SUMMARY REPORT

THE NEUTRON MONITORING SYSTEM (NMS)

ELECTRICAL CIRCUIT ISOLATION TEST

T.C. McCLE , RESPO S BL NGINEERDATE

.C. BOEHM, PRINCIPAL ENGI EERVERIFIER

DATE ~/IIC.F..C , AGERPLANT ELECTRONIC SERVICES

DATE P7 H

8805050378 880307PDR ADOCN, 050004ioIe PDR

DRF AOO-03209

ABSTRACT

Tests were performed to demonstrate the ability of afuse, resistor — divider network and zener diode toprovide electrical isolation between safety functiontrip signals and non-safety computer and recordersignals. The resistor — divider, fuse and zener diode(on the output of an operational amplifier) met therequirement of providing isolation of the trip signalfrom faults at the computer and recorder connections.The tests performed demonstrate that under all crediblefaults at the connections to the computer or therecorder, there is no adverse affect on the tripsignal.

1.0 INTRODUCTION

This report is an evaluation and discussion of thetests performed on an interface isolation circuitconfiguration used in the Average Power RangeMonitoring subsystem of the Neutron Monitoring System.

This high resistance — fuse network isolates AveragePower Range Monitor signal voltages to the tripcircuits from the voltages sent to computer and recorderinterfaces. The voltage source is an averagingoperational amplifier that averages the inputs from theLocal Power Range Monitors and produces a voltageproportional to reactor power.

These interface circuits are resistive voltage dividerconfigurations. One circuit provides a 0 — 160millivolt signal to the computer; a second circuitprovides a 0 - 1 volt signal to the recorder.

2.0 BACKGROUND

The Neutron Monitoring System and the Average PowerRange Monitoring System circuits used to isolate thenon-safety functions from the safety trip function hascome under question by the NRC. The NRC questionedthe adequacy of resistors and fuses as isolationdevices, and requested that their performance bedemonstrated by test.This circuit design dates from the Neutron MonitoringSystem design for the BWR/3s in the 1970s. As suchthere are more than 250 reactor-years of operatingexperience in the USA with these circuits withoutreports or evidence of generic faults.The design of these circuits is rational and practical,rather than required by some standard or regulation.The initial design preceded the guidelines andstandards now applied. However the design recognizedthe need for isolation between the output signals fromthe operational amplifier. This design achieved theisolation with an established circuit, ie, the voltagedivider of resistors, the use of a fuse and wherepractical, the use of a zener diode. This design is asimple circuit that was readily analyzed to show it tobe effective in all reasonable failure modes. Thiseffectiveness has been demonstrated under the testsperformed for this report.

3 . 0 RESULTS

The Neutron Monitoring System isolation circuits havebeen tested under a variety of faults to demonstratethat the trip signal is protected per the requirementsof IEEE 384-1977, Criteria for Independence of Class IEEquipment and Circuits.The fuses in the isolation circuits opened promptly(less than 2 milliseconds) under the application offault voltages at the output terminals to the computeror the recorder interfaces.During fuse opening time and for short circuit and lowlevel fault conditions which may not cause the fuses toopen, the high resistance in the voltage dividerprotects the trip signal and the operational amplifier.These resistors are the 10.7K (R7) or the 9K (R9 + R10),as shown in Figure 4.1. This protection isdemonstrated by the small changes in the output of theoperational amplifier (to the trip circuits) when faultsimulations were applied at the output connections tothe computer or the recorder.

I

4.0 THE CIRCUIT

4.1 Neutron Monitoring System Elementary

The circuit tested is,outlined on a typical elementarydiagram, Power Range Neutron Monitoring System,807E163TY, sheet 12, attached. The dc amplifier, Z32,drawing 225A6679BB, is a prepackaged, encapsulatedoperational amplifier, input supply voltage filtercapacitors, and an adjustment resistor. The amplifierspecifications are shown on drawing 174B9091. Itsspecifications include a high gain, high inputimpedance and a low output impedance. The remainingcomponents — input resistor, feedback resistor,voltage divider resistors, zener diode and fuses-are defined by auxiliary unit, Z31, drawing 112D1907,and the averaging card, Z30, 136B2158.

