ML23264A041

NRC Pre-Submittal Meeting WBN Rebaseline LAR, TVA Presentation Slides

ML23264A041
Person / Time
Site:	Watts Bar
Issue date:	09/27/2023
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
Green K
References
Download: ML23264A041 (15)

Text

License Amendment Request Rebaseline Watts Bar Technical Specifications Sections 3.1 and 3.2 September 27, 2023

Agenda

• Background

• Solution

• TS Section 3.1 & 3.2 Rebaseline

• LAR Schedule

• Summary

• Questions/Comments?

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Background===

• Watts Bar Unit 1 received its Operating License on 2/7/1996.

• Watts Bar Unit 2 received its Operating License on 10/22/2015

• Both unit Technical Specifications (TS) are based on NUREG-1431 Revision 0, issued on 9/28/1992

• Few TSTF travelers were adopted for Unit 1 to maintain TS consistency with eventual licensing of Unit 2.

• Current backlog of unadopted TSTF travelers is approximately 90.

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Solution To reduce the backlog of unadopted TSTF travelers, TVA proposes a strategy to rebaseline discrete sections of the TS:

Multiple travelers affecting common sections of the TS will be included in a bundled License Amendment Request (LAR).

Each traveler will have its own section in the LAR with identical subsections.

TS markups will be color coded for the effects of each traveler.

TVA will assess the success of this approach with the pilot LAR and make adjustments as needed for future rebaseline LARs.

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TS Section 3.1 & 3.2 Rebaseline The pilot LAR for this approach will be the rebaseline of TS Sections 3.1 and 3.2, and will adopt twelve travelers:

TSTF-5-A, Revision 1, Delete Safety Limit Violation Notification Requirements TSTF-9-A, Revision 1, Relocate value for shutdown margin to COLR TSTF-12-A, Revision 1, Delete LCO 3.1.9 and 3.1.11 (Physics Tests Exceptions)

TSTF-13-A, Revision 1, Move SR for 300 ppm MTC measurement to Frequency Note of SR 3.1.4.3 TSTF-14-A, Revision 4, Add an LCO item and SR to Mode 2 Physics Tests Exceptions to verify that Thermal Power <=

5% RTP.

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TS Section 3.1 & 3.2 Rebaseline (continued)

TSTF-110-A, Revision 2, Delete SR Frequencies Based on Inoperable Alarms TSTF-135-A, Revision 3, RPS and ESFAS Instrumentation TSTF-136-A, Combine LCO 3.1.1 and 3.1.2 TSTF-142-A, Increase the Completion Time When the Core Reactivity Balance is Not Within Limit TSTF-241-A, Revision 4, Allow Time for Stabilization After Reducing Power Due to QPTR Out-of-Limit TSTF-256-A, Modify MODE 2 STE Applicability TSTF-339-A, Revision 2, Relocate TS Parameters to COLR 6

PHYSICS TESTS EXCEPTIONS -

MODE 2

3. 1. 10 3.1 REACTIVITY CONTROL SYSTEMS 3.1.10 PHYSICS TESTS Exceptions-MODE 2 LCO 3.1.10 APPLICABILITY:

ACTIONS During the performance of PHYSICS TESTS, the requirements of LCO 3.1.4, "Moderator Temperature Coefficient (MTC)";

LCO 3.1.5, "Rod Group Alignment Limits";

LCO 3. 1. 6, "Shutdown Bank Insertion Limits";

LCO 3.1.7, "Control Bank Insertion Limits"; and LCO 3.4.2, "RCS Minimum Temperature for Criticality" may be suspended, and the number of required channels for LCO 3.3.1, "RTS Instrumentation," Functions 2, 3, 6, and 16.e, may be reduced to "3" required channels provided:

a.

RCS lowest loop average temperature is~ 541°F; and

b.

SDM is~ 1.6% 6k/k.

MODE 2 during PHYSICS TESTS.

CONDITION REQUIRED ACTION COMPLETION TIME A.

