Seismic Monitoring Flashcards
What occurs when a seismic trigger receives a starting signal and what signal would it receive to start?
1) A ground acceleration magnitude of greater than 0.01g
2) Starts all time-history accelerographs
3) Illuminates the amber EVENT ALARM light on the SMA-3 Control Panel (on local Seismic Monitoring Panel 10C673 in the Upper Relay Room).
4) flag EVENT INDICATOR on the SMA-3 Control Panel to change in color from BLACK to WHITE.
5) ground acceleration subsides
10 second time delay:
a) All time-history accelerographs will shut off.
b) The EVENT ALARM on the SMA-3 Control Panel light will extinguish.
What occurs when a seismic switch receives a starting signal and what signal would it receive to start?
1) The seismic switch actuates on a ground acceleration magnitude of 0.1 g (OBE)
2) Control Room annunciator window box C6-C4, SEISMIC MON PNL C673.
3) Amber ALARM light on the Seismic Switch Power Supply portion of Seismic Monitoring Panel 10C673.
NOTE: The ALARM light on Seismic Monitoring Panel 10C673 is not the same light that is actuated by the seismic trigger.
Define OBE
Operating Basis Earthquake (.1g ground acceleration)
Define SSE
Safe Shutdown Earthquake(.2g ground ecceleration)
What alarms do the spectrum recorders and switches actuate?
1) Alarm lights are red when vibrations are at or above building design limits.(>.2g)
2) Alarm lights are amber when vibration levels exceed 70% of building design limits.(<.2g)
What are the power supplies to the Seismic monitoring equipment?
10C673 (in Upper Relay Room) is powered from NON-1E 120VAC UPS 1CJ483 (w/ local battery backup)
What do the Time History Accelergraphs do and where are they located?
Start at .01g and run for 10 sec after the event subsides
Locations:
1. Behind NOSF (Burried 60 ft)
2. TWCU Pump Room
3. Refuel Floor
4. Core Spray piping to RPV
5. Aux Building Foundation
