ML17278A549

Rev 0 to Procedure Tp 8.6.6, Special Test Procedure for Tdas Class 1E Isolators.

ML17278A549
Person / Time
Site:	Columbia
Issue date:	09/24/1985
From:	WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
Shared Package
ML17278A548	List: ML17278A547 ML17278A549
References
TP-8.6.6, NUDOCS 8601060086
Download: ML17278A549 (22)

Text

FRQCEQURE REVISION FQRM eORtQiNAL Procedure Nunber: T 8 b Current Revision: 0 Procedure

Title:

6 c.iaI Hei P~ek~l- 4r T C a.zg iE. ZMlcrtarS POC Meeting Nuober:

CHANGE: (See attaclled copy of'arked up procedure.)

JIVE.LE'T E' fafoc.a C vfEE. 8601060086 851220 PDR ADOCK 0>000~97 REASON FOR CHANGE: F PBR.

~+ST C.n~ P~ea Yes No This procedure/revision constitutes a change to procedures as described in the FSPR.

2. x This procedure/revision constitutes 'a change to Technical Specif ications.

This pzoceduze/revision constitutes an unreviewed safety ques-tion as defined in 10CFR50.59. 3ustification for this evalua-tiOn'Aay i'OCC+rg /)CS hC fCV'f CMCd + liay I W 3CPI e Sl/ Iafff r/ i'~ t OCR 4. $

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4. P This procedure/revisi:on constitut s an unreviewed environmental question or a charge--in the Environmental Protection Plan.

(See Tech. Spec. App;-B, EPP 3.0.)

5, p' This procedure/revision nullifies a previous regulatory commitment being qatisfied. (See paragraph =1.2.4.2.A.2.d.}

Stlppir4 in+Os ~~~ S~+ W lVIPC Cj>UCgkr'>M A. 'S~Oaf W4*l

6. This procedure revision constitutes a %el<-8V-S3V QZ. 3~><<c.aQ.oEZ Verafxed y Oate TP 8.6.6 TP 8.6.6-2 of 5

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B. Provide test signals on the recorder to verify the voltage scale.

Label the signals and the voltage ranges on the recorder trace.

g go-F5 Ver fied by Date C. Mount the isolator to be tested in an isolator tray and electrically connect it as shown in Figure 1. Provide a 4 ma signal (1 VOC across Rl) frcm the diff'erential pressure transmitter. Record the serial number of the isolator.

Isolator S.N. 57% g-z.o Q=/o Verif'ied by Date CAUTION: The perf'ormance of the next step will have an unknown eff'ect on the isolator. Care should be taken to insure- no personnel harm free any resultant action.

O. Turn on the visicorder at 40 mn/sec and turn on switch Sl. After approximately 3 seconds, turn switch Sl to the "OFF" position.

g- zw-8a Verii'ied by Date Sign and date the recorder trace and identify aU. signals and the isolator serial rubber. Attach the trace to= this procedure.

'-z;o-FS Yerxfied by , Date Repeat Steps C through E'bove for two more isolators chosen at random. Record their serial numbers below.

g-z.o -F<

so ator S. . er ed by Date G. For all three cases above, determine:

1. The voltage applied to the output.

2. The length of time voltage was appU.ed.

3. The maxifmm voltage resulting on the input.

4. The duration of the voltage resulting on the input.

Surearize the results in Section 8.6.6.7.

f-z, o-7S era red by Date TP 8.6.6 TP 8.6.6-3 of 5

I" H. Compare the results of this test to the acceptance criteria 8.6.6.6 and verify that the isolator f'unctioned properly.

of'ection Gr ~

9-ac -F<

Criteria Dj'.6.6.6 Acce tance A. Electrical The Class 3E signal masured interference is less than 50 mv peak to peak f'r ra more than 10 msec during the application of'he Maximun Credible Fault Voltage and the signal f'unction is not inhibited.

The Class IE, signal maintains its initial'alue af'ter the Haximun Credible Fault Voltage has been removed (within signal tolerance transmitter).

of'he B. P sical Acce tance Criteria The isolator remains intact during and af'ter the application of the Haximun Credible Fault Voltage.

7.6. ~ .7 ~Tt S TP 8.6.6 TP 8.6.6-4 of'

T TP 8.6.6 TEST

SUMMARY

STEP B. The signals recorded and voltage ranges are INITIAL CH DESCR IPT ION VALUE SENSI T I V ITY 1 Isolator Power Supply 24. 01VDC 4. 03VDC/DIV 2 Isolator Input 1. 02VDC . 05VDC/DIV 3 Transmitter Power Supply 24. OOVDC 3. 51VDC/DI V 4 Isolator Output 10. 22VDC 34. OVDC/DIV STEP C. The functionality of the isolator (measuring of the output voltage) was also veri Fi ed in this step.

STEP D. The actual chart speeds for Test Case ¹1 and ¹2 were 40 in/sec and For Test Case ¹3 80 in/sec.

STEP G. From the attached recorder traces:

TEST OUTPUT MAXIMUM CASE¹ VOLTAGE DURAT I ON VOLTAGE DURATION 1 114. 6Vrms >3 Sec. .0. 070VDC(p-p) 250usec.

2 3

114. 6Vrms 114. 6Vrms

>3 Sec.

>3 Sec. '.

..0, 275VDC(p-p) 400VDC(p-p )

250usec.

250usec.

STEP H. The resultant voltage spik'es on the input (Class 1E) side oF the i solator exceeded the acceptance criteria voltages oF Section 8 6. 6. However> the pulse duration was much shorter than the maximum allo~ed. The: control signai was not affected (other than the pulse) and the transmitter con-tinued its function aFter the application of the voltage.

The isolator in < all three cases) performed its intended Function bg not allotting the Maximum Credible Fault voltage to adversity affect the Class 1E Function.

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