ML21124A065

From kanterella
Jump to navigation Jump to search
Xcel Energy Presentation for May 6, 2021 Public Meeting to Discuss 24-Month Cycles at Prairie Island Nuclear Generating Plant, Units 1 and 2
ML21124A065
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 05/06/2021
From: Robert Kuntz
Plant Licensing Branch III
To: Domingos C
Northern States Power Co
Kuntz R
References
Download: ML21124A065 (11)


Text

Prairie Island 24-Month Operating Cycle License Amendment Request May 6, 2021

Agenda

  • Opening Remarks
  • Background
  • Approach
  • Precedents
  • Schedule 2

Opening Remarks

Purpose:

Discuss proposed license amendment to use the deterministic guidance of GL 91-04 to adopt a 24-month operating cycle in lieu of using the Prairie Island (PI) TS Surveillance Frequency Control Program (SFCP) 3

Background

  • A limitation was incorporated into TS SR 3.0.2 during transition to ITS in 2002 allowing NSPM (the licensee) to replace the custom PI TS SR Frequency of Each Refueling Shutdown to a value of 24-months
  • Analysis demonstrated that an SR Frequency of up to 24-months was acceptable for this subset of SRs 4

Background (continued)

- Relocated most SRs to licensee control under SFCP defined by TS

- Relocated the previous TS SR 3.0.2 limitation on grace to the Surveillance Test Interval (STI) document 5

Background (continued)

  • SRs that require an outage and have 24-month Frequency with no allowance for grace have resulted in refueling outages starting earlier with each successive outage
  • Adding grace to SRs with 24-month Frequency in the STI document will allow scheduling of outage start dates that are consistent each year 6

Approach Submit a LAR to use the deterministic guidance of GL 91-04 to adopt a 24-month operating cycle, which will include:

- A summary of the methodology and assumptions used in the PI instrument drift analysis

- A summary of evaluations that confirm confidence for a calibration interval of 30 months for affected instruments

- Confirmation of values of drift used in setpoint calculations

- A list of applicable instruments and channels by TS section

- A confirmation that conditions/assumptions of the setpoint and safety analyses are reflected in PI surveillance procedures

- A summary description of the monitoring program 7

Approach (continued)

Proposed TS Markups 8

Precedents

  • Fermi
  • Robinson 9

Schedule

  • NSPM plans to submit the LAR in early August in support of implementing the amendment before the 1R33 refueling outage that starts in the fall of 2022
  • NSPM will be requesting a 12-month review following acceptance of the LAR 10