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Kay Kasemir ORNL/SNS kasemirk@ornl.gov Kay Kasemir ORNL/SNS kasemirk@ornl.gov

Kay Kasemir ORNL/SNS kasemirk@ornl.gov - PowerPoint Presentation

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Uploaded On 2020-06-15

Kay Kasemir ORNL/SNS kasemirk@ornl.gov - PPT Presentation

Jan 2019 Alarm System Guidelines Alarm System Components Control System Alarm Server Configuration User Interface Levels Of Complexity Use the Alarm System Control Room operator Configure the Alarm System ID: 777332

guidance alarm system alarms alarm guidance alarms system high hihi hard operators good redundant related respond action time configuration

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Presentation Transcript

Slide1

Kay KasemirORNL/SNSkasemirk@ornl.govJan. 2019

Alarm System Guidelines

Slide2

Alarm System Components

Control System

Alarm Server, …

Configuration

User Interface

Slide3

Levels Of ComplexityUse the Alarm SystemControl Room operatorConfigure the Alarm SystemCertain operators, IOC engineersAlarm System SetupCSS maintainer for siteComing up with a good configurationEverybody

Easy

Hard

Slide4

Creating a good Alarm Configuration B. Hollifield, E. Habibi,"Alarm Management: Seven Effective Methods for Optimum Performance", ISA, 2007

Hard

Slide5

Alarm PhilosophyGoal: Help operators take correct actionsAlarms with guidance, related displaysManageable alarm rate (<150/day)Operators will respond to every alarm

(corollary to manageable rate)

Slide6

DOES IT REQUIRE IMMEDIATE OPERATOR ACTION?What action? Alarm guidance!Not “make elog entry”, “tell next shift”, …

Consequence of not reacting?

How much time to react?

What

s a valid alarm?

Slide7

How are alarms added?Alarm triggers: PVs on IOCsBut more than just setting HIGH, HIHI, HSV, HHSVHYST is good ideaDynamic limits, enable based on machine state,...Requires thought, communication, documentationAdded to alarm server with

Guidance: How to respond

Related screen: Reason for alarm (limits, …), link to screens mentioned in guidance

Link to rationalization info (wiki)

Slide8

Example: Elevated Temp/Press/Res.Err./…Immediate action required?Do something to prevent interlock tripImpact, Consequence?Beam off: Reset & OK, 5 minutes? Cryo cold box trip: Off for a day?Time to respond? 10 minutes to prevent interlock?

MINOR?

MAJOR?

Guidance:

“Open Valve 47 a bit, …”Related Displays: Screen that shows Temp, Valve, …

Slide9

Avoid Multiple Alarm LevelsAnalog PVs for Temp/Press/Res.Err./…:Easy to set LOLO, LOW, HIGH, HIHI

Consider:

Do they require

significantly different

operator actions?

Will there be a lot of time after the HIGH to react before a follow-up HIHI alarm?In most cases, HIGH & HIHI only double the alarm trafficSet only HSV to generate single, early alarmAdding HHSV alarm assuming that the first one is ignored only worsens the problem

Slide10

Bad Example: Old SNS ‘MEBT’ Alarms

Each amplifier trip:

≥ 3 ~identical

alarms, no guidance

Rethought w/ subsystem

engineer, IOC programmerand operators: 1 better alarm

Slide11

Alarms for Redundant Pumps

Slide12

Alarm Generation: Redundant Pumps the wrong wayControl SystemPump1 on/off statusPump2 on/off statusSimple Config setting: Pump Off => Alarm:It’s normal for the

backup

to be off

Both running is usually bad as wellExcept during tests or switchoverDuring maintenance, both can be off

Slide13

Redundant PumpsControl SystemPump1 on/off statusPump2 on/off statusNumber of running pumpsConfigurable number of desired pumpsAlarm System: Running == Desired?… with delay to handle tests, switchover

Same applies to devices that are only needed on-demand

1

Required Pumps:

Slide14

Review: How Many alarms in last week?

Top 10 in last 24 h?

Slide15

SummaryEasy to useCheck alarms in Table, Tree, PanelFix it: Read Guidance, use Display Links✔AcknowledgeConfigurationCan be changed onlineOperators can update guidance or add better display links

Alarm System Setup

Somewhat Involved, but only once

Coming up with a good configuration

Hard

Easy

Hard