Re: [SystemSafety] EN 50126/28/29 and MIL STD 882C - Differences

From: RICQUE Bertrand (SAGEM DEFENSE SECURITE) < >
Date: Wed, 15 Apr 2015 10:43:33 +0200


Will (pretend to) use MIL 882 when we seek to release the constraints …..

Bertrand Ricque
Program Manager
Optronics and Defence Division
Sights Program
Mob : +33 6 87 47 84 64
Tel : +33 1 58 11 96 82
Bertrand.ricque_at_xxxxxx

From: systemsafety-bounces_at_xxxxxx Sent: Tuesday, April 14, 2015 12:45 PM
To: M Mencke
Cc: systemsafety_at_xxxxxx Subject: Re: [SystemSafety] EN 50126/28/29 and MIL STD 882C - Differences

Hi Miriam,

Just on your last point, nope the dollar values or risk levels don't really correlate with SILs. The risk assessment backing those divisions is pretty high level, better to think of it as a high level organisational decision criteria (applied by the U.S. DoD) as to when it's appropriate in cost vs benefit terms to have a formal costed program where you pay for assurance products. Really it's more at the level of the program manager sniffing the air.

Note that just because you don't impose 882 on contract doesn't mean there's nothing done, but 882 when imposed does give the acquirer visibility, a broad framework and 'paid for' assurance products related to contractor efforts.

Matthew Squair

MIEAust, CPEng
Mob: +61 488770655
Email; Mattsquair_at_xxxxxx Web: http://criticaluncertainties.com

Dear all,

I was wondering if anybody has experience in the application of MIL STD 882C in the railway sector, and if there are any major differences between the application of the EN 50126/28/29 standards and this standard.

I do not want to (re) open a discussion about probabilistic risk assessment, but as far as I can see, one of the differences is that THR is not applied. However, occurrence of hazard categorization may be measured qualitatively or quantitatively, EN 50126 calls it "frequence of occurrence of hazardous events", whereas MIL STD 882C calls it "Hazard Probability Levels".

Appendix A provides guidelines for implementation of system safety program requirements, there is a matrix for "Small Dollar or Low Risk Program", "Medium Dollar or Average Risk Program" and "Large Dollar or High Risk Program", I was wondering if the first two programs could be considered approximately equivalent to SIL 1 and SIL 2 according to the EN standards, and the latter equivalent to SIL 4, but I understand that this would be a generalization.

Kind regards,

Myriam.



The System Safety Mailing List
systemsafety_at_xxxxxx
#

" Ce courriel et les documents qui lui sont joints peuvent contenir des informations confidentielles, être soumis aux règlementations relatives au contrôle des exportations ou ayant un caractère privé. S'ils ne vous sont pas destinés, nous vous signalons qu'il est strictement interdit de les divulguer, de les reproduire ou d'en utiliser de quelque manière que ce soit le contenu. Toute exportation ou réexportation non autorisée est interdite Si ce message vous a été transmis par erreur, merci d'en informer l'expéditeur et de supprimer immédiatement de votre système informatique ce courriel ainsi que tous les documents qui y sont attachés."

" This e-mail and any attached documents may contain confidential or proprietary information and may be subject to export control laws and regulations. If you are not the intended recipient, you are notified that any dissemination, copying of this e-mail and any attachments thereto or use of their contents by any means whatsoever is strictly prohibited. Unauthorized export or re-export is prohibited. If you have received this e-mail in error, please advise the sender immediately and delete this e-mail and all attached documents from your computer system."
#



The System Safety Mailing List
systemsafety_at_xxxxxx Received on Wed Apr 15 2015 - 10:43:52 CEST

This archive was generated by hypermail 2.3.0 : Tue Jun 04 2019 - 21:17:07 CEST