VLT-TRE-ESO-15730-4546-PRIMET safety and reliability
Contents
1. ES EUROPEAN SOUTHERN OBSERVATORY E Organisation Europ enne pour des Recherches Astronomiques dans l H misphere Austral Europ ische Organisation f r astronomische Forschung in der s dlichen Hemisph re VERY LARGE TELESCOPE Prima Metrology Safety and Reliability Analysis Doc No VLT TRE ESO 15730 4546 Issue 1 Date 02 04 08 Prepared 9 Leveque Name Date Signature Approved F Delplancke M Boecker Name Date Signature Released R Gilmozzi Name Date Signature VLT PROGRAMME TELEPHONE 089 3 20 06 0 FAX 089 3 20 23 62 VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 1 of 23 Change Record Issue Rev Date Section Page affected Reason Remarks 1 02 04 08 all y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 020205 2 of 23 Table of Contents 1 Scope AAA 3 2 Applicable and reference Documents 3 3 CronymSs eege 3 4 Description of PRIMET aa 4 5 PRIMET Safety ae 8 5 1 List of possible 8 5 2 Laser Hazards and Safety Interlock system 9 5 2 1 Introduction eese e hene nemen rennes 9 5 2 2 PRIMET Laser source and specification for eye protection 9 5 2 3 PRIMET laser beam propagation and power levels 12 5 2 4 Protection against laser hazards 13 5 2 5 Laser I2. 1 PRIMET is considered free from mechanical hazards There is no sharp edge and no injury or damage can occur by unwanted activation of any motors PRIMET has no moving parts All PRIMET components are rigidly attached to optical tables and secured against Eathquakes The tables themselves storage room VLTI lab are bolted to the ground or equipped with Earthquake Restraints The electronic cabinets located in the storage room will be secured with steel cables fixed to the ceiling as it is cur rently done for other instruments The PRIMET control electronics follows the rules of AD 3 It is using VLT standard components LCU crate boards cables etc or commercial components with CE marking All cables are protected properly secured and relayed through cable trays It follows the same approach as for any other VLTI Instrument already installed at Paranal No electrical safety issue is identified Fiber connectors are all standard industrial FC PC or FC APC fibers cable are routed inside special conduct protection against mechanical damage During operation no significant heat is produced inside the VLTI lab only about 16 W produced by all 8 quadcells The heat produced inside the storage room is properly absorbed by the cooling system see AD 7 All PRIMET tem perature controlled components I2 cell at 70 deg SHG oven at 50 deg and laser driver are protected by insulation material no skin burning possible and are also protected
3. Coude End Point T1 End Point T2 End Point T2 End Point TI Figure 2 PRIMA Metrology hardware Overview green lines represents optical fibers The red and blue lines are free space laser beams superimposed on the stellar beams v c A represents the fre quency of the laser Go IFC2 LAB Amber Midi gt 5 E 8x quadcell cables actuator cables TBC PRIMA FSU A i 82 8xMM Fibers gt 2 gt 2 5 45 gt z S a fO lt c Je 2 d i enclosure an d Laser stabilization HW Heterodyne assembly E 2 2 IFOTZLAB Amber 5 5 SxSM PM Fibers Midi B PRIMA FSU B D D Optical table d E IFIPZVLTI S CH IFCR C2 IFC1ZOT S LAN TIM Power Cooling SCPZ31 5 IFCR C1 S x Power Cooling SCP 31 IFIP C3 ane es LAN TIM 2 Storage room IC104 IFCR C3 E Power SCP 31 VLTI L AB a LA o amp Figure 3 Overview of the Metrology HW located in the Storage room IC104 All Interface IFXX XX are described in AD 7 The laser beams are 5 carried from the storage room inside the enclosure to the VLTI lab using optical fibers y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 8 of 23 5 PRIMET Safety 5 1 List of possible hazards Table 1 lists the possible hazards following the classification given in AD 1 appendix C3 However only a subset is applicable to PRIMET as indicated in Table
4. Errors of Fitting or Faulty Assembly Breakage during operation Falling or ejected Objects and Liquids Loss of Stability toppling over of machine Slipping Tripping Falling of persons 5 2 Laser Hazards and Safety Interlock system 5 2 1 Introduction Laser safety is part of the ESO general safety regulations documented in AD 2 This document defines the laser clas sification as well as the necessary controls engineering administrative etc associated to their safe operation 5 2 2 PRIMET Laser source and specification for eye protection PRIMET operates one of the following Infrared laser wavelength 1319 nm Both laser have a fiber output which confines the laser beam 1 Innolight laser see AD 8 According to its documentation this laser complies with the Federal Register 21 CFR 1040 10 Laser Safety Standard and is CE marked The maximum power at the output of its pigtailed fiber is 340 mW A 1319 nm 2 Also a spare laser is available in case of failure of the Innolight laser The spare laser is a Lightwave laser 125 see AD 9 It is Class IIIb defined by the Federal register 21CFR 1040 10 and conforms to EN60825 1 1994 Standard for safe use of lasers defined in ANSIZ136 1 This Laser is CE marked and the maximum power at the output of its pig tailed fiber is 210 mW A 1319 nm Both lasers corresponds to a class IIIb defined in AD 2 Radiation in this class is very likely to be dangerous For a continuous wave laser the m
