ML21221A020

Nis Pr Bypass Test Panel License Amendment Request

ML21221A020
Person / Time
Site:	Prairie Island
Issue date:	08/11/2021
From:	Xcel Energy
To:	Division of Operating Reactor Licensing
Kuntz R
References
Download: ML21221A020 (12)

Text

Prairie Island NIS PR Bypass Test Panel License Amendment Request August 11, 2021

Agenda

• Purpose

• Background

• Approach

• Precedents

• Schedule

• Closing Remarks 2

Purpose Discuss a proposed license amendment request (LAR) to change Technical Specifications (TS) to allow testing the Power Range (PR) Nuclear Instrumentation System (NIS) channels with the channel in bypass following installation of permanent bypass capability 3

Background

- Reducing trip state vulnerability during PR NIS testing

- The current design places the PR NIS channel in trip during testing and reduces the trip logic from 2/4 to 1/3 4

Approach

- Reduce susceptibility to spurious trips during testing by installing permanent bypass test capability and changing TS to allow testing in bypass (trip logic while testing becomes 2/3)

• Plant Modifications: Install and implement a PR NIS Bypass Test Panel of Westinghouse design

• TS changes:

- Revise the Note to TS 3.3.1, Condition D, based on a modification that allows the channel to be tested in bypass

- Add Notes to SR 3.3.1.7 and SR 3.3.1.8 to exclude testing the RPS input relays during a COT 5

Approach (continued)

Proposed TS Markups 6

Approach (continued)

Proposed TS Markups (continued) 7

Approach (continued)

Proposed TS Markups (continued) 8

Precedents

• Ginna Amendment 132 9

Schedule

- Submit the LAR in September 2021

- Will request a review within 12 months of acceptance

- Implementation will be 30 days following approval and installation on Unit 1

• Unit 2 hardware installed Fall 2021

• Unit 1 hardware installed Fall 2022 10

Closing Remarks Questions?

11