Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus i
 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign
 sum of admittances connected at bus j

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Power Systems
In boiler water reactor (BWR)

  all of above.
 there is danger of radioactive contamination of steam.
 the feed water acts both coolant and a moderator.
 enriched uranium is used as fuel.

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