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This is a fictional account, based on the facts of the disaster at the Chernobyl Nuclear Power Facility. The names have been changed to protect the innocent. :P USSR - Officials stated in a report today, that at roughly midnight, in preparation for testing, power levels on a reactor at one of their Nuclear Power Facilities had been decreased to 720 MW(t) and continued to be reduced to 500 MW(t) over 30 minutes. Control was transferred from the local regulating system to the automatic regulating system, but either the operator failed to give the signal to hold power at required levels or the regulating system failed to respond to this signal, leading to an unexpectedly rapid decrease in power to 30 MW(t). Spokesman for the plant indicated that in response, the operator retracted a number of control rods in an attempt to restore the power level. Within 30 minutes, the reactor power had risen to 200 MW(t) and, as part of the preparations for testing, an additional pump was switched into the left hand cooling circuit in order to increase the water flow to the core. Shortly after that, an additional pump was switched into the right hand cooling circuit. This was also part of the testing procedure and operation of additional pumps removed heat from the core more quickly, reducing the water level in the steam separator. At approximately 1:15 am, automatic trip systems to the steam separator were deactivated by the operator to permit continued operation of the reactor and feed water flow was increased in an attempt to address the problems in the cooling system. Some manual control rods were withdrawn to increase power and raise the temperature and pressure in the steam separator.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 thought that that the number of manual rods was reduced to eight. Automatic control rods were in place however, thereby increasing the total number. Feed water flow rate was reduced below normal by the operator to stabilize steam separator water level, decreasing heat removal from the core. Spontaneous generation of steam in the core began. The reactor seemed stable at this point and all stations were on standby for testing. The indications received by the reactor operator, although abnormal, gave the appearance that the reactor was stable and at 1:23 am, testing commenced. Initially, turbine feed valves were closed to start turbine coasting and automatic control rods were withdrawn from the core. Officials stated that this 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.
Thirty seconds into the test, the steam in the core began to increase uncontrollably and 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. The reactor power rose to a peak of about 100 times the design value, fuel pellets started to shatter, reacting with the cooling water to produce a pulse of high pressure in the fuel channels, in turn rupturing them. Thirty seconds later, and one minute after the test had been started, two explosions occurred. One was a steam explosion; the other resulted from the expansion of fuel vapor. 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. Officials are not commenting futher at this point, but experts from the scientific community tell us that it is likely that some 80 of the 140 tons 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 vapors were released both by the explosion and during the subsequent fire. In addition, they say that this deadly mixture of fission products and vapors have also been ejected into the upper atmosphere. They believe that prevailing winds will scatter it around the globe over the next several weeks in a sort of band of radioactive storm that will leave only desolation in it's wake. Though minimal damage is expected in our area, this cloud of phallout will definitely drift through on the night of November 18, 2005. Officials are urging everyone to take shelter from the hours of 9 pm until 5 am. Unfortunatley, in anticipation of mass panic, officials have refused to release the location of the shelter until a day or two prior and are advising everyone to begin preparations immediately. Tune to Message Forum Thread T1943 on this site for immediate Shelter information, as soon as it is available. Directions will be provided from your location. In addition, information will also be provided in the calendar section to help facilitate a broader range of information distrubution. Tell Everyone You Know! There's Not All Bad News Though...
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PHALLOUT
Spokesmen
indicated that the expected decrease in steam quantity did
not occur due to reduced feed water to the core. Steam generation
had increased to a point where, owing to the reactor's positive
void coefficient, a further increase of steam generation
led to a rapid increase in power. 
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