ML20206M797
| ML20206M797 | |
| Person / Time | |
|---|---|
| Issue date: | 04/22/1999 |
| From: | Serkiz A NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| To: | Jocelyn Craig NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES) |
| References | |
| NUDOCS 9905170055 | |
| Download: ML20206M797 (68) | |
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UNITED STAT 8S
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NUCLEAR REEULATORY COMMISSION 4
WASHINGTON, D.C. 20666-4001 l
4 April 22, 1999 MEMORANDUM TO: John W. Craig, Director Division of Engineering Technology, RES THROUGH:
Sher Bahadur, Branch Chief b Engineering Research Applications Branch Division of Engineering TechnologyJBERUMENT ROOM FROM:
Aleck W. Serkiz, Sr. Mechanical. gr Engineering Research Application Bkrbihg g)
Division of Engineering Technology, RES
SUBJECT:
MEETING
SUMMARY
l A public meeting was held on April 15,1999, to discuss RES research activities related to NPP containment protective coatings and progress to-date. An industry coatings PIRT panel,
composed of industry nominated panelists, presented preliminary PIRT findings which identified process and phenomena, and rankings for the first coating system (steel substrate, inorganic zinc primer, epoxy phenolic topcoat) selected by the panel since this system is representative of applied coatings in a large number of PWRs. The PIRT process will be used to provide guidance to the SRTC program for selection of coating systems, materials properties and phenomena to be investigated. It should be clearly recognized that the PIRT findings presented j
at this meeting were preliminary and have been labeled accordingly. A second coatings PlRT panel meeting has been scheduled for mid-May 1999, with the goal of issuing the first coatings PIRT report by mid June 1999.
Establishment of this PIRT panel was acknowledged by attendees as being responsive to prior industry recommendations and this activity will be continued since it provides a link to industry expertisc, knowledge and timely exchange of information developed. On the other hand, it should be recognized that the PIRT panel's recommendations to the SRTC program will need to be reviewed against fiscal resources available, schedules that must be met and the reality of measuring or acquiring data to address phenomena and effects identified.
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SRTC staff reviewed progress to-date and discussed how project plans aligned with the PiRT findings. There was considerable discussion related to project plans, envisioned findings and how results would be applied for identification of " failed coating debris" characteristics and quantities (or " percent failed") for use in GSI-191, " PWR Sump Blockage." These discussions again illustrated industry's skepticism that a coatings failure model could be developed and l
whether quantification of the extent of " qualified coatings" failures could be achieved. This fatter aspect is in large part the result of individual views expressed at this meeting that j
observed " qualified" coatings failures were the result of misapplication of " qualified materials" g4' at local repair sites. This subject needs to be pursued further.
9905170055 990422 PDR ORG NREB PDR 001 ci R E* '# S i
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Attendees were requested to submit written comments, questions and feedback by mid-May 1999, so that the PIRT panel and SRTC project schedules could be maintained. NEl accepted responsibility for assembling and providing such feedback to NRC/RES/DET by mid-May 1999.
This meeting was the second interactive public meeting related to failure of containment protective coatings. The November 5,1998 meeting resulted in formation of a coatings PIRT panel. The staff will continue to review comments received and incorporate, as judged
, appropriate, into research plans. The first coatings PlRT report encompassing 2 to 4 potential coatings systems is targeted for mid-June 1999. The reporting of those results will occur at the ASTM D 33 Committee's meeting scheduled for June 28-29,1999, in Augusta, Georgia. A public meeting to report on STRC's coating systems research results was identified as occurring in late - October, or early November 1999. The plan is to continue these type of public meetings to facilitate timely exchange of findings and to benefit from industry knowledge, experience and feedback.
A listing of attendees and visuals used at this meeting are provided as attachments.
cc:
NRC Public Document Room (with all attachments)
M. Marshall Jr., RES R. Elliott, NRR/DSSA/PSB R. Lobel, NRR/DSSA/PSB J. Davis, NRR/DE/M&CEB C.L. Lauron, NRR/DE/M&CEB J. Cavallo, CCC&L, Inc.
