Loose Parts and Vibes

Question 1

What is the power supply for the Loose Part and Vibration Monitoring System (SV)?

Answer 1

NNN-D11

Question 2

What action is required if a valid 10 mil vibration alarm is in for a Reactor Coolant Pump?

Answer 2

Trip the reactor and stop affected RCP’s

Question 3

What Mode does TLCO 3.3.106 require the Loose Parts computerto be in to be considered FUNCTIONAL?

Answer 3

Supervisory

Question 4

Will a spurious Loose Parts alarm cause a Control Room alarm on B07 (LOOSE PARTS VIB MON SYS TRBL – 7C14B)?

Answer 4

• Supervisory Mode (Normal operating mode)
  o **MCR alarms only generated for VALID alarms **
  o Automatically analyzes all events to determine if they are valid.
  o All INVALID events will be logged only.
  o LPVMS is only Functional in Supervisory Mode.

Question 5

What resets the Control Room alarm for Loose Parts?

Answer 5

There is a note in 40OP-9SV01 that states:
Window 7C14B will be automatically reset by the Palo Verde Loose parts Computer even with a valid alarm locked in at the computer. All loose parts alarms should be immediately investigated even though the Control Room alarm clears a short time after it comes in.

Question 6

How many sensors are there for the Loose Parts System?

Answer 6

LPMS (Loose Parts Monitoring System)
* **8 acoustic signals **to hear impacts. (Detects and records)
o Vessel Upper Head (2)
o Vessel Lower Head (2) mounted to incore nozzles
o Hot Leg to each SG (2)
o Outlet pipe from RCP 1A and 2A (2)

The RCPOVMS uses accelerometers (1 per RCP) to monitor RCP motor vibration (Channels 17 thru 20) and proximity probes (3 per RCP) to monitor RCP shaft displacement (Channels 21 thru 32); inputs for these channels are directed to cabinet SVNC02 for analysis.