[Pansophy] Fw: Rework Done: NCR:530 on SNSPPU-CLNRM-CST-LEAK-R1--7

[Naeem Huque]

Hello,

Could you please re-open this NCR

Thanks,
Naeem
________________________________
From: FOREHAND at JLAB.ORG <FOREHAND at JLAB.ORG>
Sent: Monday, June 13, 2022 8:22 AM
To: Danny Forehand <forehand at jlab.org>
Cc: Ed Daly <edaly at jlab.org>; Naeem Huque <huque at jlab.org>; Danny Forehand <forehand at jlab.org>; Juan Jordan <jjordan at jlab.org>
Subject: Rework Done: NCR:530 on SNSPPU-CLNRM-CST-LEAK-R1--7


An Staff/Technician has reworked Non-Conformance Report - sequence number 530 for traveler SNSPPU-CLNRM-CST-LEAK-R1--7.

PAGE 3: MODIFICATION/RE-MEASURE
Rework Staff:   JJORDAN
JJORDAN
FOREHAND


Rework Date:    15-May-2022
17-May-2022
20-May-2022


Rework Comment:         15May2022 Bagged bellow joints between cav 2 and 3 separately to purge with nitrogen and identify leak. Cav 2 downstream leak sized at 4.96e-06 Torr L/s Cav 3 upstream no leak detected. Started bagging Cav 1 and 2 section. 16May2022 Finished bagging between Cav 1 and 2. Purging bellows with nitrogen while spraying one FPC at a time with He. Cav 1 FPC no leak detected. Cav 2 FPC Leak sized at 1.28e-07 Torr L/s. After allowing scan to recover started with Cav 1 downstream bellows no leak detected. Cav 2 upstream bellows leak sized at 3.98e-09 Torr L/s. Increased torque for all 3 flanges to 35 ft lbs. Cav 2 downstream bellows now at 1.06e-06 Torr L/s. Cav 2 upstream bellows now at 2.67e-09 Torr L/s. Cav 2 FPC no leak visible.
17May2022 Increased torque on Cav 2 upstream and downstream to 40 ft lbs. Cav 2 downstream bellows now at 4.41e-07 Torr L/s. Cav 2 upstream bellows now at 3.4e-09 Torr L/s. Increased torque on Cav 2 upstream and downstream to 45 ft lbs. Cav 2 downstream bellows now at 3.6e-07 Torr L/s. Cav 2 upstream bellows now at 4.12e-09 Torr L/s String isolated to swap over to slow bleed up line. Slow bleed up started at 2:06pm.
18May2022 Gasket changed on Cav 2 upstream 19May2022 Bellows changed between Cav 2-3. Slow pump down started. 20May2022 Leak in bag 3 sized at 1.72e-08 Torr L/s. Leak in bag 4 sized at 3.49e-09 Torr L/s. Bagged Cav 2-3 bellows individually as well as Cav 2 upstream and FPC. Started narrowing leaks down after lunch. Cav3 upstream no leak visible after 5 mins of helium spray. Cav2 downstream leak sized at 1.35e-08 Torr L/s. Cav2 upstream leak sized at 3.05e-09 Torr L/s. Cav 2 FPC leak sized at 3.27e-11 Torr L/s. Increased torque on Cav2 upstream and downstream to 50ft lbs. Cav2 downstream no leak detected. Cav2 upstream no change.


Verify Staff:   FOREHAND
FOREHAND
JJORDAN


Verify Date:    15-May-2022
17-May-2022
20-May-2022


Verify Comment:





ENGINEER RESPONSE
Response Engr:




Response Date:




Disposition:    Hold/Modify
Disposition Comment:




PAGE 2: FIRST DISPOSITION
Response Engr:  FOREHAND
Response Date:  08-Jun-2022
Disposition:    Hold/Modify
Disposition Comment:    Try to improve leaks to an acceptable rate before turning over string to CMA.

PAGE 1: INITIATE AND DESCRIBE
SN:     PPU-06
SNtype:         CSTSN
DRAWING NUM:    104211500-M8U-8200-A001
PART DESCRIPTION:       CRYO STRING ASSEMBLY
TRAV_ID:        SNSPPU-CLNRM-CST-LEAK
TRAV_REV:       R1
TRAV_SEQ_NUM:   7
DESCRIBE STAFF:         FOREHAND
DESCRIBE DATE:  2022-06-08 15:18:00.0
DESCRIBE COMMENT:       The total leak rate of the string is higher than the specified 3E-10 Torr l/s. The first leak is approx. 3.3E-6 Torr l/s. The second is approx. 6.5E-8 Torr l/s.
NOTIFICATION COMMENT:

The NCR is at the following URL: 530<https://pansophy.jlab.org/pansophy/Travelers/TRAVELER_FORM.cfm?project=SNSPPU&area=SNSPPU&system=CLNRM&TRAV_ID=SNSPPU-NCR&TRAV_REVISION=R12&page=3&maxpage=4&TRAV_SEQ_NUM=530&travstat=&serialnum=PPU-06&SN=PPU-06&SNTYPE=CSTSN>
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