EOP Week 7 & 8 Flashcards
Deck Covers: FR-H, FR-C, FR-I, FR-P
What is the most effective way to exit FR-C.1 “Response to Inadequate Core Cooling”
- Establish ECCS Flow
While in FR-C.1 “Response to Inadequate Core Cooling” what is the basis for the rapidly depressurizing SGs to depressurize the RCS at maximum rate
- Allows accumulators and RHR pump injection
While in FR-C.1 “Response to Inadequate Core Cooling” if normal support conditions for starting an RCP are NOT available, what action is taken
- Start 1 RCP at a time until CETCs are LESS THAN 1200 deg F
What parameters are used to determine Core Cooling CSFST status
- Subcooling
- CETC temps
- RVIS Level w/ RCP status
What CETC temperature corresponds to superheated conditions
- 757 deg F
What is the primary goal of maintaining Core Cooling
- Maintain the RCS subcooled
What is the definition of Degraded Core Cooling (Orange Path)
- CETCs GREATER than 757 deg F
OR - RVLIS LESS than 46%
During a CL SBLOCA, what happens when the loop seal clears
- Rapid depressurization causes mass loss to be greatly reduced
- Energy removal increases
What size SBLOCA is the most limiting and WHY
- 1” break because the loop seal never clears
What are high CETC temperatures (GREATER THAN 757 deg F) an indication of
- Superheated conditions
What are low RVIS levels and indication of
- Core uncovered
What COLOR is entry into FR-C.1 “Response to Inadequate Core Cooling”
- RED PATH
While in FR-C.1 “Response to Inadequate Core Cooling”, if SI IS NOT terminated, what are the consequences
- Prevents performing any of the INVENTORY FRPs
What indication is used to determine that the core is re-covered
- RVLIS GREATER THAN 46%
While in FR-C.1 “Response to Inadequate Core Cooling”, WHY are RCPs stopped after the SGs are depressurized to 160 PSI
- Due to a loss of #1 RCP seal requirements
While in FR-C.1 “Response to Inadequate Core Cooling”, WHY are RCPs running desired
- Provide forced 2 phase flow to prevent inadequate core cooling (DO NOT TRIP UNLESS DIRECTED BY PROCEDURE)
What COLOR is entry into FR-C.2 “Response to Degraded Core Cooling”
- ORANGE PATH
While in FR-C.2 “Response to Degraded Core Cooling”, if ALL RCPs are running, what action is taken
- Stop #3 RCP for later use
What COLOR is entry into FR-H.1 “Loss of Secondary Heat Sink”
- RED PATH
While in FR-H.1 “Loss of Secondary Heat Sink”, WHEN would Secondary Heat Sink NOT be required
- During LBLOCA OR RCS Temperature less than 350 deg F (RHR entry condition)
While in FR-H.1 “Loss of Secondary Heat Sink”, if NO CCP is available for bleed and feed what action is taken
- IF ALL SG WR lvls are GREATER THAN 31% THEN stop ALL RCPs and bleed and feed immediately to ensure sufficient SI flow
While in FR-H.1 “Loss of Secondary Heat Sink” how is restoration of Secondary Heat Sink verified
- Lowering RCS Temps (CL, HL, CETCs) AND rising SG Lvl
While in FR-H.1 “Loss of Secondary Heat Sink” following bleed and feed initiation, AFTER feed flow is restored given the following conditions how are feed flows controlled:
- CETCs are RISING
- At least ONE SG IS NOT dry
- Feed any SGs that are NOT dry at MAX rate
- WHEN CETCs lower. check active SG for fault/rupture
- IF faulted/ruptured, THEN feed ONE intact SG at 50k pph
- WHEN intact SG is greater than 16% WR, THEN raise flow as necessary to maintain CETC AND isolate faulted/ruptured SG
While in FR-H.1 “Loss of Secondary Heat Sink” following bleed and feed initiation, AFTER feed flow is restored given the following conditions how are feed flows controlled:
- CETCs are RISING
- ALL SGs are dry
- Feed ONE SG at max rate
- WHEN CETCs lower. check active SG for fault/rupture
- IF faulted/ruptured, THEN feed ONE intact SG at 50k pph
- WHEN intact SG is greater than 16% WR, THEN raise flow as necessary to maintain CETC AND isolate faulted/ruptured SG
While in FR-H.1 “Loss of Secondary Heat Sink”, what are the criteria for Bleed and Feed initiation
- No CCPs available AND ALL SG WR lvls GREATER THAN 31%
OR - LESS THAN 3 SG WR lvls GREATER THAN 16%
What are the benefits of Bleed and Feed in response to inadequate Secondary Heat Sink
- Minimizes the amount the core is uncovered
- Prevents inadequate core cooling
What are the benefits of stopping ALL RCPs in response to inadequate Secondary Heat Sink
- Preserves SG inventory by removing RCP heat and backpressure
What is the definition of a dry SG
- Any WR lvl LESS THAN 16% w/ NO feed flow
While in FR-H.1 “Loss of Secondary Heat Sink”, IF there are LESS THAN two Pzr PORV flow paths open OR CETCs are rising what action is taken
- Initiate Bleed through RVCH vents (NSOs)
What is the preferred order of Secondary Heat Sink
- AFW (own unit)
- AFW (opposite unit)
- MFW
- Condensate if 1 SG is LESS THAN 220 PSIG
What is the primary indication DIFFERENCE that indicates Natural Circulation is established (vs. loss of heat sink)
- Large delta T indicated Natural Circ.
