ML22115A157
| ML22115A157 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/24/2022 |
| From: | Chuck Zoia NRC/RGN-III/DRS/OLB |
| To: | FirstEnergy Nuclear Operating Co |
| Zoia C | |
| Shared Package | |
| ML20140A252 | List: |
| References | |
| Download: ML22115A157 (3) | |
Text
Appendix D Scenario Outline Form ES-D-1 NUREG-1021, Revision 11 Page 1 of 22 Facility:
Davis-Besse Scenario No.
1 Op Test No.:
DB1LOT22 Examiners:
Operators:
SRO ATC BOP Initial Conditions: 100% Power Turnover: Maintain 100% Power Planned: Shift Routines Critical tasks:
- 1. Close the Pressurizer Spray Valve and PORV Block Valve
- 2. Restore RCP Seal Return Event No.
Malf.
No.
Event Type*
Event Description 1
(N) ATC Place Purification Demin 3 I/S per Chemistry request 2
(I) ATC Leaking Power Operated Relief Valve (PORV) (TS) 3 (C) BOP Trip TPCW Pump 1 Hi Bearing Temp / Start STBY pump 4
Inverter YV1 DC input failure (TS) 5 (R) ATC/(C) BOP TPCW Pump 2 trips / Lower power to capacity of 1 pump 6
Major Steam Leak in CTMT / Trip Reactor 7
(C) BOP AFP 1 Trips - Start the MDFP (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 20 Facility:
Davis-Besse Scenario No.:
2 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions: 100% Power Turnover: Maintain 100% Power Planned: Shift routines Critical tasks:
- 1. Shutdown Reactor - ATWS
- 2. Isolate Overcooling Steam Generators Event No.
Malf.
No.
Event Type*
Event Description 1
(C) ATC Weekly Run of the Standby Makeup Pump 2 Oil Pumps (TRM) 2 (C) BOP Main Feedwater Pump Turbine 1 High Drain Tank Level 3
(C) BOP Swap SFP Pumps due to high bearing temp/vibration 4
(R) ATC / BOP Dropped Control Rod - Reduce Reactor Power (TS) 5 Major Main Generator Lockout - ATWS 6
(C) BOP Stuck Open Main Steam Safety Valve - Overcooling 7
(C) BOP Steam Feed Rupture Control System fails to automatically align for a low pressure trip on Steam Generator 1 (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 18 Facility:
Davis-Besse Scenario No.:
3 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions: 60% Power Turnover: Shutdown Main Feedwater Pump1 to 1000 RPM Auxiliary Feedwater Pump 1 Out of Service Planned: Complete the Shutdown of Main Feedwater Pump 1 Critical tasks:
- 1. Trip all 4 RCPs
- 2. Initiate High Pressure Injection Cooling Event No.
Malf.
No.
Event Type*
Event Description 1
(N) BOP Remove Main Feedwater Pump 1 from service 2
(C) ATC / BOP Component Cooling Water Pump 2 Trips (TS) 3 Bus F7 Failure / Motor Driven Feedwater Pump Inop (TS) 4 (C) BOP Station Air Compressor 2 setpoint failure - Low air header pressure 5
(R) ATC (C) BOP Rising Main Condenser Pressure - Reduce Reactor Power Trip the Main Generator 6
Major Trip the Reactor - Initiate / Isolate Steam Feedwater Rupture Control system 7
(C) ATC/BOP Auxiliary Feedwater Pump 2 Trips - Emergency Feedwater Pump does not start - Loss of All Feedwater Standby Makeup Pumps fails to start - Makeup / High Pressure Injection / PORV Cooling (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor