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EOP Procedures > Student Guide LOCAs > Flashcards

Student Guide LOCAs Flashcards

(61 cards)

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1
Q

When checking SG intact in E-1, what action should be taken if faulted SG pressure is lowering after action has been taken to isolate in E-2?

A

Faulted SG is considered isolated do not transition

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2
Q

Why check any SG pressure lowering or RCS pressure rising E-1 (Step 9)?

A

Determine if faulted SG is still blowing down. If a faultd SG is blowing down loop back until blowdown is complete and determine if SI can be terminated.

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3
Q

Why isolate accumulators with RCS pressure less than 150#?

A

Prevent N2 from entering RCS

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4
Q

Red path identified during ES 1.3. What does the crew do?

A

Continue ES 1.3. When complete then transfer to red FRP

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5
Q

In E-1 RCS Pressure is > than RHR pump shutoff head - should they be stopped?

A

No, they will be needed for injection when RCS Pressure lowers

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6
Q

In E-1 what conditions must be satisfied to stop CTS following LOCA?

A

CNMT Pressure <2#

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7
Q

SMBLOCA. When do we utilize hot leg recirc? Why is HL recirc normally not used for SMBLOCA?

A

Use HL recirc when subcooling is not restored. If subcooling is restored a high boric acid concentration will not be present.

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8
Q

Why must we stop SI pumps during HL recirc?

A

Dead head the pump. Mini flows were closed during transferring to HL path to prevent run out.

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9
Q

Where is the suction and discharge of each ECCS pump after transferring to HL recirc?

A

RHR sucking from recirc. SI and CCP sucking off RHR.

RHR and SI discharge HL. CCP to CL.

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10
Q

List RHR pump suction and discharge flowpath on CL recirc:

A

Suction: Recirc sump
Discharge: CL loop 1-4, CCP, SI

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11
Q

How long can RHR pumps be stopped for CL recirc alignment?

A

5 min - CCP and SI can maintain temp acceptable

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12
Q

When aligning for CL recirc only one of the SI recirc valves (IMO-262 / 263) can be closed. What should be done?

A

Nothing. They are in //. Only need one.

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13
Q

In ES 1.3, when can a red FRP be implemented?

A

when directed

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14
Q

What is the bases in ES 1.3 to split CCW trains?

A

Prevent runout in event one pump is lost

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15
Q

In ES 1.3 when is RHR spray established?

A

50 min after start of event w/ only 1 CTS pump running

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16
Q

Under what conditions would the SI pumps not be aligned for CL recirc?

A

RCS P > SI pump shutoff

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17
Q

What actions can be taken to minimize dose during transfer to CL recirc?

A

perform required local actions

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18
Q

What is the time and H2 limits for placing a recombiner in service?

A

6 hr - heat load in cnmt

0.5 < in service < 4%

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19
Q

List 4 phases of LBLOCA? (Heat Transfer mech)

A

Blowdown - onset of LOCA until RCS = CNMT (radiation)
Refill - until vessel refilled to bottom of core (radiation)
Reflood - until temp has lowered to long term recirc (radiation and stem convection)
Long Term recirc - pumps aligned for recirc (RCS to CCW)

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20
Q

Per accident analysis, when does ECCS reach:
Faulted loop
Intact

A

Faulted - never

Intact - during reflood

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21
Q

Does the accident analysis predict fuel damage or that the ECCS acceptance criteria are exceeded?

A

ECCS - Yes

Fuel damage - No

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22
Q

What is the basis for 5 min when going to cold leg recirc?

A

Ensure PC temp is not exceeded

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23
Q

Per EOPs SBLOCA vs LBLOCA?

A

SM if > than capacity of chargin

LB if RCS pressure is below RHR shutoff head

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24
Q

Why trip RCPs during LB?

