JPS6217758Y2 - - Google Patents
Info
- Publication number
- JPS6217758Y2 JPS6217758Y2 JP1980134696U JP13469680U JPS6217758Y2 JP S6217758 Y2 JPS6217758 Y2 JP S6217758Y2 JP 1980134696 U JP1980134696 U JP 1980134696U JP 13469680 U JP13469680 U JP 13469680U JP S6217758 Y2 JPS6217758 Y2 JP S6217758Y2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- filling
- cylindrical member
- rod
- absorption rod
- 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.)
- Expired
Links
- 239000000843 powder Substances 0.000 claims description 20
- 238000010521 absorption reaction Methods 0.000 claims description 15
- 239000008188 pellet Substances 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
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
- Vibration Dampers (AREA)
Description
【考案の詳細な説明】
この考案は、原子炉用制御棒の中性子吸収棒に
おけるB4C充填をB4C粉末とB4C焼結ペレツトと
の組合せ充填によつて、原子炉運転中の流体振
動、制御棒の挿入引抜き動作及びスクラム動作等
によつてB4C粉末が沈降し、これに従つて発生す
るボイドを防止又は分散することにより、制御棒
の核的寿命をのばすことを特徴とする中性子吸収
棒に関する。[Detailed explanation of the invention] This invention uses a combination of B 4 C powder and B 4 C sintered pellets to fill B 4 C in the neutron absorption rod of a nuclear reactor control rod. B 4 C powder settles due to fluid vibration, control rod insertion/extraction operation, scram operation, etc., and the core life of the control rod is extended by preventing or dispersing voids that occur accordingly. This invention relates to a neutron absorption rod.
原子炉制御棒は、燃料集合体の間に下方から挿
入される事により、燃料からの中性子を吸収する
ことにより、炉の停止又は炉出力の制御を司る機
能を有する。この中性子を吸収する物質が制御棒
を構成する吸収棒の中に充填されているB4C粉末
中のB10である。従来B4C粉末は、よく撹拌・乾
燥された大小様々な粉末で、吸収棒中に振動充填
され、規定充填密度が確保されている。又供用中
の制御棒のB4C粉末が沈降した場合、吸収棒の上
端にボイドが集中するのを防ぐため、中間にセパ
レータボールを数個所入れ、そのボールが上下に
移動しないようにボールの両側約13mmの所をかし
め（デインプリング）である。尚、セパレータボ
ール間ピツチは約400mmとしてある。 Reactor control rods are inserted from below between fuel assemblies and have the function of controlling reactor shutdown or reactor output by absorbing neutrons from the fuel. The substance that absorbs these neutrons is B 10 in the B 4 C powder that is packed into the absorption rods that make up the control rods. Conventionally, B 4 C powder is a well-stirred and dried powder of various sizes that is vibrationally packed into an absorption rod to ensure a specified packing density. In addition, if the B 4 C powder from a control rod in service settles, in order to prevent voids from concentrating on the upper end of the absorption rod, several separator balls are inserted in the middle, and the balls are fixed to prevent the balls from moving up and down. It is crimped at about 13mm on both sides. The pitch between the separator balls is approximately 400 mm.
流体振動、制御棒の挿入引抜き及びスクラム動
作等原子炉運転中制御棒のB4C粉末は常に振動を
受け、セパレートボールの直上又は最下端の充填
密度が高くなる。 During reactor operation, such as fluid vibration, control rod insertion and withdrawal, and scram operations, the B 4 C powder in the control rods is constantly subjected to vibrations, and the packing density immediately above or at the bottom of the separate balls becomes high.
即ち、各ボール直下にその分のボイドが発生す
ることになる。又一方、セパレートボールと吸収
棒内径との間隙を通して振動中に微細粉末が落下
する可能性もあつて、その分のボイドは理論的に
最上部に集中することになり、制御棒の核的寿命
を短かくすることになる。 In other words, a corresponding void is generated directly below each ball. On the other hand, there is a possibility that fine powder may fall during vibration through the gap between the separate ball and the inner diameter of the absorption rod, and the voids will theoretically be concentrated at the top, reducing the core life of the control rod. will be made shorter.
