Intro to TR15.306 and Task Based Risk Assessment to T… · •General guidance for task based risk...

Intro to TR15.306 and Task Based Risk Assessment

R. Todd DickeyEngineering Coordinator

Honda Engineering North America, Inc.

ANSI-Registered TR R15.306-2016

Task-based risk assessment– Updates the 2014 version of the

TR 306, which…• Updates the guidance given in

ANSI/RIA R15.06-1999, Clause 9

• Published in May 2016

– Key updates:• Table 2 – Risk level decision matrix

• Table 3 – Hierarchy of risk reduction measures

• Table 5 – Minimum functional safety performance

Representations of Risk

Risk can be conceptualized in a number of ways:

RISK

related

to the

considered

hazard

SEVERITY

OF HARM

that can result

from the

considered

hazard

is a

function

of

and

PROBABILITY OF

OCCURRENCE

of that harm

exposure to a

hazardous situation

the occurrence of a

hazardous event

the possibility to avoid

or limit the harm

Hazard

Risk

Exposure

Vulnerability

ISO/IEC Guide 51:2014(E)

Table 1

WHO Model used to describe natural

disasters

Risk Assessment (Part 2, 4.3)

• A systematic analysis of the tasks, hazards, and risksassociated with the robot system over its life cycle– Task (ISO 12100:2010, 3.25): specific activity performed by one or

more persons on, or in the vicinity of, the machine during its life cycle

– Hazard (ISO 12100:2010, 3.6): potential source of (physical injury or damage to health)

• ANSI/RIA R15.06-1999: Risk assessment was optional and a methodology was included in the standard

• ANSI/RIA R15.06-2012: Risk assessment is required but a methodology was not included in the standard

• RIA TR R15.306-2016: Risk assessment methodology that meets the requirements of R15.06-2012

Risk Assessment Process Flow

• Has been widely adopted for industrial automation since first appearence in ANSI/RIA R15.06-1999

• Any task-based risk assessment methodology is acceptable

ISO 12100:2010 Fig.1

Analysis of Initial Risk• New: 3x3x3 matrix• Initial risk is

assessed under the assumption no risk reduction measures have been implemented

• Requirements for risk reduction are a function of the severity, exposure and avoidance analysis

Risk Reduction and Safeguarding

• The hierarchy of risk reduction measures describes the preferred order for implementing risk reduction measures

Summary of Table 3 – Hierarchy of Risk Reduction Measures

Risk

Elimination

Substitution

Limit Interaction

Safeguards & SRP/CS

Complementary Protective

Measures

Warnings & Awareness

Means

Administrative Controls

Personal Protective

Equipment (PPE)

RIA TR R15.306-2016 Table 3

Risk Reduction and Safeguarding

The appropriate risk reduction measure is directly tied to the risk level

Functional Safety (SRP/CS)

Analysis of the hazard will establish the required performance level as described in ISO 13849-1

Summary• General guidance for task based risk assessment

process methodology can be found in ANSI B11.0 and ISO 12100

• TR R15.306 provides a methodology for industrial robot system applications

• Effective safeguarding utilizes several conjunctive risk reduction measures

• Risk reduction should adhere to the hierarchy for the most effective safeguarding

• Functional safety ensures that safety functions relying on a control system will be effective for the associated risk(s)

R. Todd Dickey

Engineering Coordinator

Honda Engineering North America, Inc.Marysville, Ohio USA

Telephone: +1 (937) 642-5000 Ext.61186

Todd_dickey@ega.honda.com

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