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    Contra-expertise op bepalingen van radioactiviteit van afvalwater en ventilatielucht van COVRA N.V. Periode 2008

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    Authors
    Kwakman PJM
    Overwater RMW
    Series/Report no.
    RIVM rapport 610330126
    Type
    Report
    Language
    nl
    
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    Title
    Contra-expertise op bepalingen van radioactiviteit van afvalwater en ventilatielucht van COVRA N.V. Periode 2008
    Translated Title
    Contra-expertise on the determination of radioactivity of waste water and ventilation air of COVRA N.V. Period 2008.
    Publiekssamenvatting
    Het RIVM controleert achtmaal per jaar de metingen van COVRA . Het gaat hierbij om lozingen van radioactiviteit in water en lucht. De contra-expertise onderbouwt de betrouwbaarheid van de analyses die COVRA uitvoert. Doorgaans komen de afvalwateranalyses redelijk tot goed overeen, zo ook de meeste gammaspectrometrieresultaten, en de totaal-alfa, 3H en 14C resultaten in 2008. Enkele verschillen in 2008 betreffen lage activiteitsconcentraties voor 22Na, 60Co, 125Sb en 134Cs in afvalwater. De verschillen in de totaal-bèta meetwaarden van RIVM en de rest-bèta meetwaarden van COVRA zijn acceptabel, mede gezien het feit dat RIVM en COVRA verschillende meetprincipes toepassen. De meetresultaten in ventilatieluchtmonsters komen goed overeen.

    Het RIVM heeft in 2008 vier afvalwatermonsters en acht monsters van ventilatielucht geanalyseerd, die verspreid over het jaar door COVRA zijn genomen. Opdrachtgever is de Kernfysische Dienst van het ministerie van VROM.

    Within the framework of a monitoring programme, the RIVM measures the release of radioactivity into the waste water an atmosphere of COVRA N.V. Measurements are carried out eight times per year. This form of counterexpertise is aimed at verifying and supporting the reliability of the analyses carried out by COVRA . The two different sets of measurements are generally in agreement, as was also the case in waste water samples of 2008 for most of the gammaspectrometric results, the gross-alpha, 3H en 14C results. The few discrepancies that were observed in 2008 concern the presence of low activities of 22Na, 60Co, 125Sb and 134Cs in waste water. The differences in the gross-beta results from RIVM and the rest-beta results from COVRA are reasonable. This is regarding the fact that RIVM and COVRA apply different measuring principles. The results obtained by RIVM and COVRA in ventilation air samples are in good agreement.

    The RIVM analyzed four waste water samples and eight samples of ventilation air taken by COVRA at various time points dispersed throughout 2008. The analyses were carried out on behalf of the Department of Nuclear Safety, Security and Safeguards of the Dutch Ministry of Housing, Spatial Planning and the Environment (VROM).
    Description
    Dit rapport is eerder vertrouwelijk uitgebracht als briefrapport 610330091. Dit is besproken met de VROM-opdrachtgever en vertegenwoordigers van de betreffende nucleaire installatie: het commentaar op het rapport is verwerkt, voorzien van een Rapport in het Kort, en mag openbaar worden als RIVM rapport. <br>
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    VROM Kernfysische Dienst
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