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[Sphenix-magnet-l] FW: ESERC Review of sPHENIX cry system
- From: "Yip, Kin" <kinyip AT bnl.gov>
- To: "sphenix-magnet-l AT lists.bnl.gov" <sphenix-magnet-l AT lists.bnl.gov>
- Subject: [Sphenix-magnet-l] FW: ESERC Review of sPHENIX cry system
- Date: Wed, 15 Apr 2020 20:34:42 +0000
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Hello,
This is just for the record.
I just attach in this email the unnecessary ESRC checkoff list which includes the resolutions of two items that the Chair of ESRC originally has had questions about. But they have been satisfactorily resolved and so the checkoff list is not necessary any more. Particularly, when I called Jonathan Reich, I/we realized that turning off ODH logic in the “NO Access” mode mode has been the Access Controls Group’s common practice (so that ODH control wouldn’t turn on fans when nobody is in that location, IR or RHIC tunnel). So, this kind of automatically resolves the ODH/NO-Access question that the ESRC reviewers raised.
Kin
From: Orfin, Paul <porfin AT bnl.gov>
Mike,
That sounds good. So no additional actions are needed at this time. Once complete, we will have a walk through before operation begins.
Thank you, Paul Orfin
From: Sivertz, Michael <sivertz AT bnl.gov>
Paul,
I think all ESRC Check List items have already been closed out, as you indicated in your attachment. I see no reason to post the Check List to the MCR. The sPHENIX Magnet Cryogenic System requires a walk-through before operation. Once the walk-through is completed, it is approved to operate. That can probably be completed along with a more general sPHENIX walk-through at a later date. Does that work for you?
Mike Sivertz
From: "Orfin, Paul" <porfin AT bnl.gov>
Mike,
Attached is the form filled out for the 2 items from the meeting. Let me know if you need anything else to close out the items.
Thank you, Paul Orfin
From: Sivertz, Michael <sivertz AT bnl.gov>
Paul,
I don’t know who all should get this message. Please distribute it to anyone I may have missed. Below are the comments/questions I captured from the meeting. Some items are highlighted that will need to be addressed before operation is approved. There were only 2 items that needed further thought. I have attached a blank ESRC Check List form for you to fill out and return to me for those two items. Let me know if you have any comments or questions. Mike Sivertz
ESRC Meeting 9 April 2020
sPHENIX Magnet Cryogenic System presented by Paul Orfin Presentation available of the indico web site: https://indico.bnl.gov/event/8128/
Attending: Angelika Drees, Brian van Kuik, Carl Schultheiss, Mike Gaffney, John Haggerty, Joe Levesque, Karl Kusche, Kin Yip, Paul Orfin, Peter Hamblen, Roberto Than, Thomas Tallerico, Joe Tuozzolo, Charlie Folz, Bill Christie, Pat Sullivan, Mike Kretchman, Glenn Young, Lenny Campione, Jim Mills, Paul Sampson, Mel Van Essendelft, Achim Franz, Frank Craner, Mike Sivertz (recording).
Paul Orfin made the presentation via BlueJeans of the sPHENIX Magnet Cryogenic System. Questions were recorded in the comments, and answered after the talk.
MikeG: Is the 100 Kelvin hold on the magnet accomplished with lN2 or Helium gas? Paul: 100k hold with helium gas.
Angelika: Is the temperature gradient of 40 K per day? Hour? or what? Paul: This is not a cooldown or heating rate. Rather it is the temperature gradient sustained across the magnet, from the inlet to the solenoid to the outlet temperature immediately before the Phase Separator.
MikeG: How is the 7 g/s flow controlled? Roberto: The heater on the return phase separator will add the remaining load to get the consumption to the desired 6-7 g/s. The basic control will be liquid level and pressure control. Pressure control is critical for the current lead flow. The system has a flowmeter on the supply side, shield and current leads flow meters to calibrate the total flowrate.
Bill: Are the 5 cryo segments bolted or welded? Paul: everything is welded together, except for the jumpers (removable parts) Bill: Is outside segment protected? Paul: It is behind a service building, so protected.
MikeG: FMEA should be reviewed after the system is built? Paul: Technical experts and Lab Technical Safety Review Team (Joe Tuozzolo will control that).
Glenn: What material is valve seat material? Paul: Teflon/Kel-F is often used. There is no alternative. Radiation levels are not very high.
JoeL: Is any equipment a new connection to emergency power? Tom: The cryo controls racks are already on UPS/Emergency power. The large heaters are not on emergency power. If power is lost, the shield returns flow, which will be small, will cooldown the WR header slowly, but we can stop the flow of the shield temporarily and not cause major issues, until power is restored. Will meet up with PK Feng, and make sure everything gets put on emergency power and will not overload. PLEASE LET ME KNOW WHEN PK HAS APPROVED THIS ACTION, OR DECLARED IT UNNECESSARY.
