module 14: storage of radioactive waste documents... · demonstration of tint-test case in training...

TINT-Test Case

Nanthavan Ya-anant

Radioactive Waste Management Center

Thailand Institute of Nuclear Technology (Public Organization)

Technical Meeting on Practical Application of Safety Assessment Methodologies for

Predisposal Management of Radioactive Waste, IAEA Headquarters in Vienna,

9 - 13 May 2011

E-mail : [email protected]

Background

Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,

IAEA Headquarters in Vienna, 9 - 13 May 2011

In June 2008, Thailand proposed to be a Test Case in

the 5th Plenary Meeting on SADRWMS Project in

Stupicke Toplice, Croatia.

The Chatuchak waste processing and waste storage

facilities have been chosen as a test case for the

SAFRAN software.

- TINT-RWM center consists of solid and liquid waste

treatment facilities and centralized storage facilities.

- TINT represents a good test case for applying the

SAFRAN Tool to a relatively small but quite complex

waste management facility.

SADRWMS Group

Summary of RWM in Thailand Radioactive Waste Management Center, TINT has been responsible

for radioactive waste management operation in Thailand. The RWM service covers on collection, transportation, segregation, treatment, conditioning, and storage. • Low level solid wastes are treated by incineration and compaction. • Low level aqueous wastes are treated by chemical flocculation-precipitation, and ion-exchange method. • Treated wastes are packed in 200 liter-drums for conditioning by cement.

• Disused sealed sources are conditioned by several technologies, such as cementation, encapsulation, and over-packages. • Processed wastes in drums and DSRS in packages are stored in the storage facilities in the RWMC, in Bangkok and Klong 5, Pathomthani province.

Disused SRS Processed Waste in 200 L Drums

Storage No.1 Storage No.2 Storage No.3

Storage Facilities

Work on the test case was performed between

January 2009 and March 2010 Mile Stones and Progress

1. Preparation of document

data, regarding to the methodology

2. Input data to SAFRANS software and

creation scenarios

3. Calculation to get the results for the

End Point.

4. Preparation of Safety Report

Note: The work within the test case

has taken place in total during

four meetings with a duration of

one week each.



5

Each meeting involved between one and

three experts sent by the IAEA, staff

from TINT as well as staff from the regulator OAP.

Overall Goals

Using SAFRAN tool, perform a complete safety

assessment for the complete set of facilities

and activities at the TINT - Chatuchak site

Improvement of the TINT Predisposal Radioactive Waste Management Facility itself,

for the safety aspects and upgrading the

predisposal facilities in Thailand

Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive

Waste, IAEA Headquarters in Vienna, 9 - 13 May 2011

6

Work steps (1) 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



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8

Facilities:

• Processing Facilities

• Storage Facilities

Regulatory Framework

• National regulations

Waste Streams

• Newly arising wastes

• Existing wastes

RWM Activities

characterization, segregation, incineration,

compaction, liquid treatment, discharge,

conditioning and storage

SAFRAN Tool

Input all data: description of the site, facilities and so on, defining waste streams and provide data (inventories, etc.)

Vienna November 2007: Overview of SAFRAN Tool

9

Characterization

Characterised waste

Solid & Liquid

Conditioning

Conditioning

Waste segregation

Disused SRS

Waste processing

Conditioned waste

Packaged waste

Treated waste

Re-Packaging

Packaged waste

TINT Wastes Stream Diagram

Processing facility

Storage Facility

To perform the safety assessment, data are required for the

radioactive waste to be processed and stored with respect

to its volume and form, the radionuclides of concern, the

levels of radioactivity, the presence of fissile materials, and

other physical, chemical and pathogenic properties.

Secondary waste streams that may arise from waste

processing are to be included.

Inventory of Radioactive Waste in Thailand as fiscal year 2009

Categories Radionuclides Average m3/year

Total accumulation in storage

Low Level Waste

Solid Waste

Aqueos waste

Organic waste

Spent resin

125I , 131I, 99Tc 137Cs

3H, 14C, 35S, 32P 137Cs, 125I , 131I, 99Tc

3H, 14C

Activation products Corrosion products Fission products

6

200 0.1

0.3

About 800 drums (200 L) Processed Waste in drum

0 (treated and discharge)

6.6 m3

4.5 m3

Disused SRS

Medicine, Research

Industry

(Including orphan

sources)

226Ra

60Co, 85Kr, 90Sr 109Cd, 137Cs 210Po, 63Ni 241Am , 241Am /Be

etc

100 pieces

per year

16 drum-conditioned 226Ra needles

1 lead-container of

conditioned 4 Ci 226Ra source

1 lead-container of

conditioned 400 Ci 60Co

About 1500 piece- unconditioned

DSRS total activity about 3000 Ci

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Facilities Items Capacity Type of Waste Operational year Operational

Age ( years)

Solid Waste Treatment Liquid Waste Treatment Liquid Storage Conditioning Storage

- Incinerator equipped with off gas cleaning system - Compactor - Accelerator for chemical-precipitation plant - Stainless steel Tanks In Drum Cement Mixer - Storage facility no.1 - Storage facility no.2

15 kg/hr

40 ton

5 m3

5 m3 x 2

200 Liter

65 m2 x 4.5 m

80 m2 x 4.5 m

Burnable waste Compactable waste Aqueous waste low salt content Organic liquid waste Treated Waste; - ashes, sludge Disused SRS Processed Waste

1987

1993

1965

1995

1993

1994 1997

24

18

46

16

18

17 14

TINT- Predisposal Facilities at, Chatuchak, Bangkok

Vienna November 2007: Overview of SAFRAN Tool 12 Incineration Building Off-gas System

