Almost certainly. See picture [1]. According to Wikipedia, they're ~87 ft x ~87 ft x ~44 ft = 333k cuft [2]
These reactors are supposed to be a max of 4 containers in size.
So ~12 of them would be ~48 containers = 4x6x2 = ~80 ft x ~60 ft x ~30 ft = 144k cuft.
Though, I doubt you'd want to stack them like that, and I imagine you'd need more than just the reactors to replace the engine.
But more importantly - container ships need space and weight for ~66k gallons of diesel per day - about ~3M gallons total. That's an additional ~401k cuft for diesel, and ~13,500 tons... Each TEU is 22 tons - so you could probably carry an additional 600 TEU (or ~3.5% more).
These reactors are supposed to be a max of 4 containers in size.
So ~12 of them would be ~48 containers = 4x6x2 = ~80 ft x ~60 ft x ~30 ft = 144k cuft.
Though, I doubt you'd want to stack them like that, and I imagine you'd need more than just the reactors to replace the engine.
But more importantly - container ships need space and weight for ~66k gallons of diesel per day - about ~3M gallons total. That's an additional ~401k cuft for diesel, and ~13,500 tons... Each TEU is 22 tons - so you could probably carry an additional 600 TEU (or ~3.5% more).
[1] https://www.amusingplanet.com/2013/03/the-largest-and-most-p...
[2] https://en.wikipedia.org/wiki/W%C3%A4rtsil%C3%A4-Sulzer_RTA9...