Codes and Standards

High Temperature Design and Damage Evaluation of MOD.9Cr-1Mo Steel Heat Exchanger

[+] Author and Article Information
Hyeong-Yeon Lee, Jong-Bum Kim

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

Hong-Yune Park

 AD-Solution Co., Ltd., 1101 Hanjin Officetel 535-5, Bongmyoung-dong Yusong-gu, Daejeon 305-301, Republic of Korea

J. Pressure Vessel Technol 134(5), 051101 (Sep 10, 2012) (10 pages) doi:10.1115/1.4005938 History: Received May 12, 2011; Revised November 16, 2011; Published September 10, 2012; Online September 10, 2012

High temperature design and evaluation of creep-fatigue damage for sodium-to-sodium heat exchanger, decay heat exchanger (DHX), in a sodium test loop have been conducted. The DHX is a shell- and tube-type heat exchanger with an outer diameter of 21.7 mm and effective length of 1.73 m. The DHX shell and tube materials were Mod.9Cr-1Mo steel. The temperatures of shell inlet and shell outlet in the DHX are 510 °C and 308 °C, respectively, while the temperatures of tube inlet and outlet are 254 °C and 475 °C, respectively. Three-dimensional finite element analysis was conducted for the DHX, and evaluation of creep-fatigue damage at several critical locations of the heat exchanger was carried out according to the elevated temperature design codes of the ASME Section III Subsection NH and RCC-MR. Evaluations on the integrity of the DHX and code comparisons were carried out for the critical locations of the DHX. The evaluation results showed that damages at the tubesheet joints of tube-to-tubesheet and tubesheet-to-shell were not so critical in the present DHX model.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

General arrangement of the sodium test loop, STELLA-1

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Figure 2

Configuration of DHX and reactor component arrangements in Korean demonstration SFR

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Figure 3

Arrangements of main reactor components

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Figure 6

Finite element model of the DHX

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Figure 7

Thermal loading conditions: (a) primary side of the DHX and (b) secondary side of the DHX

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Figure 8

Temperature conditions at primary sodium side

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Figure 9

Temperature conditions at secondary sodium side

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Figure 10

Temperature distributions at steady state of 510 °C

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Figure 11

Temperature distributions after 1 h of (a) cool-down (510 °C ⇒ 410 °C) and (b) heat-up (410 °C ⇒ 510 °C)

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Figure 4

Shape of the DHX

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Figure 5

Connecting parts in the DHX

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Figure 12

Stress intensity under primary loads

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Figure 13

Stress intensity at the end of heat-up under secondary loads

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Figure 14

Stress intensity near the N4A nozzle and top tubesheet at the end of heat-up: (a) N4A nozzle and (b) top tubesheet

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Figure 15

Five significant locations in design code checking

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Figure 16

Creep-fatigue damage envelope for Mod.9Cr-1Mo steel



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