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    Contra-expertise op bepalingen van radioactiviteit van afvalwater en ventilatielucht van COVRA NV : Periode 2015

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    Authors
    Kwakman PJM
    Overwater RMW
    Series/Report no.
    RIVM rapport 2016-0155
    Type
    Report
    Language
    nl
    
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    Title
    Contra-expertise op bepalingen van radioactiviteit van afvalwater en ventilatielucht van COVRA NV : Periode 2015
    Translated Title
    Contra-expertise on the determination of radioactivity in waste water and ventilation air of COVRA N.V. : Period 2015
    Publiekssamenvatting
    Het RIVM controleert acht keer per jaar de metingen die de Centrale Opslag voor Radioactief Afval (COVRA) verricht in lozingen van radioactiviteit in afvalwater en ventilatielucht. Deze 'contra-expertise' dient als controle op de betrouwbaarheid van de analyses die COVRA zelf uitvoert. De te analyseren monsters worden verspreid over het jaar door COVRA genomen.

    In 2015 zijn alle drie de monsters van afvalwater en acht monsters van ventilatielucht geanalyseerd. Doorgaans komen de analyses overeen met de resultaten van de COVRA, zo ook in 2015.

    De analyses van het RIVM en COVRA in de gamma-spectrometrische resultaten, de resultaten van de totaal-alfa bepaling, tritiumbepaling en de 14C-bepaling in afvalwater kwamen goed overeen. Hoewel het RIVM en COVRA verschillende meetprincipes gebruiken, komen de totaal bèta- meetwaarden van het RIVM en de rest bèta-meetwaarden van COVRA in 2015 goed overeen.

    Ook kwamen de analyses van het RIVM en COVRA betreffende de ventilatieluchtresultaten van het Afvalverwerkingsgebouw (AVG) en het Hoogradioactief Afval Behandelings- en OpslagGebouw (HABOG) goed overeen.

    Het RIVM heeft de contra-expertises in 2015 uitgevoerd in opdracht van de Autoriteit Nucleaire Veiligheid en Stralingsbescherming (ANVS).
    Eight times per year RIVM measures the release of radioactivity into waste water and atmosphere of COVRA. This form of counter-expertise is aimed at verifying and supporting the reliability of the analyses carried out by COVRA. The waste water samples and samples of ventilation air are taken by COVRA at various time points dispersed throughout the year. In 2015 all three waste water samples and eight samples of ventilation air were analyzed. The two different sets of measurements are generally in agreement, as is also the case in 2015. The agreement in the results for gamma-emitters, gross alpha, tritium and C-14 was good. Considering the fact that RIVM and COVRA apply different measuring principles the agreement in the gross beta results in waste water is good.

    In ventilation air samples of the waste treatment building (AVG) the results for gross alpha and gross beta, 3H and 14C obtained by RIVM and COVRA are generally in good agreement. In ventilation air samples from the high activity waste storage building (Habog) the agreement was also good.

    RIVM carried out this counter-expertise on behalf of the Authority for Nuclear Safety and Radiation Protection (ANVS).
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    Autoriteit Nucleaire Veiligheid en Stralingsbescherming (ANVS)
    URI
    http://hdl.handle.net/10029/620821
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    RIVM official reports

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