{"id":527,"date":"2004-09-04T17:16:32","date_gmt":"2004-09-04T08:16:32","guid":{"rendered":"http:\/\/www.cnic.jp\/english\/wordpress\/?p=527"},"modified":"2015-02-27T18:04:23","modified_gmt":"2015-02-27T09:04:23","slug":"significant-incidents-at-japanese-nuclear-power-plants-and-nuclear-fuel-facilities-jan-2003-dec-2003","status":"publish","type":"post","link":"https:\/\/cnic.jp\/english\/?p=527","title":{"rendered":"Significant incidents at Japanese nuclear power plants and nuclear fuel facilities (Jan. 2003 – Dec. 2003)"},"content":{"rendered":"\n\n\n
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DATE<\/i><\/b><\/td>\nOperator<\/i><\/b><\/td>\nFacility Name<\/i><\/b><\/td>\nType<\/i><\/b><\/td>\nShort Description of Incidents<\/i><\/b><\/td>\n<\/tr>\n
Feb. 7<\/td>\nJNFL (Japan Nuclear Fuel Limited)<\/td>\nRokkasho Reprocessing Plant<\/td>\nReprocessing Plant<\/td>\nLeak detected at fuel assembly transfer pit<\/td>\n<\/tr>\n
Feb. 12<\/td>\nKansai-EPCO<\/td>\nTakahama-1<\/td>\nPressurized Water Reactor (PWR)<\/td>\nDuring periodic inpection crack found at neutron flux monitor nozzle (made of Inconel 600) mounted to reactor vessel bottom<\/td>\n<\/tr>\n
Feb. 18<\/td>\nShikoku-EPCO<\/td>\nIkata-1<\/td>\nPWR<\/td>\nLeak detected at chemical volume control tank outlet piping<\/td>\n<\/tr>\n
Feb. 27<\/td>\nJAPC (Japan Atomic Power Company)<\/td>\nTsuruga-1<\/td>\nBoiling Water Reactor (BWR)<\/td>\nReactor manually shut down due to leak detected at mechanical seals of\u00a0recirculation pumps (B and C)<\/td>\n<\/tr>\n
Feb. 27<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-3<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L) during planned stoppage<\/td>\n<\/tr>\n
Feb. 28<\/td>\nTokyo-EPCO<\/td>\nFukushima I-3<\/td>\nBWR<\/td>\nControl rod interlock cancelation found at ‘one control rod draw check’ during periodic inspection<\/td>\n<\/tr>\n
March 4<\/b><\/td>\nTokyo-EPCO<\/b><\/td>\nFukushima I-3<\/b><\/td>\nBWR<\/b><\/td>\nA control rod insertion delayed at ‘control rod insertion\/draw examination’ during periodic inspection<\/b><\/td>\n<\/tr>\n
March 5<\/b><\/td>\nTokyo-EPCO<\/b><\/td>\nFukushima II-1<\/b><\/td>\nBWR<\/b><\/td>\nForeign metal material found at the top of a nuclear fuel assembly during periodic inspection<\/b><\/td>\n<\/tr>\n
March 10<\/td>\nChubu-EPCO<\/td>\nHamaoka-3<\/td>\nBWR<\/td>\nCracks found at welds of core shroud (made of SUS316L) middle and lower region during periodic inspection; cracks found at inside surface of H4 position, at outside surface of H6a position, at inside surface of H7 position, etc.<\/td>\n<\/tr>\n
March 27<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-4<\/td>\nBWR<\/td>\nCracks found at 6 welds of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
April 16<\/td>\nTokyo-EPCO<\/td>\nFukushima II-1<\/td>\nBWR<\/td>\nCracks found at a weld between reactor pressure vessel nozzle safe-end pipe (made of SUS316L) and primary loop recirculation system piping (made of SUS304L) during periodic inspection<\/td>\n<\/tr>\n
April 17<\/td>\nChubu-EPCO<\/td>\nHamaoka-3<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
April 17<\/td>\nChubu-EPCO<\/td>\nHamaoka-4<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
April 29<\/td>\nChugoku-EPCO<\/td>\nShimane-2<\/td>\nBWR<\/td>\nCracks found at welds of core shroud (made of SUS316L) middle region during periodic inspection; cracks found at inside surface of H4 position<\/td>\n<\/tr>\n
