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Wolfgang Goldammer

SADRWMS Plenary

Vienna, 12 – 16 April 2010

Application of the SADRWMS Methodology

- DS284 and SAFRAN Tool -

Overview

Overview of Draft Safety Guide DS 284

Goals of the development of the SAFRAN Tool

Scope and basic structure of SAFRAN

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Scope of Safety Assessment for

Predisposal Waste Management Relevant facilities / activities:

Processing of radioactive waste

Clearance and Discharges

Storage facilities

Transport

Intervention situations (e.g. old storage facilities)

All types of wastes

low level to high level waste

disused sealed sources

NORM

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DS 284 - Overview

1. Introduction

2. Demonstrating the Safety of Predisposal

Management of Radioactive Waste

3. Safety Fundamentals and Requirements

4. Objectives and Developement of the Safety Case for

Predisposal

5. Safety Assessment

6. Specific Issues

7. Documenting and Using the Safety Case

8. Regulatory Review Process 5

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Purpose of Safety Case

Demonstrate that all planned activities can be carried

out in a safe manner

Provide guidance for the design, engineering and

planning of operations to ensure safety

Input to regulatory process, including evidence of

complicance and arguments for confidence building

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Safety Case (1)

Role and components of the safety case

Development of a safety case

Elements of the safety case

Management systems

Involvement of interested parties

Discussion of options

Passive safety

Defense in depth

Scientific and technical engineering principles

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Safety Case (2)

Elements of the safety case (cont.)

Understanding of the predisposal system

Independent peer review

Safety case completeness

Traceability and transparency

Multiple lines of reasoning

Plan for addressing significant unresolved issues

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Safety Assessment

Assessment Context (1) Assessment purpose

Assessment scope

Regulatory framework

Assessment endpoints

Receptors

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Safety Assessment

Assessment Context (2) Assessment philosophy and approaches

Graded approach

Use of different assessment approaches

Probabilistic and deterministic approaches

Conservative and realistic assessments

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Description of the Facility or

Activity and Waste Site conditions

Facilities and activities

Waste

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Development and Justification of

Scenarios Potential hazard identification

Hazard screening

Identification of scenarios

Scenarios for normal operation

Scenarios for anticipated operational occurrences

and design basis accidents

Scenarios for beyond design basis accidents

(including serious accidents)

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Models and Calculations

Formulation of models

Performing calculations and analyzing their results

Management of uncertainties

Sources of uncertainties

Uncertainty and sensitivity analysis

Treatment of model an data/parameter uncertainties

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Analysis of Assessment Results

Comparison against assessment criteria

Identification of safety measures

Engineering analysis

Independent verification of assessment results

Review and modification of the assessment models

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Specific Issues (1)

Evolution of the safety case

Concept and design development

Construction

Commissioning

Operations

Shutdown and decommissioning

Review of the safety assessment

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Specific Issues (2)

Graded approach

Defence in depth

Expected lifetime of the facility

Long term storage

Timeframe

Passive safety

Retrievability

Management systems

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Specific Issues (3)

Waste acceptance criteria and interdependencies

Options appraisal

Framework for the decision-making process

Methodology

Application to existing facilities or activities

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Documenting and Using

the Safety Case (1) Integrating safety case arguments

Documenting the safety case

Executive summary

Introduction and safety case context

Safety strategy

Safety assessment

Synthesis and conclusion

Follow-up programs and action

Public involvement

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Documenting and Using

the Safety Case (2) Uses of the safety Case

Licensing

Construction and commissioning

Derivation of limits and conditions

Operation

Monitoring

Management controls

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Regulatory Review

Objectives and attributes of the regulatory review

process

Managing the review process

The use of a graded approach by the regulatory body

Conducting the review and reporting review findings

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Annexes

Annex A: Examples of hazards and initiating events

Annex B: Topical Issues for safety assessment

review for radioactive waste predisposal facilities or

activities

Annex C: Template of regulatory review report

Annex D: SADRWMS

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SA Framework Tool: SAFRAN

April 2006 developed in framework of IAEA project:

SADRWMS – Safety Assessment Driving

Radioactive Management Solutions

April 2007 introduced in another ongoing IAEA

project:

DESA – Safety Assessment in Decommissioning

SAFRAN Objectives (1)

Assist and guide development of safety assessment

for decommissioning, pre-disposal WM (disposal …

?) using internationally agreed methodologies

(SADRWMS, DeSa, ASAM)

Administer all data required (facilities, actitivities,

waste, operations), their time dependency and

interdependency

Perform assessments (normal operation, accidents)

with support by built-in calculation tools

SAFRAN Objectives (2)

Ensure the consistency of data, scenarios,

assessments

Assist the use of SA results to establish OLC‘s, OP‘s,

assess site factors etc.

