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Report No.
 - 

Seismic insertability of control rods in pool type SFR

Takano, Kazuya ; Kato, Atsushi ; Uchita, Masato*; Murakami, Hisatomo*

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.

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