APPLICATION OF HEAT PIPE IN NUCLEAR REACTOR

// Omit Closing PHP Tags >?
THE CONCEPT OF HEAT PIPE(S)
October 10, 2020
NUCLEAR MEDICINE – HIGHLIGHT OF SOME SALIENT FACTS
October 10, 2020
Show all

APPLICATION OF HEAT PIPE IN NUCLEAR REACTOR

After the Fukushima Daichi nuclear power plant accident in 2011, there has been an increase on the safety of nuclear reactors and power plants. And the concept of passive safety began to be more and more widely accepted, in other words, passive cooling systems are more potential to enhance plant safety through system reliability and eliminate cost associated with the installation, maintenance and operation of the active cooling system that constitutes numerous electric pumps with independent and dedicated power supplies. For instance, in the new generation nuclear reaction, AP1000, passive cooling technologies are widely adopted and the inherent safety features improves dramatically [1, 2].However, the cooling of Spent Fuel Pool (SFP) has not been taken into full consideration.

在2011年福岛第一核电站事故发生后,反应堆和核电站的安全性有所提高。非能动安全的概念开始被越来越多的人接受,换言之,非能动冷却系统更有可能通过系统可靠性提高电厂安全性,主动冷却系统包含多个需要独立专用电源支持的电动泵,这增加了主动冷却系统安装、维修以及操作的成本,而非能动冷却系统恰恰可以消除所有这些成本。例如,在新一代核反应堆AP1000中,非能动冷却技术被广泛采用,固有安全特性显著提高[1,2],但是,乏燃料池(SFP)的冷却仍然没有得到充分的考虑。

The most recent development of heat pipes has been the application within the nuclear sector. Hybrid heat pipes are used to cool down nuclear reactors and increase the control of the system (Fig. 1). As pointed earlier, the concept of a hybrid heat pipe, that is, the combination of the heat pipe and neutron absorber was proposed to enhance the safety of advanced nuclear power plants. With the unique features of heat pipe and control rod, the hybrid heat pipe can remove decay heat directly from the core as it is inserted into the reactor pressure vessel with the same drive mechanism of a control rod. Furthermore, the actual shut down system in nuclear reactors is composed of a neutron absorber (or rod assembly).

热管的最新发展是在核工业中的应用。混合热管被用来冷却反应堆,同时增加对系统的控制(图1)。如前所述,混合热管(即热管和中子吸收器的结合)的提出,正是为了提高先进核反应堆的安全性。混合热管有着独特的热管结合控制棒的特点,其与控制棒以相同的驱动机理被安装在反应堆压力容器中,这使得混合热管能够直接排出堆芯的衰变热。此外,核反应堆的实际停堆系统由中子吸收器(或棒组件)组成。

Fig.1|Hybrid heat pipes

The function of the rod assembly is to control the nuclear reaction in the reactor core. Raising and lowering the control rods allow operators to control the rate of the nuclear reaction. For emergency cases, the control rod will be lowered by gravity to stop the nuclear reaction and shutdown the reactor. However, this system is limited as far as the Three Miles Island and the Fukushima Daichi nuclear power plant accidents are concerned. Truly, the active cooling system failed to remove the heat decay of the water contained in the reactor, which led to a fusion or melt down of the core, even after the depressurisation of the pressure vessel. In the nuclear reactors, Heat pipe serves as a shutdown device. Investigations of heat pipe technology has been reviewed in [3].The hybrid heat pipe is used for two main purposes. The first is to shut down the reactor in case of accident, and the second is to remove the heat decay generated during the reaction from the core after the shutdown. A passive device that combines the functions of the current control rod assembly and the passive cooling systems could avoid such accidents in the future.

控制棒组件的作用是控制反应堆堆芯内的核反应。控制棒的上升和下降使操作员能够控制核反应的速率。在紧急情况下,控制棒将在重力作用下下降,以停止核反应并关闭反应堆。主动冷却系统在三里岛和福岛第一核电站核事故中体现出了其局限性—事实上,主动冷却系统未能消除事故反应堆的热衰变,从而导致堆芯熔化,即使在压力容器减压后也是如此。在核反应堆中,热管是一种停堆装置。文献[3]对热管技术的研究进行了综述,混合热管主要有两个用途—第一种是在发生事故时关闭反应堆,第二种是在停堆后将反应过程中产生的衰变热从堆芯中排出。将现有控制棒组件和非能动冷却系统的功能结合起来的非能动装置,可以避免将来发生此类事故。

