Which set of RCS loop penetrations is accurate?
Loop 1: RHR suction (Th)
Loop 2: PZR surge (Th) , Low Press SI
Loop 3: RCS Sample (Th)
Loop 4: RHR Suction (Th) , Low Press SI
When starting the first RCP, steam generator secondary side temperatures must be less than or equal to 200F and not more than 50F above all RCS WR cold leg temperatures.
What is the reason for these temperature limitations?
to ensure an energy addition transient will not damage the RHR relief valves
Which of the following is a function of the reactor head vent system?
venting hydrogen gas to the PRT following LOCA
When the RCS is in solid state operation unisolating any previously isolated portions of the RCS are prohibited with the following exceptions:
placing the SI accumulator isolations on the backseat for packing replacement
Why is there a precaution about not allowing the RCS water level to rise above the reactor vessel flange with the head removed unless filling the system?
could wash contaminants onto the RX vessel flange and CRDMs
Which is a function of the RCS?
to transport thermal energy produced in the core to the SGs
acts as one of hate three fission product barriers
what is the sequence of components in the reactor coolant system as coolant flows through the single loop?
RCP
cold leg isolation valve
Rx vessel
hot leg loop isolation valve
SG
back to RCP
On a loss of all AC power, identify the RCS heat removal mechanism which removes heat from the reactor core.
the elevation differences between the SG and Rx vessel, coupled with operation of the TDAFWP establishes natural circulation cooling
On a LOCA coupled with a LOP, what protection is available to prevent a core meltdown?
combination of all the factor above provide protection
One hour after LBLOCA, what is the major source of increased radiation levels in the charging pump cubicles?
ECCS pump suction has been transferred to the recirc sump
What is the function of the reactor coolant pumps?
to circulate coolant to transfer nuclear heat from the fuel to the secondary
The purpose of the RCS loop stop valve disc depressurization subsystem is:
to relieve pressure build up between the loop stop valves discs to prevent hydraulic lock
The sources of normal pressurizer spray are:
Loop 1 and 2 cold legs
How is leakage past the reactor vessel O-rings detected?
temperature element will actuate an alarm on MB4
How is the RCP pump radial bearing cooled during normal pump operation?
seal injection flow passes through the bearing
Plant is at 100% when the “C” RCP beings to increase vibrations. It must be removed from service.
What is the max percent reactor power that will allow this removal without a Rx trip?
37%
Plant is S/D. RCS loop 1 and 2 are isolated. “C” and “D” RCPs are running.
If the pressurizer pressure controller sends an OPEN signal to the spray valves, what will be the status of the pressurizer spray flow?
spray flow will initiate, but at a much lower flow rate since the “A” and “B” RCP are not running
How is RCS loop flow measured?
DP across the SG outlet elbow inputs to flow indication for each loop
