Understanding nuclear: reactions, radioactivity, waste

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Christophe
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Understanding nuclear: reactions, radioactivity, waste




by Christophe » 17/03/11, 11:18

Yesterday I came across a very well done and accessible site to understand nuclear, atomic reactions, nuclear "chemistry", enrichment, waste: http://www.laradioactivite.com

Examples of particularly interesting pages (but they are really all!)

Natural radioactivity:
http://www.laradioactivite.com/fr/site/ ... urelle.htm

Nuclear medicine used:
http://www.laradioactivite.com/fr/site/ ... leaire.htm

Defects of the RBMK of Cherno: http://www.laradioactivite.com/fr/site/ ... s_RBMK.htm

The uranium cycle:
http://www.laradioactivite.com/fr/site/ ... ranium.htm

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Nuclear fuel is in France the subject of a whole cycle of operations and transformations, called the "nuclear fuel cycle". The first part - "upstream" of electricity production - involves the search for uranium deposits, mining, the concentration of uranium and its chemical conversion in the form of hexafluoride, its enrichment in isotope 235 and fuel fabrication. In "downstream" generation, the cycle includes reprocessing spent fuel, recycling of uranium and plutonium, and waste management.


Focus on spent fuel:
http://www.laradioactivite.com/fr/site/ ... esUses.htm

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A ton of fuel generally stays in the reactor for three years, during which the irradiation releases a very large quantity of energy. While 238 uranium remains largely intact, 25 kg on 35 kg of initial uranium-235 fissioned. 34 kg of fission products, 10 kg of plutonium and 800g of actinides are also found. All newly formed products are highly radioactive.


Presentation of the authors:

The three authors at the origin of the site are: Christian de la Vaissière (director of research at the CNRS) who is responsible and principal author, Jeanne Laberrigue-Frolow (research director emeritus at the CNRS) and Yves Sacquin (physicist engineer at the ECA).
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dedeleco
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by dedeleco » 17/03/11, 12:38

To have the complete list of past serious nuclear accidents from the announced disaster, read also:
http://www.dissident-media.org/infonucleaire/

http://groupes.sortirdunucleaire.org/alerte-japon/


They:
http://www.laradioactivite.com/fr/site/ ... ements.htm
only talk about induced cancers when there are many other uncatalogued effects, since DNA and proteins are cut into pieces and repaired, or else we die much less than natural radioactivity!
Proven on bacteria that live in pools of nuclear batteries with their DNA cut into short strands of 100 nucleotides and continually repaired !!!!

Given this repair mechanism the linearity of low dose effects is certainly much more complex depending on the individuals and the nature of the radiation!
A particle of one microgram of Plutonium (MOX fuel) in one lung is enough to induce cancer (worse than asbestos) and the measured dose will be practically zero.

There have been studies at low doses not mentioned. on this site near the lobby IN2P3, which informs but avoids all doubts and presents only certainties to know but to remain critical !!
Last edited by dedeleco the 17 / 03 / 11, 12: 56, 1 edited once.
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by Christophe » 17/03/11, 12:44

A little HS dede no?

There is also the list of wikipedia: http://fr.wikipedia.org/wiki/Accident_nucl%C3%A9aire

On your 1er link there is this: http://www.irsn.fr/FR/Actualites_presse ... nheim.aspx

On the night of Saturday 26 to Sunday 27 December 2009, the 2 reactor of the Fessenheim plant (Haut-Rhin) was being restarted, in a hot shutdown state, after a production shutdown. The loss of the reactor cooling system led to the initiation of the internal emergency plan (PUI) of the plant at 05h55, and the establishment of the national emergency organization by ASN, including the rigging of the Crisis Technical Center (CTC) of the IRSN. Thirty or so experts from the Institute quickly mobilized themselves at the Fontenay-aux-Roses and Vésinet sites.


When restarting a condenser cooling pump, a filter drum fed by the Alsace canal was damaged. This damage has led to the arrival of debris which have gradually clogged the heat exchangers of the safety source ensuring in particular the cooling of the intermediate cooling circuit.