References:

  1. Mochizuki, M., et al., Heat pipe based passive emergency core cooling system for safe shutdown of nuclear power reactor. Applied Thermal Engineering, 2014. 73(1): p. 699-706.
  2. Sutharshan, B., et al., The AP1000TM Reactor: Passive Safety and Modular Design. Energy Procedia, 2011. 7: p. 293-302.
  3. Jeong, Y.S., et al., Hybrid heat pipe based passive in-core cooling system for advanced nuclear power plant. Applied Thermal Engineering, 2015. 90: p. 609-618.

Writer: Emmanuel Osei Tutu (Harbin Engineering University)
Editor: Zhang Chao& Priscilla Oforiwaa
Designers: Zhang Chao& Zhang Jing
Translation : Zhang Chao

iNuclear
清华大学核科学与技术协会
核科学科普官方微信公众号
THUSANSAT
● 微信号WeChat : iNuclear ●
● 网站website:https://www.inuclear.org ●
● 领英LinkedIn:iNuclear ●
● Instagram:info_iNuclear ●
● 推特Twitter:@iNuclear ●

17 Comments

  1. Dorie says:

    If you are going for best contents like myself, only
    pay a visit this web site all the time because it presents quality contents, thanks

  2. Simply wanna state that this is very beneficial, Thanks for taking your time to write this.

    Look into my web-site :: healthy meal plans

  3. As a Newbie, I am continuously browsing online for
    articles that can aid me. Thank you

    Here is my web blog; paleo diet tips

  4. Bernd says:

    We are a bunch of volunteers and opening a brand new scheme in our community.

    Your site offered us with valuable information to work on. You’ve performed a formidable task and our entire community
    shall be thankful to you.

  5. I keep listening to the news update lecture about receiving free online grant applications so I have been looking around for
    the best site to get one. Could you advise me please, where
    could i find some?

    My web page :: diet solution program

  6. Hi, i believe that i noticed you visited
    my web site thus i got here to go back the choose?.I am trying to to find things to improve my website!I
    guess its ok to use some of your concepts!!

    Also visit my web-site; working diets

  7. Right here is the right webpage for everyone who would like to find out about this
    topic. You realize a whole lot its almost tough to argue with
    you (not that I really would want to…HaHa). You definitely put a new spin on a subject that has been discussed for decades.
    Great stuff, just great!

    My web site – http://www.hjzzj.com

  8. I’d always want to be update on new content on this internet site, saved to
    favorites!

    Review my web page :: prettypeople.club

  9. Arnoldo says:

    Ahaa, its nice dialogue on the topic of this paragraph here at this web
    site, I have read all that, so now me also commenting at this
    place.

  10. I think that is among the so much important info for me.
    And i am happy studying your article. But wanna observation on some normal things, The web site style is wonderful, the articles
    is really excellent :D. Excellent task, cheers.

    Here is my site; weight watchers

  11. Wonderful website. Plenty of helpful info here. I’m sending it to some friends ans also sharing
    in delicious. And certainly, thank you in your sweat!

    Also visit my web blog; fat loss diet

  12. Whoah this weblog is excellent i like reading your posts.
    Keep up the great paintings! You recognize, a lot of people are searching around for this information, you could aid
    them greatly.

    Here is my blog post; 23.95.102.216

  13. Very interesting info!Perfect just what I was searching
    for!

    Also visit my homepage seeds require

  14. We’re a group of volunteers and starting a new scheme
    in our community. Your site provided us with helpful information to paintings on. You’ve performed an impressive task
    and our whole neighborhood will probably be grateful to you.

    Here is my web blog … drug rehab centres

  15. I like this web blog so much, saved to bookmarks.

    Here is my web blog; best muscle building supplements

  16. You can certainly see your skills within the article you write.

    The sector hopes for even more passionate writers like you who
    are not afraid to mention how they believe.
    All the time follow your heart.

    Here is my web page … http://www.comegnolaw.com/member/330333

  17. of course like your website but you have to test the spelling on several of your posts.
    Several of them are rife with spelling problems and
    I find it very troublesome to tell the truth then again I’ll surely
    come back again.

    Feel free to visit my blog :: high quality treatment

Leave a Reply

Your email address will not be published. Required fields are marked *