A short and small spike of radiation was reported in Severodvinsk on January 28, 2020.
Official explanation is a technical glitch of sensor, but local media reported about a possible emergency on the submarine or in the port.
Another sudden upstick in radiation of 0.3 microsievert per hour was measured in Severodvinsk, Russia, after the city reported values up to 16 times above the natural background after the August 8 nuclear accident in August 2019. 0.3 microsievert per hour is considered a warning setting. Emergency response begins at 0.6 microsievert per hour.
Although still in the ‘green zone’, an emergency troup was directly sent to the site to test the accuracy of the sensor. According to them, the radiation level ranged between 0.09-0.14 microsievert per hour (background) at the time of their arrival on-site. Meanwhile, no further radiation anomalies have been recorded.
According to those results, offiials have determined that the spike in radiation was due to a technical glitch of the sensor.
However, local media reported about a possible emergency in the port.