Letter Sequence Draft Approval |
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Results
Other: CNRO-2003-00020, Arkansas, Unit 2 and Waterford, Unit 3, Relaxation Requests to NRC Order EA-03-009, CNRO-2003-00039, Entergy Operations, Inc. - Relaxation Request to NRC Order EA-03-009 for Control Element Drive Mechanism Nozzles, CNRO-2004-00020, Relaxation Request 4 to NRC Order EA-03-009 for the Control Element Drive Mechanism Nozzles, ML032320180, ML032770010, ML032820500, ML032820541
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MONTHYEARCNRO-2003-00020, Arkansas, Unit 2 and Waterford, Unit 3, Relaxation Requests to NRC Order EA-03-0092003-06-11011 June 2003
Arkansas, Unit 2 and Waterford, Unit 3, Relaxation Requests to NRC Order EA-03-009
Project stage: Other
2CAN060308, Response to Request for Additional Information on the ANO-2 Relaxation from Performing a Bare Metal Visual Inspection from the February 11, 2003 Reactor Pressure Vessel Head Order2003-06-26026 June 2003
Response to Request for Additional Information on the ANO-2 Relaxation from Performing a Bare Metal Visual Inspection from the February 11, 2003 Reactor Pressure Vessel Head Order
Project stage: Response to RAI
ML0322000892003-08-0808 August 2003
Notice of Forthcoming Meeting Relaxation Request from Vessel Head Inspection Order
Project stage: Request
ML0323201802003-08-14014 August 2003
8/14/03, EOI Will Discuss Its May 8, June 11, & July 1, 2003, Relaxation Requests from NRCs Vessel Head Inspection Order
Project stage: Other
2CAN080306, Supplemental Response to Bare Metal Visual Relaxation Request for ANO-2 Regarding NRC Order EA-03-0092003-08-27027 August 2003
Supplemental Response to Bare Metal Visual Relaxation Request for ANO-2 Regarding NRC Order EA-03-009
Project stage: Supplement
ML0324104502003-08-29029 August 2003
Summary of Meeting with Entergy to Discuss Its Relaxation Requests from the Vessel Head Inspection Order
Project stage: Meeting
CNRO-2003-00039, Entergy Operations, Inc. - Relaxation Request to NRC Order EA-03-009 for Control Element Drive Mechanism Nozzles2003-09-12012 September 2003
Entergy Operations, Inc. - Relaxation Request to NRC Order EA-03-009 for Control Element Drive Mechanism Nozzles
Project stage: Other
ML0326807632003-09-25025 September 2003
Draft Safety Evaluation, Proprietary Information
Project stage: Draft Approval
ML0326807522003-09-25025 September 2003
Letter, Proprietary Review of Draft Safety Evaluation
Project stage: Draft Approval
ML0327700102003-10-0202 October 2003
Proprietary Information Review, Material Properties and Modeling Methods Used in ANO Unit 2 Welding Residual Stress Analyses
Project stage: Other
ML0328205412003-10-0909 October 2003
Relaxation Request from NRC Order EA-03-009 Regarding the Control Element Drive Mechanism Nozzles
Project stage: Other
ML0328205002003-10-0909 October 2003
Relaxation Request from NRC Order EA-03-009 Regarding the Control Element Drive Mechanism Nozzles
Project stage: Other
CNRO-2003-00051, Supplemental Information Pertaining to Relaxation Requests to NRC Order EA-03-0092003-10-16016 October 2003
Supplemental Information Pertaining to Relaxation Requests to NRC Order EA-03-009
Project stage: Supplement
CNRO-2004-00020, Relaxation Request 4 to NRC Order EA-03-009 for the Control Element Drive Mechanism Nozzles2004-04-15015 April 2004
Relaxation Request 4 to NRC Order EA-03-009 for the Control Element Drive Mechanism Nozzles
Project stage: Other
2003-08-14
[Table View] |
Text
PARTIAL DRAFT SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELAXATION REQUEST FROM ORDER EA-03-009 REGARDING THE VESSEL HEAD PENETRATION CONTROL ELEMENT DRIVE MECHANISM NOZZLES FACILITY OPERATING LICENSE NO. NPF-6 ENTERGY OPERATIONS, INC.
ARKANSAS NUCLEAR ONE, UNIT 2 (ANO-2)
DOCKET NO. 50-368 X.1 Stress Analysis Using Finite Element Method (FEM) Modeling The staff has evaluated information regarding the FEM modeling. Since the entire information is classified as proprietary, the staff can only discuss its findings at a very general level. The licensees FEM model considers welding processes by simulating melting and solidification of individual welding passes through a combination of thermal and structural models. Heat treatment history has also been considered. This method of calculating residual stresses is consistent with industry practice and is acceptable to the staff. In addition, the licensee considered all test and operating loads. The basic stress-strain properties for Alloy 600 nozzle and 182 J-groove weld materials used in the stress analysis are generic in shape, which were modified based on some basic material property from ANO-2's certified material test report (CMTR). Considering the lack of plant-specific data, this engineering approach in modifying the generic stress-strain curve is appropriate. Further, the CMTR material property affects the maximum stress of the nozzle more than what the generic stress-strain shape does to the stress, providing additional support to the licensees approach. The use of the stress-strain law for an elastic-perfectly plastic model for the 182 weld material may not be a good representation of the materials real behavior. However, it was used to overcome a modeling limitation of the FEM Code so that more realistic weld stresses would result. In summary, the FEM modeling is more than adequate, and the resulting stresses can be used as input to the licensees fracture mechanics evaluation.
