The only way the reactors could produce hydrogen gas is if the zirconium fuel rod casing was running way above white heat. No hydrogen is produced unless the fuel bundle is very, very damaged with uranium oxide fuel pellets spilling out inside the reactor. The first hydrogen - air explosions that blew the walls and roofs off the containment buildings happened on day 2, as I recall.
Anyway, that is common knowledge. Most people don’t have common knowledge, unfortunately. Most people don’t think at all.
Most reports - for months - have talked of partial meltdowns - so why is this stuff about technetium being treated as news? A 'new normal' that Japan's soft peddling at a different level of non-truth?