19 octobre 2014
Areva précise que le modèle de conductivité thermique retenu pour le combustible des réacteurs n’est pas en conformité avec le taux de combustion de ces combustibles. La limite des 2 200° F est dépassée. Les réacteurs concernés par le problème sont Oconee 3, Arkansas 1, Three Mile Island 1 et Davis-Besse 1.
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Event Number : 50636
Licensee : AREVA, INC.
City : LYNCHBURG State : VA
Event Date : 10/19/2014
Emergency Class : NON EMERGENCY 10 CFR Section : 21.21(d)(3)(i) - DEFECTS AND NONCOMPLIANCE
Event Text
PART 21 - DEFECT IN LOCA ANALYSIS FOR B&W PLANTS
The following information was summarized from the report obtained from the vendor via facsimile :
"The defect is related to the thermal conductivity model in the codes TACO3 and GDTACO which are used in the AREVA LOCA model for B&W plants. The thermal conductivity model does not adequately represent the change in conductivity with burnup for the fuel. The correction of the thermal conductivity model results in the peak cladding temperature limit in 10 CFR 50.46 (2200 degrees F) being exceeded.
"The defect exists for the following plants : Oconee Nuclear Station Unit 1, Oconee Nuclear Station Unit 2, Oconee Nuclear Station Unit 3, Arkansas Nuclear One Unit 1, Three Mile Island Unit 1, and Davis-Besse Unit 1"
If there are any technical questions or concerns, please contact :
Gayle Elliott AREVA, lnc., 3315 Old Forest Road Lynchburg, VA 24501 Ph. # 434-841-0306.
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