[3I01-06] Sodium-cooled Fast Reactor-related Evaluation and Technology Development

[3I02] Seismic Insertability of Control Rods in Pool type SFR

*Kazuya Takano¹, Atsushi Kato¹, Masato Uchita², Hisatomo Murakami³ (1. JAEA, 2. JAPC, 3. MFBR)

Keywords:Sodium-cooled fast reactor, Pool-type reactor, Control rods insertability

Control rods of pool-type SFR are not fixed radially in the control rod guide tubes. Relative offset between control rods and around in-vessel structures occurs in an earthquake situation. The relative offset could lead three-point restraint of the control rods and difficulty of their insertion. In the present study, the seismic offset was quantitively evaluated and was compared with the criteria of the three-point restraint in the current design of pool-type SFR with 600 MWe. As the evaluated offset is below the criteria, the three-point restraint in an earthquake can be prevented in the current design of pool-type SFR. In addition, several measures were examined to increase the margin of control rods insertability.