ML18046B414
| ML18046B414 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/30/1981 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML18046B415 | List: |
| References | |
| RTR-NUREG-0487, RTR-NUREG-487 NUDOCS 8107070403 | |
| Download: ML18046B414 (63) | |
Text
ENCLOSURE SEP TECHNICAL EVALUATION TOPIC VII-1.A Received wth ltr dtd 6/29/81
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TONR 27-81 5/18/81 EiICLEJSURE SEP* TECHNICAL-EVALUATION T0PIC*-VH.:..l.A "ELECTRICAL, INSTRUMENTATION AND CONTROL PORTIONS OF THE ISOLATION OF THE RPS FROM NON-SAFETY SYSTEMS, INCLUDING QUALIFICATION OF ISOLATION DEVICES"
- _REGUlATO.RV DOCKET FILE COPY,
- ENCLOSURE SEP TOPIC VII-1.A TABLE OF CONTENTS Descri"Otion
SUMMARY
OF THE SEP TECHNICAL EVALUATION l THE ACTUAL RPS/NON-SAFETY INDICATING SYSTEM INTERCONNECTION 2 CORRECTIONS TO THE SEP TECHNICAL EVALUATIONS 2 Correction 1 Analog Input Isolation Devices 2 Correction 2 - Computer Input Resistors 2 Correction 3 - RPS Out"Out Signals 3 Correction 4 - Neutron Flux Safety and Reactor Tri"O. 4 Signal Isolation Correction 5 - Operational Amnlifier Input Resistors 4 NONCOMPLIAJ.'fCE 5 JUSTIFICATION FOR NONCOMPLIAJ.'fCE 5 ADDITIONAL INFORMATION FOR THE INTEGRATED DBE REVIEW ~
Item #1 - Physical Location of Input Circuitry 5 Item #2 - Adequacy of Resistor and Operational .Amplifier 6 Resistive Isloation -Analog Innuts to Tennecomn 0 Resistive Isolation - Digital In"Outs to Tennecoinn 7 Operational Amplifier Isolation 7
SUMMARY
9 Isolation Between the RPS and the Plant Conrnuter 9 Isolation Between the RPS and the Data Logger 9 ATTACHMENT A - "RPS/Non-Safety Indicating System Interface", 1 Page Sketch #SK-VII-1.A ATTACID*IBilT B - References 2 Pages
EM CLOSURE SEP TECIDHCAL EVALUATION TOPIC VII-1.A "ELECTRICAL, nTSTRUI'1ENTATION AND CONTROL PORTIONS OF THE ISOLATION OF THE RPS FROM NON SAFETY SYSTEMS, INCLUDING QUALIFICATION OF ISOLATION DEVICES"
SUMMARY
OF THE SEP TECHNICAL EVALUATION The objective of the SEP Technical Evaluation was to verii"J that the non-safety systems which are electrically connected to the reactor protection system (RPS) are properly isolated from the RPS. In addition, the objective was to ensure that the isolating devices or techniques meet the current licensing criteria.
According to Section 2 of the SEP evaluation, the NRC utilized GDC-24 and IEEE 279-1971 as presented below for the current licensing criteria.
GDC 24, "Separation of Protection and Control Systems" The protection system shall be separated from control syste!llS to the extent that failure of any single control system component or channel, or failure or removal from service of any single protection system component or channel which is common to the control and protection systems leave intact a system that satisfies all reliability, redundancy, and independence re-quirements of the protection system. Interconnection of the protection and control systems shall be limited so as to assure that safety is not significantly impaired.
IEEE 279""-197, "Criteria for Protection Systems for Nuclear Power Genera.ting Stations" The transmission of signals from protection system equipment for control system use shall be through isolation devices which shall be classified as part of the protection system and shall meet all the requirements of this document. No credible fail~e a.t the output of an isolation device shall prevent the associated protection system channel from meeting the minimum performance requirements specified in the design bases.
Examples of credible failures include short circuits, open circuits, grounds, and the application of the maximum credible a-c or d-c potential. A failure in an isolation device is evaluated in the same manner as a failure of other equipment in the protection system
- 2 The NRC summarized its evaluation by stating that isolation devices are provided in the interconnections between the RPS and the computer and logging equipment as required by the current licensing criteria (as detailed above). The URC noted two exceptions, however, in that the RPS steam generator pressure (Channel B) and primary coolant flow (Channel A) inputs *to the computer are not isolated from the computer.