5. during its 10 years lifetime i e a total of 43800 hours However in practice PRIMET will only be used during PRIMA runs which should occur typically by blocks of 10 to 15 days and at most every month So a more realistic duty is I2hoursx15daysx12monthx10years z21600 hours Preventive maintenance will be performed during day time as well as any necessary replacement of components in case of failure Any component of PRIMET can be replaced in less than 8 hours i e MTTR lt 8 hours including potential re alignment provided that a spare unit is available The most critical components of PRIMET are located inside the storage room and do not require access to the inter ferometric laboratory for repair Access to the laboratory will be only required if a quadcell detector fails two spares are available and MTTR 2 hours a fiber transmitting the laser signals is damaged spares available and already routed see AD 7 The replacement by a spare fiber is instantaneous but it then requires re alignment as described below the PRIMET optics must be re aligned MTTR lt 8 hours During the PRIMET testing in Garching a re alignment was only necessary if a major intervention on the FSU optics had occurred The stability of the PRIMET beam injec tion extraction opto mechanics is such that no re alignment is necessary at a scale of several months The list of components with potential failure are listed below It includes the PRIMET electronic pa
6. station azimuth platform 1x fiber pair from UTX NAP 240V XX A Power Figure 10 Safety equipment for the UT1 2 3 4 Coude rooms y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 17 of 23 VLTI Lab IC108 Override amp Lock out Electronic box Size 84x194x60mm Magnetic Door Buzze Magnetic Door switch switch overide switc Lock out button Feedthrough Door 2 Door 1 Light indicator Laser ON OFF Access control Electronic box Size 400x300x190 Buzz Buzzer switch Entry request Access control Key pa Ante Chamber VLTI Lab Ante IC105 240V XX A Chamber Power Copper network cable to storage room Figure 11 Safety equipment for the accessing the VLTI laboratory IC108 VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 18 of 23 Interlock Monitor Electronic box Size 400x500x190 Storage room IC 104 Override amp Lock out Electronic box Size 84x194x60mm 240V XX A Power Buzzer Magnetic Door 1xfiber pair to 5 2 gt CR switch overide switch 1xCopper network cable to VL
7. ON Eco PROTECTOR SHIELD Artikelnummer O06 T0600 O07 TOOS6 00 TO096 00 15 TOO36 00 017 TOCB6 00 Oe TG DIR 850 900 12 12 L2 Lz L2 L2 O 10600 11000 L2 t2 L5 Figure 5 Filter T96 used on the safety Glasses purchased for the PRIMA Metrology Protector L 08 with T96 filter All Star L 02K with T96 filter from LaserVision www lvg com Aufbewahrungsbe h lter Augenschutz Ref 111 0021 from http de vwr com app catalog Prod uct article number 111 0021 Figure 6 laser goggles for PRIMET left Protector L 08 right All Star L 02K VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 12 of 23 5 2 3 PRIMET laser beam propagation and power levels The PRIMET laser head is located inside an opaque metallic enclosure where part of the laser beam propagates in free space beam diameter 2 mm max power 340x0 25 85 mW for frequency stabilization purpose The rest of the beam is split in 4 and leave the enclosure through 4 optical fibers towards the VLTI lab Inside the VLTI lab the 4 x beams are collimated into 1 mm diameter beams are superposed to the stellar beams and propagates in free space along the VLTI optical train towards the Star separator of the telescopes UTs or AT s Each beam has a maximum power of 50 mW whereas the power required during operation is only about 10 mW For the UT s the beams propagates in free space insid
