[ RadSafe ] Fwd: [New post] Tepco under-reported Fukushima release of plutonium - by 200 times!
Miller, Mark L
mmiller at sandia.gov
Fri Aug 8 12:25:30 CDT 2014
"Trillion" sounds like a fearful amount of anything (especially Pu, as Roger points out). Funny how much less ~7,000 Ci sounds instead (correct conversion?). BTW, any amount of material released from the fuel itself is irrelevant if a pathway to human health and the environment cannot be demonstrated. In fact, actual field samples assayed for all isotopes (including Pu) demonstrated that very little Pu actually left the reactor site itself.
From: Roger Helbig [mailto:rwhelbig at gmail.com]
Sent: Friday, August 08, 2014 4:37 AM
Subject: [ RadSafe ] Fwd: [New post] Tepco under-reported Fukushima release of plutonium - by 200 times!
Is there any fact in this assertion? Since Plutonium does not boil off, how is it supposedly released from the crippled reactor? The anti-nukes constantly focus on uranium and plutonium because those two elements trigger fear in large numbers of people and they are masters of the art of creating and manipulating fear.
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From: nuclear-news <comment-reply at wordpress.com>
Date: Fri, Aug 8, 2014 at 12:05 AM
Subject: [New post] Tepco under-reported Fukushima release of plutonium - by 200 times!
To: rwhelbig at gmail.com
Christina MacPherson posted: "New report estimates 278 trillion Bq of plutonium released from Fukushima reactors -- Over 200 times higher than amount reported by Tepco -- "Highly radiotoxic when incorporated into human body" as it decays http://enenews.com/new-report-estimates-278-trill"
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New post on nuclear-news
Tepco under-reported Fukushima release of plutonium - by 200 times!
by Christina MacPherson
New report estimates 278 trillion Bq of plutonium released from Fukushima reactors -- Over 200 times higher than amount reported by Tepco -- "Highly radiotoxic when incorporated into human body" as it decays http://enenews.com/new-report-estimates-278-trillion-bq-of-plutonium-released-from-fukushima-reactors-over-200-times-higher-than-amount-reported-by-tepco?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+ENENews+%28Energy+News%29
Evaluation of the Fukushima Accident Source Term through the fast running code RASCAL 4.2(pdf),ENEA Bologna Research Centre, May 23,
2014: This Report presents the results of the application of the fast-running US-NRC direct code RASCAL 4.2 to the estimation of the Fukushima Source Term. [...] it is plausible that the ventings that TEPCO announced during the accident as being conducted from the wetwell were, as a matter of fact and because of the degraded conditions of the plants, conducted actually from the drywell. [...] wetwell properties imply releases which can be several oder of magnitudes lower than those from the drywell [...] it can clearly be seen that the most probable path is the combination of Drywell+Direct option [...] the true venting path, i.e. from Drywell instead of from Wetwell, is an extremely important issue. [...] in several instances when TEPCO tried to operate venting, in order to release pressure outside the building through the stack, it proved impossible [...] there are many indications that probably the radioactive material escaped from the drywell; this may have occurred without TEPCO's immediate knowledge and because of several factors; for example: structural damages to the pipings connecting drywell to torus room (vent piping bellows), due either to the earthquake, and/or to the too violent pressure and temperature increase in the D/W; leakages through the top head manhole, the top head flange, the piping penetrations, the electrical wiring penetrations, the personal airlocks, the S/C manholes, the machine hatches, etc. [...] The value of 1%/h was chosen by ENEA because of the possible highly damaged conditions of the Fukushima NPPs due to the BDB [Beyond Design Basis] earthquake.
> Table 7. Cumulative Source Term (Bq) TEPCO MELCOR
Pu-241 Total = 1.2E+12 (1,200,000,000,000 Bq)
> Table 7. Cumulative Source Term (Bq) ENEA RASCAL 4.2
Pu-241 Unit 1 = 6.52E+13 (65,200,000,000,000 Bq)
Pu-241 Unit 2 = 1.86E+14 (186,000,000,000,000 Bq)
Pu-241 Unit 3 = 2.67E+13 (26,700,000,000,000 Bq)
Pu-241 Total = 2.78E+14 (278,000,000,000,000 Bq)
Environmental Science & Technology (American Chemical Society), July 11, 2014: [S]tandard alpha spectrometry techniques [...] are not able [...] to measure 241Pu.
Boreal Environment Research (pdf), Feb. 28, 2014: The 241Pu isotope was introduced into the environment from [...] accidents that released nuclear reactor fuel, such as [...] the 2011 Fukushima catastrophe. As compared with other Pu isotopes in the environment that are alpha-emitting and long-lived, 241Pu is a short-lived isotope with a half-life of 14.35 years [...] 241Pu decays to the alpha emitter 241Am, that has a much longer half-life (432.2 years) and is highly radiotoxic when it is incorporated into either the human or animal body. [...] The 241Pu isotope has been studied less extensively than the α-emitting Pu isotopes for several reasons. Activity concentration of 241Pu cannot be determined from the same alpha spectrum as the Pu isotopes 238, 239, and 240, and extra effort is needed in order to analyze 241Pu concentration of a sample. Actually, 241Pu emits alpha particles, but they have so low probability (0.002%) that 241Pu cannot be measured directly by α-spectrometry [...]
See also: Japan TV: Radiation release during 'venting' was up to 500 times larger than thought for Fukushima reactor -- Surprising surge in radioactivity before explosions (VIDEO)
Christina MacPherson | August 8, 2014 at 7:05 am | Categories:
Fukushima 2014 | URL: http://wp.me/phgse-hQz
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