Graphite moderator blocks are especially susceptible to this effect, known as Wigner effect, and have to be annealed periodically; the well-known Windscale fire was caused by a mishap during such an annealing operation.
Graphite moderator blocks are especially susceptible to this effect. This effect is known as Wigner effect. Graphite moderator blocks have to be annealed periodically. The well-known Windscale fire was caused by a mishap during such an annealing operation.