A new report has assessed the feasibility of deploying small modular nuclear reactors to meet increasing energy demands around the world. The findings don't look so good for this particular form of energy production.

[T]he report’s executive summary certainly gets to the heart of their findings.

“The rhetoric from small modular reactor (SMR) advocates is loud and persistent: This time will be different because the cost overruns and schedule delays that have plagued large reactor construction projects will not be repeated with the new designs,” says the report. “But the few SMRs that have been built (or have been started) paint a different picture – one that looks startlingly similar to the past. Significant construction delays are still the norm and costs have continued to climb.”

  • machinin@lemmy.worldOPEnglish
    273·
    4 months ago

    Does anyone know about the technology that nuclear submarines and aircraft carriers use? Why are they able to operate but we can’t use the same technology on land?

    • Poayjay@lemmy.worldEnglish
      44·
      4 months ago

      I was a nuclear operator in the Navy. Here are the actual reasons:

      1. The designs are classified US military assets
      2. They are not refuleable
      3. They only come in 2 “sizes”: aircraft carrier and submarine
      4. They are not scaleable. You can just make a reactor 2x as big
      5. They require as much down time as up time
      6. They are outdated
      7. The military won’t let you interrupt their supply chain to make civilian reactors
      8. New designs over promise and underdeliver
      9. They are optimized for erratic operations (combat) not steady state (normal power loads)
      10. They are engineered assuming they have infinite sea water available for everything

      There’s more but that’s just off the top of my head

    • pelya@lemmy.worldEnglish
      19·
      4 months ago

      Because military engineers overengineer these things from the most expensive materials available, and they also perform frequent maintenance on them, which is also expensive.

      • Nilz@sopuli.xyzEnglish
        14·
        4 months ago

        To add to this: A certain type of Soviet submarine used a lead-bismuth alloy as coolant for their reactor. The coolant solidifies at ambient temperature so it had to be heated indefinitely by some way or another or else it solidified and trashed the reactor. I don’t think any of them exist anymore since Russia wasn’t able to afford sustaining the giant navy after the Soviet collapse.

        Just goes to show how insane nuclear submarine engineering is, or was at some point.

    • mindlight@lemm.eeEnglish
      8·
      4 months ago

      I’m pretty sure they essentially are “one time use” only.

      Extremely simplified:

      They run for 20-30 years without refueling, which means the reactors/system could be built more compact, a higher level of safety and require less maintenance / monitoring / fine-tuning.

      All those parameters are connected in an equation which means if you want higher safety you have to make another parameter “worse”. By making the system “one time use” you set the “refuelability” and “repairability” parameters to the lowest and can therefore up the other parameters.

      Also, military requirements are very different from civilian.

    • SlopppyEngineer@lemmy.worldEnglish
      7·
      4 months ago

      Why are they able to operate but we can’t use the same technology on land?

      Military budgets. You can use the tech, but no civilian can afford it.

    • assassinatedbyCIA@lemmy.worldEnglish
      7·
      4 months ago

      I’m pretty sure most military reactors use weapons grade uranium that’s enriched to mid 90%. Countries get sensitive when you start enriching uranium to the mid 90s.

    • notapantsday@lemmy.worldEnglish
      2·
      4 months ago

      Because if the electricity produced on these vessels was ten times the normal price, it would still be peanuts in the grand scheme of things.