Japan Earthquake

Japan Earthquake | Page 982

@Edano @dean This should be good. That reactor vessel tilt overlay is disturbing...
by Rob in SF 5/5/2011 1:42:00 AM

@dean I've got an idea, just bury all the crap and run pipes around it and you would have "neo-thermal" and just use that.
by Jim Carver 5/5/2011 1:43:16 AM

@Scilla I suspect your stupid iPad will have smarter software soon...
by Rob in SF 5/5/2011 1:43:23 AM

@Jim Carver They are pretty adept at geothermal right nearby...
by Rob in SF 5/5/2011 1:44:07 AM

@Rob in SF It puts off alot of heat. I read that decay heat is responsible for about 20% of the energy released in a running reactor.
by Jim Carver 5/5/2011 1:45:59 AM

Edano I saw that read the other day and posted it.. no one had matched up the elevations for the RPV yet tho... interesting.. of course that was that one man's theory.. and I think he suggests the RPV is still intact only with what you show.. all the piping connections severed
by dean 5/5/2011 1:47:43 AM

@dean Do that use any of that heat from the SFP's to pre-heat the water?
by Jim Carver 5/5/2011 1:47:53 AM

no Jim.. seperate system as far as I know on commercials to go through heat exchanger and remove the total of approximate 3.5 MW of power for all the SFP elements..
by dean 5/5/2011 1:49:54 AM

@dean These old designs are so inefficient. You know they only use a small amount of the mass to actually produce energy. It's really a wasteful process.
by Jim Carver 5/5/2011 1:51:41 AM

right Jim, I'd like to see the temps on the turbine side to the condensor and see how much wasted heat there is there
by dean 5/5/2011 1:53:10 AM

TEPCO's preliminary time line through the end of installation of the final components to achieve the temporary core cooling, and all prior required functions, is shown below.

atomicpowerreview.blogspot.com
by smoss 5/5/2011 1:53:36 AM

@elainekirk Finally cam got right time, had to reboot my computer, and now it is working.
by Cat 5/5/2011 1:55:25 AM

@dean It's primitive..my car runs on ancient algae guts too.
by Jim Carver 5/5/2011 1:55:29 AM

FWIW: SOFCs are expected to be around 50%–60% efficient at converting fuel to electricity. In applications designed to capture and utilize the system's waste heat (co-generation), overall fuel use efficiencies could top 80%–85%. www1.eere.energy.gov
by Rob in SF 5/5/2011 1:57:06 AM

BWR operates at around 570F and 1000 psi steam.. Jim.. remember that bulk heating curve... the slope of the bulk boiling goes up and then approaches departure from nuclear boiling
by dean 5/5/2011 1:57:26 AM

the heat flux at the transition point "DNB".. is called the CRITICAL HEAT FLUX..
by dean 5/5/2011 2:02:55 AM

so like in our fuel.. we ensure that we stay in the nucleate boiling phase and stay 3 sigma from critical heat flux
by dean 5/5/2011 2:03:27 AM

In the boiling water reactor (BWR), the water which passes over the reactor core to act as moderator and coolant is also the steam source for the turbine. The disadvantage of this is that any fuel leak might make the water radioactive and that radioactivity would reach the turbine and the rest of the loop.

A typical operating pressure for such reactors is about 70 atmospheres at which pressure the water boils at about 285¡C. This operating temperature gives a Carnot efficiency of only 42% with a practical operating efficiency of around 32%, somewhat less than the PWR.
by dean 5/5/2011 2:04:56 AM

@dean I'm gonna have to think about that one a bit.
by Jim Carver 5/5/2011 2:05:00 AM

OK.. the heat flux is generated by the heat from the fuel..
by dean 5/5/2011 2:05:38 AM

this application is for fuel elements that are plates.. instead of the commercial tubular fuel ... the essentiallly the same theory..
by dean 5/5/2011 2:06:21 AM

@dean Trying to improve efficientcy might ...well you have no room to go out of design parameters.
by Jim Carver 5/5/2011 2:08:08 AM

they get alittle more efficiency out of PWR's because of the elevated temp at higher pressures but the PWR's are alot more expensive.. so the BWR's were chosen at the beginning
by dean 5/5/2011 2:09:15 AM

Seems to be steady source of white steam at ground level between #2 and stack
by Cat 5/5/2011 2:09:23 AM

but.. it's like you said at the beginning.. they are very inefficient
by dean 5/5/2011 2:09:32 AM

@dean Cool, got it, I guess there's some terms in there that I'm not familar with.
by Jim Carver 5/5/2011 2:09:38 AM

@dean I worked for this cement plant one time and it was designed in the Netherlands and they used every Calorie. 99.9% efficient.
by Jim Carver 5/5/2011 2:12:27 AM

won't take you long Jim... it's what we protect on the cladding for the fuel elements... the main thing on the fuel is to prevent DRYOUT.. where the temps surge
by dean 5/5/2011 2:12:34 AM

it's that amazing Jim how many foreign countries have it all figured out.. there is so much waste in USA
by dean 5/5/2011 2:13:05 AM

@dean I think the trouble with this industry is everything is so DIRTY, you can't get in there and even be around some of that stuff.
by Jim Carver 5/5/2011 2:14:29 AM

I can't think of anything nastier than fission products.
by Jim Carver 5/5/2011 2:15:36 AM

seems very smokey between cam and plant, maybe just dust storm, but I think smoke is blowing towards the cam
by Cat 5/5/2011 2:15:42 AM

yep.. the worst thing as far as contamination is ALPHA contamination.. you can't go through and decontaminate it without it traveling right behind you
by dean 5/5/2011 2:16:33 AM

@Cat Oh! I see that. Not sure if that is smoke from the plant rolling at the camera or clouds and fog. There was some of that yesterday morning for a while.
by Nancy 5/5/2011 2:16:40 AM

@Cat I have seen that smoke/steam with a very low point of origin a number of times. It seems to be coming from the spot where a bright flickering light was visible for quite a while earlier.
by Askwhy 5/5/2011 2:17:21 AM