ML22083A107

Presubmittal Licensee Presentation for SR 3.8.1.16 Proposed License Amendment Request (EPID L-2022-LRM-0021) (Slides)

ML22083A107
Person / Time
Site:	Robinson
Issue date:	03/30/2022
From:	Duke Energy Progress
To:	Tanya Hood NRC/NRR/DORL/LPL2-2
Hood T
References
EPID L-2022-LRM-0021
Download: ML22083A107 (11)

Text

Robinson / NRC Pre-submittal Meeting:

LAR to Remove 4.160 kV bus 2 from Surveillance Requirement 3.8.1.16 ( ~ DUKE March 30, 2022 ~ ENERGY Duke Energy Attendees

Lee Grzeck (Manager, Nuclear Fleet Licensing)

Joshua Duc (Nuclear Fleet Licensing)

Keith Beatty (RNP Engineering)

Alan Helms (RNP Engineering)

David Zybak (RNP Operations)

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Agenda

Current and Proposed Technical Specification (TS) / Surveillance Requirement (SR)

System Design and Operation Reason for the Proposed Change

Background

Justification Schedule

3 Current and Proposed TS / SR 3.8. 1 AC Sour c es - Ope rating

LCO 3.8.1 The fo llo w ing AC electrical sou rces shall b e OPERAB LE :

a. Tw o q u a lified c irc u its be tween the o ffsite tra n smission ne twor k and the onsi te em erg en c y AC Electrica l Po w er Distribut ion Sy stem ; and

b. Tw o d iesel gene rators (DGs) capa b le of su pplying the ons ite emergenc y po w er distrib u tion su bs y stem (s).

A P PLICAB ILI T Y : MOD ES 1, 2, 3, an d 4.

SR 3.8. 1.16 - -- ---- ---- ------ -------- NOT E----- --- ------- ---- ----- -- - ------ ---

1. Th is Sur veillan ce shall not b e perform ed in MO DE 1or2. ~

2. SR 3.8.1. 16 is no t req u ired to be me t if 1. 160 IN b 1,Js 2 OAS 480 V Emergenc y Bus 1 po w er supply is

_ __ _ from a s tart up transformer. ~ low er case "b" I

V erify a u tomatic transfer ca p ab ility of the 1.160 It'/ b1,Js In acco rdance w ith 2 OAS 11:le 4 8 0 V Eme rgenc y bus 1 loads from the U n it the Sur veillance au x iliar y transforme r to a sta rt u p tran sformer. Freq u en cy C on trol Progra m 4

4 System Design and Operation

TS 3.8.1 Bases Design of AC electrical power system ensures power to Engineered Safety Feature (ESF) systems Offsite circuit: equipment required to transmit power from offsite transmission network to ESF buses

Normal 100% power lineup from Startup Transformers (SUT), Unit Auxiliary Transformer (UAT):

115 kV SUT 4.160 kV bus 6 480 V Emergency bus 1 (ESF bus E1) 230 kV SUT 4.160 kV bus 9 480 V Emergency bus 2 (ESF bus E2)

UAT 4.160 kV bus 2

SR 3.8.1.16 automatic transfer from UAT to SUT Breakers 52/7 and 52/20 open; breakers 52/12 and 52/19 close

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W-E ST \\Li:ikV ------ ------- E AST 11 kV OA:TH 230,c '-,} ------DA.9:LI NGT O CO UN T Y DAR LI NGTON OR TH LC E 2'3 0 k 'V SCP'S~ LI NE 2'30 k V 100% Power

11..,k\\l S T AllT UP T FI NS f Or.lMEFI 2j0:i!: 'i ST AR T U P' T Flttl'ISF OR ME ~ t-1AI T RANSF GH. ER BAN K 7 HV - 2 7/36 / 45/50. 4 MV A H 'i-2'7/ 3 6 / 45 / 50. "1 M VA 3 - 330 MVA lPH. 60 H Z

~ -0 L Y-13. 5 / 18 /22.5/25. 2 t-1V A CEAC H> L V - l':'.l. '5 /1 8/22.5 /2 5. 2' MY A (E ACHJ

2<1 - D! S C-S wY - SU T-11 5

GEN. DI SC. UN IT AUXILI AR't T R ANS F ORM ER # 2 H IJ44 /.C9. 2 MV A LI NK. L \\1-22/24. 6 MVA <E AC H)

S'W - lCFR SS T-SH-2 J OFF O

S S T 20

( ~

BUlLDING 46G SWITCH G EAR

- ADS 52 32 6 )52 52 2B8

'j' ' 3ZB I I BB ) 52 WJJ OEDI C.OTE O SHU T DO WN

-i----,.,i~0~ 5 9!0v EME R GE CY 6 ~ I G T RANSF ORM ER

! ) 52 52 ! ) 0 5 2 22B N. O.

J; l?B U ENERAT OR DIESEL 298 17~ 32'5 0 K'iA. 4160V, 30. 60 H Z t* 6 6

EMER GE NCY DI E SEL E MERG E NC Y []IE 5 EL

-'. JS.k V BUS 10 3125 KV A. 3 a 60 HZ GE ERA T OR A 31 25 K\\IA. 3 0. 60 Hl GE NERA T OR B Reason for the Proposed Change

SR 3.8.1.16 requires auto transfer capability for both 4.160 kV bus 2 and 480 V Emergency bus 1

Amendment 261 added 230 kV SUT and four 4.160 kV buses Direct 4.160 kV feed to 480 V Emergency bus 1 changed from bus 2 to bus 6 480 V Emergency bus 1 can now be aligned to SUT when 4.160 kV bus 2 is not

Maintenance that prevents auto transfer of 4.160 kV bus 2 results in SR 3.8.1.16 not met 480 V Emergency bus 1 is aligned to offsite power, so there is no applicable TS 3.8.1 Condition SR 3.8.1.16 Note 2 does not alleviate this situation

SR 3.8.1.16 - -- -- -- --- --- -- --- ---- -- -NOTE- --- -- -------- -- --- -- -- -- --- --- -- ---

1. T his Su rveillance sha ll no t be performed in MOD E 1 or 2.

2. SR 3.8.1.16 is no t req u ired to be met if 4.160 kV bus 2 a nd 48 0 V Emergency Bu s 1 po w e r sup ply is from a s ta rt up transformer.

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Background

Amendment 176 (improved Standard TS) added SR 3.8.1.16 Prior to Amendment 261:

Unit AUXI iiary CEH. DI SC..,l ~

Tra n sformer LJN~ ~

22kV, 8 9 6,9 W A Ml.IN GEN. 2

) ~ OS TRAN S )

480V EIIIERC EN CY BUS El

N.0. OS DtESEL GEN. N.O.

8 EMERG. DI ES EL GEN. A EME RG. Dl ESEL GEN. B 8 Justification

TS 3.8.1 and associated Bases Required loads to consider offsite circuits operable are the ESF bus loads

Amendment 176 justification for adding SR 3.8.1.16:

added to verify the automatic transfer of the emergency bus E1 loads from the unit auxiliary transformer to the startup transformer.

Amendment 261 Direct 4.160 kV feed to 480 V Emergency bus 1 changed from 4.160 kV bus 2 to bus 6

Removal (vs. replacement) of the 4.160 kV bus better focuses SR 3.8.1.16 on the required ESF loads

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Schedule

Submit LAR by April 28, 2022

Implementation within 120 days of receipt of safety evaluation

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