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Super amazing! Technically correct and showing the flow path is incredibly rare and super helpful! The effort put into this is top-notch. Amazing, I will be watching much more.
Very interesting video. Looking forward to the whole power series. I would like to see how a condensing turbine works if you could throw that as a side bar of your turbine video that would be amazing. I also appreciate the quality of work that go into your videos, top notch!
The power plant series is mostly finished. If you check courses.savree.com in a few weeks, you will see all the power videos grouped into a course. FGDs, ESPs, feedwater systems, steam drums etc. It's all there.
I would like to have seen a cross section of these "Steam Separator Pipes", as well as hear or see what's in the space that surrounds those pipes. With a vigorous boil, it would seam that the steam would simply blow the entrained water out the top of them, having too much momentum to let the water fall back through the upward stream. It doesn't appear that there is much margin for sidelined water in this system either, but if the enlarged end of these pipes allows separated water to fall back into this surrounding space, and somehow get back to the top of the boiler, then that top part could act as a measurable buffer for controlling the makeup water.
The pipes in the separator cause the steam/water mixture to spin, throwing the water out laterally as it exits the separator. The dryer then handles what's left.
It does not explain why this is better than a pressurized water reactor. Nor does it say that the vapor phase has positive feedback. It is therefore difficult to control. Nor does it say that the turbines in this type receive radioactive steam. Therefore, there is also significant radiation in the turbine engine room. This effect is not present in the pressurized water reactor.
The steam/water froth exiting the top of the core is only around 10% steam. It is not "difficult to control." And yes, turbine building access is controlled for radiological protection purposes. Big deal......we know how to do that.
@@knockleznuclear power literally is just this, nuclear reaction generates heat and this is one of the only ways to turn that into electricity more efficiently
I like the video and want to use it as a reference for a college class assignment. I do not see the date this was provided or the author of the video to be able to cite this as a reference. Can you add more information for this purpose?
But you didn't show that the control wheels are not cylindrical, they are cross-shaped and it's also called control blades, in 12:41 you can see this. But overall the video is good.
The containment must be massive since the primary coolant is going directly on to the turbines then down to the condensate tank and on to the condensate pumps. PWR guy here, so please forgive the lack of engineering imagination.
The pressure boundary of the containment building includes power operated main steam isolation valves with redundant automatic closure functions as described in the plant safety analysis.
Like for actually say that the coolant is the primary way to control the rate of reaction daily instead for control rod. In fact, control rod is more for balance the fuel burn rate across fuel assembly and offset the reactivity of the fuel. Another way to control the rate of reaction is to add boronic acid to the coolant, which is the active ingredient of control rod. This two ways is the main way to control the reactor. Although most of the nuclear power is assigned to generate the base load of the grid, so always run on its full capacity.
Simplify this: "regulation" is effectively a loss. Because the adsorbed neutrons are lost, they will no longer be involved in further energy production.
@@Akol56Peter to be clear these neutrons are not actually adding to the total energy. They just continue the reaction. It's like saying that using half throttle is wasting gas, you're not wasting it you're just not using it until later. Sure you could put out more power but you're using half the power and half the gas to do it. In this case it's using less of the fuel so it doesn't have to be refueled as fast. If it runs at half load it can run for a bit longer.
@@pilotavery Ok thanks for the answer I understood, because until now it was only a "control" that by capturing neutrons they lost their split effect. The end result is a bit similar to breeder reactors. But with those it is still, technically difficult to handle, that the specific energy density per unit volume is an order of magnitude higher.
Very educational video! Thank you for posting. I understand the jet pump is used to allow the feed water to mix with the recirculation water and act as a coolant, but I am wondering why can't you have the feed water pressurized and sent directly to the reaction chamber (instead of going to the jet pump). What's the benefit of using the jet pump?
One bad thing with a BWR compared to a PWR is the turbines are directly exposed to the reactor coolant where PWR this is on a secondary water system. So when doing turbine work on a BWR the RAD suits have to come on.
not entirely true, the turbine area is shielded during operation. When it is time for servicing of the turbine there is a waiting time for any radioactivity to decay away. Then it is serviced like any other steam turbine.
@@SootyMangabey. Correct very short lived after shutdown. They do still however put the suits on as a precaution since directly exposed to the steam. But not dangerous in almost all cases.
@@JisINSANE3It’s not like the water carries uranium particles out of the core; the radionuclides in the cooling water are the product of neutron activation of the water itself. These light radioactive isotopes are very short-lived, with half-lives of the order of seconds or less. Most of them also put off easily-shielded types of radiation like beta particles. So all they have to do is wait a small amount of time after shutdown for those to decay, and then they can safely access the turbines for whatever maintenance or inspections are required.
Isn't Canada Deutereium Uranium (CANDU) reactor a late generation BWR? However a goof loyal patriotic American, I stick with Rickover's Pressurized Water Reactor. Simple, safe , reliable. Naval Reactors version does use enriched U fuel. But civilian PWR use 3-4% enriched fuel.
All nuclear systems create Wet steam as they don’t have a super heat section. The turbines and housings are in terrible shape when then open them for service, due to the wet steam.
Steam supplied to the high pressure turbines has a moisture content less than 0.1%. HP turbine exhaust passes through reheaters before entering the LP turbines. They run for years on end.....not in "terrible shape."
Zirconium, boron, cadmium, silver, hafnium, or indium... or all combined together into one alloy, that is made, to be resistant, to corrosion, pressure, temperature... and safe can get in/out the core in any thermal power, condition.
The radioactive steam, 1 loop basically, gets direct contact with turbine, and re-heater?! Its make the turbine radioactive too? PWR got 3 loops, 1st reactor, 2nd steam generator, 3rd condenser. Anyway... Still thinking that, PWR's, is safer, than BWR's. IMHO...
PWRs are nice because they do have the secondary loop, however the downside (not severe, but if we were more concerned about proliferation) is that it does require a higher enrichment. Since steam itself carries only a small percentage of radioactivity (mostly in the impurities and minerals from the system), the turbine area will be warm, but not hot to the levels you would see in a PWR. The big downside is that it is not as fool resistant because a PWR will develop voids to help slow the event, while a BWR needs the added boron to slow it in a runaway. NRC has some pretty cool diagrams and such.
Entrained in the steam is nitrogen-16, which is created by neutron bombardment of free oxygen atoms which resulted from the radiolytic decomposition of water. N-16 has a very short half-life, and it's decay releases a high-energy gamma particle, making the area around the steam pipes and the turbines a high radiation area during power operation. It is not present when the reactor is shut down.
I am eagrly waiting for upcoming videos about engineering field and also i am intersted in all branches of enginering field. Right now i am in 4 th year engineering course in India from Maharashtra in Mechanical Engineering branch
It would be very helpful if you'd clarify the intended audience right at the start. It seems to me it's likely to be first year university engineering students. Delivery is somewhat bland and monotonous. It doesn't really seem engaging - compare this with the Illinois Energy Prof. Yes I know he's aiming at beginners but he really does engage his audience.
