Control Building HVAC Flashcards
Unit 2 is at 100% power with all systems in a normal lineup.
Control Room Normal AHU HJN-A02 trips on thermal overload.
Which of the following rooms no longer have cooling?
A. 160’ Cable Spreading Room
B. 120’ Communication Equipment Room
C. 100’ Train A ESF Switchgear Room
D. 74’ Control Building Basement
B
Unit 1 was at 100% power with all systems in a normal lineup.
A LOCA results in a reactor trip, a SIAS, and a CIAS.
All equipment operates as designed.
The 120’ Control Building Communications Equipment and Inverter Rooms are being cooled by:
A. nothing
B. ‘B’ Train Control Room Essential AHU HJB-F04
C. Control Room Normal AHU HJN-A02
D. Control Building Normal AHU HJN-A05
A
Which of the following areas is NOT supplied by Control Building Normal AHU HJN-A01?
A. 74’ Control Building Basement
B. 120’ Cable Spreading Room
C. 120’ Communications Equipment and Inverter Rooms
D. 160’ Cable Spreading Room
C
HJA-HS-58 controls the following:
Control Building Normal AHU Essential Return Duct Isolation Damper HJA-M36
Control Building Normal AHU Essential Return Duct Isolation Damper HJA-M51
ESF Normal AHU Essential Supply Duct Isolation Damper HJA-M66
ESF ‘A’ Essential AHU Essential Supply Duct Isolation Damper HJA-M62
All dampers were in their normal position when SIAS actuated.
All dampers are now closed.
What is the indication on HJA-HS-58?
A. Dark
B. Red light ONLY
C. Green light ONLY
D. BOTH Red and Green lights
D
Unit 1 is at 100% with all systems in their normal lineup.
‘A’ Battery Room Normal Exhaust Fan HJN-J01A is running.
HJA-HS-81, the operating switch for ‘A’ Battery Room Essential Exhaust Fan HJA-J01A, is placed to START and then released.
Which of the following is true concerning the equipment response?
A. HJA-J01A will not start because HJN-J01A is running.
B. HJA-J01A will start. HJN-J01A will continue to run.
C. HJA-J01A will start. HJN-J01A is interlocked to immediately trip when HJA-J01A is running.
D. HJA-J01A will start. HJN-J01A will trip on high duct differential pressure.
D
Which of the following components can NOT be controlled from the Remote Shutdown Panel?
A. ‘B’ CR Essential AHU HJB-F04 OSA intake damper HJB-M02
B. ‘B’ CR Essential AHU HJB-F04 OSA intake damper HJB-M03
C. ‘B’ Battery Room Essential Exhaust Fan HJB-J01B
D. ‘B’ CR Normal AHU Isolation Dampers HJB-M01/M55
C
Unit 3 is at 100% with all systems in their normal lineup.
RU-29 fails high, resulting in an actuation of both trains of CREFAS.
All equipment operates as designed.
Control Building Normal AHU HJN-A01 is ___(1)___, and Control Room Normal AHU HJN-A02 is ___(2)___.
A. (1) running; (2) running
B. (1) running; (2) not running
C. (1) not running; (2) running
D. (1) not running; (2) not running
B
Refer to drawing 01-E-HJB-0024.
Unit 1 is at 100% power with all systems in their normal lineup.
An ammonia spill in the North Yard causes the control room to manually initiate both trains of CRVIAS.
Subsequently, RU-30 fails high, resulting in an actuation of both trains of CREFAS.
All equipment operates as designed.
The RO places handswitch HJA-HS-36 for CR Essential AHU Outside Air Intake Damper HJA-M02 to the OPEN position.
The OVERRIDE light on HJA-HS-36 will be ___(1)___ and the damper will be ___(2)___.
A. (1) on; (2) closed
B. (1) on; (2) open
C. (1) off; (2) closed
D. (1) off; (2) open
A
The ‘A’ CR Normal AHU discharge isolation damper (HJA-M01) is OPEN and the ‘B’ discharge isolation damper (HJB-M01) is CLOSED. The RO goes to start the CR Normal AHU (HJN-A02); will the AHU start?
Interlocks exists that will prevent the CR Normal AHU (HJN-A02) from starting unless both of its discharge dampers (HJA-M01 & HJB-M02) are OPEN. In addition, a closure of either of these dampers will trip off the AHU.
Why are the CR Normal AHU isolation (suction and discharge) dampers powered from their respective PK buses?
The “B” essential air filtration unit (HJB-F04) utilizes the same duct work as the Normal AHU (HJN-A02), the dampers are necessary to isolate the Normal AHU from the essential ventilation system when required (i.e. SIAS, LOP, CREFAS, CRVIAS).
