Purge and Vent Flashcards Preview

Systems > Purge and Vent > Flashcards

Flashcards in Purge and Vent Deck (54):
1

What is the purpose of the Radwaste Area HVAC System?

The Radwaste Area HVAC System supplies filtered and heated (as necessary) outside air to the radioactive waste processing areas of the Auxiliary Building and those spaces currently used by health physics personnel at Access Control.

2

What is the purpose of the Engineered Safeguards Room HVAC System?

The Engineered Safeguards Room HVAC System circulates cool air in the ESS Rooms under conditions of abnormally high temperature in these spaces in order to cool the ESS Rooms and contained equipment.

Supply air for each Engineered Safeguards (ESS) Rooms is provided from the Radwaste Area HVAC System to the ES Rooms via PO-1812 and 1817.

3

What is the purpose of the Auxiliary Building Addition Radwaste Area HVAC System?

The Auxiliary Building Addition Radwaste Area HVAC System supplies filtered and heated (as necessary) outside air to the radioactive waste processing areas of the Auxiliary Building Addition Radwaste Area.

4

What is the purpose of the Fuel Handling Area HVAC System?

The Fuel Handling Area HVAC System supplies filtered and heated (as necessary) outside air to the fuel pool area and adjacent spaces, in order to permit personnel access and to control airborne radioactivity in the area during normal operation.

The Fuel Handling Area HVAC System also limits site boundary radiation doses during a fuel cask drop or other fuel handling accident scenarios.

5

What is the purpose of the Auxiliary Building Addition Fuel Handling Area HVAC System?

The Auxiliary Building Addition Fuel Handling Area HVAC System supplies filtered and heated (as necessary) outside air to the fuel pool area and several adjacent areas at the same level and the next lower level, in order to permit personnel access and to control airborne radioactivity in the area during normal operation

6

What is the purpose of the Penetration and Fan Room HVAC System?

The Penetration and Fan Room HVAC System supplies filtered outside air to the area where the main feedwater and main steam piping penetrate containment.

7

What is the purpose of the Containment Purge System?

The Containment Purge System provides suitable ventilation to containment during shutdown conditions.

8

What is the purpose of the Main Exhaust System?

The Main Exhaust System provides suitable ventilation conditions for exhausting air from the Auxiliary Building and Containment HVAC Systems to the main exhaust stack (i.e., negative pressure in the exhaust plenum).

9

What is the general purpose of each radiologically controlled areas ventilation system?

  • Provides a suitable environment for equipment and personnel.
  • The airflow runs from areas of low radioactivity toward areas of progressively higher activity for ultimate discharge from the Plant via the main exhaust stack.
  • The exhaust air is ducted to HEPA filters:
    • to assure minimum radioactivity levels for the main exhaust stack discharge, and
    • to maintain containment of radioactive particles in those areas of possible contamination
  • The design exhaust flow exceeds the supply exhaust flow in order to create a negative pressure in the areas served and thus minimize the release of radioactive contamination.

10

What is the flowpath via major components of the Radwaste Area HVAC system?

Intake via supply fan V-10

  • Inlet damper PO-3010
  • pre-filter VF-10
  • preheat coil VHX-10
  • reheat coil VHX-13 to the suction of the fan.

Split into 2 major air supply headers

  • One supplies air to offices, lockers, showers, and counting labs via heating coil VHX-38 and cooling coil VHX-52, cooled by chill water.
  • The other header provides air via isolation damper PO-1809 to potentially contaminated areas that contain radwaste treatment equipment.  A
    • Also provides air to the ESS Rooms through dampers PO-1817 (east) and PO-1812 (west).

V-14A/B, Radwaste Area HVAC Exhausters

  • Return air is exhausted to the main exhaust plenum after passing through a filter unit and then the exhast fans.
  • CWRT T-64D vent path for containment purge connects at the inlet to the filter unit
  • Radiation monitor RIA-1809 monitors radwaste exhaust filters inlet plenum and provides for system isolation on high radioactivity.

11

What interlocks are associated with V-10, Radwaste Area Supply Fan?

