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Page Title:
Table 4.22. Partial FMEA for the Dock 8 HF Supply System |
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|  DOE-HDBK-1100-2004
Table 4.22. Partial FMEA for the Dock 8 HF Supply System
DATE:
12/30/92
PAGE:
1
of
1
PLANT:
Y-12 Plant
SYSTEM:
Dock 8 HF Supply System
ITEM:
Pressure Reducing Valve V-13
REFERENCE:
FAILURE
FAILURE
OPERATIONAL
FAILURE
REMARKS/
COMPENSATING
SEVERITY
DETECTION
CAUSE(S)
MODE
MODE
EFFECTS
METHOD
PROVISIONS
CLASS
ACTIONS
II
If N2 line relief
PRV-3 at V-13
Valve open
Internal
Operation
High N2 pressure at HF
Local pressure
outlet.
indication on
too far
valve
cylinders, HF
valves lift,
N2 line.
malfunction.
vaporizer - HF
vaporizer relief
PRVs on N2 feed
Operator
vaporizer vessel
valve should not
lines to HF
Local pressure
error.
rupture - HF released
lift.
cylinders.
indication
to environment.
between rupture
error.
Relief valve
disk and PRV-4 PRV-4 at HF
High HF flow to HF
discharges piped
vaporizer.
at vaporizer.
vaporizer - high HF
to D-wing stack.
flow to B-1 wing -
potential liquid HF to
B-1 wing.
No N2 pressure to HF
Local pressure
Valve closed
Internal
Operation
None
IV
cylinder - no HF flow
indication on
too far
valve
to HF vaporizer, B-1
N2 line.
malfunction.
wing.
Operator
error.
error.
Operation
None
IV
External
Valve seal
Waste on N2.
Audible
leakage
leakage.
If severe, same as
Local pressure
"valve closed too far."
indication on
N2 line, if
severe.
58
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