I tried, still not.   
 
  
I tried less, still not.   
 
     
  
My guess is that it is possible to change the condition of a planet negatively only with events or weapons, not with facility. Or I am really having something stupid and wrong that I can't find out..
Name                := Deep Radioactives Refinerie I
Description         := Large fusion reactors which process a planet's deep ore to generate refined high-energy 
materials.
Facility Group      := Resource Extraction
Facility Family     := 5
Roman Numeral       := 1
Restrictions        := None
Pic Num             := 61
Cost Minerals       := 2500
Cost Organics       := 0
Cost Radioactives   := 0
Number of Tech Req  := 1
Tech Area Req 1     := Radioactives Extraction
Tech Level Req 1    := 1
Number of Abilities := 3
Ability 1 Type      := Resource Generation - Radioactives
Ability 1 Descr     := Extracts 150 radioactives each turn.
Ability 1 Val 1     := 150
Ability 1 Val 2     := 0
Ability 2 Type      := Planet - Change Organics Value
Ability 2 Descr     := Plants are slowly destroyed by high radioactivity (1%).
Ability 2 Val 1     := -1
Ability 2 Val 2     := 0
Ability 3 Type      := Planet - Change Conditions
Ability 3 Descr     := Plants are slowly destroyed by high radioactivity (1%).
Ability 3 Val 1     := -50
Ability 3 Val 2     := 0