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.: DB NRC 2020 Examiners: 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 Malf. Event Type* Event No. No. 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)
R-ATC/SRO 4 C-BOP RCP 1-1 high vibrations - reduce power - trip RCP (TS)
TS-SRO 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.: DB NRC 2020 Examiners: 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 Malf. Event Type* Event No. No. 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)
C-BOP/SRO 4 Startup Transformer 02 Lockout (TS)
TS-SRO 5 C-BOP/SRO MFP low oil pressure - trip MFP - runback works R-ATC/SRO 6 SG Tube Rupture C-BOP 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.: DB NRC 2020 Examiners: 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 Malf. Event Type* Event No. No. Description R-ATC/SRO 1 D2 Lockout - Power reduction (TS)
TS-SRO 2 C-BOP/SRO SAC 2 trip (SAC 1 and EIAC Auto start fail) 3 I-ATC/SRO Power range (NI5) high failure I-BOP/SRO 4 Place RPS Channel 2 in Manual Bypass (TS)
TS-SRO 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