ML20195B737
| ML20195B737 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/25/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8811020181 | |
| Download: ML20195B737 (6) | |
Text
. _ _
e TENNECOEE VALLEY AUTHORITY CHATTANOOoA. TENNESSEE 374ol
$N 1578 Lookout Place 00T 251988 i
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U.S. Nuclear Regulatory Commission i
ATTN Document Control Desk Washington, D.C.
20555 t
Gentlement In the Matter of
)
Docket Nos. 50-327
[
Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - 10 CFR 50.62 ADDITIONAL DESIGN INFORMATION
(
References:
1.
TVA's letter to NRC dated August 23, 1988 "Sequoyah Nuclear Plant (SQN) - 10 CFR 50.62 Design Changes"
(
2.
Letter from C. E. Rossi, NRC, to L. D. Butterfield, A W S
[
Subconsnittee, dated July 7,1986, "Acceptance for Referencing of Licensing Topical Report"
[
[
This letter provides additional information regarding SQN's anticipated
[
transient without scram mitigation system actuation circuits (AMSAC) design.
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WA conssitted in reference 1 to identify the specific methods used in the AMSAC design for providing isolation between the class 1E and non-class-1E interfaces.
In addition, WA agreed to provide NRC with informa. tion regarding the required method for qualifying these isolators as provided in appendix A of reference 2. provides a block diagram of the SQN AMSAC design. This diagram provides a simplified breakdown of the class 1E to non-class-1E interfaces.
As indicated by this diagram, TVA's design consists of interposing relays that act as isolation devices between the safety-related and non-safety-related l
eircuits.
t i addresses each of the requirements for the isolation devices as
[
set forth in appendix A of reference 2.
This information is supplemented by I
the test report data on the Westinghouse Electric Corporation (W) type AR440 relays. This information is contained in enclosure 3 and confirms that these relays are acceptable for use as isolation devices.
In conclusion, the SQN AMSAC design, when implemented, will conform to the f
I requirements of 10 CFR 50.62.
In addition, WA has determined the isolation method and devices that will be used to adhere to the requirements of appendix A of reference 2.
I 8911020181 881025 hDR ADOCK 05000327 i
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. U.S. Nuclear Regulatory Commission OCfT 251988 l
Please direct questions concerning this issue to B. A. Kimsey at (615) 870-6847.
Very truly yours, TENNESSEE VALLEY AUTHORITY h
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R.Cridley,Madager Nuclear Licensing and Regulatory Affairs Enclosures cc (Enclosures):
s Ms. S. C. Black Assistant Director for Projects l
TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. F. R. McCoy, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Ii:ou Ferry Road Soddy Daisy Tennessee 37379 1
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i ENCLOSURE 2 t
i In order to verify that the existing SQN anticipated transient without scram mitication system actuation circuits (AMSAC) design isolation devices
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conformed to the requirements for isolation devices as provided in appendix A of reference 2. TVA researched its contract files and coordinated with the appropriate vendors to verify that the information and design data were available to adequately address this issue.
Upon completion of this effort. TVA determined that there was sufficient data available to support the use of the Westinghouse Electric Corporation (W) type AR440 relays. However, TVA did not find sufficient data to support the use of f
the Potter Brumfield MDR 134-1 relays specified to be installed in the current i
design. Therefore, the existing SQN AMSAC design will be modified to utilize the H type AR440 relays exclusively as its isolation device between the class 1
1E and non-class-1E interfaces.
The following information is provided as required by appendix A of reference 2 i
to support using the y type AR440 relays as isolation devices.
This j
information is rapplemented by the actual test reports, which are contained in r
l enclosure 3.
j A.
Specific testing criteria of these isolation relays are described in the 3 test reports, which are contained in enclosure 3.
Refer to page 4 of H Procedure No. EQTP(84)-019 revision 2, and page 3 of M Test Procedure l
No. EQTP(84)-019 revision 2. addendum I, supplemental testing, for the test requirements.
The tests successfully demonstrated the acceptability of the AR440 relay for coil-to-contact and contact-to-contact isolation
(
for voltage of 250-volt (V) direct current (de) and 580-V alternating
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current (ac).
i B.
The isolation relays must be capable of withstanding the fault currents and voltages to which they are potentially subjected.
The relays used for i
AMSAC isolation receive a non-class-1E 120-V. 310-percent signal on the coilt and the class 1E signals are pieced on the relay contacts.
The two parameters that could cause the non-class-1E coil voltage to affect the class 1E contacts are excessive currents and overvoltage.
1.
Overvoltage The relays are supplied from the 120-V. ac preferred power system, This system is normally fed f rom an inverter power supply but may be 4
fed for an extended period from a 480/120-V transformer.