Assist the communication during the development of

SA and between operator and regulator

Main Functions of SAFRAN (1)

To define facilities for storing or processing

radioactive waste and facilities to be

decommissioned including their design features

To define waste streams including all relevant

radiological and non-radiological properties and their

changes through the waste management activities

To define relevant requirements from the regulatory

framework (criteria, endpoints, other requirements)

To perform safety assessments for all steps of pre-

disposal waste management and decommissioning

activities

Main Functions of SAFRAN (2)

To perform calculations for quantitative analysis

To report the decision path and documenting the

safety assessment justification

To trace changes in the safety assessment and of

review comments to facilitate the development and

review of safety assessments

To support the use of safety assessment results in

various areas (e.g. siting of facilities, definition of

requirements for safety functions, operational limits

and conditions, operational procedures)

Benefits of SAFRAN (1)

To assist in performing systematic and structured

safety assessments in compliance with Safety

Standards

To manage information and data in the same medium

To assist planning activities by performing different

assessments

To prepare a draft report of the safety case

To demonstrate compliance with regulatory criteria

Benefits of SAFRAN (2)

To offer a basis for the review process as part of the

safety case development process

To provide a common platform for regulators and

operators to perform safety assessments and

discuss results effectively

To provide a possibility to address decommissioning

and waste management safety issues in a coherent

way

SAFRAN Potential Users and Use

Potential users:

Managers of radioactive waste

facilities

National regulators in the nuclear

and environmental fields

Organisations planning to

undertake decommissioning

Government departments

responsible for emergency

response

International organizations

SA professionals and

consultancies

Enterprises developing waste

management solutions

Possible uses:

Conduct Waste Characterisation;

Visualise waste management

schemes

Guidance in conducting safety

assessments

Support in quantitative

assessments

Perform integrated studies

First Phase of SAFRAN Test Cases

Vinca Serbia (1st test): April 2006

Leningrad NPP (operational): 4-8 June 2007

Questionnaire WG: Harwell 2 - 6 July 2007

Slovenia (small amounts): 9 - 13 July 2007

DeSa Laboratory test case: September 2007

Croatia (NORM): 22 - 25 October 2007

Moscow (RADON): 5 - 9 November 2007

Belarus (legacy): 26 - 30 November 2007

Chile (sealed sources): 3 - 7 Dec 2007

Cuba (sealed source): 11-15 Feb 2008

Leningrad NPP (operational): May 2008

TINT Test Case (1)

The Chatuchak waste processing and waste storage

facilities in Bangkok have been chosen as a test

case for the SAFRAN software

Work on the test case was performed between

January and November 2009

Overall goal:

Using SAFRAN, perform a complete safety

assessment for the complete set of facilities and

activities at the TINT site

TINT Test Case (2)

Work steps:

Defining the assessment context for the safety

assessment

Providing a description of the site, facilities and of

all relevant activities the safety assessment needs

to address

Defining waste streams and provide data

(inventories, throughput rates, activity

concentration etc.) required for the quantitative

assessments

TINT Test Case (3)

Work steps (cont.):

Key elements of the regulatory framework were

entered into SAFRAN

In-depth analysis of the waste management

activities to identify the hazards which arise in

normal operation conditions or which could arise

as a result of anticipated operational occurrences

or accidents

A first screening of the hazards resulting in

excluding PIE’s in general if the respective hazard

was not relevant for the test case site

TINT Test Case (4)

Work steps (cont.):

Development of a complete set of scenarios

Screening of specific scenarios was performed

based on qualitative assessments of the likelihood

and possible impacts

Analysis of the remaining scenarios qualitatively

to identify those for which quantitative

assessments are needed

Performing calculations for the scenarios

identified as requiring quantification

TINT Test Case (5)

Work steps (cont.):

Analysis and evaluation of the results and

determination of the relevant hazards and

necessary countermeasures (changes in

operations or design; additional safety elements)

Assessment of the compliance with regulatory

requirements and good practice

Derivation and discussion of overall conclusions

within the safety assessment

Discussion of the usefulness of SAFRAN and of

potential improvements