ML14337A095
| ML14337A095 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Oconee, Arkansas Nuclear, Crane  |
| Issue date: | 11/25/2014 |
| From: | Elliott G AREVA |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 50636 | |
| Download: ML14337A095 (3) | |
Text
1112512014 U.S. Nuclear Reeulatorv Commission OterationsCenter Event Renort Pn*p I Part 21 (PAR) Event # 50636 Rep Org: AREVA, INC. Notification Date I Time: 11/25/2014 10:10 (EST)
Supplier: AREVA, INC. Event Date I Time: 10/19/2014 (EST)
Last Modification: 11/25/2014 Region: 1 Docket #:
City: LYNCHBURG Agreement State: Yes County: License #:
State: VA NRC Notified by: GAYLE ELLIOTT Notifications: JAMES NOGGLE R1DO HQ Ops Officer: JOHN SHOEMAKER FRANK EHRHARDT R2DO Emergency Class: NON EMERGENCY ERIC DUNCAN R3DO 10 CFR Section: VIVIAN CAMPBELL R4DO 21.21(d)(3)(i) DEFECTS AND NONCOMPLIANCE PART 21 GROUP EMAIL HAROLD CHERNOFF EMAIL 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 TAC03 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, Inc., 3315 Old Forest Road Lynchburg, VA 24501 Ph. # 434-841-0306.
11/23.42013 22: 1i 4i4dJdZ/c4U WHli-Ut IUL' M=nUU, ,- -
Reportable Defect fi) Name and addressof the individualorindividuals informing the Commission.
Gayle Elliott, AREVA Inc., 3315 Old Forest Road, Lynchburg, VA 24501 (ii) Identiflcation of thejfcllty, the activity, or the basic component suppliedfor such facility orsuch activity within the United States which fails to comply or containsa defect.
The defect is inthe LOCA analysps prnvirderi hy ARFVA Inc. for B&W plantt.
(iii) Identificationof the firm constructingthe faility or supplying the basic component which fails to comply orcontains a defect.
AREVA Inc.
(iv) Nature of the defect orfailure to comply and the safrty hazard which Is createdor could be created by such defect orfailureto comply.
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.
(v) The date on which the information of such defect orfailure to comply was obtained.
October 19, 2014 (vi) in the case of a basic component which containsa defect or fails to comply, the number and location of these components in use at,suppliedfor, being suppliedfor, or may be suppliedfor, manufactured,or being manufacturedfor one or morefaclities or activities subject to the regulationsin this part.
The defect exists for the following plants:
Oconee Nuclear Station Unit I, Oconee Nuclear Station Unit 2, Oconee Nuclear Station Unit 3, Arkansas Nuclear One Unit 1, Three Mile Island Unit 1, Davis-Besse Unit 1 Page 1 of 2
(vii) The correctiveaction which has been, is being, or will be taken; the name of the Individualor organizationresponsiblefor the action; and the length of time that has been or will be taken to complete the action.
AREVA Inc. recommended to the affected plants that the LHR limits be reduced by 2 kw/ft at middle-of-life conditions. ThIs reduction in LHR limits will result in the peak cladding temperature limit being met. The individual utilities are responsible for this action and AREVA believes that this action has been implemented by each utility.
(viii)Any advice related to the defect orfailure to comply about the facility, activity, or basic component thathas been, is being, or will be given to purchasersor licensees.
AREVA Inc. recommended to the affected plants that the LHR limits be reduced by 2 kw/ft at middle-of-life conditions.
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