Reliability

1
Reliability Maintenance
Paul C. Czarapata
2
Maintenance Time

• The following chart represents the amount of time
  spent on maintenance during a 168 hour week. IT
  DOES NOT REPRESENT TOTAL DOWNTIME. Some periods
  overlap each other where the chart treats them
  linearly. It also does not represent
  availability for the same reason.

3
(No Transcript)
4
Status Update

• Items Presented to DOE review
• Voltage to Frequency Converters
• Part of Quench Protection System in Tevatron
• Plan called for replacement of Low Beta House
  Systems
• All cards replaced, All crates replaced, All
  sense resistors modified.
• Plan expanded to include all VFCs in Tevatron

5
Status cont. 2

• Overhaul Cryogenics Wet Engines
• All overhauls are complete and should take us
  comfortably into the summer shutdown.
• Cold Compressor Bearings
• We have located an alternate source.
• We have enough on hand but additional units are
  going to be ordered this FY.

6
Status cont. 3

• Compressor Starters
• Plan is to replace 2/3 this Fiscal Year 1/3 next
  year
• First 1/3 are complete.
• Second 1/3 will be done in Summer shutdown
• Remainder will be ordered after October.

7
Status cont. 4

• Other items are in process and showing good
  progress. We have handled the majority of the
  critical items.

8
Current Mysteries

• Ground Motion
• Traced to Domestic water well 1
• Magnet Motion
• Traced to bad Tevatron magnet stands
• Kicker Pre-fires
• Company says you have the best pre-fire rate of
  anyone using this configuration

9
Motion in MI-8 line
10
Newest Dilema

• Magnet Stands are rusting away.
• Evidence of motion with Humidity (rust jacking)
• Evidence of motion with high current in magnets
• (weebolls wobble but they dont fall down!)
• Ed. Note weebolls were round bottom toys for
  small kids.

11
Tev Dipole Roll vs. I
12
Magnet motion vs. Quench and humidity
13
Magnet Stand in A16
14
Replacement of Stands

• During the January shutdown we successfully
  replaced the A16-3 stand while the magnet was at
  nitrogen temperatures. The total number of
  stands needing replacement is now being cataloged
  for replacement when time is available.
• We have placed additional tilt monitors in the
  Tevatron

15
And still more!

• Linac Power Tubes
• Use 7 per year
• This was based on 10,000 hr lifetime (typical)
• Have had two failures after 2,000 hrs.
• Compete with other labs for tubes
• Military no longer uses this tube so volume is
  down for vendor.
• Thoriated cathodes were changed from 2 to 1.5
  due to OSHA difficulties.

16
Linac Tubes cont.

• Coming out of the January shutdown we had a tube
  that was believed to be only marginally useful
  (25).
• Two tubes due in February. Vendor says we will
  get 1 per month between now and August. We
  currently have Argonnes spare installed.

17
Vulnerabilities

• A list of items (vulnerabilities) was generated
  August of 02.
• These items would keep the lab down for at least
  3 months should they fail.
• The list was prioritized by likelihood and
  forwarded to DOE by Steve Holmes.
• The list represented 28.7M just in equipment.

18
Summary

• We continue to battle an aging infrastructure for
  the machine components.
• We will need high reliability and availability to
  meet the laboratories aggressive running
  schedule.
• We will need increased funding to stay ahead of
  the problems.