RIA-1809 trips V-10 on a high rad alarm

V-14A/B (one is always in standby which means running) trips with V-10

  • Not needed to maintain negative pressure, unless it is only fan running.
  • If airflow drops, standby fan will restart.

12

What is the function and location Radwaste Ventilation Radiation Monitor RIA-1809?

Radwaste Ventilation Radiation Monitor RIA-1809

Reset Pushbutton on C-13

  • Located at inlet plenum to V-14A/B
  • Trips V-10
  • Trips closed East & North Corridor Supply Damper PO-1809
    • HS on C-03

13

What are the controls and indications for V-10 and V-14A/B

Supply fan V-10

  • CLOSE/TRIP switch (spring return to center position) on C-13.
  • Freen/Red fan stopped/running lights at fan control switch
  • Amber light at control switch has no function

Exhaust fans V-14A/B

  • CLOSE/TRIP/ switch (spring return to center position) on C-13
  • Close/Open flag at fan control switches.
  • Standby fan select switch on C-13 selects either V‑14A or V-14B as the standby fan

14

What precautions and limitations does SOP-24 have for the Radwaste Area HVAC system?

  • At least one V-14A/B fan is required to ensure adequate sampling of rad monitors and to prevent potential radiological contamination of personnel in the Chemistry sampling area using affected fume hoods.
  • V-10, V-14A and B should be on if the equipment hatch is open.
  • Do not remove V-10 and V-67 (Aux Bldg. Addition Radwaste Area supply fan) from service at the same time because Aux Building ventilation imbalances will result.
  • V-10 and V-14A/B are stopped during V-6A/B transfer to minimize backpressure on exhaust plenum when both V-6A/B are off, which could cause reverse flow through filters and a resultant release of radioactivity (e.g., VF-66 or VF-58).

15

How is the Radwaste HVAC system started and stopped?

Startup

  • Verify RIA-1809 in service, alarm cleared, and damper high rad isolation reset.
  • One V-14A or B fan is started, then V-10 is started followed by the other V-14 fan. (Notify Chemistry prior to starting V-14A/B fans if both were off per SOP-24, 8.3.2)
  • Steam heating is provided, if needed

Shutdown

  • Notify Chemistry prior to stopping both V-14A & B (per SOP-24, 8.3.1).
  • V-14A or B is stopped and then V-10 is stopped.
  • Remaining V-14 fan is stopped.

16

Is the Engineered Safeguards Room HVAC safety related?

Yes.

The safety-related (Q) components in the ESS Room HVAC System are ESS Room coolers, fans, motors, controls, and ceiling mounts.

  • Service water piping and control valves for ESS Room coolers.
  • ESS Room isolation dampers, damper positioners, and isolation signals

V-27A/D are not safety related nor required for Tech Specs.

17

What is the design function of the ESG room coolers?

The ESS Room coolers are designed to limit the temperature in the ESS Rooms to 135°F during a LOCA

18

What supplies fresh air to the ESG rooms?

Where does it exhaust?

What closes them?

Radwaste Area HVAC system through

  • PO-1817 - East Safeguards Supply Damper
  • PO-1812 - West Safeguards Supply Damper

Exhaust to Radwaste Area HVAC system through.

  • PO-1810 - East Safeguards Supply Damper
  • PO-1811 - West Safeguards Supply Damper

RIA-1810 isolates East Safeguards Dampers

RIA-1811 isolates West Safeguards Dampers

19

Where and what are the damper controls for PO-1810, 1817, 1811 and 1812?

CLOSE/OPEN/OVERRIDE TO OPEN switch for PO‑1810, PO-1817 (EAST), and PO-1811, PO-1812 (West) on C-03 AND C-33

Key lock switch – one for each set of dampers

  • HS-1810A for PO-1810 & 1817
  • HS-1811A for PO-1811 & 1812

Red/Amber/Green indicator lights – Amber lights are lit when the associated control switch on C‑33 is NOT in remote OR when HS-1810A/1811A is in the OVERRIDE TO OPEN position

20

What are the power supplies to V-27A/B/C/D?

