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Page Title:
Table 4.23. Partial FMEA for the Cooling Water Chlorination System |
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|  DOE-HDBK-1100-2004
Table 4.23. Partial FMEA for the Cooling Water Chlorination System
DATE:
1/4/93
PAGE:
1
of
1
PLANT:
SYSTEM:
Cooling Water Chlorination System
ITEM:
Pressure Check Valve
REFERENCE:
FAILURE
FAILURE
OPERATIONAL
FAILURE
DETECTION
COMPENSATING
SEVERITY
REMARKS/
MODE
CAUSE(S)
MODE
EFFECTS
METHOD
PROVISIONS
CLASS
ACTIONS
Too much flow
Both internal
Operation
Excessive chlorine flow to
Rotameter
Relief valve on
III
None
through valve
pressure valves
Tower Water Basin - high
Pressure check valve
Daily testing of
fail open
chlorine level in cooling
outlet
cooling water
water - potential for
excessive corrosion in
chemistry
cooling water system
Rotameter
Automatic
IV
None
Too little flow
One or both
Operation
No/low chlorine flow to
through valve
internal pressure
Tower Water Basin - low
temperature
valves fail closed
chlorine level in cooling
Daily testing of
controllers at most
water - potential for
cooling water
heat exchangers
excessive biological
chemistry
growth in cooling water
system - reduction in heat
transfer
Operation
III
Internal relief
Potential low chlorine flow
Distinctive
Pressure check valve
Action Item:
Chlorine flow
odor
to environment
to Tower Water Basin - see
located outdoors -
Consider
valve sticks open
above
unlikely to
venting relief
Both internal
accumulate
valve above
ground level
pressure valves
Chlorine released to
significant
concentration
fail open and
environment - potential
relief valve opens
personnel injury due to
exposure
59
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