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RHR Flashcards

1
Q

RH design basis:

Include one train, two trains, CC temperature

A

Both trains: reduces RCS temperature from 350F to 140F within 36 hours with 5000 GPM CC flow, and CC supply temperature of 105F.
First 3 hours of C/D, CC temperature allowed to increase to 120F.
One train: Reduces RCS temperature to <200F in 44 hours.
Operate for one year following LOCA (W/ single failure)

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2
Q

RHR pumps ratings/classification

A

Mechanical seals
3000 gpm rated/5000 gpm runout
Shutoff head 200 psid

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3
Q

RHR pump trips

A

Overcurrent, ground overcurrent and UV

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4
Q

Over pressure protection, 8701A/B and 8702A/B cannot open unless ______. hot leg suctions from ____ and ____ hot legs.

A

<337#

A; C

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5
Q

Over pressure protection for RHR system, 5 items

A 
<337# to open hot leg suctions
Two suction reliefs 450#
Two discharge reliefs 600#
Arm low temp
CV letdown line relief lift at 600#
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6
Q

RH minimum flow rate is_____ gpm. ____gpm is allowable for _____ hour per month.

A

500; 335; one

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7
Q

RH606 and 607 are the ______ valves and fail _____ on loss of instrument air.
RH618 and 619 are the _______ valves and fail _____ on loss of instrument air.

A

heat exchanger outlet valves and controls temperature; fails open
Heat exchanger bypass valves; fail closed

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8
Q

PT-____ and PT-____ feed the pressure interlock for the hot leg suction isolation valves. setpoint is _____.

A

403; 405; 337#

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9
Q

RHR pump seals are cooled by _____.

A

CC

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10
Q

RHR mini recirc auto opens when flow _____ and auto closes at ______.

A

<750 gpm

>1400 gpm

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11
Q

450 # suction relief valves relieve to the _____

A

HUT

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12
Q

450# suction reliefs are sized to relieve capacity of ______ at ______ and ______ at ______.

A

one cv pump, 350F

two cv pumps, 200F

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13
Q

RWST tech spec parameters

A

2300-2500 ppm
35-100F
>=89% level

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14
Q

Loss of either PT-403 or PT-405 will prevent _____ of a _____ on associated side.

A

opening; hot leg suction valve

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15
Q

Injection to recirc

first 6 steps

A

Verify sump isol open 2/4 46.7% RWST
Close RWST suctions 8812s
Close CV miniflows
Close SI miniflows
Close RHR crossties (8716A/B Isolates hot leg discharge path)
Open suction header cross tie valves (8807A/B, connnects CV and SI suction headers)

Open RH to CV and SI suction valves )SI8804A and B)

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16
Q

The _____ relief valves are sized to relieve maximum ______ in the RH system.

A

600# discharge header; RCS backleakage

17
Q

During Hot Leg Recirc, the RH Pumps take a suction from the ________ and discharge to the _________.

A

Containment Recirc Sumps

A & C Hot Legs
CV Pumps Suction
SI Pumps Suction

18
Q

During Cold Leg Injection, the RH Pumps take a suction from the ________ and discharge to the _________.

A

RWST

Cold legs

19
Q

During Cold Leg Recirculation, the RH Pumps take a suction from the ________ and discharge to the _________.

A

Containment Recirc Sumps

Cold Legs
CV Pumps Suction
SI Pumps Suction

20
Q

During Shutdown Cooling Operations, the RH Pumps take a suction from the ________ and discharge to the _________.

A

A and C hot legs

Cold legs

21
Q

During Reactor Cavity Fill, the RHR pumps take a suction from _____ and discharge to ______.

A

RWST

A and C hot legs

22
Q

To open the RWST suction valves, 8812a/b:

A

To open:
CV8804A (SI8804B) closed (piggy back valves)
Normal injection lineup
SI8811A(B) closed (containment sump suctions)
Prevents draining RWST to Containment Recirc Sump

23
Q

RH8701A/B RH8702A/B, to open

A 
To open:
SI8811A(B) closed (cont sump)
SI8812A(B) closed (RWST)
CV8804A (SI8804B) closed (piggy back)
RCS pressure <337# on PT403(B) (PT405(A))
RCS Temperature <350F
RH CB >min required for SDM
24
Q

RH8701B and RH8702A normally have power _____(available or removed)

25
PT-403 goes with the ____ and 405 goes with the ____ for the RCS hot leg suction valves.
Bs; As
26
SI 8811A/B are the containment sump isolation valves and will auto open______ with ______. To manually open, ____ and _____ and ______.
SI coincident with Low-2 RWST level (2/4 <=46.7%) SI8812A(B) closed Prevents draining RWST to Containment Recirc Sump RH8701A or B (RH8702A or B) closed Prevents draining RCS to Containment Recirc Sump CS001A(B) closed Prevents draining RWST to Containment Recirc Sump
27
SI8809A and B are normally _______ and _______. Both must be open in order for water to flow to _______.
Deenergized and open | all 4 cold legs
28
SI8840, the a and c hot leg isolation valve is______ and is normally used________.
Deenergized closed Opened for Hot Leg Recirc Prevents Boron precipitation in the core Terminates boiling in the core Opened for Reactor Cavity Fill
29
RH8735, rwst recirc valve
Manual valve-normally locked closed Prevents recirculating RH injection water to the RWST during ECCS injection Used for pumping out refueling cavity
30
A RH Hx to CV Pump Suction Isolation Valve CV8804A
Normally closed Opened during ECCS recirculation to provide suction source to CV and SI Pumps To Open: Either RH8701A or B closed Prevents over pressurizing CV Pump suction SI8811A open Ensures suction source SI8814 and SI8920 closed OR SI8813 closed Prevents recirculating radioactive water to RWST
31
B RH Hx to SI Pump Suction Isolation Valve SI8804B
Normally closed Opened during ECCS recirculation to provide suction source to SI and CV Pumps To Open: Either RH8702A or B closed SI8811B open SI8814 and SI8920 closed OR SI8813 closed
32
LCO 3.4.14 PIV leakage, pressure interlock requirements
Verify RHR System suction isolation valve interlock prevents the valves from being opened with a simulated or actual RCS pressure signal >= 360 psig. If not, then within 4 hours isolate the flowpath with one deenergized closed valve.
33
CS-009A is interlocked with _______ and CS-009B is interlocked with _______. This prevents a flowpath between ______ and _______ through the CS system.
RH8701A; RH8702B; Containment sump; RCS
34
During a system cooldown, when would RHR be placed in service?
<350F and <337 psig
35
RCS pressure to open RH8701A/B and 8702A/B is _____ and tech spec number is ______.
337 psig | 360 psig
36
The RWST lo-2 interlock is enabled by ______.
SI signal
37
The purpose of CV128 is to _________ and ________ and _______.
- Permit cleanup of RC when RH operating - Provides pressure control of RC when pzr is solid - Used for letdown of RC when pressure is too low
38
SI 8811A/B sump suction isolation valves auto open when _____.
SI and RWST lo-2

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