ML21036A117

SNC Slides - Pre-Submittal Meeting on February 16, 2021 - Beacon LAR

ML21036A117
Person / Time
Site:	Vogtle, Farley
Issue date:	02/05/2021
From:	Southern Nuclear Operating Co
To:	Division of Operating Reactor Licensing
Lamb J
Shared Package
ML21036A137	List: ML21036A117 ML21047A262
References
EPID L-2021-LRM-0011
Download: ML21036A117 (13)

Text

Farley & Vogtle BEACON Technical Specification Monitoring (TSM) Pre-Submittal Meeting February 2021

Meeting Purpose

• Discuss Farley and Vogtle license amendment request (LAR) to adopt Westinghouse BEACON TSM, with the goal of identifying any areas that may require additional documentation or justification

• Two primary discussion topics:

1. Westinghouse BEACON TSM Background

2. LAR Content 2

BEACON TSM Background

Background

• Core power distribution information is used to verify to following core parameters:

• Control rod position (TS 3.1.7)

• Heat Flux Hot Channel Factor (TS 3.2.1)

• Nuclear Enthalpy Rise Hot Channel Factor (TS 3.2.2)

• Quadrant Power Tilt Ratio (QPTR) (TS 3.2.4)

• Axial flux difference (AFD) for calibration of OTT reactor trip function (TS 3.3.1)

• Core power distribution information is typically obtained by taking a monthly flux map using the Movable Incore Detector System (MIDS) 4

Background - BEACON

• Best Estimate Analyzer for Core Operations - Nuclear (BEACON) core analysis system has capability to provide NRC-approved alternative to using MIDS to verify TS power distribution limits

• Dedicated on-line core power distribution monitoring system (PDMS)

• Utilizes continuous information from plant instrumentation to determine core power distribution using the 3-D Advanced Nodal Code (ANC)

• BEACON-TSM (Technical Specification Monitor) provides functionality needed to integrate BEACON into the plant TS to verify core power distribution limits

• Advantages of using the BEACON-TSM application of PDMS include:

• Essentially continuous monitoring of the core power distribution

• Flux maps using MIDS only required for BEACON calibration

• MIDS Flux maps typically performed every 31 effective full power days (EFPD)

• Will allow extending performance of MIDS flux maps using up to 180 EFPD 5

Required TS Changes

• The following TS and/or associated TS Bases explicitly mention using movable incore detectors or flux maps:

• TS 3.1.7 Rod Position Indication

• TS 3.2.1 Heat Flux Hot Channel Factor (FQ(Z))

• TS 3.2.2 Nuclear Enthalpy Rise Hot Channel Factor (FNH)

• TS 3.2.4 Quadrant Power Tilt Ratio (QPTR)

• TS 3.3.1 Reactor Trip System (RTS) Instrumentation

• Will revise TS to refer to using core power distribution information; TS Bases will clarify this can be met using either MIDS or BEACON PDMS

• Functionality requirements for the BEACON PDMS will be included in the owner-controlled Technical Requirements Manual (TRM) and implemented in plant procedures 6

Precedent Use of BEACON-TSM application of PDMS for TS Surveillances approved for the following stations:

• V. C. Summer, Amendment 142, April 9, 1999 (ADAMS Accession Number ML012260068)

• Salem Units 1 and 2, Amendments 237 (Unit 1) and 218 (Unit 2), November 6, 2000, (ADAMS Accession Number ML003761792/ML003767901)

• Diablo Canyon Units 1 and 2, Amendments 164 (Unit 1) and 166 Unit 2, March 31, 2004, (ADAMS Accession Number ML040920245)

• STP Units 1 and 2, Amendments 175 (Unit 1) and 163 (Unit 2), March 31, 2006 (ADAMS Accession Number ML060760501/ML060950451)

• Callaway, Amendment 182, March 21, 2007, (ADAMS Accession Number ML070460584/ML070680350)

• Commanche Peak Units 1 and 2, Amendments 144 (Unit 1) and 144 (Unit 2), April 2, 2008, (ADAMS Accession Number ML080510083/ML080500627)

• Watts Bar Unit 1, Amendment 82, October 27, 2009, (ADAMS Accession Number ML092710381)

• Wolf Creek, Amendment 188, July 23, 2010, (ADAMS Accession Number ML100820517)

• Prairie Island Units 1 and 2, Amendments 201 (Unit 1) and 188 (Unit 2), May 4, 2011, (ADAMS Accession Number ML103430498) 7

BEACON TSM LAR Content LAR Content ENCLOSURE: ATTACHMENTS:

1.

SUMMARY

DESCRIPTION 1. Evaluation for Excluding BEACON Power Distribution Monitoring System (PDMS) Requirements from the

2. DETAILED DESCRIPTION Technical Specifications

2. Farley Nuclear Plant 1&2 Marked-up TS Pages 2.1 System Design and Operation 3. Farley Nuclear Plant 1&2 Revised TS Pages 2.2 Current Technical Specifications Requirements 4. Vogtle Electrical Generating Plant 1&2 Marked-up TS 2.3 Reason for the Proposed Change Pages 2.4 Description of the Proposed Change 5. Vogtle Electrical Generating Plant 1&2 Revised TS Pages

6. Farley Nuclear Plant 1&2 Marked-up TS Bases Pages

3. TECHNICAL EVALUATION (Information only)

7. Vogtle Electrical Generating Plant 1&2 Marked-up TS

4. REGULATORY EVALUATION Bases Pages (Information only) 4.1 Applicable Regulatory Requirements/Criteria 4.2 Precedent 4.3 No Significant Hazards Consideration Analysis 4.4 Conclusions

5. ENVIRONMENTAL CONSIDERATION

6. REFERENCES 9

Enclosure Section 2: Detailed Description 2.1 System Description and Operation

• Describes MIDS

• Describes PDMS

• Supporting topical report WCAP-12472-P originally approved in 1994

• Discusses three BEACON monitoring levels: BEACON-OLM (on-line monitor),

BEACON-TSM, BEACON-DMM (direct margin monitor)

• SNC proposes to license use of BEACON-TSM level

• Functionality requirements for PDMS will be located in the Technical Requirements Manual (TRM) 2.2 Current Technical Specifications Requirements 2.3 Reason for the Proposed Change 2.4 Description of the Proposed Change 10

Enclosure Section 3: Technical Evaluation

• Provides high level overview on WCAP-12472-P "BEACON Core Monitoring and Operations Support System"

• Discusses temperature and neutron monitoring used to generate power distribution

• SPNOVA 3-D neutronics analysis code originally used in BEACON

• Discusses minimum monitoring requirements per WCAP

• Discusses how the conditions from the WCAP SER will be met:

• NRC has approved four addenda to WCAP-12472-P

• Discusses each addendum, and the applicability to Farley and Vogtle 11

Evaluation for Excluding BEACON Power Distribution Monitoring System (PDMS) Requirements from the Technical Specifications

• Demonstrates that BEACON PDMS does not meet the § 50.36(c)(2)(ii) criteria for inclusion into TS

• Follows precedent in previously approved LARs

• Dispositions each of the four criteria 12