The circuit function is to average the input voltagesfrom 22 (typically) local power range monitors, andprovide an average power range monitor signal to thetrip circuits, computer and recorder. In addition, thecomputer and recorder signals are isolated from thetrip signal by a resistive voltage divider and fusecircuits.

4.2 Test CircuitThe equivalent circuit tested is shown on Figure 4.1,Test Specimen Schematic Diagram. This circuit is thefunctional equivalent of the partial circuit high-lighted on the elementary diagram, 807E163TY, Sheet 12.The key portions of the circuits performing theisolation function are shown in Figure 4.2 and Figure4 '

'.3Circuit Operation

Figure 4.2 is a voltage divider of resistors and a1/32 ampere fuse providing a 0 to -160 mvolt signal tothe computer. The fuse is designed to open in 5seconds at 200% of its rated current (drawing209A5156P005). The 174 ohm resistor to common requires10.875 Vdc to conduct this 2004 current. Thiselectrical path to common, having the lowest resistancewill be the route of any overcurrent faulted condition.The fuse opening time decreases with increasedovercurrent.

Figure 4.3 is a voltage divider of resistors, a zenerdiode across the low resistor (1K) and a 1/32 amperefuse providing a 0 to -1 volt signal to the recorder.The fuse characteristic is the same as for the fuseused in Figure 4.2. The zener diode conducts most ofthe .current in order to .allow the fuse to open whenrequired. In Figure 4.2, the 174 ohm resistor allowssufficient current to flow to open the fuse whenrequired. In the circuit represented on Figure 4.3,the resistors are higher values, so a zener was usedin the design to allow the fuse clearing current toflow when external voltage faults occur. A smallpositive voltage across the zener diode will causeforward conduction current to flow until the fuseblows. Approximately -11 volts across the zener diodewill cause maximum rated current to flow through thezener (approximately 90 mA) which will be sufficient toblow the fuse.

4.4 Circuit Faults

An open circuit in the high resistor (10.7K or 9K) hasno effect on the output of the operational amplifiertrip signal.A short circuit to common in the output of theoperational amplifier will cause a downscale trip.This short circuit would have no effect on the inputsignals because of the high resistance path through thefeedback resistor (1 megohm) and the high inputresistance (499K + 499K). This is demonstrated by thetests in Section 5.0 on the 10 Kohm voltage dividerwhich provided isolation. Two megohms (1M + 0.499M +0.499M) provides even greater isolation.The operational amplifier design includes internalshort circuit protection. The output merely clamps tozero and returns to normal when the fault is removed.

An open circuit between the voltage divider ofresistors has no effect on the trip signal, althoughthe signal to the computer or recorder would be lost.A short circuit to common between the voltage dividerof resistors also has no effect on the trip signalbecause of the high resistance path provided by the10.7K or 9K resistors. The signal to the computer orrecorder would be lost.

1

Protection against the misapplication of voltages tothe computer or the recorder connections is providedby the voltage divider and fuse circuits as discussedin 5.0, THE TESTS. The maximum credible voltage thatcould be applied is 120 Vac, RMS, which has peak valuesof +170 V, -170 V.

5.0 THE TESTS

5.1 Baseline Functional Test

An initial functional test on the NMS isolation circuitwas performed to adjust and measure the amplifieroffset (balance), to adjust and measure the amplifiergain, and to measure the outputs to the trip circuits,the computer and the recorder. The zero offset and thegain were slightly out-of-tolerance, but these werejudged to be acceptable for this test of the isolationfunction.

5.2 Acceptance CriteriaFor all simulated faults the acceptance criteria are:

The fuse opens prior to damage or failure of theoperational amplifier. The trip output signal is notaffected or returns to normal after the fuse opens.

The output signal is degraded sufficiently to causethe safety action (a trip or alarm).

Failure or permanent damage to the operationalamplifier without causing the fuses to open isunacceptable.

5.3 170 Volt Transient Tests

Refer to Figure 4.1.

