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Systems by Topic > RHR > Flashcards

RHR Flashcards

1
Q

What is the design flow for LPCI mode of RHR?

A

10,300gpm per pump @20psid RPV pressure

17,000gpm per loop @20psid RPV pressure

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2
Q

What are the suction sources for RHR?

A

Suppression Pool

Shutdown Cooling (RPV)

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3
Q

What are the permissives to open the F020 Torus Suction valves?

A

Both F006s SDC suction in the same loop must be full closed

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4
Q

What permissives are required to open the F006 SDC suction valves?

A

The F020 Torus suction AND the F028 Torus Isolation must be full closed in the same loop

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5
Q

WHat are the power supplies for each RHR pump?

A

3412

1(2)A - E3

1(2)B - E4

1(2)C - E1

1(2)D - E2

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6
Q

Which RHR pumps have alternate ASSD power supply?

A

Div 2 pumps

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7
Q

What will trip an RHR pump?

A

Loss of suction - F004 AND F006 OR F008 OR F009 not full open will energize no suction trip relay

Anti Pump coil prevents re-shutting breaker until closing signal is removed

*this trip is still active when RHR is in local control from RSDP*

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8
Q

What RHR valves are powered by the opposite unit?

A

F028A/B - Torus Isolation

(RCR) F031&F032A/B RCR discharge and bypass

F015A/B - Inboard injection

F017A/B Outboard injection

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9
Q

What is the purpose of the RHRSW booster pumps?

A

Maintain service water (tubes) >15psi higher than RHR (shell)

This prevents reactor coolant from leaking into the atlantic ocean via service water

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10
Q

What are the heat exchanger flow limits for RHR flow?

A

1 RHR pump - 4150-10000gpm

2 RHR pump - 8300-11500gpm

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11
Q

What are the heat exchanger flow limits for RHRSW flow?

A

1 RHRSW pump - 2000gpm to 4000gpm

2 RHRSW pumps - 5000 to 8000gpm

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12
Q

What is the normal service water supply for each loop of RHRSW?

A

Div 1 (A&C) - CSW

Div 2 (B&D) - NSW

can be cross connected

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13
Q

What will cause the RHR room coolers to start?

A

North RHR: 98dF in either RHR room or 120dF in HPCI room

South RHR 98dF in either RHR room or 145dF in HPCI room

North cooler has a fail to start alarm after 15seconds.

South cooler has no fail to start alarm

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14
Q

What is the effect of an inop RHR room cooler with regards to Tech Specs?

A

1 INOP cooler = 1 INOP loop of RHR (pick one)

2 INOP cooler = LCO 3.0.3 - inop both loops of LPCI and HPCI

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15
Q

When will the F007 RHR min flow valve open?

A

Auto opens when breaker closes for associated pump and flow <2230gpm for 10 seconds

Valve must be manually closed if open when pump is secured

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16
Q

What initiates LPCI?

A

LOCA

LL3 (45”)

OR

Hi DW pressure (1.7#) AND Low RPV pressure (410psig)

17
Q

Describe LPCI initiation

A
  • RHR pumps start 10 seconds after energize (STR timer)
  • F048 heat exchanger bypass valve has open signal for 3 minutes from initiation signal
  • Suppression Pool cooling valves close (F024 and F028) if cooling permissive not met
  • Spray valves close (F016, F021, F027, F028) is spray permissive is not met
  • RHRSW pumps trip (if running)
  • 410psi RPV - Injection valves get an initiation signal
    • F015 inboard - cannot close with LPCI signal present
    • F017 outoard - open and cannot throttle for 5 minutes from 410psi permissive with initiation signal present
  • 310psi RPV - RCR discharge and bypass valves close
  • 200psi RPV - RHR pumps overcome shutoff head and injection starts
18
Q

What causes a Group 8 isolation?

A

LL1 (166”)

OR
RPV pressure >131psig

19
Q

What are the Group 8 valves and when do they close?

A

F008 and F009 close on either group 8 signal

F015 only closes on LL1 if either the F008 and F009 are not full closed

20
Q

What happens to the RHR system if a LOCA from level occurs during SDC?

A
  • Group 8 closes F008, F009 and F015
  • RHR pumps due to loss of suction source -must be reset due to anti pump
    • F004 and F020 do not automatically open because F006 does not automatically close
  • F015 will auto reopen at LL3 IF F008 or F009 asre full closed
21
Q

What happens to the RHR system if a LOCA from drywell pressure is recieved duing SDC?

A

RPV pressure already <410psig to permit using shutdown cooling

Heat sink is lost

F008 and F009 do NOT close (no Group 8)

RHRSW pumps trip

F048 opens and cannot b e throttled for 3 minutes

22
Q

What does the “lacka lacka” switch bypass?

A

Bypasses level above 2/3 core height and lack of a LPCI signal for Cooling and spray permisives

23
Q

What drywell pressure will logic permit using containment spray for?

A

>2.7psig

24
Q

What happens to spray and/or cooling valves if logic is lost for the spray/cooling permissive after the valves are already open?

A

the valves do NOT auto close unless there is a LPCI signal

25
Q

What temprature is suppression pool cooling designed to keep the suppression pool at following a LOCA?

A

<170dF

26
Q

What is flow limited to for RHR service water injection?

A

Orifice flow limits injection to 3200gpm to protect service water flow to the diesels

27
Q

What loop of RHR has service water injection available?

A

Div 2 (B&D)

28
Q

What temperature does fuel pool cooling assist keep the fuel pool at and what is the basis for this value?

A

Fuel pool must be below 125dF to prevent iodine release from water

29
Q

How is a LPCI start terminated and prevented?

A

Take the pump control switch to off with a LPCI signal present AND STR timer timed out (10 sec)

Pump switch to off without LPCI will NOT seal in

30
Q

How must a LPCI signal be reset?

A

FIRST reset core spray logic to de-energize STR timer (drops RHR pump override)

Within 10 seconds Reset LPCI logic to prevent RHR pumps from restarting

31
Q

What are the effects on the LPCI mode of RHR from a loss 1 division C logic power?

A

All RHR pumps still start

Valves must be manually aligned

Pumps from division without power can be turned off but cannot be restarted due to anti pump sealed in from opposite division

Systems by Topic (14 decks)

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