K. Cozins, NEl N. lyer, SRTC
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PUBLIC MEETING AGENDA
April 15,1999 US NUCLEAR REGULATORY COMMISSION OFFICE OF REGULATORY RESEARCH Rockville, Maryland PURPOSE: Discuss NPP Containment Protective Coatings Related Activities 9:00 AM Activities Overview A.W. Serkiz NRC/RES 9:10 AM SRTC Program Overview N.lyer W-SRTC 9:20 AM PIRT Panel Overview J. Cavallo CCC&L Inc.
9:30 AM PIRT Ranking Process B. Boyack LANL 10:00 AM Break 10:15 AM industry Coating PIRT J. Cavallo CCC&L, Inc.
12:30 PM Lunch Break 1:30 PM NPP Coatings Failure P.Zapp W-SRTC Mechanisms Analysis 2:30 PM Failure Modeling &
R. Sindelar W-SRTC Experimental Verification 3:30 PM Break 3:45 PM Q & A Discussions 4:30 PM Closing Remarks Cavallo,lyer & Serkiz 4:45 PM Adjourn l
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.m PIRT OVERVIEW ISy firent E. Boya4 Public Meeting PWR Sump Blockage and NPP Containment Coatings Research Rockiille, Maryland April 1415,1999
[Los AI mob a
I CONTENTS
- The Acronym
- A Brief PIRTilistory
- The PIRT Process
- The PIRT Panel References
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PIRT ACRONYM Phenomena identification and Ranking Table The Acronym is a good description of a PIRT effort =>
J First we identify all pertinent processes and phenomena j
related to the " system" of interest and then we rank them 1
relative to one or more figures of merit
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. First PIRT [vepared in 1988-89 as [urt of Code Scaling Applicability and Urrertainty (CS AU) effort (Reference Slide - 3rd Bullet)
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- Westinghouw 4-loop PWR (spwific plant)
- Large break loss of coolant a ;ident or LOC A (Specific Scenarm))
- "Pnmary Evaluation Cnteria' was peak cladding tempersure or PCT Other Plant PIRTs folloueil
- Seseral Pn>duccon Reacic rs
- AP600 and SHWR BWR drywell &bris trans[urt (Reference Slide - 2nd Bullet)
PlRT process has evolved to point that some gercralized guidance has been prepared (Reference Slide - 1st Bullet)
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lLos Alamos F--
Element i Define Problem Theory Current P!RT EITor;t Specify the issue that is PWR Coating Sourns PIRT a
a driving the need, e.g.,
PWR Debris Sources PIRT licensing, operational, or..
PWR DebrisTransport PIRT Determine and define the problem Address specified physical behavior Revisit (recycle) as necessary
+
Match level with available time and financial resources
- Los Alamob 6
6 8
s.,
F r,
_.h Element 2 Define PIRT Objectives T.hDLY.1 Objectives related to intended use
- Support code development
- Resolution of heensing issue Guidance for
- Selection and definition of testing programs
- Guiding code-develipment decisims
- Guiding co& uncertainty quantification fos Alamosp--
7 Element 3 Define Potential Plant Designs Theorv Processes and phenomena are facility dependent Examples
- Some containmentcoating systems on concrete substrate
- Others on steel substrate
- BWR drywells and PWR containments are markedly difference andthese ditTerences determine the importance of the processes and phenomena that occur with respect to debris transport los AlamosH 4
l l
i e
,=1 e
a
,e C
Element 4 Define Potential Scenarios Theorv
+ L)ifferent phenomena occur during ditTerent events
- The relative importance of phenomena is scenario dependent Different equipment are active during different scenarias 5s AlamosH 9
Element 5 Define Parameter (s) of Interest Theory j
Establidi the Primary Evaluation Criteria Used to JUDGE the relative importance of phenomena
. Often based upon or derived from regulatory requirements
- Peak Clad Temperature /LBL(K A
]
- Vessel Inventory /SBLOCA
- Transport Fraccon/LBOCA Importance rank is a measure of its relative influena on the
- Primary Evaluation Criteria
%s AlarnosH 10 4
h 5
g.,
..m.
~~i J'
- p..