The maximum voltage that the transformer will supply to the system under worst-case system overvoltage is 132 v.
In an abnorrni conditien, a shorted transforner winding could fail and impress a soltage of about 504-V ae onto the relay coil.
The cable from the transformer to the relay will be routed as a voltage level 3 cable, which is defined as less than 300 V with all circuits protected by a device smaller than 30 amperes.
This cable, because of the routing restrictions, cannot come into contact with circuits that exceed 504 V.
Hence, the 504 V assumed from a failed transitareer is the maximum fault voltage that can be impressed on the coil of the relay.
2.
Fault Currant Relays, when used for isolation between qualified and nonqualified voltage sources, are normally evaluated to show that a fault current on the controlled contacts (produced by a failed non-class-1E component) will not induce failures on the safety-related circuits.
The purpose of this evaluation is to prevent a spurious signal from causing the failure of a safety-related component.
The safety-related signal (voltage) as used in' the AMSdC circuits is placeu on the contacts of the relay.
In this application, fault currents induced from a non-gafety source.annot be seen by the relay because of the limiting effects of the coil resistance. Hence, failures in non-safety-related circuits cannot be induced onto the safety-related circuits.
The above discussions only apply to an isolation relay in which the non-safety signal i. placed on the coil and the safety circuits are placed on the relay contacts. Separation of the relay terminals has not been evaluated because the isolation requirements for the terminations are covered by the separation criteria for wiring methods, not the isolation device requirements.
l C.
This item is not applicable to relay testing; however, the isolation testing includes coil voltsge teseing and testing for Isakage current between contacts, as described in the test procedure section on page 6 of H Procedure No. EQTP(84)-019, revision 2, and page 4 of H Test Procedure No. EQTP(84)-019, rev'sion 2 addendum I, supplemental testing.
D.
The pass / fail criteria are defined in the acceptance criteria en page 8 of H Procedure No. EQTP(84)-019, revision 2, and page 5 of M Test Procedure No. EQTF(84)-019, revision 2, addendum I, supplemental testing.
E.
The AMSAC design, when implemented, will comply with the seismic and environmental requirements (10 CFR 50.49) in which the isolation devices will be required to operate.
F.
Although no testing of this type has been done, adequate grounding capability is provided; and many years of operating experience with this type of applications have demonstrated no electrical interference problems.
t G.
This item is not applicable to relay testing.
Based on the information provided above, TVA believes that the SQN AMSAC i
i design, when implemented, will conform to isolation device requirements as j
specified in appendix A of reference 2.
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. !. s rit ENCLOSURE 3 1.
"Isolatiot. Tests for Westinghouse Type AR Relays Used in Auxiliary Relay Racks," W Procedure No. EQTP(84)-019, revision 2 (B25 881007 002).
2.
"Isolation Tests on Westinghouse Type AR Relays (Supplemental Testing)," W Test Procedure No. EQTP(84)-019, revisiop 2, addendum I (B25 881007 002).
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ISOLAT!ON TESTS FOR RIMS, SL26 C.K d WESTINGHOUSE TYPE AR RELAYS USED IN AUXILIARY RELAY RACKS 851009A0025 PROCEDURE NUH8ER:
EQTP(84) 019. REY. 2
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SEPTENBER 1985 1
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B45 '85 0927 351 ISOLATION TESTS FOR RIMS, SL26 C K(
TESTINGHot!!E TYPE AR RELAYS USED IN AUXILIARY RELAY RACKS 851009A0025 PROCEDURE NUMBER:
EQTP(84) 019. REY. 2 Qi
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LESTINGHOUSE PROPRIETARY CLA$$ 3 EQTP(84) 019, REY. 2 SUMARY WESTINGHOUSE TYPE M RELAY ISOLATION TESTE Electrical tests w re performed on three Westin; house type AR relays to demonstrate and document their cotl to contact and contact to contact isolation capabilities.
Voltages of 580VAC and 250VDC were applied in these tests to determine leakage path resistances.
teceptance for isolation was based on the criterton that the leakage path resistances for all tests be greater than 1 megohn.
All three relays tested exhibited leakage path resistances exceeding the criterton by factors ranging from approxtsately 40 to 30,000, demonstrating that they are effective electrical isolation devices.
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WESTINGHOUSE PROPRIETAAY CLASS 3 EQTP(04).019, REY.2 1
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INDEX
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Page 1.
Objective 4
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2.
Equipment to be Tested 4
3.
Test Requirements 4
)
4.
Test Procedures 6
5.
Required Test Data 7
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6.
