原子力発電所では工事施工に係わる申請書類が数多く存在する。それらの書類が社内ネットワーク上に点在 していたため、目的の書類に辿り着く迄に時間が掛かっていた。本稿では、この問題を解決するために「志 賀事業所応援システム（Shika-Ouen-System）」の構築を行い、問題の改善を図った事例を紹介する。...

Significant numbers of intergranular stress corrosion cracking incidents have occurred in welded austenitic stainless steel of primary loop recirculati on system piping in boiling water reactors. This crack was also occurred in Shika Nuclear Power unit 1. This time, stress improvement processing by hig frequency guidance overheating has been performed as preventive maintenance to the weld line with which we are anxious about generating of stress corr ion cracking among the weld lines of primary loop recirc...
英字タイトル:
Induction Heating Stress Improvement for pipe of primary loop recirculation system at Shika Nuclear Power Station Unit 1

The Fukushima Daiichi nuclear disaster was initiated by the Tohoku earthquake and subsequent massive tsunami on 11 March 2011. To prevent the event as the Fukushima Daiichi nuclear disaster, we had implemented the necessary safety reinforcement measures in Shika Nuclear Power Stations. In this paper, we are going to introduce the flood prevention measures that prevent seawater from entering the power stations. And we also secured emergency power supplies for the case of loss of all AC power supplies. I...
英字タイトル:
The Safety Reinforcement Measures at Shika Nuclear Power Station

最所 丈博 Takehiro SAISHO This paper describes field experience of seismic-upgrading modification which enhances seismic design margin for Shika nuc lear power plants units 1 and 2. Modification for piping support, cable tray support and conduit support for electric cabl e, was performed during plant outage due to considering plant safety. On the other hands, we carried out patrols in order to prevent a fire and worker's accident during construction period, and were able to complete the work without an acc...
英字タイトル:
Seismic-Upgrading Modification for Shika Nuclear Power Plants Unit 1 and 2

The lube oil leakage from indicator valves of Emergency Diesel Generator was found at Shika nuclear po wer plant Unit 2 in Dec. 2009. As a result of investigation, we found that temperature fall after shut down of diesel engine generate negative pressure in the combustion chamber, and the cooling oil for pi ston leak into the combustion chamber through the oil-drain port of piston by this negative pressure....
英字タイトル:
The lube oil leakage from indicator valves of Emergency Diesel Generator