ML22236A020

Initial License Exam Forms ES-D1

ML22236A020
Person / Time
Site:	Dresden
Issue date:	05/14/2021
From:	Chuck Zoia NRC/RGN-III/DRS/OLB
To:	Exelon Generation Co
Zoia C
Shared Package
ML20136A310	List: ML22235A756 ML22235A757 ML22236A016 ML22236A017 ML22236A018 ML22236A020
References
Download: ML22236A020 (3)

Text

Scenario Outline Facility: Dresden Generating Station Scenario No.: 2021-301 ILT-N-2 Op-Test No.: 2021-301 Examiners Operators / crew position

/ ATC

/ BOP

/ CRS Initial Conditions: Unit 2 is at 85% Power.

Site is under a high winds advisory due to inclement weather.

Turnover: A Condensate/Condensate Booster Pump is experiencing high vibrations and needs to be removed from service for maintenance once power is lowered to 82% per DGP 03-01, Power Changes, step G.4.

Critical Tasks: 1. If the RPV level trend is not reversible with an RPV injection source lined up with a pump running, initiate emergency depressurization by opening 5 ADSVs with RPV water level between the Top-of-Active Fuel and the Minimum Steam Cooling RPV Water Level or within 2 1/2 minutes after TAF is reached, whichever is later.

2. Per DEOP 100, RPV Control, with automatic ADS timer initiated, inhibit ADS before an automatic actuation occurs.

Event Malf. Event Event No. No. Type* Description #

1 NONE R ATC Lower Power with flow 2 NONE N BOP Secure RFP and C/CB Pump 3 HPRMBRKP C/T BOP / CRS HPCI Isolation due to Steam Leak 4 RDPPBTRP C/T ATC / CRS CRD Pump Trip 5 CSP501B C/T BOP / CRS Core Spray System Low Pressure 6 X10 C ATC RFP Vent Fan Trip 7 F41 M Team Recirc Leak in DW - Manual Scram CS2AFTC 8 C BOP Core Spray Pump Fails to Auto Start CSLAUPPA RLMRASP 9 M Team Loss of Feed - Emergency Depressurization on Level RLMRBSP

• (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor, (T)ech Spec

1. (New) - Event not used on previous 2 NRC Exams, (Pre) - Event used on previous 2 NRC Exams

Scenario Outline Facility: Dresden Generating Station Scenario No.: 2021-301 ILT-N-3 Op-Test No.: 2021-301 Examiners Operators / crew position

/ ATC

/ BOP

/ CRS Initial Conditions: Unit 2 is at 72% Power.

U2 Isolation Condenser is OOS for 2-1301-3 valve motor replacement.

Turnover: During initial power ascension following a refuel outage, 345kV Bus Tie 4-5 CB tripped. Repairs have been completed and the 345kV Switchyard is ready to be returned to a normal lineup. Once restored, continue on with power ascension to raise reactor power to 90% using recirc flow per QNE guidance.

Critical Tasks: 1. With reactor scram required and reactor not shutdown, act per DEOP 400-5, Failure to Scram, to reduce power by inserting negative reactivity before Torus temperature reaches 110oF.

2. Once DEOP 400-5, Failure to Scram, is entered -AND- reactor power is > 6% -AND- reactor level is > the Top-of-Active Fuel - AND- drywell pressure is > 2 psig or an ERV is open -AND- torus temperature is > 110o F, terminate and prevent injection (with exception of SBLC and CRD) into the RPV prior to exceeding Heat Capacity Temperature Limit (HCTL).

Event Malf. Event Event No. No. Type* Description #

1 NONE N BOP Restore 345kV Bus Tie 4-5 Circuit Breaker 2 NONE R ATC Raise Reactor Power using Recirc Flow 3 RR02A C/T ATC / CRS Recirc Pump Speed Controller Failure RADRBVAH VGDSTBYA 4 C/T BOP / CRS RB Vent Rad Monitor Fails Upscale, SBGT Fails to Auto Start VGDPRIMA VGDSTRTA 5 T50 C BOP Stator Water Cooling Pump Trip 6 CIGP1I M Team Spurious Group 1 - SCRAM RDHLVFPA RDHLDEGA 7 M Team Hydraulic ATWS RDHLVFPB RDHLDEGB SCRLFVAD 8 C ATC SBLC Relief Valve Fails Open SCRLFVBD

• (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor, (T)ech Spec

1. (New) - Event not used on previous 2 NRC Exams, (Pre) - Event used on previous 2 NRC Exams

Scenario Outline Facility: Dresden Generating Station Scenario No.: 2021-301 ILT-N-4 Op-Test No.: 2021-301 Examiners Operators / crew position

/ ATC

/ BOP

/ CRS Initial Conditions: Unit 2 is in Mode 2. Reactor Power is stable at 7%

Turnover: Per DGP 01-01, Unit Startup, step G.57, stop rejecting to the Condenser with RWCU. Once complete, continue raising power to 10% per DGP 01-01 in preparation to put the Mode Switch in RUN.

Critical Tasks: 1. When RPV water level cannot be determined by multiple direct or indirect indications as defined by DEOP 0010-10, exit DEOP 100 and enter DEOP 400-1, RPV Flooding before DW radiation levels exceed 100 R/hr.

2. When conditions are met per DEOP 400-1, RPV Flooding, the minimum number (2 ADSVs) of available ADSVs for RPV depressurization are opened before DW radiation levels exceed 100 R/hr to allow RPV injection with high capacity, low pressure sources (Condensate/Feedwater, LPCI and/or CS).

3. Following RPV depressurization during non-ATWS RPV Flooding, and before DW radiation levels exceed 100 R/hr, maximize injection with high capacity, low pressure sources (Condensate/Feedwater, LPCI and/or CS) and do not divert available RPV injection flow paths until the RPV is flooded to the Main Steam Lines.

Event Malf. Event Event No. No. Type* Description #

1 NONE N BOP Secure Rejecting to Condenser with RWCU 2 NONE R ATC Raise Power with Rods 3 ADS3ESD C/T BOP / CRS ERV Spurious Open WTPPDSH1 4 HWWTPPDSH(1) C BOP Degraded TBCCW Pump HWWTBPMP(1)

NII17POT 5 I/T ATC / CRS IRM Fails Upscale - Partial Half Scram B15 6 NVM100BP M TEAM Medium Range Level Reference Leg Leak, Rise in DW Press - Scram 7 B12 C ATC Electrical ATWS NVM100AP NVM129AP 8 M TEAM Loss of Level Indication - RPV Flooding NVM106AP/BP NVML112P

• (N)ormal, (R)eactivity, (I)nstrument, (C)omponent, (M)ajor, (T)ech Spec

1. (New) - Event not used on previous 2 NRC Exams, (Pre) - Event used on previous 2 NRC Exams