BVY 11-001, License Renewal Application Supplemental Information

License Renewal Application Supplemental Information

ML110250261
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	01/21/2011
From:	Michael Colomb Entergy Nuclear Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
BVY 11-001
Download: ML110250261 (5)

Text

SEntergy Entergy Nuclear Operations, Inc.

Vermont Yankee 320 Governor Hunt Rd Vernon, VT 05354 Tel 802 257 7711 I

Michael J. Colomb Site Vice President BVY 11-001 January 21, 2011 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

REFERENCES:

License Renewal Application Supplemental Information Vermont Yankee Nuclear Power Station Docket No. 50-271 License No. DPR-28

1.

Letter, Entergy to USNRC, "Vermont Yankee Nuclear Power Station, License No. DPR-28, License Renewal Application," BVY 06-09, dated January 25, 2006

Dear Sir or Madam:

On January 25, 2006, Entergy Nuclear Operations, Inc. and Entergy Nuclear Vermont Yankee, LLC (Entergy) submitted the License Renewal Application (LRA) for the Vermont Yankee Nuclear Power Station (VYNPS) as indicated by Reference 1. of this letter provides supplemental information to the LRA to provide clarifying information on the selection of sample size for the One-Time Inspection and Selective Leaching programs.

There are no new regulatory commitments being made in this letter.

Should you have any questions or require additional information concerning this submittal, please contact Mr. Robert Wanczyk at 802-451-3166.

I declare under penalty of perjury, that the foregoing is true and correct. Executed on January 21,2011.

Sincerely,

[MJC/PLC]

All -ý

BVY 11-001 / Page 2 of 2 Attachments: 1. License Renewal Application Supplemental Information cc:

Mr. Eric J. Leeds, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission One White Flint North 13H16M 11555 Rockville Pike Rockville, MD 20852-2738 Mr. William M. Dean, Regional Administrator U.S. Nuclear Regulatory Commission, Region 1 475 Allendale Road King of Prussia, PA 19406-1415 Mr. Robert Kuntz, Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North 11 F1 11555 Rockville Pike Rockville, MD 20852-2738 Mr. James S. Kim, Project Manager Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 08C2A Washington, DC 20555 USNRC Resident Inspector Entergy Nuclear Vermont Yankee 320 Governor Hunt Road Vernon, Vermont 05354 Ms. Elizabeth Miller, Commissioner VT Department of Public Service 112 State Street - Drawer 20 Montpelier, Vermont 05620-2601

BVY 11-001 Vermont Yankee Nuclear Power Station License No. DPR-28 (Docket No. 50-271)

License Renewal Application Supplemental Information

BVY 11-001 / Attachment 1 / Page 1 of 2 Vermont Yankee Nuclear Power Station License Renewal Application - Supplemental Information Vermont Yankee Nuclear Power Station (VYNPS) provides the following supplemental information as a result of recent regulatory and industry correspondence potentially relevant to aging management. The information covers the following areas:

1. One-Time Inspection Program

2. Selective Leaching Program One-Time Inspection Program License Renewal Application (LRA) Section B.1.21, One-Time Inspection, describes the determination of the sample size based on an assessment of materials of fabrication, environment, plausible aging effects, and operating experience and identification of the inspection locations in the system or component based on the aging effect. VYNPS is providing additional specific information regarding the sample of components that will be inspected.

Representative samples are chosen from each population. Each group of components with the same material-environment combination is considered a separate population. The sample size is based on Chapter 4 of EPRI Report TR-107514, "Age Related Degradation Inspection Method and Demonstration," which outlines a method to determine the number of inspections required for 90% confidence that 90% of the population does not experience degradation (90/90). Inspection locations are determined based on susceptibility, accessibility, dose considerations and operating experience. Where practical, inspections focus on the bounding or lead components most susceptible to aging due to time in service, and severity of operating conditions.

For small populations (100 or less), the EPRI TR-107514 criterion will be modified such that the sample is at least 20% of the population with no less than 2 inspections. This method provides a reasonable sample number for all populations.

With representative sampling focused on susceptible locations, the One-Time Inspection Program provides reasonable assurance that applicable components will continue to perform their intended function through the PEO.

Selective Leaching Program LRA Section B.1.25, Selective Leaching, includes a one-time visual inspection and hardness measurement of selected components that may be susceptible to selective leaching. VYNPS is providing additional specific information regarding the sample of components that will be inspected.

Representative samples are chosen from each population. Each group of components with the same material-environment combination is considered a separate population. The sample size is based on Chapter 4 of EPRI Report TR-107514, "Age Related Degradation Inspection Method and Demonstration," which outlines a method to determine the number of inspections required for 90% confidence that 90% of the population does not experience degradation (90/90). Inspection locations are determined based on susceptibility, accessibility, dose considerations and operating experience. Where practical, inspections focus on the bounding or lead components most susceptible to aging due to time in service, and severity of operating conditions.

BVY 11-001 / Attachment 1 / Page 2 of 2 For small populations (100 or less), the EPRI TR-1 07514 criterion will be modified such that the sample is at least 20% of the population with no less than 2 inspections. This method provides a reasonable sample number for all populations.

With representative sampling focused on susceptible locations, the Selective Leaching Program provides reasonable assurance that applicable components will continue to perform their intended function through the PEO.

LRA Section B.1.25 is revised as shown below to allow component hardness verification using mechanical inspection techniques, specifically destructive testing (when the opportunity arises),

chipping, or scraping, in lieu of hardness measurement. Hardness measurement of all components in the sample population may not be feasible due to component location and configuration. New text is shown underlined. Deleted text is shown as strikethrough.

Program Description The Selective Leaching Program at VYNPS will be comparable to the program described in NUREG-1801,Section XI.M33 Selective Leaching of Materials.

The Selective Leaching Program will ensure the integrity of components made of cast iron, bronze, brass, and other alloys exposed to raw water, treated water, or groundwater that may lead to selective leaching. The program includes a onc tome visual inspeci*On and ha~rdness meaucen assessment of selected components that may be susceptible to selective leaching to determine whether loss of material due to selective leaching is occurring, and whether the process will affect the ability of the components to perform their intended functions for the period of extended operation. For each component sampled, the assessment entails one-time visual inspection and hardness measurement or verification using mechanical inspection techniques, specifically destructive testing (when the opportunity arises), chipping, or scraping.

The program will be initiated prior to the period of extended operation.