Attack on Windscale
Platform: Commodore 64
Gametype: Undefined
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Arcade shoot-em-up and Adventure set in the UK's most notorious nuclear powerstation site.

It seems that the original tape came with this shooter on one side, and an adventure on the other side. You need to finish the shooter, in order to get a code and clues for the adventure part. Here are the clues and code: 

1 - three is a lucky number 

1 - dont go into something you cant get out of 
2 - base 16 beef 

1 - unblock it and you will survive 
2 - the egyptians relied on something similar 

loading code for the adventure is "u238"

http://www.lemon64.com/?mainurl=http%3A//www.lemon64.com/games/details.php%3FID%3D173
