Research Papers: Codes and Standards

Evaluation of Creep-Fatigue Damage for Hot Gas Duct Structure of the NHDD Plant

[+] Author and Article Information
Hyeong-Yeon Lee1

 Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Koreahylee@kaeri.re.kr

Kee-Nam Song, Yong-Wan Kim

 Korea Atomic Energy Research Institute, 150 Dukjin-dong, Yusong-gu, Daejeon 305-353, Korea


Corresponding author.

J. Pressure Vessel Technol 132(3), 031101 (May 04, 2010) (8 pages) doi:10.1115/1.4000728 History: Received April 14, 2009; Revised November 06, 2009; Published May 04, 2010; Online May 04, 2010

Evaluation of creep-fatigue damage has been carried out for the hot gas duct (HGD) structure in the nuclear hydrogen development and demonstration (NHDD) plant. The core outlet and inlet temperature of the NHDD plant are 950°C and 490°C, respectively. Case studies on high temperature design codes of the draft code case for Alloy 617, ASME boiler and pressure vessel code section III subsection NH (ASME-NH), and RCC-MR were carried out for the inner tube of the HGD for the candidate materials of Alloy 617 and Alloy 800H. Technical issues in application of the draft code case to a high temperature structure are discussed for the Alloy 617 material. Code comparison between the ASME-NH and RCC-MR for Alloy 800H has been carried out. The candidate material of the outer pressure boundary (cross vessel) of the HGD is Mod.9Cr-1Mo steel. The damage evaluation, according to the ASME-NH and RCC-MR for the cross vessel of Mod.9Cr-1Mo steel, has been conducted and their results were compared.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

The NHDD plant: (a) reactor system and power conversion unit and (b) hot gas duct

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Figure 2

Hot gas duct piping structure: (a) hot gas duct structure and (b) section view

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Figure 3

The hot gas duct structure: (a) cross vessel and (b) inner tube

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Figure 4

Creep-fatigue damage envelope

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Figure 5

Finite element model: (a) cross vessel (1/8 model) and (b) inner tube (axisymmetic)

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Figure 6

Thermal load conditions and temperature profile

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Figure 7

Distribution of ε11 strain: (a) cross vessel (1/8 model) and (b) inner tube (axisym)

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Figure 8

Distribution of ε22 and ε33 strain

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Figure 9

Total strain and its corresponding stress

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Figure 10

Relaxation or forward creep from initial stress level of σj

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Figure 11

Average isochronous stress-stain curve of Mod.9Cr-1Mo steel in ASME-NH and the concept of isochronous curve




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