May 8<\/td>\nKansai-EPCO<\/td>\nMihama-2<\/td>\nPWR<\/td>\nGenerator power reduced due to leak at 5th high pressure feed water heater<\/td>\n<\/tr>\n
May 12<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-5<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
May 15<\/b><\/td>\nKyushu-EPCO<\/b><\/td>\nSendai-1<\/b><\/td>\nPWR<\/b><\/td>\nDamage to 15 steam generator tubes during periodic inspection<\/b><\/td>\n<\/tr>\n
May 20<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-5<\/td>\nBWR<\/td>\nCracks found at welds of core shroud (made of SUS316L) middle region during periodic inspection; cracks found at inside surface of H4 position and of V14 position<\/td>\n<\/tr>\n
May 21<\/td>\nKansai-EPCO<\/td>\nMihama-3<\/td>\nPWR<\/td>\nCracks found at reactor vessel bottom mounted conduit tube during periodic inspection<\/td>\n<\/tr>\n
May 22<\/b><\/td>\nKansai-EPCO<\/b><\/td>\nTakahama-4<\/b><\/td>\nPWR<\/b><\/td>\nDamage to 2 steam generator tubes during periodic inspection<\/b><\/td>\n<\/tr>\n
May 26<\/td>\nTohoku-EPCO<\/td>\nOnagawa-3<\/td>\nBWR<\/td>\nReactor automatically shutdown due to ‘large ground acceleration’ signal set off by an earthquake (magnitude 7.0)<\/td>\n<\/tr>\n
May 28<\/td>\nTokyo-EPCO<\/td>\nFukushima II-3<\/td>\nBWR<\/td>\nCracks found at guide roller installed area of a control rod handle during periodic inspection<\/td>\n<\/tr>\n
June 9<\/td>\nTohoku-EPCO<\/td>\nOnagawa-2<\/td>\nBWR<\/td>\nCracks found at welds of core shroud (made of SUS316L) middle region and lower region during periodic inspection; cracks found at outside surface of H3 position and at inside surface of H7a position<\/td>\n<\/tr>\n
June 10<\/td>\nChubu-EPCO<\/td>\nHamaoka-1<\/td>\nBWR<\/td>\nCracks found at a weld of core shroud (made of SUS304) lower region during periodic inspection; cracks found at inside surface of H7b position<\/td>\n<\/tr>\n
June 14<\/td>\nTokyo-EPCO<\/td>\nFukushima II-3<\/td>\nBWR<\/td>\nFuel assemblies installation operation stopped due to lack of a control rod at a fuel cell during periodic inspection<\/td>\n<\/tr>\n
June 16<\/td>\nChubu-EPCO<\/td>\nHamaoka-1<\/td>\nBWR<\/td>\nCracks found at upper region of a weld of the core shroud (made of SUS304) during periodic inspection; crack found near upper lattice plate base<\/td>\n<\/tr>\n
June 23<\/td>\nTohoku-EPCO<\/td>\nOnagawa-2<\/td>\nBWR<\/td>\nCracks found at a weld of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
June 24<\/td>\nJAPC<\/td>\nTsuruga-1<\/td>\nBWR<\/td>\nCracks found at surface of control rod blades during periodic inspection<\/td>\n<\/tr>\n
July 4<\/td>\nJNC (Japan Nuclear Cycle Development Institute)<\/td>\nFugen<\/td>\nAdvanced Thermal Reactor<\/td>\nFire alarm set off at waste treatment building; window of low-level radioactive waste incinerator broken due to explosion and 460 million bequerels of radioactive ash leaked<\/td>\n<\/tr>\n
July 8<\/b><\/td>\nJNC<\/b><\/td>\nJoyo<\/b><\/td>\nExperimental Fast Reactor<\/b><\/td>\nReactor automatically shut down due to ‘neutron flux high’ signal<\/b><\/td>\n<\/tr>\n
July 15<\/td>\nTokyo-EPCO<\/td>\nFukushima II-2<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
July 24<\/td>\nTokyo-EPCO<\/td>\nFukushima I-2<\/td>\nBWR<\/td>\nLeak found at instrumentation outlet of residue heat removal system during periodic inspection<\/td>\n<\/tr>\n
July 29<\/td>\nHokuriku-EPCO<\/td>\nShika-1<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L)during periodic inspection (also on Aug. 26 and on Sep. 3)<\/td>\n<\/tr>\n
