JPH0572376A - Weight simulated fuel assembly - Google Patents
Weight simulated fuel assemblyInfo
- Publication number
- JPH0572376A JPH0572376A JP3308618A JP30861891A JPH0572376A JP H0572376 A JPH0572376 A JP H0572376A JP 3308618 A JP3308618 A JP 3308618A JP 30861891 A JP30861891 A JP 30861891A JP H0572376 A JPH0572376 A JP H0572376A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- pellets
- weight
- pellet
- fuel assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
(57)【要約】
【目的】 重量模擬燃料集合体を構成する模擬燃料ペレ
ットの製作に際し、その材料費および加工費を低減す
る。
【構成】 重量模擬燃料集合体を構成する要素である模
擬燃料ペレットを従来の中空部を有するＷペレットに替
って、Ｗペレットとステンレス鋼ペレットなどのタング
ステンより密度の低い異種材料のものを組合わせて、実
際のＵＯ２ペレットのものと重量が合致するよう、上記
Ｗペレット１を例えばステンレス鋼ペレット２とをその
高さを調整して燃料被覆管３に挿入，充填した。
(57) [Summary] [Purpose] To reduce the material cost and processing cost of the simulated fuel pellets that make up the simulated fuel assembly. [Structure] In place of the conventional W pellet having a hollow portion, the simulated fuel pellet, which is an element constituting the weight simulated fuel assembly, is composed of W pellets and stainless steel pellets of different materials having a density lower than that of tungsten. At the same time, the W pellets 1 and the stainless steel pellets 2, for example, were adjusted in height and inserted into the fuel cladding tube 3 so that the weight thereof would match the weight of the actual UO 2 pellets.
Description
【０００１】[0001]
【産業上の利用分野】本発明は二酸化ウラン（ＵＯ２）
燃料ペレットの替りに異種金属を被覆管に挿入，充填し
て、ＵＯ２燃料ペレットを用いた場合と重量を同一にし
た模擬燃料ペレットを用いた燃料棒で構成される重量模
擬燃料集合体に関するものである。なお、重量模擬燃料
集合体とは、実際の燃料集合体では、燃料棒内にＵＯ２
などの核燃料物質からなる燃料ぺレットを多数充填して
いるのに対し、このような燃料ペレットの替りに全体の
重量が同一となるように製作した模擬ペレットを被覆管
に挿入，充填したもので、それ以外は実際の燃料集合体
と同一の構造，材質を有したものである。この重量模擬
燃料集合体は燃料としての取扱いや輸送実験など種々の
用途に用いられている。また、図３は加圧水型原子炉用
燃料集合体Ａの簡略説明図でＲ０は燃料棒を示す。FIELD OF THE INVENTION The present invention relates to uranium dioxide (UO 2 ).
Regarding a weight-simulated fuel assembly composed of fuel rods using simulated fuel pellets having the same weight as when UO 2 fuel pellets are used by inserting and filling dissimilar metals in the cladding tube instead of fuel pellets Is. It should be noted that the weight simulated fuel assembly is an actual fuel assembly in which UO 2 is contained in the fuel rod.
While a large number of fuel pellets made of nuclear fuel substances such as the above are filled, simulated pellets manufactured to have the same overall weight instead of such fuel pellets are inserted and filled in the cladding tube. Other than that, it has the same structure and material as the actual fuel assembly. This weight-simulated fuel assembly is used for various purposes such as handling as a fuel and transportation experiments. Further, FIG. 3 is a simplified explanatory view of a fuel assembly A for a pressurized water reactor, and R 0 is a fuel rod.
