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.

.

2

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

3

BACKGROUND : SBLC SYSYTEM

4

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

5

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

6

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.

7

TANK & SUPPORT MATH MODEL

8

TANK & SUPPORT MATH MODEL

9

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

10

DESIGN & ANALYSIS OF TANK STRUCTURE

Ref.: Fundamentals of Earthquake Engineering By Nathan M. Newmark and Emilio Rosenblueth

11

DESIGN & ANALYSIS OF TANK STRUCTURE

12

DESIGN & ANALYSIS OF TANK STRUCTURE

13

DESIGN & ANALYSIS OF TANK STRUCTURE

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

14

DESIGN & ANALYSIS OF TANK STRUCTURE

RESULTS: SBLC TEST TANK

15

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

RESULTS: SBLC TEST TANK

16

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

RESULTS: SBLC TEST TANK

17

SUMMARY OF CONCLUSIONS

18

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.

19