Nuclear New World

When energy is exhausted, nuclear weapons become the last straw that overwhelms civilization. Then the world was destroyed. Thousands of years later, a young man woke up from an evacuation cabin and cautiously stepped into the wasteland. He found that the civilization of the new world was completely beyond his understanding and imagination. A new energy source - nucleazine. There are only intelligent species in the book - elves and orcs. He wanted to know what was going on, but first he had to get to work.