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SVS System (SEVA) Self - Calibrating Sensors made with MI-Dry

 The Self-Validating (SEVA) Temperature Sensor

On March 28th, 1979, the nation awoke to the news of an accident at the 3 Mile Island Nuclear Power Station in Pennsylvania. For five tense days, there was concern that what started out as a minor problem would become a major catastrophe. Fortunately, technicians were able to solve the control problems and shut down the reactor although station would never again be usable.
 
In order to understand the cause of the accident, the Nuclear Regulatory Commission appointed a team of investigators to analyze the accident. One of the investigators was a scientist from the Hanford Nuclear Laboratory, an expert in temperature measurement.
 
In studying the incident, the scientist determined that a sensor failure was a major factor in the incidents leading up to the accident.   After the report was completed, the scientist decided that it was necessary to improve the reliability of the thermocouples that were pinpointed as one of the major causative factors of the accident.  
 
 In a book published a number of years later on the Three Mile Island incident, the author stated:
 
"Temperature measuring devices called thermocouples on many of the fuel assemblies, for example, gave some readings that were exceedingly high and others that were extremely low. This persuaded Miller and other Met Ed experts to disregard all the readings as unreliable, even though the high temperature readings turned out to be accurate.
 
The scientist studying the sensor failures had already been working on solving the perplexing problem of findinga a way to validate a thermocouple's readout.  Because the MetEd employees did not believe the high temperature readouts, they made decions that would ulitmately lead to the meltdown of the reactor.  studying the incident, the scientist determined that a sensor failure was a major factor in the incidents leading up to the accident.   After the report was completed, the scientist decided that it was necessary to improve the reliability of the thermocouples that were pinpointed as one of the major causative factors of the accident.  
 
The question asked that illustrated the problemwas: "You can always get a reading from a thermocouple, but what is the temperature?"  Although thermocoules are the workhorse temperature sensor of most industries, they have been notoriously unreliable, giving erroneous readings, exhibiting sudden failures, or drifting away from the true temperature over a period of time.  All of these problems can cause poor quality materials, reduce process efficiencies, and create safety issues, not to mention the cost of frequent replacement.
 
 
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