Mode 6 Operations

Question 1

If we change HVAC conditions in either the FUEL or CTMT BLDG, what can occur?

Answer 1

Flooding

Question 2

What can happen when gate from Fuel Canal to Spent Fuel Pool is removed?

Answer 2

Radiation levels may rise (FBEVAS possible)

Can manually initiate to avoid

Question 3

What do we inject for RCS Chemical Cleanup?

Answer 3

Hydrogen Peroxide (CRUD off of resin)

Inject 150-180F. Always <200F

Question 4

What is major concern during RCS Chemical Cleanup?

Answer 4

Radiation Level Rise (peak in first 2 hours expected)

Outage GOP requires posting areas

Question 5

What is a CORE ALTERATION?

Answer 5

Movement or manipulation of any fuel, source or reactivity control component (excluding CEA’s in UGS) in RX Vessel with head removed and fuel in pot

Question 6

When are CORE ALTS considered suspended?

Answer 6

When components are in static condition

Question 7

What is “Cessation of Core Alts”?

Answer 7

Administratively suspended (moves have ceased) and communicated to CR

Question 8

What are pressure and temperature limits for CS Pump use on SDC?

Answer 8

250 PSIA

200F

Question 9

When a N2 bubble is on PZR, what is used for Level?

Answer 9

Temperature (not pressure)

Question 10

What is the Maximum deviation between PZR Level indicators?

Answer 10

Less than or equal to 3%

Question 11

Before opening a path from an RCS Cold Leg to CTMT what must be done?

Answer 11

A Hot Leg vent must be established

REASON: Vent must be above level of RCS so as to not drain when RCS is open

Question 12

Why don’t we depressurize the RCS with high gas concentrations?

Answer 12

Gasses come out of solution, inhibits natural circulation by gas binding the SG U-tubes

Question 13

Why is SDC flow reduced to 3780 GPM when in Modes 5 and 6?

Answer 13

To preclude Vortexing during mid-loop ops

If done, SP Temps vs Time post shutdown requirements must be met via the SAOD

Question 14

How do we COOL down the PZR?

Answer 14

1. Maintain RCS and PZR CD rates
2. Aux Spray may be continuous
3. DT < 200F between RCS and PZR for 1 hour, raise PZR level to 95% by reducing Letdown
4. Raise N2 pressure to 100 PSIA
5. Vent PZR space to GR
6. Repeat to SWEEP
7. > 30 minutes and PZR Temp <150F, close Aux Spray
8. Lower PZR level to 50% by raising Letdown
9. PZR Manway preps
10. Low PZR level to 15% and Pressure to 15 PSIA
11. Remove PZR Manway

Question 15

How do we VENT the PZR?

Answer 15

Actually draw CTMT air IN, vs OUT

Question 16

When do we apply Seal Injection to the RCP’s (M5)?

Answer 16

> 195F or 215 PSIA in RCS for RCP start preps

Question 17

How long can an RCP be run without Seal Injection (after it had been previously established)?

Answer 17

Indefinitely providing it has NC

Question 18

How do we get a Steam Bubble in the PZR?

Answer 18

1. Open Vents
2. Raise Level 90-95%
3. Start PZR Cooling fan
4. Energize Heaters
5. Adjust Letdown BP controller (Level 35-40%)
6. Operate Heaters 100-190 PSIA and Vent
7. PZR 35-40% level, start Normal and Standby Charging Pumps
8. Balance Flow
9. Maintain RCS Pressure 100-190 PSIA, 50-54% Level

Question 19

Is LIFTING and SETTING the RX Vessel Head considered a CORE ALTERATION?

Answer 19

NO