PatS: If you are tying things to emergency generator, and generator is tied to a safety function, then it will need to be tested every month. That can create issues.
JoeL: The egress review around the equipment, who was that done by? Paul: Talked about at prior meetings.
Carl: Is the atmospheric relief on the gas cooled leads vented to the outside? Paul: Yes it is vented outside. The current leads are vented to atmosphere. During normal operation it is in the fenced area and will be engineered to dump to a dirt area away from the cable trays and water lines. During the 100K summer shutdown period, the fenced area and line can be posted to caution on the vent discharge.
Bill: As this is a safety review, it would be good to specify that the cryo venting location is designed or placed such that no personnel can be in close proximity to the outside venting location. Paul: StIll under review. West wall pipe is pointing up and away, labeled properly, inbetween service buildings, high up, so should be no risk to personnel.
JoeL: Will the ODH classification change between normal runs and the summer 100k Maintenance State? Paul: No, unless we don’t run the nitrogen in the summer. We will remain in ODH-0 even during summer shutdown because of N2 usage.
MikeG: Now that the magnet will use helium flow, is there any acostical noise (flow noise) that will affect the detector. Paul: We minimize it whenever possible. The 400L reservoir separate this. Noise generated from boiling is not significantly different in the solenoid cooling channels, since the heat load is the same. The rest of the boil-off is generated in the return phase separator. JohnH: We are planning a vibration analysis, to study motion of inner detector. No safety issues. Paul: Existing phase separator acts as buffer, greatly reduces plant flow fluctuations causing acoustic noise.
Carl: Have you reserved places in the service building for the equipment being moved from the IP? Paul: We have a general location for our racks, but have not speced out the space for our equipment.
MikeG: Helium storage tank heater may want to be on backup power. Paul: Noted.
Carl: If you are providing pressure in the 400L storage using the heater, how long can you maintain the flow? Paul: As long as there is helium in the reservoir. That is how we determined the 400 L spec. Reservoir is sized to allow slow discharge of 45 minutes.
Bill: I realize that the magnet is a solenoid, with the beam along the axis of the field, but it has been seen at STAR that magnet trips can lead to rapid rise of electron clouds in the IR beampipe, which leads to increased backgrounds and radiation in the area. At the higher beam intensities planned for sPHENIX, and the stronger solenoid field, does RHIC need to be tied into the sPHENIX quench system so that the beam gets automatically aborted? Kin: We should probably abort the beam under these conditions. Bill: It is dramatic at STAR which has lower intensity and one third the field. STAR is flooded with radiation whenever the magnet quenches. Glenn: It would be operationally prudent to dump the beam. JohnH: Under consideration. The signal is there for the MCR, this can be implemented by MCR controls. Action item for MCR Controls.
MikeG: At 100K operations, what is the driving force for the cold Helium gas? Paul: 1010B Helium compressor, via the S-header to 1008B/IP8 back to WR header to 1010B compressor suction.
Charlie: Are the heaters SCR or contactor operated? Tom: They are SCR controlled heaters.
MikeG: Recommend that when the system is in an “NO ACCESS” mode, that the fans are taken off of automatic mode. Paul: It is in the ASE that the exhaust fans must be on automatic mode. JoeL: Why not turn off the activation circuit instead of turning off the fans. All the smoke and other safety systems contine to work. Drop the ODH logic in no ACCESS MODE to prevent fan from going on, and keep the fire alarms active. I WOULD LIOKE TO KNOW WHAT THE RESOLUTION OF THIS IS. STAY IN ODH MODE ALL SUMMER AND RISK THE VENT FANS COMING ON NEEDLESSLY, OR FIND A WAY TO SWITCH MODES.
JoeL: With IP8 34,500 cfm fans, are you sure one blow in and the second blow out? The original design was both exhaust for smoke and flammable gas removal. These fans were on the back wall of the IP. Maybe a new vent was installed? Paul: We will redo the study of ODH calculations, hopefully with better results.
PaulS: Hi FYI we have UPS and ATS setups for equipment such that scheduled generator testing can be completed during the run. |
Attachment:
ESRC CHECKOFF LIST_sPHENIX_Cryo_2020_0409.docx
Description: ESRC CHECKOFF LIST_sPHENIX_Cryo_2020_0409.docx
- [Sphenix-magnet-l] FW: ESERC Review of sPHENIX cry system, Yip, Kin, 04/15/2020
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