この考案は、この最上部ボイド集中傾向となる
欠点をさけることによつて、制御棒の核的寿命を
長くすることにある。即ちセパレートボールの上
下にB4C焼結ペレツトを挿入することによつて、
焼結ペレツトより上のB4C粉末が吸収棒内径との
間隙を極めて落下しにくくすることにある。 The purpose of this invention is to prolong the nuclear life of the control rod by avoiding this disadvantage of the tendency of top void concentration. That is, by inserting B 4 C sintered pellets above and below the separate balls,
The purpose is to make it extremely difficult for the B 4 C powder above the sintered pellet to fall through the gap between the inner diameter of the absorption rod and the inner diameter of the absorption rod.
以下一実施例の図面を参照して本考案について
説明する。 The present invention will be described below with reference to the drawings of an embodiment.
第１図に示す吸収棒断面において、円筒上のチ
ユーブ１内にB4C粉末２を振動充填の後球状のセ
パレートボール３の充填直前に円柱形状のB4C焼
結ペレツト４を挿入し、必要により振動充填す
る。次にセパレートボール充填後B4C焼結ペレツ
ト４ａを挿入し、その後B4C粉末を振動充填す
る。このB4C充填サイクルは単位サイクルを示す
ものであり、この手順を繰返すことによつて吸収
棒全長に亘つてのB4C充填を完了する。尚、チユ
ーブ１の両端部は、スチールウール製のパツキン
６を介してエンドプラグ７にて密封する。 In the absorption rod cross section shown in FIG. 1, after vibrating B 4 C powder 2 is filled into a cylindrical tube 1, a cylindrical B 4 C sintered pellet 4 is inserted just before filling a spherical separate ball 3. Fill by vibration if necessary. Next, after filling the separate balls, B 4 C sintered pellets 4a are inserted, and then B 4 C powder is filled by vibration. This B 4 C filling cycle represents a unit cycle, and by repeating this procedure, B 4 C filling over the entire length of the absorption rod is completed. Both ends of the tube 1 are sealed with end plugs 7 via gaskets 6 made of steel wool.
吸収棒は上下反転して使用しても問題がないよ
うに、中央部から一方へB4Cを充填し、端末処理
後反転して残りの部分にB4Cを充填する。この為
にセパレートボールの上下にB4C焼結ペレツトを
挿入する意義がある。 Fill the absorbent rod with B 4 C from the center to one side so that there is no problem even if it is used upside down, and after treating the ends, turn it over and fill the remaining portion with B 4 C. For this reason, it is significant to insert B 4 C sintered pellets above and below the separate balls.
充填の開始状態を第２図に示すが、チユーブ１
のほゞ中央にかしめ（デインプリング）５を行な
い、セパレートボール３を充填する。次にB4C焼
結ペレツト４を挿入してから、B4C粉末２を振動
充填する。 The starting state of filling is shown in Figure 2.
A caulking (deimpling) 5 is performed approximately in the center of the ball, and a separate ball 3 is filled. Next, B 4 C sintered pellets 4 are inserted, and then B 4 C powder 2 is filled by vibration.
以下上述第１図の説明事項の繰返し充填を行な
う。又反転後の充填状態を第３図に示すが、振動
充填装置に吸収棒を反転してセツトし、先づB4C
焼結ペレツト４ａを挿入し、次にB4C粉末２ａを
振動充填し、以下第１図の説明事項の繰返し充填
を行なう。 Hereinafter, the items explained in FIG. 1 above will be repeatedly filled. Fig. 3 shows the filling state after reversing.
The sintered pellets 4a are inserted, and then the B 4 C powder 2a is filled by vibration, and the filling is repeated as described in FIG. 1 below.
第４図に示すように、セパレートボール３とそ
の上下に挿入されているB4C焼結ペレツト４の間
隙にもB4C粉末を充填することにより、少しでも
ボイドの軽減に役立たせることも有効である。又
反転充填後のB4C焼結ペレツト挿入前にB4C粉末
を充填することによつて、前半充填時に発生した
B4C粉末のブリツジが、反転後何らかの原因によ
り解除された時などに極めて有効である。 As shown in Fig. 4, by filling the gap between the separate ball 3 and the B 4 C sintered pellets 4 inserted above and below it with B 4 C powder, it is possible to help reduce voids even a little. It is valid. In addition, by filling B 4 C powder before inserting the B 4 C sintered pellets after inversion filling, it is possible to eliminate the problems that occurred during the first half of filling.