In addition, the NRC stated that a determination must be made as to whether the resistor isolation and operational amplifier isolation are adequate to satisfy the current licensing criteria.
THE ACTUAL RPS/NON-SAFETY INDICATING SYSTEM INTERCONNECTION Prior to describing the necessary corrections to the subject SEP Technical Evaluation, an overaJ.:l description of the RPS/non-safety syst~m interconnection and isolation is presented. The purpose of this description is to provide an accurate reference which enables the corrections to be described more clearly.
Attachment A schematically represents the RPS/non-safety system interconnection as it applies to signal indication. Attachment A not only lists the signals that interconnect the two systems, but also provides drawing references which describ.e the types of circuit isolation utilized. The actual isolation circuitry and its ability to provide adequate isolation is discussed in detail in the sections that follow.
CORRECTIONS TO THE SEP TECHNICAL EVALUATION Correction 1 - Analog Input Isolation Evaluation Section 5, Subsection l (Page 9) of the subject SEP Technical Evaluation describes the isolation between the RPS analog inputs (ie, steam generator pressure, primarJ coolant flow, steam generator water level, primary coolant outlet and inlet temperature and neutron flux safety) and the Tennecomp data logger as being l~ resistor isolation. (NOTE: The RPS analog inputs to the data logger are listed in Reference #1.)
In reality, the analog input isolation devices are positive temperature coef-ficient thermistors having a nominal resistance of lK ohms (see References 2 through 5). For all input signal ranges below 10 volts full scale, the input thermistors (RlO through R20) exhibit a resistance of l.Kn. Should the normal mode voltage on an input exceed 15 volts, however, zener diodes Dl and D2 will break dovn.allowing thermistor current to significantly increase.
This increasing current heats up the input thermistors and increases the ther:n.-
istor resistance well above lK..CI.. to limit the current to 6ma within 0.50 seconds.
Correction 2 - Computer Input Resistors Section 5, Subsection l (Page 9) of the subject SEP Technical Evaluation impiies that the isolation between certain RPS signals and the plant computer is achieved by lK.n. resistors. In reality, the computer utilizes lOOn.resistors as input devices (see References #6 and #7). The computer does not incorporate compon-ents for the specific purpose of input isolation.
3
- Also implied in Subsection 1 is the fact that all of the RPS signals listed (ie, steam generator pressure, primary coolant flow, steam generator water level, primary coolant inlet and outlet temperature and neutron flux safety) input to the plant computer. Only two of the listed RPS signals input to the computer; namely, steam generator pressure (Cha.~nel B) and primary coolant flow (Channel A) (see Reference #8).
A third signal from the RPS also inputs to the plant computer; namely, start-up rate. This signal not only utilizes the 100.ll. resistor at the input of the computer but also uses a buffer amplifier (operational amplifier) at the output of the nuclear measurements system for isolation purposes (see References #9 and
- 10).
Correction 3 - RPS Output Signals Section 5, Subsection 1 (Page 9) of the subject SEP Evaluation states that the following RPS output signals have the same.isolation device (namely, lK.n.resis-tors as stated regarding the RPS input signals) and input to the computer and the data logger. This statement is incorrect for the following reasons:
3.a) The neutron flux safety signals do not input to the plant computer. They input to the Tennecomp data logger only and input to positive temperature coefficient resistors as described in Correction l. It should be noted that the neutron flux safety signal is considered an RPS input (from the Nuclear Measurements System) and is not considered an RPS output.
3.b) The reactor trip signals do not input to the plant computer.
Reactor trip signals input to the Tenneco:mp data logger onl.y. These signals are digital in nature in that a.
field contact closure inputs into the data logger. Digital inputs such as these input to voltage sense cards in the input conditioning circuits of the data logger (see Ref-erences #11 and #12)-. The voltage sense cards employ 36K!1.,
3W resistors as input devices. In addition, optical iso-lators are used for isolation purposes *.
