Review of TDR Chapter 11 “Safety” F. Plewinski with thanks to C. Darve, O. Kirstein, R. Linander, A. Nordt

FINDINGS - 1 This chapter covers SAFETY including: General principles Nuclear safety Conventional facilities Accelerator Target Station Instruments Integrated Control System The chapter is 11 pages long which is very short to cover all safety aspects. It does not address the ESS licensing process. It is a very general abstract of major licensing documents: GSO, PSAR, EIA etc… TDR Internal Review, Lund, October 2012

COMMENTS - General General quality is very high for this chapter A lot of detailed comments and questions were added by all reviewers, in documents already transmitted to the chapter Editor A detailed summary was also transmitted and discussed prior to this review In this version 2, English was adjusted by the final corrector, some nuances were lost (or added) which raised questions from the reviewers… TDR Internal Review, Lund, October 2012

COMMENTS - 1 1. Does the chapter meet the requirements of the TDR Mission Statement?  Yes, globally 3. Is the content relevant to supporting the decision to proceed to construction? Yes PSAR and other docs shall be explicitly mentioned as “reference documents” concerning safety To avoid the TDR is interpreted (by SSM) as containing formal commitments TDR Internal Review, Lund, October 2012

COMMENTS - 2 Does the chapter adequately cover the entire area of its topic? This chapter is quite complete. “keywords” are missing: “Design Standards” and “Safety standards” Radiation protection and Dosimetry Emergency procedure and Training Communication, Guidelines and methodology 4. Is the content of the chapter properly balanced in length and in the depth of detail? No Conventional safety part shall be reinforced Sweden has a regulation: use it! Be prudent when adopting foreign “codes” which could not be compliant with Swedish regulation TDR Internal Review, Lund, October 2012

COMMENTS - 3 5. Does the chapter adequately address interfaces to other related systems described in other chapters? Some interfaces are maybe not completely addressed: external stakeholders: Safety Authorities and Environmental authorities should be mentioned Instrument scientist on access conditions to samples 6. Are there duplications or inconsistencies within the chapter, and/or between related chapters? No duplication in this chapter There are certainly duplications with other TDR chapters No time for reviewers to cross check them all There are inconsistencies with other TDR chapters TDR Internal Review, Lund, October 2012

COMMENTS – Inconsistencies Too many inconsistencies were found in the TDR (where it was explored by the reviewers) About ESS systems: ICS, especially PPS and TSS Confinement barriers (for TS and Exp. Halls) ESS system naming convention In definitions: Barriers and physical barriers Passive systems and Active systems This is a major issue all along the TDR v2 TDR Internal Review, Lund, October 2012

COMMENTS – 5 7. Does the chapter adequately address all phases of the ESS life cycle? Yes - See detailed comments Safety systems are defined independently from the life cycle perspective, which creates a risk of over-specifying them (e.g. Cooling circuits) 8. Are risks and potential risks properly addressed and handled? Yes – see detailed comments TDR Internal Review, Lund, October 2012

COMMENTS – 6 9. Are there some especially positive features that should be promoted and strengthened for the construction phase, and which would improve the TDR if emphasized more? ESS safety, even in case of very unlikely accidental scenario, is entirely based on passive systems ESS safety “philosophy” is simple and robust Operational experience gained from other facilities (SNS, JSNS) 10. Are there any critical remaining issues that you would like to address? A collective dose (1 man.Sv) is proposed and could be a constraint for middle term operation TDR Internal Review, Lund, October 2012

RECOMMENDATIONS Corrected English versions SHALL NOT modify the nuances Make sure the PSAR supersedes the TDR We shall not over specify safety Equilibrate the document (ToC) in favour of Conventional Safety: Add more references to standards and regulatory texts concerning Conventional Safety Be prudent when adopting foreign “codes” which could not be compliant with Swedish regulation Track and resolve inconsistencies: Set up dedicated groups to read through full TDR with a restricted point of view in mind (e.g. by searching keywords) Use existing Standards for main Vocabulary definitions TDR Internal Review, Lund, October 2012