ML18345A237
| ML18345A237 | |
| Person / Time | |
|---|---|
| Site: | 07103052 |
| Issue date: | 10/17/2018 |
| From: | Orano USA, TN Americas LLC |
| To: | Office of Nuclear Material Safety and Safeguards |
| References | |
| E-52876 | |
| Download: ML18345A237 (4) | |
Text
Enclosure 2 to E-52876 Chapter 4A Page 10/30 and Chapter 4A-11 Pages 4/48 and 12/48
TN International DOS-18-011415-031-NPV Rev. 1.0 Page 10 / 30 NON PROPRIETARY VERSION at the top for the RHF content is much less than 1 mSv/h so that it is confirmed that the regulatory contact shielding criterion (2 mSv/h) is respected.
6.2 Irradiated MTR plate fuel element contents (UAlx-Al, U3O8-Al, UySiz-Al, UMo-Al)
Equivalent dose rates around the TN-MTR packaging loaded with the MTR-68, MTR-52, MTR-52S, MTR-52SV2 or MTR-44 basket and one of the 3 upper-bound contents defined above are evaluated by calculation in Appendix 4A-11.
Maximum equivalent dose rates (1780 mSv/h in contact with the package and 0.094 mSv/h at 2 metres from the vertical walls of the vehicle) are obtained for the MTR-68 basket at the shell under the base of the trunnion and in the uninterrupted of the shell respectively, under routine transport conditions.
This package satisfies regulatory transport requirements under exclusive use.
For accident transport conditions:
the maximum equivalent dose rate is obtained at 1 metre from the package near the top part of the shell under the trunnion and is equal to 8.517 mSv/h,
the maximum equivalent dose rate at 1 m from the bottom of the packaging (axial at the bottom and radial near the bottom) is equal to 0.906 mSv/h.
6.3 Irradiated UO2 fuel element contents Equivalent dose rates around the TN-MTR packaging loaded with the MTR-44 basket and the UO2 elements upper-bound content defined above are evaluated by calculation in Appendix 4A-11.
Maximum equivalent dose rates (0.679 mSv/h in contact with the package and 0.023 mSv/h at 2 metres from the vertical walls of the vehicle) are obtained at the bottom of the packaging and in the uninterrupted section and bottom part of the shell respectively, under routine transport conditions.
This package satisfies regulatory transport requirements under exclusive use.
For accident transport conditions
the maximum equivalent dose rate is obtained at 1 metre from the package near the top part of the shell under the trunnion and is equal to 0.324 mSv/h,
the maximum equivalent dose rate at 1 m from the bottom of the packaging (axial at the bottom and radial near the bottom) is equal to 0.213 mSv/h.
6.4 Beryllium element contents Equivalent dose rates around the TN-MTR packaging loaded with the MTR-44 basket and the "beryllium elements" content are estimated from the results obtained on the ICO 4000 type irradiator (see Appendix 4A-8).
This package satisfies regulatory requirements when its characteristics comply with the characteristics presented in Chapter 0A-5. to E-52876 Pages from Chapter 4A and 4A-11 NP Page 1 of 3 This value should be 1.780 mSv/h.
See pages 2 and 3 of this enclosure for confirmation.
Chapter 4A-DOS-18-011415-031-NPV-1.0
TN International Réf. : DOS-18-011415-032-NPV Rév. 0 Page 4/48 NON PROPRIETARY VERSION The maximum values of the calculated equivalent dose rates (EDR) are summarized in the following tables:
MTR-68 Basket EDR (mSv/h)
Criterion (mSv/h)
Content 1 Content 2 Content 3 RTC - Package surface 1.639 1.780 0.455 2
RTC-2 meters from vehicle 0.094 0.094 0.022 0.1 ATC - 1 meter from package 7.843 8.517 1.980 10 MTR-52, MTR-52S, MTR-52SV2 baskets EDR (mSv/h)
Criterion (mSv/h)
Content 1 Content 2 Content 3 RTC - Package surface 1.193 0.953 0.221 2
RTC-2 meters from vehicle 0.065 0.063 0.013 0.1 ATC - 1 meter from package 7.843 8.517 1.980 10 MTR-44 baskets EDR (mSv/h)
Criterion (mSv/h)
Content 1 Content 2 Content 3 Content 4 RTC - Package surface 1.342 1.391 0.263 0.679 2
RTC-2 meters from vehicle 0.045 0.035 0.008 0.023 0.1 ATC - 1 meter from package 7.843 8.517 1.980 0.324 10 to E-52876 Pages from Chapter 4A and 4A-11 NP Page 2 of 3 1.780 The correct value Chapter 4A-11-DOS-18-011415-031-NPV-1.0
TN International Réf. : DOS-18-011415-032-NPV Rév. 0 Page 12/48 NON PROPRIETARY VERSION section P1 Bottom section 1.482.10-2 7.242.10-5 7.380.10-2 0.089 Calculation ref. <7>
2 5 and 6 The maximum EDR is obtained in the uninterrupted section at mid-height of the cavity.
The criterion of 0.1 mSv/h under RTC is satisfied at 2 meters from the external surface of the vertical walls of the vehicle for content 1 loaded in the MTR-68 basket.
5.2.2. MTR-68 basket - content 2 Contact with package and vehicle The maximum EDRs under routine transport conditions obtained in contact with the package at locations P1 to P7 for content 2 loaded in the MTR-68 basket are given in the following table:
Calculation points RTC - EDR in contact with package (mSv/h)
Neutron Capture gamma Primary gamma Total Top axial P6 Center 1.411.10-4 1.141.10-6 7.615.10-1 0.762 P7 Orifice 9.815.10-5 1.045.10-6 1.090 1.090 Radial P4 Top of trunnion 6.125.10-5 3.557.10-7 4.375.10-1 0.438 P4 Base of trunnion 1.669.10-4 5.234.10-7 1.780 1.780 P3 Top section 1.274.10-4 5.869.10-7 9.838.10-1 0.984 P2 Uninterrupted section 1.550.10-4 6.846.10-7 1.013 1.013 P1 Bottom section 1.092.10-4 5.001.10-7 7.246.10-1 0.725 Bottom axial P5 Center 2.028.10-4 8.763.10-7 1.097 1.098 Calculation ref. <7>
8 to 10 11 to 13 The maximum EDR is obtained at the trunnion base (under the trunnion) and is below 2 mSv/h.
The criterion of 10 mSv/h in contact with the package model, and especially the criterion of 2 mSv/h in contact with the transport vehicle under RTC are therefore satisfied.
2 meters from vehicle The maximum EDRs under routine transport conditions obtained 2 meters from the external surface of the vertical walls of the vehicle at locations P1 to P4 for content 2 loaded in the MTR-68 basket are given in the following table:
Calculation points RTC - EDR 2 meters from the vehicle (mSv/h)
Neutron Capture gamma Primary gamma Total Radial P4 Top of trunnion 7.702.10-6 3.361.10-8 7.660.10-2 0.077 P3 Top section 8.119.10-6 3.479.10-8 9.365.10-2 0.094 P2 Uninterrupted 8.643.10-6 3.549.10-8 8.769.10-2 0.088 to E-52876 Pages from Chapter 4A and 4A-11 NP Page 3 of 3 The correct value 1.780 Chapter 4A-11-DOS-18-011415-031-NPV-1.0