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View Diary: Big Trouble In Arkansas w/Update (246 comments)

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  •  Entergy lies like I breathe aire; ask any NH\VT'r (5+ / 0-)
    Recommended by:
    StrayCat, Joieau, SadieSue, Eyesbright, patbahn

    And wtf does "scram" mean in the context used [please...]

    Evidence that contradicts the ruling belief system is held to extraordinary standards, while evidence that entrenches it is uncritically accepted. -Carl Sagan

    by RF on Wed Apr 03, 2013 at 05:36:24 PM PDT

    •  Scram... (7+ / 0-)

      ... is just an industry term for an emergency shutdown of the reactor, iirc.

      •  And the worst thing that can happen is..... (5+ / 0-)
        Recommended by:
        Joieau, Eyesbright, patbahn, KenBee, SadieSue

        ....unanticipated transient power surge without SCRAM.....

      •  A scram is an emergency-triggered (13+ / 0-)

        shutdown. This reactor was at 100%, it can happen at any critical power level. Shutting down a reactor for a planned outage is a whole other process, and it's not very hard on the hardware of the plant. Emergency scram from power is very hard on the hardware of the plant.

        Luckily these plants are pretty tough, since they have to do this far more often than they were originally designed to tolerate. They are not unbreakable, and they are not indestructible.

        A full-power operating reactor needs some considerable time with full RCS plumbing (including at least two pumps) to bring the decay heat level to something not in immediate danger of meltdown. ANO's number 2 reactor hasn't enjoyed this luxury, because its EDGs are apparently not able to power the RCS pumps. It is depending on "convection cooling," and has been depending on that since it scrammed. That's way, way outrageous and ultimately scary. To me, and I was once a nuke. These aren't anything new, since engineering designs haven't changed in at least 50 years.

        If it worries me, it should definitely concern people living in the plume path. This is sort of a gentle warning that if the helicopters haven't spooked you yet, the newly-deployed evacuation route signs should spook you. Get the hell outta there for awhile.

    •  It is believed by some to originally mean (6+ / 0-)
      Recommended by:
      RF, Pompatus, Joieau, Eyesbright, patbahn, Sandino

      "Situation Critical,  Reactor Axe Man" back when there was a guy standing with an axe to cut the rope (which was manually pulled up) holding the moderator rods (which when fully inserted shut down the reactor) up.  Nowadays it just means a full emergency shutdown which is only used in an emergency as it often causes damage to the reactor that while not dangerous is very expensive to repair.  You know, like the big red switch in server rooms and industrial plants that kills all the power to every piece of equipment when pressed?

      You have watched Faux News, now lose 2d10 SAN.

      by Throw The Bums Out on Wed Apr 03, 2013 at 06:11:41 PM PDT

      [ Parent ]

      •  You don't need whole coolant (3+ / 0-)
        Recommended by:
        Eyesbright, Sandino, KenBee

        circulation systems powered by multi-megawatt bigger-than-freight-train EDGs to carry away residual heat in your basic OFF switch situation if the boiler's got a relief valve. Two minutes flat, the thing's below 100º C. You can't just throw water on this kind of fire and vent the steam. It keeps right on burning. For days/weeks/years/forever.

        Really.

        •  Well in those bad old days the reactors were (2+ / 0-)
          Recommended by:
          Eyesbright, Joieau

          air cooled (that's right, no cooling.  just one guy to pull the rods up by hand using a pulley system and another with an axe to lower them in case of emergency) though they weren't run for very long and didn't produce electrical power.

          You have watched Faux News, now lose 2d10 SAN.

          by Throw The Bums Out on Wed Apr 03, 2013 at 07:27:06 PM PDT

          [ Parent ]

          •  And we can applaud the Progress (1+ / 0-)
            Recommended by:
            Just Bob

            that figured out boiling water was more useful than simply stacking the bricks in a Chicago university gymnasium to see if we could light a fire.

            Honestly. That is such monumental garbage. We're done with that whole Atoms for Peace "too cheap to meter" bullshit. Have been for awhile now, in case you hadn't noticed.

      •  more likely hit the rods and scramble (1+ / 0-)
        Recommended by:
        Joieau

        out of the pile room before it blows

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