STATION bosses have welcomed a decision by nuclear regulators to allow reactor 4 of Hunterston B to be switched back on – after it was found it could still withstand an earthquake. The Office for Nuclear Regulation (ONR) say Reactor 4 at Hunterston B power station is safe to return to service for approximately six months. ONR’s assessment focussed on whether cracking observed in the graphite bricks that form the reactor core could compromise its fundamental nuclear safety requirements. They found unimpeded insertion of control rods and unimpeded movement of fuel; ensuring that gas flow will be maintained to ensure cooling; and that appropriate moderation (slowing neutrons to sustain the nuclear chain reaction) and thermal inertia (reducing the speed of temperature changes) are maintained.
Largs & Millport Weekly News 10th Oct 2020 read more »