CRITICAL DETECTION DEVICE, METHOD AND PROGRAM

• Main Authors: SHINDO YUTA, YAMAOKA MITSUAKI, UMANO TAKUYA
• Format: Patent
• Language: English; Japanese
• Published: 27.04.2017
• Subjects: MEASUREMENT OF NUCLEAR OR X-RADIATION; MEASURING; NUCLEAR ENGINEERING; NUCLEAR PHYSICS; NUCLEAR REACTORS; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide critical detection technique superior in swiftness and reliability without depending upon state change of an object of detection.SOLUTION: A critical detection device 10 comprises: a first neutron detector 11 which detects a neutron passing a position at a first distance raway from an intersection 54 on a first half-line 51 including the intersection 54 at a rupture position where a molten coagulate 53 of nuclear fuel is ruptured; a second neutron detector 12 which detects a neutral passing a position at a second distance raway from the intersection 54 on the first half-line 51; a third neutron detector 13 which detects a neutron passing a position at the first distance raway from the intersection 54 on a second half-line 52, different from the first half-line 51, including the intersection 54 at the rupture position; and a fourth neutron detector 14 which detects a neutron passing a position at the second distance raway from the intersection 54 on the second half-line 52.SELECTED DRAWING: Figure 1 【課題】検知対象の状態変化に依存することなく、迅速性・信頼性に優れる臨界検知技術を提供する。【解決手段】臨界検知装置１０は、核燃料の溶融凝固物５３を破壊する破壊位置を交点５４とする第１半直線５１上において交点５４から第１距離ｒ1はなれた位置を通過する中性子を検出する第１中性子検出器１１と、この第１半直線５１上において交点５４から第２距離ｒ2はなれた位置を通過する中性子を検出する第２中性子検出器１２と、破壊位置を交点５４とし第１半直線５１とは異なる第２半直線５２上において交点５４から第１距離ｒ1はなれた位置を通過する中性子を検出する第３中性子検出器１３と、第２半直線５２上において交点５４から第２距離ｒ2はなれた位置を通過する中性子を検出する第４中性子検出器１４と、を備えている。【選択図】 図１