Element 6 Obtain Experimental and Amdytical Data Theorv 1
Datahaw should capture the knowledge of the state-of-the.
art Datahar should cover all aspects applicable to the problem ofinterest
- Individually Reviewed panel members Collectisdy Hesiewal(in j
some nunner) hy panel I
l
[Los Al;unosb II Element 7 Define High-Level Basis System Processes Theorv
+ OptionalStep Appropriate in complex, multi-component systems lleips to organize and focus a
the subsequent identification of the components and phenomena that should be further considered.
Can helpin the ranking stage,i.e,if the system isn't important during a phase, don't ranklower levels lLos AlamosH I2 4
8 l
.*I 6
e
.4, Element 8 Partition Scenario Into Convenient Tinie Phases Theorv Importance of phenomena
+
often time dependent i
Partition scenario into
+
consenient phases Example, LillDCA
- Blowdown
- Refill
- Reflood
'Los Alamos F--
a Element 9 Partition Design into Components-Theory Example
+ Scenario occur at different The PIRT panel decided to i
levels decompose a steel substrate,
- system lesel(inter componenn inorganic zine primer, and
- component levet (tocan epoxy phenolic topcoat system Partitioninginto components into the following component 3 and subsystems aids organiz-
+ Substrate ing and ranking efforts
. Substrate primer interface j
Definitions of systems and
. Primer
+
components are specific to
- Primer-top coat interface the problem under
- Top coat 1
consideration
- Los AlamosF--
14 j
j a
g e
4 Element 10 Identify Plausible Phenomena Theory Order
+
- System imponant, e g., actn e
- Co uponent important, e r, active
- Process / Phenomena Completenes is a primary objective Recommended Approxh
+
- Colleenve experow
- Identify plausible phernimena
- No importance discussuns
- Brainstorming (speak it=>recordi fGs Alamos}--
45 Element 11 13 Rank Phenomena for Importance Note Theory All ranking approaches Several approaches j
eventually rely on informed
- Formal, e g., Analyucal literarchy judgements by the " experts" on Decision making tool the given PIRT panel J
. Individual results tabulated
. Pair wide cialuations
- Group Discussion Ranking Seales
- Point, e g..,0- 10
- Definitions -
i
. Low - smallinduence on primary evaluation critena
. Medium moderate innuerre
. High controlling innuence iLos Alamosp in I
e.
8 A'
a
.o
.e
.4.
Element 14 Perform Selected Confirmation Studies Theorv
+ Optionalstep PIRT development an
+
iterative process New information may arise during the PIRT preparation Cost-effective studies may be identified that would add significant insights
[Los Alamos F---
17 Element 15 Finalize and Document the PIRT Theorv PIRT tables AND
+
+ Supplemental documentation
- Plant desenption
- Scenario description
- Ranking scales
- Phenomena /praess definitions
- Esaluauon enteria
- Technical rationate for each phenomena ranked l
j Los Alamos F-18 4
g i
e.,
m
.a..
?
I PIRT Panel Consists of 5-8" experts" Collectively, the panel should have expertise that covers the spectrum of expected processes and phenomena Some on the panel should also have expertise with respect
+
to the plant and scenario Experience with the PIRT process is helpful; at least one a
member of the panel must have significant PIRT experience The PIRT process, if followed, permits the panel members to collectively identify and rank the processes and phenomena associated with the given problem; the process enforces a discipline and a stmeture on die effort.
[Los AlamosF--
19 REFERENCES G. E. Wilson and B. E. Boyack "The Role of'tte PIRT Process in Experiments, Co& Development andCode Applications Associated with Reactor Safety, Analysis," Nuclear Fagineering and Design, V.
I86, pp. 23-38 (1998).
G. E. Wilson, B. E. Boyack, M.T. Leonard, K. A. Williams,and L T. Wolf, " FIN AL REPORT-BWR lYywell Debris Transport Phenomena Identification and Rankmg Table," Idatn National Environmental and Engireering Laturatory document INEEI1 EXT-97-00894 (September 1997).
G. E. Wilson, et al.," Quantifying Reactor Safety Margins Part 2: Characterization of important Contributors to Uncenainty,"
Nuclear Engineering and Design, V. I19, pp.17-31 (1990).
