Much later, the Institute of Marine Geochemistry at the École normale supérieure claimed that they found traces of plutonium in the river they believed was released in the 1980 or 1969 accident.

[4][5] However, tests conducted in 1993 by the IPSN and in 2003 by the IRSN determined that the levels of plutonium measured upstream and downstream from the power plant were similar and of the same order of magnitude, concluding that the presence of the plutonium was due to the fallout of aerial nuclear tests and not due to either the 1980 or 1969 accidents.

[4] On the morning of 12 January 1987 at 9:30 am, due to the exceptional frost of Loire, ice clogged the water intakes from the central A1 (GCR) and resulted in the loss of normal cooling.

Sortir du nucléaire noted however that when the automatic shutdown of the reactor happened, the control rods remained blocked for unknown reasons.

[10] Plans to build a flood wall around the site were made but abandoned, it is thought, due to the cost.