JP5894357B2 - 原子炉内ガンマ線束レベルを決定する装置、システムおよび該装置を備える原子炉 - Google Patents
原子炉内ガンマ線束レベルを決定する装置、システムおよび該装置を備える原子炉 Download PDFInfo
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- JP5894357B2 JP5894357B2 JP2010017527A JP2010017527A JP5894357B2 JP 5894357 B2 JP5894357 B2 JP 5894357B2 JP 2010017527 A JP2010017527 A JP 2010017527A JP 2010017527 A JP2010017527 A JP 2010017527A JP 5894357 B2 JP5894357 B2 JP 5894357B2
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- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- DNYWZCXLKNTFFI-UHFFFAOYSA-N uranium Chemical compound [U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U] DNYWZCXLKNTFFI-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/108—Measuring reactor flux
-
- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
例示的な実施形態では、同軸ケーブル400の特性インピーダンスZOは、内部導電体402の物理的寸法、外部導電体404の物理的寸法、および/または同軸ケーブル400の隙間406のサイズが変化しない場合には、変化することはありえない。しかし、内部導電体402と外部導電体404との間の絶縁誘電体408の誘電定数が変化すると、単位長当たりの分布キャパシタンスCが変化しうるが、単位長当たりの分布インダクタンスLは変化せず同じである。絶縁誘電体408の誘電定数が変化すると、単位長当たりの分布キャパシタンスCが変化し、これにより、上記の式1により特性インピーダンスZOも変化しうる。
単位長当たりの伝搬速度vは、特性インピーダンスZOおよび伝送路の単位長当たりの分布キャパシタンスCに関して表すこともできる。式1と2を組み合わせると、以下の式3が得られる(vの単位はメートル/秒、ZOの単位はΩ、Cの単位はファラッド/メートルである)。
キャパシタは、例えば、絶縁誘電体(例えば、固形物および/またはガス)で隔てられた2本の電極によって定めることができる。絶縁誘電体には、2本の電極の間に電位が印加されたときに発生する電界の影響下で分極を生じうる(例えば、その結果、正の電極と負の電極になる)。絶縁誘電体に分極が生じると、絶縁誘電体内で互いに関して正と負の電荷が再分布し、これにより、絶縁誘電体内の負の電荷は正の電極に向かって変位し、絶縁誘電体内の正の電荷は負の電極に向かって変位する。2本の電極の間の絶縁誘電体の分極により、さらに多くの電気力線が結合され、2本の電極の間の単位面積当たりの電束密度が増大し、これにより、キャパシタに蓄電された電荷が増え、その結果、キャパシタンスが増大しうる。絶縁誘電体の分極の程度が大きければ大きいほど、絶縁誘電体の誘電定数の値が高くなり、その結果、2本の電極の間の単位面積当たりの電束密度が増え、キャパシタンスが増大する。
VTR=全反射信号の電圧振幅 (5)
入射高速リーディングエッジ信号の電圧振幅VIを、全反射信号の電圧振幅VTRから引いて、反射信号の電圧振幅VRを確定することができる。
VR=VTR−VI (7)
VR=反射信号の電圧振幅 (8)
それに加えて、伝送路上の不整合状態のある位置における固有特性インピーダンスZS(Ω)は、以下の式10に従って、伝送路の元の特性インピーダンスZO(Ω)、入射高速リーディングエッジ信号の電圧振幅VI、および反射信号の電圧振幅VRの関数として計算することができる。
ZS=(ZO)*[(VI+VR)/(VI−VR)] (10)
ZS=固有特性インピーダンス(Ω) (11)
同軸ケーブル400の入力端に入射高速リーディングエッジ信号が印加された時点tOから、全反射信号が同軸ケーブル400の入力端に戻った時点tRまでの時間差(ナノ秒、ns)によって、同軸ケーブル400の長さ上のインピーダンス不整合状態の位置からの信号伝搬に対する時間間隔を求めることができる。
図13は、垂直方向出力プロファイルを比較し、ピークおよび/または勾配変化の比較のために原子炉心の底部から約1mのところで正規化された、一緒にプロットされた図10および12のデータを表示するグラフである。観察されうることだが、図12の相対的原子炉出力分布は、図11の相対的原子炉垂直方向出力分布の軌跡を正確にたどり、一致する。
102 原子炉容器
104 格納容器
106 炉心
108 タービン
110 発電機
112 復水器
114 燃料バンドル
116 外部チャネル
118 燃料棒
120 上部タイプレート
122 下部タイプレート
124 スペーサー
126 ウォーターロッド
128 制御ブレード
Claims (8)
- 少なくとも一部が原子炉内で異なる高さに配置された2つまたはそれ以上の導電体と、
前記2つまたはそれ以上の導電体に印加した少なくとも1つの信号と、前記2つまたはそれ以上の導電体から受け取った少なくとも1つの反射信号とに基づいて、前記2つまたはそれ以上の導電体のインピーダンス値を決定し、前記決定されたインピーダンス値に基づいて、前記原子炉のガンマ線束レベルを決定するアナライザーと、
を備え、
前記インピーダンス値の減少は、前記原子炉のガンマ線束レベルの増加と比例し、
前記アナライザーは、印加した前記少なくとも1つの信号の電圧振幅の変化率と、受け取った前記少なくとも1つの反射信号の電圧振幅の変化率との差を求めて、原子炉内のガンマ線束レベルを決定する、
装置。 - 前記2つまたはそれ以上の導電体は、原子炉心内に全体が配置されている、請求項1に記載の装置。
- 前記2つまたはそれ以上の導電体は、同軸ケーブルの一部である、請求項1または2に記載の装置。
- 前記同軸ケーブルは、
内部導電体と、
外部導電体と、
前記内部導電体と前記外部導電体との間に配置された絶縁誘電体と、
充填ガスと、
を備える、請求項3に記載の装置。 - 前記信号を、前記2つまたはそれ以上の導電体に印加し、かつ前記2つまたはそれ以上の導電体から受け取るように構成された1つまたは複数の信号デバイスをさらに備える、請求項1から4のいずれかに記載の装置。
- 前記1つまたは複数の信号デバイスのうちの少なくとも1つのデバイスは、時間領域反射計(「TDR」)を備える、請求項5に記載の装置。
- 請求項1から6のいずれかに記載の装置を備える原子炉。
- 原子炉と、
少なくとも一部が前記原子炉内で異なる高さに配置された2つまたはそれ以上の導電体と、
前記2つまたはそれ以上の導電体に印加した少なくとも1つの信号と、前記2つまたはそれ以上の導電体から受け取った少なくとも1つの反射信号とに基づいて、前記2つまたはそれ以上の導電体のインピーダンス値を決定し、前記決定されたインピーダンス値に基づいて、前記原子炉のガンマ線束レベルを決定するアナライザーと、
を備え、
前記インピーダンス値の減少は、前記原子炉のガンマ線束レベルの増加と比例し、
前記アナライザーは、印加した前記少なくとも1つの信号の電圧振幅の変化率と、受け取った前記少なくとも1つの反射信号の電圧振幅の変化率との差を求めて、原子炉内のガンマ線束レベルを決定する、
原子炉内のガンマ線束レベルを決定するためのシステム。
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