MOD: Question on planet condition change plant

[StarBaseSweeper]

However after 1 full year with the facility, the condition is still optimal , so I am thinking it may be impossible to set negative value?
EDIT:
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 := 2
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 Conditions
Ability 2 Descr := The condition of the planet is getting worse with time (100%).
Ability 2 Val 1 := -100
Ability 2 Val 2 := 0
EDIT2: add smiley

[ June 16, 2004, 22:19: Message edited by: StarBaseSweeper ]