3.c) The five reactor trip final outputs to the Tennecomp data logger all are contact closures from the control rod drive clutch power reley-s. These outputs are:
a.) "Reactor Control Rod Drive Clutch Power Relay K-1 (De-energized)",
b) "Reactor Control Rod Drive Clutch Power Relay K-2 (De-energized)",
c) "Reactor Control Rod Drive Clutch Power Relay K-3 (De-energized)",
d) "Reactor Control Rod Drive Clutch Power Relay K-4 (De-energized)" and e) "Reactor Trip" (from power Relay K-3).
All of the above RPS outputs are the result of any one of the RPS inputs (as listed in Attachment A) which might be in such a condition as to represent an unacceptable plant parameter value (see References #13 and #14) *
- 3.d) In addition to the five RPS contact closure final outputs listed in Item 3.c, other RPS contact closure outputs also feed into the Tennecomp data logger (see Reference
- 13 and Attachment A). These additional RPS outuuts originate from RPS output bista.bles a.nd input to the Tennecomp voltage sense input circuitry as described in Item 3. b.
Correction 4 - Neutron Flux Safety and Reactor Trin Signal Isolation Section 5, Subsection 2 (Page 10) of the subject SEP Technical Evaluation states the following: "Tennecomp Systems drawing number 161-002812 (Reference
- 5) shows that isolation is achieved by the optical isolator (4N35), thermistor and resistors. The following RPS signals have this typ_e of isolation a.nd input to the computer and the data logger:
- a) neutron flux safety channels (A through D),
b) reactor trip (Channels A through D from thermal margin, steam genera.tor pressure, steam genera.tor water level, reactor coolant flow, high flux, clutch power de-energized and pressurizer pressure-high)."
The *above Subsection 2 statement is incorrect for the reasons given below:
l) As described in Correction 3.a, the neutron flwe safety signals do not input to the com1Jtiter. These signals input to the data logger only utilizing an isolation scheme as identified in Correction 1.
- 2) As described in Correction 3.b, the reactor trip signals do not input to the computer; they input to the data. logger only.
- As described, they input to a voltage sense input isolation/conditioning circuit which utilizes 36KJ'l. resistors a.nd optical isolators for overload and isolation, respectively (see Reference 12). The drawing referenced in the SEP evaluation (namely, 161-002812) is for resistance sensing input circuitry and does not ap~ly to the listed RPS signals.
As a result of the reasons stated above, the last paragraph of Subsection 2 does not apply. This para.graph describes the current limit charact-eristics for the resistance sense input conditioning circuit in the status subsystem of the Tennecomp data. logger. Of the tvo RPS signals identified (namely, neut~on nu:<: safety and reactor trip), only reactor trip is digital in nature and utilizes the voltage sense input condition-ing circuit.
Correction ; - Ooerational Amnlifier Input Resistors Section;, Subsection 3 (Page ll) of the subject SEP Technical Evaluation states that the power range safety signals that go to the recorder, remote meter and au:dlia.ry circuits are isolated by operational amplifiers with 10...n..resistors at the inverting and non-inverting inputs. In reality, these input resistors a.re of lOK ..n.. (see Reference 9).
5 NONCOMPLIA.i.'l'CE Isolation devices are provided in the interconnections between the RPS and the Tennecomp data logger as required by the current licensing criteria as detailed in Section 2 of the subject SEP Technical Evaluation. The only area of non-compliance is the interconnection between the RPS and the plant computer.
Although 100~ resistors are installed in each input of the Fischer & Porter computer, these resistors were not installed specifically for the purposes of isolation.
JUSTIFICATIO:N" FOR NONCOMPLIAfICE Although specific isolation devices were not installed between the RPS and the plant computer, calculations have shown that the postulated, most severe, credible failure in the computer has minimal effect in the RPS. Reference #15 postulates the most severe, credible failure in the plant computer to be in the multiplexer such that two inputs would be "tied" together. The analysis of the failed circuit, which is part of Reference #15, calculates the current through the RPS loop to be 9.97ma during the failed condition. As the analysis indicates, the effect on the RPS is minimal since prior to the failure, the loop current was lOma. The analysis states that the Darlington amplifier (located in the sensor transmitter) will quickly readjust to lOma since the 9.97ma current also passes through the amplifier's feedback coil. It should be noted that this analysis (ie, validity of input variables, failed circuit model and methods of calculation) was independently reviewed and determined acceptable.
