Cape Cod Bay will be destroyed.” But he said there were better options for dealing with the wastewater than releasing it into the bay.
“Tritium is difficult to get out of water, but if you just cleaned up things that were more harmful, you would be left with water that’s largely tritium, which you could hold for its decay,” said Buesseler.
The plant’s radioactive spent fuel assemblies are now stored in 62 casks on the Pilgrim plant property. “We’re talking about a site where they will have to maintain high-level waste for decades, centuries, and beyond, until we have permanent waste disposal for commercial reactors,” the radiochemist said. If the wastewater were to be treated and then stored on the site, the tritium level would go down to 6 percent in 48 years.
“In 60 years, less than 3 percent would be left,” he said.
