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Module 2 - Instrumentation > C5101 - SRMs > Flashcards

C5101 - SRMs Flashcards

1
Q

What are the Retract permissives for SRMs?

A

> 106 CPS
Both associated IRM’s range 3 or above
Mode switch in RUN
SRM bypassed

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2
Q

Can SRMs be retracted any time?

A

Yes, but may cause SCRAM or rod block

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3
Q

What causes INOP for SRM?

A

SOO/MU/HVL

Switch out of operate
Module unplugged
High voltage low <300 vdc

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4
Q

When is INOP bypassed for SRMs?

A

IRM range 8

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5
Q

What causes a SRM scram?

A

> 2x10^5 cps
INOP
single point causes a full scram

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6
Q

How are scrams bypassed?

A

Shorting links installed (normally installed)

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7
Q

When are SRMs bypassed?

A

Range 8 on IRM

Mode switch in Run

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8
Q

What’s the purpose of the pulse height discriminator?

A

Filters out electrical pulses that are not caused by neutron interactions in the SRM detector

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9
Q

When does SRM overlap with IRM?

A

2 of 40 IRM range 1
<1x10^5 cps (no rod block)
SRM fully inserted

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10
Q

What range can SRMs read?

A

1x10^-7 up to 30% CTP

10^-1 to 10^6 cps

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11
Q

What causes rod block for SRM? and when are they bypassed?

A

1x10^5 cps (bypassed in RUN or IRM range 8)

INOP (bypassed in RUN or IRM range 8)

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12
Q

What are SRMs made of?

A

Fission product chamber pressurized to 220 psig of Argon gas with 350 vdc applied between detector case and center electrode

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13
Q

What’s the power supply to the SRM drive motor?

A

480v 14B11

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14
Q

What’s the power supply to the control circuit?

A

14P11

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15
Q

When will the short reactor period come in?

A

< 50 second period

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16
Q

What will increasing voltage do to SRM?

A

Increases sensitivity

17
Q

what will too much voltage cause?

A

causes “breakdown voltage” making the SRM useless

18
Q

Where are the SRMs located when full in or full out?

A

15” above centerline of active fuel (Full in)

30” below bottom of active fuel (Full out)

19
Q

What is the purpose of SRMs?

A

Source Range Monitoring

Low power monitoring. used to monitor Neutron flux (Rx power) in start-up, refuel, and shutdown.
Can produce Rod blocks

20
Q

How many SRMs are there?

A

There are 6 SRMs: A-F

21
Q

How many SRMs are required in different modes?

A

Mode 2 4 required
Modes 3,4 2 required
Mode 5 Only one SRM channel required to be operable during spiral offload or reload when the fueled region includes only that SRM detector, special movable detectors may be used in place of SRMs if connected to normal SRM circuits

Module 2 - Instrumentation (12 decks)

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