ML20099L312

Applicant Exhibit A-182,consisting of 900411 Telecopy to a Chaffee Re DG Instrument Test Outline

ML20099L312
Person / Time
Site:	Vogtle
Issue date:	09/07/1995
From:	Burr K GEORGIA POWER CO.
To:
References
OLA-3-A-182, NUDOCS 9512210141
Download: ML20099L312 (7)

Text

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SONOPCO-V0GTLE - 4TE PLOOK 8

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Telecepter:

(205)-877-7885 E '?

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8 ~t [ {Ej Z E A gg DATE:

Acril 11. 1990 i

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RECIPIENT:

Please notify us if you have problems receiving this telecopy.

i FROM:

To NAgg: Kenneth S. Burr NAME: Al Chaffee i

EITENSION: (205) 877-7836 EITINSION:__

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LOCATION: Birmingham, AL LOCATION:

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TELECOPIER #:

I301) 492-8187 4

Verify:

(301) 492-8802 i

SENDER: Should this document be returned to you afts.* it has been sent!

.1.YES

_ NO 1

COMMENTS:

D1 ease review and ernvide coments to Lewis Ward (205) 877-7802 or i

i Ken Burr (205) 877-7836.

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Da IMITM MENT TEST DUTLINE l

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i Phase 1.

Jacket Water Temnerature Switch Reliability Evaluation l

l A.

Perform a reliability evaluation of two new temperature switches (Calcon Model A3500),

used for Jacket Water High Temperature j

switches on the Vogtle Electric Generating Plant (VEGP) emergency diesel generators. The purpose of the evaluation is to determine switch setpoint repeatability due to several factors which are l

outlined in the following test sequences. Additional

tests, i

based on results of these tests, may be added by approval of the GPC test monitor.

l B.

Test Sequence:

i 1.

Record serial and model numbers, and other pertinent data from the instruments, prior to performing any disassembly or removing the sensor from its thernowell.

2.

Remove the sensor from the thermowell and ' determine the i

as-found condition of the spacer-tube (how loose, whether or F

not lock-tite on threads, etc.).

If the spacer-tube was not j

tight, mark the as-received position, then tighten the tube.

3.

Connect air supply and test instrumentation to the switch to l

simulate installed configuration (approximately 60 psig i

clean, dry air through 1/4 in, tubing and 0.028 in orifice).

i Connect test instrumentation to provide continuous recording l

of air pressure at sensor after the orifice, bath temperature (2 channels -- one in a well, and one in the bath) and time.

4 i

4.

Perform a calibration of the' switch in its thermowell using j

the attached calibration procedure. Set the switch 9 200 i 20F.

This calibration is to remain in effect for the subsequent tests.

5.

Perform setpoint tests to measure setpoint and reset sensitivity to the following parameters.

The attached test i

procedure should be used to determine the trip and reset points.

a.

With the sensor installed in the thernovell, check the i

trip and reset point under the following conditions:

(60 i

psig air supply, slow rate of temperature change (e.g.

3 10F/ minute)).

Remove the sensor from the thermowell and 4

insert it directly in the bath, and repeat the trip and reset test. Repeat the above cycle 2 additional times to check for changes in trip and reset points.

b.

With the sensor installed in its thermowell under varying rates of temperature change (approximately 2,4, 6, 10, 15

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and 200F/ minute, with 60 psig air supply pressure).

i c.

With the sensor installed in its thernowell, with a slow

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rate of temperature change (- l'F/ min.), with various air i

i supply pressures (55 and 65 psig).

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d.

With the sensor installed in its thernowell, with slow 1

rate of temperature change (-

18F/ min.),60 psig air 1

pressure, determine the effect of vibration vs.

static conditions on the setpoint.

e.

With the sensor installed in its thermowell, with a slow rate of temperature change (-

18F/ min.),60 psig air l

pressure, determine the effect of a change in ambient air j

temperature of approximately 200F on the setpoint.

I 2

f.

With the sensor installed in its thermowell and the bath l

temperature near, but just below the switch setpoint, i

determine the switch response to a rapid reduction in temperature (approximately 100F in 1 minute).

I g.

Determine the effect of tightness of the setscrew used to attach the sensor in the thernowell on trip / reset point.

I 6.

Determine the effect of spacer-tube looseness by returning the tube to the position noted in step B.2.

If the tube is not loose, then loosen it until it can be easily moved by light finger pressure.

Install the switch in its thermowell i

and recalibrate it using the attached procedure. Check the trip and reset points (at 10F/ minute, 60 psig air) with the sensor inserted in the thermowell and with the sensor inserted directly in the bath, as performed in B.S.a above.

Perform each test a minimum of 3 times.

Phase II.

Testing will consist of analysis work on 7 temperature switches to determine the cause of failure. The test method will be j

determined after the Phase I work is complete.

