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Technical Briefs

The Development of Impact Analysis Methodology for CEDM Missile of APR1400

[+] Author and Article Information
Tae Kyo Kang1

NSSS Engineering & Development Division,  Korea Power Engineering Company, Inc. (KOPEC), 150 Deokjin-dong, Yuseong-gu, Daejon 305-353, Koreaskylove@kopec.co.kr

Jin Seok Park, Hyun Min Kim, In Yong Kim

NSSS Engineering & Development Division,  Korea Power Engineering Company, Inc. (KOPEC), 150 Deokjin-dong, Yuseong-gu, Daejon 305-353, Korea

1

Corresponding author.

J. Eng. Gas Turbines Power 132(7), 074505 (Apr 26, 2010) (6 pages) doi:10.1115/1.4000368 History: Received July 23, 2009; Revised August 27, 2009; Published April 26, 2010; Online April 26, 2010

An integrated head assembly (IHA) is equipped with the missile shield to absorb the missile energy from postulated control element drive mechanism (CEDM) missile during the dynamic event of accidental conditions. Once a CEDM nozzle breaks, reactor coolant jet discharges from the broken nozzle, then it impinges at the bottom of the CEDM, and gives a thrust force to the CEDM missile until it impacts on the missile shield. After the missile impacting on missile shield, it is necessary to evaluate the structural responses on the local area of the missile shield, as well as behaviors of overall IHA structure. The jet has been previously assumed to be a single-phase flow. However, in order to reduce excessive conservatism for the jet characteristic, the jet is assumed to be a two-phase critical flow, and accordingly Fauske slip equilibrium model is applied to estimate the jet velocity. In this paper, jet impingement models are proposed to estimate the missile velocity depending on jet expansions and size of objects. With the calculated missile velocities using the jet impingement models, the nonlinear CEDM missile impact analysis is performed to investigate structural responses of the missile shield of advanced power reactor 1400. Finally, the results show that the structural integrity of the missile shield and the IHA can be maintained due to CEDM missile impact.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Missiles
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References

Figures

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Figure 7

Reaction loads of the three main columns for (a) Case 1 and (b) Case 2

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Figure 6

Stress and strain distribution of the missile shield for (a) Case 1 stress, (b) Case 2 stress, (c) Case 1 strain, and (d) Case 2 strain

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Figure 5

Displaced shape at impact area of missile shield

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Figure 4

Stress-strain curves of missile shield used for analysis

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Figure 3

Finite element model for the CEDM missile impact analysis

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Figure 2

Flow impingement models for (a) uniform constant jet impingement, (b) expanding jet impingement on an object, and (c) expanding jet impingement on a large object

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Figure 1

Integrated head assembly with missile shield

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