F. M. E. A. RHIC Cryogenics Page: 4 of 229
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3.2.2 Meet with cognizant personnel, to discuss potential failure modes of equipment and
systems. Compile this information (see appendix).
3.2.3 Review or establish operating procedures so that mode dependency can be established.
3.2.4 Study and list each component, in the analysis work sheets, and enter all required
information. See appendix.
3.3 DETAILED PROCEDURE FOR ANALYSIS
3.3.1 As the analysis of systems differ, in that some are operational mode dependant, the
detailed method is contained as a cover sheet with the analysis work sheets.
To apply an FMEA, to the valve boxes and magnet strings, a detailed study of the valve box
P&ID's and the development of detailed operating procedures was completed. The operating
procedures covered the various modes of operation, A to G, below. The development of the
procedures was the first exercise verifying the capability of the valve box P&ID's. Some
modifications, noted below, were made before the actual FMEA. The modes studied for the
analysis of the valve box and magnet strings are as follows:
A) Normal full-ring operation.
B) Warm-up of the sextant at 5:00 including: isolation, reestablishment of heat shield
flow to other sextants, liquid and gas recovery via CR line, reestablishment of helium coolant to
other sextants ( circulator off, refrigerator supply to magnet loop to recooler JT valves to return),
circulation of warm helium from compressor discharge.
Note: Isolation of lead flow problem
C) Warm-up of the 3:00 sextant which, schematically, is the same as 9:00
D) Warm-up of the 9:00 sextant including: isolation, reestablishment of heat shield flow
to other sextants except 7:00, liquid and gas recovery via CR line, reestablishment of helium
coolant to other sextants except 7:00 ( circulator off, refrigerator supply to magnet loop to
recooler JT valves to return); 7:00 sextant, magnet and heat shield, will be vented periodically
via H4806A and H4810A1H4811A.
Note: warm helium for final warmup step is circulated through the cold sextant at 7:00, with
subsequent increase in conductive heat load to the 7:00 cold mass. An alternate scheme is a
remote helium circulation pump. This would require warm tap points at individual valve
Note: Modification of P&ID ......86 (6:00 valve box) as follows: move the tap from
H4639A to zone E6 or E7. See page 15 of notes.
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S., Kane. F. M. E. A. RHIC Cryogenics, report, February 8, 1999; United States. (https://digital.library.unt.edu/ark:/67531/metadc865608/m1/4/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.