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GTSTRUDL User’s Group Annual Meeting - 2012 PowerPoint Presentation
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GTSTRUDL User’s Group Annual Meeting - 2012. STANDBY LIQUID CONTROL TEST TANK. June 14, 2012 Parimal Gandhi, PE Sr. Engineer. PURPOSE : SBLC TEST TANK.

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slide1

GTSTRUDL User’s Group Annual Meeting - 2012

STANDBY LIQUID CONTROL TEST TANK

June 14, 2012Parimal Gandhi, PE

Sr. Engineer

slide2

PURPOSE : SBLC TEST TANK

  • To ensure that the SBLC Test Tank is supported adequately such that it will not fail and impact the surrounding safety related valves and piping during a seismic event.
  • .
slide3

AGENDA : SBLC TEST TANK

  • BACKGROUND SBLC SYSTEM
  • NRC INFORMATION NOTICE 2012-01
  • TANK & SUPPORT MATH MODEL
  • DESIGN & ANALYSIS OF TANK STRUCTURE
  • RESULTS
  • SUMMARY OF CONCLUSIONS
slide4

BACKGROUND : SBLC SYSYTEM

SBLC TEST TANK

SBLC STORAGE TANK

If Control Rods are not available,

then use Boron to absorb neutrons

slide5

BACKGROUND: SBLC TEST TANK

  • The SBLC test tank is a stainless steel, 220 gallon tank used for performing surveillances on the SBLC system.
  • During pump operability test, demin water is added to the test tank, the SBLC storage tank is isolated from the pumps, the SBLC test tank is aligned to the pumps.
  • SBLC test tank is not safety related.
  • SBLC test tank is designed for seismic II/I criteria.
slide6

NRC INFORMATION NOTICE 2012-01

  • To inform addressees of recent operating experience related to seismic concerns principally issues involving tanks.
  • The SBLC test tank was not seismically qualified when they contained water.
  • The SBLC test tank could potentially fall over or collapse during a seismic event and impact safety-related equipment located nearby.
slide9

TANK & SUPPORT MATH MODEL

  • The SBLC test tank : modeled as an open tank consisting of SBHQ6 & SBHT6 plate bending finite elements.
  • Supporting structures : schedule 40 pipes, modeled as column elements.
  • Support Base plates: Plate bending finite elements SBHQ6 & SBHT6.
  • Concrete & Bolts : Nonlinear spring elements
slide10

DESIGN & ANALYSIS OF TANK STRUCTURE

Ref.: Fundamentals of Earthquake Engineering By

Nathan M. Newmark and Emilio Rosenblueth

slide13

DESIGN & ANALYSIS OF TANK STRUCTURE

For Bolted Steel Structure 5% Damping DBE Horizontal Acceleration Response Spectra

slide15

RESULTS: SBLC TEST TANK

  • Max. Stress = 22.895 ksi < 0.9x30 =27.0 ksi ok.
slide16

RESULTS: SBLC TEST TANK

  • Max. Stress = 19.836 ksi < 0.75x30 =27.0 ksi ok.
slide18

SUMMARY OF CONCLUSIONS

  • The supporting structure for SBLC test tank is adequate for storage of 30” of water during a seismic event.
slide19

THE END

Questions?

Thank you.