{"id":1618,"date":"2016-09-14T18:36:06","date_gmt":"2016-09-14T09:36:06","guid":{"rendered":"https:\/\/fdada.info\/?page_id=1618"},"modified":"2017-04-03T11:02:04","modified_gmt":"2017-04-03T02:02:04","slug":"decommissioning-12-en","status":"publish","type":"page","link":"https:\/\/fdada.info\/fdada\/en\/home2\/decommissioning2\/progress2\/decommissioning-12-en\/","title":{"rendered":"<!--e02-01-07-->Unit 1"},"content":{"rendered":"<!-- category=progress lang=en -->\r\n\r\n\r\n<div class=\"subnavi\">\r\n<ul>\r\n<li><a href=\"..\/decommissioning-15-en\">Summary of Decommissioning and Contaminated Water Management<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-11-en\">Progress Status and Future Challenges of the Mid-and-Long-Term Roadmap<br \/>toward Decommissioning of TEPCO\u2019s Fukushima Daiichi Nuclear Power Station Units 1-4 (Outline)<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-16-en\">Progress report<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-8-en\">Status of seawater monitoring within and outside of the port<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-4-en\">Progress toward decommissioning:Fuel removal from the spent fuel pool (SFP)<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-5-en\">Progress toward decommissioning:Works to identify the plant status and toward fuel debris removal<\/a>\r\n<ul class=\"triangle\">\r\n<li class=\"sub active\"><a href=\"..\/decommissioning-12-en\">Unit 1<\/a><\/li>\r\n<li class=\"sub\"><a href=\"..\/decommissioning-13-en\">Unit 2<\/a><\/li>\r\n<li class=\"sub\"><a href=\"..\/decommissioning-14-en\">Unit 3<\/a><\/li>\r\n<\/ul>\r\n<\/li>\r\n<li><a href=\"..\/decommissioning-2-en\">Progress toward decommissioning:Work related to circulation cooling and accumulated water treatment line<\/a><\/li>\r\n<li><a href=\"..\/decommissioning-10-en\">Progress toward decommissioning:Work to improve the environment within the site<\/a><\/li>\r\n<\/ul>\r\n<\/div>\r\n<div id=\"article\" class=\"short_l\">\r\n<h1>Unit 1<\/h1>\r\n<h2>Status of Progress Points<\/h2>\r\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_01.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<span style=\"font-size: 10px;\">&emsp;(*2) SFP (Spent Fuel Pool)<\/span><br \/>\r\n<span style=\"font-size: 10px;\">&emsp;(*5) RPV (Reactor Pressure Vessel)<\/span><br \/>\r\n<span style=\"font-size: 10px;\">&emsp;(*6) PCV (Primary Containment Vessel)<\/span><br \/>\r\n<br \/>\r\n<br \/>\r\n<h3 class=\"ptitle\">Investigation into TIP Room of the Unit 1 Reactor Building<\/h3>\r\n<ul class=\"list\">\r\n<li>To improve the environment for future investigations inside the PCV, etc., an ivestigation was conducted from September 24 to October 2, 2015 at the TIP<sup>(*1)<\/sup> Room. (Due to high dose around the entrance in to the TIP Room, the investigation of dose rate and contamination distribution was conducted through a hole drilled from the walkway of the Turbine Building, where the dose was low).<\/li>\r\n<li>The investigative results identified high dose at X-31 to 33 penetrations<sup>(*2)<\/sup> (instrumentation penetration) and low dose at other parts.<\/li>\r\n<li>As it was confirmed that work inside the TIP room would be available, the next step will include identification of obstacles which will interfere the work inside the TIP Room and formulation of a plan for dose reduction.<\/li>\r\n<span style=\"font-size: 10px;\">&emsp;(*1) TIP (Traversing In-core Probe)<\/span><br \/>\r\n<span style=\"font-size: 10px;\">&emsp;(*2) Penetration: Through-hole of the PCV<\/span><br \/>\r\n<\/ul>\r\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_05.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<br \/>\r\n<h3 class=\"ptitle\">3D laser scan inside the Unit 1 R\/B underground floor<\/h3>\r\n<ul class=\"list\">\r\n<li>The upper part of the underground floor (torus room) of Unit 1 R\/B was investigated with a laser scan using a remote-controlled robot, and collected 3D data.<\/li>\r\n<li>3D data, which allows examination based on actual measurements, can be used to examine more detailed accessibility and allocation of equipment.<\/li>\r\n<li>Combining it with 3D data on the R\/B 1st floor allows obstacles on both 1st and underground floors to be checked simultaneously. This allows efficient examination of positions to install repair equipment for PCVs and vacuum break lines.<\/li>\r\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_02.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<\/ul>\r\n<br \/>\r\n<h3 class=\"ptitle\">Investigation in the leak point detected in the upper part of Unit 1 Suppression Chamber (S\/C<sup>(*3)<\/sup>)<\/h3>\r\n<p style=\"font-size: 10px;\">&emsp;(*3) S\/C (Suppression Chamber): Suppression pool, used as the water source for the emergent core cooling system.<\/p>\r\n<ul class=\"list\">\r\n<li>Investigation in the leak point detected in the upper part of Unit 1 S\/C from May 27, 2014 from one expansion joint cover among the lines installed there. As no leakage was identified from other parts, specific methods will be examined to halt the flow of water and repair the PCV.<\/li>\r\n<\/ul>\r\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_04.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<br \/>\r\n<h3 class=\"ptitle\">Status of investigation inside the PCV<\/h3>\r\n<p>Prior to fuel debris removal, an investigation inside the PCV will be conducted to inspect the status there including the location of fuel debris.<\/p>\r\n<p>[Investigative outline]<\/p>\r\n<ul class=\"list\">\r\n<li>In April 2015, an device, which entered the inside of the PCV through a narrow access opening (bore: \u03c6100 mm), collected information such as images and airborne dose inside the PCV 1st floor.<\/li>\r\n<li>Based on the knowledge obtained from the above investigation in April 2015, another investigation will be conducted in March 2017, in which a dosimeter and a camera mounted on a self-propelled investigation device will be suspended from the 1st floor grating to inspect the status on the basement floor outside the pedestal and around the workers access opening.<\/li>\r\n<\/ul>\r\n<p style=\"text-align: center;font-size: 16px;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_03.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"\/images\/decommissioning\/unit1_01_er.png\" border=\"0\" alt=\"\" \/><\/p>\r\n<\/ul>\r\n<br \/>\r\n<\/div>\r\n<!-- end.div article -->\r\n\r\n","protected":false},"excerpt":{"rendered":"Summary of Decommissioning and Contaminated Water Management Progress Status and Future Challenges of the Mid- [&hellip;]","protected":false},"author":1,"featured_media":0,"parent":1537,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"class_list":["post-1618","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/pages\/1618","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/comments?post=1618"}],"version-history":[{"count":4,"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/pages\/1618\/revisions"}],"predecessor-version":[{"id":3518,"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/pages\/1618\/revisions\/3518"}],"up":[{"embeddable":true,"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/pages\/1537"}],"wp:attachment":[{"href":"https:\/\/fdada.info\/fdada\/wp-json\/wp\/v2\/media?parent=1618"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}