Grease lubricated bearings needs adding grease periodically for keeping good condition. Sometimes bearings have abnormal temperature with over lubrication. We can avoid the situation with herring rotation sound of bearings on the greasing. That sound turn normal sound when bearings have appropriate lubrication. At the time we stop adding grease. As a result, we can avoid over lubrication. However, feeling of the sound are different with each person. Therefore we used visualization of sounds technology for t...
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Activity of avoiding over lubrication for grease lubricated bearings

In the process of achieving cold shutdown following the shutdown of Hamaoka Nuclear Power Station Unit 5 on May 14, 2011, the readings of conductivity meters monitoring the purity of the water in the main condensers began to rise, and the conductivity of the water in the reactor also began to rise. After cold shutdown, investigation identified that a high volume of sea water had flowed into the reactor facility due to damage to the main condenser tubes. Evaluations focusing on corrosion of materials have b...
英字タイトル:
Effect of sea water intrusion from main condenser, damaged by breakon reactor core internals, Hamaoka Unit 5

弊社が中部電力㈱の浜岡原子力発電所１,２号機の廃止措置に着手し、５年の月日が経ち設備の解体が進み、 解体撤去物のクリアランス制度を活用した建屋外への搬出も始まりました。浜岡の廃止措置の現状と原子炉 領域の解体に向けた課題などをご紹介します。...

Decommissioning began at the Hamaoka Nuclear Power Station, and three years have passed. We will introduce the surveys and results we conducted before the start of decommissioning. In March 2019, the clearance system for dismantled items has also been approved, and the disposal of dismantling waste is also beginning. We will introduce the current status of the decommissioning of Hamaoka Nuclear Power Station Unit 1 and 2 and various issues that have been seen in the process of dismantling construction....
英字タイトル:
Hamaoka Nuclear Power Station Unit 1 and 2 How to proceed with decommissioning

In the process of achieving cold shutdown following the shutdown of Hamaoka Nuclear Power Station Unit 5 on May 14, 2011, large quantities of seawater flowed into the reactor and other facilities due to main condenser tubes which had broken. The investigations focusing on corrosion of materials had been conducted through various methods, observation of equipments, material tests, cleaning tests, and inspection of RPV and its components. Based on these investigations, we had evaluated the impact on the...
英字タイトル:
Effect of sea water intrusion from main condenser, damaged by break on reactor core internals, Hamaoka Unit 5(No.2)

電動弁診断において弁の動作状況を表すグラフの波形を観察すると点検における着目点、劣化を監視する 必要のある個所などの情報を得ることができる。浜岡原子力発電所で経験した事例を紹介する。...