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non-hetero

Ghost Town: Chernobyl.

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I'm always fucking thrilled to find good photos of modern day chernobyl. that whole concept of this huge ghost city amazes me. good find man.

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i had never seen photos of that place, very cool.

i'd like to take a ride through there...

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Guest BROWNer

dope dude, good find. i thought the thing about

silence was interesting.

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it would seem to be a great place to paint if it werent for the gaurds and insanely high radiation levels. none the less it is a pompei sort of place.

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right, the part about the silence was the most interesting. a whole city that was just abandoned with a sort of foreboding omnipotence.

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That is fucking sick... I never read about this before... and had no idea. It's kinda scary to think that there's chemicals that can contaminate areas for thousands of years. Which brings me to a question, which I don't think there's an answer to.... what neutralizes radiation other than the length of the halflife of a certain chemical?

 

Did you know that the uranium and [whatnot] that we use to make nuclear power in the US.... when it is depleted, it's still highly radioactive, they have these big cement cylinders that they fill fith these depleted chemicals and seal with more cement, then bury them deep in the earth. Imagine thousands of years from now when people find them...

 

 

 

edit: this quote literally gave me goosebumps....

 

"step in a new life, naked with no home, no friends, no money, no past and with very doubtful future."

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^^yeah, uranium has a half life of 760 million years. that doesn't mean that the radioactivity at Chernobyl has a half life that long....

 

Facts:

 

Natural uranium is a blend of two types : U-235 and U-238.

At a uranium enrichment plant, the concentration of U-235 is increased by discarding some U-238.

 

The cast-off uranium (mainly U-238), called ''depleted uranium'', has virtually no commercial value.

 

But there are several important military uses for depleted uranium

when placed in a reactor, it breeds plutonium -- a powerful nuclear explosive;

when incorporated into an H-bomb, it doubles the explosive power of the weapon;

when used to coat conventional bullets and shells, it makes them armour-piercing;

when used as a metallic alloy in tanks and other vehicles, it provides armour-plating.

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Info found on http://www.world-nuclear.org/info/chernobyl/inf07.htm

 

On 25 April, prior to a routine shut-down, the reactor crew at Chernobyl-4 began preparing for a test to determine how long turbines would spin and supply power following a loss of main electrical power supply. Similar tests had already been carried out at Chernobyl and other plants, despite the fact that these reactors were known to be very unstable at low power settings.

 

A series of operator actions, including the disabling of automatic shutdown mechanisms, preceded the attempted test early on 26 April. As flow of coolant water diminished, power output increased. When the operator moved to shut down the reactor from its unstable condition arising from previous errors, a peculiarity of the design caused a dramatic power surge.

 

The fuel elements ruptured and the resultant explosive force of steam lifted off the cover plate of the reactor, releasing fission products to the atmosphere. A second explosion threw out fragments of burning fuel and graphite from the core and allowed air to rush in, causing the graphite moderator to burst into flames.

 

There is some dispute among experts about the character of this second explosion. The graphite burned for nine days, causing the main release of radioactivity into the environment. A total of about 12 x 1018 Bq of radioactivity was released.

 

Some 5000 tonnes of boron, dolomite, sand, clay and lead were dropped on to the burning core by helicopter in an effort to extinguish the blaze and limit the release of radioactive particles.

 

 

 

---------------------------------

April 25: Prelude

01:06

The scheduled shutdown of the reactor started. Gradual lowering of the power level began

 

03:47

Lowering of reactor power halted at 1600 MW(thermal).

 

14:00

The emergency core cooling system (ECCS) was isolated (part of the test procedure) to prevent it from interrupting the test later.

 

The fact that the ECCS was isolated did not contribute to the accident; however, had it been available it might have reduced the impact slightly.

 

14:00

The power was due to be lowered further; however, the controller of the electricity grid in Kiev requested the reactor operator to keep supplying electricity to enable demand to be met. Consequently, the reactor power level was maintained at 1600 MW(t) and the experiment was delayed.

 

Without this delay, the test would have been conducted during `day shift'.

 

23:10

Power reduction recommenced.

 

24:00

Shift change.

 

 

------------------------------------

April 26: Preparation for the test

00:05

Power level had been decreased to 720 MW(t) and continued to be reduced.

 

It is now recognised that the safe operating level for a pre-accident configuration RBMK was about 700 Mwt because of the positive void coefficient.

 

00:28

Power level was now 500 MW(t).

