Radiological Protection Ordinance
(RPO)

¹ The li­cence hold­er must ad­opt ap­pro­pri­ate meas­ures to pre­vent fail­ures.

² The en­ter­prise must be de­signed in such a way that the fol­low­ing re­quire­ments are met:

a.

For fail­ures with an ex­pec­ted fre­quency of more than 10-1 per year, it must be pos­sible for the source-re­lated dose con­straints spe­cified in the li­cence to be com­plied with.

b.

For fail­ures with an ex­pec­ted fre­quency of between 10^–1 and 10^–2 per year, a single such event must not lead to an ad­di­tion­al dose which ex­ceeds the rel­ev­ant source-re­lated dose con­straints.

c.

For fail­ures with an ex­pec­ted fre­quency of between 10-² and 10-⁴ per year, the dose res­ult­ing from a single such event for mem­bers of the pub­lic must not be great­er than 1 mSv.

d.

For fail­ures with an ex­pec­ted fre­quency of between 10-⁴ and 10-⁶ per year, the dose res­ult­ing from a single such event for mem­bers of the pub­lic must not be great­er than 100 mSv; the li­cens­ing au­thor­ity may spe­cify a lower dose in in­di­vidu­al cases.

³ The en­ter­prise must be de­signed in such a way that only a small num­ber of fail­ures as spe­cified in para­graph 2 let­ters c or d can oc­cur.

⁴ For fail­ures as spe­cified in para­graph 2 let­ters c and d and for fail­ures which have an ex­pec­ted fre­quency of less than 10-⁶ per year, but which could have ma­jor im­pacts, the su­per­vis­ory au­thor­ity shall re­quire the en­ter­prise to ad­opt the ne­ces­sary pre­pared­ness meas­ures.

⁵ The su­per­vis­ory au­thor­ity shall spe­cify on a case-by-case basis the meth­od­o­logy and bound­ary con­di­tions for the ana­lys­is of fail­ures and for their as­sign­ment to the fre­quency classes spe­cified in para­graph 2 let­ters b–d. The ef­fect­ive dose or the equi­val­ent doses arising from fail­ure-re­lated ex­pos­ure of per­sons must be de­term­ined in ac­cord­ance with the cur­rent state of sci­ence and tech­no­logy, us­ing the as­sess­ment quant­it­ies and dose coef­fi­cients spe­cified in An­nexes 3, 5 and 6.

⁶ For en­ter­prises where fail­ures as spe­cified in para­graph 2 let­ter d may oc­cur, the su­per­vis­ory au­thor­ity may or­der:

a.

the meas­ure­ment of in­stall­a­tion para­met­ers which are re­quired to mon­it­or the course of an ac­ci­dent, to pro­duce dia­gnoses and fore­casts, and to de­term­ine the meas­ures ne­ces­sary to pro­tect the pub­lic;

b.

the con­tinu­ous trans­mis­sion of the in­stall­a­tion para­met­ers to the su­per­vis­ory au­thor­it­ies via a net­work tol­er­ant of an fail­ure.