| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Telephone System Quotes for Cat Soft LLC; Owen Jones on Twitter; Telephone System Quotes for Cat Soft LLC; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; NSA Hacked; Call Center Services for Cat Soft LLC; Very Good LRB Article on Brexit; Nussbaum on Anger; Credit Card Processing for Cat Soft LLC; Discover new movies on demand in our online cinema; Tasting; Credit Card Processing for Cat Soft LLC; Apple + Kiwi Jam; Hit Me; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; Call Center Services for Cat Soft LLC; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; Payroll Service Quotes for Cat Soft LLC; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result; Your diamond is a beaten up mess; Maths Books; Good Bike Route from Providencia / Las Condes to Panul\; Iain Pears (Author of Complex Plots); Plum Jam; Excellent; More Recently; For a moment I forgot StackOverflow sucked; A Few Weeks On...; Chilean Book Recommendations; How To Write Shared Libraries; Jenny Erpenbeck (Author); Dijkstra, Coins, Tables; Python libraries error on OpenSuse; Deserving Trump; And Smugness; McCloskey Economics Trilogy; cmocka - Mocks for C; Concept Creep (Americans); Futhark - OpenCL Language; Moved / Gone; Fan and USB issues; Burgers in Santiago; The Origin of Icosahedral Symmetry in Viruses; autoenum on PyPI; Jars Explains; Tomato Chutney v3; REST; US Elections and Gender: 24 Point Swing; PPPoE on OpenSuse Leap 42.1; SuperMicro X10SDV-TLN4F/F with Opensuse Leap 42.1; Big Data AI Could Be Very Bad Indeed....; Cornering; Postcapitalism (Paul Mason); Black Science Fiction; Git is not a CDN; Mining of Massive Data Sets; Rachel Kaadzi Ghansah; How great republics meet their end; Raspberry, Strawberry and Banana Jam; Interesting Dead Areas of Math; Later Taste; For Sale; Death By Bean; It's Good!; Tomato Chutney v2; Time ATAC MX 2 Pedals - First Impressions; Online Chilean Crafts; Intellectual Variety; Taste + Texture; Time Invariance and Gauge Symmetry; Jodorowsky

© 2006-2015 Andrew Cooke (site) / post authors (content).

Some Points Related to the Fukushima No. 1 Reactor

From: andrew cooke <andrew@...>

Date: Sat, 12 Mar 2011 18:29:37 -0300

First, a quick summary of what I understand has happened:

 - The reactor is water cooled, but the cooling is not
   passive/convective, so it's critical that there is electrical power
   for valves and pumps.  It cannot "fail safe" when there is no
   power.

 - Power is automatically cut on earthquakes, and the core shuts down.
   But heating continues for many hours.

 - There are two backup power systems - diesel generators and
   batteries.  At least the first of these failed, possibly due to
   flooding.

 - Lack of power meant that it was not possible to cool the reactor as
   normal, so the water in the core started to boil, raising pressure.

 - To avoid damaging the core, some steam was vented into the
   surrounding concrete container (the core is in a smaller steel
   container, inside).

 - Unfortunately, some kind of damage occurred inside the core.  I do
   not understand this completely, but the result was that hydrogen
   was generated.  This escaped with the vented steam.

 - The hydrogen ignited/exploded, destroying the outer concrete
   container, but apparently not the steel container around the core.

 - To cool the core it is now being flooded with seawater and boric
   acid.  The boric acid is a damper (it helps kill the nuclear
   reaction).

 - As I type this, there is also a problem with reactor 3.  The above
   is for reactor 1.

So, given the above, there are at least three obvious questions:

 1 Nuclear reactors that do not fail safe?  What the fuck?

 2 How much worse could this have been?  The diesel backup was running
   for the first few hours, when the core was hottest.  If the tsunami
   had been sooner (ie if the plant was nearer the epicentre) then the
   cooling would have failed at a more critical moment.  Would
   meltdown have been possible?

 3 What was the process that created the Hydrogen?  Not just the
   physical/chemical process (it seemed to be something standard, as
   commentators quickly identified "a hydrogen explosion"), but also
   the engineering damage that caused this.  Details here will affect
   the amount of radiation leaked.

Andrew

Re: your excellent blog

From: andrew cooke <andrew@...>

Date: Sat, 12 Mar 2011 20:05:00 -0300

Hi - thanks for these (my dumb old blog software was confused by your modern
email that included HTML so I am forwarding your comment as quoted text).
Andrew.

From: Gerry Newby <gerrynewby@...>
To: "compute+SomePoints0@..." <compute+SomePoints0@...>
Subject: Re your excellent blog

http://www.tepco.co.jp/en/press/corp-com/release/11031233-e.html

http://www.world-nuclear-news.org/RS_Battle_to_stabilise_earthquake_reactors_1203111.html

Hydrogen Source

From: andrew cooke <andrew@...>

Date: Sat, 12 Mar 2011 21:32:46 -0300

The Guardian says that "At 1,200C (2,200F), the zirconium casings of the fuel
rods can react with the cooling water and create hydrogen" which suggests that
was the source of the gas that exploded.  So this is more serious than initial
reports suggested and the word "desperate" is now being used to describe the
use of sea water for cooling.

Andrew

Good Article on Explosions

From: andrew cooke <andrew@...>

Date: Tue, 15 Mar 2011 17:52:59 -0300

http://mitnse.com/2011/03/15/explanation-of-hydrogen-explosions-at-units-1-and-3/

Andrew

Comment on this post