Risk assessment methodology for heat transfer tube failure in a sodium-molten salt heat exchanger for sodium-cooled fast reactor coupled to molten salt thermal energy storage system

溶融塩蓄熱システムにおける熱交換器伝熱管破損に対するリスク評価技術

高野 和也 ; 栗坂 健一 ; 山野 秀将   

Takano, Kazuya; Kurisaka, Kenichi; Yamano, Hidemasa

ナトリウム-溶融塩熱交換器を有する蓄熱式高速炉のリスク評価技術開発の一環として、溶融塩を活用した既存の太陽熱蓄熱発電システムにおける事故トラブル事例結果に基づき、熱交換器における伝熱管破損件数と溶融塩暴露時間を整理するとともに、ベイズ推定手法に基づき伝熱管破損発生率を評価する方法を検討した。

As part of the development of risk assessment technologies for sodium-cooled fast reactor coupled to thermal energy storage (TES) system with sodium-molten salt heat exchanger (HX), the database on the number of heat transfer tube failure in molten salt HX and the exposure time of concentrated solar power (CSP) system to molten salt was surveyed on the basis of reported practices of accidents in the existing CSP systems with the molten salt TES system. Using the database, a risk assessment methodology of the heat transfer tube failure frequency was also studied with a Bayesian estimation method to obtain a risk insight for improving the HX.