Acceptance Criterton 8
7.
Doc m..tation Requirements 8
8.
Test Results 9 10 9.
Figures 11-14 10.
Data 15 19 3
PAGE 3
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WEtilNGHOUSE PROPRIETARY CLASS 3 EQTP(84) 019 REY. 2 l
1.0 OBJECTIVE 1
The objective of this test is to verify the isolation capability -
of the AR Relays used in the Auxiliary Relay Racks. Westinghouse type AR Relays have been used as isolation devices between IE and non-1E circuits in the Protection System cabinets where the relays have been qualified for this use by virtue of cabinet qualtffcation tests.
The Auxiliary Relay Racks ARA) have historically provided a housing for AR type relays ser(ving control grade circuits and, as such, were not quallf ted.
When the ARR were installed at some plants, all external wiring connected to the trsin designated cfreutts were routed with legitimate Class IE wiring.
Consequently, all train designated wiring must be treated as.
associatad circuitry as defined in Regulatory Guide 1.75 and IEEE Standard 384-1974.
The question now arises as to wilether the integrity of any Class IE Systems are significantly degraded due to the association with train wiring from the relay racks.
2.0 EQUIPMENT TO BE TESTED Testing is to be performed on the following relays built to drawing 765A624.
QUANTITY NO. OF POLES CATALOG NUMBER STYLE 2
4 AA440AR 766A025G09 1
4 NAR880AL 7518297603 30 TEST REQUIREMENTS 2
3.1 General Requirements The relays were tested at the Westinghouse Nuclear Services Integration Olvision (Tred test equipment and manpower were VHS10) ITTC facility in Monroeville, Pennsylvanta.
All requ provided by VNSID.
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u-WESTINGHOUSE PROPRIETARY CLASS 3 EQTP(84) 019 REY 2 Engineering bench tests were conducted on Westinghouse type AR relays to verify the isolation capability of the relay.
Three AR 440 relays (4 pole) were tested for isolation between contacts and coli and between contacts. Only 4 pole relays u re tested, based on the assumption that the i
contacts added for the 8 pole relays are at greater distances from the coli than the contacts of the 4 pole relays and would not add to the credit
- titty of the tests.
(Four poles were removed from the 8 pole rela obtain a third, 4 pole relay for the tests.) y, NAR880AL, to 3.2 Test Eaulpment A detailed list of test equipment used for the isolation testing is included in the test log book.
The IIst includes:
1.
Megoheneter 2.
Digital Voltmeters 3.
Digital Micro anneter 4.
580 VAC Pont Source 5.
250 VDC Power Source 6.
Wood Mounting Plate 7.
Terminal Blocks 8.
- 12 and #16 AVG Type K wire, per specification MIL W.
16878.
3.3 Mountino Requirements le equipment was r-unted on a piece of 3/4' thick plywood I
( lgure 9.1) with d mensions large enough to accomodate the three ret.y? to te tested and terminal blocks T81. T82 and TB3.
The wirl" (rom the relays to the terminal blocks was bundled togethe.ising tie wraps as shown in Figure 9.1.
PAGE 5 2^
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r WESilNGHOUSE PROPRIETARY CLASS 3 EQTP(84).019 REY. 2 3.4 Electrical Connections Electrical connections to the equipment were made using spade lug terminals and connectors as required.
Each piece of equipment shall be interconnected to its associated test equipment as indicated in Figures 9.2 thru 9.4.
The inter-connections and operation of each piece of equipeent was I
the responsiblitty of _WNSID personnel.
3.5 Responsiblittles Nuclear Services Integration Olvision was responsible for defining the electrical connections, electrical monitoring of the equipment under test, and test equipment calibration.
3.6 Monitoring Recutrements Applied Test voltages, leakage currents, induced voltages
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and values of resistances were measured and recoried when data was taken according to the test procedure.
The accuracy of the recording instrumentation sht11 be 11.07,.
M TEST PROCEDURE Testing was done at reorn ter.perature using both 580 VAC and 250 VDC to simulate faulted conditions and 1090 VDC to measure insulation resistances.
4.1 TEST 1, The test voltages were applied in turn (580 VAC first; 250 VOC second) between the contacts and coil with thn leakage current and test voltages measured and recorded after one minute (Figure 9.2.
The time of one minute allowed any transients in the system to decay.
PAGE 6
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WESTINGHOUSE PROPRIETARY CLASS 3 EQTP(84).019. REY. 2 4.2 TESTI The test voltages were applied in turn between contacts and ground and the induced coil voltage measured after one minute.
