ML21137A226
| ML21137A226 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/18/2021 |
| From: | Gregory Roach NRC/RGN-III/DRS/OLB |
| To: | FirstEnergy Nuclear Operating Co |
| Roach G | |
| Shared Package | |
| ML20136A251 | List: |
| References | |
| L-20-236 | |
| Download: ML21137A226 (2) | |
Text
Appendix D Scenario Outline Form ES-D-1 NUREG-1021, Revision 11 Page 1 of 21 Facility:
Davis-Besse Scenario No.:
1 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions:
Approximately 2% power
MDFP in service
MFP 2 running with no load on it, ICS control in HAND Turnover:
Plant was shut down to repair a small RCS Leak
Reactor Power currently at approximately 2%
Plant startup per DB-OP-06901, complete through Step 3.24
Mode 1 checklist is complete Planned:
Continue a plant startup per DB-OP-06901, starting at Step 3.25
Place MFP 2 in service and shutdown the MDFP
Raise Reactor power to 4% in preparation for Mode change Critical tasks:
1.
Trip All Reactor Coolant Pumps (CT-1) 2.
Initiate LPI and cross-tie injection lines (CT-4)
Event No.
Malf.
No.
Event Type*
Event Description 1
N-BOP/SRO Transfer from Motor Driven Feed Pump to MFP 2 2
R-ATC/SRO Raise power to 4%
3 C-BOP/SRO CAC 2 high bearing temperature (TS) 4 I-ATC/SRO PZR Level Temp Comp Inst Fails Low 5
C-BOP/SRO SW Pump Trip (TS), CT2955 fails to Auto Open 6
M-All Large Break LOCA/Reactor Trip/LSCM 7
C-ATC/SRO LPI pump 2 fail to start - cross connect LPI (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor
Appendix D Scenario Outline Form ES-D-1 NUREG-1021, Revision 11 Page 1 of 17 Facility:
Davis-Besse Scenario No.:
2 Op Test No.:
DB1LOT21 Examiners:
Operators:
SRO ATC BOP Initial Conditions:
93% Power
Reactor Power is at 93% power in preparation to stop #1 Condensate Pump Planned:
Stop Condensate Pump 1 for planned PMs Restore #1 EDG to service when maintenance is complete Critical tasks:
1.
Restore RCP Seal Return (CT-B) 2.
Electrical Power Alignment (CT-8)
Event No.
Malf.
No.
Event Type*
Event Description 1
N-BOP/SRO Stop Condensate Pump 1 2
I-ATC/BOP/SRO RCS Press NNI input fails low (TS) 3 C-BOP/SRO Circ Pump high stator temperature 4
C-ATC/SRO MU38, RCP Seal Return fails Closed (TS) 5 R-ATC/SRO Small RCS Leak (~275 gpm) into CTMT (TS) 6 M-ALL Loss of Offsite Power/Loss of SCM 7
C-ATC/BOP/SRO EDG 2 trips/HPI fails to Auto start (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor