Evaluation of the Stress Distribution on the Pressure Vessel

Head and Nozzles according to Design by Analysis

of ASME code

SUMMARY

This report discusses and analyzes the structural integrity for the pressure

vessel head, nozzles, and nozzle reinforcement when appling to Design by

Analysis of ASME code. According to each operating service load, the stress

distributions on the pressure vessel head, nozzles, and nozzle reinforcement

were investigated and the factors which should be considered for the nozzle

design were analyzed. The results of this analysis lead to the better design

for the pressure vessel head, nozzles, and nozzle reinforcement. The

pressurizer and PSV nozzle of Korea Standardized Nuclear Power

Plant(Ulchin 3&4) were used as the basic model for this work.

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Table 1. Nozzle Loads for Safety Valve Nozzles 10

Table 2. Load Combination for Safety Valve Nozzles 11

Table 3. Direction of Pipe Load for Safety Valve Nozzles 12

Table 4. Allowable Design Stress Intensities 13

Table 5. Stress Results for Internal Pressure only 33

Table 6. Stress Results for Design, Level A and B Condition 33

Table 7. Stress Results for Level C Condition 34

Table 8. Stress Results for Level D Condition 34

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Figure 1. Ulchin 3, 4 Pressurizer 4

Figure 2. Basic Dimension and Material Properties of Ulchin 3, 4 PZR 5

Figure 3. PSV Nozzle of Ulchin 3, 4 PZR 6

Figure 4. Analysis Model of Ulchin 3, 4 PZR and Nozzle 7

Figure 5. Analysis Results for Intenal Pressure only 16

Figure 6. Analysis Results for Case 1 of Table 3 17

Figure 7. Analysis Results for Case 2 of Table 3 18

Figure 8. Analysis Results for Case 3 of Table 3 19

Figure 9. Analysis Results for Case 4 of Table 3 20

Figure 10. Analysis Results for Case 5 of Table 3 21

Figure 11. Analysis Results for Case 6 of Table 3 22

Figure 12. Analysis Results for Case 7 of Table 3 23

Figure 13. Analysis Results for Case 8 of Table 3 24

Figure 14. Analysis Results for Design, Level A and Level B Condition ••••25

Figure 15. Analysis Results for Level C Condition 26

Figure 16. Analysis Results for Level D Condition 27

Figure 17. Stress Change from Bottom Nozzle to Top Nozzle 28

Figure 18. Stress Change from Bottom Nozzle to Top Nozzle 29

Figure 19. Stress Change of Head from Front Part to Rear Part 30

Figure 20. Stress Change of Nozzle from Front Part to Rear Part 31

Figure 21. Element Location 32

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BIBLIOGRAPHIC INFORMATION SHEET

Performing Org.

Report No.

Sponsoring

Org, Report No.Standard Report No. INIS Subject Code

KAERI/TR-1001/98

Title / Subtitle

Evaluation of the Stress Distribution on the Pressure Vessel Head

and nozzles according to Design by Analysis of ASME codeProject Manager

(Main Author)

and Department

K.S.Kim (Mechanical Design Development)

Researcher and

DepartmentJ.K.Park

T.W.Kim, K.H.Jeong, G.M.Lee (Mechanical Design Development)

Pub. Place Taejon Publisher KAERI Pub. Date

Page 48 p. Fig. & Tab. Yes(O), No ( ) Size 26 cm.

Note

Classified Open(O),Restricted( ),

Class DocumentReport Type TR

Sponsoring Org. Contract No.

Abstract (15-20 Lines)

This report discusses and analyzes the structural integrity for the pressure

vessel head, nozzles, and nozzle reinforcement when appling to Design by

Analysis of ASME code. According to each operating service load, the

stress distributions on the pressure vessel head, nozzles, and nozzle

reinforcement were investigated and the factors which should be

considered for the nozzle design were analyzed. The results of this

analysis lead to the better design for the pressure vessel head, nozzles,

and nozzle reinforcement. The pressurizer and PSV nozzle of Korea

Standardized Nuclear Power Plant(Ulchin 3&4) were used as the basic

model for this work.Subject Keywords

(About 10 words)

pressure vessel head, nozzles, nozzle reinforcement, Design

by Analysis, ASME code, pressurizer, PSV nozzle