When responding to high SG level, what action is required after NR level comes back on scale
- Evaluation is required prior to releasing steam due to the potential for residual water remaining in the steam lines
If you have an SI, and ECCS is IN SERVICE do you perform FR-I.1 “Response to High Pressurizer Level”
- No, you return to procedure and step in effect at Step 1 RNO
What is the CSFST color for ALL FR-I procedures
- YELLOW
While in FR-I.3 “Response to Voids in Rx Vessel”, what is the purpose of checking RCS pressure LESS THAN 1725# PRIOR to raising RCS Pressure
- To condense any voids present to ensure there are no superheated hard bubbles
While in FR-H.1 “Loss of Secondary Heat Sink” following bleed and feed initiation, AFTER feed flow is restored given the following conditions how are feed flows controlled:
- CETCs are STABLE or LOWERING
- ALL SGs are dry
- Feed ONE SG at LESS THAN 50k pph
- WHEN active SG WR is GREATER THAN 17%, THEN raise FF as desired
While in FR-H.1 “Loss of Secondary Heat Sink” following bleed and feed initiation, AFTER feed flow is restored given the following conditions how are feed flows controlled:
- CETCs are STABLE or LOWERING
- At least ONE SG IS NOT dry
- Feed any SGs that ARE NOT dry as necessary to restore NR level
Given the following conditions which FR-C procedure is entered:
- Lowest CETC GREATER THAN 1200 deg F
- FR-C.1
Given the following conditions which FR-C procedure is entered:
- Lowest CETC is 757 deg F
- RVLIS NR LESS THAN 46%
- FR-C.1
Given the following conditions which FR-C procedure is entered:
- Lowest CETC is 757 deg F
- RVLIS NR GREATER THAN 46%
- FR-C.2
Given the following conditions which FR-C procedure is entered:
- Lowest CETC is 756 deg F
- RVLIS NR LESS THAN 46%
- FR-C.2
If RCPs are running, what temperature can you expect CETCs to be LESS THAN
- 1200 deg F
If entering an FR-C series FRP, what other FRP is expected to be NOT SATISIFED
- FR-I
Which fission product barrier is DIRECTLY challenged by INADEQUATE/DEGRADED Core Cooling
- Fuel Cladding
List the methods for re-establishing Core Cooling IN ORDER from MOST to LEAST effective
- Restore ECCS flow
- Dump Steam from SGs
- Start RCPs
- Vent RCS
What is the major difference between FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition” and FR-P.2 “Response to Anticipated Pressurized Thermal Shock” with regards to the cooldown that is performed
- FR-P.1 has a 50 deg per 60 min limitation on the cooldown
- FR-P.2 has a 100 deg per 60 min limitation on the cooldown
While in FR-C.1 “Response to Inadequate Core Cooling” OR FR-C.2 “Response to Degraded Core Cooling”, WHY is the depressurization STOPPED at 160#
- To ISOLATE Accumulators to prevent N2 from injecting
While in FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition” IF SI Termination Criteria ARE NOT met, what action is taken and why
- Start RCP to mix ECCS flow to minimize thermal stress on vessel
What is the Cold Leg temperature that indicates a need to enter FR-P.1
- 285 deg F
What is the Cold Leg temperature that indicates a need to potentially enter FR-P.2
- 315 deg F
Why is the ECCS termination criteria in FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition” LESS restrictive than “NORMAL” termination criteria
- To limit cooldown and allow for a faster reduction in RCS pressure
What condition is necessary for a PTS concern to exist
- Operator error (failure to terminate SI for greater than 30 mins when conditions are met to do so)
While in FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition”, when does the clock start on the “1 hour soak”
- AFTER temperature is STABLE
- DO NOT LOWER temperature OR RAISE pressure during soak
While in FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition”, what is the cooldown limit after the 1 hour soak period
- 50 deg F in 60 mins
While in FR-P.1 “Response to Imminent Pressurized Thermal Shock Condition”, what action is taken IF RCS pressure is LESS THAN 300#
- Check RHR flow GREATER THAN 400 gpm
- IF YES, THEN return to procedure and step in effect
Is a cooldown or heatup more limiting for Pressurized Thermal Shock AND why
- Cooldown
- Tensile stress on INNER WALL is additive to pressure stress
What is the worst case Pressurized Thermal Shock event
- SBLOCA w/ natural circ. cooldown (i.e., no RCPs running)
Which part of the vessel is MOST susceptible to brittle fracture
- Belt line welds
While in FR-P.2 “Response to Anticipated PTS Condition”, what actions are taken with regards to cooldown
- No soak time is required
- IF cooldown was GREATER THAN 100 deg/60 mins, THEN restore cooldown rate to LESS THAN 100 deg/60 mins
What factors were considered in the development of the Pressurized Thermal Shock curve
- Pressurized Thermal Shock
- LTOP
- RCS Safety Valves
While in FR-P.2 “Response to Anticipated PTS Condition”, if ECCS is in service what actions is taken AND WHY
- Return to procedure and step in effect
- There are higher priorities if SI has not been terminated prior to entering FR-P.2
