In response to the Tokyo Electric Power Company's Fukushima Daiichi Nuclear Power Plant accident caused by the 2011 Great East Japan Earthquake and Tsunami, it is desirable to formulate technical guidelines for nuclear power plant flood prevention equipment, and JEA (The Japan Electric Association) formulated "Technical Guidelines for Watertight Facilities (JEAG4630-2016)".&nbsp;The Guidelines, presented at ICONE26, describe the basic matter about the design of watertight doors, penetration seals of building walls or slabs for distribution systems such as pipes, conduits, ducts, and also explain the important items of manufacture, construction, and inspection for the flood protection facilities.Since formulating "Technical Guidelines for Watertight Facilities (JEAG4630-2016), the working group in JEA have been considering enhancement of this guidance, while conducting questionnaires to confirm the needs of utilities regarding the equipment to be added to the scope of this guidance. According to the surveys, working group members have taken action to improve this guidance to investigate additional facilities which are a watertight hatch, a removable watertight plate, a self-shutting flap gate, flood protection dampers, and drain check valves. Furthermore, since this guidance is also useful for internal flooding countermeasures, the working group also handled a door with a water-pass gate and a stretchable frangible steel joint (closer joint) which are applied for a countermeasure against breakage of expansion joint for a circulating water pipe. These facilities were introduced at ICONE27.The enhanced guidelines draft was summarized after numerous discussions with relevant experts at the working group. Nuclear Standards Committee of JEA and its subcommittee has deliberated the guidelines draft and presented valuable opinions, so the working group has made corresponding corrections. These opinions are to be clearer about the key essences common to the design of flood protection equipment, to attach the case studies of some equipment, and to be consider the maintenance and management system guides for nuclear power facilities.Authors will introduce the status and outline of the advanced guidelines.

Enhancement Status of "Technical Guidelines for Watertight Facilities (Jeag4630)"

Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE28/volume/85246

2021 28th International Conference on Nuclear Engineering (ICONE28)

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