【０００２】[0002]
【従来の技術】従来、重量模擬燃料集合体燃料棒の模擬
ペレットの製作においては、図２に示すような中空部１
１を設けたタングステン（Ｗ）ペレット１０を被覆管内
に充填していた。これはＷペレットの密度がＵＯ２ペレ
ットの密度よりも大きいため、Ｗペレットに中空部１１
を設けて、その重量を合致させていた。中空部の径のペ
レット外径との割合ｒはＵＯ２およびＷの密度がそれぞ
れ１０．２６ｇ／ｃｍ３，１９．２８ｇ／ｃｍ３である
ので （１−ｒ２）×１９．２＝１０．２６ ∴ ｒ＝０．６８２ つまり、ペレットの直径の６８．２％の径の中空部を有
するペレットを製作することになる。従って、この方法
ではＷの材料費が２５円／ｇと高いこと、および加工コ
ストが増大することが問題とされている。また、Ｗ−Ｃ
ｕの混合粉末の焼結によりペレットを製作することもあ
るが、やはり製作コストが大きくなりすぎるという問題
点があった。2. Description of the Related Art Conventionally, in the production of a simulated pellet of a fuel rod for a weight simulated fuel assembly, a hollow portion 1 as shown in FIG.
The tungsten (W) pellet 10 provided with No. 1 was filled in the cladding tube. This is because the density of the W pellets is higher than that of the UO 2 pellets.
Was provided to match the weight. Ratio of the pellet outer diameters of the hollow portion r is UO 2 and W densities respectively 10.26 g / cm 3, and since it is 19.28g / cm 3 (1-r 2) × 19.2 = 10. 26 ∴ r = 0.682 That is, a pellet having a hollow portion having a diameter of 68.2% of the diameter of the pellet is manufactured. Therefore, this method has problems that the material cost of W is as high as 25 yen / g and the processing cost is increased. Also, WC
Pellets may be manufactured by sintering the mixed powder of u, but there is a problem that the manufacturing cost becomes too high.
【０００３】[0003]
【発明が解決しようとする課題】本発明の目的は、模擬
ペレットの製作に対して材料費の低減および加工費の節
減を図ることである。SUMMARY OF THE INVENTION It is an object of the present invention to reduce the material cost and the processing cost for manufacturing a simulated pellet.
【０００４】[0004]
【課題を解決するための手段】本発明は上記の目的を達
成するためになされたもので、Ｗペレットを中空加工せ
ず、Ｗ丸棒をジルカロイ−４燃料被覆管に挿入，充填す
ると共に、燃料棒１本の重量を模擬するために、Ｗより
密度の低い異種材料、例えばステンレス鋼丸棒とを前記
の丸棒と順次交互に連続して配置することにより、１本
の重量模擬燃料棒を構成する。異種材料としてステンレ
ス鋼丸棒を使うとすると １９．２ｘ＋７．９ｙ＝１０．２６ ｘ＋ｙ＝１ 但し ｘはＷ丸棒の比率 ｙはステンレス鋼捧の比率 ここで、ＵＯ２の密度は１０．２６ｇ／ｃｍ３ Ｗ の密度は１９．２ ｇ／ｃｍ３ ステンレス鋼の密度は ７．９ ｇ／ｃｍ３ である。 ∴ Ｗ丸棒（ｘ）：ステンレス鋼棒（ｙ） ＝０．２０８８：０．７９１２ 模擬ペレットの燃料棒被覆管への充填方法および個々の
ペレット長は使用方法に応じ任意とする。但し模擬ペレ
ットの外径は実際の燃料ペレットと同一にする。SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, in which a W round bar is inserted into and filled in a Zircaloy-4 fuel cladding tube without hollow machining of W pellets. In order to simulate the weight of one fuel rod, a dissimilar material having a density lower than W, for example, a stainless steel round rod is sequentially and alternately arranged with the above-mentioned round rod, so that one weight-simulating fuel rod is formed. Make up. If a stainless steel round bar is used as a different material, 19.2x + 7.9y = 10.26 x + y = 1, where x is the ratio of W round bar y is the ratio of stainless steel, where the density of UO 2 is 10.26g / The density of cm 3 W is 19.2 g / cm 3 and the density of stainless steel is 7.9 g / cm 3 . ∴ W round bar (x): Stainless steel bar (y) = 0.2088: 0.7912 The method of filling the simulated pellets into the fuel rod cladding tube and the length of each pellet are optional depending on the method of use. However, the outer diameter of the simulated pellet is the same as the actual fuel pellet.