MCC-1

  • V-27A - East Engineering Safeguards Cooler Fan
  • V-27C - West Engineering Safeguards Cooler Fan

MCC-2

  • V-27B - East Engineering Safeguards Cooler Fan
  • V-27D - West Engineering Safeguards Cooler Fan

21

At what temperatures do the V-27 fans start and stop?

STANDBY - 90°F

AUTO - 85°F

22

When do East Room dampers PO-1817 and PO-1810 automatically close?

East Room dampers PO-1817 and PO-1810 automatically close on RIA-1810 high rad alarm at 90% of scale.

23

When do West Room dampers PO-1811 and PO-1812 automatically close?

West Room dampers PO-1811 and PO-1812 automatically close on RIA-1811 high rad alarm at 90% of scale

24

What are the V-27 control room controls and indications?

ESS Room fans V-27A/B/C/D

  • HAND/STANDBY/AUTO/PULL-TO-LOCK switch for each fan on C-13
  • HAND – Starts fan
  • AUTO - Fan starts at 85°F ESS Room temp.
  • STANDBY – Fan starts at 90°F ESS Room temp.
  • PULL-TO-LOCK stops fan and disables start.
  • Green/Red fan stopped/running lights at fan control switch

25

What are the ESS Room Damper Controls and indications in the control room?

CLOSE/OPEN/OVERRIDE TO OPEN switch for PO‑1810, PO-1817 (EAST), and PO-1811, PO-1812 (West) on C-03 AND C-33

Key lock switch – one for each set of dampers

  • HS-1810A for PO-1810 & 1817
  • HS-1811A for PO-1811 & 1812

Red/Amber/Green indicator lights – Amber lights are lit when the associated control switch on C‑33 is NOT in remote OR when HS-1810A/1811A is in the OVERRIDE TO OPEN position.

OVERRIDE TO OPEN will over-ride the high rad alarm and open the associated dampers.

26

What does Radwaste Area High Rad Isolation Reset Pushbutton on C-03 do?

Radwaste Area High Rad Isolation Reset Pushbutton on C-03

Resets the high rad lock-in relay provided that the high rad alarm on RIA-1810/ RIA-1811 has cleared

Resets and opens PO-1810, PO-1817, PO‑1811, and PO-1812

27

What controls and indications are in the control room for the V-27 service water supply valves?

ESS Room coolers Service Water Supply Valves CV‑0825, CV-0878 (fail open)

Key-locked CLOSE/OPEN switch for each valve on C-08 (HS-0825A & HS-0878A) AND C-33

Red/Green indicating lights at switches

C-33 Switches cannot override Control Room key locked switches HS‑0825A or HS-0878A to close the valves

28

What temperature indications associated with V-27's are in the control room?

East and West ESS Room Cooler Air Outlet Temperature TI-0869 and TI-0870 on panel C-13

29

What service water supplies VHX-27A (East) with service water?

What service water supplies VHX-27B (West) with service water?

VHX-27A (East) from ‘A’ Header

VHX-27B (West) from ‘B’ Header

30

What make an ESG room cooler Operable?

An ESS Room cooler is considered operable if Service Water flow is available and the associated fan is operable.

  • East ESS Room cooler fan V-27B
  • West ESS Room cooler fan V-27C

If the associated ESS Room cooler or fan powered from the same EDG as the pump is declared inoperable, then the HPSI and CS pumps shall be declared inoperable

31

What are ESG Room Temperature Limits per the SOP?

Temperatures in each ESS Room shall be ≥50°F and ≤95°F.

  • If ≤42°F, then components in the ESS Room shall be declared inoperable
  • If <68°F, then air system low points drains shall be blown down more frequently due to elevated moisture. (SOP-24)

32

What is required for operation with either RIA-1810 or 1811 inoperable?

Operation with either RIA-1810 or 1811 inoperable

If either channel fails low or is otherwise inoperable, the ventilation dampers associated with that channel shall be closed IMMEDIATELY.

Action shall be taken to have the affected channel repaired. 

The dampers associated with the channel shall not be opened until the affected channel has been declared operable.

33

Supply Fan V-67 supplies what and is interlocked with what?