July 31<\/td>\nTokyo-EPCO<\/td>\nFukushima II-2<\/td>\nBWR<\/td>\nCracks found at welds of core shroud (made of SUS316L) middle region during periodic inspaction; cracks found at outside surface of H4 position<\/td>\n<\/tr>\n
Aug. 1<\/td>\nTohoku-EPCO<\/td>\nOnagawa-2<\/td>\nBWR<\/td>\nCracks found at welds of primary loop recirculation system piping (made of SUS316L)during periodic inspection<\/td>\n<\/tr>\n
Sep. 7<\/b><\/td>\nHokkaido-EPCO<\/b><\/td>\nTomari-2<\/b><\/td>\nPWR<\/b><\/td>\nLeak found at regenerated heat exchanger; reactor manually shut down for inspection on Sep. 11<\/b><\/td>\n<\/tr>\n
Sep. 10<\/b><\/td>\nJAPC<\/b><\/td>\nTsuruga-2<\/b><\/td>\nPWR<\/b><\/td>\nBuild up of boric acid powder and cracks found at welds of pressurizer relief valve nozzle and of pressurizer safety valve nozzle during periodic inspection<\/b><\/td>\n<\/tr>\n
Oct. 6<\/td>\nTohoku-EPCO<\/td>\nOnagawa-2<\/td>\nBWR<\/td>\nLeak detected at containment vessel sump; damage found at mechanical seals of recirculation inlet pump and of recirculation outlet pump during periodic inspection<\/td>\n<\/tr>\n
Oct. 6<\/td>\nTokyo-EPCO<\/td>\nFukushima II-4<\/td>\nBWR<\/td>\nCracks found at guide roller installed area of control rod handles and at surface of control rod blades during periodic inspection<\/td>\n<\/tr>\n
Oct. 7<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-7<\/td>\nBWR<\/td>\nCracks found at impellers of reactor internal pumps during periodic inspection<\/td>\n<\/tr>\n
Oct. 9 – Nov. 7<\/td>\nTokyo-EPCO<\/td>\nFukushima I-1,2,3,4,6<\/td>\nBWR<\/td>\nVarious foreign materials (scaffolding members, clamps, vinyl sheet chips, vinyl tape chips, ropes, spanner, pen, etc.) found in suppression chambers during periodic inspection<\/td>\n<\/tr>\n
Oct. 14<\/td>\nChugoku-EPCO<\/td>\nShimane-1<\/td>\nBWR<\/td>\nSpacers slippage found at fuel assemblies during periodic inspection<\/td>\n<\/tr>\n
Oct. 14 – Nov. 7<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-1,2,3,5,7<\/td>\nBWR<\/td>\nVarious foreign materials (vinyl sheet chips, ropes, electromoved grinder, pliers, dust mask, video tape, boot, heat insulating materials, etc.) found in suppression chambers during periodic inspection<\/td>\n<\/tr>\n
Oct. 16 – Nov. 7<\/td>\nTokyo-EPCO<\/td>\nFukushima II-1,2,3,4<\/td>\nBWR<\/td>\nVarious foreign materials (vinyl sheet chips, vinyl tape chips, ropes, spanner, pen, etc.) found in suppression chambers during periodic inspection<\/td>\n<\/tr>\n
Oct. 17<\/td>\nShikoku-EPCO<\/td>\nIkata-3<\/td>\nPWR<\/td>\nEmergency diesel generator activation failed at start-up operation<\/td>\n<\/tr>\n
Oct. 22<\/td>\nKansai-EPCO<\/td>\nTakahama-2<\/td>\nPWR<\/td>\nReactor manually shut down due to steam leak from 3rd low-pressure turbine inlet flange during conditioning operation<\/td>\n<\/tr>\n
Oct. 22<\/td>\nTokyo-EPCO<\/td>\nFukushima II-4<\/td>\nBWR<\/td>\nCrack found at weld of primary loop recirculation system piping (made of SUS316L) during periodic inspection<\/td>\n<\/tr>\n
Nov. 5<\/td>\nTokyo-EPCO<\/td>\nKashiwazaki-Kariwa-2<\/td>\nBWR<\/td>\nOne part of cleaning device fell into reactor vessel during core shroud cleaning test operation during periodic inspection<\/td>\n<\/tr>\n
Nov. 6<\/td>\nTohoku-EPCO<\/td>\nOnagawa-2<\/td>\nBWR<\/td>\nVarious foreign materials (wire, vinyl sheet chips, vinyl tape chips, ropes, miniature lamp, etc.) found in suppression chambers during periodic inspection<\/td>\n<\/tr>\n
