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- 저자 : SAMIRAN SENGUPTA (검색결과 3 건)
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SAMPLING BASED UNCERTAINTY ANALYSIS OF 10 % HOTLEG BREAK LOCA IN LARGE SCALE TEST FACILITY
SAMIRAN SENGUPTA,S. K. DUBEY,R. S. RAO,S. K. GUPTA,V. K RAINA 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.6
Sampling based uncertainty analysis was carried out to quantify uncertainty in predictions of best estimate codeRELAP5/MOD3.2 for a thermal hydraulic test (10% hot leg break LOCA) performed in the Large Scale Test Facility (LSTF)as a part of an IAEA coordinated research project. The nodalisation of the test facility was qualified for both steady state andtransient level by systematically applying the procedures led by uncertainty methodology based on accuracy extrapolation(UMAE); uncertainty analysis was carried out using the Latin hypercube sampling (LHS) method to evaluate uncertainty forten input parameters. Sixteen output parameters were selected for uncertainty evaluation and uncertainty band between 5thand 95thpercentile of the output parameters were evaluated. It was observed that the uncertainty band for the primary pressure duringtwo phase blowdown is larger than that of the remaining period. Similarly, a larger uncertainty band is observed relating toaccumulator injection flow during reflood phase. Importance analysis was also carried out and standard rank regression coefficientswere computed to quantify the effect of each individual input parameter on output parameters. It was observed that the breakdischarge coefficient is the most important uncertain parameter relating to the prediction of all the primary side parametersand that the steam generator (SG) relief pressure setting is the most important parameter in predicting the SG secondary pressure.
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SAMPLING BASED UNCERTAINTY ANALYSIS OF 10 % HOT LEG BREAK LOCA IN LARGE SCALE TEST FACILITY
Sengupta, Samiran,Dubey, S.K.,Rao, R.S.,Gupta, S.K.,Raina, V.K Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.6
Sampling based uncertainty analysis was carried out to quantify uncertainty in predictions of best estimate code RELAP5/MOD3.2 for a thermal hydraulic test (10% hot leg break LOCA) performed in the Large Scale Test Facility (LSTF) as a part of an IAEA coordinated research project. The nodalisation of the test facility was qualified for both steady state and transient level by systematically applying the procedures led by uncertainty methodology based on accuracy extrapolation (UMAE); uncertainty analysis was carried out using the Latin hypercube sampling (LHS) method to evaluate uncertainty for ten input parameters. Sixteen output parameters were selected for uncertainty evaluation and uncertainty band between $5^{th}$ and $95^{th}$ percentile of the output parameters were evaluated. It was observed that the uncertainty band for the primary pressure during two phase blowdown is larger than that of the remaining period. Similarly, a larger uncertainty band is observed relating to accumulator injection flow during reflood phase. Importance analysis was also carried out and standard rank regression coefficients were computed to quantify the effect of each individual input parameter on output parameters. It was observed that the break discharge coefficient is the most important uncertain parameter relating to the prediction of all the primary side parameters and that the steam generator (SG) relief pressure setting is the most important parameter in predicting the SG secondary pressure.
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Kotak Vimal,Pathrose Anil,Sengupta Samiran,Gopalkrishnan Sugilal,Bhattacharya Sujay 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.10
The jet pump can be used in a test device of a nuclear reactor for high flow amplification as it reduces inlet flow requirement and thereby size of the process components. In the present work, a miniature jet pump was designed to meet high flow amplification greater than 3. Subsequently, experiments were carried out using a test setup for design validation and performance evaluation of the jet pump for different parameters. It was observed that a minimum pressure of 0.6 bar (g) was required for the secondary fluid inside the jet pump to ensure cavitation free performance at high amplification. Spacing between the nozzle tip and the mixing chamber entry point had significant effect on the performance of the jet pump. Variation in primary flow, temperature and area ratio also affected the performance. It was observed that at high flow amplification, the analytical solution differed significantly from experimental results due to very large velocities encountered in the miniature size jet pump
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