◆ アメリカの Citroen DS の友人からの手紙 (2011-4-14)
America の Citroen DS の友人からの手紙 (2011-4-14)

前回に引き続いて America からの手紙を紹介しましょう。

◆ 2011-4-4 の手紙の終わりの方に以下の事が書いてありましたので、丁度この問題を書いてあった新聞記事をメイルに添付しました。
 火力発電所では、発生した蒸気で直接タービンを回しますが、原子力発電では放射能から「隔離する」為に「熱交換機」が間にある筈なのに、NHK WORLD ニュースでは「この構造図」が間違って記載されて報道されている、との指摘でした。事実、TMI の断面図では原子炉の中に「熱交換器」が入って描かれています。
 良く調べてみますと、福島原発は 40 年前のアメリカ (GE) 製の最も simple & dangerous Plant であることが解りました。日本の原発の「大部分がこの型」なのです。
 8 年後の Three Mile Island 原発では、改善型の「加圧式」になっているのです!!!


The tour guide explained that the turbine and generator part of TMI is much like that at a coal-fired power plant. One difference is that the water that circulates through the reactor goes into a heat exchanger and the output of this exchanger goes to the turbine. This is for radioactivity isolation in case of a pipe leak or failure inside the reactor. A coal-fired plant would not need to have this isolation.

I describe this because the Fukushima diagram shown on NHK television showed a direct connection of the boiling/pressurized water from the reactor to the turbine. I hope this was a simplification or error by the artist making the diagram and not reality!

c0019483_2025966.jpg


Hello Takashi,

I may have told you when we exchanged messages years ago that I am a retired electronics design engineer. It has been said that we engineers communicate with numbers and drawings, but not by words.
Since I cannot read the Japanese language except that for numbers, I will comment as an engineer on the newspaper illustration you sent me. I have added comments to a copy of it, then scanned it, and attached it to this message. This will show you how well the Internet system works after a double process.


c0019483_20193850.jpg

クリックすると「拡大します」。

I can easily read the dates and map outlines to know the information is about TMI on the left, Chernobyl in the center, and Fukushima on the right. I conclude the 3 diagrams at the bottom were redrawn by the same newspaper artist from separate sources of information. The Chernobyl design is so different, I won't comment on the center diagram. The Fukushima diagram has the same major error as the diagram I saw on NHK television -- it omits the heat exchanger between the reactor and the turbine. One of the newspaper drawings you sent me earlier clearly shows each Fukushima unit has a heat exchanger.

 福島原発などの日本の原発の多くは、造られてから長い期間が経っていて「初期の沸騰水型」なので、タービン建屋が別になってはいますが、原子炉からの「沸騰水=水」は「放射能を持っている」のです。これが今後の「汚染水処理」問題を泥沼化している原因です!それでいて、原発技術では世界一ではあるのですから困った事です。

◆ 改良型原子炉の設置場所と数に付いての Link。株価の高いのと関係がありそうだ・・・ 
 東京電力柏崎刈羽原子力発電所6、7号機、中部電力浜岡原子力発電所5号機、北陸電力志賀原子力発電所2号機の4基となっています。

 私も中部電力、中国電力、九州電力株を「何千株」も持っているのです。

I looked at information on the Internet about the Fukushima power plants soon after the March 11 disaster and know Reactor 1 was made by General Electric about the same time as TMI Reactor 2. That is why I think they are more-or-less the same. I think the newspaper diagrams are based on separate simplifications by separate people.

 Ken が指摘しているのは、Three Mile Island では "Accumulator" のような「加圧タンク」が「原子炉容器」の中にあり、且つ「熱交換機」もその中にあると指摘したいのです。同じ頃に出来た炉であるから同じ筈だとの考えです。
 この件に付いては、私の調べた資料を送りました。それに対する返信は次回に UP-Load 致します。
 正に、この "Accumulator" と彼が名付けた「圧力調整器」は、300 ℃にも成る原子炉内の水の沸点を下げる為に ( 100 bar = 正に Accumulator だ!) 高圧を掛けるためのものでした。


The interesting thing to me on the TMI diagram is the object I've called an "accumulator." (I can not read what it is called on the diagram.) I use the term accumulator because it serves a similar function to the accumulator in our DS high pressure hydraulic system. It contains a compressible gas (nitrogen in the DS, perhaps just air in the reactor system) to absorb most of any pressure variations in the system. The DS accumulator has a diaphragm to separate the fluid and nitrogen. If the similar device in the reactor system is higher in elevation than any other part of the system, they may just rely on gravity for separation and not need a diaphragm.

Three Mile Island is along the Susquehanna River a short distance south of Harrisburg, Pennsylvania. The river flows into Chesapeake Bay which flows into the Atlantic Ocean. The river water is completely fresh (no salt). Between TMI and the bay, there are 2 dams with hydroelectric power plants. There is another nuclear power plant near one of these dams and another along the bay. The river is very wide and very shallow with lots of big rocks. Even people sailing in canoes have to navigate with care.

 私の BLOG に Ken の手紙を掲載しても良いかと尋ねたのですが、大変名誉なことではあるが、 Ken が Citroen DS や原子炉の専門家では無いことを読者に分かるようにして下さいとのことです。

I'm honored that you would want to include me on your blog. I know a lot more about Citroen D-models than about nuclear power plants. Please do not make your readers think I'm an expert on either subject. My approach on most of what I wrote about D-models is tell how I cared for my cars -- not telling others how they should care for their cars.

At the time of the TMI accident, I was manager of research and development of a small company (about 120 employees) here in Reading that designed and manufactured the inside-the-plant voice communications equipment installed in both units at TMI. We were told this equipment worked perfectly during the emergency and there was no need to change to an identical "backup" system or to a third sound-powered (no need for electricity) system. We also were told the changeover of TMI Unit 2 from being a generator of electricity to a consumer (user) at the time of the accident was so fast the lights never flickered.

There is more I could write about, but I will save it for a separate message later.

Regards, Ken



軽水炉 には、 2 種類ある。 Three Mile Island は PWR である。

Pressured Water Reactor. ( PWR )
c0019483_22361058.gif

Boiling Water Reactor ( BWR ) は、日本に多く福島原発はこの Type であり、原子炉の中を通った放射線を含む水が「タービン建屋」に漏れているようだ!タービンの保守、点検で放射能を浴びる危険性がある!!!
c0019483_22402285.gif

電気事業連合会 HP より。
[PR]
by citroenDS | 2011-04-17 20:26 | CitroenDSの意見


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