what "the power had seized in the plant" means.
The plant lost its connection to the grid?
The grid itself was down?
The plant generates its own electricity from gas and the generator's bearings failed?
Anyhoo, I have been running simulations on a global network of supercomputers and there is a possibility of maintaining gas supply and pressure even when the computers fail. This radical new concept takes the form of a large gas-tight storage cylinder which can telescope vertically. Even when the myriad of excel spreadsheets being used as databases, process control and mission-critical safety monitoring become unavailable, the weight of the gas storage unit's upper section bearing down on the volume of gas below will maintain gas pressure to the consumers until either the problem is resolved or an orderly shutdown can be initiated. Scale the volume of stored gas to the rate of consumption to give the amount of time needed to avoid loss of supply to consumers.
Although the luddites infesting this site will mock this system as unworkable as it fails to use either blockchain or AI, I think it is worth trying wild crazy ideas just in case they work.