Waste processing facilities in Area1

Vienna November 2007: Overview of SAFRAN Tool 13

DSRS Storage Facility at TINT-Chatuchak

In front of the DSRS storage facility

Location : DSRS Storage Facility is close to the Incineration Building


Underground Tanks for Reactor Effluent and Aqueous Waste

Temporary Storage of Organic Liquid Waste in plastic container(20L)

before Treatment by new Incineration system (under construction at new site)

Location: Near the working place of reactor maintenance and the DSRS storage


Filtration System

Retention Pool

Aqueous Waste Treatment System

Underground Tanks

Discharge

Filtering System

Waste Processing Facility in Area 2

16

)

Drum storage Facility at Storage2,Chatuchak

Location : It is close to the retention pool and the RWMC Office



Work steps (2): 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

Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste, IAEA

Headquarters in Vienna, 9 - 13 May 2011

17

Work steps (3): 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



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Work steps (4): 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



Results of test case: All relevant aspects of the facilities, activities,

normal operation conditions, possible accidents

could be adequately represented in SAFRAN

The structured and systematic representation of

complex activities and the associated risks largely

facilitates the process of conducting safety

assessment

Iterative processes of developing safety

assessments are supported.

A set of conclusions to improve safety have been

identified (and partially also been implemented).



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Outcomes from operator (1)

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The use of the SAFRAN Tool has allowed the TINT Facility to identify and capture

comprehensive details at each stage of Predisposal RWM Facilities and Activities.

Identifying required and most cost effective improvements in facility design and

operation . An important benefit from the systematic assessment process is to

provide a justification for not requiring some additional safety elements. So that

TINT can save the budget for unnecessary expenses.

The participating in the TINT Test Case project and the associated expert missions,

numerous safety improvements were identified and implemented, so that the TINT

Predisposal RWM facilities and operation safety has been improved.

Replace with non-smoking area Improvement of roof and containner

Outcomes from operator (2) Use of the SAFRAN Tool complies with the Predisposal RWM safety requirements

(IAEA), making it convenient for operators to adopt the IAEA safety requirements

The test case project improved the confidence of the RWM operators in the safety

of the facility and in their understanding of the comprehensive and systematic

picture of the safety assessment

The Safety Assessment report will provide a transparent and clear record of the

safety assessment information, which can be submitted to the regulatory authority

as well as to the public

Lessons learned from the TINT test case, including the improved knowledge of

Safety Case and Safety assessment, etc., will support the establishment of the

new RWM Facility at Ongkharak site

The progress of the TINT test case can assist the promotion on safety culture in

Thailand.


IAEA Headquarters in Vienna, 9 - 13 May 2011 22

Outcomes from regulator The demonstration of the TINT Test Case will improve the practical experience and

technical knowledge of the national regulatory body (OAP) in application of regulations,

safety standards, safety criteria, safety requirements, etc.

A program for regular inspections of the physical state of the waste forms as required by

the regulatory body should be developed

The Test Case will be very useful in assisting the regulator in the future licensing of the

new RWM facility at Ongkharak site

In terms of upgrading the licensing process for radioactive waste facilities and activities,

OAP will need to establish the criterion for licensing. One of main issues will be the safety

assessment which the licensee should prepare and submit to OAP.

The SAFRAN tool will be very useful for OAP in the near future.

23 Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,


Demonstration of TINT-Test Case in Training Course

IAEA-RTC on Safety Case for Predisposal Management and

Centralized Storage of RW 8-12 Nov. 2010, Bangkok.



Additional Outcomes (1)

Demonstration of TINT-Test Case in Regional Workshop

IAEA-ANSN Workshop on Safety Assessment for

Predisposal RWM Facilities, 23-27 Nov. 2009, Bangkok.



Additional Outcomes (2)

Conclusion (1) All relevant aspects of TINT waste management (facilities, activities, waste, normal

operation conditions, possible accidents) could be represented adequately within

SAFRAN.

Apart from some aspects of user-friendliness which were identified and fixed,

SAFRAN has proven to be suitable for addressing complex real-world situations.

It is expected that this also holds for even more complex facilities.

Working within the predefined SAFRAN structure provides a valuable guideline during

the preparation of the safety assessment. Being supported by the tool, the risk of

disregarding important aspects is greatly reduced.

Using SAFRAN, an iterative approach to safety assessment is supported. The risk that

such iterations lead to confusion, contradictions and neglecting important aspects is

substantially reduced.

Several of the conclusions reached during the test case also could have been gained

within a less systematic assessment process (e.g. solely by expert judgment based on

arguments of experience, good practice etc.)

26 Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,


Conclusion (2) An equally important benefit from the systematic assessment process

is to provide a justification for not requiring some additional safety

elements.

The Test Case will be very useful in assisting the both operator and

regulator in the future for the licensing process of the new RWM

facility at the new site (Ongkharak District, Nakhon-Nayok Province)

The demonstration of the TINT Facility Test Case will improve the

practical experience and technical knowledge of the national, regional,

and international regulator and operator in application of regulations,

safety standards, safety criteria, safety requirements, etc.

Additional training on the methodology and practical application would

be appreciated, as well as further promotion and support from the

IAEA and other sources.

.



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Thanks to IAEA and SADRWMS group for

choosing Thailand to be a Test Case.

Special Thanks to the experts in 4 Missions

Wolfgang, Rodolfo, Frederic and Monika.

And Thanks for your attention

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Acknowledgement



module 14: storage of radioactive waste documents... · demonstration of tint-test case in training...

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