ENENews: Officials now say Fukushima reactor with MOX fuel “leaked directly from containment”


Officials now say Fukushima reactor with MOX fuel “leaked directly from containment” — TV: Contamination of environment was due to “failure of vessel” — Experts: This has caused additional worries because MOX is more “radioactively aggressive” due to plutonium content (VIDEO)

Published: December 18th, 2015 at 7:03 pm ET
By ENENews
http://enenews.com/officials-fukushima-reactor-mox-fuel-leaked-directly-containment-vessel-tv-radioactive-contamination-environment-caused-failure-vessel-experts-caused-additional-worries-tepco-govt-because-mox-ra

http://www3.nhk.or.jp/nhkworld/english/news/20151217_27.html
NHK, Dec 17, 2015 (emphasis added): [TEPCO] says radioactive fallout that polluted the environment in mid-March of 2011 was likely caused by a leak directly from a containment vessel of the facility’s No.3 reactor. Officials… on Thursday reported their latest findings on what happened at the plant… They concluded that radioactive contamination of the environment between the night of March 14th and the 16th was likely caused not by the vent operations but failure of the vessel. They said the vessel likely lost airtightness due to heat from nuclear fuel, leading to the direct release of radioactive substances into the environment.


NHK transcript, Dec 17, 2015: [TEPCO] said the substances in one of the reactors probably leaked directly from the containment vessel… They suspect the heat of fuel caused the containment vessel to lose airtightness.

http://www.tepco.co.jp/en/press/corp-com/release/2015/1264512_6844.html
TEPCO, Dec 17, 2015: A significant release of steam from the night of March 14 to March 16, 2011 is believed to have been responsible for contamination to the surrounding environment of Fukushima Daiichi. The investigation reports that the primary containment vessels in Units 2 and 3 did likely lose leakage resistant properties by March 15 and had been in a condition where radioactive materials could leak directly from them. It is therefore presumed the environmental contamination outside Fukushima Daiichi during that period was caused by steam leakage directly from the primary containment vessels and not from the vent.

http://www.tepco.co.jp/en/press/corp-com/release/betu15_e/images/151217e0101.pdf
TEPCO, Dec 17, 2015: Leakage and release of a large amount of steam from the Unit 3 Reactor Building — The PCVs of Units 2 & 3 lost the airtightness in the end, which is confirmed by the fact that steam escaped from the Reactor Buildings. Analysis of the behavior of the pressure in the PCVs and the situation at the time of the accident has revealed that the environmental contamination from the night of March 14 to March 16 occurred by steam leakage together with radioactive materials directly from the PCVs not from the vent.

https://wikileaks.org/gifiles/attach/118/118095_Q%20Series%20-%20Nuclear%20Power.pdf
UBS Investment Research (via WikiLeaks), Apr 2011: Of particular concern was Unit 3, because, since September 2010, the plant had been fueled with mixed oxide, or MOx… Use of MOx heightened fuel risk — Fukushima Daiichi Unit 3 was fuelled with mixed oxide (MOx), which is about 93% uranium and 7% plutonium. This has caused additional worries for TEPCO and the government, because MOx is more radioactively aggressive. We think national nuclear safety reviews might consider restrictions on its use.

Watch NHK’s broadcast here

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ENENews: Boone Dam, from Brickey: “We’re doing a lot of engineering work and looking at repair options and what that might entail… I assure you there are a lot of people working on this.”

Huge radiation spike detected at Fukushima plant — Multiple records set near workers trying to stop nuclear waste flowing into ocean — Cesium up 7,500% this week »

Official: Fissures in earth now suspected under dam upstream of nuke plants — “There’s plenty of rumors… We’re considering all possibilities… Leak is actually in embankment, that’s where all the focus is” — Speculation that problem to go on for years — New drone footage shows excavation in progress (VIDEO)
Published: January 16th, 2015 at 9:40 am ET
By ENENews

http://enenews.com/officials-fissures-suspected-dam-multiple-nuclear-reactors-downstream-considering-all-possibilities-leak-actually-embankment-all-focus-plenty-rumors-speculation-repair-project-could-years-video?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ENENews+%28Energy+News%29

Follow-up to: ‘Sinkhole develops under dam in US — 7 nuclear reactors downstream — NRC notified of ‘stability issues’, plants begin evaluating potential flood impacts‘ and ‘Muddy seepage coming up near foundation of Boone Dam — Officials working around clock, using submarines and ground-penetrating radar

Boone BA 300x179

Bristol Herald Courier, Jan 14, 2015 (emphasis added): Water is still seeping at Boone Dam and the cause has yet to be determined… Boone Dam has two portions, a concrete portion [and] an earthen embankment. “The leak is actually in the embankment, that’s where all the focus is,” Travis Brickey, a spokesman for TVA, said Monday… TVA is currently drilling around the area where the units discharge water… Though there is no clear timeline on how long the investigation will take, Brickey said that it’s safe to say that there will be a project at the dam. But he’s not sure… how long the project will last or how it will impact the reservoir.

WJHL, Jan 12, 2015: TVA… says it plans to make an announcement about… water seeping out of a nearby riverbank near Boone Dam [after] what’s now being

    described as a “prolonged analysis” to find the source of the water moving underground… [TVA spokesman Travis Brickey] confirmed TVA engineers now suspect water is moving through fissures in rock under the earth-filled section of Boone Dam… TVA has lowered Boone Lake [to reduce] pressure on the dam [and] stopped passing water through its power-generating turbines at Boone Dam as a safety precaution… That’s forced TVA to release water [which is] shooting into the air… a highly visible water release that seems to have fired speculation about what’s going on at Boone Dam… TVA is non-committal about its plans to refill the lake in the spring. “It’s too soon to tell,” Brickey said.

    TVA spokesman Travis Brickey, Jan 12, 2015: “We are considering all possibilities and continue to analyze the data… We’ve installed additional monitoring equipment along with an extensive core drilling campaign… We’re aware that there are plenty of rumors… Our engineers are working to develop next steps.”

    More from Brickey: “We’re doing a lot of engineering work and looking at repair options and what that might entail… I assure you there are a lot of people working on this.”

    WCYB, Dec 29. 2014: People who visit Boone Lake won’t be seeing normal water levels any time soon… Brickey says that TVA is reviewing repair options on Boone Dam… But, the longer it takes for TVA to announce the plans, the more concerned many marina owners are becoming.

    Kingsport Times-News, Dec 29, 2014:“It’s all speculation,” Brickey said of rumors that the lake’s drawdown could last two years or longer… TVA’s most recent press [said] “reservoir levels could be lowered further if conditions change… The duration of the drawdown will depend on the results of the ongoing analysis.”

    Watch the WJHL broadcast here

    Published: January 16th, 2015 at 9:40 am ET
    By ENENews

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