The coil was loaded with a 1.3 ohe resistance (figure 9.3). One minute after the test voltage was applied, the test voltages and leakage currents were seasured and recorded.
The 1.3 che resistor was selected to represent the source lopedance of any supply connected to the coll.
4.3 TEST 3 The test voltages were applied in turn between adjacent contacts (Figure 9.4) and the leakage current measured after one minute.
After one minute of the test voltage application, the test voltage and leakage current were measured and recorded.
4.4 INSULATION RESISTANCE TESTS The insulation resistances between the relay cotl-to frame, coil to contacts, contacts to-frame, and contact to contact were measured using a megometer before starting Tests 1,
2 and 3 and after completing them.
M REQUIRED TEST DATA The test data included, but is not limited to the following:
1.
All test recordings, which were clearly identiffed and scaled.
2.
A listing of all equipment used for the test.
3.
All significant events (i.e.,
start of test, abnomal occurrences, etc.) were noted and clearly identified in a logbook (See Section 7.2).
4.
A log and data sheet recording the completion of test steps defined in Section 4.0.
5.
Photographs (see Section 1.3) of the test setup and equipment.
PAGE 7
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j WESTINGHOUSE PROPRIETARY CLASS 3 EQTP(84) 019, REY. 2 i
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,6J ACCEPTANCE CRITERl0N If the leakage path resistance in a11' cases was greater than 1 negohs, the relays will have demonstrated the proper isolation exists between coil and e,ontacts and between co.itacts.
This criterion was derived from the applicable relay test procedures of EIA Standard RS 407 A using the highest test voltage of 580VAC and then applying a safety factor of approximately two to yleid a stronger acceptance criterion.
1 7.0 00CtNENTAT!0N l
7.1 (he test results are given in Section 8.0 and includes the following information.
I a.
A listing of all instrumentation used to collect data including model number and sertal number.
b.
A summary of all data collected to satisfy this specification.
7.2 Lo2 Book o
The test log included the following:
a.
Data and time of each test activity.
b.
Signature of personnel making the entry c id responsible
(
test engineer, L
i Any devidtton from this test specification to be signed c.
by MN510 engineers.
d.
An entry stating the completion of the test.
e.
Photographs.
l 7.3 Photographs All photographs are u' lack and white, 8 x 10 inch glossy.
Photographs were taken of the test setup with test equipment for each test configuration.
PAGE 8 1
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WESTINGHOUSE PROPRIETARY CLASS 3 EQ1P(84) 019. REY. 2 8.0 TEST RE5 utis The AR Relays were tested according to the overall isolation test plan as outilned in Section 2 through 7 for the Auxiliary Relay Racks AR Relays on November 8th and 26th.
The objective of this test was to verify the isolation capacity
(>l negohn)~ of the AR Relays used in the Auxtllary Relay Racks.
The three AR relays tested (numbered one, two and three) were f
CONTROL IOOEL RELAY NO.
NO.
STYLE I
AR440AR 766A025G09 2
AR440AR 766A025G09 3
MAR 880AR 7518297G03 The Number 3 Relay, NAR880AR had four contacts removed so that it was equivalent to the other AR440 reiays.
The relay contacts were normally open.
The three relays u re mounted and wired according to the test plan.
l Visual inspection of the relays before testing did not disclose.
any obylous material deterioration.
{0VIPNENT LIST I
N00EL SERIAL NtMBER CALIBRATEOLTE l
Fluke 8502A 2945038 5 21 84 Digital Hultimeter Fluke 8502A 2175033 5 21 84 Digital Multimeter Fluke 8505A 3535009 8 16 84 Olgital Hultimeter Fluke 80248 2930396 7 11 84 Digital Hultimeter Hewlett Packard 1207J06240 32984 Capacitance Meter General Radio 4260 11 4 83 1864 Hegohreeter 1
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WESTlHGHOUSE PROPRIETARY CLASS 3 EQTP(84).019. REY.2 l
Hewlett.Packard IS02503 N/A*
6515A OC Power Supply AC Power Supply N/A N/A*
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- Power supply voltages set and/or measured with the Fluke 80248 multimeter.
3~
A preliminarry insulation resistance measurement was made on the relays with the General Radio negohmeter using a voltage of 1090VOC.
The results are shown on data sheet one. Table 10.1.
The insulation resistance for all tests (exc9pt No. 3 relay contact to Frame) was greater than 1000 megehen which greatly exceeded the acceptance criterion of I negohn.
The relays were then tested with 250VDC' and $30VAC.
The DC isolation-reste 4 s shown on data sheet two. Table 10.2 were greater th. a magohms which exceeded the acceptance criterion.
Therefore, OC isolation between contact and coil and between contacts was proven by the tests.
