[Pansophy] SNSPPU FW: Cold Mass Assembly Traveler

[Megan McDonald]

Sorry, thought I was getting these through Pansophy

From: Gary Cheng <cheng at jlab.org>
Sent: Wednesday, March 10, 2021 9:13 AM
To: Daniel Gautier <gautier at jlab.org>
Cc: Naeem Huque <huque at jlab.org>; Megan McDonald <megan at jlab.org>; James Henry <jhenry at jlab.org>; Mark Wiseman <wiseman at jlab.org>; John Fischer <fischer at jlab.org>; Ed Daly <edaly at jlab.org>
Subject: Re: Cold Mass Assembly Traveler

Thanks Dan! I will upload the traveler for approvals.
Gary
On 3/9/2021 10:35 AM, Daniel Gautier wrote:
Hi Gary,

Upon review of the revisions to the traveler, I believe the new content, along with the fact that the new content is bold typeface, will sufficiently direct the technician(s) in a manner that reduces the identified risks.

Nice work.

Dan


Daniel Gautier | Performance Assurance Office | Thomas Jefferson National Accelerator Facility
Desk: 757.269.7586<callto:757.269.7586> | Mobile: 904.635.8155<callto:904.635.8155> | Email: gautier at jlab.org<mailto:gautier at jlab.org>







________________________________
From: Gary Cheng <cheng at jlab.org><mailto:cheng at jlab.org>
Sent: Monday, March 8, 2021 4:25 PM
To: Daniel Gautier <gautier at jlab.org><mailto:gautier at jlab.org>
Cc: Naeem Huque <huque at jlab.org><mailto:huque at jlab.org>; Megan McDonald <megan at jlab.org><mailto:megan at jlab.org>; James Henry <jhenry at jlab.org><mailto:jhenry at jlab.org>; Mark Wiseman <wiseman at jlab.org><mailto:wiseman at jlab.org>; John Fischer <fischer at jlab.org><mailto:fischer at jlab.org>; Ed Daly <edaly at jlab.org><mailto:edaly at jlab.org>
Subject: Re: Cold Mass Assembly Traveler

Hi Dan,

In response to the conclusions from CMASS ASSY PFMEA, John added language to the steps 18, 21 and 24 of the attached traveler. Could you please review the traveler and let John and I know if the added words help to mitigate the risks?

Thanks,
Gary
On 3/1/2021 4:34 PM, Daniel Gautier wrote:
Hi Gary,

While there were no process failures with calculated RPN's that met the risk mitigation threshold of 100, the below were thought to be potentially "low hanging fruit", with easy-to-implement improvements (which is why the team chose to document Recommended Actions).


Process Function
Potential Failure Mode
Potential Effect(s) of Failure
S
Classification
Potential Cause(s)/ Mechanism(s) of Failure
O
Criticality
Current
Process
Controls
D
RPN
Recommended Action(s)
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
(k)
(l)
Install Mu shields
Shield becomes plastically deformed or damaged (physical)
Compromised shielding factor leading to higher cryogenic heat load
3

Mishandling of the shields (sheet metal structures)
3
9
Training
5
45
Add a more formal visual inspection
Install/weld coupler bellows
Bellows are damaged
Leak in insulating vacuum, potential freeze-up of tuners
4

Mishandling, welding error
3
12
Training, leak check
3
36
Verify that the traveler directs the installation of bellows protectors post leak check
Install field probe cables
Not properly tightening the end connector
Poor to degraded signal impacts ability of the cavity to operate
7

Technician error
5
35
Training, calibrated torque wrench, down-stream TDR measurement
2
70
Employ the use of a torque verification spreadsheet (like LCLS-II)


Regards,
Dan


Daniel Gautier | Performance Assurance Office | Thomas Jefferson National Accelerator Facility
Desk: 757.269.7586<callto:757.269.7586> | Mobile: 904.635.8155<callto:904.635.8155> | Email: gautier at jlab.org<mailto:gautier at jlab.org>






________________________________
From: Gary Cheng <cheng at jlab.org><mailto:cheng at jlab.org>
Sent: Monday, March 1, 2021 4:21 PM
To: Daniel Gautier <gautier at jlab.org><mailto:gautier at jlab.org>
Cc: Naeem Huque <huque at jlab.org><mailto:huque at jlab.org>; Megan McDonald <megan at jlab.org><mailto:megan at jlab.org>; James Henry <jhenry at jlab.org><mailto:jhenry at jlab.org>; Mark Wiseman <wiseman at jlab.org><mailto:wiseman at jlab.org>; John Fischer <fischer at jlab.org><mailto:fischer at jlab.org>; Ed Daly <edaly at jlab.org><mailto:edaly at jlab.org>
Subject: Re: Cold Mass Assembly Traveler

Hi Dan,

Could you remind me if PFMEA of cold mass assembly suggests any extra safety or quality measures to be taken? If not, I will submit the traveler for approvals.

Thanks,
Gary
On 3/1/2021 3:08 PM, Ed Daly wrote:
Hi John,
The string will likely start next week.  Roll out might happen before the end of March.  I would like the CM assy traveler to be approved and live by then.  In addition, any known drawing updates for the cold mass should be folded into the drawing package.

We'll discuss at the end of the PPU mtg this week.
Cheers,


Ed

--------------------

Edward Daly

757-269-7721 (work)

757-969-0783 (mobile)



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