パッケージフローモデルによる原子炉システム過渡挙動の直感的理解法

An Intuitive understanding method for the dynamic behavior of nuclear reactor systems by package flow models

松岡 浩; 菊池 範子*

Matsuoka, Hiroshi; Kikuchi, Noriko*

原子炉システム内の大域的な熱流動挙動は、「パッケージフローモデル」で簡易に概算ができ、近年の高性能パソコンでは、パラメータの連続変更による瞬時感度解析を通じて安全余裕に関する半定量的な感覚を手元で実感することも可能になった。これは、新型原子炉の概念設計など、専門家が自らの直感や経験に基づく半定量的な感覚を確認し、最適設計を探索する際に役立つ。将来は、局所的な流動解析が得意な「格子ガス法」を組み込むことで、複雑な局所形状等も考慮できる原子炉システム過渡挙動解析手法に発展することが期待される。

A simulation approach by "Package Flow Model (PFM)" was previously proposed, which enables us to intuitively understand the dynamic behavior of various systems. The model does not directly consider the physical process of given actual system, but will replace it a simple visual mechanism (PFM) which is equivalent only in a view point of "time delay" of the system-response. A total system such as a nuclear reactor fluid system is modeled by a combination of several PFMs. Using the PFMs network, we can instantly calculate many transient phenomena of the system even by a notebook-type personal computer. Experts' intuition or experiences can be enhanced by using it with effective representation methods. In addition, PFM method has a capability to develop into an more effective simulation method of total system by including Lattice Gas Methods applied to its subsystems because the calculation processes are in common, i.e., neural networks.