I The AC impedance values were measured according to the test plan and the values are IIsted on data sheet three. Table 10.3.
The i
test voltage used was 580VAC.
All AC impedance values were greater than the acceptance criterion of 1 megohm.
The megehmometer was used to measuru the insulation resistance after the test data was taken and the values are tabulated on l
data sheet four, Table 10.4.
All values were greater than 1000 megohms.
i In the test procedure the induced voltage in the coil and the resultant current flow were measured when the coil was shorted with a 1.3 ohta resistance and the test voltage was applied between the contacts and the frame.
Results are tabulated on data sheet five, Table 10.5.
l The induced coil voltage and the resultant current flow if the i
circuit is completed would not lepair normal operation of the l
circuit.
In conclusion, since the acceptance criterion for the planned tests was exceeded, the AR Relay has been demonstrated to be an effective isolation device for use in the Auxiliary Relay racks.
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a WESTINGHOUSE PROPRIETARY CLASS 3 EOTP(Hi-10. Rev. a 44/40/llH21
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1 WESTINGHOUSE PROPRIETARY CLASS 3 EDTP(84) 019 REY. 2 7
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TABLE 10.1 DATA SHEET ONE I
INSULATION RESISTANCE I
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Test values before relay testing in negohms,11/8/84.
RELAY C0ll TO COIL TO CONTACTS CONTACT NO ~
TRME-EURTACT 7070RE TOTORTACT
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I 4400 2400 1450 1300 t
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3100 2400 1160 1300 3
2800 2200 900 1120 l
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WESTINGHOUSE PROPRIETARY CLA55 3 EQTP(84) 019, REY. 2 I
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TA8LE 10.2 l
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Insulation resistance in Megohns,11/8/84.
l TEST 1 TEST 2 TEST 3 i
RELAY EDTE To (URTACT TO CONTACTTO~ CONTACT i
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f CURTACTS FRJRF ~
IF H3 314 l
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28,000 25,000 59.5 60.2 59.8 2
31,000 20,800 59.4 59.2 59.1 1
3 31,000 23,000 59.5 59.5 59.5 i
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WESTINGHOUSE PROPRIETARY CLAS$ 3 EQTP(84).019, REY. 2 1
TEST 10.3 DATA SHEET THREE NfRELAY!$0LATIONTESTS 589yAC Irpedance value in regohms, 11/26/84.
TEST 1 TEST 2 TEST 3 I
RELAY f51I To CDhTICT CONTACTT5 CONTACT T
C6fifACTS T.07WE 181 H3 as4
~ 9-1 53.7 175.75 45.96 46.80 49.2 E
2 50.04 189.54 41.84 45.24 45.21 r
3 66.74 331,43 39.19 53.7 57.26 L
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l WESTINGHOUSE PROPRIETARY CLAS$ 3 EQTP(84) 0!9, REY. 2 l
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L TABLE 10.4 i
DATA p,iEET FOUR AR RELAY _! SOLATION TESTS
- l INSULATION RESISTANCE 1090yDC i
i Test values after relay testiry in megohms, 11/8/84.
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l RELAY C0ll TO C0ll TO CONTACTS CONTACT W
FWE~
CDRfACTS 767AME TDTORTACT FL6TJT1 1
4400 2200 2000 1500 3
2 3000 2300 1500 1260 3
2600 2100 1350 1080 l
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DATASHE!!If!VE i
AR RELAY ISOLATION TESTS I
1
-580 VAC.&. _250 _VDC I
I TEST 2, induced coil voltage and courrent, test voltages appllid between contact and frame.-
Coll loaded with a 1.3 chs resistor; ?$0 VOC TEST 11/8/84, 580 VAC TEST, 11/26/84.
l 580VAC 250VDC C0ll C0ll C0ll C0ll RELAY NO.
YOCTEE COMENT VOCTRE CURRIRT mT~
rA mV rA ~
l 24 3.5 0.09
.773
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25 3.35 0.086
.757 3
21 8.50 0.083
.761 PAGE 19 9
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,ra December 22, 1986
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Westinghouse Water Reactor weeaomec omson Electric Corporation Divisions 5
se,333 Pmstxsgh Pennstvanta 15230 0355 TVA Contract
- 71C62-54114-1 Mr. H. B. Bounds WAT-D-7246 Project Engineer NS-OPLS-OPL-I-86-380 DNE Onsite, WBN IOB Watts Bar Nuclear Power Plant
.S.O. WAT/WBT-4705 I
' Spring City, TN 37381 Ref: WAT-D-7170 0
TDitFME VALLEY ATEHORITY WATTS BAR NUCLEAR PLANT UNITS NUMBERS 1 AND 2 EVALUATION OF SAFETY PARAMETER DISPLAY SYSTDI (SPDS)
AR REI.AY TESTI?X)
Dear Mr. Bounds:
In response to your request, attached is a report describing the results of the AR Relay Testing entitled Isolation Tests on Westinghouse Type AR Relays (Supplemental Testing), Test Procedure EQTP(84)-019, Revision 2, Addendum I, dated 12/19/86. Bis is a Westinghouse Proprietary Class 3 (Non-Proprietary) report suitable for submittal to the NRC.