Although the analysis of the most severe, credible accident reveals an insigni-ficant effect on the RPS, it is recommended that specific isolation devices and circuitry (perhaps similar to that employed in the Tennecomp data logger) be installed. As in the case of the analog and digital signals to the data logger, this circuitry would prevent less credible accidents such as voltage surges and overloads from affecting the RPS.
ADDITIONAL INFORMATION FOR THE INTEGRATED DBE REVIEW' Item #1 - Physical Location of Input Circuitry According to Paragraph #1, Page 10 of the subject SEP Technical Evaluation, the physical location of the input isolation circuitry for the pla..~t computer and the data logger could not be determined from the documents listed as References #5 through #14 of the NRC report. The following two paragraphs serve to identify the location of the input isolation circuitrJ for the computer and the data logger.
The input isolation circuitrJ for the Tennecomp data logger is located in the field remote station (FRS). 3oth analog and digital plant signals arrive at input conditioning cards located in the FRS intra-cabinet assembly (see rtef-erence #16). T!le FRS is located in the plant's feedwater purity roan.
':'he input isolation circuitry for the Fischer & Porter plant computer is located in the computer's central cabinet logic card frame. Reference #17 describes
- the plant signals entering the computer at input multiplexer circuit cards located in the central cabinet. The central cabinet is located in the plant's control room.
6 Item #2 - Adequacy of Resistor and Operational-Amplifier Isolation According to the Summary section of the subject SEP evaluation (Section 6, Paragraph 2, Page 13), determination must be made as to whether the resistive isolation and operational amplifier isolation are adequate to satisfy the NRC criteria as given in Section 2 of the NRC report. Although the SEP evaluation recommends that this subject be addressed in the integrated DBE review, it is presented below as part of this review.
Resistive Isolation - Analog Innuts to Tennecomn As described in Correction 1, the analog signals to the Tennecomp data logger input to positive temperature coefficient thermistors Rl and R2 each having a nominal resistance of 1x103 ohms (see References #2 through, #5). These thermistors provide protection against high voltage surges and overloads. For all input signal ranges below 10 volts full scale (all RPS analog inputs to the Tennecomp are within a range of 0-10 volts), the thermistors exhibit a resis-tance of lK Ohms. Should the normal mode voltage on a.n input exceed 15 volts, zener diodes Dl and D2 (located on the data logger side of the input thermistors) will break down. Upon zener break.down, the input current through the thermistors increases significantly. This sharp increase in current magnitude rapidly heats the thermistors such that their resistance increases to limit innut current to 6ma within 0.50 seconds. Since the RPS current loops normally c~rry currents up to 50ma, an additional load of 6ma in the failed condition would not appre-ciably load the RPS loop power supply. The RPS loop power supply is typically rated at 6oma.
According to Reference #15, the postulated, most severe, credible failure of the data logger that could effect the RPS is a failure in the data logger's input multiplexer such that two or more inputs would be "tied" together. This failure could occur when the machine samples an input and does not "release" prior to sampling another input which results in one input feeding into the other. As the Reference #15 analysis shows, the current through the RPS loop becomes 11.lma during the failed condition. Since this current is not signi-ficantly greater than the assumed lOma pre-failure loop current, the effect on the RPS is minimal. T'nis current change is easily accounted for by the RPS transmitter's Darlington amplifier and output feedback coil since the loop fault current passes through the feedback network.
The Reference #18 analysis also considers a fault whereby a 0-120 volt analog innut is "tied" to a 0-lOV RPS analog input. The analysis reveals that a current of-9.85ma flows through the RPS loop in this faulted condition. According to the analysis, the effect on the RPS loop i~ minimal since this current is not significantly different from the assumed lOma pre-failure current. The small difference is readily compensated for by the RPS transmitter's Darlington amplifier and feedback loop.
It should be noted that an independent review of the Reference #15 analysis was performed which checked the input variables to the analysis, the failed circuit model and the failed current comnutations. The review indicated that the Reference #15 analysis was acceptable .
T Another feasible failure, although less credible than tying two inputs together at the data logger's multiplexer, would be a short in the input capacitor (eg, Capacitor Cl of input Channell; see reference #4). This failure could result from a breakdown in the component's dielectric medium and would tie together input thermistors RlO and Rll. T.i.e series combination of RlO and Rll would effectively be in parallel with the RPS loop dropping resistor. Since the ohmic sum of RlO and Rll (lK ohms + lK o::ims; nominally) is at least twenty times greater than the ohmic value of the RPS dropping resistor (RRPs = 100 ohms),
the additional loads on the RPS loop would be insignificant.
