ML18136A549

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Enclosure 2 - New and Replacement Pages and Drawings for the TN-68 UFSAR, Revision 9 (Public Version)
ML18136A549
Person / Time
Site: 07201027
Issue date: 05/31/2018
From:
Orano USA, TN Americas LLC
To:
Office of Nuclear Material Safety and Safeguards
References
E-51162
Download: ML18136A549 (20)
v • d • e


Text

{{#Wiki_filter:Enclosure 2 to E-51162 New and Replacement Pages and Drawings for the TN-68 UFSAR, Revision 9 (Public Version)

orano PUBLIC TN-68 DRY STORAGE CASK UPDATED FINAL SAFETY ANALYSIS REPORT TN Americas LLC 7135 Minstrel Way, Suite 300 Columbia, Maryland 21045 Rev. 9 5/18 I

The proprietary version of this FSAR provides a disclaimer on this page which explains that the document contains confidential information and that dissemination and distribution is limited. That disclaimer is not applicable to this public version of the FSAR. Rev. 9 5/18 I

FSAR Date Revision 2 5/19/2004 3 5/12/2006 4 5/12/2008 5 5/12/2010 6 5/14/2012 7 5/14/2014 8 5/12/2016 9 5/14/2018 REVISION LOG SHEET Record of Changes/FCNs FCN-01-001 FCN-02-023 FCN-02-074 FCN 721027-011 FCN 721027-012 FCN 721027-015 FCN 721027-018 FCN 721027-019 FCN 721027-020 FCN 721027-021 FCN 721027-025 FCN 721027-029 FCN 721027-031 FCN 721027-033 FCN 721027-035 FCN 721027-030 FCN 721027-036 FCN 721027-037 FCN 721027-039 FCN 721027-040 FCN 721027-048 FCN 721027-056 FCN 721027-061 FCN 721027-062 FCN 721027-060 FCN 721027-068 FCN 721027-073 Revision Log Sheet Page 1 of 1 Changed Pages Dwg 972-70-2 Rev-10 Page 3.1-4 Table 3.3-6 Dwg 972-70-1 Rev-7 Dwg 972-70-2 Rev-11 Dwg 972-70-3 Rev-8 Dwg 972-70-4 Rev-7 Dwg 972-70-5 Rev-5 Dwg 972-70-6 Rev-4 Pages 1.1-1, 4.6-1, 8.2-2 Table 8.2-1 (Continued) See list of changed pages Pages 4.8-1, 4.8-la, 4.13-2 Page 1.4-1 Table 8.1-1 (Continued) See List of Effective Pages See List of Effective Pages See List of Effective Pages Rev. 9 5/18 I

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8 I 7 H G F E D C B A 8 T 7 I 6 I 5 j 4 I 3 I Security Related Information for Drawing 972-70-2, Rev. 14 Withheld per the Criteria of RIS 2005-31 I 6 I 5 1 4 I 3 I 2 I H G F E D C B A 2 I

composites are much higher than the above requirement for the entire range of 20°C to 400°C (see Table 9.4-1). The minimum required thermal conductivities of the paired aluminum and poison plates will be verified via testing as described in Chapter 9. To minimize the thermal resistance of the basket during the fire period, the conductivity of the poison plate is considered to be equal to the aluminum conductivity. The conductivity of the poison plate is set back to the value of 165 W/m-K (7.94 Btu/hr-in-°F) or 150 W/m-K (7.22 Btu/hr-in-°F) during the cool down period to maximize the thermal resistance. Specific heat and density of poison plate is set equal to those of aluminum for transient runs. The thermal analysis of the cask with poison plate conductivity of 165 W/m-K (7.94 Btu/hr-in-0F) is addressed in Sections 4.3 to 4. 7 and the thermal analysis of the cask with poison plate conductivity of 150 W/m-K (7.22 Btu/hr-in-°F) is addressed in Section 4B.