8. TI Ante Chamber Lock out button Feedthrough Buzzer Light indicator Laser ON OFF Buzzer switch Entry request Access control Key pad Corridor IC 106 Figure 12 Safety equipment for the accessing the storage room IC104 10x LED Display Figure 13 Display of the interlock Status y VLT TRE ESO 15730 4546 89 24 Prima Metrology Safety Reliability Analysis 1 02 04 08 19 of 23 Figure I4 Lock out station located on the azimuth area of each UT where a new lock out switch will be installed to interlock the laser during work in the Nasmyth adaptor or in the Coude optical train y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 20 of 23 5 3 Hazard Identification and Risk Estimation The identification of the hazardous events and the estimation of the associated risks follows the Method provided in AD 1 The Hazard Severity Classification the Hazard Occurrence Frequencies and the Hazard Risk Acceptance Rejection Matrix are defined in AD 1 The analysis shows that hazard classification of PRIMET can be ranked Class III tolerable risk transport only and Class IV negligible risk for all other phase of the project Under consideration of all hazards and protective measures PRIMET can be used without any risk Table 4 Risk estimation Transport Hardware damaged Special Packing designed for Marginal Rare delicate instrumentation includ Class lll
9. VLT area concerned by the PRIMET laser shall be trained by the Paranal Safety officer in coordination with the supervisors responsible for the area VLTI storage room and laboratory VLTI tunnel UT coude room AT UT Coude and azimuth nasmyth platform Any operation using the PRIMET laser shall be performed in coordination with the VLT VLTI managers During the Assembly Integration and Verification phase of PRIMET the Paranal safety officer will receive an exten sive training related to the maintenance and operation of PRIMET Figure amp Warning signs 5 2 5 Laser Interlock system based on safety PLC s All Controlled laser area defined Table 3 will be controlled by a Siemens safety PLC system The system consists of decentralized periphery modules with I O connections Simatic ET200S connected in a star network to a CPU S7 317F The CPU will control the interlock input of the laser driver The system operates with Profinet distributed via multimode fibers Each ET200S will guaranty access control and lock out as described in the following figures The status of the laser ON or OFF will be indicated by a light at the entrance of all Controlled laser area Access will be granted by typing the right code on a key pad The interlock is then overridden for some seconds delay adjustable to allow access to authorized people even if the laser is ON Similarly when going out of these areas without triggering the laser interlock a
10. against over heating All cables are halogen free and fire resistant No thermal hazard is identified PRIMET is considered free from Hazard Generated by Materials and Substances Only the heat exchangers of the electronics cabinets ESO standard are connected to cooling fluids provided by the Paranal Service Connection Points The impact if Human error will be minimized by allowing access and operation of PRIMET only to trained people who will also follow the ESO amp Paranal safety regulation Failure of power supply or control system will not cause any hazard The PRIMET infrared laser source represents the major source of potential hazard Section 5 2 details the origin of the hazard as well as the associated safety equipment to be installed Table 1 Hazard List Hazards List Applicability to PRIMET Mechanical Hazards Electrical Hazards Thermal Hazards Hazard due to Vibration Hazard generated by Radiation Hazard Generated by Materials and Substances Cooling Liquid Hazard generated by Noise y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 9 of 23 Table 1 Hazard List Hazard generated by Neglecting Ergonomic Principles YES Hazards in conjunction with the deployment environment Combination of Hazards Unexpected Start up Lack of opportunity to Stop Shut down in Optimum Position Variation in Rotational Speed Failure of Power Supplies Failure of Control System
11. aximum output into the eye must not exceed 500mW The radiation can be a hazard to the eye or skin However viewing of the diffuse reflection is safe y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 10 of 23 Both lasers have an interlock input Based on AD 2 the following actions will be implemented e The laser beam will be enclosed as much as possible e Signs and labels will be posted adequately e Controlled laser area will be defined with access control and interlock triggering e Warning system will be implemented to notify when the laser is operated e The laser will only be operated by trained people e eyewear protectors will be available Definition of the Eye protection level The method described in RD 1 p 32 is used to define the Eye protection level e Determine the minimum laser beam diameter to which a person might be exposed under reasonably foresee able circumstances The worst case occurs when an operator looks directly at the tip of the fiber pigtailed laser The minimum laser beam diameter corresponds to the size of the eye pupil i e d 0 7mm e Calculate the cross sectional area of the beam at this point 12 4 3 85 m Calculate the average power density at this point by dividing the average power of the laser by the beam area For this we take the maximum power level of P 0 35 W which leads to a density of D 0 35 3 85e 9 1 e W m lt let W m e Look u