{Los Alamosh--
N r
Q e
n
..x PRELIMINARY DRAFT PIRT PROCESS for SRTC Containment Coatings Research Program Activity Overview and Status Jon Cavallo industry Coating PIRT Panel Chairman April 15,1999 4/1299
!NDUSf4Y,mRT.DRES_4 Pot 1
Industry Coating PIRT Activity PRESENTATION OVERVIEW
Background
Introduction to the PIRT Process PIRT Panel Members Objectives of PIRT for SRTC Research Program Definitions PIRT Steps Additional Activities Summary 4/12/99 INOUSTRY ART PRES _4 ppt 2
~
1 8
F
PRELIMINARY DRAVT-Industry Coating PIRT Activity BACKGROUND SRTC Research Program Objectives
- Investigate NPP containmer ' coating failure mechanisms, failed coating debris characteristica, and time to failure.
Identify failed coatings debris characteristics and time to failure for use in debris transport studies simulating post-LOCA conditions Industry Coating PIRT Panet Evolution
- SRTC Research Program initiated - July,1998
- SRTC Research Program initial results presented - November,1998
- NEl recommends performing PIRT to guide program l
- PIRT panel formed and met:
March 2-3,1999 Apnl 8-10,1999 U 2/99 iNOUSTRYfRT, PRES 4 PET 3
Industry Coating PIRT Activity What is a PIRT?
Phenomena identification and Ranking Table The acronym describes the effort: first, identify pertinent process and phenomena related to the performance of the coating system of interest, then rank them relative to one or more figures of merit.
4/12/99 INOUSTRYf RT_ PRES _4 PDT 4
i i
2 5
t
,,A 9
m
PRELIMINARY DRAFT I
Industry Coating PIRT Activity Description of the PIRT Process C;$9 iNOUSTRVf RT, PRES,4 PDT Industry Coating PIRT Activity PIRT Panel Members 1
Jon Cavallo, CCC&L, Chairman Tim Andreychek, Westinghouse Owners Group Jan Bostelman, ITS Corportation Brent Boyack, Los Alamos National Lab Garth Dolderer, Florida Power and Light Company David Long, Keeler and Long, Inc. (Retired)
NRC Sponsor Al Serkiz, NRC/RES, Project Manager d 2/99 INDUSTRY,AIRT_ PRES,4 pot 6
i b
e I
m PRELIMINARY DRA Industry Coating PIRT Activity Industry Coatings PIRT Objectives Identify coating systems considered for PIRT process
- Based on industry usage
- Steelsubstrate
- Concrete substrate Identify phenomena and processes for coatings applied inside NPP containments Rank those phenomena and processes with respect to their importance to coatings failures 4/ C99 INDUSTRY, ART, PRES.4 PPT 7
Industry Coating PIRT Activity POTENTIAL PIRT APPLICATIONS
- 1. Provide input to SRTC program for selection of materials and parameters to be investigated.
- 2. Provide' input to SRTC program on phenomena to be simulated in experimental phase of test program.
- 3. Provide input to SRTC on data to be obtained from the experimental program.
- 4. Provide input to SRTC coatings failure model for features to be included in the program.
- 5. Provide input to industry groups for their use.
I
- 6. Provide input to NRC for regulatory considerations.
4/12/99 INDUSTRY PIRT_ PRES.4 PPT 4
4
..c PRELIMINARY DRAFT Industry Coating PlRT Activity DEFINITIONS Failure:
- Disbonding of an applied coating (paint) system into free debris, regardless of size and shape, that is available for transport; a debris source term.
Source terms:
- Coating systems that have failed prior to the event.
- Coating systems that fail as a consequence of the event.
9 4.12./99 INDUSTRYf'RTf4ES.4 ppt 9
)
Industry Coating PIRT Activity STEP 1:
DEFINE THE ISSUE (S)
- 1. Why and how do coating systems fail?
- 2. What are the effects of environmental exposure on coating systems?
- 3. What is the time to failure for coating systems?
4/12/99 INOUSTRYfiRT PRES.4 PPT
- O 5
I h
a e
a..
