Originally Posted by
rickair7777
Yes H2 will leak... I suspect the only practical solution which could hold up to the rigors of aviation will be a an exterior shell around tanks and probably lines and fittings, which is vented overboard with an appropriate airflow (fan on the ground, ram air when airborne). Not really hard or expensive, but another weight and complexity factor which chips away at the practical utility of H2.
On electrical power plants, once all the leaks are fixed, they do not have leaks in use. That is the more practical solution. They do not use a secondary containment that is vented, as you suggested as a possible solution. Getting them tested and fixed are a real pain, though. It feels like they are chasing spook dust.