12. e the Coude room where they are retroreflected back to the VLTI laboratory and detected However less than half of the power 15 reflected by and propagates through the VLT opti cal train up to the primary mirror of the UT straylight For the AT s the beams are confined inside the AT optical train e laser fiber Foutput fibers to VLTI lab pigtailed rag TEN free space laser beam Sc inside the enclosure a 1529 H7 mae uL Figure 7 View of the laser head and of the laser frequency stabilization system inside its enclosure Inside the enclosure part of the laser beam propagates in free space beam diameter lt 2 mm max power 340x0 25 85 mW The laser beams leaving the enclosure are contained in optical fibers Table 2 Laser beam propagation Location Max free space Beam diameter Laser power W Fei e gt e ent un c ent c 5 2 4 Protection against laser hazards rs Table 3 Definition of the protection foreseen against laser hazards c e Storage Room Controlled laser area with key pad access control 4 E At the entrance door Safety goggles available cem Flashing light when the laser in ON x On the enclosure Warning labels The enclosure cannot be removed without tools VLTI laboratory Controlled laser area with key pad access control At the entrance door Safety goggles available Flashing ligh
13. etrology Safety Interlock System Block diagram Baseline Star Network centered on the VLT Control Room Access Control VLTI lab Override amp lock out VLTi Ante Chamber IC108 Already existing fibers Access Control New fibers length amp Override amp Lock out routing TBC VLTI Area ET200S Patch 1 1UT1 NAP gt VLT CR Row B port 5 6 free ports 4 Access Control Access Control Override amp Lock out Patch 1 UT2 gt VLT CR Row port 5 6 free ports Laser interlock Access Control Override amp Lock ou 1x fiber pair XX Patch 1 UT3 lt fiber pair XXm Access Control Override amp Lock out Patch 1 UT4 NAP VLT CR Row C Port 9 10 free ports 5 ET200S 1x fiber pair Figure 9 Overview of the layout y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 16 of 23 Coude Room UT1 UT2 UT3 UTA Magnetic Door Buzzer ae switch Override and lock out Electronic box Size 84x194x60mm overide switch T Lock out button 3 Light indicator Laser ON OFF Access control Electronic box Size 400x300x190 Buzzer rri d O Buzzer switch Entry request Access control Key pad EE Lock out button UT lock out
14. lock out button must be pressed to override the interlock for some seconds If someone enters the lab storage amp coude rooms without entering the code non authorized persons the interlock will be triggered and the y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 15 of 23 laser goes OFF or if it was already OFF it cannot be switched ON without resetting manually the interlock This con figuration is compatible with daily operation in the lab storage amp coude rooms with authorized personnel By default the laser will always be off during day time unless PRIMA engineering activities must be carried out For the UT a laser lock out button will be available to interlock the laser whenever some work has to be performed inside the Nasmyth adapter or inside the Coude structure e g operation on the mirrors M4 M5 M6 M7 or M8 This new laser lock out button will be added to the current Lock out Station or close to it It will be physically connected to the ET200S located at the entrance of the coude room inside the access control electronics box A status display located in the storage room will show the status of the laser and of all interlocks This information will also be available on the Prima metrology GUI If the interlock is triggered we will know immediately where it has been triggered Details about the design and wiring of the interlock system can be found in RD 2 PRIMA M
15. m the storage room to the VLTI laboratory using optical fibers Once in the VLTI laboratory the laser beams are collimated into 1 mm diameter beams and propagate in free space along the VLTI opti cal path up to the Star separators of the UT s or the AT s where they are retro reflected y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 5 of 23 li o 55525 CA Rm Sie D gt m D ve SA ag o Xv x 2 5 eo 1 8 1 8 A LL d d Y H SJosseJduJo2 TA LE g ER pE O 515 VINISd pueAyoyMs v SLS VlNIHd 10 speej dot Il 1d i I 1d A IO jauun Aejag rz 2 3 lt e Figure 1 PRIMA Metrology hardware Overview VLT TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 6 of 23 VLTI Storage Room MET Electronic Cabinets PRIMA Metrology Table and enclosure Light Source Laser Assembly Laser Head Frequency Stabilization Heterodyne Assembly Fiber Coupler Unit y 39 55MHz V 36MHz v 40M Hz optical fibers etric Laboratory Interferor to Midi t amp ble to Amber able Beam Launcher amp Combiner Unit Channel B Beam Launcher amp Combiner Unit Channel A VLTI Optical Train WN Telescope
