Evaluation of flow-induced vibration of thermometer well for JOYO

Isozaki, Kazunori;

PNC TN9410 97-062, 169 Pages, 1997/05

PNC-TN9410-97-062.pdf:5.21MB

Sodium leak accident of MONJU was caused high cycles fatigue damage of thermometer well by flow-induced vibration. It was due to the sy㎜etric vortex shedding which was occurred rear flow of thermometer well. So, Thermometer wells installed in primary and secondary heat transport systems of JOYO were evaluated of flow-induced vibration. Evaluation of flow-induced vibration of thermometer well was done checking of flow-induced vibration base on authorized design report for JOYO, evaluation of summary flow-induced vibration by natural frequency of thermometer well in sodium as cantilever models, and evaluation based on small velocity rule of ASME Code Section III Appendix N-1300. By this result, thermometer wells (12B piping of secondary cooling system) were not sattisfied requirement to avoid flow-induced vibration by small velocity rule. Therfore, Detailed vibration characteristic analysis, water flow-induced vibration test, dumping test and evaluation of structural integrity were carried out. These results, vibration amplitude of well on the tip was 0.13mm (vibration non-dimensional amplitude of 0.015) and peak stress of 2.9kg/mm is occurred. Thermometer wells (12B piping of secondary cooling system) which occurred peak stress by flow vibration was confirmed enough to satisfy 5.3kg/mm2 of design fatigue limit.

Piezoelectric paints: Preparation and application as built-in vibration sensors of structural materials

Egusa, Shigenori; *

J. Mater. Sci., 28, p.1667 - 1672, 1993/00

https://doi.org/10.1007/BF00363366

no abstracts in English

Study of Simplification of Model on Vibration Analysis of Vertical Two-Dimensonal VHTR Core

JAERI-M 9447, 57 Pages, 1981/04

JAERI-M-9447.pdf:1.34MB

no abstracts in English

Development of microearthquake response detection by optical fiber seismic vibrometer with a water tank and a specially designed robotic system

Nishimura, Akihiko; Morishita, Hideki*; Yamada, Tomonori; Yoshida, Minoru*; Tagawa, Akihiro

no journal, , 

For decommissioning of the Fukushima Daiichi Nuclear Power Station, installation of an optical fiber seismic vibrometer using a specially designed robotic system was demonstrated. A water tank with 4.5m diameter and5m depth was used as a demo plant of tank type critical assembly. Micro earthquake response of a water tank was detected by the optical fiber seismic vibrometer. Vibration characteristic of the window of the water tank was monitored by laser Doppler interferometer.