RMCS

Question 1

Conditions which require emergency boration:

4 reasons

Answer 1

1. Failure of more than one RCCS to fully insert following reactor trip or shutdown.
2. Uncontrolled cooldown with the reactor shutdown.
3. Inadequate shutdown margin
4. Cb<2000ppm in the canal, cavity, or RCS or 1/M plot indicates approach to criticality after fuel movement ceased.

Question 2

Sources of Emergency boration per BOA pri-2

Answer 2

1. Boric acid transfer pump through 8104 and flow >30gpm.
2. Boric acid transfer pump with RMCS in manual -or- Borate with greater than 30 gpm flow. (7000 ppm)
3. RWST through CV112D and CV112E via CV pumps:
   
   • must maximize charging

Question 3

BA flow deviation alarm:

Answer 3

BA flow +- 1.0 gpm
Automatic actions:
1CV110B Closes if CS in auto
1CV111B closes

Question 4

PW flow deviation:

Answer 4

PW flow +- 8 gpm
Automatic actions:
In all modes EXCEPT BORATE and after a 30 second time delay. CV110B and CV111B close.

Question 5

0A starts on _____RCS and 0B starts on _____RCS

Answer 5

Unit 1 ; Unit 2

Question 6

Design basis of RMCS system:

Answer 6

1. Regulate boron concentration in the RCS to control slow reactivity changes.
2. Amount of boric acid stored is capable of borating the RCS to cold shutdown with the most reactive rod stuck out.
3. Rate of boration is sufficient to shutdown the reactor to 1% delta K/K with rods out in 93 minutes from full power.

Question 7

Capacity of one boric acid transfer pump basis:

Answer 7

One BA transfer pump sufficient to provide 1% Shutdown Margin (SDM) from 100% RTP, with All Rods Out (ARO) in 90 min. with 55 gpm boric acid flow. 30 gpm will RAISE SDM 1% in 74 min.

Question 8

CV111A supplies ____ to the blender. CV110A supplies ____ to the blender.
CV110B sends the blender to the _____of the VCT. CV111B sends the blender to the _____ of the VCT.

Answer 8

PW
Boric acid
Bottom
Top

Question 9

Immediate operator actions deviation alarms:

Answer 9

1. Determine cause
2. Evaluate reactivity change
3. If cause not determined:
   a. Verify auto actions
   b. Place makeup control switch to off
4. Set controller FK111A to <=80gpm if in dilute mode.

Question 10

In auto, the blended flow rate is _____gpm. In all other RMCS modes, the controller setpoint varies flow.

Answer 10

120

0-160 range

Question 11

Totalizers stop the _____ and _____ flow whenever the preset value is reached.

Answer 11

PW and boric acid

Question 12

With mode select switch in manual, the two valves ____ and ____ do not auto open. The logic assumes makeup is to the _____.

Answer 12

CV110B and CV111B; RWST

Question 13

There is a time limit on ________ of ______ hour(s). This minimizes _______depletion.

Answer 13

Alt. Dilute; 1; hydrogen

Question 14

The oxygen content in the VCT must not exceed _____% by volume when hydrogen also present.

Answer 14

2

Question 15

There are 2 _____ gallon boric acid tanks and 2 _____ gallon PW tanks.

Answer 15

48,000; 500,000

Question 16

F0111 looks at both ______ and F0110 looks at_____.

Answer 16

boric acid and water flow, throttles water flow;

boric acid flow rate only

Question 17

CV110a, b and CV 111 a, b fail ____ on loss of instrument air.

Answer 17

CV110A Fails open

CV110B, CV111A, CV111B all fail closed

Question 18

For borated water sources to be operable when operating,

temperature must be______, boric acid concentration must be ________, and tank level must be ______.

Answer 18

> =65F
=7000 ppm
=40%

Question 19

What indications does the operator have on the pm05J concerning RMCS?

Answer 19

Emerg boration flow
BA and total flow recorder
BA storage tank level
BA storage tank temperature
VCT level

Question 20

Borated water sources shutdown requires either of RWST or BAST. RWST temperature must be ____. BAST must be _____, ______, and ______. RWST must be____, _____, and ____.

Answer 20

> =35F
=65F, >=7000ppm, >=12%
2300-2500ppm, >=9%, 35F only applies when outside air <35F

Question 21

How to determine required flowrate of boric acid if given boron of the rcs:

Answer 21

120Brcs/Bbat

Question 22

Boric acid tank pumps are powered from a _____ power supply

Answer 22

non-esf, 133x/233x

Question 23

LCO 3.3.9 BPDS LCO

Answer 23

3.3 INSTRUMENTATION
3.3.9 Boron Dilution Protection System (BDPS)
LCO 3.3.9 BDPS shall be OPERABLE with:
a. One or more reactor coolant pump(s) in operation;
b. Each Reactor Coolant System (RCS) loop isolation valve
open; and
c. The BDPS instrumentation in Table 3.3.9-1 OPERABLE.
—————————-NOTE—————————-
The Boron Dilution Alert Alarm may be bypassed in MODE 3
during reactor startup.
————————————————————
APPLICABILITY: MODES 3, 4, and 5.

Question 24

Boric acid flow controller range is up to

Answer 24

40 gpm