13. Concrete and Soil (Storage Pad)

The thermal conductivity of normal, saturated concrete varies from 1.2 to 2.0 Btu/ft-hr-°F at. temperature ranging from 50 to 150°F [7]. The conductivity of concrete decreases rapidly with the rise in temperature and assumes, at 750°C (1382°F) a conductivity value equal approximately to 50 percent of that for normal temperature [7]. For the thermal analyses a thermal conductivity of 1.15 Btu/hr-ft-°F (0.0958 Btu/hr-in-°F) is considered for concrete at 70°F. This conductivity is reduced by half to a value of 0.0479 Btu/hr-in-°F at 1382°F. A thermal conductivity of0.3 W/m-K (0.0144 Btu/hr-in-°F) is co,nsidered for soil [8]. Since the concrete pad is not present for the transient runs such as the. fire accident and the vacuum drying cases, the density and specific heat of concrete and soil are irrelevant for thermal analysis.

14. Emissivities and Absorptivities The outer surface of the cask is painted white except for the bottom of the cask which is painted with either white or gray paint. Reference [9] gives an emissivity between 0.92 to 0.96 for white and gray paint and a solar absorptivity between 0.09 and 0.23 for white paints. To account for dust and dirt and to bound the problem, the thermal analysis uses a solar absorptivity of 0.3 and an emissivity of 0.9 for the white painted surfaces. The bottom of the cask is not directly affected by the solar radiation heat flux; therefore, the difference in colors between casks at the bottom surface does not affect the bounding solar absorptivity coefficient of 0.3 used in the thermal analysis.

The emissivity of the cask outer surface is set to 0.8 as required in [11] during the fire burning time. It is assumed that the cask surface is covered with soot after the fire. The solar absorptivity of soot is 0.95 [9]. To bound the problem, the thermal analysis uses a solar absorptivity of 1.0 and an emissivity of 0.9 for cask surfaces during the cool down period. 4.2-6 Rev. 9 05/18 I

Emissivity of concrete is reportedly 0.9 to 0.94 [8 & 9]. An emissivity of 0.90 is considered for concrete surfaces. The absorptivity of the concrete surface is 0.73 - 0.91 at 300K [11]. For conservatism a solar absorptivity of 1.0 is considered for concrete surface. These values are used only for the concrete pad during normal/off-normal storage conditions. 4.2-6a Rev. 9 05/18 I

active fuel region. Section 4.8 describes the methodology and lists the peaking factors used in the model. The heat generating rate for each segment of the active fuel region is calculated as follows:

    • (*xPF) q =

0.966

where, q = Decay heat load per assembly (0.441 kW= 1505.4 Btu/hr) a= Width of the modeled fuel assembly= 6.0" La =Active fuel length= 144" PF= Peaking Factor from Section 4.9 The area beneath the measured peaking factor curve is 0.996 (see Section 4.9). The heat generating value is divided by this factor to avoid degradation of the total decay heat in the model.

The ambient temperature as a function of time during a peak summer-month day is shown below for a typical site (Reference [2]) with a maximum ambient temperature of l 15°F: Time 12am 2am 4am 6am 8am 10am Temperature, °F 82 78 75 74 85 97 Time 12pm 2pm 4pm 6pm 8pm 10pm Temperature, °F 103 111 115 113 100 89 The average temperature over a 24-hour period is 94°F. For conservatism, a maximum daily averaged ambient temperature of 100°F is used for the maximum ambient temperature condition. An ambient temperature of -20°F is considered for the minimum ambient temperature conditions. The free convection and radiation heat transfer to ambient are combined together in form of a total heat transfer coefficient, which is defined as a temperature dependent material property in the model. The total heat transfer coefficients are used to apply the boundary conditions on the outer surface of the cask. Section 4.10 describes the correlations to calculate the total heat transfer coefficients applied on the outer surface of the cask. Solar radiation is considered as a constant heat flux applied on the SURF152 elements overlaid on the outer surface of the transfer cask. The outer surfaces of the cask are painted white except for the bottom of the cask which is painted with either white or gray paint. The bottom surface of the cask does not receive any solar radiation; therefore, the bottom surface is not directly affected by the solar radiation constant heat flux. The insolance values from 10CFR71 [14] are considered as the amount of solar radiation that is available for absorption at any surface. These values are multiplied by the absorptivity factor of each surface to calculate the amount of solar heat flux that each surface absorbs. The resultant value is applied as a constant heat :flux to the corresponding SURF152 elements. The heat flux values applied in the model are listed below. 4.3-3 Rev. 9 5/18 I}}

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