Safety Injection Flashcards
Given the following conditions: Reactor tripped MSIS SIAS CIAS All equipment is operating as required.
The operator places the hand switch for HPSI pump ‘B’ to the start then stop position. What effect if any will this manipulation have on further pump operation?
HPSI ‘B’ has been placed in SIAS override and stopped, all further stops and starts must be performed manually.
ECCS Design Criteria are:
Peak Cladding Temperature </= 1%
Maintain a coolable Core Geometry
Capable of Long term Core cooling
Why do SI Pump Recirc valves close on a RAS?
Prevent highly contaminated water from getting into the RWT.
Preserve Sump Inventory.
ref: Lesson Plan
State the LPSI Pump characteristics and limitations.
Powered from PBA and PBB Design flow 4300 Shutoff Head 210 psi Pump can run 1 hour at 100 gpm Pump can run unlimited time at 2400 gpm
ref: Lesson Plan
State the CS characteristics and limitations.
Powered from PBA and PBB Design flow 3890 gpm Shutoff Head 290 psi Pump can run 1 hour at 150 gpm Pump can run unlimited time at 2100 gpm
ref: Lesson Plan
Which of the following is not design criteria for containment spray?
A: To reduce containment pressure.
B: To remove Iodine from the containment atmosphere.
C: To minimize the containment sump oxygen levels.
D: Operate for a period of one year following a pipe break.
C
What determines the amount of heat removed from the shutdown cooling system during normal operations?
Determined by throttle position of SIA-HV-306 or SIB-HV-307, Shutdown Cooling Heat Exchanger Bypass valves.
List the following ratings of the LPSI pump
Rated Flow:
Minimum flow for unlimited operation:
Shutoff head:
Rated Flow: 4300 GPM at 145 psia
Minimum flow for unlimited operation: 2400 GPM
Shutoff head: 210 psia
List the following ratings of the Containment Spray pump
Rated Flow:
Minimum flow for unlimited operation:
Shutoff head:
Rated Flow: 3890 psia at 220 psia
Minimum flow for unlimited operation: 2100 GPM
Shutoff head: 290 psia
Normal flow following an accident requiring spray flow is greater than 4350 GPM
According to the ECCS design criteria found in 10CFR “The calculated total
oxidation of the cladding shall nowhere exceed _____ of the total cladding thicknessbefore oxidation.”
A. 1%
B. 35%
C. 17%
D. 27%
C
The HPSI cold leg injection orifice is used during simultaneous hot and cold leg
injection to:
A. help balance SI flow to the hot and cold leg injection headers by being sized to
allow approximately 50% flow.
B. provide minimum recirculation flow for the HPSI pumps to prevent overheating.
C. prevent exceeding runout condition in the HPSI pumps to prevent pump
cavitation.
D. provide instrumentation to measure flow to the hot and cold leg injection headers.
A
Which one of the following is an important reason to locate and stop a leak in the
safety injection piping outside of containment during a large LOCA?
A. Prevent safety injection pump runout during the injection phase following a
LOCA.
B. Reduces the amount of fixed contamination that will remain in the containmentafter repair of the leak.
C. A LOCA outside of containment could result in inadequate containment sump
inventory to allow recirculation.
D. Prevent short circuit of the auxiliary building electrical systems with resultant
possibility of electric shock.
C
Given the following plant conditions:
A LOCA has occurred on Unit 1.
Approximately one minute after the Train B Essential Chiller started, a fault locks outPBB-S04.
RCS pressure is 750 psig and lowering.
Based on this, the expected safety injection would be:
A. increasing LPSI and HPSI flow into all reactor coolant loops.
B. increasing HPSI flow into reactor coolant loops 1A and 1B only.
C. increasing LPSI and HPSI flow into reactor coolant loops 1A and 1B only.
D. increasing HPSI flow into all reactor coolant loops.
D
When filling a safety injection tank (NOP/NOT), which of the following is one
possible consequence of stopping the HPSI pump and not closing the SIT fill/drain valve?
A. The SIT will flow into the RWT.
B. The SIT will flow into the RCS.
C. The RWT will flow into the SIT.
D. The RCS will flow into the SIT.
A
Given the following conditions:
Reactor Tripped SIAS CIAS MSIS All equipment is operating as required
The Operator places the control switch for SIB-P02 (HPSI Pump) into the STARTposition and then to the STOP position. What effect, if any, will this manipulation have on further pump operation?
HPSI pump “B” has been placed into SIAS override ….
A. but will continue to run, unless taken to stop a second time.
B. and stopped, all further starts and stops will have to be done manually.
C. and stopped, it will now respond to any automatic actuation signals.
D. and stopped, it can only be restarted after the SIAS has been reset.
B
The minimum required volume of the RWT is based on ensuring that by the time of RAS, the water level in the containment sump will be enough to provide NPSH for
the ESF pumps and the decay heat boil-off rate is less than…
A. 75% of the minimum design flow of one HPSI pump.
B. 75% of the minimum design flow of two HPSI pumps.
C. the minimum design flow of two HPSI pumps and two LPSI pumps.
D. the minimum design flow of one HPSI pump and one LPSI pump.
A
