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Message ID: 1591     Entry time: Wednesday, August 02, 2017, 15:13
Author: David Wang 
Category: South Hot-Cell 
Type: Standard Operation 
Module: TM2 
Target/Number:  
Subject: SHC, TM2 leak check on HS line. 

HS line is leak checked at SHC this afternoon by helium spay.  Leak detector base LR 0.0 XE-9atm.cc/sec. Base pressure 0.0Xe-4 torr. No leak has been found. This line will be helium pressured  at TCS. It had  a 1.7XE-7 atm.cc/sec leak rate on 70 psi helium at TCS  during last two target  checks.

 2017-08-03. Helium pressure test on TM2 HS line at TCS is done. 70psi helium, 3 minutes. base leak rate 0.0xE-7 atm.cc/sec. Result: 1.8XE-7atm.cc/sec leak which is almost same as before. This line has a very small leak on water block seal under helium pressure test  which we knew already. 

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