SLOVENIAN ALARM AND MONITORING NETWORKS
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1 SLOVENIAN ALARM AND MONITORING NETWORKS Jasmina Kožar Logar, Denis Glavič-Cindro "Jožef Stefan" Institute,, Slovenia CHERNOBYL 25 YEARS LATER: STUDIES, REMARKS AND RECENT FINDINGS June , 2011 UDINE (Italy)
2 Facts about Slovenia 2 mio of inhabitants 20th birthday The smallest country in the world with NPP Other nuclear and radiation facilities First legislation (rules): 1977
3 Content Theory... Legislation and alarm and monitoring networks Authorities, organization, responsability WHAT to measure and WHY? WHO can do it? WHERE to sample? HOW MANY samples? HOW to measure?... and practice...
4 Slovenian Legislation in Force: Nuclear and Radiation Safety Ionising Radiation Protection and Nuclear Safety Act (ZVISJV) Decree on dose limits, radioactive contamination and intervention levels (UV2) Rules on radioactivity monitoring (JV10) Regulation on maximum permitted levels of radioactive contamination of human environment and on decontamination (Z9)
5 Authorities and Organization Ministry of environment and spatial planning Ministry of agriculture Ministry of Health and Public Agency Slovenian Nuclear Safety Administration SNSA (URSJV) Early Worning Network Monitoring KNPP Precipitation, soil, air, sea, rivers, Dose rate (TLD) Feedstuff Slovenian Radiation Protection Administration SRPA (URSVS) Foodstuff Drinking water
6 Authorization of Radiological Protection Units Authorization for performing environmental radioactivity monitoring is granted by SNSA (Slovenian Nuclear Safety Administration) Applicants should fulfill at least following conditions: that are registered for carrying out these activities in Slovenia that are accredited for methods concerning authorization by national accreditation body according to the ISO/IEC standard that have on disposal all the equipment that meets the minimal technical requirements that capabiliy of equipment exceeds for 30 % the authorised volume of measurements that participate at international intercomparison / proficiency tests
7 Nuclaear and Radiation Facilities in Slovenia URANIUM MINE Geol. Research: 1960 Operational: Closed: 2005 RESEARCH REACTOR 1966 REPOSITORY 1996 Krško Brežice KNPP 1974: beginning of construction 1981: first testing operation 1982: full power, regular operation 1983: comercial operation
8 Monitoring programmes in Slovenia Locations: without movable locations; Samples and analyses: without continous meas. ENVIRONMENTAL whole territory Loc. Samp Anal. 534 Liquid discharges NPP KRŠKO Atmospheric emissions Environmental URANIUM MINE RESEARCH REACTOR Emission monitoring Environmnetal REPOSITORY EMERGENCY???
9 Early Warning System Automatic ambient dose equivalent rate monitoring network 77 measuring stations - different institutions External gamma radiation hour dose rate results (nsv/h) Automatic report to EU system Free public access last 24 hours hystory results DIRECT CONECTON TO ALARM NETWORK (EMERGENCY)
10 Slovenian On-line Early Warning System Nova Gorica,
11 Alarm Network - Emergency Ministry of defence Administration of the Republic of Slovenia for Civil Protection and Disaster Relief Act on the protection against natural and other disasters 3 independent mobile units dose rate and contamination measurements with portable instruments, in-situ gamma ray spectrometry gamma ray spectrometry in mobile laboratory meteorological parameters continuous dose rate measurements with Ionization Chamber
12 MORAL th Regular Workshop on Mobile Radiological Laboratories - Intercomparison Measurements September 1999
13 Types of samples and analyses (KNPP) remarks location gamma H-3 Sr-90 TLD river filtered water, residue river sediment fish drinking water drinking water continous well precipitation water precipitation dry deposit air iodine filter air aerosol filter soil milk milk I-131 on pasture fruit vegetables meat / eggs TLD 3 circles+fence+ijs+croatia TOGETHER
14 Institut "Jožef Stefan" KNPP monitoring sampling points TLD 14
15 External gamma radiation measurements External gamma radiation measured with continuous measurements of dose OR Dose rate in air 1 m above the ground with: thermoluminiscent dosemeters dose rate meters with GM counters
16 Institut "Jožef Stefan" KNPP monitoring sampling points 16
17 Precipitation and dry deposition sampling Continuous sampling of fallout is performed by sampling of precipitations sampling of dry deposit on vaseline plates Detection limit for Pb-210 is less than 1 Bq per sample Besides gamma ray spectrometry, in precipitation samples strontium and tritium concentrations are determined
18 Open air radioactivity / aerosols sampling 2 independent sampling lines with different flow rates charcoal filters impregnating with TEDA (1.300 m 3 /month) for determining I-131 fiberglass aerosol filter for determining aerosols ( m 3 /month)
19 Soil sampling Soil (ground) is sampled on flat and uncultivated surfaces, for representative samples at least 3 subsamples from different locations are taken sampling with corers
20 Soil sampling conventional sampling method samples are taken from different depths for assessment of depth profiles stones and roots are removed from samples concentration of gamma ray emitters and strontium are determined
21 Measurement methods High resolution gamma ray spectrometry Beta spectrometry using proportional beta counter or liquid scintillation counter Alpha spectrometry using spectrometers alpha Continuous dose rate measurements Dose rate measurement with thermoluminiscent dosemeters In-situ gamma ray spectrometry
22 High resolution gamma ray spectrometry Gamma ray spectrometers should meet minimal technical requirements resolution: < 2.5 kev at 1.33 MeV calibrated range: 40 kev 2.70 MeV uncertainty of calibration: < 10 % relative efficiency: > 20 %
23 Liquid scintillation and beta spectrometry Tritium measurements electrolytical enrichment Strontium measurements
24 In-situ gamma ray spectrometry In-situ gamma ray spectrometers should meet minimal technical requirements resolution: < 2.5 kev at 1.33 MeV calibrated range: from 40 kev
25 Reporting WHAT? Measurement results Evaluation Trends Tranfer pathways Population groups Dose WHEN? Preliminary before next sampling According to the contract Regular and immediate HOW to WHOM? According to the organizational scheme Electronic form, paper work Interactive data base
26 Database with measurement results - ROKO Radioactivity in the Environment
27 Thank you for your attention 27
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