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    PWR steam generator section cleaning procedure
    3.
    发明专利
    PWR steam generator section cleaning procedure 未知

    公开(公告)号：FR2765720A1

    公开(公告)日：1999-01-08

    申请号：FR9708285

    申请日：1997-07-01

    Applicant: FRAMATOME SA

    Inventor： TEXIER CHRISTOPHE ,  GUILLERMIER PIERRE ,  GENTIL CHRISTINE

    IPC: F22B37/48 ,  F28G9/00 ,  G21C17/017 ,  G21D5/12

    Abstract: The cleaning procedure consists of injecting a chemical solution into the secondary section of the steam generator (1) through one of the following circuits: the normal feed circuit (8), the emergency feed circuit (10), or the purging circuit, using a reagent injection pump (21) set in a branch of the injection circuit. The chemical solution is a complexing agent containing ethylenediamine- tetraacetic acid, a reducer such as hydrazine and a corrosion inhibitor. It is kept at a predetermined temperature by circulating it with the aid of cooling water at the appropriate temperature in the primary circuit, and it is evacuated through the purging circuit once the pollutants have been dissolved. The circuit is then rinsed with demineralised water from a tank in the emergency feed circuit.

    4.
    发明专利
    未知

    公开(公告)号：FR2743064A1

    公开(公告)日：1997-07-04

    申请号：FR9515581

    申请日：1995-12-27

    Applicant: FRAMATOME SA

    Inventor： GUILLERMIER PIERRE ,  TEXIER CHRISTOPHE ,  ORGANISTA MANUEL

    IPC: C02F1/00 ,  C02F1/32 ,  C02F1/72 ,  C02F1/78 ,  G21F9/06

    Abstract: Treating aqueous acid effluents which contain an organic feed stock, an organic reducing agent and nitrate ions and which result from the decontamination of nuclear power station components comprises: (i) adding to the effluent at least one oxidising agent (ozone and/or hydrogen peroxide); and (ii) exposing the effluent to UV radiation. This neutralises the effluent by converting the organic feed stock into water and carbon dioxide, plus perhaps oxides of elements present in the feed stock. Also claimed are: (i) a process of treating different types of effluent (products of oxidising, reducing and rinsing stages) resulting from the decontamination of nuclear power station components comprising treating each effluent separately according to above before removal and, possibly, demineralisation; (ii) treating effluents resulting from the oxidising and reducing stages of the decontamination of nuclear power station components by mixing the two effluents and then treating the mixture according to the above process before removal and, possibly, demineralisation; and (iii) a device for the application of any of the above processes comprising a circulation loop for the liquid effluent with: (1) a storage container (possibly including a device for mixing the effluent); (2) a device to make the effluent circulate around the loop; (3) a device for injecting a liquid or gaseous reactive (H2O2/O3) into the loop; and (4) a source of UV radiation.

    6.
    发明专利
    未知

    公开(公告)号：DE69400559T2

    公开(公告)日：1997-02-06

    申请号：DE69400559

    申请日：1994-07-04

    Applicant: FRAMATOME SA

    Inventor： GUILLERMIER PIERRE ,  BLOCQUEL ALAIN

    IPC: B23H3/08 ,  G21C17/07 ,  G21C19/02 ,  C25F3/02 ,  C25F3/14 ,  C25F7/00 ,  G21C21/00

    Abstract: An electrolyte is circulated between the surface to be machined, charged to an anodic potential, and a working electrode (9') charged to a cathodic potential. The electrolyte contains lithium nitrate as sole active element at a concentration of between 20 g/l and 2350 g/l and preferably between 50 g/l and 250 g/l. The method can be applied to machining the surface of any metallic part and especially to machining the inner surface of tubular parts (5) such as nuclear reactor vessel bottom head or head penetrations; in this case, the electrochemical machine cell consists of a cylindrical working electrode (9') placed inside the part to be machined.

    8.
    发明专利
    未知

    公开(公告)号：DE69400559D1

    公开(公告)日：1996-10-24

    申请号：DE69400559

    申请日：1994-07-04

    Applicant: FRAMATOME SA

    Inventor： GUILLERMIER PIERRE ,  BLOCQUEL ALAIN

    IPC: B23H3/08 ,  G21C17/07 ,  G21C19/02 ,  C25F3/02 ,  C25F3/14 ,  C25F7/00 ,  G21C21/00

    Abstract: An electrolyte is circulated between the surface to be machined, charged to an anodic potential, and a working electrode (9') charged to a cathodic potential. The electrolyte contains lithium nitrate as sole active element at a concentration of between 20 g/l and 2350 g/l and preferably between 50 g/l and 250 g/l. The method can be applied to machining the surface of any metallic part and especially to machining the inner surface of tubular parts (5) such as nuclear reactor vessel bottom head or head penetrations; in this case, the electrochemical machine cell consists of a cylindrical working electrode (9') placed inside the part to be machined.

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