SOM not within A.1 Initiate boration to 15 minutes limit.

restore SOM to within limit.

AND A.2 Suspend PHYSICS TESTS 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> exceptions.

B.

THERMAL POWER not 8.1 Open reactor trip Immediately within limit.

breakers.

(continued)

Watts Bar-Unit 1 3.1-23 Amendment No. 28 SEP 1 3 2000 DRAFT within the limits specified in the COLR; and

c. THERMAL POWER is 5% RTP.

D initiated in MODE 2 Red - TSTF-9 Green = TSTF-12 Orange = TSTF-14 Black = TSTF-256 21

PHYSICS TESTS EXCEPTIONS - MODE 2 3.1.10 Watts Bar-Unit 1 3.1-21 Amendment 28, 3.1 REACTIVITY CONTROL SYSTEMS 3.1.10 PHYSICS TESTS ExceptionsMODE 2 LCO 3.1.10 During the performance of PHYSICS TESTS, the requirements of LCO 3.1.4, "Moderator Temperature Coefficient (MTC)";

LCO 3.1.5, "Rod Group Alignment Limits";

LCO 3.1.6, "Shutdown Bank Insertion Limits";

LCO 3.1.7, "Control Bank Insertion Limits"; and LCO 3.4.2, "RCS Minimum Temperature for Criticality" may be suspended, and the number of required channels for LCO 3.3.1, RTS Instrumentation, Functions 2, 3, 6, and 16.e, may be reduced to 3 required channels provided:

a.

RCS lowest loop average temperature is 541F; b.

SDM is within the limits specified in the COLR; and

c.

THERMAL POWER is 5% RTP.

APPLICABILITY:

During PHYSICS TESTS initiated in MODE 2.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A.

SDM not within limit.

A.1 Initiate boration to restore SDM to within limit.

AND A.2 Suspend PHYSICS TESTS exceptions.

15 minutes 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> B.

THERMAL POWER not within limit.

B.1 Open reactor trip breakers.

Immediately (continued)

DRAFT

TS Section 3.1 & 3.2 Rebaseline (continued)

Subsections for each traveler:

Description of Proposed Change Differences Between the Proposed Change and the Approved Traveler Summary of the Approved Traveler Justification Differences Between the Plant-Specific Justification and the Approved Traveler Justification NRC Approval List of Affected Pages Regulatory Analysis 7

TS Section 3.1 & 3.2 Rebaseline (continued)

LAR will affect the following TS:

TS 2.1 Safety Limits TS 2.2 Safety Limit Violations LCO 3.0.7 TS 3.1.1 Shutdown Margin - Tavg >200°F TS 3.1.2 Shutdown Margin - Tavg 200°F TS 3.1.3 Core Reactivity TS 3.1.4 Moderator Temperature Coefficient TS 3.1.5 Group Rod Alignment Limits TS 3.1.7 Control Bank Insertion Limits 8

TS Section 3.1 & 3.2 Rebaseline (continued)

TS 3.1.9 Physics Tests Exceptions - MODE 1 TS 3.1.10 Physics Tests Exceptions - Mode 2 TS 3.2.3 Axial Flux Difference TS 3.2.4 Quadrant Power Tilt Ratio TS 3.3.1 Reactor Trip System Instrumentation TS 3.3.2 ESFAS Instrumentation TS 3.4.1 RCS Pressure, Temperature, and Flow Departure from Nucleate Boiling Limits TS 5.9.5 Core Operating Limits Report 9

LAR Schedule

• Projected submittal by middle of November 2023 with a requested approval within one year

• A 180-day implementation period is proposed 10

Summary TVA plans to submit bundled TSTF traveler LARs that focus on specific TS sections to reduce the backlog of unadopted travelers for Watts Bar The pilot LAR Rebaselines TS Sections 3.1 & 3.2 with adoption of twelve travelers Submittal planned for the middle of November 2023, with one-year NRC review, and 180-day implementation period TVA will assess the success of the pilot for future bundled traveler submittals of this type 11

Questions/

Comments

???

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