Lookup tables of critical heat fluxes

Kirillov, P. L.; Bobkov, V. P.; Boltenko, A.; Vinogradov, V. N.; Katan, I. B.; Smogalev, I. P.

doi:10.1007/bf01137996

Cited by 7 publications

(2 citation statements)

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“…The table was constructed using 15000 experimental points and consists of a three-dimensional array of 4410 points, 15 values of the pressure in the range 0.1-20 MPa, 14 values of the mass flow in the range 0-7500 kg/(m 2 ·sec), and 21 values of the relative enthalpy of the flow --0.5-1. After interpolation the critical heat flux is multiplied by correction factors which take account of the following factors: diameter of the tube, difference of the critical heat flux for bundles of rods from the critical heat flux for tubes, the axial profile of the power release, and the change in the boundary layer at the entrance into a bundle and behind the spacing lattices.There are older versions of a simplified table for the critical heat flux that also take account of the difference in the critical heat fluxes of the first and second kinds [3][4][5]. The modified tables should be included in the computational codes.…”

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Verification of relap5/mod3.2 critical heat transfer computational method by experiments performed on the ks facility

Afremov

Yashnikov

2011

At Energy

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The computational results obtained with the RELAP5/mod3.2 code for critical heat transfer are compared with experimental data obtained on the KS facility for RBMK fuel assembly models. The confidence interval is constructed for the correction factor to the computed critical heat flux.The method used in the RELAP5/mod3.2 code to calculate critical heat transfer for the RBMK-1000 reactor is verified. The models established on the KS facility (Kurchatov Institute) and used in 1969-1974 to study a crisis under RBMK conditions are closest to natural conditions [1]. For verification, 290 experimental points obtained on five sections were used.The method of [2] is used in RELAP5/mod3.2 to calculate the critical heat flux. This method consists of interpolating the critical heat flux in a three-dimensional space: pressure, mass flow, and relative entropy of the flow. The interpolation is performed according to a table with experimental data for tubes in terms of the diameter 8 mm. The table was constructed using 15000 experimental points and consists of a three-dimensional array of 4410 points, 15 values of the pressure in the range 0.1-20 MPa, 14 values of the mass flow in the range 0-7500 kg/(m 2 ·sec), and 21 values of the relative enthalpy of the flow --0.5-1. After interpolation the critical heat flux is multiplied by correction factors which take account of the following factors: diameter of the tube, difference of the critical heat flux for bundles of rods from the critical heat flux for tubes, the axial profile of the power release, and the change in the boundary layer at the entrance into a bundle and behind the spacing lattices.There are older versions of a simplified table for the critical heat flux that also take account of the difference in the critical heat fluxes of the first and second kinds [3][4][5]. The modified tables should be included in the computational codes. Unfortunately, a simplified 1986 table is still used even in the latest modifications of the RELAP5 code. However, it should be noted that the correction factor taking account of the difference of the critical heat flux for rod bundles from the critical heat flux for tubes has a larger effect on the discrepancy between the computed and experimental values of the critical heat flux than the simplified table mentioned above.The model of a full-scale fuel assembly was used in the experiments studying critical heat emission. The pressure vessel holding the electrically directly heated model comprised a Kh18H10T steel tube with outer diameter 121 mm and wall thickness 6 mm. A collection of electrically insulating bushings consisting of the natural mineral talcochlorite was placed inside the tube. The bushings were 120-mm high and had an inner diameter of 80 mm.The model used in the experiments consisted of 19 electrically heated Kh18H10T steel fuel-element simulators with outer diameter 13.5 mm, wall thickness 3.5 mm, and length (zone of heat release) 7 m. The model was heated by passing a constant electric current from thyristor units directly a...

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confidence: 99%

“…There are older versions of a simplified table for the critical heat flux that also take account of the difference in the critical heat fluxes of the first and second kinds [3][4][5]. The modified tables should be included in the computational codes.…”

mentioning

confidence: 99%