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- W97801211 abstract "Since FLIP fuel is enriched to greater than 20%, it is very desirable to keep this fuel 'self-protecting'; i.e., giving a radiation level of 100 rem/hr or more at three feet in air with no intervening shielding. If we cannot keep this fuel self-protecting, compliance with the increased NRC physical security requirements would be extremely difficult if not impossible. A computer code was written which calculates the total external gamma dose equivalent rate from an irradiated FLIP fuel element. The code has these general features: 1. The fuel element is treated as a cylindrical source with self-absorption. 2. The dose equivalent rate can be calculated at any distance at two different locations: the midpoint of the side of the element, and the end of the element. 3. The intervening medium between the element and the dose point can be air or water. 4. The neutron activation of the stainless steel cladding and the resulting gamma dose rate is included. 5. The gamma dose rate from the fission product activity is calculated by the Wigner-Way relationship. 6. Gamma buildup factors are included when the intervening medium is water. These buildup factors are based on Taylor's two-exponential method. 7. Any fuel elementmore » in the core can be used in the calculation since the individual fuel element power density is an input parameter. 8. The actual operating power history of the reactor is an input parameter and a projected operating history into the future can be included as desired. 9. The time from the end of the last operating period to the point at which the dose rate is calculated is an arbitrary input parameter. Only external gamma dose rates are calculated by the code, whereas the federal regulations state that the total (beta plus gamma) dose rate should exceed 100 rem/hr. By neglecting the beta contribution in our calculation, we are adding a degree of conservatism. Using our past operating history, the code predicts that we will have to operate a minimum of about 13 MWhr per week to keep any FLIP element in the core self-protecting for at least 64 hours, the longest time interval that we normally experience between operations (a typical weekend). (author)« less" @default.
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- W97801211 date "1980-07-01" @default.
- W97801211 modified "2023-09-27" @default.
- W97801211 title "Self-protection of FLIP fuel: Calculational techniques" @default.
- W97801211 hasPublicationYear "1980" @default.
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