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LOIT GOP JH 2018 > Reduced Inventory > Flashcards

Reduced Inventory Flashcards

1
Q

What is 10% PZR Level? And MINIMUM RCS Level allowed?

A

10% = 117’

MINIMUM allowed = 101’6”

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2
Q

What is “Partially Drained” elevations?

A

<10% PZR Level or 114’ - 117’

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3
Q

What is “Lowered Inventory” elevations?

A

Equal or Less than RX Vessel Flange Level

111’ - 114’

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4
Q

What is “Reduced Inventory” elevations?

A

103’1” - 111’ (with fuel in RX Vessel)

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5
Q

What are “Mid-Loop” elevations?

A

101’6” - 103’1” (with fuel in RX Vessel)

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6
Q

Define “Vortexing”

A

Whirlpool effect on water at SDC pump suction at RCS Hot Leg

Caused by low RCS Levels and HIGH SDC Flow

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7
Q

What is a “Level Change”?

A

Deliberate or inadvertent actions that result in change in RCS inventory. (Changes from Temperature are NOT Level Changes)

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8
Q

Define “Bulk Temperature”

A

Actual Temperature in Core.

Indicated at CET’s with no RCS flow or SDC HX Inlet

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9
Q

What is “Decay Heat”?

A

Generated from beta/gamma decay of fission products in core

Depends on power level of core operation and length of time at power

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10
Q

What does the Safety Operational Data Manual provide?

A

SAOD has guidance, time lines and tables to help determine core parameters vs time since RX shutdown

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11
Q

During RCS drain down, what are allowed RCS flow rates?

A

> 107’ = 3780 - 5000 GPM
102’ - 103’1” = 3780 - 4600 GPM
101’6” - 102’ = 3780 - 4150 GPM

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12
Q

What is definition of “Normal SDC Flow”?

A

By TS, 3780 - 5000 GPM

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13
Q

What flow rate is administratively NOT allowed during Mid-Loop operations?

A

SDC Flow > 4150 GPM

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14
Q

Can we use a CS pump to supply SDC if RCS level is in the Hot Leg (Equal or less than 103’1”)?

A

NO

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15
Q

What critical parameters should be monitored during RCS Drain Operations?

A

Water Inventory (Level)
Water Temperature IN/OUT of SDC HX
SDC Pump Amps and Flow

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16
Q

When do we have to calibrate BOTH trains of RWLIS?

A

Anytime RCS is at Reduced Inventory or Mid-Loop

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17
Q

During Mid-Loop how is Level primarily indicated?

A

HJTC’s in RVLMS and RWLIS systems

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18
Q

Where can CET Temperatures be read from?

A

Locally at QSPDS cabinet or;

Core Map screen of QSPDS in Control Room

19
Q

What are the SDC Flow alarms for 1 pump and 2 pump operation?

A

1 pump = 3615 GPM

2 pump = 7400 GPM

20
Q

Who allows continued drain down operations if Maximum allowable level deviations are exceeded?

A

Ops Department Leader

21
Q

How many trains of RWLIS shall be calibrated and In-Service anytime RCS is in Partial Drain condition?

A

1

22
Q

What are the power sources for the RWLIS instruments?

A

NNN-D11/D12, with flow compensation power from PNA-D25 and PNB-D26

23
Q

During a Level Change, what type of monitoring is performed and periodicity of recording level is?

A

Continous Local Monitoring

Level every 15 minutes

24
Q

If RCS Level can’t be displayed in the CR by any means, what is done for level?

A

Monitored Locally and Recorded at least once every 15 minutes

25
Q

What are the 3 flow paths for draining the RCS for Mid-Loop?

A

Normal CVCS to RWT
Normal CVCS to HUT
Alternate SI 6” bypass line

NOTE: Can’t simultaneously use more than 1 path

26
Q

At what elevation would the SG U-tubes begin to drain?

A

< 103’1” WR

27
Q

What is the Max Drain Rate with fuel in the RX?

A

Using Head Vent = 40 GPM

Using Greylock Hubs = 135 GPM

28
Q

What are the makeup flow paths required during reduced inventory (3)?

A

Must have 2 independent paths
Gravity MU path at all times
Gravity and HPSI MU must be on opposite trains

29
Q

What is “Surge Line Flooding”?

A

Boiling occurs. Steam velocity in 12” surge line, doesn’t allow water to drain back from PZR into RCS.

30
Q

What are the SM duties during Reduced Inventory per 40OP-9ZZ30?

A

Authorize CTMT Hatch open >111’
Gets UDL approval to Open <111’
Authorize CTMT penetration open
Determine Closed CTMT conditions
Direct MLOC to implement CTMT closure
Ensure RE on Open CTMT log are notified of closure
Review Work Orders on RCS level perturbations
Notify U1 SM of entry/exit into Reduced Inventory
Notify Outage MGMT entry/exit into Red Inventory

31
Q

What is “Closed Containment”?

A

At least 1 integral barrier to release of Rad material

32
Q

Who maintains the status of penetrations via the CTMT penetration work log?

A

Work Control

33
Q

Who determines the status of all penetrations and establishes the Open CTMT Penetration Log (OCPL)?

A

MLOC (Mid-Loop Ops Coordinator)

34
Q

All CTMT penetrations, including the Equipment Hatch must be capable of closed by Time core boiling starts after loss of SDC or within ___

A

60 minutes (whichever is more limiting)

35
Q

Prior to draining to Reduced Inventory, what must we do with the Equipment Hatch?

A

Close it

36
Q

What must be the TTB in order to Open the Hatch after closing for Reduced Inventory?

A

TTB shall be > 30 minutes

37
Q

How long do we assume it take to close the Equipment Hatch?

A

30 minutes

Secured with at least 4 bolts

38
Q

Who reviews work on systems that have potential to affect SDC capability or loss of SDC impacts?

A

MLOC (or designee)
Ops SM

NOTE: Potential to cause RCS PERTURBATIONS

39
Q

Short lived fission products decay away in how long?

A

~ 20 days

40
Q

What are the most important SAOD curves associated with mid-loop ops?

A

TTB
Core HU rates
Time to core uncover during mid-loop

41
Q

How many CET’s are required PRIOR to entering reduced inventory or mid-loop?

A

Minimum of 2 CET’s

42
Q

What is normally selected for the Refueling Water Level Alarm Enable selector switch?

A

BOTH

43
Q

During reduced inventory, how is HPSI used for as MU source?

A

Cold Leg intact - HPSI in standby for non-gravity MU

Cold Leg NOT intact - HPSI aligned to HL MU

LOIT GOP JH 2018 (19 decks)

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