The area in Russia's northern Arkhangelsk region is home to a weapons testing range for the navy.
Russia's Defence Ministry says two people were killed and six others were wounded when a rocket engine exploded during a test. The population of Severodvinsk was 185,000 at the beginning of 2017, according to officials.
"Sensors in Severodvinsk recorded a short-term increase in radiation levels".
Citing data from the Emergencies Ministry, Greenpeace said radiation levels had risen 20 times above the normal level in the city, Reuters news agency reported.
RIA news agency quoted the defence ministry as saying no risky substances had been released into the atmosphere by the explosion of what it called a liquid-propellant rocket engine in the Arkhangelsk region.
The rocket engine explosion occurred at a weapons testing area near the village of Nyonoksa in Arkhangelsk region, the Interfax news agency cited unnamed security sources as saying.
The ministry said there was no release of radioactivity or any toxic substances, but the local administration in Severodvinsk about 30 kilometres east from Nyonoksa reported a brief increase in radiation levels.
A port official said the Dvina Bay area of the White Sea would be closed to shipping.
Officials did not give full details about the size or location of the area that was closed, but it did not appear to include Arkhangelsk itself, a major port for the export of oil products and coal.
The accident is the second to hit the Russian military in less than a week, after a fire broke out in an ammunition depot in Siberia on Monday, causing huge explosions.
Une raison à cela: elle a publié par erreur une vidéo dans laquelle on la voit frapper son doberman et même lui cracher dessus. Lors d'une énième publication, elle voulait le " piéger " en installant du film plastique à la place d'une porte.
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L'établissement lui a aussi indiqué qu'une enquête interne serait ouverte pour découvrir quel salarié aurait agi de la sorte. Je veux qu'ils me remboursent mais, surtout, qu'ils fassent une note pour rappeler les règles " a t-elle clamé au Parisien .
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