1 / 44

GTSTRUDL User’s Group

GTSTRUDL User’s Group. Annual Meeting - 2011. Dynamic Analysis of Service Water Pump for Seismic Restraint. June 24, 2011 Parimal Gandhi, PE Sr. Engineer. PURPOSE. Dynamic Analysis of Service Water Pump to Evaluate Seismic Loads on the Restraint . AND

sofia
Download Presentation

GTSTRUDL User’s Group

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GTSTRUDL User’s Group Annual Meeting - 2011 Dynamic Analysis of Service Water Pump for Seismic Restraint June 24, 2011Parimal Gandhi, PE Sr. Engineer

  2. PURPOSE • Dynamic Analysis of Service Water Pump to Evaluate Seismic Loads on the Restraint. • AND • NRC Reg. Guide 1.92 & NRC Gupta Method for Missing Mass Impact on Seismic Loads.

  3. AGENDA • Background of Plant Service Water System, Pump, and Seismic Restraint. • Failure of Seismic Restraint. • Dynamic Analysis of SW Pump With and Without Seismic Restraint. • Impact of NRC Reg.Guide 1.92, Rev. 2 on SW Pump Dynamic Analysis. • Conclusion.

  4. BACKGROUND PLANT SERVICE WATER SYSTEM The Service Water Pond covers approximately 94 surface acres, and is required to provide adequate cooling for 30 days following an accident.

  5. BACKGROUND PLANT SERVICE WATER SYSYEM • The Plant Service Water System is designed to: • Withstand the design basis earthquake (DBE) without impairing its function. • Have sufficient capacity and redundancy to provide reliable cooling. • Be operable during loss-of-offsite power

  6. BACKGROUND SW PUMP The SW pumps' capable to withstand a design basis earthquake (DBE) without a loss of function. If the seismic restraints are degraded to the point that their design function can-not be met, then the associated SW pumps may not be able to withstand a DBE.

  7. BACKGROUND SW PUMP PUMP MOTOR DISCHARGE HEAD ASSEMBLY PUMP BASE PLATE COLUMN ASSEMBLY SEISMIC RESTRAINT BOWL ASSEMBLY

  8. BACKGROUND SEISMIC RESTRAINT

  9. FAILURE SEISMIC RESTRAINT

  10. FAILURE SEISMIC RESTRAINT • CORROSION • MAINTANCE LOAD (VERTICAL) • ZERO GAP FOR LATERAL RESTRAINT

  11. EXAMPLE: STRUDL Math Model For Pump With Seismic Restraint 20- FLOOR PUMP BASEPLATE 17- UPPER SEISMIC RESTRAINT 12 - LOWER SEISMIC RESTRAINT

  12. DYNAMIC ANALYSIS

  13. DYNAMIC ANALYSIS

  14. EIGENPROBLEM SOLUTION

  15. DYNAMIC MASS PARTICIPATION FACTORS

  16. RESPONSE SPECTRA CURVE EAST-WEST

  17. STORING RESPONSE SPECTRA EAST-WEST

  18. RESPONSE SPECTRA CURVE VERTICAL

  19. STORING RESPONSE SPECTRA VERTICAL

  20. RESPONSE SPECTRA CURVE NORTH-SOUTH

  21. STORING RESPONSE SPECTRA NORTH-SOUTH

  22. RESPOSNSE SPECTRUM LOADING

  23. Reg.Guide Rev.1: TOTAL = [(LOAD1-Z) 2 + (LOAD2-X) 2 +(LOAD3-Y) 2 ]1/2 NRC REG. GUIDE 1.92 Rev.1 LOADING

  24. SUPPORT REACTIONS & DISPLACEMENT WITH SEISMIC RESTRAINT Reg.Guide Rev.1: TOTAL = [(LOAD1-Z) 2 + (LOAD2-X) 2 +(LOAD3-Y) 2 ]1/2 UNITS: FORCE  LBS, MOMENT IN-LBS UNITS: DISPACEMENT  INCH, ROTATION  RAD

  25. STRUDL MATH MODEL FOR PUMP WITHOUT SEISMIC RESTRAINT 20- FLOOR PUMP BASEPLATE

  26. SUPPORT REACTIONS & DISPLACEMENT WITHOUT SEISMIC RESTRAINT Reg.Guide Rev.1: TOTAL = [(‘LOAD1-Z’) 2 + (‘LOAD2-X’) 2 +(‘LOAD3-Y’) 2 ]1/2 UNITS: FORCE  LBS, MOMENT IN-LBS UNITS: DISPACEMENT  INCH, ROTATION  RAD

  27. PUMP STRESSES & DISPLACEMENT `

  28. NRC Reg Guide 1.92, Rev 1 • Missing Mass Positions All modes are assumed to be out-of-phase with the ground acceleration and out-of-phase with each other All modes having frequencies ≤ “significant” frequency If frequencies are not closely spaced: SRSS Mode Combination Method