16. nterlock system based on safety PLC s 14 5 3 Hazard Identification and Risk Estimation 20 6 PRIMET Reliability eet 21 PRIMET preventive maintenance 23 8 Actions after an Earthquake 23 9 VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 3 of 23 1 Scope This documents presents the safety analysis for the PRIMA Laser metrology system PRIMET as well as the imple mentation of the safety equipment required to operate it based on AD 1 and AD 2 It addresses hazards to PRIMET and to personnel during installation commissioning maintenance and operation at Paranal This document also includes an estimation of the reliability of PRIMET based on information provided by the manu facturers of some PRIMET components based on the experience gained during the testing of PRIMET in Garching and on other ESO instruments Preventive maintenance activities and a spare parts are listed 2 Applicable and reference Documents AD 1 Safety conformity assessment procedure SAF INS ESO 00000 3444 issue 1 10 10 2006 AD 2 ESO General Safety regulations Laser safety SAF INS ESO 00000 0011 Issue 1 AD 3 Electronic Design Specifications SPE ESO 10000 0015 issue 6 8 12 2005 AD 4 Design Description of the PRIMA Metrology System VLI TRE ESO 15730 3000 Issue 1 March 03 AD 5 As buil
17. p the required L number from table in EN207 the required minimum L number is L3 see Fig 4 EN207 Classification and Specifications of filters and eye protection against Laser Max spectral Maximum power E and or energy H density in the wavelength range Scale transmittance 180nm to 315nm gt 315nm to 1400nm gt 1400nm to 1000 microns number At Laser D LR M D LR M D LR M __2 10 10 3x10 3xI0 10 5 0 150 0 10 10 13 17 1 10 5 oi 10 10 10 I4 10 1 Lait 10 50 15 Iw 10 10 Figure 4 EN207 classification and specifications of filters and eye protection against Laser Selected Laser Protection goggles The protection goggles purchased for PRIMET are model Protector L 08 and Star L 02K with T96 filters from LaserVision www lvg com These goggles are specified L5 1 e much better than the minimum required L3 The Optical density is gt 6 at 1319 nm The glasses will be available in dedicated boxed at the entrance of all places where operators are potentially in contact with the laser Storage room VLTI laboratory All Coude rooms VLI TRE ESO 15730 4546 89 24 Prima Metrology Safety and 1 11 of 23 Inside each AT Blick durch den Filter auf das 7 trum g S m m Tranemisssonskurve Filbor T96 200 400 600 800 1000 1200 1400 A Fassimg VISICIN ECO PHOTECTOR GOLD LINE VISI
18. perated since mid 2004 ware without failure y VLT TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 23 of 23 Table 5 Component Reliability Lock in amplifier 21600 standard electronics Temperature controller detector power am 21600 standard electronics supply 7 PRIMET preventive maintenance Table 6 PRIMET Preventive maintenance Item manpower Total time Period required required Check Alignment 1 pers 1 2 day every PRIMA run or every 2 months Change clean fiber adaptors and 1 pers 1 2 hour every change of Channel A of fibers PRIMA Run health Check script 1 2 day every PRIMA run or every month 8 Actions after an Earthquake After an earthquake of medium intensity Mercali intensity 4 5 or high intensity Mercali intensity gt 5 the hardware located in the storage room and in the VLTI laboratory shall be inspected This includes in particular e Checking that the cooling pipes of the heat exchangers located on each electronic cabinet are OK e Checking that the safety Interlock system is operational In addition some software scripts dedicated to health checks shall be run
19. rts and active com ponents Excluded are all passive mechanical structures and optics for which no failure are expected during the life time of PRIMET considering the above environmental conditions Table 5 Component Reliability Item MTBF Duty at Spares available Com hours Paranal ments hours ESO LCU crate gt 100000 87600 spares available ESO standard boards used in PRIMET 87600 NENNEN VLI TRE ESO 15730 4546 ES 24 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 22 of 23 Table 5 Component Reliability MEO mas em Em RENE I _ speed digital I O 145 000 87600 1 spare PMC HPDI32A 64K Reflective memory gt 400 000 8 600 or 5565 110000 EM Meter item 1 spare Proto manufactured in 2001 still operating without failure Current Phase meter x2 manufactured in 2005 Only 1 failure reported OR gate replaced Laser head 10 000 21600 10000 hours lifetime of the pump diodes 1 spare Optical fibers and adaptors gt 87600 87600 Spares available Fiber coupler 87600 operated since end of 2002 without failure 1 spare 21600 1 spare Operated since 2004 1 failure observed No failure observed on a similar system since 2001 AOM heads 21600 No Spare cost reason TBC Operated since 2004 No failure observed on a similar system since 2001 Quadcell detector head analog 21600 Custom module 2 spares Laser frequency stabilization Hard O