Supply Fan V-67

Supplies Auxiliary Building Addition Radwaste Area

D-1 (PO-8006) opens/closes automatically when V-67 starts/stops

Exhaust fan V‑68A or V‑68B selected for standby trips when supply fan V‑67 trips (unless the V‑68 fan selected in “Standby” is the only exhaust fan operating)

34

RIA-5711

RIA-5711, Radwaste Area

High rad alarm (1.0 E+4 cpm)

Trips V-67, which trips the V-68A/B selected for standby to minimize the spread of radioactive contamination.

35

Outlet Dampers PO-1816A/B

Outlet Dampers PO-1816A/B

  • PO-1816A opens/closes automatically when V-68A starts/stops
  • PO-1816B opens/closes automatically when V-68B starts/stops
  • Automatically close on High Rad on RIA-5711 when associated fan V-68A/B trips.  Will reopen if associated fan(s) restarts on low flow

36

Aux Radwaste HVAC Controls and Indications

Aux Radwaste HVAC Controls and Indications

C-125

  • V-67, Supply
    • CLOSE/TRIP switch
    • Green/Red
  • V-68A/B, Exhaust
    • CLOSE/TRIP
    • Standby fan select switch on C-125 selects either V‑68A or V-68B as the standby fan

37

Auxiliary Building Addition Radwaste Area HVAC System SOP-24 Requirements

Auxiliary Building Addition Radwaste Area HVAC System SOP-24 Requirements

  • V-67, V-68A and B should be on if the equipment hatch is open
  • Removing both V-68A and B from service at the same time could result in potential radiological contamination of personnel in the Chemistry Sampling Area using affected fume hoods (per SOP-24, 8.3)

38

Fuel Handling Area HVAC System Safety Related Components

Fuel Handling Area HVAC System Safety Related Components

1.      Charcoal Filter VF-66

2.      Dampers D-977/978 and associated positioners

3.      Pre-filter VF-68 and HEPA filter VF-67

4.      Exhaust fans V-8A/B

39

What is the use of the Fuel Handling Area Charcoal Filters?

To meet 10 CFR 100 criteria, the charcoal filter is only needed for a postulated fuel cask drop when irradiated fuel in the fuel pool has decayed less than 90 days.

For postulated fuel handling accidents, the charcoal filter is not needed to meet 10 CFR 100 criteria

Used during refueling operations to limit site boundary doses in the event of a fuel cask drop or other refueling accident. (Mainly Iodine removal)

40

What supplies the fuel handling area?

Supply fan V-7 supplies filtered and heated air at a temperature of 60°F at the outlet of heating coils VHX-7A/B

41

What exhausts the fuel handling area?

V-8A/B

  • 50% capacity each. 
  • Both on

Filters Upstream of Fans

  • Filter unit VF-8 and VF-58 consists of pre-filter and a HEPA filter, respectively.
  • Filter unit VF-68, VF-67, and VF-66 consists of a pre-filter, HEPA filter, and a charcoal filter, respectively

42

How do D-977 and 978 control the charcoal filter lineup?

Dampers D-977 and D-978 control the filter lineup

Normal operation

  • D-977 is open and D-978 is closed
  • Isolates the charcoal filter unit.

During refueling (emergency) operation

  • D-977 is closed and D-978 is open
  • Places the charcoal filter unit is operation

HS-1894 controls the position of dampers

Interlocked such that only one flow path can be in effect at any time.

43

V-8A/B power supplies?

V-8A/B power supplies

  • V-8A powered from MCC-7
  • V-8B powered from MCC-8

Only one fan is operated during a fuel cask drop because of the design flow rate for the charcoal filter

44

Charcoal Filter VF-66 Elapsed Time Indicator

Charcoal Filter VF-66 Elapsed Time Indicator

Located inside panel C-125 (access from back)

45

RIA-2313 on C-11 back and RIA-5709 on C-115 Alarms

RIA-2313 on C-11 back and RIA-5709 on C-115 Alarms

On high alarm on either of these rad monitors

  • Stop fan V-7
  • Place Fuel Handling Fan and Damper Emergency Trip switch HS-1893 in EMERGENCY TRIP
  • If in refueling operations go to AOP-34

46

T.S. 3.7.12 Fuel Handling Area HVAC System

T.S. 3.7.12 Fuel Handling Area HVAC System

The Fuel Handling Area Ventilation System shall be operable with one exhaust fan aligned to the emergency filter bank and in operation

Applicability

During movement of irradiated fuel assemblies in the FH Building when irradiated fuel assemblies with <30 days decay time are in the FH Building.

