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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 鈴木 利明土井 基尾石井 真
- Publication Date
- 1979-12
- Publication Date (W3CDTF)
- 1979
- Alternative Title
- JOYO 75MWt Start-up test report; Calbration of Chromel/Alumel thermocouples used for primary and secondary cooling Systems
- Periodical title
- PNC TN941 79-240
- Target Audience
- 一般
- Note (General)
- 出版タイプ： NA常陽の1次系および2次系の冷却材温度測定にはCA熱電対が用いられている。75MW出力上昇試験において冷却材温度を正確に求めるために検出器,補償導線および計測器を含めた温度計測系としての較正を純金属の冷却特性を利用した温度定点法により実施した。使用した金属は純度99.9999\%の鉛と99.999\%の亜鉛である。▲原子炉出入口,IHX2次側出入口に設置されている熱電対(0.4級)は出力上昇試験用に製作した新しいものであるが,出力上昇試験前における基準値に対する熱起電力の差は亜鉛点(419.6$^{\circ}C$)で-0.3$^{\circ}C$$\sim$+0.6$^{\circ}C$であった。出力上昇試験後にこれらの熱電対について再度較正を実施したところ7体の内2体は正側に,2体は負側にドリフトしていることが明らかになった。残りの3体についてはドリフトはみられなかった。主冷却器出入口の熱電対は6体の内1体を除いて据付時に設置されたものであるが,それらの亜鉛点におけるドリフト量は出力上昇試験開始前にすでに+3.9$^{\circ}C$$\sim$+6.0$^{\circ}C$であった。▲CA熱電対の熱起電力ドリフト現象についてはすでに計測,金属材料,原子力などの研究分野ですでに研究,調査が行われ,確認されている。これらの研究結果および今回の較正結果からみて,正確な温度を長期間にわたって得る場合はCA熱電対は必ずしも適切ではなく,また使用する場合は定期的な較正が必要と考えられる。▲Thermocouples were used to measure the temperature of the sodium in the primary and secondary cooling systems of the JOYO Experimental Fast Reactor during the 75 MW start-up test. The temperature measurement systmes (which consist of the themocouple, the compensating lead wires, and the digital recorder were calibrated by an electrical furnace usinf the melting temperature of a pure metal as a reference. New thermocouples were fabricated for the 75 MW start-up test, and were installed in the reactor vessel and the IHX inlet and outlet lines. Prior to the 75 MW start-up test, calibrations indicated differences from -0.3$^{\circ}$C to +0.6$^{\circ}$C from the standard reference of the freezing point of pure zinc (419.6$^{\circ}$C). After the start-up tests, it was found that two thermocouples drifted in the positive direciton, two thermocouples drifted in the negative direction, and the remaining three thermocouples did not drift. The thermocouples used in the DHX inlet and outlet sodium lines were in use for over three years, except for the one in the A loop DHX outlet which was changed to a new one prior to the 75 MW start-up test. All of the old thermocouples used in the DHXs drifted in a positive direction from +3.9$^{\circ}$C to +6.0$^{\circ}$C at the pure zinc reference temperature (based on pre-test calibrations). Reasons for the drift of the chromel/alumel thermocouples were investigated in the areas of a measurement, a metalic material and a atomic energy. These investigations established the definite occurance of the drift of the thermocouples. These calibration results indicate that chromel/alumel thermocouples are not suitable for long-term use where accurate measurements are required; and if they must be used, periodic calibration is necessary.
- Source
- /PNC-TN941-79-240.pdf （fulltext）