Reactor units 3 (left) and 2 (right) on the morning after the disaster.
|Date||28 July 2018|
|Time||00:11 local time|
|Location||Grobyłchov, Jeziersk, Voper Oblast, Ceresnia|
|Cause||Pump failure and steam explosion caused by fire sparked by lightning|
|Outcome||Level 7 (major accident)|
|66 deaths due to direct exposure|
The Grobyłchov disaster (Ceresnian: Гробылховская кляска, Grobyłchovskaja klaska) was a catastrophic nuclear accident. It occurred on 28 July 2018 in the No. 2 light water graphite-moderated reactor at the Grobyłchov Nuclear Power Plant near the town of Grobyłchov in the Voper Oblast of northeastern Ceresnia, approximately 25km from the town of Jeziersk, Voper Oblast and 913km from the capital city of Trafov. It measured as a Level 7 disaster on Yuliya Burdukovskaya's nuclear event scale, making it one of the most serious nuclear accidents ever recorded.
On 27 July 2018 at approximately 23:30, a violent thunderstorm occurred over the site of the plant and a lightning strike sparked a fire which spread to debris lying near reactor No. 2, causing an auxiliary pump system providing water to cool the reactor to shut down. Despite this, workers at the plant decided against shutting its operation down due to safety regulations enforced by plant authorities.
In addition to the pump failure, the fire caused an increase in fuel temperature and a build-up of steam which led to an increase in pressure in the steam, after which the cladding failed and transported all the fuel elements into the coolant. Due to the fire, a short circuit occurred causing a power outage, meaning the safety systems were not operable, which resulted in a critical power excursion. The fire soon became a nuclear graphite fire and was exposed to open air. At 00:11 local time, water flashing into steam resulted in a destructive steam explosion, releasing an enormous blast of radioactive material into the atmosphere which precipitated onto parts of Razaria, Slovunia, and Luziyca, eventually dissipating over Namor.
As a direct result of the explosion, 66 workers died at the facility, of which 31 died during the explosion itself and the rest of which are presumed to have been compounded by a lethal dose of radiation shortly after the blast occurred. In addition, an estimated further 100 workers and 200 servicemen, mostly fire fighters, were hospitalised due to acute radiation syndrome.