 

Control was transferred from the local to the automatic regulating system. Either the operator failed to give the `hold power at required level' signal or the regulating system failed to respond to this signal. This led to an unexpected fall in power, which rapidly dropped to 30 MW(t).

 

00:32

(approximate time). In response, the operator retracted a number of control rods in an attempt to restore the power level.

 

Station safety procedures required that approval of the chief engineer be obtained to operate the reactor with fewer than the effective equivalent of 26 control rods. It is estimated that there were less than this number remaining in the reactor at this time.

 

01:00

The reactor power had risen to 200 MW(t).

 

01:03

An additional pump was switched into the left hand cooling circuit in order to increase the water flow to the core (part of the test procedure).

 

01:07

An additional pump was switched into the right hand cooling circuit (part of the test procedure).

 

Operation of additional pumps removed heat from the core more quickly. This reduced the water level in the steam separator.

 

01:15

Automatic trip systems to the steam separator were deactivated by the operator to permit continued operation of the reactor.

 

01:18

Operator increased feed water flow in an attempt to address the problems in the cooling system.

 

01:19

Some manual control rods withdrawn to increase power and raise the temperature and pressure in the steam separator.

 

Operating policy required that a minimum effective equivalent of 15 manual control rods be inserted in the reactor at all times. At this point it is likely that the number of manual rods was reduced to less than this (probably eight). However, automatic control rods were in place, thereby increasing the total number.

 

01:21:40

Feed water flow rate reduced to below normal by the operator to stabilise steam separator water level, decreasing heat removal from the core.

 

01:22:10

Spontaneous generation of steam in the core began.

 

01:22:45

Indications received by the operator, although abnormal, gave the appearance that the reactor was stable.

 

 

 

----------------------------

The test

01:23:04

Turbine feed valves closed to start turbine coasting. This was the beginning of the actual test.

 

01:23:10

Automatic control rods withdrawn from the core. An approximately 10 second withdrawal was the normal response to compensate for a decrease in the reactivity following the closing of the turbine feed valves.

 

Usually this decrease is caused by an increase in pressure in the cooling system and a consequent decrease in the quantity of steam in the core. The expected decrease in steam quantity did not occurdue to reduced feedwater to the core.

 

01:23:21

Steam generation increased to a point where, owing to the reactor's positive void coefficient, a further increase of steam generation would lead to a rapid increase in power.

 

01:23:35

Steam in the core begins to increase uncontrollably.

 

01:23:40

The emergency button (AZ-5) was pressed by the operator. Control rods started to enter the core.

 

The insertion of the rods from the top concentrated all of the reactivity in the bottom of the core.

 

01:23:44

Reactor power rose to a peak of about 100 times the design value.

 

01:23:45

Fuel pellets started to shatter, reacting with the cooling water to produce a pulse of high pressure in the fuel channels.

 

01:23:49

Fuel channels ruptured.

 

01:24

Two explosions occurred. One was a steam explosion; the other resulted from the expansion of fuel vapour.

 

The explosions lifted the pile cap, allowing the entry of air. The air reacted with the graphite moderator blocks to form carbon monoxide. This flammable gas ignited and a reactor fire resulted.

 

 

Thereafter, over nine days:

 

Some 8 of the 140 tonnes of fuel, which contained plutonium and other highly radioactive materials (fission products), were ejected from the reactor along with a portion of the graphite moderator, which was also radioactive. These materials were scattered around the site. In addition, caesium and iodine vapours were released both by the explosion and during the subsequent fire.

:(

 

 

http://www.world-nuclear.org/info/chernobyl/map2.gif'>

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These pictures bring tears to my eyes. I can't stress the horrors of nuclear power enough. I work with a child in our school system who was a victim of Chernobyl. His father was a resistance fighter at the time of the accident, and happened to be unfortunate enough to be caught in part of the fall out. He reproduced, had three children, all of which are intellectually and/or physically handicapped. The children were found about 7 years ago, abandoned living in a dump. Nuclear power.... :(

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Guest mikro137

this shit makes me really sad. i used to read alot on this accident as well as three mile island when i was a wee lad. fuck nuclear power.

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Well Actually, Chernobyl is in the Ukraine.

Yes. I heard that during the clean up period that they had loudspeakers in the streets playing music, so that the silence would not drive the workers insane.

God. This sucks. Humans are so stupid, I am ashamed.

People have no idea how things will effect the environment.

Ignorance is global.

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