The testing was perfon::ed on the relays in 1) open contacts (high voltage) mode and, 2) closed contacts (high current) mode.
he coil (1E applications) was monitored throughout all phases of testing. There were no indications of any adverse affects imposed on the coil as a result of faults (high voltage and/or high current) occurring at the contacts of the relays.
I.f you have any questions or comments, please contact the undersigned.
Very truly yours WESTINGHOUSE ELECTRIC CORPORATION W&
hi-E. A. Novotnak, Panager Tennessee Valley Authority Projects L. V. Tomasic/dcr M
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Westinghouse Proprietary Class 3 EQTP(84} 019, Revision 2, Addendus !
t ISOLATION TESTS ON WESTINGHOUSE TYPE AR RELAYS (SUP,PLEMENTALTESTING)
TEST PROCEDURE EQTP(84)-019. REVISION 2. ADDENDUM I I/ !'
PREPARED BY:
D. Parshall, Class IE Systems REVIEWED BY:.b.b R. E. Uebel, Class IE Systems APPROVED.BY:
- 1Mo /2[/p//6 C. G. Norris, Nanager, Class IE Systems 1ES.645 Page 1 of 14 O'O A 4 A Q // H A' t 0 /
7M V
/
P' 7 P' T
____j_.gf
'Westingh:use Proprietary Class 3 EQTP(84)-019. Revisicn 2. Addendum I INDEX PAGE 1.0 OBJECTIV,E 3
2.0 EQUIPMENT TESTED 3
3.0 TEST REQUIREMENTS 3
4.0 TEST PROCEDURE 4
5.0 REQUIRED TEST DATA 5
6.0 ACCEPTANCE CRITERIA 5
7.0 TEST RESULTS 5
8.0
SUMMARY
6 TABLE I TESTTOOLSANDCAOBRATION 7
J TABLE II DATA SHEETS 8
FIGURE 1 ELECTRICAL CONNECTIONS (OPEN CONTACTS) 13 I
FIGURE 2 ELECTRICALCONNECTIONS(CLOSEDCONTACTS) i 14 l
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Page 2 of 14
.. ).,, J Westingi;ouse Pr:prietary Class 3 EQTP(84)-019 Revisicn 2, Addendum 1 l
0 1.0 OBJECTIVE The objective of this supplemental testing is to further verify the isolation capabilities of the AR Relays.
Westinghouse type AR Relays i
are used as isoTatton devices between if and non 1E circuits.
Initial isolation testing was performed at Westinghousc Nuclear Services Integration Division (WNSID) ITTC factitty in Monroeville, Pennsylvania t
in November 1984.
The relays were tested for isolation between con-tacts and call and between contacts as documented in EQTR(84) 019, Revision 2 (September 1985).
Supplemental testing was performed at Westinghouse Seco Rond facility in Monroeville, Pennsylvania in December 1986.
The relays were tested for the tsolation capability between the contacts and coil in 1) open contact (high voltage) mode and 2) closed contact (high current) mode while the coil was being monitored for anf induced call voltage.
2.0 EQUIPMENT, TESTED Testing was performed on Westinghouse Type AR Relays identiffed as follows:
Quantity 1 Poles Catalogi Style 2
4 AR440AR 766A025G09 3.0 TEST REQUIREMENTS 3.1 General Engineering bench tests were conducted at Westinghouse Seco Road Assembly and Test factitty.
Two (2) relays were tested for isola-tion between contacts (non 1E Circuits) and coil (1E Circuits).
The insulation resistance of each relay between all contacts (connected in parallel) and cofi (terminals connected together) was measured and recorded using a megometer (500 VOC) before tests.
Each relay was subjected to a preliminary dielectri-test where 2000 VAC was app 1ted between contacts and cofi.
Ala'ms were set on the hypot tester at imA.
Open Contact Mode & Voltage Testing)
Tes't voltages of 120 VAC, 240 VAC and 580 VAC were appifed in turn to the open contacts (Figure 1) for one (1) minute and the coil was monitored for any induced voltage.
a Page 3 of 14
' Westinghouse Proprietary Class 3 EQTP(84) 019, Revision 2, Addendua !
