ML19319B318

NRC-2018-000831 - Resp 2 - Interim, (NRC Technical Data Needs for Harvesting) Part 9 of 10

ML19319B318
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Issue date:	11/13/2019
From:	NRC/OCIO
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References
FOIA, NRC-2018-000831
Download: ML19319B318 (5)

Text

NRC High-Priority Data Needs for Harvesting NRC Staff March 7, 2017

Metals

• RPV

- High fluence & high shift vessel with well-established unirradiated properties (or a means to estimate them)

• Through thickness section to validate fluence & attenuation models

• Measure fluence, toughness, & chemistry as a function of through-thickness position

- Samples from virtually any vessel

• Of sufficient size to enable measurement of both the Charpy transition curve and master curve transition temperature T0

• This testing

- Enables demonstration of the conservatism of regulatory approaches for transition temperature prediction

- Provides data supporting evolution from the use of correlative (Charpy-based) to direct measurement (fracture toughness-based) approaches 2

Metals

• CASS and Internals

- High fluence reactor internals

• >50 dpa 304 SS from high core outlet temp plant

• Bounding temperature and high fluence for void swelling

- Thermally aged unirradiated CASS

• >30 years at ~320°C; Validate accelerated aging data

- Moderate fluence (1-2 dpa) CASS

• Bolster technical basis for embrittlement in this fluence range

• Components with known flaws

- Example: weld overlays over known flaws

• NDE evaluations or to assess effectiveness of mitigation techniques

• Components with limiting fatigue life

- Confirm fatigue calculations are accurate by inspecting for flaws 3

Electrical

• Cables

- Low and medium voltage cables

- Cables protected with fire retardant coating

• Electrical components

- 1E MOVs from harsh and mild environments

- 1E Air operated valves; 4160 1E breakers

- 1E Molded case breakers 480V, 250V DC, 125 VDC,

- 1E Relays from mild environment GE - HFA, Agastat timing relays, any from Westinghouse, Potter Brumfield, Stuthers Dunn etc.,

- Electrical penetrations; Batteries

• Fire research interest

- Electrical enclosures

• Distribution : switchgear, MCCs, LCs l Control : Horseshoe, SSCP, ASP, etc.

4

Concrete

• Structures exposed to high radiation

• Post-tensioned structures

• Corrosion of reinforcing steel, tendon, liner, embedment

• Spent fuel pool and transfer canal-boric acid attack on concrete in PWRs

• Alkali Aggregate Reaction

• Large structural sections for testing 5