1. DS407 CRITICALITY SAFETY 20th TRANSSC - Agenda Item 4.11
28th RASSC - Agenda Item 13.7
29th WASSC - Agenda Item 6.8
29th NUSSC - Agenda Item 6.8
Mr. G. Jones
Department of Nuclear Safety and Security
Division of Nuclear Installation Safety

2. Contents: DS407 CRITICALITY SAFETY Review documents development
Review Committee Members comments
Identify changes from the approved DPP
Present outstanding comments

3. DS407 CRITICALITY SAFETY DS407 Development: Approval of DPP: Drafting:
WASSC/NUSSC/RASSC/TRANSSC (Mar-April 2006)
CSS (November 2007)
Drafting:
CS in August 2007 (France, Germany, UK, USA)
CS in December 2008 (Canada)
CS in November 2009 (France, UK, USA)
Internal review in IAEA:
NSNI-RRSS January 2010
NSNI QA review February 2010
NS Coordination Committee March 2010
Draft 1 Posted on Safety Committees Website March 2010
236 comments received

4. Safety Standards Committee Comments
DS407 CRITICALITY SAFETY
Member
Safety Standards Committee Comments
WASSC
NUSSC
RASSC
TRANSSC
Algeria 2
Argentina 4
Belgium
ENISS 18
Egypt
Finland 20
France 58
ISO
Japan 28
Switzerland UK 37
USA 43
236 Comments (A = 198, R = 33, Outstanding = 5)

5. Safety Committee Comments:
DS407 CRITICALITY SAFETY
Safety Committee Comments:
Resolution of the comments resulted in:
Improved clarity of text
Additional recommendations
Consistency in terminology
Removal of redundant paragraphs
Editorial corrections
The resolution table and a revised safety guide (Draft 2) were posted on the Safety Committees Website one week before the first safety committee meeting (TRANSSC).

6. Main changes from approved DPP:
DS407 CRITICALITY SAFETY
Main changes from approved DPP:
New title:
DPP - “Criticality Safety”
Post Comment – “Criticality Safety for Facilities and Activities Handling Fissionable Material”
New content:
Chapter 6 “Planned Response to Criticality Accidents”
Bibliography
Temporary use of definitions

7. Remaining Comments: DS407 CRITICALITY SAFETY
5 comments outstanding, Japan (1) & USA (4)
Accept all comments
All relate to Chapter 3:
Explain the methods for determining the safety margins for Keff and controlled parameters
Add explanatory text relating to fault tolerance
Add guidance on what is to be inspected and surveyed when addressing the availability and reliability of safety measures

8. Requested action: DS407 CRITICALITY SAFETY
Safety committee approval to send Draft 2 to Member States for comment.

9. Thank you for your attention
DS407 CRITICALITY SAFETY
Thank you for your attention