LOT 202.38 FHB HVAC

Question 1

• LOT 202.38 FHB HVAC*
• • *

What will happen on a FHB HVAC Emergency Operating Actuation Signal?

Answer 1

• Opens:*
• *Relief Supply Dampers (D-001/D-037)**
• Relief Damper off closed seat → Main Supply Fans to Trip → D/P Damper (D-138) to Close*
• *Exhaust Filter Inlet Dampers (D-033/D-034)**
• *Exhaust Filter Outlet Dampers [Modulates] (D-146/D-147)**
• Shuts:*
• *Bypass Line Dampers (D-036/D-162)**
• Starts:*
• *ALL (3) Main Exhaust Fans**
• *ALL (3) Exhaust Booster Fans**

Question 2

• LOT 202.38 FHB HVAC*
• • *

Where does the FHB HVAC exhaust air to?

Answer 2

Plant Main Exhaust Stack

Monitored by RT-8035 / RT-8036

Question 3

• LOT 202.38 FHB HVAC*
• • *

What is pressure in the FHB normally maintained at?

Answer 3

Slightly Negative

Minimizes leakage of contaminated air from building to outside air.

Controlled by FHB HVAC DP Control Modulating Damper (FV-9501)

Question 4

• LOT 202.38 FHB HVAC*
• • *

What will cause a FHB HVAC Emergency Operating Actuation Signal?

Answer 4

SI

• *High Radiation (5x10^{-4 µCi}/_cc)**
• RT-8035 OR RT-8036*

High Radiation Signal will drop out after 100 sec (Regardless if High Rad clear) to allow reset on CP-022.

Question 5

• LOT 202.38 FHB HVAC*
• • *

How many fans are normally running at 100% power?

Answer 5

• *2 of 3 Supply Fans**
• *2 of 3 Exhaust Fans**

Exhaust fans are larger to maintain slightly negative pressure on FHB.

Question 6

• LOT 202.38 FHB HVAC*
• • *

What will happen to the FHB HVAC system during a LOOP?

Answer 6

• Open:*
• *Supply Fan Inlet Dampers (D-002/D-003/D-004)**
• Shut:*
• *Exhaust Filter Outlet Dampers (D-146/D-147)**
• Trip:*
• *Supply Fans**
• *Exhaust Booster Fans**
• Starts:*
• *All (3) Exhaust Fans**
• Locks in start signal to re-start fans when power returns*

Supply fans will not start on exhaust fan start b/c power will strip and not return.

Operator must open a relief damper (D-001/D-037)

Question 7

• LOT 202.38 FHB HVAC*
• • *

What will cause a ESF Fail to Actuate alarm on CP022 for the FHB Exhaust filter inlet and outlet dampers? (D-033/D-034 and D-146/D-147)

Answer 7

• Inlet (D-033/D-034):*
• *D-033/D-034 NOT Open**
• Outlet (D-146/D-147):*
• *D-146/D-147 NOT Open**
• *Air Flow High/Low [2/2]**

Question 8

• LOT 202.38 FHB HVAC*
• • *

What will auto start/stop a FHB HVAC Supply Fan?

Answer 8

• Auto Start:*
• *Associated exhaust fan start AND inlet damper FULLY open**
• Operator must manually open inlet damper*
• Auto Stop:*
• *Associated exhaust fan stops**

Question 9

• LOT 202.38 FHB HVAC*
• • *

How many FHB HVAC exhaust trains must be OPERABLE during movement of irradiated fuel?

Answer 9

• *One Train**
• *OR**
• *One Train Capable of being OPERABLE in 2 hrs**

TRM 3.9.12 FHB Exhaust Air System

Question 10

• LOT 202.38 FHB HVAC*
• • *

How are the charcoal beds in the FHB HVAC system protected from fire?

Answer 10

• *Manually activated deluge sprinkler system**
• Manually activated on CP022 (Fire alarm must be present)*

• Note:*
• Fusible link dampers provided for fire barrier isolation*

Question 11

• LOT 202.38 FHB HVAC*
• • *

What is the purpose of the FHB tornado damper?

Answer 11

• *Closes on low pressure outside the FHB**
• Prevents crushing ducting inside FHB during Tornado*

Located on South side of MAB

Question 12

• LOT 202.38 FHB HVAC*
• • *

What cools the components in the FHB HVAC System?

Answer 12

• MAB Chill Water:*
• *FHB HVAC Supply**
• *Temporary FHB Supplemental Cooling AHU**
• Only used to reduce heat during cask loading*
• Essential Chill Water:*
• *ECCS Pump Room**
• *Recirc Valve Room**
• *SF Pump Room**
• TSC Chill Water:*
• *PASS Station**