Closed Contacts (High Current Testing)
A test voltage of 120 VAC was applied to the closed contacts (connected.in series).
A 12.4 ohm series resistive load (heater) and a fuse (15A) were used to limit the current through the closed contacts (Figure 2).
ainute.
The coil was again monitored for one (1) 3.2 Test Equipment A list of test equipment used for the isolation testing is included in the test log book and is provided in Table 1.
3.3 Monitoring Requirements The following parameters were nessured and recorded:
Applied test voltageInsulation resistance between contacts and input current
. induced coil voltage 4.0 TEST PROCEDURE 4.1 Les_tSecuence et Data is provided in Table 2.
4.1.1 Measure insulation resistance (at 500 VDC) between con-tacts and coli (de energized).
4.1.2 Apply 120 VAC to open contacts (Figure 1) 4.1.3 Record parameters after one (1) minute (Table 2) 4.1.4 Repeat 4.1.2 and 4.1.3 at 240 VAC 4.1.5 Repeat 4.1.2 and 4.1.3 at 580 VAC 4.1.6 Apply 120 VAC to closed contacts (Figure 2) 4.1.7 Record parameters aftar one (1) minute (Table 2) or until fuse blows.
Page 4 of 14
Westinghouse Proprietary Class 3 EQTP(84) 019, Revision 2, Addendua 1
-5.0 REQUIRED TEST DATA S.) A Ifsting of 'all equipment used for test (Table 1).
5.2 All test recordings (Table 2).
5.3 Log book recording start of test, completion of test steps, abnormal occurrences, deviations from test procedure, etc.
l 6.0 ACCEPTANCE CRITERIA *
- /
Insulation resistance of greater than 1 negohm (at 500 VDC) between contacts and co.
Dielectric test - leakage current not to exceed imA.
7.0 TEST RESULTS The AR Relays were tested according to the isolation test procedures in Sections 3 and 4.
Insulation resistance measurements were made on the relays (between contacts and cofi at 500 VDC prior to testing.
The resistance was g)reater than 100 megohms which insulation greatly exceeded the acceptance criteria of 1 megohm.
A preliminary dielectric test wrs performed by applying 107) VAC across the open contacts and the coil.
Alarms were set at imA on the Hypot tester.
None of the Alarms were activated, indicating that the leakage current between contacts and coil was less than itaA.
Open Contact Mode (High Voltage) Testing A test voltage of 120 VAC was appifed to the open contacts (Figure
- 1) for one (1) minute. An induced cofi voltage of 1.15 E 06 volts
.a:!as recorded.
(Data Sheet 1).
A test voltage of 240 lAC was appiled to the open contacts (Figure 1) for one (1) minute. An induced coli voltage of 1.15 E-06 volts was recorded.
(Data Sheet 2).
A test voltage of 580 VAC was applied to the open contacts (Figure
- 1) for one (1) minute. An induced cofi voltage of 1.17 E 05 volts was recorded. (Data Sheet 3).
- Derived from EIA Standard RS 407-A, (July 1978),
Testing Procedures for Relays for Electrical and Electronic Equipment Page 5 of 14 i
.'**.' ' bestinghouse Proprietary Class 3 E"TP(84) 019, Revision 2, Addendu2 I Closed Contact Mode (Hich Current) Testing A test voltage of 120 VAC was appifed across the closed contacts for one (1) minute. The current obtained through the contacts was 8.93 Amps.
The coli voltage after one (1) minute was 4.98my.
After this test, the relays were disastembled and the contacts were visually inspected.
No signs of deterioration of the contacts were observed as a result nf this test (Onta Sheet 4).
Additional High Current Testing L
The relays were subjected to a series of test voltagLs. For Relay 02, the voltage was adjusted to 140 VAC to obtain a current of 10.38 Amps.
The voltage was then increased to obtain current steps of approximately 1 amp each (Data Sheet S). After the final current step (290 VAC to obtain 19.8 Amps), Relay 92 was disassembled.
Visual inspection of the contacts showed 25% of contacts had deterforfsted (pitted) and all remaining contacts had discolored. However, the contacts did, tot burn open.
Relay Il was alsc ~Jbjected to a series of test voltages to obtain current steps of approximately 5 Amps each step (Data Sheet 6.
After the final current step (265 VAC, 19.8 Amps),
the relay w)as disassembled.
Visual inspection of the contacts showed discoloration of the contacts.
However, no pitting was observed.
It is believed that pitting occurred on Relay #2 contacts because the contacts were subjected to the higher currents for a longer period of time.
