Nuclear: Another reactor vessel over too tight (Doel)

[chatelot16]

no need to worry about the cracks! just cool with solid water
https://www.econologie.com/forums/incroyable ... 11966.html
and there will be no more leaks

[Obamot]

It is possible, but everything depends on the viscosity of the gel, it would require ad hoc pipes. The best thing is to get out of nuclear power. That way there is no longer any need for cooling ...!

no, that's just the journalist with the con who just discovered this technique.

Sorry for the language I used but I'm just a little surprised that the nuke just discovered this process!



Does anyone know if it is the welds that are targeted or the metal (stainless steel) when knows that the weld creates tension that can crack with the temperature changes related to the operation of the reactor?

Therein lies the whole problem ... When you weld to repair it will never stop being repaired ... so weakened again and so on. I will not resume my last post, everything is there ... The constraints imposed on the materials exceed what we can calculate in static and resistance. But we have known that at least since the early seventies ...

[Flytox]

no, that's just the journalist with the con who just discovered this technique.

Sorry for the language I used but I'm just a little surprised that the nuke just discovered this process!

No, US control exists and has been well used for decades in the French nuke (in Switzerland probably also). There is know-how, the indications are sought / found but when the part to be scrapped costs millions of € (between the part, its replacement and the shutdowns), sometimes the managers take care of / force the decisions ... and the part can become good again, even if it means "influencing" the readings or the tolerances and the controllers (You, the subcontractor, the door is there!).

Does anyone know if it is the welds that are targeted or the metal (stainless steel) when knows that the weld creates tension that can crack with the temperature changes related to the operation of the reactor?

According to Obamot's link, these are welds (always the weak point):

https://kernenergie.bkw-fmb.ch/manteau- ... cteur.html

It is said:

Regularly controlled since then, these cracks are due to what is known as stress cracking corrosion, that is to say the conjunction of the effects of tension in the material associated with the chemical effects of demineralized water used in the reactor.

For those to whom this does not speak much:





The incriminated play

What is the function of the reactor core mantle?

The reactor core mantle is an open cylinder at both ends, made up of eight steel rings stacked on top of each other. Four of these rings each have two horizontally welded half-pipes. The mantle is used to channel the cooling water so that it circulates between the fuel elements. Surrounded by numerous safety barriers, the mantle is located inside the pressure tank, but is itself only subject to very low pressure. The mantle also stabilizes the components of the reactor core and can retain some of the radioactivity in the event of an incident.

The description of the problem seems to say that there is no danger and the pressure is very low. The problem is that the tension (mechanical forces) has nothing to do with the pressure for this cracking. It's a trick said to drown the fish, and if the part starts to tear, luckily we added straps / tie rods to support it and prevent / slow down its total tear over time .... "in the event of an incident", it will not be necessary to count on this mantle to contain "the best radioactive pieces".

Systematic evaluation of the coat and safety measures

To counter the formation of cracks on the coat welds, FMB decided in 1996 install four anchors as a preventive measure. These considerably reduce the load on the mantle and stabilize it. FMB will continue to assess possible additional measures for mantle maintenance and stabilization. It will also monitor the development of cracks using the most recent techniques to do this.

[the middle]

they found 10.000 cracks.

The number of cracks is not anecdotal: there are 10, including 000 concentrated in the bottom of the tank. The source of the problem could be found both in the steel supplied by Krup and in the manufacturing process of the Dutch tank manufacturer Rotterdam Droogdok, which has since disappeared. Nothing to cheer about the nuclear industry which could have to check more tanks than initially announced.

http://www.rtbf.be/info/belgique/detail ... id=7823187

[moinsdewatt]

Belgium authorizes GDF Suez to restart two nuclear power plants

THE WORLD | 17.05.2013

Stopped for long months following the discovery of microcracks on their tanks, the two reactors operated by GDF Suez in Belgium will finally be able to restart. The Belgian government, meeting in a restricted cabinet, had to give its authorization to this effect, Friday, May 17 in the morning.

The Doel 3 reactor in Flanders was shut down in June 2012, then Tihange 2 in Wallonia in September. Thousands of microalveoli had been spotted on their tanks using new techniques.

Their shutdown deprived the kingdom of a third of the 6 megawatts supplied by the Belgian nuclear industry, dominated by Electrabel, a subsidiary of GDF Suez.

The Federal Agency for Nuclear Control (AFCN) conducted long investigations, with the help of Belgian and international experts, not always in unison. Thursday, May 16, she presented the conclusions of her report to the Minister of the Interior, Joëlle Milquet, in charge of nuclear safety.

The Federal Agency is deciding to restart the two reactors, the microalveoli presenting, according to it, no danger. Electrabel defended the same point of view, evoking a manufacturing defect devoid of risk.

"The indications detected are defects due to hydrogen, not evolving, which appeared during the forging phase of the tanks, estimates the GDF Suez subsidiary. The structural integrity of the tanks and their resistance are not affected and meet all the requirements. safety criteria. "

The report insists, however, according to the newspaper Le Soir, on the need for "strict monitoring" of the condition of the tanks.
.....................

http://www.lemonde.fr/economie/article/ ... _3234.html

[Flytox]

The Federal Agency is deciding to restart the two reactors, the microalveoli presenting, according to it, no danger. Electrabel defended the same point of view, evoking a manufacturing defect devoid of risk.

"The indications detected are faults due to hydrogen, non-scalable, appeared during the forging phase of the tanks, estimates the GDF Suez subsidiary. The structural integrity of the tanks and their strength are not affected and meet all safety criteria. "

If it is ... there may not be more immediate danger than before, but in any case "hydrogen defects" necessarily lead to weakening / reduction in the life of the parts. incriminated. If it is, they will respect the new lifetimes calculated downwards and decrease the lifespan of their infernal machine accordingly. Wait and see ...... if we get there before the next Chernoshima

https://www.econologie.info/share/partag ... pN1nJU.pdf

[Christophe]

A leak was declared Tuesday evening in the Belgian Reactor 2 test reactor in Mol. According to the municipal authorities, the leak released no radioactivity and was sealed.

http://www.lesoir.be/298595/article/act ... leaire-mol

[chatelot16]

poultry farmers no longer know what to do with their eggs

the eggs are going very well to plug the water cooling leaks