In a plant manufacturing egg-based powders for animal feed, a gas-fired boiler which has just been repaired explodes shortly after it is put back into service and a fire develops on a drying tower. The energies are immediately cut off at the site and the emergency services are alerted. To avoid pollution, thermal oils are collected in a sewage pit; They will subsequently be evacuated by an outside operator. No casualties are reported, but a packing workshop is destroyed and 6 employees are technically unemployed. An appraisal must determine the causes of the disaster.