RWM

Following a Unit One reactor scram, 128 control rods have fully inserted. Nine control rods are at position 02. What will the RWM shutdown confirmation screen display for reactor Shutdown; and can it be determined the reactor will remain shutdown under all conditions without boron?


A. Shutdown: No; it can be determined the reactor will remain shutdown under all conditions without boron.
B. Shutdown: Yes; It can be determined the reactor will remain shutdown under all conditions without boron.
C. Shutdown: No; it cannot be determined the reactor will remain shutdown under all conditions without boron.
D. Shutdown: Yes; it cannot be determined the reactor will remain shutdown under all conditions without boron.

Following a Unit 1 Reactor scram, 134 control rods have fully inserted. One control rod is at position 04 and two control rods are at position 02.What will the RWM shutdown confirmation screen display?

A. All RODS IN: NO
SHUTDOWN: NO
B. All RODS IN: NO
SHUTDOWN: YES
C. RODS IN: YES
SHUTDOWN: NO
D. RODS IN: YES
SHUTDOWN: YES

Which of the following could contribute to non-conservative enforcement of RWM rod insert and withdraw blocks (RWM may not enforce rod blocks when required)?
A. APRM GAFs are adjusted to be >1.0.
B. Steam flow transmitter A fails upscale.
C. Partial opening of a turbine bypass valve.
D. Feedwater flow transmitter B fails downscale.

A turbine trip and reactor scram occurs on Unit One. The following indications are on the full core display:

Green Lights Lit 136 rods
Red lights Lit one rod

Which one of the following choices completes the statements below?
RWM Shutdown Confirmation Screen will display ____________.
The reactor _________ remain shutdown under all conditions without boron.


A. Shutdown: NO
will

B. Shutdown: NO
will not

C. Shutdown: YES
will

D. Shutdown: YES
will not

Rod Worth Minimizer uses for reactor power indication. When operating in the Transition Zone, Rod Motion Blocks will be:

A. feed flow from the feedwater level control system; generated but not enforced.
B. feed flow from the feedwater level control system; generated and enforced.
C. steam flow from the feedwater level control system; generated but not enforced.
D. steam flow from the feedwater level control system; generated and enforced.

A reactor startup is in progress. During the startup, three rods had failed reed switches at their withdraw limits:
26-31 position 3650-15 position 2418-15 position 12

Rod position was verified per OP-7 and a substitute position was inserted. While continuing the startup with the three substituted rod positions, a reactor scram occurs. After the scram, the following information is indicated: Process computer indication All rods at position FF RWM SHUTDOWN SCREEN ALL RODS IN: YES SHUTDOWN: YES RODS NOT FULL IN: 000

Determine if the response from the RWM indication of ALL RODS IN is accurate and why:

A. Yes. The process computer printout showing FF's is given only when a rod is inserted past 00.
B. No. The substituted rod positions caused the RWM to automatically bypass the affected rods in evaluating the shutdown confirmation.
C. Yes. RWM automatically deleted the substituted positions when good reed switch data was detected when the scram occurred.
D. No. Substitute rod positions remove the input from RPIS. ERFIS and the Process Computer positions can not be determined