【０００５】[0005]
【作用】模擬燃料ペレットの製作にＷ丸棒，ステンレス
鋼丸棒を用いるので、Ｗペレットだけの場合のように中
空部を設ける必要がなく、材料費，加工費とも節減でき
る。Since the W round rod and the stainless steel round rod are used for manufacturing the simulated fuel pellet, it is not necessary to provide a hollow portion as in the case of only the W pellet, and the material cost and the processing cost can be reduced.
【０００６】[0006]
【実施例】図１に本発明に係る重量模擬燃料棒（全長約
４ｍ）Ｒ１の実施例を示して説明する。Ｗペレット（Ｗ
丸棒）１とステンレス鋼ペレット（ステンレス鋼丸棒）
２とが交互に燃料被覆管３内に挿入，充填される。なお
４は下部端栓、５，６はスプリング、７は上部端栓であ
る。上述のような模擬燃料棒Ｒ１を燃料集合体１体の必
要数を製作し、該模擬燃料棒を組込んで重量模擬燃料集
合体を構成する。なお、燃料棒の重量のみならず、重量
分布および重心の位置を大体一致させるために、比較的
高さの低い、例えば１０ｍｍのＷペレット１と高さの高
いステンレス鋼ペレット２を交互に燃料被覆管３内に挿
入，充填する。この場合ステンレス鋼ペレット２の高さ
は ０．７９１２／０．２０８８×１０＝３７．９ｍｍ となる。模擬ペレットの材質の一つは、上記ではステン
レス鋼としたが、Ｗより密度が低い材料で、かつ重量模
擬燃料集合体の取扱い条件下で、燃料被覆管との共存性
を満たす材料であれば、この他にもＮｉ基合金あるいは
その他の金属材料やもしくはセラミック材料であっても
良い。EXAMPLE FIG. 1 shows an example of a weight-simulating fuel rod (total length of about 4 m) R 1 according to the present invention. W pellet (W
Round bar) 1 and stainless steel pellets (stainless steel round bar)
And 2 are alternately inserted and filled in the fuel cladding tube 3. 4 is a lower end plug, 5 and 6 are springs, and 7 is an upper end plug. A required number of one fuel assembly of the above-described simulated fuel rod R 1 is manufactured, and the simulated fuel rod is incorporated to form a weight simulated fuel assembly. Not only the weight of the fuel rods, but also the weight distribution and the position of the center of gravity are roughly matched to each other. Insert into tube 3 and fill. In this case, the height of the stainless steel pellet 2 is 0.7912 / 0.2088 × 10 = 37.9 mm. Although one of the materials for the simulated pellets is stainless steel in the above, as long as it is a material having a density lower than W and satisfying the coexistence with the fuel cladding tube under the handling condition of the weight simulated fuel assembly. Other than this, a Ni-based alloy or other metal material or ceramic material may be used.
【０００７】[0007]
【発明の効果】加圧水型原子炉用燃料集合体（１７×１
７型）を例にとると、燃料棒の総数は２６４本で、全Ｕ
Ｏ２重量は５０２３９２ｇである。全てＷペレットを挿
入した場合の材料費Ｗは、２５円／ｇとして１２５６０
千円となり、Ｗとステンレス鋼の混合比で挿入した場合
の材料費はＷが ２５円／ｇ×５０２３９２×０．２０８８＝２６２２千
円 ステンレス鋼が ０．９円／ｇ×５０２３９２×０．７
９１２＝３５８千円 従って 合計 ２９８０千円となり、 １２５６０千円−２９８０千円＝９５８０千円 と安価になる。その中空ペレットにする加工が不要とな
るため、製作費低減効果は更に大きいものとなる。EFFECT OF THE INVENTION Fuel assembly for pressurized water reactor (17 × 1)
7 type), the total number of fuel rods is 264, and the total U
The O 2 weight is 502392 g. Material cost W when all W pellets are inserted is 25560 yen / g 12560
Thousands of yen, and the material cost when inserting it with the mixture ratio of W and stainless steel is 25 yen / g × 502392 × 0.2088 = 2622,000 yen for stainless steel 0.9 yen / g × 502392 × 0.7
912 = 358 thousand yen Therefore, the total will be 2980 thousand yen, and it will be cheap as 12560 thousand yen-2980 thousand yen = 9580 thousand yen. Since the processing to make the hollow pellets is not necessary, the effect of reducing the manufacturing cost is further increased.
