Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Reactor Concept

  1. Jul 25, 2010 #1
    Out of curiosity why do reactor companies patent next generation reactors, while there is more than 20 years to build next generation reactors, the time which patents are expired? Are they wasting money?
     
  2. jcsd
  3. Jul 25, 2010 #2

    Astronuc

    User Avatar

    Staff: Mentor

    Which generation? Generation IV? Most of those are being developed by DOE. The reactors themselves are not patented, but certain unique aspects would be at some point.

    Normally the fine details are not disclosed in the public domain, but rather, the details are trade secrets. Trade secrets do not generally appear in patents.
     
  4. Jul 25, 2010 #3
    For example, all the new small reactors such as IRIS, are in a pressure vessel, that water comes from the side (down comer) and pushed up through the reactor, then turn into steam. Nuscale is also designing a same thing almost. This concept of natural circulation can be copied by anyone since it almost looks like BWR. And they don't have to pay a penalty...
     
  5. Jul 25, 2010 #4

    Astronuc

    User Avatar

    Staff: Mentor

    IRIS has pumps internal to the RPV. So does mpower's system.
    http://www.nrc.gov/reactors/advanced/iris.html

    http://www.westinghousenuclear.com/Our_Company/Research_&_Technology/research_areas.shtm [Broken] (note the research on SiC, in addition to IRIS)

    Natural circulation is not as simple it seems. The crud formation potential is an issue, particularly as it affects the hot channel.
     
    Last edited by a moderator: May 4, 2017
  6. Jul 26, 2010 #5
    Thats is true if you are producing a lot of power but what if you don't choose to produce 1000 MW of power?
    Also I don't know why Nuscale puts the reactor inside water. (Bouncy effect and a lot of stress on the pressure vessel). Do they count the fact that water hammer might happend inside the pressure vessel?
     
    Last edited: Jul 26, 2010
  7. Jul 26, 2010 #6

    Astronuc

    User Avatar

    Staff: Mentor

    Either one uses forced convection, or natural convection. Most designs, even small modular reactors, use forced convection. The exact configuration of the pumps and placement in the RPV varies considerably among the various designs.
    The NuScale design has no valves in the primary circuit, no pumps either, so no water hammer. The head is sufficient to drive natural convection. Bouyancy of the vessel is not an issue, especially with the core intact. The reactor is inside (surrounded by) water in order to remove LOCA as a concern, or at least minimize it.
     
  8. Jul 26, 2010 #7
    Do they install a pump inside the RPV?
     
  9. Jul 26, 2010 #8

    Astronuc

    User Avatar

    Staff: Mentor

    Last edited by a moderator: Apr 25, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Reactor Concept
  1. Reactor Design (Replies: 49)

  2. Nuclear reactor (Replies: 6)

  3. Gallium reactors (Replies: 3)

  4. Nuclear reactor (Replies: 16)

  5. Nuclear Reactor (Replies: 1)

Loading...