1. Rules for Mechanical Design and Pressure Testing for Detector vessel
Nathalie de Ruette
Detector Lab Coordination officer
European Spallation Source ERIC

2. Need to Fulfil European and Swedish Laws, and ESS Rules
AFS 2016:1
Pressure retaining equipment
ESS Rules for Quality Regulation
- Mechanical Equipment
PED 2014/68/EU
EN 13458
AFS 2017:3
Use and inspection of pressurize equipment
SSM Special conditions for ESS in Lund
ESS requirements
Swedish radiation Safety Authority
EN 13445
Code RCC-MRx
AFS 2006:8 Overpressure testing
EN 13480

3. CoC – Certificate of Compliance/Conformity
What are the requirements?
CoC – Certificate of Compliance/Conformity
Documentation before starting manufacturing/Installation
Documentation after Manufacturing/Installation

4. 1. Determine Quality Classes
Safety classes regarding emission of radioactive substances: MQC1 – 4
Based on the risk assessment (see ESS and ESS )
MQC4: the design and manufacture of pressure equipment where deficiencies or malfunctions will not cause emission of radioactive substances
Assume no emission from detector vessels
Argon activation very small:
E. Dian, K. Kanaki, R.J. Hall-Wilton, P. Zagyvai, Sz. Czifrus,
"Neutron activation and prompt gamma intensity in Ar/CO2-filled neutron detectors at the European Spallation Source",
Applied Radiation and Isotopes 128C (2017) pp , DOI: /j.apradiso , arXiv:
Inspection classes are important for slide 6
Insist on the complexity of the classification

5. 1. Determine Quality Classes
For MQC4, the regulations AFS 2016:1 (PED, 2014/68/EU), AFS 2016:2 and AFS 2017:3 issued by the Swedish Work Environment Authority apply.
AFS 2017:3 defines inspection class A-B-C
Inspection classes are important for slide 6
Insist on the complexity of the classification
Pressure Vessel

6. Find PED Category of a Vessel
PED Category Calculator
Inert
Reactive
We are investigating the implications of operating at 0.5 bar

7. Find PED Category of a Vessel

8. Minimum documentation after manufacturing
2. Documentations
Minimum documentation after manufacturing
Most documents already exist

9. 3. Inspection and Testing requirements
ESS Inspection Points, “EIP”: Describe the scope of the inspection ESS Examination Procedures “EEP”: gives references and instructions (scope, performance, acceptance criteria and reporting) for each EIP ESS RESSQ-Mech Part C - Table of Contents of ESS Examination Procedures (EEP)
EIP and EEP are different for each class (safety and inspection). More requirements for MQC2-3 than 4 and also for A-B than C.

10. Example of EIP
MQ: compulsory in house inspection and testing carried out and doc by external provider.
EQ Independent review, inspection, testing by inspection organization of ESS
A2 Accredited body according to PED

11. Example of EEP Pressure testing with gas only.
AFS 2006:8 TESTING WITH OVERPRESSURE OR UNDERPRESSURE
Pressure testing with gas only.
The requirement on accreditation does not apply if:
The control pressure is 0.03 bar or lower
The control pressure is not more than 3 bar and P x V is not greater than 30 bar x litre

12. 4. Detector Vessel Pressure Testing
We need to follow the regulations (AFS 2006:8)
P x V > 30 bar x litre!
Can we do the testing inhouse? Yes, if:
we use liquids (water), or
we reduce the volume of the vessel, or
we get accreditation for the people (≈ 10 already accredited)
and facility (long and complicated).
Otherwise, we need to outsource the testing to an accredited body.

13. It’s complicated!!! We need help!
Conclusion
It’s complicated!!!
We need help!
Try to avoid complications whenever possible by staying in MQC4-C and outside the PED
Quality could not provide the support needed
Possible to stay in MQC4 but maybe not outside PED

14. What do we need to do to: Purchase mechanical equipment
Manufacture mechanical equipment in-house and outsourced
Purchase installations and repairs
Install or repair under own management

15. Mechanical Equipment:
Generic term for equipment or components that serve to:
Receive external or internal pressure
Bear mechanical loads
Protect such pressure- and load bearing equipment referred to in the first and second indents (above)
Hold or control components in the intended manner
Include supports, holders, hangers and locking devices (not for lifting or moving components).

16. ESS Examination Procedures
EEP 2-7XX = Examination of base material and finished part EEP 3-7XX = Examination of manufacturing, welding and other joining EEP 4-7XX = Examination of completed mechanical equipment or subassemblies EEP 5-7XX = Examination of installation, welding and other joining EEP 6-7XX = Examination of completed installation of a system, parts of a system or repair of installed equipment

17. CHESS

18. CHESS