On Jun 8, 9:41=A0am, dpb <[email protected]> wrote:
> Zz Yzx wrote:
> > In response to dpb's response to Grover's post re: "Slow day in the
> > cabinet shop"
>
> >http://www.youtube.com/watch?v=3DyjXTOlsE8k0
>
> Slow dialup so insufficient bandwidth...
>
> But, thanks... :)
>
> I thought about it some but knew Robotoy has fair amount of utility
> background and also figured if anybody else cared they could always
> ask... :)
>
> Let's see, what terms that aren't at least fairly widely used did I
> throw in there??? =A0One that comes to me that is likely a stretch is
>
> DNBR -- Departure from Nucleate Boiling Ratio. =A0It's the ratio of the
> local heat flux over the critical heat flux at which boiling on the
> surface of the fuel pin switches from local to film regime. =A0"Nucleate"
> boiling is that type you've seen in a pan on the stove when it first
> starts with those individual steam bubbles that are released. =A0If
> continue to heat the surface it will switch over to a general boiling at
> which point the effective heat transfer coefficient drops dramatically
> owing to the steam film between the surface and the liquid. =A0This has t=
o
> be avoided in a PWR (pressurized water reactor) to prevent fuel pin
> cladding failure so it's a limiting design criterion on the operational
> power density. =A0BWRs (boiling water) reactors operate at about half the
> pressure (roughly 1000 psi as opposed to 2200 psi) and allow for bulk
> boiling and more area by many more but smaller diameter fuel pins. =A0The
> lower pressure means a lower boiling point temperature and in
> combination w/ the added surface area the cladding is also ok.
>
> Now that have undoubtedly bored completely I'll retreat... =A0:)
>
> --
You haven't touched on the surface treatment of zirconium fuel bundles
and its effect on filming... in D2O. <G>
My utility background is Protection & Control and spent 3 years
creating a 3D acoustic model of one of the units at the RL Hearn GS in
Toronto. That work brought me to the National Research Council in
Ottawa where I spun off into researching psychoacoustics. That work
became the basis for creating a line of loudspeakers, which in turn
got me involved with mass-production of wooden boxes, tossing in a few
kitchen cabinets during slow times, and presto..tadaaa...
BTW, solid surface makes a wonderful speaker box.
"Zz Yzx" wrote:
> In response to dpb's response to Grover's post re: "Slow day in the
> cabinet shop"
>
>
> http://www.youtube.com/watch?v=yjXTOlsE8k0
---------------------------------------
If you can't dazzle them with brilliance,
Baffle them with bull shit.
Lew
Who is accepting orders that are accompanied with suitable non
refundable deposit and non specified future delivery.
Zz Yzx wrote:
> In response to dpb's response to Grover's post re: "Slow day in the
> cabinet shop"
>
>
> http://www.youtube.com/watch?v=yjXTOlsE8k0
>
Slow dialup so insufficient bandwidth...
But, thanks... :)
I thought about it some but knew Robotoy has fair amount of utility
background and also figured if anybody else cared they could always
ask... :)
Let's see, what terms that aren't at least fairly widely used did I
throw in there??? One that comes to me that is likely a stretch is
DNBR -- Departure from Nucleate Boiling Ratio. It's the ratio of the
local heat flux over the critical heat flux at which boiling on the
surface of the fuel pin switches from local to film regime. "Nucleate"
boiling is that type you've seen in a pan on the stove when it first
starts with those individual steam bubbles that are released. If
continue to heat the surface it will switch over to a general boiling at
which point the effective heat transfer coefficient drops dramatically
owing to the steam film between the surface and the liquid. This has to
be avoided in a PWR (pressurized water reactor) to prevent fuel pin
cladding failure so it's a limiting design criterion on the operational
power density. BWRs (boiling water) reactors operate at about half the
pressure (roughly 1000 psi as opposed to 2200 psi) and allow for bulk
boiling and more area by many more but smaller diameter fuel pins. The
lower pressure means a lower boiling point temperature and in
combination w/ the added surface area the cladding is also ok.
Now that have undoubtedly bored completely I'll retreat... :)
--
Robatoy wrote:
...
> You haven't touched on the surface treatment of zirconium fuel bundles
> and its effect on filming... in D2O. <G>
Chuckle...
And from a guy that thinks thick-wall tubing for supercritical steam is
"too costly" to be practical... <gd,r)
> My utility background is Protection & Control and spent 3 years
> creating a 3D acoustic model of one of the units at the RL Hearn GS in
> Toronto. That work brought me to the National Research Council in
> Ottawa where I spun off into researching psychoacoustics. That work
> became the basis for creating a line of loudspeakers, which in turn
> got me involved with mass-production of wooden boxes, tossing in a few
> kitchen cabinets during slow times, and presto..tadaaa...
> BTW, solid surface makes a wonderful speaker box.
I started in core design at B&W at time of physics model qualification
for NRC licensing, moving to internal R&D organization for primarily
incore instrumentation and related "statistical core design" stuff.
After McDermott bought B&W R&D didn't look promising so ended up in Oak
Ridge w/ new consulting office of mostly ex-B&W folks. Evolved towards
I&C stuff for the fossil utilities as nuclear work got to be leaner,
finally spending last years mostly through EPRI at the I&C Center (now
disbanded) located at TVA Kingston (TN) Fossil. Much variety along the
way including a stint of robotics for Remotec, the online coal/sulfur
analyzers and last major project was flow sensor for pulverized coal
using ultrasound via high-frequency accelerometer and advanced nonlinear
signal processing. Then, just when was getting really tired of the
one-man, one-shop gig, Dad had unexpected heart attack and Mom a stroke
at the same time and so here am back on the family farm 40 yrs later.
That's been 10 years now...
--