CALCON REPRESENTATIVE California Control Company (CALCON) j Cary Harelitt l

1334 Callens Road i

Ventura, CA 93003 l

(805)650-1597 i

Mr. Gary Hazelitt was on site (VEGP) and did some initial testing and instructed site personnel on proper calibration methods.

He is a good i

source for information on these switches.

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i ATTACHNDIT 1 TEST PROCEDURE FOR SETTING HIGH TEMPERATURE l

JACKET WATER TRIP SWITCHES (CALCON - P/N F-573-330) l 1

l 1.

Install temperature sensor in bath (See Temp. Bath requirements).

4 2.

Hook-up Air Supply (60 psig thru.028 orifice and test gauge) to sensor "IN" port.

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3.

Heat-up Bath to temperature at which sensors are to be set and i

stabilize.

t 4.

Set temperature switch to trip by slowly turning split ring clockwise 3

while watching pressure gauge.

While adjusting or checking trip i

temperature setting, lightly tap continuously on the side of the sensor.

This simulates engine vibration and will give a more accurate setting.

When switch begins to trip, the pressure gauge will drip.

4 The temperature sensor is considered tripped when gauge drops to 20 psi.

5.

Cool temp. bath and note that temp. sensor resets (40 psi on gauge) by 100F below setpoint.

Pressure gauge must reset to within 1 psi of j

supply pressure by 200F below setpoint.

6.

Reheat bath (always starting 200F belowsetpoint) and check trip i

setting.

Readjust as required to desired setting.

A 20F tolerance is acceptable.

7.

Recheck settings until setting within tolerance is achieved two consecutive times.

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ATTACHMENT 1, PAGE 2 i

TEMPERATURE... BATH AEDUIREMENTS 1.

To test temperature switches accurately, a bath must have heating, j

cooling and circulating abilities.

I 2.

Two Temp. switche thernowells are required submerged 3" into the water.

3.

Install Temp. Sensor in one well and a thermometer in the other.

(Seal t

i thermometer in well at the top to suppress heat loss.

Thermometer should not touch sides or bottom of well).

i 4

A 60 psi supply pressure thru a 0.028

.001 orifice thru a test gauge to the sensor is required.

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PART NUMBER (S)

DN EUMATI C F-5 73-330 SECTION A

RANGE 0 -400 4 DESCRIPTION

• This line of tempeenture seneers s

is desiped eroend Colcon's unign solid phese thwmol uponsion cells.

Medel variations consist of rising temperature trip (N.C.), folling temperature trip (N.O.)

and extendeel element units. Optional cedmium plated j

g carbon steel er steinless steel wells are effered in the

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T stonderd length units. Minimum well thickness is 0.053".

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Extended element sensors have 30d steinless seul l

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wells with 0.119" well thickness.

Being small in j

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diometer, the sensing element stock permits installotion l

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in small diometer wells. The stroke vs. tempmotore t

retie is lineer over the full 0 -400*F temperature range e

and the element is sized to give en ocevrete 100*F setting change for each full turn of the ediusting device.

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This type of esponsion element hos more inherent J

occurocy ond lineerity then the bl. metal disk type, and it connot suffer rupture end less of fluid such as moy 1

occur in the filled bellows elements. Actuel element i

hysteresis is opproximately 2 to 3* F, although service I

ond instellation factors such as wells, boot transfer fluids, rote of temperature chenge, etc. will impose i

other time and temperature gradients. The trip point moy be offected by supply air pressere chonges (approx. 0.3*F /A psi). Units must be installed in a thermo.well and if the unit is positioned within 45' of vertical, Dow 710 heat transfer fluid may be used. This material has o gel time of oppros.

j imotely 18 months et 400'F and oppreciably longer et lower temperatures. This material must not be l

allowed to harden in the well and other hoot transfer grooses should not be used.

AP PLICATION

• These temperature sensors l

may be used os a detector in any medio system compatible with the temperature range of the sensor i

ond the motorial and pressure limitotions of the l

wells.

Extended element sonnes are useful in leenm.

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reaching the center region of pipe fluid flows.

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Typical uses are on engines, gas compressors, and in the process industry as high and low limit trons-I

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ducers. Data is ovelloble relating to pressure and

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amm s mas us 1.n Assu s velocity rotings. Special wells for very high pres.

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sure service con be supplied.

ORDERING INFORMATION* Use the table

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on the right and the outline detoils on the back of suu Va a.co

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j will be shipped factory set and tested at 300 F l

(stotic temperature conditions) with on opplied 3

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y, 35 psi supply oir. Upon request, special temp-g eroture settings will be made et no odditional cost.

1 A smell viel of Dow 710 host transfer fluid is sup-olied with eeCh sensor.

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