GTSTRUDL User’s Group Annual Meeting - 2012
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Transcript of GTSTRUDL User’s Group Annual Meeting - 2012
GTSTRUDL User’s Group Annual Meeting - 2012GTSTRUDL User’s Group Annual Meeting - 2012
STANDBY LIQUID CONTROL TEST TANK
June 14, 2012Parimal Gandhi, PE
Sr. Engineer1
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.
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AGENDA : SBLC TEST TANK
1. BACKGROUND SBLC SYSTEM
2. NRC INFORMATION NOTICE 2012-01
3. TANK & SUPPORT MATH MODEL
4. DESIGN & ANALYSIS OF TANK
STRUCTURE
5. RESULTS
6. SUMMARY OF CONCLUSIONS
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BACKGROUND : SBLC SYSYTEM
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If Control Rods are not If Control Rods are not available, available,
then use Boron to absorb then use Boron to absorb neutrons neutrons
SBLC TEST TANKSBLC TEST TANK
SBLC STORAGE SBLC STORAGE TANKTANK
BACKGROUND: SBLC TEST TANK
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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.
NRC INFORMATION NOTICE 2012-01
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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.
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TANK & SUPPORT MATH MODEL
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TANK & SUPPORT MATH MODEL
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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
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DESIGN & ANALYSIS OF TANK STRUCTURE
Ref.: Fundamentals of Earthquake Engineering By Nathan M. Newmark and Emilio Rosenblueth
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DESIGN & ANALYSIS OF TANK STRUCTURE
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DESIGN & ANALYSIS OF TANK STRUCTURE
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DESIGN & ANALYSIS OF TANK STRUCTURE
For Bolted Steel Structure 5% Damping DBE Horizontal Acceleration Response Spectra
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DESIGN & ANALYSIS OF TANK STRUCTURE
RESULTS: SBLC TEST TANK
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Max. Stress = 22.895 ksi < 0.9x30 =27.0 ksi ok.
RESULTS: SBLC TEST TANK
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Max. Stress = 19.836 ksi < 0.75x30 =27.0 ksi ok.
RESULTS: SBLC TEST TANK
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SUMMARY OF CONCLUSIONS
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The supporting structure for SBLC test tank
is adequate for storage of 30” of water during a
seismic event.
Questions?Questions?
Thank you.Thank you.
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