ML20086U137
| ML20086U137 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/01/1995 |
| From: | Briney M GEORGIA POWER CO. |
| To: | |
| References | |
| OLA-3-A-076, OLA-3-A-76, NUDOCS 9508030283 | |
| Download: ML20086U137 (1) | |
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^$ d The following is the infonnation the IIT has requested on the first two Calcon temperature switches we wish to test:
1 TSH-19111 ~ D/G 1A Jacket Water Main Header Outlet Temp Hi HISTORY:
The original calibration test was perfonned satisfactorily l
on 3/2/90.
As Found data was 206.2*F to trip.
As Left data was 199.1'F. On 3/30 it was calibrated again (as well as 19110 and 19112).
l As Found data was 198.56*F to trip.
During subsequent logic testing i
it was found to be tripped.
It was " popped" by pinching off the air line, allowing the switch to depressurfre. and then quickly i
repressurizing the switch.
Since that time, subsequent engine testing I
showed it operating correctly.
However. it was removed on 3/31/90 and replaced with a new switch.
Since its removal it has remained i
in storage and has not been tested.
1 TSH-19112 D/G 1A Jacket Water Main Header Outlet Temp Hi HISTORY:
The original calibration test was performed satisfactorily on 3/1/90.
As Found data was 210.4*F.
As Left data was 203.I'F.
O oa 3/3o/9a it
> c=156ratad 9 ia-
^= ra ad data=== iss r r ta trip.
It was noted at that time that a small amount of leakage was l
present even with temperature >20 'F below setpoint.
This d' d not appear to affect the calibration.
The Cooper vendor verified this would not cause a problem with the D/G control system and the switch l
was put back on the 1A< D/G.
Subsequent logic testing showed this i
switch to be leaking still.
It was removed and replaced with a new switch on 3/31/90.
Since its removal, it has' remained in storage and has not been tested.
j Calcon's proposed test for both switches: With both switches at ambient temperature (out of the temperature bath), pressure test with 60 psig air supplied through a 0.028" orifice.
If one or both units leak at room temperature, we will take j
the top section of the switch apart to access the valve area. We will then inspect the valve and
- seat, clean as
- required, reassemble, and check the trip t
setting / response of the switches and adjust as necessary.
If no leaks are found at room temperature, we will heat up the sensor as we do during a nonnal calibration test in the bath to check its trip setting and overall i
response.
If the switches do not respond correctly, we will disassemble and inspect the switch to attempt to identify the root cause of the malfunction.
M MSB/jbc O
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H. M. Handfinger 92 PROJECT 9508030283 950601 '
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