Since the two channels of the cooling circuit are no longer available, EDF has applied the procedure provided to manage this type of situation. For this purpose, some equipment users of the cooling circuit have been relieved. Furthermore, the reactor was switched from the hot shutdown state (286 ° C - 155b) to the shutdown state at conditions close to those of commissioning the shutdown reactor cooling circuit. (177 ° C - 25b) using the steam generators that remained available.

This incident is similar to that of Cruas the 2 last December. However, its treatment was different because of the different design of the cooling system of the Fessenheim plant.

At the end of the afternoon, the IRSN considered that on the one hand the state of safety of the reactor was satisfactory and that on the other hand the actions (restoration of the filtering drum and cleaning of the dirty exchangers) and the monitoring put in place by EDF were adapted.

The national crisis organization was lifted by ASN at 17h15. EDF maintains its PUI until the return to a normal situation.


I do not seem to have heard about it on TV ... but I could be wrong ...
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by dedeleco » 17/03/11, 13:16

Not remember, because usual in France and in the world!
They must have said a few words at least locally !!

The problem is the certainty of infallibility, that everything has been thought out, planned, doubled, tripled, that we will avoid !!

While all nuclear, power plants, pools, the Hague do not support a long failure of cooling, even fuel at rest for more than 3 months!

In France the extreme risks are underestimated by taking only those listed instead of those attested by geology which prove that in France the frequency of these risks is 1 / 10 1 / 100 that of Japan, (the strength 9 with enormous tsunami of Japan in front of Sendai reproduces all the 1100 years) and the damage of the nuclear in the very long term obliges to take it into account, which is never done in France where we patch the security with each catastrophe, like a pierced basket !!!!!
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by Macro » 18/03/11, 09:23

You would have heard the fabric of atomic bullshit of my addo last night .... You would have fallen on the ass ....

Of course yesterday they were entitled to a stuffing of slack in the college .... There is no danger it is water vapor : Shock: : Shock: : Shock: : Shock: And anyway we can not do without or produce more properly ....

The physics teacher in question is said nuclear physicist that con ....

Arrival at the house of a friend schooled in another college ... Rebelotte ...

I think there was a memo in Orleans Tours Academy ....
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by Christophe » 18/03/11, 09:39

Macro wrote:I think there was a memo in Orleans Tours Academy ....


It is clear that this looks like propaganda ... but hey must say that you are "well supervised" in the area:

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: Cheesy:

M'enfin he can still make remedial courses on the site presented in this topic!

It will not be the 1ere gap in national education! : Mrgreen:
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by Christophe » 18/03/11, 09:54

Here they put a page on Fukushima: http://www.laradioactivite.com/fr/site/ ... ushima.htm

Addrelyn was right: we got 7% PN after shutdown:

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Megawatts to cool
Taking as a model the evolution of the heat release, after its shutdown, of a PWR reactor of 900 MWe, we estimated the decrease of the thermal power of an 700 MWe reactor of the Fukushima type according to the number of days since its cessation, that is, since the tsunami. The heat to be evacuated is of the order of ten megawatts. It decreases by about 50% from the first to the seventh day. Decay is slow, but on the fifth day the hardest may have passed.


This data is valid only with a non-degraded heart ... when it is partially melted I do not know if someone can know exactly how much it heats ...
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by Macro » 18/03/11, 09:57

We live at the O of Tours ... Whatever the winds we have water vapor above the head ... : Cheesy:
This con I think he will be entitled to a Macronology court at the next meeting parent prof ...
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by Macro » 21/03/11, 11:50

Well I got confirmation Friday night. There has been a pro-nuclear propaganda of state (or lobby) in our school last week ... In favor of our wonderful central France where it is impossible for a Fukunobyl to occur ... Because they are not built like nananinananana ...

Some managers of institutions were followed by other non ...

We are planning a new big lie ...
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by Leo Maximus » 21/03/11, 13:54

Hat (round) low with the Bretons who could avoid the construction of the Plogoff and Pellerin plants:

http://fr.wikipedia.org/wiki/Affaire_de_Plogoff

The Bretons show us that the best way to do it was not to enter it.

Beautiful posters and stickers here:

http://seaus.free.fr/spip.php?article22

Hat (round) down!

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