EOP Safety Functions

Question 1

LOCA -Safety Functions

RCS Inventory

Answer 1

Condition 1

a. Pressurizer level greater than 10% [15%].
b. RCS is 24°F [44°F] or more subcooled.
c. RVLMS indicates that RVUH level is 16% or more.

Condition 2

a. Safety Injection flow is adequate. REFER TO Appendix 2, Figures.
b. CET Subcooling indicates less than 44°F [60°F] superheat and NOT rising.
c. RCS Subcooling indicates less than 44°F [60°F] superheat and NOT rising.

Question 2

LOCA-Safety functions

RCS Pressure Control

Answer 2

ACCEPTANCE CRITERIA: 
Condition 1 
a. Pressurizer pressure within the P/T limits. REFER TO Appendix 2, Figures. 
Condition 2 
a. Safety Injection flow is adequate. 
REFER TO Appendix 2, Figures.

Question 3

LOCA- SAFETY FUNCTION

5. Core Heat Removal

Answer 3

a. CET Subcooling indicates less than 44°F [60°F] superheat and NOT rising.
b. RCS Subcooling indicates less than 44°F [60°F] superheat and NOT rising.

Question 4

LOCA- Safety Functions

6. RCS Heat Removal

Answer 4

a. At least one Steam Generator has level 45 - 60% [45 - 60%] NR.
OR
Feedwater is restoring at least one Steam Generator level to 45 - 60% [45 - 60%] NR.

b. Tc is stable or lowering.

Question 5

LOCA- Safety Functions

7. Containment Isolation

Answer 5

Condition 1

a. No valid steam plant activity radiation monitor alarms or unexplained rise in activity.
b. Containment pressure is less than 3 psig.
c. No valid containment area radiation monitor alarms or unexplained rise in activity.

Condition 2

a. No valid steam plant activity radiation monitor
b. CIAS actuated.

Question 6

LOCA- Safety Functions

8. Containment Temperature and Pressure Control

Answer 6

Note:Hydrogen criterion may be omitted until hydrogen monitor is in service
ACCEPTANCE CRITERIA:
Condition 1
a. Containment temperature is less than 235°F.
b. Containment pressure is less than 8.5 psig. c. Hydrogen concentration is less than 1.1%. Condition 2
a. At least one Containment Spray header flow is greater than 4350 gpm.
b. Containment pressure is less than 55 psig. c. Hydrogen concentration is less than 4.9%.

Question 7

LOCA- Safety Functions

2. Maintenance of Vital Auxiliaries

Answer 7

a. At least one vital 4.16 kV AC bus energized.
b. At least one of the following trains of PK and PN is energized and is on the same train as the energized vital 4.16 kV AC bus.
• PKA-M41, PKC-M43, and PNA-D25
• PKB-M42, PKD-M44, and PNB-D26
c. No jeopardized safety functions require restoration of electrical power to a vital AC or DC bus.

Question 8

LOCA- Safety Functions

1. Reactivity Control

Answer 8

a. Reactor power dropping.
OR
Reactor power less than 2 x 10 lowering. -4% and stable or lowering
b. ALL full strength CEAs are fully inserted. OR
Boration is in progress at greater than 40 gpm.
OR
Adequate shutdown margin as required by Tech Specs is established.

Question 9

RX TRIP- Safety Functions

1. Reactivity Control

Answer 9

a. Reactor power dropping
OR
Reactor power is less than 2 x 10-4% and stable or lowering.

b. ALL full strength CEAs are fully inserted. OR
Boration is in progress at greater than 40 gpm.
OR
Adequate shutdown margin as required by Tech Specs is established.

Question 10

RX Trip- Safety Functions

2. Maintenance of Vital Auxiliaries

Answer 10

a. At least one vital 4.16 kV AC bus energized.
b. At least one non-vital 13.8 kV AC bus energized.
c. At least one non-vital 4.16 kV AC bus energized.
d. At least one of the following trains of PK and PN is energized and is on the same train as the powered vital 4.16 kV AC bus:
• PKA-M41, PKC-M43, and PNA-D25
• PKB-M42, PKD-M44, and PNB-D26

Question 11

RX Trip- Safety Functions

3. RCS Inventory Control

Answer 11

a. Pressurizer level is 10 - 65%.
b. Pressurizer level is trending to 33 - 53%.
c. The RCS is 24°F or more subcooled.
d. RVLMS indicates 100% RVUH.

Question 12

Rx Trip- Safety Functions

4. RCS Pressure Control

Answer 12

a. Pressurizer pressure is 1837 - 2285 psia.

b. Pressurizer pressure is trending to 2225 - 2275 psia.

Question 13

Rx Trip- Safety Functions

5. Core Heat Removal

Answer 13

a. RCS ∆T is less than 10°F.

b. The RCS is 24°F or more subcooled.

Question 14

Rx Trip- Safety Functions

6. RCS Heat Removal

Answer 14

a. RCS Tc is 560 - 570°F.

b. At least one Steam Generator has level 45 - 60% NR and feedwater is available.
OR
Feedwater is restoring level in at least one Steam Generator to 45 - 60% NR.

Question 15

Rx Trip- Safety Functions

7. Containment Isolation

Answer 15

a. Containment pressure is less than 2.5 psig.
b. No valid containment area radiation monitor alarms or unexplained rise in activity.
c. No valid steam plant activity radiation monitor alarms or unexplained rise in activity.

Question 16

Rx Trip- Safety Functions

8. Containment Temperature and Pressure Control

Answer 16

a. Containment temperature is less than 117°F.

b. Containment pressure is less than 2.5 psig.

Question 17

EOP expectations

Placing controllers in manual

Answer 17

5. Do not place systems in manual unless mis-operation in automatic is apparent. Systems placed in manual must be checked frequently to ensure proper operation. This does not apply to systems which are normally placed in manual due to post-trip operating parameters or which are placed in Local-Automatic versus Remote-Automatic. For example, performing a cooldown with SBCS in Local-Automatic or manual is easier and smoother than performing a cooldown using ADVs.

Question 18

LOCA

Harsh containment criteria

Answer 18

170 F

Or

10E8 mrem/ hour

The preferred instrumentation for determining harsh containment conditions due to high radiation levels is RU-148 and RU-149 for containment radiation levels.

Question 19

LOCA

Into NC - potential RU monitors

Answer 19

2. RU-2 or RU-3 may be substituted for RU-6 when EW is cross-connected to NC.