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A study on the change in dynamic characteristics of reactor internals

Technical Report:

Abstract

An experimental and analytical studies were performed to establish the relationship between in-air dynamic characteristics of reactor internals and in-water ones by using a scaled-down model which consists of CSB (flexible) and RPV (rigid) models. The experimental results show that the natural frequencies of the CSB model in water are remarkably lowered than those in air, and the normalized natural frequency (in-water frequency/in-air frequency) of the CSB model exists between in-phase mode and out-of-phase mode values of the flexible-to-flexible co-axial cylindrical structure which has the same dimensions as the scaled-down model. The normalized frequency increases to asymptotically reach the in-phase mode frequency of the flexible co-axial cylindrical structure as circumferential mode number (n) increases, while decreases to come near of the out-of-phase mode value as the circumferential mode number decreases. The support condition change for the CSB model in waster made the frequency of 1st axial mode (pure beam mode) shifted into lower value without any effect on the other modes. The changing trend of the natural frequencies and the mode shapes resulted from the finite element analysis by using the ANSYS code shows good agreement with the experimental results both in air and in water cases. In addition, a  More>>
Authors:
Kim, Tae Ryong; Jung, Seung Ho; Park, Jin Ho; Park, Jin Suk; Jeong, Keong Hoon [1] 
  1. Korea Atomic Energy Res. Inst., Taejon (Korea, Republic of)
Publication Date:
Dec 01, 1993
Product Type:
Technical Report
Report Number:
KAERI/RR-1267/93
Reference Number:
SCA: 220200; 420500; PA: AIX-26:011140; EDB-95:028373; SN: 95001324049
Resource Relation:
Other Information: PBD: Dec 1993
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 42 ENGINEERING; REACTOR COMPONENTS; MECHANICAL VIBRATIONS; FINITE ELEMENT METHOD; OSCILLATION MODES; REACTOR VESSELS; TUBES; 220200; 420500; COMPONENTS AND ACCESSORIES; MATERIALS TESTING
OSTI ID:
10111503
Research Organizations:
Korea Cancer Center Hospital, Seoul (Korea, Republic of)
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Other: ON: DE95612797; TRN: KR9400123011140
Availability:
OSTI; NTIS; INIS
Submitting Site:
KRN
Size:
142 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Kim, Tae Ryong, Jung, Seung Ho, Park, Jin Ho, Park, Jin Suk, and Jeong, Keong Hoon. A study on the change in dynamic characteristics of reactor internals. Korea, Republic of: N. p., 1993. Web.
Kim, Tae Ryong, Jung, Seung Ho, Park, Jin Ho, Park, Jin Suk, & Jeong, Keong Hoon. A study on the change in dynamic characteristics of reactor internals. Korea, Republic of.
Kim, Tae Ryong, Jung, Seung Ho, Park, Jin Ho, Park, Jin Suk, and Jeong, Keong Hoon. 1993. "A study on the change in dynamic characteristics of reactor internals." Korea, Republic of.
@misc{etde_10111503,
title = {A study on the change in dynamic characteristics of reactor internals}
author = {Kim, Tae Ryong, Jung, Seung Ho, Park, Jin Ho, Park, Jin Suk, and Jeong, Keong Hoon}
abstractNote = {An experimental and analytical studies were performed to establish the relationship between in-air dynamic characteristics of reactor internals and in-water ones by using a scaled-down model which consists of CSB (flexible) and RPV (rigid) models. The experimental results show that the natural frequencies of the CSB model in water are remarkably lowered than those in air, and the normalized natural frequency (in-water frequency/in-air frequency) of the CSB model exists between in-phase mode and out-of-phase mode values of the flexible-to-flexible co-axial cylindrical structure which has the same dimensions as the scaled-down model. The normalized frequency increases to asymptotically reach the in-phase mode frequency of the flexible co-axial cylindrical structure as circumferential mode number (n) increases, while decreases to come near of the out-of-phase mode value as the circumferential mode number decreases. The support condition change for the CSB model in waster made the frequency of 1st axial mode (pure beam mode) shifted into lower value without any effect on the other modes. The changing trend of the natural frequencies and the mode shapes resulted from the finite element analysis by using the ANSYS code shows good agreement with the experimental results both in air and in water cases. In addition, a theoretical study was also performed by simplifying the scaled-down model as flexible-to-rigid co-axial cylindrical structure. It is found that the in-air natural frequencies shows good agreement with both the experimental and finite element analysis results, while the in-water frequencies reveals rather discrepancies. (Author).}
place = {Korea, Republic of}
year = {1993}
month = {Dec}
}