PRELIMINARY DRAFT Industry Coating PIRT Activity STEP 2:
DEFINE PIRT OBJECTIVE Identify and rank the phenomena and processes important to the potential failure of coating systems used inside containment at Nuclear
]
Power Plants.
\\
4/12.99
'NOUSTRv PtRffRES.4 Ppf 11 Industry Coating PIRT Activity STEP 3:
IDENTIFY COATING SYSTEMS Eight systems considered.
- 1. Steel Substrate, Inorganic Zine Primer, Epoxy Phenolic Topcoat
- 2. Steel substrate, epoxy phenolic primer, epoxy phenolic topcoat
- 3. Steel substrate, inorganic zinc primer, epoxy topcoat
- 4. Steel substrate, epoxy primer, epoxy topcoat
- 5. Concrete substrate, surfacer, epoxy phenolic topcoat
- 6. Concrete substrate, surfacer, epoxy topcoat
- 7. Concrete substrate, epoxy phenolic primer, epoxy phenohc topcoat
- 8. Concrete substrate, epoxy primer, epoxy topcoat System 1, above. -selected for initial PIRT W12,90 INDUSTRvf RTfRE S.4 PPT i2 6
4
PRELIMINARY DRAFT Industry Coating PlRT Activity STEP 4:
DEFINE POTENTIAL COATING FAILURE SCENARIOS 1.
Normal plant operation 2.
Mechanical damage 3.
Chemical damage (spills, chemical decontamination) 4.
Normal operation followed by intermediate / large LOCA without jet impingement 5.
Jet impingement due to LOCA: excluded from PIRT Note: These scenarios may occur independently or synergistically to cause failure 4/12/99
'NOUSTRYf RT_ PRES.4 PPT 13 Industry Coating PIRT Activity STEP 5:
DEFINE PARAMETERS OF INTEREST Will the coating system detach from the surface to which it is applied.
Will the paint fall off?
An2/99 INDUSTRYfRf PRES.4 PPT 14 7
PRELIMINARY DRAFT Industry Coating PlRT Activity STEP 6:
IDENTIFIED EXPERIMENTAL AND ANALYTICAL DATA
- 4. Coatings research data; SRTC.
- 5. Industry data; walkdown data, industry sponsored EQ data.
- 6. Regulatory data; GL 98-04.
4/12/99 INDU$f R V_PRT, PRES _4 PPT 15 Industry Coating PIRT Activity STEP 7:
DEFINE HIGH-LEVEL BASIS SYSTEM PROCESS This step was assessed as not being applicable to the development of the coating systems failure PIRT and was therefore not performed.
4/12/99 1NOUSTRY ART _ PRE $_4 PDT
'6 8
c PRELIMINARY DRAFT Industry Coating PIRT Activity STEP 8:
PARTITION SCENARIO INTO CONVENIENT TIME PHASES Phase 1:
Normal Operation followed by LOCA, no jet impingement.
(-) tme Coabng system installaton:
- Surface Preparation
- Coatng Applicaton
- Cunng ILRT t = 0.0 Start of Power Operations.
t = 40 yr.
LOCA occurs (60 years -plant life extension) 4<1299 INDUSTRY A'RffRE$_4 PPT
O to 40 s:
Containment pressure and temperature peak and Phase 2 begin to decrease, blowdown of RCS complete at 40 i
sec, jet from break ends.
40 s to 30 m:
Safety injection and containment spray initiated from Phase 3 RWST, containment fan coolers operating, pool builduo dynamics, condensation on surfaces, boric acid washdown from containment spray, increase in ionizing radiation, turbulence associated with pool buildup.
3G m:
Full containment water level reached, swrtchover from RWST injection to sump recirculation, containment spray and core coolant drawn from sump, containment fan coolers continue to operate.
4/1299 INOUSTRY P'RTfRES.4 PPT to I
l 9
I 8
I 5
i
T c
PRELIMINARY dRAN' Industry Coating PIRT Activity 30 m to 2 hr.:
Initiate and maintain recirculation of core flow and Phase 4 containment spray from sump, flow fields to sump established, containment fan coolers continue to operate, washdown of surfaces due to containment spray, decrease in temperature and pressure, chemical exposure to submerged coatings in pool.
