In all of these explosions - if Mills CQM is even partially correct - the gradual build-up of below ground state deuterium over time could be risky for a 'runaway'.
Perhaps that is one reason that BLP stays away from deuterium. (there are other reasons) The lesson would be NOT to reuse either electrodes or heavy water between sequential runs with deuterium, especially when they have been exposed to electrolytes that might be catalytic (as defined by either Mills or de Geuss). Fractional deuterium would NOT simply degas from a metal with a magnetic moment, as would ground state, even with applied heat - due to the extreme magnetic field of the fractional species. Very high heat under high vacuum might be required. Due the cost of Pd, there would certainly seem to be a temptation to reuse it in some labs.