An 8 microfarad capacitor charged to +170 Vdc and to-170Vdc was used to provide the transient signal intotest point 1 (signal output to the computer) and intotest point 2 (signal output to the recorder). This170 Vdc simulates the peak value of 120 Vacinadvertently and transiently applied at the non-safetyrelated interfaces to the computer and recorder. Atransient recorder was used to record the plus/minus 15Vdc supply voltage, the 2.5 Vdc input voltage and thethree output voltages (trip, computer, recorder).

The 1/32 ampere fuse protected the operationalamplifier. It opened without damaging or failing thethe operational amplifier. The change at the tripoutput was an approximate -0.05 volt spike. The effectof this spike on the trip output depends on the tripsetpoints and signal level at the time of thetransient. It could cause a trip if the input signalwas already sufficiently close to the trip point.The input signal and plus/minus 15 Vdc supply voltagewere unaffected.

Thus the fuses, resistors and zener diode isolated thecomputer and the recorder, and protected the safety-related trip signal.

5.4 120 Vac Tests

Refer to Figure 4.1.

These tests simulate the inadvertent application of120 Vac to the computer output or the recorder output.The 120 Vac was supplied from a variac through amercury switch to the test point.When the voltage was connected to the computer output,the fuse opened immediately. The input signal, outputsignal and 15 Vdc supply voltage were unaffected.

When the voltage was connected to the recorder output,the fuse opened promptly, and the zener diode (VR1)short circuited. All of the monitored test points,except the computer output, varied during the fuseclearing period and then returned to normal. The inputsignal changed about +0.2 volts, and the output signalchanged about -1 volt. These changes would cause atrip if the signal was already sufficiently close tothe trip point. The shorted zener diode did not affectthe output signal because the remaining resistance of9K (R9 + R10) does not load the operational amplifiersufficiently to cause signal degradation.

Thus the fuses, resistors and zener diode isolated thecomputer and the recorder, and protected the output tripsignal.

5.5 Special Tests

These tests were performed to show the effects on theoperational amplifier output signal as follows:

a) during the fuse clearing period,

b) the degree of isolation provided by theresistor R7, 10.7K, when the fuse does notclear,

c) when the low resistance path to common(R8 or VR1 & R11) fails to an open condition.

Testing was performed with the test circuit conditionedthe same as for the previous tests. The tests (onFigure 4.1) consisted of the following:

o 5 Vac applied at test point E (computer output),o -20 volt step at test point 1 (computer output),o +20 volt step ato -15 -volt step at

test point 1,

test point 2 (recorder output),o -20 volt step at test point 2,

o +300 Vdc at testo -300 Vdc at test

point E with R8 open .to common,

point E with R8 open to common.

The low resistance path of VR1 and R11 at test point F isdemonstrated by similarity to the circuit with test point E.

The lower voltages (5 Vac, +20, -20, -15) were selectedto monitor circuit performance without stressing thecomponents, to demonstrate fuse clearing time at thesevoltage levels, and to demonstrate the low outputimpedance of the operational amplifier. The 300 Vdcwas selected to demonstrate isolation and protection ofthe operational amplifier output by the 9K or 10.7Kresistors alone.

The 5 Vac signal at test point E (computer output)yielded a very small change (0.2 mVac) in .the outputtrip signal. Similarly the step voltages yielded nochanges at the output trip signal. This indicates thatthe effective output impedance of the operationalamplifier is very low, as expected.

For the -20 volt step at the computer output the fuseopened in 1.8 milliseconds; for the +20 volt step thefuse opened in 1.6 milliseconds. The fuse overloadcurrent was approximately 3704 for both cases. For-the -15 volt step and -20 volt step at the recorderoutput, the fuse opened in 1.5 milliseconds. Thisindicates, at a reduced voltage, the ability of the1/32 ampere fuse, resistor divider and zener diode toprovide isolation and protection for the trip output.

For the +300 Vdc and -300 Vdc applied at test point E(computer output) with R8 open to common, the inputsignal and the 15 Vdc supply voltage were unaffected.

