Which risk increases notably when isotopes accumulate in nuclear fuel?

💡 Explanation

Increased isotope buildup raises risk of neutron absorption, causing reactor instability because increasing numbers slow and absorb free neutrons via neutron capture, rather tha supporting sustained reaction; therefore neutron flux becomes harder to maintain.

• Which outcome occurs when enriched uranium isotopes experience neutron moderation?
• Which consequence results when impedance mismatch within phased array?
• Which consequence results when alpha decay occurs in americium-241?
• Which outcome reduces energy production during Helium-3 fusion?
• Which mechanism limits catalytic activity in a polymer electrolyte membrane fuel cell (PEMFC) operating at high current density?
• Which outcome occurs when the conduction band minimum lowers?