並列タイトル等JOYO Start up test report; Measurement of the critical core and full core loading test
一般注記臨界試験高速実験炉「常陽」は昭和52年4月24日初臨界を達成した後,初期炉心を構成するために必要なデータを得るための下記の臨界試験を行った。1)調整棒N-2について,ペリオド法及び未臨界法を用いて全ストロークの反応度曲線を求めた。2)冷却材ナトリウム温度,170$^{\circ}C$から250$^{\circ}C$の範囲の等温反応度係数を測定した。3)炉心周辺の燃料1体の持っ反応度価値を測定した。上記の他に中性子源効果等の臨界測定に関する基礎的な試験を行った。上記の結果はいずれも設計計算値と良く一致し,これらをもとに,初期炉心に必要な追加すべき燃料本数を6本と決定した。初期炉心構成初期炉心への炉心燃料装荷は3ステップに分けて行ない,それぞれのステップで炉心の余剰反応度を確認して,最終段階に於いて炉心燃料本数70本の,50MW定格出力上昇のための初期炉心を構成した。本炉心の持つ余剰反応度は250$^{\circ}C$に於いて2.2\%$\Delta$K/Kで,設計通りの性能を持つものと予想される。
[Measurement of the Minimum critical Core] Following initial criticality, the reactivities necessary for determining the excess reactivity of the power-up core were measured. Only those measurements necessary to provide the minimum required information were made as follows: (1)One regulating control rod worth was measured by using both the period and subcritical multiplication techniques. (2)The isothermal temperature coefficient was measured between 170$^{\circ}$C and 250$^{\circ}$C. (3)Reactivity worth measurements of one core edge fuel assembly were made. In addition to these measurements, the neutron source effects which affect the determination of true critical control rod position were measured. All the measured reactivity. worths described above were in good agreement with design calculations. [Full Core Loading Test] Based on the reactivity worths descrived above, the number of fuel assemblies to be added for the desired excess reactivity was determined. Five fuel assemblies, were added, to the existing core with 65 fuel assemblies (one fuel assembly had already been added to the minimum critical core to measure the edge fuel worth). The initial power-up core with 70 fuel assemblies was achieved after the five assemblies were loaded in three steps, with confirmation of the additional reactivity worth measured after each step. The excess reactivity of the core was measured as 2.2\%$\Delta$k/k at 250$^{\circ}$C.
一次資料へのリンクURL/PNC-TN941-80-58.pdf （fulltext）
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース日本原子力研究開発機構 : JOPSS:JAEA Originated Papers Searching System