Nov. 9<\/b><\/td>\nKansai-EPCO<\/b><\/td>\nMihama-2<\/b><\/td>\nPWR<\/b><\/td>\nReactor manually shut down due to primary coolant leak found at cap of bent line attached to pressurizer spray piping<\/b><\/td>\n<\/tr>\n
Nov. 18<\/td>\nTokyo-EPCO<\/td>\nFukushima I-6<\/td>\nBWR<\/td>\nOne part of cleaning device fell into reactor vessel during control rod drive mechanism housing tub tube cleaning operation during periodic inspection<\/td>\n<\/tr>\n
Nov. 19<\/td>\nChubu-EPCO<\/td>\nHamaoka-2<\/td>\nBWR<\/td>\nSCRAM signal set off accidentally due to ocsillation in value indicated by average power range monitor<\/td>\n<\/tr>\n
Nov. 22<\/td>\nChubu-EPCO<\/td>\nHamaoka-1<\/td>\nBWR<\/td>\nOne part of cleaning device fell into reactor vessel during core shroud support cylinder cleaning operation during periodic inspection<\/td>\n<\/tr>\n
Nov. 25<\/td>\nChubu-EPCO<\/td>\nHamaoka-1<\/td>\nBWR<\/td>\nCracks found at welds of core shroud support cylinder and of core shroud support legs during periodic inspection<\/td>\n<\/tr>\n
Dec. 2<\/td>\nChugoku-EPCO<\/td>\nShimane-1<\/td>\nBWR<\/td>\nA worker exposed due to inhalation of 917 bequerels of cobalt-60 during containment vessel head installation operation<\/td>\n<\/tr>\n
Dec. 5<\/td>\nKansai-EPCO<\/td>\nOhi-1<\/td>\nPWR<\/td>\nReactor manually shut down due to leak from mechanical seal of primary coolant pump<\/td>\n<\/tr>\n
Dec. 5<\/b><\/td>\nTokyo-EPCO<\/b><\/td>\nFukushima I-6<\/b><\/td>\nBWR<\/b><\/td>\nLeak found at water level gauge tube opening during periodic inspection<\/b><\/td>\n<\/tr>\n
Dec. 18<\/td>\nChubu-EPCO<\/td>\nHamaoka-1<\/td>\nBWR<\/td>\nCracks found at welds of jet pumps during periodic inspection<\/td>\n<\/tr>\n
Dec. 19<\/td>\nJAPC<\/td>\nTsuruga-1<\/td>\nBWR<\/td>\nReactor automatically shut down due to lightning<\/td>\n<\/tr>\n
Dec. 20<\/td>\nTokyo-EPCO<\/td>\nFukushima I-6<\/td>\nBWR<\/td>\nStress reduction device stopped during operation to\u00a0reduce stress on control rod drive mechanism housing stub tubes during periodic inspection<\/td>\n<\/tr>\n
Dec. 26<\/td>\nJAPC<\/td>\nTsuruga-1<\/td>\nBWR<\/td>\nLeak detected at mechanical seal of\u00a0recirculation pump; reactor manually shut down on Dec. 28<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/tr>\n
\u00a0*Please note:<\/b>\u00a0The entries in bold type indicate either (1) that the incident was a reportable incident under
\nThe Regulation of Nuclear Reactors and Related Matters Act, or (2) that CNIC judged it to be an especially significant incident.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

DATE Operator Facility Name Type Short Description of Incidents Feb. 7 JNFL (Japan Nuclear Fuel Limited) Rokkasho Reprocessing Plant Reprocessing Plant Leak detected at fuel assembly transfer pit Feb. 12 Kansai-EPCO Takahama-1 Pressurized Water...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[17,4],"tags":[],"class_list":["post-527","post","type-post","status-publish","format-standard","hentry","category-accidentlist","category-data"],"acf":[],"_links":{"self":[{"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/posts\/527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=527"}],"version-history":[{"count":1,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/posts\/527\/revisions"}],"predecessor-version":[{"id":2289,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=\/wp\/v2\/posts\/527\/revisions\/2289"}],"wp:attachment":[{"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cnic.jp\/english\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}