A

Phase B protect RCPs

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25
List three phases of SBLOCA?
1) Blowdown - onset until ECCS = break 2) Reflood - temps have lowered to long term levels 3) Long term recirc - when aligned for recirc
26
SI termination and Basis
Subcooling - adequate core cooling Heat Sink - subcooling following SI term RCS pressure - subcooling will be maintained and SI flow is restoring inventory PRZ lvl - adequate inventory for core cooling
27
Why check RCS pressure after stopping CCP during SI term?
Ensures SBLOCA within capacity of one charging pump
28
Terminate SI and now PRZ lvl cannot be maintained.
Realign flow though BIT and go to ES1.2
29
During a SBLOCA what cause the core to be recovered after becomeng uncovered?
Loop seal clears
30
During LOCA what are the two methods of heat removal?
ECCS and Break Flow
31
What components provide cooling during a SBLOCA?
SI and CCP
32
During SBLOCA, when does reflux cooling begin?
Stm generation rate in the core exceeds capacity og SG to remove heat
33
What is reflux cooling?
Condensation of steam in HL of the SG tubes and returns as condensate via HL
34
What cooling indications may be misleading during reflux cooling?
Temp at periphery of core.
35
Impact if RCP ops continue during SBLOCA?
More mass loss by keeping two phase flow at break. Enhanced heat transfer to secondary.
36
Why trip RCPs if SBLOCA?
Prevent mass loss
37
Why trip RCPs at 1300#?
Before break becomes uncovered
38
Why CL break more severe?
Loop seal must be cleared before energy release
39
What is unique about a PRZ stm space leak?
Prz lvl rises
40
When is prz lvl no a valid indication of RCS inventory?
When subcooling does not exist. Voiding will cause PRZ lvl to rise
41
When does 1300# RCP trip criteria not apply?
- Following operator initiated cooldown - SI from non-power condition - RCP start as directed in EOP
42
How does ES1.2 achieve cold shutdown condition and ensure core protection?
By cooling down the RCS and reducing ECCS flow as subcooling allows
43
When do we transition from ES1.2 to E-1?
No RHR Injection
44
When do we transition from ES1.1 to ES1.2?
1) RCS pressure lowering following 1st CCP stop 2) PRZ lvl cannot be maintained with norm charging 3) RCS P < SI pump shutoff head
45
What conditions will allow stopping ECCS pump during flow reduction sequence in ES 1.2 when only PRZ lvl met>
HL < 340F and RHR pump running
46
What action in ES1.2 will be performed to enhance cooling if RCS is saturated?
RCS cooldown Cooling down could terminate net loss of inventory as RCS p lowers and ECCS flow rises
47
If RCS pressure drops to just above RHR shutoff head following LOCA can cooldown with ES1.2 be initiated?
No >100F / 60 min
48
Why check subcooling greater than 40F when initiating cooldown in ES1.2?
Determine if flow reduction can be performed. ECCS flow > Break Flow
49
What indicates RCS under adequate control?
subcooling and prz level
50
Describe subcooling trend when stopping an ECCS pump?
Subcooling will lower and then rise as cooldown continues. *Remember as RCS P lowers ECCS flow rises
51
While depressurizing to refill PRZ using PORV what adverse condition could occur?
voiding in vessel head
52
List procedures that transition to ECA 1.1?
E-1, ES1.3, ECA 1.2
53
ECA 1.1 Major Action
- Restore ECR - Raise / conserve RWST - C/D to cold shutdown - Depress to minimize subcooling 11% RWST - Add makeup to RCS from alt source - Depress SG to c/d and depress RCS - Maintain RCS heat removal
54
What is the major equipment we want to restore in ECA 1.1?
RHR pumps and or suction valves
55
What action is taken to minimize break flow?
depress
56
Basis of depress SG to 670#?
Controlled injection of accumulators
57
Why take NESW pump PTL?
Prevent EDG overload
58
What is the ECA 1.1 procedural loop with 11%?
IF RWST is <11% move faster and go to step 25
59
E-plan call if in ECA1.2
SAE
60
How do we determine if action taken in ECA1.2 was successful?
RCS P rising or stable
61
How many CTS pump should be running if cnmt p is 9#?
one

EOP Procedures (8 decks)

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