| Project/Area Number |
07558185
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
エネルギー学一般・原子力学
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
YAMANE Yoshihiro Nagoya University, School of Engineering, Associate Professor, 工学研究科, 助教授 (60115649)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
UNESAKI Hironobu Kyoto University, Research Reactor Institute, Research Assistant, 原子炉実験所, 助手 (40213467)
SHIROYA Seiji Kyoto University, Research Reactor Institute, Professor, 原子炉実験所, 教授 (80027474)
MISAWA Tsuyoshi Kyoto University, Research Reactor Institute, Associate Professor, 原子炉実験所, 助教授 (70219616)
URITANI Akira Nagoya University, School of Engineering, Research Assistant, 工学研究科, 助手 (10213521)
|
|---|
| Project Period (FY) |
1995 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1997: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1996: ¥3,100,000 (Direct Cost: ¥3,100,000)
|
|---|
| Keywords | Position Sensitive Proportional Counter / Eigenvalue Separation / Reactor Stability / Neutron Flux Distribution / Spatial Higher Mode / Adjoint Flux / Time-Sace Correlation / Critical Assembly / 時間相関 / 空間相関 / 随伴関数 / 未臨界度 / 臨界集合体。 |
|---|
| Research Abstract |
The eigenvalue separation is important as an index for evaluating the degree of stability of nuclear reactors. We intend to develop an eigenvalue separation monitor by using spatial integral of neutron flux measured by the position sensitive proportional counter (PSPC). Through this study, the following results were obtained.
(1) It was confirmed from experiments at Kyoto University Critical Assembly that the engenvalue separation can be estimated from the neutron flux measured with a PSPC.The effect of higher modes along the directions not measured must be corrected by numerical calculations.
(2) It was confirmed also from experiments that the eigenvalue separation can be estimated without numerical corrections by solving the coupled equations of neutron flux distributions measured by multiple PSPCs. But, to estimate the engenvalue separations excluding an effect of initial flux distortion, multiple experiments depending on subcriticalities are necessary.
(3) We prepared the system registering simultaneously both a position signal of the PSPC and its arrival time, and investigated ability of time-space correlation measurement.
(4) By adding the nodal method to the previous numerical code on higher modes, we can estimate degenerate eigenvalues with high accuracy.
(5) We confirmed that the spatial dependence of detector efficiency is caused by the variety about manufacturing of anode wire supports.
It was concluded that the eigenvalue separation monitor based on the flux measured with the PSPC can be developed. But more investigations on the applicability to actual nuclear reactors are needed in future. The time-space correlation measurement is expected to be a new method for measuring parameters of reactor dynamics.
|
