ML17198A263
| ML17198A263 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 07/17/2017 |
| From: | Plant Licensing Branch III, Xcel Energy |
| To: | Robert Kuntz Plant Licensing Branch III |
| Kuntz R, NRR/DORL/LPLIII | |
| References | |
| Download: ML17198A263 (8) | |
Text
1 Prairie Island Nuclear Generating Plant Pre-Application Meeting July 17, 2017 License Amendment Request to Revise the NDE Inspection Interval for Special Lifting Devices 1
2 Meeting Purpose
- Describe a future license amendment request
- Establish a common understanding of the scope of the request
- Establish a common understanding of the schedule
- Obtain NRC feedback 2
3 Current Licensing Basis
Visual inspection and non-destructive examination (NDE) testing of major load carrying welds and any other critical areas is performed consistent with ANSI N14.6-1978 (Reference 37) annually or prior to each use of the Special Lifting Device, typically at each refueling outage (References 18, 37, 38, 39, and 32).
- Special Lifting Devices at Prairie Island comprised of:
- Reactor Head Lifting Rigs
- Internals Lifting Rigs
- Turbine Spreader Assembly 3
4
Background
- Special Lifting Devices originally designed, fabricated and tested circa 1970-71
- Generic Letter 80-113
- Noted issuance of NUREG-0612 and requested licensee responses
- NUREG-0612 Guideline 4
- Special Lifting Devices should satisfy the guidelines of ANSI N14.6-1978
- ANSI N14.6-1978, Shipping Containers Weighing 10,000 Pounds (4500 kg) or More for Nuclear Materials
- Specifies continued NDE testing on a periodicity of annually or prior to each use 4
5 Scope of Request
- Proposed change is to revise NDE inspection frequency from annually or prior to each use, typically at each refueling outage, to a ten year frequency
- Applicable to the identified Special Lifting Devices
- Visual and dimensional inspections will continue at a frequency of annually or prior to each use, typically at each refueling outage
- Reason for proposed change:
- Devices used under controlled conditions and at frequencies of use substantially less severe than those possible for the type of lifting device for which ANSI N14.6-1978 was originally intended
- Reduction in personnel radiation exposure 5
6 Basis
- High strength materials with significant structural margins
- Factors of safety substantially exceed those specified in ANSI N14.6-1978
- Limited usage
- Minimal loading cycles
- Fatigue is negligible given actual usage
- Evaluation of available NDE inspection results
- Of the identified indications reviewed, none were attributed to service related defects
- Industry Precedent 6
7 Schedule
- Anticipate submittal prior to August 21, 2017
- Impact on 1R31 refueling outage beginning September, 2018 7
8 Feedback
- Questions or comments?
8