ML20070B521

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Form NEL-011 Sheets 1 & 2, Semiannual Thermocouple Calibr Procedure
ML20070B521
Person / Time
Site: University of Utah
Issue date: 05/25/1988
From:
UTAH, UNIV. OF, SALT LAKE CITY, UT
To:
Shared Package
ML20070B459 List:
References
NEL-011, NEL-11, NUDOCS 9101310213
Download: ML20070B521 (2)


Text

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FormNE!All Sheet 1

. .* RSC Approval:N25/88 >

SEMI ANNUAL THERMOCOUPLE CAllBRATION PROCEDURE I

Objective: valueToandinsure the 'IRIG the thermocouple A fuel system temperature is operating safety Specification properly Technical limit setting (is mainta 4.2(2)).

4 Prucedure: 1. Disconnect therrnocouple input #3* and attach the I.eeds and Northrup millivolt potentiometer (ME176 or equivalent) with EMF to centertap of the BNC connector and the + EMF to the ground side of the connector.

2. Input 0.80 mV and record the "as found" temperature and zero setting below.

n Indicated Temperature (as found): 'C Zero set @

Input 20.65 mV and record the "as found" temperature and gain setting below.

. Indicated Temperature (as found): 'C Gain set @

p 3. Input 0.80 mV and adjust the zero so that the meter reads 20*C.

Zero set to input 20.65 mV and adjust the gain so that the meter reads 500*C, Zero set to o

4. Repeat ateps 2 and 3 until readings are maintained.

O.80 mV Inout 20.65 mV Inout Te moerature 2cro Setting Temnerature Gain Setting .

1.

2.

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5. Input the following voltages and record the meter readings.

Expected Indicated Temperatures Millivolts Temnerature TC#1 TC#2 TC#3 0.80 2(fC n/a n/a 4.10 8.13 100 200 3 n/a n/a n/a 12.21 300 -n/a n/a 16.40 20.65 400 500 3

,_pla n/a-n/a _

7. Check the scram point by setting the meter limit indicator and slowly ' increasing

' the potentiometer voltage until a scram is achieved.

Scram at: mV IndicatedTemperatuit: 'C l

8.' Recalibrate scram set point if necessary. (Scram @ 200*C.)

Scram at: mV IndicatedTemperature: 'C ,

9. _ Disconnect the potentiometer and reconnect the thermocouple inputs.
10. Measure the temperature of the tank water: 'C (use a non mercury thermometer)
11. Fuel temperature indications:

'It #1: 'C TC #2: 'C TC #3: 'C L (Fuel temperature and tank water temperature should agree within 5'C or ground loop problems may exist.)

9101310213 880831

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e FormNE!All Sheet 2 t-

.- ILSC Approval: .V25/88 -

i.  ;
12. Core Configuration Number:

Instrumented Fuel Element Location:

13.Date calibration completed:

14. Senior Operator signature:
  • Throw meter short switch before disconnecting, connecting test leads, or changing thermocouple select switch.

Form api mved by Reactor Safety Committee:

Reacto Administrator: . , [ /4T#((. Date: May 25.1988 f '

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