During movement of irradiated fuel assemblies in containment when irradiated fuel assemblies with <30 days decay time are in containment with the equipment hatch open

During movement of a fuel cask in or over the SFP when irradiated fuel assemblies with <90 days decay time are in the FH Building

During CORE ALTERATIONS when irradiated fuel assemblies with <30 days decay time are in containment with the equipment hatch open

47

What is the T.S. Basis for 3.7.12 Fuel Handling Area HVAC System

T.S. Basis for 3.7.12 Fuel Handling Area HVAC System

The FH HVAC System limits site boundary radiation doses (10 CFR 100) during a cask drop or other fuel handling accident scenarios.

  • Accident analysis shows that to meet 10 CFR 100 criteria, the charcoal filter is only needed for a postulated fuel cask drop when irradiated fuel in the fuel pool has decayed less than 90 days.
  • For postulated fuel handling accidents, the charcoal filter is not needed to meet 10 CFR 100 criteria.
  • The LCO is based upon having a FH HVAC System immediately available in the event of a cask drop or fuel handling accident.

48

What makes Fuel Handling area HVAC operable?

Fuel Handling area HVAC operable

  • One exhaust fan aligned to the emergency filter bank to discharge air to the main exhaust plenum.
  • HEPA filter and charcoal filter are not excessively restricting flow and capable of performing their filtration functions,
  • Duct work and dampers are operable and air circulation can be maintained, and
  • The “normal” filter bank flow path is isolated.

49

V-8A/B Trips, what do you do?

V-8A/B Trips, what do you do?

IF Fuel Handling Area Exhauster V-8A or V‑8B is stopped, THEN Fuel Handling Area Supply Fan V-7 should be stopped

50

What door alignment supports VF-66 Operability?

SFP Area

  • Hatch covers are closed

OR

  • The Track alley rollup door is closed and ALL doors around track alley are NOT blocked open (normal use of doors around track alley for personnel passage is permitted)

Door 280 (to LCC 81/82 room) is NOT blocked open

Door 933, SFP Building Roof Hatch (located above Track Alley Hatch) visually verified closed.

51

Auxiliary Building Addition Fuel Handling Area HVAC

Auxiliary Building Addition Fuel Handling Area HVAC

Supply Fan V-69

  • Heated air at a temperature of 60°F at the outlet of heat coils VHX-65 and 66.

Both 50% exhaust fans V-70A/B normally operate

The filter unit removes radioactive particles from the exhaust air prior to being delivered to the main exhaust plenum for release through the main stack.

52

AB Addition Refuel Interlocks

AB Addition Refuel Interlocks

Supply damper D-1 (PO-8001) opens/closes automatically when V-69 starts/stops

The exhaust fan V‑70A or V‑70B selected for standby trips when supply fan V‑69 trips - unless only one operating

The Fuel Handling Fan & Damper Emergency Trip switch HS-1893 on panel C-125 will trip V-69 and both V-70A/B.

a.      RIA-5712 trips V-69 on a high rad alarm (1.0 E+4 cpm) to minimize the spread of radioactive contamination. (which in turn trips the associated damper and the V-70A/B selected for standby)

53

HS-1893 on panel C-125

HS-1893 on panel C-125

Two positions: NORM and EMERG TRIP

NORM

  • Opens PO-8005 and PO-1810A/B.
  • Closes start permissive contacts in starting circuits for V-69 and V-70A/B

EMERG TRIP

  • Trips fans V-69 and V-70A/B
  • Closes supply fan damper PO-8005.
  • Closes exhaust filter inlet dampers PO-8010A/B

54

Describe the operation of the Fuel Handling Fan and Damper Emergency Trip Switch HS-1893 and the conditions under which it would be used.

For a fuel handling accident, AOP-34 directs that the V-69, V-70A and V-70B fans be stopped to isolate the Aux Bldg. Addition FH Area HVAC System.