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

Septem ber 27, 2023 Age nda

• B a c kgr o und

• Solution

• TS Section 3.1 & 3.2 Rebaseline

• L A R S c he dule

• S u mma r y

• Questions/Comments?

2 Ba c k gr ound

• 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-1 431 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.

3 Solution To r educe t he backlog of unadopt ed TSTF t r aveler s, TVA pr oposes a st r at egy t o r ebaseline discr et e sect ions of t he TS:

• M ult iple t r aveler s af f ect ing common sect ions of t he TS w ill be included in a bundled License Amendment Request ( LAR).

• Each t r aveler w ill have it s ow n sect ion in t he LAR w it h ident ical subsect ions.

• TS mar kups w ill be color coded f or t he ef f ect s of each t r aveler.

• TVA w ill assess t he success of t his appr oach w it h t he pilot LAR and make adjust ment s as needed f or f ut ur e r ebaseline LARs.

4 TS Se c tion The pilot LAR f or t his appr oach w ill be t he r ebaseline of TS 3.1 & 3.2 Sect ions 3. 1 and 3. 2, and w ill adopt t w elve t r aveler s:

Rebaseline

• TSTF-5-A, Revision 1, Delet e Saf et y Limit Violat ion Not if icat ion Requirement s

• TSTF-9- A, Revision 1, Relocat e value f or shut dow n mar gin t o CO L R

• TSTF-12-A, Revision 1, Delet e LCO 3. 1. 9 and 3. 1. 11

( Physics Test s Except ions)

• TSTF-13-A, Revision 1, M ove SR f or 300 ppm M TC measur ement t o Fr equency Not e of SR 3. 1. 4. 3

• TSTF-14-A, Revision 4, Add an LCO it em and SR t o M ode 2 Physics Test s Except ions t o ver if y t hat Ther mal Pow er < =

5 % R T P.

5 TS Se c tion

• TSTF-11 0-A, Revision 2, Delet e SR Fr equencies Based on 3.1 & 3.2 I noper able Alar ms Rebaseline

• TSTF-135-A, Revision 3, RPS and ESFAS I ns t r um e nt a t i o n (c ontinue d)

• TSTF-136-A, Combine LCO 3. 1. 1 and 3. 1. 2

• TSTF-142-A, I ncr ease t he Complet ion Time When t he Cor e Reac t ivit y Balanc e is Not W it hin Limit

• TSTF-241-A, Revision 4, Allow Time f or St abilizat ion Af t er Reducing Pow er Due t o Q PTR O ut-of -Limit

• TSTF-256-A, M odif y M O DE 2 STE Applic abilit y

• TSTF-339-A, Revision 2, Relocat e TS Par amet er s t o CO LR

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 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.

APPLICABILITY: MODE 2 during PHYSICS TESTS.

ACTIONS 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 PHYSICS TESTS EXCEPTIONS - MODE 2 3.1.10

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 COMPLETIONTIME

A. SDM not within limit. A.1 Initiate boration to restore SDM 15 minutes 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 notB.1 Open reactor trip breakers. Immediately within limit.

(continued)

Watts Bar-Unit 1 3.1-21 Amendment 28, TS Se c tion Subsect ions f or each t r aveler :

3.1 & 3.2

• Descr ipt ion of Pr oposed Change Rebaseline

• Dif f er ences Bet w een t he Pr oposed Change and t he (c ontinue d) Appr oved Tr aveler

• Summar y of t he Appr oved Tr aveler Just if icat ion

• Dif f er ences Bet w een t he Plant-Specif ic Just if icat ion and t he Appr oved Tr aveler Just if icat ion

• NRC Appr oval

• List of Af f ect ed Pages

• Regulat or y Analysis

7 TS Se c tion LAR w ill af f ec t t he f ollow ing TS:

3.1 & 3.2

• TS 2. 1 Saf et y Limit s Rebaseline

• TS 2. 2 Saf et y Limit Violat ions (c ontinue d)

• LCO 3. 0. 7

• TS 3. 1. 1 Shut dow n M ar gin - Ta v g > 200°F

• TS 3. 1. 2 Shut dow n M ar gin - Ta v g 200°F

• TS 3. 1. 3 Cor e React ivit y

• TS 3. 1. 4 M oder at or Temper at ur e Coef f icient

• TS 3. 1. 5 G r oup Rod Alignment Limit s

• TS 3. 1. 7 Cont r ol Bank I nser t ion Limit s

8 TS Se c tion 3.1 & 3.2

• TS 3. 1. 9 Physics Test s Except ions - M O DE 1 Rebaseline

• TS 3. 1. 10 Physics Test s Except ions - M ode 2 (c ontinue d)

• TS 3. 2. 3 Axial Flux Dif f erence

• TS 3. 2. 4 Q uadr ant Pow er Tilt Rat io

• TS 3. 3. 1 React or Tr ip Syst em I nst r ument at ion

• TS 3. 3. 2 ESFAS I nst r ument at ion

• TS 3. 4. 1 RCS Pr essur e, Temper at ur e, and Flow Depar t ur e f rom Nucleat e Boiling Limit s

• TS 5. 9. 5 Cor e O per at ing Limit s Repor t

9 LAR

• P roj ec ted s ubm i ttal by m i ddl e of Novem ber 2023 w i th a reques ted approval w i thi n one year Sc he dule

• A 180- day i m pl em entati on peri od i s propos ed

10 S umma r y

• TVA plans t o submit bundled TSTF t r aveler LARs t hat f ocus on specif ic TS sect ions t o r educe t he backlog of unadopt ed t r aveler s f or Wat t s Bar

• T he pilot LAR Rebaselines TS Sect ions 3. 1 & 3. 2 w it h adopt ion of t w elve t r aveler s

• Submit t al planned f or t he middle of November 2023, w it h o ne-year NRC r eview, and 180- day implement at ion per iod

• TVA w ill assess t he success of t he pilot f or f ut ur e bundled t r aveler submit t als of t his t ype

11 Que s tions /

C omme nt s ???

12