ML20078M279
| ML20078M279 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 02/27/2020 |
| From: | Gregory Roach NRC/RGN-III/DRS/OLB |
| To: | FirstEnergy Nuclear Operating Co |
| Roach G | |
| Shared Package | |
| ML19121A160 | List: |
| References | |
| Download: ML20078M279 (3) | |
Text
Appendix D Scenario Outline Form ES-D-1 Facility:
Davis-Besse Scenario No.:
3 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions: 100% Power Turnover: SFAS Ch 2 RCS Pressure LO and LOLO Bistables have been tripped due to an instrument failure last shift.
Planned:
Stop #1 HDP for maintenance I&C to repair failed instrument and restore to service Critical tasks:
- 1. Isolate overcooling SG (CT-17)
- 2. Restore Seal Return or Shutdown the Reactor Coolant Pumps (CT-B)
Event No.
Malf.
No.
Event Type*
Event Description 1
N-BOP/SRO Stop #1 Heater Drain Pump for maintenance 2
C-ATC/SRO Makeup Filter High diff press 3
TS-SRO Containment Spray Pump Oil Leak (TS) 4 R-ATC/SRO C-BOP TS-SRO RCP 1-1 high vibrations - reduce power - trip RCP (TS) 5 C-BOP/SRO FW auto re-ratio fails when trip RCP 6
C-ATC/SRO Inadvertent SFAS Levels 1 through 3 - Trip reactor 7
Major OVCLG - Leaking Main Steam Safety Valve 8
C-BOP/SRO SFRCS fails to auto initiate on Low Steam Pressure (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor
Appendix D Scenario Outline Form ES-D-1 Facility:
Davis-Besse Scenario No.:
4 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions: 100% Power Turnover: Maintain 100% Power Planned: Place cooling tower makeup (CTMU) pump 2 in service and stop CTMU pump 1.
Critical tasks:
- 1. Shutdown the Reactor - ATWS (CT-24)
- 2. Control HPI (CT-5)
Event No.
Malf.
No.
Event Type*
Event Description 1
N-BOP/SRO Swap Cooling Tower Makeup Pumps 2
TS-SRO RC TE3A6 Hot Leg temp to SCM meter (TS) 3 C-ATC/SRO MU32 fails closed (use alt inj line) 4 C-BOP/SRO TS-SRO Startup Transformer 02 Lockout (TS) 5 C-BOP/SRO MFP low oil pressure - trip MFP - runback works 6
R-ATC/SRO C-BOP SG Tube Rupture 7
Major ATWS - Key Switch Works 8
C-ATC/SRO PZR Spray valve fails closed (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor
Appendix D Scenario Outline Form ES-D-1 Facility:
Davis-Besse Scenario No.:
5 Op Test No.:
Operators:
SRO ATC BOP Initial Conditions: 100% Power Turnover: Maintain 100% Power Planned: Routine activities Critical tasks:
- 1. Isolate Overcooling SG (CT-17)
- 2. FW Flow Control (CT-16)
- 3. Control RCS Inventory (CT-30)
Event No.
Malf.
No.
Event Type*
Event Description 1
R-ATC/SRO TS-SRO D2 Lockout - Power reduction (TS) 2 C-BOP/SRO SAC 2 trip (SAC 1 and EIAC Auto start fail) 3 I-ATC/SRO Power range (NI5) high failure 4
I-BOP/SRO TS-SRO Place RPS Channel 2 in Manual Bypass (TS) 5 C-ATC/SRO Turbine Vibration - trip Rx 6
Major/ALL OVCLG - MSR 2ND STG FAIL 7
C-BOP/SRO AFP Target rock fails open - SG overfeed 8
C-ATC/SRO MUP Trip - Loss of Both MUPs (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor