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Recent regulatory developments in the control of radon exposure in Spain May 17, 2012

Recent regulatory developments in the control of radon exposure in Spain May 17, 2012. Marta García-Talavera , José Luis M. Matarranz, Rosario Salas, M.ª Teresa Sanz, Lucila Ramos Radiological Protection Deputy Direction Consejo de Seguridad Nuclear (CSN). Outline. Introduction

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Recent regulatory developments in the control of radon exposure in Spain May 17, 2012

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  1. Recent regulatory developments in the control of radon exposure in Spain May 17, 2012 Marta García-Talavera, José Luis M. Matarranz, Rosario Salas, M.ª Teresa Sanz, Lucila Ramos Radiological Protection Deputy Direction Consejo de Seguridad Nuclear (CSN)

  2. Outline Introduction Legislative framework Regulatory guidance Mapping radon-prone areas Future work

  3. 01 SPAIN FACTS • 47,190,493 inhabitants (87 p/km2) • Mostly concentrated along the coast and Madrid • Less than 3% dwellings in ground or first floors • Diverse geology: western Hercynian and eastern Alpine areas

  4. BSS Directive 96/29/EURATOM 02 LEGISLATIVE FRAMEWORK Ministry for Public Works (TBC) new dwellings Regional Governments existing dwellings workplaces RD 783/2001 – 1439/2010 workplaces CSN Instruction 33 www.csn.es wp & dw CSN SG 11.01, SG 11.02, SG 11.04 Regulatory documents

  5. 02 LEGISLATIVE FRAMEWORK Existing dwellings New development …at home • Reference level: 300 Bq/m3 • Design objective: 100 Bq/m3 (TBC) PROTECTION CSN SG-11.02 • Reference level : 600 Bq/m3 (or 300 Bq/m3) • Graded approach to regulation: 1000 Bq/m3 • Compulsory risk evaluation at workplaces: below ground; containing a groundwater source; at radon-prone areas …at work CSN IS-33

  6. 03 REGULATORY GUIDANCE CSN SG-11.04on the Methodology for radon studies at workplaces THE NUCLEAR SAFETY COUNCIL Total Error Detector Error Model Assumptions Sampling Error ? ? up to 200-300% 10-20% F, OF, etc. Rn level Detector Analysis Ann. Dose DETAILED EXPOSURE ASSESSMENT BASIC SURVEY

  7. Measuring Sampling plus measuring 03 REGULATORY GUIDANCE SG-11.04 • 1 year sampling period – in some cases 3-6 month(Oct-Apr) • Homogenous zones (1 detector/HZ; 1 detector/100 m2) Rn diurnal variation (CWT/C24h): Equilibrium factor (F): • Long-term or continuum meas. (as appropriate) • F-value representative of working conditions • Continuum measurements • At least over 5 non-consecutive days Statistical demonstration of compliance UCL0.90 Reference Level

  8. n <5 n <10 n <15 n <25 04 RADON MAPPING Radon-prone areas Type I: x90 = 300 Bq/m3 Type II: x90 = 600 Bq/m3 long-stay buildings, schools all workplaces IS 33

  9. CA2 86% CA1 04 RADON MAPPING g Dose rate (mR/h) Rn in dwellings (Bq/m3) H 2 120 Type II 14 M 1 70 Type I 7.5 L 0 UCLx90= GM exp[g’1-a,n-1 ln(sGM)] 430 municipalities n > 6

  10. Y Y > > > > < < N N gCat 1 gCat 2 04 RADON MAPPING Rn measurements avaliable for town? Compute UCLX90 n > 11 600 300 Type II Type I 600 300 Compute UCLX90 Rn measurements avaliable for Geo Unit? Measuring campaign 2013-2014

  11. 05 FUTURE WORK • Database maintenance and reassessment of radon-prone areas • Public awareness and education programmes • Institutional cooperation and stakeholder involvement • Collaboration in TBC developments

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