Among the fire protection measures in nuclear power plants, the fireproof performance of the fireproof partition installed for system separation is required to satisfy the fire endurance test based on the Building Standard Law. In this time, we report on the result of examining the specification of the fireproof material and the attachment method to the cable tray etc. For the fireproof partition (1 hour fireproof) installed in the cable tray that satisfies the above requirements....
英字タイトル:
Examination of 1 hour fireproof specification of cable tray

Cable pit under the floor of the main control room of the nuclear power plant is structured as a small section so as to physically separate cables with different safety classifications. This time, a part of cable pit under the floor, which is a narrow and complicated structure, was mocked up and a test was conducted assuming the occurrence of fire at various places in the cable pit. Experiments confirmed the fluidity of smoke and fire extinguishing performance (diffusion and retention state of extinguishing...
英字タイトル:
Consideration of fire extinguishing system inside cable pit under main control room

Abstract The wall thinning management program at Hamaoka Nuclear Power Station stipulate object points and test frequencies dependi ng on wall thinning environment (flow condition, material). Currently, object points and test frequency are determined conservative ly, which contribute to an increase of radiation exposure of filed workers. Development of measurement technology and improvement of prediction technology for a progress of wall thinning may enable utilities to conduct a more effective wall thinn...
英字タイトル:
Expectations of Wall Thinning Management For Development of Measurement Technology and Improvement of Prediction Technology for Progress of Wall Thinning

The new regulatory requirements for inspections at nuclear power station took effect in January 2009,which requi re utilities to enhance an optimization of maintenance programs. At the same time, this regulatory change made it possible for utilities to apply for an extension of the operating cycle of a plant from 13 months of previous regu latory limit up to 24 months.In this paper, approaches to extend operating cycle of Hamaoka Unit 3 are described....
英字タイトル:
Approaches to extend operating cycle of Hamaoka Unit 3

Nuclear power plants are required not to lose safety functions against assumed natural phenomena as damage prevention from external impact. Among possible natural phenomena, it is known that blockage of the intake filter by volcanic ash occurs due to the volcanic effect. Therefore, we are investigating a volcanic ash removal system that uses a metal filter that can remove volcanic ash before the intake filter and supply clean air....
英字タイトル:
Examination of volcanic ash removal system using metal filter