Research Papers

Calculation of Evaporation From Fukushima Nuclear Power Plant Spent Fuel Pools

[+] Author and Article Information
Mirza M. Shah

Engineering Research Associates,
10 Dahlia Lane,
Redding, CT 06896
e-mail: mshah.erc@gmail.com

Manuscript received December 2, 2018; final manuscript received May 6, 2019; published online August 2, 2019. Assoc. Editor: Masaya Ohtsuka.

ASME J of Nuclear Rad Sci 5(4), 041602 (Aug 02, 2019) (6 pages) Paper No: NERS-18-1126; doi: 10.1115/1.4043847 History: Received December 02, 2018; Revised May 06, 2019

Prediction of evaporation rates from spent fuel pools of nuclear power plants in normal and postaccident conditions is of great importance for the design of safety systems. A severe accident in 2011 Fukushima nuclear power plant caused failure of cooling systems of its spent fuel pools. The postaccident evaporation from the spent fuel pools of Fukushima units 2 and 4 is compared to a model based on analogy between heat and mass transfer which has been validated with a wide range of data from many water pools including a spent fuel pool. Calculations are done with two published estimates of fuel decay heat, one 25% lower than the other. The model predictions are close to the evaporation using the lower estimate of decay heat. Other relevant test data are also analyzed and found in good agreement with the model.

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Fig. 1

Comparison of measured evaporation from Columbia fuel pool by inventory tracking method with the Shah model [8]. Data from Hugo [9].

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Fig. 2

Measured increase in evaporation from Columbia NPP fuel pool as water temperature rose above 36.7 °C compared to the Shah model [8]. Data from Hugo [9].

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Fig. 3

Comparison of the data of Boelter et al. [17] with the Shah model [8]. Air temperature 18.7–26.3 °C, relative humidity 59%–58%.

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Fig. 4

Comparison of evaporation from Fukishima unit 2 based on decay heat according to Wang et al. [1] and Yanagi et al. [3] with the Shah model [8]. Pool area 121 m2.

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Fig. 5

Comparison of evaporation from fuel pool of Fukishima unit 4 according to Wang et al. [1] and Yanagi et al. [3] with the Shah model [8] predictions for natural convection and for air velocity of 1.1 m/s. Pool area 121 m2.



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