3903 (7/8/14 - 7/11/14) Flashcards
Describe the mitigation strategies for Beyond Design Basis External Events.
- Focus is on maintaining or restoring key plant safety functions
- The underlying strategies for coping with these conditions involve a three-phase approach.
State the three key safety functions the FLEX strategies are designed to protect.
- Core Cooling
- Spent Fuel Pit Cooling
- Containment Cooling (Containment Functionality)
Explain the three phases of FLEX coping and associated time frames.
- Phase 1: Use of installed equipment.
- Phase 2: Use of onsite FLEX equipment.
- Phase 3: Use of offsite FLEX equipment.
Differentiate between an extended loss of AC Power (ELAP) and a loss of offsite Power (LOOP).
- LOOP – EDGs and/or Supplemental Diesels are available
- ELAP – All AC power is lost and will not be restored for >4 hours.
Discuss the assumptions regarding external events and plant conditions that provide the basis for FLEX strategies.
- Beyond-design-basis external event occurs impacting all units at site.
- Both Unit’s reactors on-site are initially operating at power
- Each reactor is successfully shut down when required (i.e., all rods inserted, no ATWS or other concurrent event).
- On-site staff is at site administrative minimum shift staffing levels.
- No independent, concurrent events, e.g., no active security threat.
- All personnel on-site are available to support site response.
- Spent fuel in dry storage is outside the scope of FLEX.
Discuss the relationship between FLEX Support Guidelines and the Emergency Operating Procedures.
FLEX Support Guidelines (FSG’s) are entered from the Emergency Operating Procedures and provide support for actions required by the Emergency Operating Procedures such as:
Power for Instrumentation
Water for Cooling
Boric acid to maintain subcriticality
Describe the hierarchy of and relationship between the levels of procedures used to respond to a Beyond Design Basis External Event.
- FLEX Parent Guidelines: Normally entered from ECA 0.0, determines strategy and directs the implementation of FLEX Deployment Guidelines.
- FLEX Deployment Guidelines: Provide direction for configuring, aligning and operating equipment in the field; directs the implementation of FLEX Equipment Operation Guidelines.
- FLEX Equipment Operation Guidelines: Contain detailed equipment precautions, startup, operation, and shutdown Guidelines.
Describe the Water flow path used during FLEX strategies to protect the fuel from damage.
During Phases 1&2 the TDAFP (aligned to the CST/Opposite CST, Lake Township via a Hydrant, Fire Water Storage Tank via the Fire Protection Pumps or Lake Michigan via the onsite FLEX Pumps) will be used until pressure is too low to spin the TDAFP. SGs 1&4 will be fed through a new connection (not yet installed) in the MDAFP Room while SGs 2&3 will be fed through the existing B.5.B connection.
While in Phase 3 we will reestablish ESW using the RRC Raw Water Pump to supply 5000 gpm. Then we will place the CCW & RHR systems in service.
Describe the Electrical Flow path(s) used during FLEX strategies to protect the fuel from damage.
Initially we will attempt to establish power to the 11B & 11D (through crosstie breaker from 11D to 11B) 600 VAC buses using temporary cables and a 500KW Generator.
If that strategy fails we have a 250KW generator to power the MCC for Boric acid pumps, N Train loads, and Hydrogen igniters. The same 250KW generator will supply power to the Accumulator Outlet Valves and the CRIDs (via the Isolimiter Transformers). There are also 4 6.5KW Generators to supply power to the CRIDs (via the Isolimiter Transformers).
During Phase 3 the RRC provides two 1MW Gas Turbine Generators to supply 4Kv power to Bus 1A (Train B), T11A, 11A and 11C, Battery Chargers, CEQ fan, RHR pump, CCW pump, NESW pump, and CR Ventilation.
Describe the FLEX equipment available on site used for the FLEX guidelines.
- FLEX Building (New structure by the TSOC) contains: Two trucks, one with a snow plow for debris removal, FLEX pumps, generators, transformers, trailers with electrical cables and hoses, portable lighting, tool and other items needed for debris removal. “Mules” (Tank trailers) with fuel for equipment also stored here.
- Two loaders will be dispersed on site.
- Aux Building: FLEX boric acid pumps and hoses stored on 597’, other tools, manifolds, and equipment in will be stored in FLEX storage boxes.
- Turbine building: Fire hose and carts in the 591’ Fire Cage along with other tools and equipment in FLEX storage boxes.
- Fire Protection Pump House: Hoses and required manifold along with other tools and equipment in designated storage boxes.
State the objective of the Cook Nuclear Emergency Plan.
The Cook Nuclear Plant Emergency Plan has the fundamental objective of protecting: the health and safety of the general public, persons temporarily visiting or assigned to the reactor facility and employees of the plant.
Describe the responsibility of the Control Room Offsite Communicator.
- Set up the Emergency Plan telephones as required.
- Notify MSP & BCSD within 15 minutes (At an Alert level or higher).
- Provide information from EMD-32 form approved by the SEC to offsite agencies.
- Request callback for authentication.
- Fax EMD-32 forms following SEC approval (And every 30 minutes thereafter).
- Provide the NRC with information on the Plant Status Data Sheet ASAP.
Descbribe the information transmitted to offsite agencies by the Control Room Offsite Communicator.
The AEOs provide information from EMD-32 & Data Sheet 4 the SEC has approved for communications to offsite agencies.
Describe the process for the transmission of information to outside agencies.
- Inform agency that the EMD-32 will be faxed.
- Request callback for authentication.
- Fax EMD-32 form following approval by the SEC.
