Containment

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Author:
skrappie1
ID:
115445
Filename:
Containment
Updated:
2015-11-17 13:01:30
Tags:
containment advanced systems
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containment
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  1. What are the sources of energy available to be released to the containment building?
    • NSSS stored heat
    • Rx core decay heat
    • Metal-water reactions
    • Hydrogen combustion
  2. What are the hydrogen generation sources?
    • Zirconium/water reactions
    • Radiolytic decomposition of water
    • Structural zinc and aluminum corrosion when exposed to CSS water at high temperature
    • Hydrogen overpressure in the VCT for chemistry control
  3. How is containment pressure controlled?
    Containment pressure is maintained by venting to the stack via CWRT-64D to radwaste exhauster V-14A/B plenum or the VGCH.
  4. What is the purpose of the sodium tetraborate decahydrate baskets?
    • Buffers pH to approximately 7.0
    • Reduces the amount of Iodine
    • 20 baskets
    • -8600-9000 lbs NaTB total
  5. LCO 3.6.2 Containment Air Locks
    LCO 3.6.2 Two containment air locks shall be OPERABLE.

    • APPLICABILITY: MODES 1, 2, 3, and 4.
    • ------------------NOTES--------------------
    • 1. Entry and exit is permissible through a “locked” air lock door to perform repairs on the affected air lock components.
    • 2. Separate Condition entry is allowed for each air lock.
    • 3. Enter applicable Conditions and Required Actions of LCO 3.6.1, "Containment," when leakage results in exceeding the overall containment leakage rate acceptance criteria.

    • ACTIONS:
    • A. One or more containment air locks with one containment air lock door
    • inoperable.
    • -----------------NOTES----------------
    • 1. Required Actions A.1, A.2, and A.3 are not applicable if both doors in the same air lock are inoperable and condition C is entered.
    • 2. Entry and exit is permissible for 7 days under administrative controls if
    • both air locks are inoperable.
    • -A.1 Verify the OPERABLE door is closed in the affected air lock. 1 HOUR
    • B. One or more containment air locks with containment air lock interlock
    • mechanism inoperable.
    • ------------------NOTES----------------
    • 1. Required Actions B.1, B.2, and B.3 are not applicable if both doors in the same air lock are inoperable and Condition C is entered.
    • 2. Entry and exit of containment is permissible under the control of a dedicated individual.
    • -B.1 Verify an OPERABLE door is closed in the affected air lock. 1 HOUR
    • C. One or more containment air locks inoperable for reasons other than Condition A or B.
    • -C.1 Initiate action to evaluate overall containment leakage rate per LCO 3.6.1. IMMEDIATELY
    • AND
    • -C.2 Verify a door is closed in the affected air lock. 1 HOUR
  6. LCO 3.6.3 Containment Isolation Valves
    LCO 3.6.3 Each containment isolation valve shall be OPERABLE.

    • APPLICABILITY: MODES 1, 2, 3, and 4.
    • -------------NOTES-------------------------
    • 1. Penetration flow paths, except for 8 inch purge exhaust valves and 12 inch air room supply valves penetration flow paths, may be unisolated intermittently under administrative controls.
    • 2. Separate Condition entry is allowed for each penetration flow path.
    • 3. Enter applicable Conditions and Required Actions for system(s) made inoperable by containment isolation valves.
    • 4. Enter applicable Conditions and Required Actions of LCO 3.6.1, "Containment," when leakage results in exceeding the overall containment leakage rate acceptance criteria.

    ACTIONS:

    • B. --------------NOTE-------------
    • Only applicable to penetration flow paths with two containment isolation valves.
    • -----------------------------------
    • One or more penetration flow paths with two containment isolation valves inoperable (except for purge exhaust valve or air room supply valve not locked closed).
    • -B.1 Isolate the affected penetration flow path by use of at least one
    • closed and de-activated automatic valve, closed manual valve, or blind
    • flange. 1 HOUR

    • D. One or more purge exhaust or air room supply valves not locked closed.
    • -D.1 Lock closed the affected valves. 1 HOUR
  7. LCO 3.9.3 Containment Penetrations
    LCO 3.9.3 The containment penetrations shall be in the following status:

    • a. The equipment hatch closed and held in place by four bolts;
    • -----------------NOTE-----------------------
    • The equipment hatch is only required to be closed when the Fuel Handling Area Ventilation System is not in compliance with LCO 3.7.12, "Fuel Handling Area Ventilation System."
    • b. One door in the personnel air lock closed;
    • ------------------NOTE----------------------
    • One door in the personnel air lock is only required to be closed when the equipment hatch is closed.
    • c. One door in the emergency air lock closed; and
    • d. Each penetration providing direct access from the containment atmosphere to the outside atmosphere either:
    • 1. closed by a manual or automatic isolation valve, blind flange, or equivalent, or
    • 2. capable of being closed by an OPERABLE Refueling Containment High Radiation Initiation signal.

    • APPLICABILITY: During CORE ALTERATIONS,
    • During movement of irradiated fuel assemblies within containment.

    • ACTIONS:
    • A. One or more containment penetrations not in required status.
    • -A.1 Suspend CORE ALTERATIONS. IMMEDIATELY
    • AND
    • -A.2 Suspend movement of irradiated fuel assemblies within containment. IMMEDIATELY
  8. What is the design basis of the containment building?
    • Capable of withstanding the internal pressure resulting from the design basis accident (DBA) with no loss of integrity
    • Containment building is designed to allow a leak rate of no more than 0.1 weight-percent/day at a design pressure of 55 psig and a design temperature of 283oF
  9. What must be true for active containment isolation valves (check valves) to be considered operable?
    • Must have isolation stroke times within limits
    • Must be able to actuate upon reciept of a CHP or CHR signal
    • Must pass a periodic leakage rate test
  10. What is the purpose of the containment hydrogen monitoring system?
    Provides continuous monitoring of the containment for hydrogen concentration, when placed in service in a post accident situation.
  11. LCO 3.5.5 Containment Sump Buffering Agent and Weight Requirements
    • LCO 3.5.5 Buffer baskets shall contain ≥ 8,186 lbs and ≤10,553 lbs of Sodium
    • Tetraborate Decahydrate (STB) Na2B4O7 · 10H2O.

    APPLICABILITY: MODES 1, 2, and 3.

    NO </= 1 HOUR ACTIONS
  12. What must be true for passive containment isolation valves (manual valves, deactivated closed auto valves, blind flanges, and closed systems) to be considered operable?
    • Must be closed and locked (manual valves)
    • Must pass a periodic leakage rate test
  13. What causes an automatic containment isolation?
    • CHP 3.7-4.3 psig
    • CHR 10 R/hr
    • Refueling monitors
    • -setpoint determined by Rad Pro

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