20. t Phase Meter configuration for the PRIMA Metrology System VLI TRE IMT 15734 3726 issue 1 20 7 2005 AD 6 Design of the Laser Assembly of the PRIMA Metrology System VLT TRE IMT 15731 3154 issue 4 19 12 2003 AD 7 Prima Metrology Control Electronics VLT TRE ESO 15735 2963 issue 2 AD 8 User Manual Mephisto Laser www innolight de AD 9 User Manual Diode pumped Fiber coupled Non planar Ring laser Model 125 1319 200 Lightwave Electronics AD 10 Prima Metrology Test report VLT TRE ESO 15730 4042 RD 1 ESO Garching Laser Safety Instruction SAF PRO ESO 00000 3511 issue 1 2 2 2006 RD 2 Design of the PRIMA Metrology Interlock System VLI TRE ESO 15735 4544 issue 1 April 2008 3 Acronyms MPE Maximum permissible exposure limit MTBF Mean Time Between Failure MTTR Mean time to repair N A Not Applicable PV Peak to Valley TBC To Be Confirmed TBD To Be Defined VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 4 of 23 4 Description of PRIMET The PRIMA Metrology System PRIMET is a component of the PRIMA facility which monitor the internal optical path of the VLTI using an Infrared laser The hardware 1s distributed in the VLTI storage room where the laser beams are generated inside an enclosure and in the VLTI laboratory where the laser beams are superimposed on the stellar paths All the control electronics is located inside the storage room The laser beams are transferred fro
21. t when the laser in ON Interlock on the entrance door The entrance door is the only access the VLTI laboratory and the VLTI tunnel The interlock can be overridden for several seconds using a pin code both inside and outside the lab A buzzer is avail able outside the lab to request opening of the door A push button key allows triggering and locking the interlock VLTI Tunnel Only accessible through the VLTI laboratory which makes the VLTI tunnel a Controlled laser area with key pad access control Coude room UT s Controlled laser area with key pad access control At the entrance door single access Safety goggles available Flashing light when the laser in ON Interlock on the entrance door WA 80 T0 CO The interlock can be overridden for several seconds using a pin code both inside and outside the lab A buzzer is avail able outside the lab to request opening the door A push button key allows triggering and locking the interlock Auxiliary telescope At the entrance door single access Warning labels Safety goggles available Auxiliary telescope pit when no tele Warning labels on the pit cover scope is installed do not remove bi lingual english spanish Nasmyth platform Warning labels Lock out button available in the UT lock out station 9VSPV OCLS1 OSH HELL IA VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 14 of 23 Any personnel with authorized access to the
22. tolerable risk ing shock recorders Integration Laser hazard Safety interlock to be inte Improbable Marginal Hardware damaged by grated first Class IV negligible risk Human error Integration performed by trained people following the ESO amp Paranal safety regula tion Commissioning Laser hazard Safety interlock Improbable Marginal Hardware damaged by Commissioning performed by Class IV negligible risk Human error trained people following the ESO amp Paranal safety regula tion Operation Hardware damaged by No access to the Hardware Improbable Marginal Human error during operation Class IV negligible risk User manual Maintenance laser hazard Safety interlock Improbable Marginal Hardware damaged by Maintenance performed by Class IV negligible risk Human error trained people following the ESO amp Paranal safety regula tion De commission None Not applicable Not applicable ing Disposal VLI TRE ESO 15730 4546 Prima Metrology Safety and 1 Reliability Analysis 02 04 08 21 of 23 6 PRIMET Reliability The reliability goal of PRIMET is similar to any other VLTI instrument i e typically 12 month MTBF and a lifetime of 10 years 87600 hours PRIMET will operate under well controlled laboratory conditions at Paranal Temperature range 15 5 5 C Relative Humidity 5 to 5090 Air cleanliness class 30000 The maximum duty of PRIMET is considered as 12 hours per nights
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