Tokai Reprocessing Plant (TRP) is implementing its decommissioning activities based on the decommissioning plan approved by Nuclear Regulation Authority (NRA). In the decommissioning, safety countermeasure against earthquakes and tsunamis is a top priority matter, especially for High Active liquid Waste facility (HAW) and Tokai Vitrification Facility (TVF), which handle highly radioactive liquid waste with high safety risks. This study focuses on the immediate tsunami countermeasures among the other safety ...
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Evaluation of Tsunami debris impact on Tokai Reprocessing Plant

A leakage was found on the sea release pipe of the Tokai reprocessing plant The leak point was discovered in a part buried in the sea floor The damaged part was cut and was collected, and investigation into the cause was subsequently carried out As a result, external force and hydrogen embrittlement were estimated to be the cause that produced a crack on the pipe As restoration of the leak part, a construction method using a coupling technique was proposed considering steady sealability on the restore...
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Liquid leakage from the sea release pipe of the Tokai reprocessing plant- Restoration of the leak point at the see release pipe --

Cracks were found at shroud support of Tokai II Power Station in 24th outage. Flaw evaluation of these cracks was performed applying Co des for Nuclear Power Generation Facilities - Rules on Fitness-for-Service ? (FFS Code) of Japan Society of Mechanical Engineers (JSME) and Guideline for Inspection and Evaluation of Reactor Internals of Japan Nuclear Technology Institute (JANTI). Evaluation methods and r esults are outlined in this report. Issues to be studied for better improvement of JSME FFS Code and J...
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Application of JSME Fitness-for-Service Code and JANTI Guideline for Inspection and Evaluation of ReactorInternals to Cracks found at Shroud Support of Tokai II Power Station

There are various conditions (radiation controlled area, special equipment, special rule and so on) in nuclear related facilities. When we work there, we are always required to achieve high level of safety, reliability and efficiency. We self-manufacture tools to eliminate unreasonableness (Muri), unprofit (Muda), unevenness (Mura) and also improve efficiency. Always aiming the improvement of safety and productivity is one of the important missions as a cooperating company. In this report, we introduce seve...
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Kaizen effort of maintenance in nuclear related facility by tool production

Nuclear spent fuel intermediate storage facility is planned to be located in the Sea of Japan coast area. Therefore, there is risk of structure corrosion by sea salt aerosol. This study is the co rrosion risk evaluation and it's countermeasure of that facility....
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Evaluation of Salt Damage Structure Located in the Coastal

In domestic plants, sea water is used for cooling the auxiliary coolers, the lining of sea water pipe inside as anticorrosion materials is used with rubbers, polyethylene, epoxy resins, and etc. And the lining conditions are mainly confirmed by direct visual inspection. In the sea water pip g, the once occurred the small through-holes(pin-hole) accelerate the piping degradation caused by corrosion and it is important to confirm the deterioration condition of lining at an early st age. However, to confirm ...
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The Advancement of lining inspection technology inside sea water piping

Laser peening is a surface enhancement process that introduces compressive residual stress on materials by irradiating laser pulses under aqueous environment. The process utilizes the impulsive effect of high-pressure plasma generated by ablative interaction of each laser pulse. It is very beneficial to shorten ou tage period if laser peening is available during refueling work. It is confirmed that laser peening can be available in the situation by experiment and analys is. This report describes detail of ...
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Study on availability of laser peening during refueling work- Preventive maintenance to shorten outage period

Abstract In operation of nuclear power plants (NPPs), it is required not only to preserve and improve the reliability and safety, but also to introduce more efficient and lower cost maintenance strategy simultaneously, due to the power trading deregulation in recent years. For this purpose, Condition Based maintenance (CBM), which has been extensively applied i n the nuclear power plant of U.S., is introduced as a maintenance method for rotating machines in Japanese nuclear power plant. TOSHIBA develops t...
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Development and application of Monitoring and Diagnosis Techniques for Condition Based Maintenance in Nuclear Power Plant

Abstract In operating of nuclear power plants, it is required not only to preserve and improve the reliability and safety, but also to introduce more efficient and lower cost maintenance strategy simultaneously, due to t he power trading deregulation in recent years. In addition, as the number of experienced operators / maintenance personnel decreases, comprehensive implementation of objective and transparent information provision syste m on plant operation and maintenance (O&M) being compliant with the la...
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Development of Remote Operation & Maintenance Support service system