Misc

Question 1

What input does PPS give SESS?

Answer 1

initiation relays. If they fail, no alarms or lights

Question 2

If a SESS valve has been overriden and changed position, what lights will be on the SESS panel?

Answer 2

Blue - SEAS when the valve is moved from its actuated position

Question 3

If a manual SESS is input, what light is on?

Answer 3

white alarm, no blue

Question 4

Unit 1 is at 100% power with all systems in a normal lineup.
A large demand on the Demineralized Water system has dropped pressure at the pump discharge to 93 psig.
Based on these conditions, the standby DW pump is ___(1)___, and the system low pressure alarm is ___(2)___.
A. (1) running, (2) clear
B. (1) running, (2) in alarm
C. (1) not running, (2) clear
D. (1) not running, (2) in alarm

Answer 4

A

Question 5

Which of the following loads is supplied by the Domestic Water (DS) system?
A. Condensate Pump seals
B. Turbine Building AHU air washer makeup
C. Non-nuclear sample coolers
D. Stator Cooling water makeup

Answer 5

B

The rest are DW

Question 6

Which of the following loads is supplied by the Demineralized Water (DW) system?
A. Eyewash stations
B. Spray Pond makeup
C. Normal Chilled Water makeup
D. Instrument Air alternate cooling

Answer 6

C

The rest are DS

Question 7

What is the backup cooling source for the Instrument Air Compressors?

Answer 7

DS - Domestic Service Water

Question 8

If a unit loses DW water, can WRF supply water to the header?

Answer 8

Yes

Question 9

State the design basis for Station Black Out

Answer 9

• SBO only assumed on one unit. (LOOP and both DGs fail – loss of all AC)
• Required by 10CFR50.63 (cope with SBO, core cooling and CTMT integrity)

Question 10

What is the Station Black Out coping time?

Answer 10

• FSAR – 16 hour SBO coping time.
  o Assumes one SBOG is started within 1 hour.

Question 11

Can the Station Black Out Generators supply U2 and U3 at the same time?

Answer 11

• SBOGs operation coordinated through Unit 1
• SBOGs cannot supply U2/U3 simultaneously
• If a unit’s NBN-X03 XFMR is faulted, SBOG cannot supply that unit.

Question 12

On a Loss of Offsite Power (LOOP), how long do you have to start a SBOG?

Answer 12

• LOOP: energize NAN-S07 within 1 hour to maintain the SBOG batteries.

Question 13

In the SBOG, where is the air/fuel mixture ignited?

Answer 13

• Compressor has blades that turn like a fan to pull air into the gas turbine.
• Air is forced into the combustor, where fuel mixes with the compressed air.
• Air/fuel mixture is ignited in the combustor
• Burning gases rapidly expand out of combustor into the turbine. Gases transfer energy to the turbine blades.

Question 14

At what SBOG speed is the turbine “self-sustaining” ?

Answer 14

Acceleration
* 66% speed- energy of the hot gases from the combustor is enough to maintain turbine speed. “Self-Sustaining Speed.” Turbine starting system disengages. Pre/Post Lube Oil Pump stops. Atomizing air is now supplied from the compressor.
* 400°F (turbine 3rd stage) - ignition system switches off.
* 90% speed - Bleed Air Valve closes, Variable Vane Controller actuates open.

Question 15

What supplies cooling to the Fuel Building normal supply fans?

Answer 15

Normal Supply Fans (2)
* Two 50% capacity AHUs (19,000 cfm)
* Located on Aux Bldg roof
* Cool outside air from 113°F (max) to 80°F.
* Uses evaporative cooler. Pump auto starts > 80°F to supply Domestic Water (DS) to the cooler.

Question 16

Which fans have higher capacity, fuel building normal supply or exhaust?

Answer 16

Normal Exhaust Fans(2)
* Two 50% capacity fans (21,750 cfm)
* Located on Fuel Bldg roof
* Exhausts to atmosphere
*Larger capacity than supply fans
o Maintains negative pressure on Fuel Building

Question 17

What is the maximum release rate of the GR system? What air flow is required for H2 concerns?

Answer 17

The total release rate is limited to 50 standard cubic feet per minute or less. The release rate is
governed by the requirements of 10CFR.

The air flowrate through the vent is in excess of 25,000 SCFM to ensure the hydrogen
concentration is well below the combustion limit of hydrogen in air.

Question 18

Where are the Turbine building roof drains aligned?

Answer 18

The drains from the ‘Turbine building normal air handling units” also includes drainage from the
turbine building roof drains. During even modest rain storms, the Yard Area sump volume and
pumping capacity is insufficient to handle the influent, and the sump overflowed to the ground.
Due to a recent (2006/2007) modifications, piping has been installed to allow the Turbine Building
roof drains in the units to normally be routed directly to their respective CW intake canals, instead of to the OW System’s Yard Area Sumps.

Question 19

What are the GR compressor trips?

Answer 19

High-High O2 (only hi-hi)
interstage temp high
2nd stage discharge temp high
1st stage leak detection
2nd stage leak detection
interstage pressure high
discharge pressure high
lube oil pressure low
electrical protectoin

Question 20

What happens on a Hi O2 alarm on the GR panel? What happens on Hi-Hi O2?

Answer 20

High oxygen (2%) alarm conditions are indicated by an alarm on the GR control panel annunciator.
A high-high oxygen condition (3.75%) in the WGST or the surge header will result in the following:
* After a 5 minute time delay, nitrogen dilution valve AV-169 automatically opens to purge the tank and clear the alarm. Valve AV-169 will automatically close when the alarm clears.
* Trips and locks-out both waste gas compressors.
When the alarm clears, it will be necessary to reset the compressors manually by taking hand-switches HS-15 and HS-16 to “stop” simultaneously; return to “auto” position, as necessary, for continued operation.