I want to modify nuclear plant:

I want add +1 in production, in xml file Civ4buildingsinfo which is the parameter to modify?

Thanks

Change:

<YieldChanges/>

To:

<YieldChanges>
<iYield>0</iYield>
<iYield>1</iYield>
<iYield>0</iYield>
</YieldChanges>

and for modify % of production of nuclar plant ?

and for modify % of production of nuclar plant ?

After what you've already added:

<YieldChanges>
<iYield>0</iYield>
<iYield>1</iYield>
<iYield>0</iYield>
</YieldChanges>

Add the following:

<YieldModifiers>
<iYield>0</iYield>
<iYield>X</iYield>
<iYield>0</iYield>
</YieldModifiers>

Where X is the % bonus to give to the city.

but if i modify with 25 is 25 production shield not 25%... modify the same place why?