> 2 hr.:
Containment spray terminated, recirculation to core Phase 5 continues to licensing basis (100 hours0.00116 days <br />0.0278 hours <br />1.653439e-4 weeks <br />3.805e-5 months <br /> to 6 months), flow fields to sump decrease due to termination of containment spray, containment fan coolers continue to operate 4, t 2/99 iNOUSTRY. ART. PRES 4 POT 19 Industry Coating PIRT Activity STEP 9:
PARTITION COATING SYSTEM INTO COMPONENTS
- 1. Substrate
- Steel
]
- 2. Substrate / Primer Interface
- 3. Primer
- Inorganic Zinc
- 4. Primer / Topcoat interface
- 5. Topcoat
- Epoxy Phenolic
. Topcoat is exposed to containment environment I
. This process will be repeated for several other coatings systems identified in Step 3 that will undergo the PIRT process.
4/12/99 tHOUSTRY, ART _ PRES _4 PPT 20 10 0
4 0
e
PRELIMINARY DRAFT Industry Coating PIRT Activity STEP 10: IDENTIFY cLAUSIBLE PHENOMENA Phase 1:
Normal operations Pressure cycles:
1 atmosphere to approximately 60 psig (ILRT) at time = 0 and approximately once every 10 years thereafter.
+ Thermal cycles:
(associated with refue'ing)- 120
- F during normal operation to outside ambient every 18 months, duration approximately 30-45 days Humidity cycles:
(associated with refueling - 20 percent RH during normal operation to outside ambient (up to 100 percent RH) every 18 months, duration approximately 20-45 days Chemical cycles: soluble salts (e.g. chlorides), boric acid,
+
decontamination solutions, grease, oil, solvents Radiation:
varies with location in containment
+
4/12/99 NDUSTRY p f PRES.4 PAT 21 Industry Coating PIRT Activity STEP 10: PLAUSIBLE PHENOMENA BY PHASE AND SUBSTRATE See PIRT Tables Phasei Table 1: Normal Operation a
- Phase 2 Table 2: 0-40 sec after initiation of LOCA Phase 3 Table 3: 40 sec 30 min after initiation of LOCA Phase 4 Table 4: 30 min - 2 hrs after initiation of LOCA
+ Phase 5 Table 5: > 2 hrs after initiation of LOCA 4/12/99 INDUSTRY,PIRT. PRES _4 PPT 11 9
8 e
PRELIMINARY DRAFT Industry Coating PIRT Activity STEP 11: RANK COMPONENTS AND PHENOMENA FOR IMPORTANCE Ranking Scales High - Phenomena has a dominant impact on the primary
+
parameter ofinterest. Phenomena will be explicitly considered in the implementatic > of the SRTC research program.
Medium - Phenomena has a moderate influence on the primary parameter of interest. Phenomena will also be considered in the implementation of the SRTC research program.
Low-Phenomena has a small effect on the prin'ary parameter of
+
interest. Phenomena will also be considered in the implementation of the SRTC research program, to the extent possible.
4499 tNDUSTRV,mRT_POES.4 PDT 23 Industry Coating PIRT Activity STEP 11 RANK COMPONENTS AND PHENOMENA IMPORTANCE l
1 See PIRT Tables for ranking J
Phase 1 Table 1: Normal Operation a
Phase 2 Table 2: 0-40 sec after initiation of LOCA Phase 3 Table 3: 40 sec 30 min after initiation of LOCA Phase 4 Table 4: 30 min - 2 hrs after initiation of LOCA
=
Phase 5 Table 5: > 2 hrs afterinitiation of LOCA 4.2,99 fNOUSTRY,mRT PRES.4 PPT 24 12 l
n e
)
PRELIMINARY DRAFT Industry Coating PIRT Activity
SUMMARY
Industry PIRT Panel formed
- Two meetir.as held
- One PIRTdtveloped
- Additional Pib T scheduled
- First PIRT Reg ort due date established Working relationship with SRTC Research Project
- Ongoing contacts established and will be maintained
- Timely exchange of research findings planned Additional public meetings to be held, as warranted.
412/90
. Nous?* v, ART. PRES 4 Ppf 2'
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