It is extremely effective when the bridge of B 4 C powder is canceled for some reason after reversal.
又、吸収棒の上、下端にB4C焼結ペレツトを挿
入することにより、尚一層発生するボイドの分散
と制御棒の核的寿命に対して有効になる。即ち制
御棒の最上部のB10濃度の減少が制御棒の核的寿
命に一番影響を与えることから、この効果が得ら
れる。 Furthermore, by inserting B 4 C sintered pellets at the upper and lower ends of the absorption rod, it becomes even more effective in dispersing the voids that occur and improving the nuclear life of the control rod. In other words, this effect is obtained because the decrease in B 10 concentration at the top of the control rod has the greatest effect on the nuclear life of the control rod.
尚セパレートボール及びB4C焼結ペレツトが上
下に移動しないように行なう中央部以外のかしめ
（デインプリング）は吸収棒完成後に行なう。 Note that caulking (deimpring) other than the center part, which is performed to prevent the separate balls and B 4 C sintered pellets from moving up and down, is performed after the absorption rod is completed.
以上説明のように、本考案によれば制御棒の振
動によるB4C粉末の沈降を各セグメント（ボール
とボールの間）毎にボイドを分散させ、制御棒の
核的寿命を延ばす効果が大である。 As explained above, according to the present invention, the sedimentation of B 4 C powder caused by the vibration of the control rod is dispersed in each segment (between the balls), thereby greatly extending the nuclear life of the control rod. It is.
第１図は本考案の一実施例による中性子吸収棒
の断面図、第２図から第４図はB4C充填手順を示
す説明図であり、第２図は中央部から一方へ向つ
て充填する充填開始状態図、第３図は反転後中央
から残分の充填状態図、第４図はセパレートボー
ルとその上下に挿入されるB4C焼結ペレツトの間
にB4C粉末を充填した場合の状態図である。
１……チユーブ、２……B4C粉末、３……セパ
レートボール、４……B4C焼結ペレツト、５……
かしめ、７……エンドプラグ。
Fig. 1 is a cross-sectional view of a neutron absorption rod according to an embodiment of the present invention, Figs. 2 to 4 are explanatory diagrams showing the B 4 C filling procedure, and Fig. 2 shows the filling from the center toward one side. Fig. 3 is a diagram of the state in which the remaining part is filled from the center after inversion, and Fig. 4 is a diagram of the state in which B 4 C powder is filled between the separate ball and the B 4 C sintered pellets inserted above and below it. FIG. 1...Tube, 2... B4C powder, 3...Separate ball, 4... B4C sintered pellet, 5...
Caulk, 7...End plug.
Claims (1)
この円筒部材内に充填されるB4C粉末と、前記円
筒部材内に複数個配置される球状部材と、前記円
筒部材の両端に固定される端栓とからなる中性子
吸収棒において、前記円筒部材内軸方向に球状部
材をはさんで上下に１個づつのB4C焼結ペレツト
を配置したことを特徴とする中性子吸収棒。 a cylindrical member having a plurality of recesses in the axial direction;
A neutron absorption rod comprising B 4 C powder filled in the cylindrical member, a plurality of spherical members arranged in the cylindrical member, and end plugs fixed to both ends of the cylindrical member, wherein the cylindrical member A neutron absorption rod characterized in that one B 4 C sintered pellet is placed on the top and bottom of a spherical member sandwiched in the direction of the inner axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980134696U JPS6217758Y2 (en) | 1980-09-24 | 1980-09-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980134696U JPS6217758Y2 (en) | 1980-09-24 | 1980-09-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5757389U JPS5757389U (en) | 1982-04-03 |
| JPS6217758Y2 true JPS6217758Y2 (en) | 1987-05-07 |
Family
ID=29494885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980134696U Expired JPS6217758Y2 (en) | 1980-09-24 | 1980-09-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6217758Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54163294A (en) * | 1978-06-16 | 1979-12-25 | Hitachi Ltd | Control rod for reactor |
-
1980
- 1980-09-24 JP JP1980134696U patent/JPS6217758Y2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54163294A (en) * | 1978-06-16 | 1979-12-25 | Hitachi Ltd | Control rod for reactor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5757389U (en) | 1982-04-03 |
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