[en] The bottom structure of an instrumented capsule is a part which is joined at the receptacle of the flow tube in the reactor in-core. A geometrical change of the bottom structure has an effect on the pressure drop and the vibration of the capsule. The receptacle of a single channel test loop was slightly modified in March 2005, and the out-pile test to evaluate the structural integrity of the creep capsule(03S-07K) and the material capsule(04M-17U) was performed by using a single channel and a half core test loop. From the pressure drop test of the dummy fuel, we confirmed that the modified single channel test loop has an equal flow rate to the HANARO. In the case of the material capsule with the bottom structure of a solid cone shape, the optimized diameter of the bottom structure which satisfies HANARO's flow requirement(19.6 kg/s) is 71mm. The maximum peak displacement of the two capsules measured at the half core test loop is lower than 1.0mm. From the analysis results, we can confirm that the test hole will not be interfered with near the flow tubes because its displacement due to the cooling water is very small at 0.072mm. The fundamental frequency of the capsule under water is 9.64Hz. It is expected that the resonance between the capsule and the fluid flow due to the cooling water in HANARO's in-core will not occur. Also, the new bottom structure of a solid cone shape with 71mm in diameter will be applicable to the material and special capsules in the future