  29. Mid Frequency Transition from Out-of-Phase to In-Phase Response Low Frequency Out-of-Phase Response High Frequency In-Phase Rigid Static Response Frequency • NRC GUPTA METHOD • Missing Mass Positions • NRC Reg Guide 1.92, Rev 2 F1 = frequency at which peak spectral acceleration is observed F2 = frequency above which the SDOF (modal) oscillators are in-phase with the transient acceleration input used to generate the spectrum and in phase with each other FZPA = frequency at which the spectral acceleration returns to the zero period acceleration; maximum base acceleration of transient acceleration input used to generate the spectrum

  30. NRC GUPTA METHOD • Missing Mass Positions • NRC Reg Guide 1.92, Rev 2 • For each mode i, in each ground motion direction k, the response is separated into a periodic part and a rigid part: • The periodic modal response portions are combined using a double sum rule:

  31. NRC GUPTA METHOD • Missing Mass Positions • NRC Reg Guide 1.92, Rev 2 • The rigid modal responses are combined algebraically, • including the residual rigid contribution from the missing mass: • The total response in each ground motion direction is computed from the SRSS of the modal combinations of the periodic and rigid responses:

  32. Missing Mass • NRC Reg Guide 1.92, Rev 2 NRC Reg.Guide Rev.2: TOTAL+MM = [(‘LOAD1-Z’+’Z-MAS’) 2 + (‘LOAD2-X’+’X-MAS’) 2 +(‘LOAD3-Y’+ ‘Y-MASS’) 2 ]1/2

  33. NRC Gupta Method • Reg Guide 1.92, Rev 2

  34. NRC Gupta Method • Reg Guide 1.92, Rev 2

  35. NRC Gupta Method • Reg Guide 1.92, Rev 2

  36. NRC Gupta Method • Reg Guide 1.92, Rev 2 ‘GUP-ZT’= [(‘ZR’+’ZPMM’) 2 + (‘Z-PERDC’) 2]1/2 ‘GUP-XT’= [(‘XR’+’XPMM’) 2 + (‘Z-PERDC’) 2]1/2 ‘GUP-YT’= [(‘YR’+’YPMM’) 2 + (‘Z-PERDC’) 2]1/2 ‘GUP-TOTL’= [(‘GUP-ZT’) 2 + [(‘GUP-XT’) 2 + (‘GUP-YT’) 2]1/2

  37. Missing Mass Positions • NRC Reg Guide 1.92, Rev 1 & 2 • NRC Gupta Method Reg.Guide Rev.1: TOTAL = [(‘LOAD1-Z’) 2 + (‘LOAD2-X’) 2 +(‘LOAD3-Y’) 2 ]1/2 NRC Reg.Guide Rev.2: TOTAL+MM = [(‘LOAD1-Z’+ ‘Z-MAS’) 2 + (‘LOAD2-X’+ ‘X-MAS’) 2 +(‘LOAD3-Y’+’Y-MASS’) 2 ]1/2 ‘GUP-TOTL’= [(‘GUP-ZT’) 2 + [(‘GUP-XT’) 2 + (‘GUP-YT’) 2]1/2

  38. NRC Reg Guide 1.92, Rev 1, 2 & Gupta Method • Missing Mass Positions FREQUENCY SPECIFICATONS O TO 900 NUMBER OF MODES 50 Acceleration Frequency

  39. NRC Reg Guide 1.92, Rev 1 & 2 • Missing Mass Positions

  40. DYNAMIC MASS PARTICIPATION FACTORS

  41. Missing Mass Positions • NRC Reg Guide 1.92, Rev 1 & 2 • NRC Gupta Method Reg.Guide Rev.1: TOTAL = [(‘LOAD1-Z’) 2 + (‘LOAD2-X’) 2 +(‘LOAD3-Y’) 2 ]1/2 NRC Reg.Guide Rev.2: TOTAL+MM = [‘(LOAD1-Z’+ ‘Z-MAS’) 2 + (‘LOAD2-X’+ ‘X-MAS’) 2 +(‘LOAD3-Y’+ ‘Y-MASS’) 2 ]1/2 ‘GUP-TOTL’= [(‘GUP-ZT’) 2 + [(‘GUP-XT’) 2 + (‘GUP-YT’) 2]1/2

  42. Missing Mass Positions • NRC Reg Guide 1.92, Rev 1 , 2 & NRC GUPTA Method Reg. Guide 1.92, Rev. 1: X LOAD 2 Reg.Guide Rev.2: TOTAL-X = [(X LOAD2) 2 + (MM LOAD2) 2]1/2 NRC Gupta Method: GUP XT = [(X RIGID+MM-XPERD) 2 + ( X PERDC) 2]1/2

  43. CONCLUSION • Seismic Restraint : To Reduce Pump Deflection and Stresses • No Impact of NRC Reg.Guide 1.92, Rev. 2 on Pump Dynamic Analysis

  44. THE END Questions? Thank you.

More Related