Post by Marc BissonnetteGive me a break. I live about 1/2 hour from AECL, the reactor of which you
speak. Several employees who work there happen to be my neighbours. That
enitre "safety" thing was nothing more than political backbiting.
Would they have anything do with those white elephant "Maple" reactors,
the ones that were supposed to replace the obsolete reactor, but will
never go into operation because the design, as implemented, has a positive
Coefficient of Reaction? That is, the reactivity increases as the reaction
rate increases, instead of declining.
http://www.newsvine.com/_news/2008/05/16/1493652-canada-scraps-medical-isotope-reactors-plan
http://www.world-nuclear-news.org/NN-AECL_halts_development_of_MAPLE_project-1905082.html
http://ontario-geofish.blogspot.com/2007/12/primer-aecl-maple-reactors-mds-and.html
Thanks for illustrating why inspectors can't trust employees of companies
to make honest and accurate statements.
I'll take the regulator's view, and the view of nuclear engineers in other
countries, over anything AECL has to say about itself.
Do you remember the scandal a few years back when one of AECL's own welding
inspectors found that all of their welders needed remedial training because
none of them could make a closing weld that would pass inspection? AECL's
response was to put that inspector in a room with nothing to do until he
quit in disgust.
http://www.healthimaging.com/index.php?option=com_articles&view=article&id=10891
"The Office of the Auditor-General has estimated it would cost $600
million to refurbish the Chalk River site and bring it to modern
standards, including an undisclosed investment in the research reactor
itself, according to Globe & Mail."
Are you old enough to remember when Automakers claimed that seat belts,
padded dashboards, and flush mounted door latches weren't needed? One senior
auto engineer said on TV, with apparent sincerity, that he regularly
conducted brace exercises with his family in the car. That is, he would
shout "crash" as he was driving and his wife and kids were supposed to
brace themselves as best as they could. He assured TV viewers that this
was just as good as having seat belts and a padded dashboard.
Post by Marc BissonnetteWasn't the primary backup
Nor was it the secondary backup.
Nor was it the tertiary backup.
It was the *fourth level* backup power system.
The data center where the applications I work with run has a UPS with
lead acid batteries capable of running it for over half an hour, and 2
diesel generators, each of which is supposed to be able to run the data
center by itself. On Thanksgiving Sunday all the servers crashed after
45 minutes. One of the generators wouldn't run under load (weekly tests
are Non Load) and the other didn't generate enough power to keep the
batteries charged. Instead of quiescing and shutting down all the z/OS,
AIX, *IX and windows servers while there was still power they let everthing
run until the batteries drained.
The only thing funnier than no-nuke kooks spouting nonsense about a
subject they know nothing about is pro-nuke kooks who know a lot less
than they think they do. One in my 4th year physics class insisted that
if anything went wrong the control rods would move by gravity into a
position which would stop the reaction, end of story.
I referred him to one of my 2nd year profs, who had resonded to a student's
mention of Bessel functions with an ad hoc lecture about his days at Chalk
River, where he was involved in the analysis of power oscillations caused by
the cylindrical geometry and the fact that some of the reaction products
absorb neutrons, leading to oscillation as they absorb and decay. He also
discussed how certain transient reactor conditions during an uncontrolled
shut down can "poison" the fuel by producing exceptional amounts of neutron
absorbing fission products, or neutron absorbing decay products.
There is also the issue of heat produced by the fission and neutron absorption
products generated while the reactor was operating. They continue to decay
and produce dangerous heat long after the fission reactions stop.
On top of all that there is the matter of pipes for water, control rods,
and fuel bundles tending to bow, widen or bend from thermal expansion or
overpressure, even if there isn't a melt down, just a period of operation
at temperatures above the design limit.
A lot of corners were cut during the 1950s Cold War era. Those practices
should not be tolerated in reactors operating today.