ML22073A117

2021 Final Written Exam Original Modified Questions

ML22073A117
Person / Time
Site:	Calvert Cliffs
Issue date:	06/21/2021
From:	NRC Region 1
To:	Exelon Generation Co
Shared Package
ML20261H327	List: ML21187A307 ML21187A308 ML21187A309 ML21187A310 ML21189A288 ML21193A298 ML21193A307 ML21193A312 ML21193A316 ML21193A321 ML21193A369 ML21202A164 ML22073A117
References
EPID L-2021-OLL-0028
Download: ML22073A117 (4)

Text

Exam Material Loss of condenser v... Question Preview Original Question #22 ID: 1450967 Points: 1.00 Given the following conditions on Unit 1:

Reactor power is 7% power The turbine is being rolled for a start up The condenser has developed a small vacuum leak Condenser pressure is 26.7 inches of Hg. and slowly lowering The crew has entered AOP-7G, LOSS OF CONDENSER VACUUM What is: 1) the MINIMUM backpressure setpoint at which the Turbine Bypass Valves becomes unavailable, and 2) what does this setpoint protect?

A. 1) 20 inches Hg.

2) Low pressure turbine blades from stationary diaphragm rubbing B. 1) 20 inches Hg.

2) Main condenser from overpressure C. 1) 22.5 inches Hg.

2) Main condenser from overpressure D. 1) 22.5 inches Hg.

2) Low pressure turbine blades from stationary diaphragm rubbing Answer C Answer Explanation A. INCORRECT - 1) Plausible since the setpoint is for the SGFP trip and the basis document states that feed flow will be lost when TBV pressure setpoint is reached, however the setpoint is 22.5 inches Hg. 2) Plausible since the LP turbine blades are sensitive to back pressure and stationary diaphragm rubbing, however the basis document stipulates that condenser overpressure is the reason the TBV permissive is lost.

B. INCORRECT - 1) Plausible since the setpoint is for the SGFP trip and the basis document states that feed flow will be lost when TBV pressure setpoint is reached, however the setpoint is 22.5 inches Hg. 2) Correct reason per basis document C. CORRECT - Basis Document NOTE 4 provides this information D. INCORRECT - 1) Correct TBV setpoint 2) Plausible since the LP turbine blades are sensitive to back pressure and stationary diaphragm rubbing, however the basis document stipulates that condenser overpressure is the reason the TBV permissive is lost.

Question ID: 1450967 02/09/2021 2 of 3

Exam Material Loss of condenser v... Question Preview Question Information Topic L97703 St. Lucie 2001 RO Exam: Loss of condenser vacuum and AOP User ID Q97703 System ID 1450967 Project CC-OPS Status Active Point Value 1.00 Time (min) 3 Open or Closed Reference Cognitive Level MEMORY Operator Discipline LO-ct Operator Type job References Provided K/A Justification SRO-Only Justification Additional Information K/A Info: 051 Loss of Condenser Vacuum AK3 - Knowledge of the reasons for the following responses as they apply to the Loss of Condenser Vacuum:

AK3.01 - Loss of steam dump capability upon loss of condenser vacuum

References:

AOP-7G Comments: Modified St. Lucie 2011 RO Exam for ILO Exam Bank use. JLG K/A Reference(s)

APE.051.AK3.01 Safety Function 4 Tier 1 Group 2 RO Imp: 2.8* SRO Imp: 3.1*

Knowledge of the reasons for the following responses as they apply to the Loss of Condenser Vacuum: (CFR 41.5,41.10 / 45.6 / 45.13)

Loss of steam dump capability upon loss of condenser vacuum Learning Objective(s)

Question not linked to a Learning Objective Cross Reference Links None Question ID: 1450967 02/09/2021 3 of 3

Exam Material SG Blowdown Tank Rad Automatic actions when RI-401... Question Preview Original Question #51 ID: 1442194 Points: 1.00 SG Blowdown Tank Rad Monitor, RI-4014, alarms. What automatic action(s), if any, occur(s)? Assume BD REC HI-TEMP DUMP, 1-BD-4088-CV, is open.

A. Blowdown isolation CVs go shut and blowdown recovery shifts to Miscellaneous Waste system.

B. Blowdown recovery shifts to Miscellaneous Waste System and operator action needed to shut SG Blowdown CVs.

C. Blowdown isolation CVs go shut and blowdown recovery shifts to the Circulating Water System.

D. None. Manual operator action is required to shut the SG Blowdown CVs and shift blowdown recovery to Miscellaneous Waste.

Answer A Answer Explanation No explanation provided Question Information Topic SG Blowdown Tank Rad Automatic actions when RI-4014 alarms User ID SGBD Q24651 System ID 1442194 Project CC-OPS Status Active Point Value 1.00 Time (min) 3 Open or Closed Reference CLOSED Cognitive Level MEMORY Operator Discipline LO-I Operator Type RO CFR: 41.7 Design, components, and functions of control and safety 10CFR55 Content systems, including instrumentation, signals, interlocks, failure modes, and automatic and manual features.

References Provided N/A K/A Justification N/A SRO-Only Justification Not applicable Additional Information N/A Question ID: 1442194 02/09/2021 2 of 3

Exam Material SG Blowdown Tank Rad Automatic actions when RI-401... Question Preview Basis: SG Blowdown Tank Rad Monitor R1-4014 Alarms High

References:

55.41:7 55.43:5 / SD-19KA1:

018K1.02KA2: K4.01 K/A Reference(s)

SF1.014.K4.01 Safety Function 1 Tier 2 Group 2 RO Imp: 2.5* SRO Imp: 2.7*

Knowledge of RPIS design feature(s) and/or interlock(s) which provide for the following: (CFR: 41.5 / 45.7)

Upper electrical limit Learning Objective(s)

Evaluate the response of the SG Blowdown and Recovery system for the following conditions:

RI-4014 ( SG Blowdown tank) in alarm RI-4095 ( SG Blowdown Recovery) in alarm User (Sys) ID 24428 (1203645)

Cross Reference Links None Question ID: 1442194 02/09/2021 3 of 3