SESS Flashcards
What is the power supply for SESS?
The SESS Panels receive power from the ‘A’ Train and ‘B’ Train 125 VDC Class Distribution buses (PK)
What is the Safety Equipment Status System (SESS) Function / Design Bases?
- To monitor the status of Engineered Safety Features (ESF) equipment and alert the control room operator by distinct visual and audible means when any of the monitored ESF equipment becomes inoperable or bypassed. (White Light)
- To monitor the status of ESF components in the event of an ESFAS and alert the control room operator by distinct visual and audible means when any of the monitored ESFcomponentdidnotcompletetransition to the required safe operating position. (Blue Light)
How does SESS interact with PPS?
SESS receives safety signal inputs from PPS.
Describe the interaction between SESS and QSPDS (SH).
SESS sends the status of Containment Isolation Valves to QSPDS.
Describe the Safety Equipment Inoperable Status (SEIS) sub-system.
The Safety Equipment Inoperable Status (SEIS) sub-system indicates any specific component of safety equipment which has been rendered inoperable by illuminating a white light on the component level indicator panel.
Describe the Safety Equipment Actuation Status (SEAS) sub-system.
The Safety Equipment Actuation Status (SEAS) sub-system indicates any specific component of safety equipment that does not transfer to its safe position upon the receipt of a safety actuation signal by illuminating a blue light on the component level indicator panel.
What does the SESS ‘ALARM RESET’ button do?
Acknowledges alarms received on the associated system level window cabinet by silencing the audible device (either SEIS or SEAS tone); the ‘ALARM RESET’ does not affect window or component indicator panel lamp operation.
What does the SESS ‘FLASHER RESET’ button do?
Changes a fast flashing window to steady on for sustained alarms, or a fast flashing window to slow flashing for momentary alarms.
What does the SESS ‘LAMP RESET’ button do?
Changes a slow flashing window to off after the alarm condition has cleared.
What does the SESS ‘BYPASS/INOP TEST’ button do?
Simulates an alarm condition for all SEIS inputs; lights all system level alarm windows (white fast flashing) and component level indicator (white steady on) lamps; testing is completed by operating the reset buttons.
What does the SESS ‘STATUS TEST’ button do?
Simulates an alarm condition for all SEAS inputs along with simulating all safety actuation signals; lights all system level windows (blue fast flashing) and component level indicator (blue steady on) lamps; testing is completed by operating the reset buttons.
What does the SESS ‘STATUS DISPLAY’ button do?
Simulates actuation of all safety actuation signal inputs only to provide the operator with position information (safe/not safe) for all automatically actuated safety equipment; those components that are not in a safe condition (ESF actuated position) when the STATUS DISPLAY button is depressed are indicated by a blue steady on light on the component level indicator panel; testing is complete when the STATUS DISPLAY button is released.
Describe the condition required to generate ‘SESS PWR OR GND TRBL’.
- SESS Panel Power Supply Trbl
- SESS Panel Ground
- SESS Loss of Power