The trip output changed by less than +5 mvolts for +300Vdc and -300 Vdc. The relatively small changesdemonstrate the capability of the circuit to withstanda fuse fault and open circuit in the low resistancepath to common in the voltage divider. These smallchanges also demonstrate the very low dynamic outputimpedance of the operational amplifier and theassociated feedback circuit.

5.6 Final Baseline Functional Test

The results of the final functional test were the sameas the initial functional test. This indicates thatthe test circuit was not adversely affecte4-by thefault signal simulations.

10

6.0 REFERENCES

Letter R. Artigas to Ashok C. Thadani, Subject:"Meeting Results — NRC and GE Review of the NeutronMonitoring System Interface Isolation", September 21,1987.

NED0-10139, Compliance of Protection Systems toIndustry Criteria, June 1970.

General Electric drawings:

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DOCKET NO(S) . 50-410DISTRIBUTION w/0 encl~/PDI-1 Rdg.CVoganMHaughey

SUBJECT: NIAGARA YiOHAWK POWER CORPORATIONNine Nile Point Nuclear Station, Unit 2

~I

The following documents concerning our review of the subject facility are transmitted foryour information.

Notice of Receipt of Application, dated

Draft/Final Environmental Statement, dated ~ gr g

Notice of Availability of Draft/Final Environmental Statement, dated

Safety Evaluation Report, or Supplement No. dated

Environmental Assessment and Finding of No Significant Impact, dated

Q Notice of Consideration of Issuance of Facility Operating License or Amendment toFacility Operating License, dated

Q Bi-Weekly Notice; Applications and Amendments to Operating Licenses Involving No

Significant Hazards Considerations, dated [see page(s) ]Exemption, dated

Construction Permit No. CPPR- , Amendment No. dated

+ Facility Operating License No. , Amendment No. dated

Order Extending Construction Completion Date, dated

Monthly Operating Report for transmitted by letter dated

Annual/Semi-Annual Report-transmitted by letter dated

XOTHER: Bi-veekly Notice covering period through January 13, 1988. Expiration datefor hearing requests and comments; February 12, 1988.

Enclosures:As stated

Office of Nuclear Reactor Regulation

CC:

PDI-1~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

CVogan~ ~ ~ ~ ~ 08 1 ~ ~ ~ ~ ~ ~ ~

1/28/88

OFFICE/

SURNAME/

DATE)

NRC FORM 318 110/80) NRCM 0240 OFF I CIA L 8 EGO R D COPY

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

~ ~ 0 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

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September 2, 1987

DOCKET NO(S). 50"410

See Attached List of'ddressees

DISTRIBUTION w/o enclDocket File w/enclPDI-1 Rdg.CVoganMHaughey

SUBJECT: NIAGARA MOHAMK POMER CORPORATIONNine Mile Point Nuclear Station, Unit No. 2

The following documents concerning our review of the subject facility are transmitted foryour information.

+ Noti ce of Receipt of Appl icati on, dated

Draft/Final Environmental Statement, dated

Notice of Availability of Draft/Final Environmental Statement, dated

Safety Evaluation Report, or Supplement No. dated

Environmental Assessment and Finding of No Significant Impact, dated

Notice of Consideration of Issuance of Facility Operating License .or Amendment toFaci1 i ty Operating License, dated

Q Bi-Meekly Notice; Applications and Amendments to Operating Licenses Involving No

Si gni ficant Hazards Cons iderati ons, dated tsee page(s) ]Exemption, dated

Construction Permit No. CPPR- , Amendment No. dated

Facility Operating License No. , Amendment No. dated

Order Extending Construction Completion Date, dated

Monthly Operating Report for transmitted by letter dated

Q Annual/Semi-Annual Report-transmitted by letter dated

X OTHER: Bi-Meekly notice covering period through Aggust 26, 1987. Expiration datefor hearing requests and comments; September 25, 1987.

Office of Nuclear Reactor Regulation

Enclosures:As stated

cc: See next page

OFFICE/

SURNAME)

0AVE1

.....J?QI;.1.RlCVogan

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

9/y,/87~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

NRC FORM 3IS IIO/80I NRCM 0240 OFFICIAL RECORD COPY

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