9 février 2011
Un défaut a été découvert dans le système de refroidissement à gaz du turbogénérateur TG-4. Le 9 Février 2011, à 02h03, le réacteur à pleine puissance a été connecté au réseau électrique. Suite à une demande, il a été placé sous maintenance d’urgence jusqu’à 02H00 le jour suivant, a annoncé Rosatom. La charge de puissance de l’unité du réacteur 2 de la centrale nucléaire de Smolensk a été réduit de 50 pour cent en raison de l’entretien sur le Turbogénérateur 4 (TG-4).
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Smolensk NPP : Power output remaining halved for 24 hours
Smolensk NPP, Reactor Unit 2 (an RBMK-1000 reactor, commissioned in December 1982 ; engineered lifespan due to expire in 2012) : Turbogenerator switched off the grid on February 9, 2011 ; load reduced to 50 percent. On February 10, the turbogenerator that caused the load reduction was plugged back in following unplanned repairs.
Rosatom’s Crisis Management Centre reports that on February 8, at 11:40 pm, a defect was discovered in the gas cooling system of Turbogenerator TG-4. The reactor was proceeding at a capacity of 1,000 megawatts at the time. At 02:03 am on February 9, the reactor was plugged off the grid and, following a forwarded request, put under emergency maintenance until 02:00 am the following day, Rosatom said.
Just like in the case of Balakovo, Smolensk NPP’s public information service – run, as with all Russian NPPs, by Rosenergoatom’s information department (which, again, does not provide a translated English version of its report on the organisation’s new website) – attempted to whitewash the fact that the load reduction incident was an unforeseen one, stressing, instead, the fact that there was a request for the procedure : “On February 9, in accordance with a forwarded request, power load of Reactor Unit 2 of Smolensk NPP was reduced by 50 percent due to preventative maintenance on Turbogenerator 4 (TG-4).” The report ends with a standard Rosenergoatom statement that “no violations of limits and conditions of safe operation of Kursk NPP power units have been registered.”
Once again, an attempt can be traced to conceal the fact that both the load reduction incident and the repairs of the faulty turbogenerator were unplanned contingencies.
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