Proceedings of the ... International Conference on Nuclear Engineering. Book of abstracts : ICONE
Online ISSN : 2424-2934
2023.30
セッションID: 1584
会議情報

AGEING MANAGEMENT OF OHMA NUCLEAR POWER PLANT DURING DELAYED CONSTRUCTION
Toshiyuki FurukawaKazushi HayakawaTakashi Umeoka
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Construction work of Ohma NPP was suspended due to the Great East Japan Earthquake in March 2011 when progress rate of construction was 37.6%. At that time, due to the suspension of construction, some equipment was left unproper environment.

Though construction work was resumed in October 2012, construction areas were limited within the scope that would not be affected by the new regulatory requirements.

At present, we have no choice but to store the equipment for a long period of time at the construction site and the vendor’s factories. Under these circumstances, we’ve been addressing ageing management such as monitoring and trending of ageing effects and taking preventive actions to minimize and control ageing effects in cooperation with the venders. And appropriateness of the countermeasures was confirmed by unpacking curing and overhaul representative equipment.

The soundness of the equipment in storage will be finally confirmed through various tests along with construction progress in the future.

At Ohma NPP, it is assumed that current situation on product maintenance will continue for the time being. In Japan, there is no precedent for product storage during construction for such a long period of time, and we will continue to consider, implement, manage, and improve the measures, with the cooperation of the venders.

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© 2023 The Japan Society of Mechanical Engineers
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