How about this, why don't SK, UK, French and US regulators get together and agree on a common set of regulations for reactor design. Then they can focus on the site specific regulations unique to each installation.
- On one important data transfer, from European module to American, somebody forgot convert units, and software decided to make full halt (to be honest, these things are extremely frequent, but mostly fixed after appear), and this time, unfortunately, this lead to mission loss.
But to be honest, civilian aviation is full of such issues, when appear some critical things, because people erroneous read measuring unit names.
For example, Gimli Glider case, when technicians erroneously read fuel amount in kilograms, but enter something other (their interface accepted centimeters, liters and kilograms and convert automatically), and as consequence, plane was carrying only 45% of it required fuel load. Fortunately, all alive and plane got minimal damage, but this is not always.