ISO INTERNATIONAL STANDARD 17873 First edition 2004-10-15 Nuclear facilities Criteria for the design and operation ofventilation systemsfor nuclearinstallationsotherthannuclear reactors InstallationsnucléairesCriterespourlaconception etI'exploitation dessystemesdeventilationdesinstallationsnucleairesautresqueles reacteursnucleaires Reference number ISO 17873:2004(E) @ISO 2004 d by IHS u Not for Resall ISO17873:2004(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In acceptsnoliabilityinthisarea. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at theaddress given below. ?ISO2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or isO'smemberbody in the country of the requester. ISO copyright office Casepostale56.CH-1211Geneva20 Tel.+ 4122749 0111 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland CoyeainalganizanfSandardizatio ISO 2004-All rights reserved Not for Resale ISO17873:2004(E) Contents Page Foreword iv Introduction 1 Scope 2 Normativereferences 3 Terms and definitions. 4 Functionsensured bytheventilationsystem.. 5 5 Safety aspects of ventilation systems. 5.1 General principles... 5.2 Risk assessment procedure .... 6 Principles of containment of radioactive material.. 6.1 General requirements ...... 8 6.2 Specificrequirements associatedwithcontainment systems... 12 6.3 Additional arrangements tolimittheriskof spreadof radioactivecontamination ... 13 6.4 Air-cleaning devices .... 13 7 Principlesofpreventionofotherrisks... 13 7.1 Preventionof risks linked toreleases of heat, gas ortoxicvapours..... 13 7.2 Preventionof riskslinkedtodepositionofmatterinventilationducts. 14 7.3 Prevention of fire hazard... 14 7.4 Consideration of external hazards. 17 8 Methodology for dimensioning ventilation systems. 18 8.1 Classification of the installation into working areas.. 18 8.2 Requirementsconcerningbasicventilationparameters 19 8.3 26 9 Recommendationsconcerningthemanagementandoperationofventilationsystems 27 9.1 Organization and operating procedures..... 9.2 Technical operating instructions.. 27 9.3 Operational managementissues. 27 9.4 Test procedures and maintenance. .28 9.5 Monitoring of the ventilation system. 9.6 Control of ventilation systems toprevent fire hazards... 30 10 Control and instrumentation .32 10.1 Control. 32 10.2 Instrumentation. 10.3 Alarms .33 AnnexA(informative)Exampleofclassificationofworkingareasaccordingtoradiological contaminationhazard.. .34 AnnexB (informative)Exampleof classificationof types ofventilation,accordingtoradiological contaminationhazard -Associatedrecommendedventilationconfigurations.... .36 AnnexC (informative)Requirementsforventilationfilters. 41 Bibliography 47 ationalOrganizationforstandardization'ghtsreserved ii Copyright Interr efrom IHS Not for Resa ISO17873:2004(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules give