IPT 1 Flashcards
You are directed to raise power on the Unit from 20-50% power. Which procedure do you use to determine the maximum power escalation rate?
1[2]-GOP-101, Reactor Operating Guidelines During Steady State and Scheduled Load Changes
Unit 2 has been operating at 100% power for months. The Unit unexpectedly trips due to equipment failure. The plant is shutdown for 21 days for repairs. What is the maximum allowed power escalation rate?
IF performing a mid cycle shutdown or power reduction AND a return to full power occurs within 27 days, THEN RAISE power at a maximum power escalation rate of 30% / hour.
Unit 1 operated at 45% power for 5 days and then shutdown due to equipment problems. Unit 1 has been restarted and raising power from 20-40%. What is the maximum power escalation rate?
1-GOP-101
4.8 MW/Min
This is a ‘Category 2’ condition.
What procedure(s) provide(s) the ASI Steady State and Transient Bands?
1[2]- GOP-101, Reactor Operating Guidelines During Steady State and Scheduled Load Changes
0-NOP-100.02, Axial Shape Index Control
What is the ASI Steady State control band?
Steady State Band:
* ESI plus or minus 0.5 during steady state base load operation
What is the ASI Transient control band?
Transient Band:
* ESI plus or minus 0.2 during load transients.
* ASI control to plus or minus 0.1is recommended whenever practical.
State the Technical Specification Limit for RCS T-cold
RCS T-cold shall be maintained less than or equal to 551°F per
Technical Specification 3.2.5 and COLR Table 3.2-1
At greater than or equal to 50% power, boration/dilution is the primary means to compensate for changes in power level and transient xenon. Why?
Using boration/dilution to compensate for power changes subjects the majority of the fuel rods to uniform and smooth power transients.
What method is used for monitoring RCS T-cold when maintaining steady state power level?
DCS is the preferred method for monitoring T-cold
Average of four channels of RPS T-cold may be substituted when DCS T-cold is unreliable.
As the RCO, what is the 100% power RCS T-cold band to be maintained?
Maintain 100% power T-cold between 550.4 and 550.6F
Why is the pressurizer placed on recirculation if plant power is being changed?
To maintain the pressurizer and RCS boron concentration within 25ppm while changing boron concentration.
You’ve been directed to remove the pressurizer from recirculation. How many Backup Heater Banks are typically in service during steady state conditions?
Enough Backup Heater banks to keep the Proportional Heater banks at approximately 50% output
How are ESI and ASI related?
Equilibrium Shape Index (ESI) is the value of the ASI in equilibrium condition at the power level to which the reactor will be bought for continued operations.
This value represents the average ASI target for the core.
When is the ‘sliding scale’ ESI value used?
During reactor startups and shutdowns and power maneuvers greater than 10%
Above what power level is ASI control required at all times?
APPLY Axial shape control under the following conditions:
At all times when core power is at or above 40% of rated power
Should be considered and established as soon as possible after exceeding 25% power
CEA withdrawal during power operation > 50% power is limited to small steps. Why?
CEA withdrawal during power operation greater than 50% power should be in small steps. Withdrawal in excess of 10 inches in any 15 minute period should be avoided. This technique should reduce the likelihood of fuel failures due to large local power density changes in the vicinity of the CEA finger tips.
As the RCO you are operating the reactor at 100% power, steady state conditions. If RCS-T-cold drifts high, at what temperature do you have to take action?
550.8F to avoid exceeding 551F
Why don’t we reduce plant power and with draw CEAs at the same time for ASI control?
Simultaneous power reduction / CEA withdrawal or power escalation / CEA insertion should NOT be carried out since both actions tend to accelerate the axial power shape shift in the same direction and thus induce xenon oscillations. These actions could also result in a rapid shift of the ASI outside the transient band.
What is the maximum permissible pressure differential between condensers?
The maximum permissible pressure differential between Condensers is 2.0 inHgA.
What is the Manual Turbine Trip Criteria for Condenser Differential Pressure?
A manual Turbine trip is required at 2.5 inHgA pressure differential between Condensers.
S/G wide range level changes 1%. What is the corresponding change in S/G narrow range level?
5%
State the turbine trip criteria for the following conditions:
a. Turbine Bearing #1 - #6 maximum BRG Metal Temp
b. Turbine Bearing #7 and #8 maximum BRG Metal Temp
c. Turbine Bearing #1 – 9 Oil drain Temp
Turbine BEARING # 1 thru BEARING # 6 maximum BRG
METAL TEMP is less than: (Turbine Trip Criteria) 250°F
Turbine BEARING # 7 and BEARING # 8 maximum BRG
METAL TEMP is less than: (Turbine Trip Criteria) 225°F
Turbine BEARING # 1 thru BEARING # 9 OIL DRAIN TEMP is
less than: (Turbine Trip Criteria) 180°F
Why are there limits on Turbine Exhaust Hood Temperatures?
To avoid unnecessary stress due to expansion of the exhaust chamber and misalignment of the low pressure turbine inner cylinder and rotor, exhaust hood temperatures should be adhered to as follows:
DEH display 5559, TURBINE EXHAUST HOOD SPRAY AND CONDENSER VACUUM, may be used to monitor both LP Turbines exhaust hood conditions:
* High EXHAUST HOOD TEMP Turbine trip is 250°F.
* High EXHAUST HOOD TEMP alarm is 175°F.
* Exhaust hood sprays automatic actuation 160°F.
* Maximum EXHAUST HOOD TEMP DIFF between LP Turbines should NOT exceed 50°F.
Normally the plant operates with all four MSRs in service. Is the plant allowed to operate for extended periods with less than four MSRs?
Extended Power Operations with less than all four Moisture Separator Reheaters in service shall have a documented engineering analysis on a case-by-case basis.