Russia confirms radioactive materials involved in blast

MOSCOW — A mystery explosion at a Russian weapons testing range involved radioactive materials, the authorities admitted Saturday, as the blast’s admitted death toll rose and signs of a creeping radiation emergency, or at the least fear of one, grew harder to mask.

In a statement released at 1a.m. Saturday, Russia’s nuclear energy company, Rosatom, said five employees had died, in addition to the two military personnel previously confirmed dead, as a result of a test on Thursday morning involving “isotopic sources of fuel on a liquid pro pulsion unit.”

“A bright memory of our comrades will forever live in our hearts,” the statement said.

The statement, though, shed little light on exactly what detonated Thursday at the White Sea testing range. No use for the propulsion unit was mentioned, although President Vladimir Putin previously boasted that Russia has developed a nuclear engine for longrange missiles. And there was no explanation why the authorities in a nearby city had reported rising radiation levels for a brief period several hours later.

While the government has provided no full explanation of what happened, Rosatom’s statement suggested a mishap during a test of a new class of nuclear-engined weapons that Mr. Putin first spoke publicly about last year.

At the least, the statement came as the first formal acknowledgment from a central government source that radioactive materials had been involved in the accident. It offered no details on the materials used and potentially released into the environment. It said the deaths were “a result of an incident at a testing range in Arkhangelsk region.”

Tass, a state news agency, cited an unnamed official at Rosatom offering additional details and explaining the delay in announcing the additional deaths.

The test occurred on a platform at sea, the news agency reported, and the explosion threw several people into the water. “The search continued as long as hope remained to find survivors,” Tass quoted the official as saying. “Only after this was the announcement made of deaths of five employees.”

With information scarce, residents in cities near the accident site in Russia’s far north were taking no chances. On Friday, there was a run on pharmacies for medicines containing io dine, believed to be of some help against radiation poisoning, the Russian news media reported. Pharmacies in Arkhangelsk reportedly ran out.

A Russian maritime authority, the Administration of Western Arctic Ports, announced Thursday that shipping would be prohibited for a month in Dvina Bay, which is in an area of the White Sea close to the military range where the explosion took place.

Then on Friday, the Russian news media reported that a specialized ship used for collecting and storing liquid nuclear waste from the country’s nuclear-powered icebreaker program had sailed into the area.

The explosion Thursday occurred at a naval weapons testing site near the village of Nenoska, which has been used for missile tests. The nuclear company’s statement did not say whether the explosion or radiation exposure had killed its employees.

Novaya Gazeta, an independent Russian newspaper, interpreted the presence of Rosatom nuclear engineers at the test site as confirming “the version that the military could have been experimenting with the newest rocket with a nuclear power unit.”