1CAN041006, Clarification to Summary of Analyses Related to ANO-1 Once-Through Steam Generator Tube Thermal Loads
| ML101190465 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 04/29/2010 |
| From: | David Bice Entergy Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 1CAN041006 | |
| Download: ML101190465 (2) | |
Text
1CAN041006 April 29, 2010 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555
SUBJECT:
Clarification to Summary of Analyses Related to ANO-1 Once-Through Steam Generator Tube Thermal Loads Arkansas Nuclear One, Unit 1 Docket No. 50-313 License No. DPR-51
REFERENCE:
Entergy letter to NRC dated January 26, 2010, Summary of Analysis Related to ANO-1 Once-Through Steam Generator Tube Thermal Loads Due to Breaks in RCS Upper Hot Leg Large-Bore Piping (1CAN011004)
Dear Sir or Madam:
By the referenced submittal, Entergy Operations, Inc. (Entergy) provided a summary of actions that had been taken to address the once-through steam generator tube thermal loads due to breaks in the large-bore piping and steam generator tube integrity at Arkansas Nuclear One, Unit 1. Subsequent to this submittal, the NRC determined that a potion of the submittal needed to be clarified.
During a conference call on April 6, 2010, between representatives from the NRC and Entergy, it was agreed that the last full paragraph of the reference submittal needs to be revised. The revised paragraph is below. The change is underlined for ease of review.
The verification performed by AREVA is based on the TS 5.5.9 SG program which implements inspection requirements that ensure SG tube integrity is assessed on a routine basis and that degrading tubes are removed from service prior to exceeding the 40% TW limit. The program requires projected flaw growth to be determined to provide high confidence that a degraded tube will not exceed the calculated structural limit prior to the next scheduled inspection.
Entergy Operations, Inc.
1448 S.R. 333 Russellville, AR 72802 Tel 479-858-5338 David B. Bice Acting Manager, Licensing Arkansas Nuclear One
1CAN041006 Page 2 of 2 This letter contains no new commitments.
If you have any questions or require additional information, please contact me at 479-858-5338.
Sincerely, DBB/rwc cc:
Mr. Elmo E. Collins Regional Administrator U. S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 NRC Senior Resident Inspector Arkansas Nuclear One P. O. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Kaly Kalyanam MS O-8 B1 One White Flint North 11555 Rockville Pike Rockville, MD 20852 Mr. Bernard R. Bevill Arkansas Department of Health Radiation Control Section 4815 West Markham Street Slot #30 Little Rock, AR 72205