The isolation dampers are air operated and fail close on a loss of air or power.
The Control Building Normal AHU (HJN-A01) is interlocked with suction damper (HJA-M51) such that …
if the damper is CLOSED the AHU will NOT start and if the damper closes while the AHU is running, the AHU will stop.
If the ESF Switchgear Normal AHU (HJN-A03)discharge damper (HJA-M66) is OPEN and discharge damper (HJB-M66) is CLOSED, will the AHU start if given a start signal?
Yes, the ESF Switchgear Normal AHU (HJN-A03) will run if only one of its discharge dampers HJA-M66 or HJB-M66 is OPEN.
Conversely, the AHU will stop when both dampers go CLOSED.
The CR Essential AHUs (HJA-F04 & HJB-F04) will start on which ESFAS and BOP-ESFAS signals?
SIAS CSAS CREFAS CRVIAS LOP
A SIAS has initiated and the intake dampers (HJA-M02/M03 and HJB-M02/M03) to the CR Essential AHUs ‘A’ and ‘B’ have gone OPEN. The Control Room has determined to err on the conservative side and recirculate the air to the CR. What method or methods can the RO use to shut the intake dampers?
The RO can override the SIAS to shut the intake dampers or manually initiate a CRVIAS.
The ESF Equipment Room Essential AHUs (HJA-Z04 & HJB-Z04) are interlocked with their respective discharge dampers (HJA-M62 or HJB-M58) in that if the damper …
goes CLOSED the fan will trip.
The Battery Room Normal (HJN-A01A, B, C, D) will automatically STOP if its …
respective room CO2 flood system actuates -OR-
its associated Essential Exhaust fan starts either from being manually started from the CR -OR-
from a SIAS or LOP, (sensed by a high D/P across the Essential Fan)
What is the status of the thermal overload protection for the Battery Room Essential Exhaust fans (HJA-J01A,B and HJB-J01A,B) during a SIAS?
The thermal overload protection is BYPASSED.
(ANNUNCIATOR) CONT BLDG HVAC SYS TRBL
The HJ HVAC system is so large, there are quite a few inputs to this alarm window. These include problems with the: Normal Control Building AHU Control Room AHU ESF Equipment Room Essential AHUs ESF Equipment Room Normal AHUs Battery Room Exhaust fans
Note: In most cases, an AO would need to be dispatched to investigate.
(SESS Component Alarm) CR ESS AHU FAN A F04
WHITE section (SEIS) comes in when:
- LC bkr is NOT in the OPERATE position
- Control Power fuse is blown
- Fan has tripped due to an electrical fault
BLUE section (SEAS) comes in when:
- The bkr is OPEN when it’s actuated position is CLOSED
- OPEN control power supply bkr
- Blown control power fuses for the fan
- Fan or motor is binding
(SESS Component Alarm) ESF RMS ESS AHU A Z03
WHITE section (SEIS) comes in when:
- MCC bkr is OPEN
- Control Power fuse is blown
- Motor O/Ls are OPEN
BLUE section (SEAS) comes in when:
- OPEN supply bkr when it’s actuated position is CLOSED (Fan running)
- Blown Control power for the motor
(SESS Component Alarm) ESF RMS ESS AHU A Z04
WHITE section (SEIS) comes in when:
- MCC bkr is OPEN
- Control Power fuse is blown
- Motor O/Ls are OPEN
BLUE section (SEAS) comes in when:
- OPEN supply bkr (Fan not running) when it’s actuated position is CLOSED (Fan running)
- Blown Control power for the motor
- Damper HJA-M62 is fully CLOSED.
(SESS Component Alarm) BAT RM A ESS EXH FAN J01A
WHITE section (SEIS) comes in when:
- MCC bkr is OPEN for either fan
- Control power fuse is blown for alarming fan
- Motor O/Ls are OPEN for either fan
BLUE section (SEAS) comes in when: - MCC contactor is OPEN (Fan not running) when its actuated position is CLOSED (Fan Running)
Unit 1 is at 100% power with all systems in a normal lineup.
The CO initiates ‘A’ CREFAS and ‘A’ CRVIAS from B05.
All components actuate as designed.
Ten minutes later, PKA-M41 develops a ground and de-energizes.
What is the position of Control Room Essential AHU HJA-F04 outside air intake damper HJA-M03?
A. Held open by air pressure
B. Held closed by air pressure
C. Open due to relief of air pressure
D. Closed due to relief of air pressure
C
