module 14: storage of radioactive waste documents... · demonstration of tint-test case in training...
Post on 25-Jul-2020
2 Views
Preview:
TRANSCRIPT
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 : nanthavan@tint.or.th
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.
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive
Waste, IAEA Headquarters in Vienna, 9 - 13 May 2011
7
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
11
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
Vienna November 2007: Overview of SAFRAN Tool 14
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
Vienna November 2007: Overview of SAFRAN Tool 15
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
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive
Waste, IAEA Headquarters in Vienna, 9 - 13 May 2011
18
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
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive
Waste, IAEA Headquarters in Vienna, 9 - 13 May 2011
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).
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive
Waste, IAEA Headquarters in Vienna, 9 - 13 May 2011
20
Outcomes from operator (1)
21
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.
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
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,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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.
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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.
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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,
IAEA Headquarters in Vienna, 9 - 13 May 2011
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.
.
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
27
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
28
Acknowledgement
Technical Meeting on Practical Application of Safety Assessment Methodologies for Predisposal Management of Radioactive Waste,
IAEA Headquarters in Vienna, 9 - 13 May 2011
top related