the risk of explosion comes not from spraying water but from the brake fire.
you should not spray water on the brake fire because that necessitates going closer or using a rather heavy beam of water.
that's my guess at least.
anyway the picture of the routine operation is described as an Ilyushin 76.
for that plane a procedure may very well exist and no one here knows about it.
as long as you don't use a bucket of water but instead use rather fine mist probably nothing will happen.
@kuobin can't you just ask maintenance what's going on?