ML20086U137

Applicant Exhibit A-76,consisting of 900403 Memo Re Calcon Temp Switches

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)

Text

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• N M dW *dI4D We i DATE: April 3, 1990 UShRC gg -Wyg7 Q_ RE:

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Calcon Temperatg Sgtgsg f FRON: M. S. Briney y DATE 6[/W T0: G. Bockhold, h0CKETING & WCE **S8 A#d BRANC W " ^$ 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 xc: H. M. Handfinger 92 PROJECT

'~' 9508030283 950601 '

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