第16回
FRPの健全性診断に向けた非破壊検査システム開発
著者:
藤吉 宏彰,石井 元武,礒部 仁博,(原燃工),川島 崇利,(関西電子ビーム),浦島 千裕,岡 隆之,鈎 忠志,(関西電力)
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Fiber reinforced plastic (FRP) is used in a wide range of applications due to its light weight, high strength, excellent corrosion resistance and flexible processability. Although nuclear power plants may have a chance to use FRP as structural and equipment materials in the future, its radiation effect is not well known so far. Thus, we tried to evaluate its radiation degradation non-destructively using "AE (Acoustic Emission) digital hammering inspection". Two types of FRP test specimens of glass fiber and...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of FRP
第15回
ROPの導入と事業者が果たすべき役割
著者:
爾見 豊,(関西電力)
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US regulatory inspection program ROP (Reactor Oversight Process) is successfully being operated for almost two decades. Japanese Nuclear Regulation Authority (NRA) decided to introduce very similar process into Japanese inspection system from 2020. For achieving safety and reducing unnecessary burden at the same time, ROP is designed to fully utilize risk informed schemes in its components, i.e. sampling of the inspection items, determining importance of the inspection findings, regulating the strength o...
英字タイトル:
Features of ROP and expected changes in Licensee’s activities
第17回
WJPとバフ研磨による残留応力改善工法の 応力緩和挙動のメカニズム検討
著者:
于 麗娜,才田 一幸,西本 和俊,(大阪大),千種 直樹,(関西電力)
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The relaxation behavior of the compressive stress in nickel-based alloy 600 introduced by WJP and buffing stress improving treatments has been investigated. Hardness reduction behavior in WJP and buffing processed samples during thermal aging has been found to follow the Johnson-Mehl-Avrami equation and the rate constant for hardness reduction to be expressed by the Arrhenius equation. EBSD crystal orientation analysis has confirmed that the strain is introduced mainly in the surface region. Positron lifeti...
英字タイトル:
Mechanism for stress relaxation behavior of WJP and buffing stress improving treatments
第15回
ケーブル絶縁材の健全性診断に向けた非破壊検査システム開発
著者:
藤吉 宏彰,礒部 仁博,(原燃工),川島 崇利,(関西電子ビーム),浦島 千裕,鈎 忠志,(関西電力)
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Insulation degradation of cable insulation causes fire due to electric leakage. Cable insulating materials laid in nuclear power plants deteriorate over time, heat and influence of radiation. Here we investigated the degradation tendency of insulating materials by radiation irradiation by hammering inspection using AE sensor. As a result, for any cable insulation material, curing of insulating material with irradiation could be detected as a change in natural frequency. From here, the applicability of AE ha...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of cable insulating material
第16回
ケーブル絶縁材の健全性診断に向けた非破壊検査システム開発(2)
著者:
石井 元武,藤吉 宏彰,礒部 仁博,(原燃工),川島 崇利,(関西電子ビーム),浦島 千裕,岡 隆之,鈎 忠志,(関西電力)
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We reported previously the deterioration tendency of cable insulation materials used in nuclear power plants due to irradiation and the applicability of AE (Acoustic Emission) digital hammering inspection to detect the deterioration nondestructively by comparing the natural frequencies before and after the irradiation. In this study, we selected two kinds of triple core cables which are often utilized in nuclear power plants. The natural peak frequency increased due to the increase of irradiation dose, and ...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of cable insulating material (2)
第17回
ケーブル絶縁材の健全性診断に向けた非破壊検査システム開発(3)
著者:
石井 元武,藤吉 宏彰,礒部 仁博,(原燃工),川島 崇利,(関西電子ビーム),冨宅 ゆかり,藤崎 恭史,大本 正人,(関西電力)
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We have researched radiation-induced deterioration behaviors of cable insulation materials used in nuclear power plants and a nondestructive inspection method to detect the behaviors in our past reports. The deterioration was generated by electron beam irradiation simulating gamma-ray irradiation in the field. As a result, we found it possible to detect the deterioration by comparing the natural frequencies of the cables before and after the irradiation through our original digital hammering inspection tech...
英字タイトル:
Development of nondestructive inspection system for soundness diagnosis of cable insulating material (3)
第16回
コンフィグレーション管理(CM)および設計基準文書(DBD)について
著者:
土肥 伸樹,吉川 博喜,富永 悠揮,(関西電力)
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Configuration Management (CM) guarantees that plant activities can be performed safely and appropriately, by maintaining the balance of the three elements (design requirements, facility configuration information, and physical configuration) that are the basis for securing the safety of the plant. If this becomes unbalanced, the risk of occurrence of events affecting nuclear safety will increase. Kansai Electric Power is developing a Design Basis Document (DBD) that summarizes design requirements in order to...
英字タイトル:
Configuration Management and Design Basis Document
第15回
バレルフォーマボルト、炉心そう等のIASCC保全に関する取り組み
著者:
最上 雄一,和地 永嗣,(三菱重工),池田 惇 ,(関西電力),関 弘明,(JANSI)
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Core barrel is a cylindrical support structure in reactor internals in PWR (Pressurized Water Reactor) plants and a baffle-former assembly and fuel assemblies are placed in it. Barrel former bolts fasten a baffle-former assembly to Core barrel. Core barrel and Barrel former bolts are exposed to relatively high neutron irradiation due to their proximity to fuel assemblies. In order to properly manage the structural integrity of these parts against the degradation caused by neutron irradiation, inspection and...
英字タイトル:
IASCC maintenance activities on Barrel Former Bolts and Core Barrel
第16回
原子力発電所の保守管理規程/指針(JEAC4209/JEAG4210)改定の検討状況
著者:
鈴木 直浩,(中部電力),笠毛 誉士,(九州電力),真壁 知宏,(東京電力HD),中廣 雄一,(関西電力),堀水 靖,(JANSI)
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Principles of Nuclear Power Station's maintenance was established as Code for Maintenance at Nuclear Power Plants (JEAC 4209) in 2003 and revised in 2007,2014 And also Guide for Maintenance at Nuclear Power Plants was established in 2007 and revised in 2014. Recently these Code & Guide were revised accordingly and published as JEAC4209-2016 and as JEAG 4210-2016. Revising these Code & Guide are now under review. Points of the revision is to implement the new regulatory inspection system enforced in 2020 ref...
英字タイトル:
Progress report of Revising Code and Guide for Maintenance at Nuclear Power Plants
第15回
原子力発電所の長期運転(高経年化対策)への取り組みについて
著者:
南 安彦,(関西電力)
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The integrity of many SSEs of nuclear power plant has been maintained by various and continuous maintenance activities (replacement of components, preventive countermeasures for aging issues, etc.) so far. And the utilities have been implemented technical ageing evaluation for SSEs and established the long term maintenance policy for aging management. In this paper, the activities for long term operation and extension of operation period beyond 40 years that have been implemented by the utilities are descri...
英字タイトル:
The Activities for Long Term Operation of Nuclear Power Plants