Letter Sequence Meeting |
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MONTHYEARML22307A0042022-11-0707 November 2022
Slides - Pre-Application November 7, 2022 Meeting Slides
Project stage: Meeting
ML22318A1992022-11-21021 November 2022
Summary of November 7, 2022, Meeting with Indiana Michigan Power Company Regarding Neutron Flux Instrumentation for Donald C. Cook Nuclear Plant, Unit Nos. 1 and 2
Project stage: Meeting
2022-11-21
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Text
Amendment Request to Remove Neutron Flux from TS Table 3.3.3-1, Post Accident Monitoring Instrumentation November 7, 2022 1
Background
- At Cook Plant Unit 2, one required channel of neutron flux instrumentation is unable to meet Environmental Qualification requirements, but otherwise fully functional
- Vendor is winding down support for Gamma-Metrics instruments by end of 2024 and was not available for emergent support for repair/replacement during most recent U2 refueling outage
- Industry precedent exists for neutron flux variable to be considered as Category 3 instrumentation 2
=
Background===
3
Proposed Change
- This would eliminate need for Environmental Qualification of Wide Range Neutron Flux instrumentation 4
Justification
- Function: Confirm initial Reactor Shutdown
- With normal containment environment, WR NIs EQ requirements are not applicable
- With harsh containment environment:
- adverse effects of steam or radiation are not immediate
- WR NIs operable for initial determination of reactor trip 5
Justification
- Function: Critical Safety Function Status Monitoring
- With normal containment environment, WR NIs EQ requirements are not applicable
- With harsh containment environment
- Other means of indication available to determine if imminent threat to critical safety function exists
- e.g., Fully Environmentally Qualified Core Exit Thermocouples, RCS Hot Leg and Cold Leg instruments address this function provided by Wide Range NIs 6
Industry Review
- At least five plants do not include Neutron Flux in their PAM TS
- Ginna,
- Byron/Braidwood,
- Comanche Peak and
- Farley 7
