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Hee cheon NO Nuclear System/Hydrogen Lab. KAIST

Chapter 2: Reactor Heat Generation. Hee cheon NO Nuclear System/Hydrogen Lab. KAIST. Contents. 2.1 Energy release and deposition 2.2 Fission energy generation after reactor scram 2.3 Decay heat generation A2.1 Appendix. 2.1 Energy release and deposition. Fission chain reaction:.

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Hee cheon NO Nuclear System/Hydrogen Lab. KAIST

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  1. Chapter 2: Reactor Heat Generation Hee cheon NO Nuclear System/Hydrogen Lab. KAIST

  2. Contents 2.1 Energy release and deposition 2.2 Fission energy generation after reactor scram 2.3 Decay heat generation A2.1 Appendix

  3. 2.1 Energy release and deposition • Fission chain reaction:

  4. 2.1 Energy release and deposition • Promp neutron life cycle

  5. 2.1 Energy release and deposition • Forms of energy release instanteneous release delayed release

  6. 2.1 Energy release and deposition • Fission energy release process delayed release instanteneous release

  7. 2.1 Energy release and deposition • Instanteneous energy release from fission • Delayed energy release form fission

  8. 2.1 Energy release and deposition • Deposition of • fission energy

  9. 2.2 Fission energy generation after reactor scram • Prompt fission energy release • Example

  10. 2.2 Fission energy generation after reactor scram • Delayed neutron precursors • Delayed neutron six-group constants

  11. 2.2 Fission energy generation after reactor scram • One-group approximation of six-group point kinetics equations • One group constants for U235:

  12. 2.2 Fission energy generation after reactor scram • Fission energy generation rate after reactor scram • =>

  13. 2.2 Fission energy generation after reactor scram • Solution of one-group approximation: • -0.05 reactivity withdrawl of solutions of one-group approximation with One group constants for U235: promp jump=0.13

  14. 2.2 Fission energy generation after reactor scram • +0.0015 reactivity insertion of solutions of one-group approximation with One group constants for U235: promp jump=1.25

  15. Total heat generation rate • Total heat generation rate=Heat generation rate by fission(prompt+delayed neutrons) and Decay heat geenration rate • HW#2: Chapt.2 #5+#6

  16. 2.3 Decay heat generation • Decay energy release process

  17. 2.3 Decay heat generation • Empirical Decay heat cuve of ANS-5 for U235 (Patterson-Schlitz)

  18. 2.3 Decay heat generation • Simple Decay heat cuve of ANS-5 for U235(1968) Glasstone's ANS-5.1(1971)

  19. 2.3 Decay heat generation • Long-term (beyond 100yrs): decay heat cuve

  20. 2.3 Decay heat generation • Long-term (beyond 100yrs): • decay heat cuve

  21. 2.3 Decay heat generation • Long-term (beyond 100yrs): Radioactivity

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