ML17198A263

Pre-Application Meeting

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

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

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

Current Licensing Basis

• USAR section 12.2.12.3, Special Lifting Devices Evaluation, states in regard to NDE that:

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

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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

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

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

Schedule

• Anticipate submittal prior to August 21, 2017

• Impact on 1R31 refueling outage beginning September, 2018 7

Feedback

• Questions or comments?

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