ML22083A107
| 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 March 30, 2022
( ~ DUKE
~ 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) 2 2
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 4
4 3.8. 1 AC Sources - Operating LCO 3.8.1 The following AC electrical sources shall be OPERABLE:
- a.
Two qualified circuits between the offsite transmission network and the onsite emergency AC Electrical Power Distribution System; and
- b.
Two diesel generators (DGs) capable of supplying the onsite emergency power distribution subsystem(s).
APPLICABILITY:
MODES 1, 2, 3, and 4.
SR 3.8. 1.16
NOTE------------------------------------
- 1. This Surveillance shall not be performed in MODE 1or2.
~
- 2. SR 3.8.1.16 is not required to be met if 1.160 IN b1,Js 2 OAS 480 V Emergency Bus 1 power supply is
____ from a start up transformer. ~
low er case "b" I Verify automatic transfer capability of the 1.160 It'/ b1,Js 2 OAS 11:le 480 V Emergency bus 1 loads from the Unit auxiliary transformer to a start up transformer.
In accordance with the Surveillance Frequency Control Program
System Design and Operation 5
5 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
6 6
100% Power W-EST \\Li:ik V ------
EAST 11 kV OA:TH 230,c '-,}------
S'W-lCFR-SST-SH-2J OFFO
( ~
SWITCHGEAR BUlLDING 46G
-* ADS
-i----,.,i~0~5 17~
-'.JS.k V BUS 10 11..,k\\l STAllTUP TFI NSf Or.lMEFI 7
HV-27/36/ 45/50.4 MVA
~-0 L Y-13.5 / 18/22.5/25.2 t-1VA CEAC H>
2<1-D!SC-Sw-Y-SUT-115
) 52 I IBB 9!0v EMERGE CY 6~
! )52 J;l?B EMERGENCY DIESEL GE ERATOR A 3125 KVA. 3 a 60HZ DA.9:LINGTO COUNT Y ORTH LC E 2'30 k 'V 2j0:i!: 'i STAR TUP' TFlttl'ISFORME~
H'i-2'7/36/ 45/ 50. "1 MVA L V-l':'.l.'5/18/22.5 /25.2' MYA (EACHJ GEN. DISC.
52 !)
22B N.O.
6)52
'j 3ZB 52 32 SST 20 WJJ OEDIC.OTEO SHUTDOWN IG TRANSFORMER 0
52 DIESEL 298 UENERAT OR 32'50 K'iA. 4160V, 30. 60HZ LINK.
52 2B8 DARLINGTON SCP'S~ LINE 2'30k V t-1AI TRANSF GH. ER BANK 3-330 MVA lPH. 60HZ UNIT AUXILIAR't TRANS FORMER # 2 HIJ44 /.C9.2 MVA L \\1 - 22/24.6 MVA <EAC H) t*
EMERGENCY []IE5 EL GENERATOR B 31 25 K\\I A. 30. 60Hl
Reason for the Proposed Change 7
7 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. This Surveillance shall not be performed in MODE 1 or 2.
- 2. SR 3.8.1.16 is not required to be met if 4.160 kV bus 2 and 480 V Emergency Bus 1 power supply is from a start up transformer.
=
Background===
8 8
Amendment 176 (improved Standard TS) added SR 3.8.1.16 Prior to Amendment 261:
)
480V EIIIERCENCY BUS El EMERG. DIESEL GEN. A N.0.
Unit AUXIiiary Transformer
~
OS TRANS OS DtESEL GEN.
N.O.
)
~
CEH. DISC..,l EMERG. DlESEL GEN. B LJN~
~
Ml.IN GEN. 2 22kV, 896,9 WA
Justification 9
9 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
Schedule 10 10 Submit LAR by April 28, 2022 Implementation within 120 days of receipt of safety evaluation
11