8.0
SUMMARY
in conclusion, Westinghouse Type AR Relays have been tested as isolation devices with testing documented in EQTP(84)-019, Revision 2 "Isolation Tests for Westinghouse Type AR Relays Used in Auxiliary Relay Racks" and EQTR(84)-019, Revision 2, Addendum I, "Isolation Tests Westinghouse Type AR Relays (fupplemental Testing)".
Testing has on demonstrated that undet abnormal vo.'tage and current conditions (faults) occurring on the contact side of the relay, there was no gross failure of coil / contact isolation capabilities.
The coil volta)e was monitored throughout all phases of testing and, although the induced voltages were quite small, evaluation of their ultimate. acceptability should be based on the specific appifcation of the AR relays.
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i Page 6 of 14
.'"'e Westinghouse Proprietary Class 3 EQTP(84) 019, Revision 2, Addenduz !
TABLE 1, TEST TOOLS AND CALIBRATION EW0 #
861.050, Revision 0 TEST COMPLETION DATE 12/15/86 Manufacturer Model -(Description)
Last Calibration Date Fluke Temperature Probe 12/12/5; l
Fluke Dioital Multimeter e/dz/re Keithley Dioital Multimeter 9/24/60
_5' mnson Amometer 7/10/50 Westinchouse Amometer 7/10/5e Westinchnuse Test Bench M/5/96 N/A Resis':ive Lnad (Heater)
N/A A&R Hnnt "ester 7/8/86 e
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Westinghouse Propnetary Class 3 EDTP(84)-419, Revis'en 2, Mdendum I TABLE 2 l
AR RELAY ISOLATION TEST DATA SHEET 1 - 120 VAC TEST'(OPEN CONTACTS R5.AYN0.1 RELAY NO.2 NSULATION RESISTANCE 33,3 3 33 (MEG 0HMS) l APPLED VOLTAGE (VAC) 120 120 INPUT CURRENT (uA) 4,71 s,24 INDUCED C0tt V0LTAGE (uV) 1,14 1.15
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TABLE 2 ' continued)
AR RELAY ISOLAT10N TEST DATA SHEET 2 - 240 VAC TEST (OPEN CONTACTS)
RsAY NO.1 RELAYNO.2 NSULATION RESISTA'NCE 3333 3333 (MEG 0HMS)
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APPLED VOLTAGE (VAC)24o 240 INPUT CURRENT (uA) s,si 9.8s INDUCED C0ll VOLTAGE (uV) 1.14 1.is e
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Westinghouse Proprietary Class 3 EDTP(84)-019, Revisbn 2, Mdendum I TABLE 2 (continued)
AR REl.AY ISOLATION TEST DATA SHEET 3 - 580 VAC TEST (OPEN CONTACTS)
REl.AYNO.1 RELAY'NO.2 i
i NSUl.ATION RESISTANCE 33,
- 33o, (MEG 0HMS)
APPLED VOLTAGE (VAC)saa sao INPUT CURRENT (uA) 23.07 23 ss INDUCED C0ll VOLTAGE (uV) 1.17 1.17
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AR REl.AY ISOLATION TEST DATA SHEET 4 - 120 VAC TEST (CLOSED CONTACTS)
RELAYN0.1 RELAY NO.2 APPLED VOLTAGE (VAC)120 120 INPUT CURRENT (Amps) s.93 9,1s ItDJCED C0ll VOLTAGE (mV) 4,98 3,48 o
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AR RELAY ISOLATION TEST DATA SHEET 5 - HIGH CURRENT TESTS (CLOSED CONTAC 1
RELAY N0.1 APPUED TEST VOLTAGE INPUT CURRENT INDUCED C0ll VOLTAGE 70'VAC 5.28 Amos 2.35mV 135 VAC 10.11 Amos 5.06mV 200 VAC 15.13 Amos 7.03mV 265 VAC 19.80 Amos 8.63my RELAYNO.2 APPUED TEST VOLTAGE,
INPUT CURRENT INDUCED C0ll VOLTAGE 140 VAC 10.38 Amps 2.57nY 150 VAC 11.0 M ps 2.80mV 165 YAC 12.0 Amos 3.26mV 180 VAC 13.0 Amos 4.5'knY 190 VAC 14.0 Amos 6.05mV t
210 VAC 15.0 Amos 6. 7 5 m'.'
215 YAC 16.0 Amos 7,4AmV 230 VAC 17.0 Amos 7.93ti 290 VAC 19.8 Amos
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FIGURE 2: ELECTRICAL CONNECTIONS (CLOSED CONTACTS)
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