【図１】本発明の重量模擬燃料集合体を構成する燃料棒
の一実施例説明図である。FIG. 1 is an explanatory view of an embodiment of a fuel rod which constitutes a weight simulated fuel assembly of the present invention.
【図２】本発明を使用しない従来の模擬燃料棒を構成す
る燃料ペレットの説明図である。FIG. 2 is an explanatory diagram of fuel pellets constituting a conventional simulated fuel rod that does not use the present invention.
【図３】加圧水型原子炉用燃料集合体の簡略説明図であ
る。FIG. 3 is a simplified explanatory view of a fuel assembly for a pressurized water reactor.
１ Ｗペレット ２ ステンレス鋼ペレット ３ 燃料被覆管 Ｒ１ 模擬燃料棒 Ｒ０ 燃料棒1 W pellet 2 Stainless steel pellet 3 Fuel cladding tube R 1 Simulated fuel rod R 0 Fuel rod
Claims (1)
ペレットとして中空部を有しないタングステンペレット
とステンレス鋼などのタングステンより密度の低い異な
る材料からなるペレットを被覆管に挿入，充填した燃料
棒で燃料集合体を構成し、その重量を実際の燃料集合体
と一致させたことを特徴とする重量模擬燃料集合体。1. A fuel rod in which a tungsten pellet having no hollow portion and a pellet made of a different material having a density lower than that of tungsten such as stainless steel are inserted and filled in a cladding tube as a simulated fuel pellet for a fuel of a weight simulated fuel assembly. A weight-simulated fuel assembly characterized in that a fuel assembly is constituted by and its weight is made to match the actual fuel assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3308618A JPH0572376A (en) | 1991-09-11 | 1991-09-11 | Weight simulated fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3308618A JPH0572376A (en) | 1991-09-11 | 1991-09-11 | Weight simulated fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0572376A true JPH0572376A (en) | 1993-03-26 |
Family
ID=17983219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3308618A Withdrawn JPH0572376A (en) | 1991-09-11 | 1991-09-11 | Weight simulated fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0572376A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2044593B1 (en) * | 2006-07-22 | 2014-03-26 | AREVA GmbH | Device for removing solid particles from the cooling medium circulated in the primary circuit of a nuclear reactor |
| JP2017096758A (en) * | 2015-11-24 | 2017-06-01 | 三菱重工業株式会社 | Simulation pellet, simulated fuel rod, and simulated fuel assembly |
| CN107630162A (en) * | 2016-07-18 | 2018-01-26 | 自贡硬质合金有限责任公司 | A kind of preparation method of WC alloys pellet |
-
1991
- 1991-09-11 JP JP3308618A patent/JPH0572376A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2044593B1 (en) * | 2006-07-22 | 2014-03-26 | AREVA GmbH | Device for removing solid particles from the cooling medium circulated in the primary circuit of a nuclear reactor |
| US8705685B2 (en) | 2006-07-22 | 2014-04-22 | Areva Gmbh | Device for removing solid particles from the cooling medium which circulates in the primary circuit of a nuclear reactor |
| JP2017096758A (en) * | 2015-11-24 | 2017-06-01 | 三菱重工業株式会社 | Simulation pellet, simulated fuel rod, and simulated fuel assembly |
| CN107630162A (en) * | 2016-07-18 | 2018-01-26 | 自贡硬质合金有限责任公司 | A kind of preparation method of WC alloys pellet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19981203 |