Letter to ONR & EDF: Thank you for putting back the restart date of Reactor 4 to the 5th August from the 22nd July. This has made Scotland a safer place to be for an extra 2 weeks. I ask that Reactor 4 and Reactor 3 which is now due to restart on the 1st October be postponed permanently. I have written before and pointed out the weight loss, shrinkage and cracking in the graphite moderator and key structural element of the 2 reactors at Hunterston. I have pointed out the need for super articulated control rods to snake down the now distorted cores and raised the issue of graphite flakes potentially blocking the channels for control rods, cooling gas, information from sensors and the possibility of fuel elements becoming stuck in the core and the likelihood of fuel melt. You have sent me replies to the effect that you have everything under control, have modelled everything and that you would not return the reactors to service if there were any doubts as to their safety .You have written and told me that what happened at Chernobyl could not happen in Scotland as in this instance the Operators were unaware of what was going on in their reactor. So I have been reading your latest ONR Quarterly report on Hunterston B and there’s seems to be an inordinate concern about shuttering on the buildings falling on people from 43 plus year old cladding and not a great deal of concern about this. “During switching of 11kV electrical supplies for Reactor 3, the electrical supply to the gas circulators was lost resulting in loss of forced circulation to the reactor for short period whilst supplies were re-established. Investigations identified that a switch semaphore in the control room had indicated that an interconnector was closed when in fact the interconnector was open resulting in an interruption to electrical supplies when the supplies were switched. Reactor temperatures were monitored throughout the event and all technical specifications continued to be applied. There were no radiological consequences from this event as Reactor 3 has been shut down for a year and the cooling requirements were much reduced.” Now forgive me but this looks like EDF Operators were not aware of what was going on with their Reactor as your control panel was not showing the correct state of the electrical connection to your cooling gas circulators … and that unknowingly the gas circulators had been switched off.
Radiation Free Lakeland 31st July 2019 read more »