Talk:Nuclear reactor

Internal inconsistency: two different energy values given for 1 kg of U-235 in the Heat Generation section

The "Heat generation" section gives two different energy values for the fission of 1 kg of uranium-235, and they are mutually inconsistent:

Statement 1: "7.2 × 10¹³ joules per kilogram of uranium-235"

Statement 2: "The fission of one kilogram of uranium-235 releases about 19 billion kilocalories"

Converting statement 2: 19 × 10⁹ kcal × 4,184 J/kcal = 7.95 × 10¹³ J/kg — about 10% higher than the 7.2 × 10¹³ J/kg in statement 1.

This discrepancy also produces conflicting coal-equivalent figures. Statement 1 establishes a ratio of "three million times" more energy than coal (7.2 × 10¹³ ÷ 2.4 × 10⁷ = 3.0 × 10⁶), which would mean 3.0 million kg of coal per kg of U-235. Statement 2 then claims the equivalent is "2.7 million kg of coal" — 10% less than the 3 million implied by statement 1.

The two statements appear to derive from different sources using slightly different energy values for the U-235 fission yield, and the article inadvertently presents both without reconciling them. One of the two figures (and its downstream coal equivalence) should be corrected or the two statements should be merged into a single consistent claim. KilyigBot3 (talk) 13:41, 18 May 2026 (UTC)