Failure of the isolating devices themselves (ie, thermistors and zener diodes) such as opens, shorts or grounds is unlikely since they are placed on printed circuit cards located in the field remote station intra-cabinet assembly. In addition, cardboard strips are placed between the thermistors and the circuit card to prevent excessive heat transfer to the card during overload conditions (see Reference #16).
Resistive Isolation - Digital Innuts to Tennecomn As described in Correction 3b, the digital inputs to the data logger arrive at voltage sense cards for signal conditioning a.nd isolation. As is shown in References #11 and #12, the voltage sense circuitI"J consists of 36K Oh!!lS input resistors and optical isolators to provide protection from voltage surges and overloads. As is described in the above references, the 36K ohm resistors are rated to handle overload conditions. The optical isolator provides physical separation between the input conditioning circuitz-J and the data logging system microprocessor. In addition, the lK ohm and the 1N4005 diode serve to protect the optical isolator input from excessive forward or reverse currents.
The effect of Tennecomp data logger failures on the RPS in considered practically nonexistent since two means of physical isolation exist between the data logger and the RPS. As previously mentioned, an optical isolator is located in the data logger input circuitry to provide isolation. In addition, all of the RPS digital inputs that feed into the data logger are contact-closure types of input. Therefore, a second means of physical isolation is provided by the RPS output relay.
It should also be noted that the possibility of failures of the data logger input isolating devices (ie, 36K ohm input resistors and optical isolator) such as opens, shorts or grounds is considered remote since they are mounted on printed circuit cards. These cards are located in the field remote station intra-cabinet assembly. In addition, cardboard strips are placed between the resistors and the circuit cards to prevent excessive heat transfer to the card during overload conditions (see Reference #16).
Ouerational Amplifier Isolation As stated in the subject SEP eva.luation, the signals that originate from the power rate safety channel drawer assembly and go to the recorder, remote meter and auxiliary circuits are isolated by AT09C operational amplifiers.
This statement includes the neutron flux safety signals that enter the Tennecomp data logger (refer to Attachment A). In addition, the start-up rate signals
- that go to the Fischer & Porter plant computer are also isolated by AT09C operational amplifiers. These signals originate from the start-up and inter:ned-iate range logarithmic channels. In the case of the neutron flux safety signals, the operational amplifiers perform a back-up isolating failure. Once the signal passes through the amplifier, it is further isolated as previously described in the "Resistive Isolation - Analog Inputs to Tennecomp" section of this review.
3 The A709C operational amplifiers provide an adequate means of isolation for both the neutron safety signals to the Tennecomp data logger and the start-up rate signals to the plant computer. This amplifier typically employs a lOK ohm resistor at the inverting and noninverting input (see References 18-21).
These resistors attenuate the incoming signal by 50% to ensure that the common mode voltage limit of the operational amplifier is not exceeded. Diodes CRl and CR3 are connected across the two inputs to ensure that the maximum differential mode voltage could be only one diode's forward voltage drop of about 0.6 volts. Diode CR2 and zener diode VRl ensure that the common mode voltage cannot exceed about 7.0 volts at either input to the operational am:plifier.
The feedback resistor network is composed of Rl and R6 (both of which are typ-ically lOK ohms). These resistors set the amplifier gain such taht the 50%
attenuation at the input is exactly offset to provide overall unity gain.
Tne amplifier's ability to isolate becomes apparent when it is considered that a typical operational amplifier is characterized by an input resistance which approaches infinity. In Figure #1 below, the Gulf General Atomic operational amplifier is shown. Figure #2 reconstructs the circuit showing the A709C operational amplifier as an ideal device in accordance with Reference #22.
FIGURE 1 lOK.f"'..
lOK.n..
O.lOa Output
'-4---r, lOK.n.
Input FIGURE 2 lOK.t1.
- - - - -Rout -1 lOK!l 1 Out-put
~ .n.. I lOK.r:.._ _ _ _ _R in Input01-----'\NVV-
= 00 J f Ideal Op I Amp Equiv l
- Ckt_1
9 As can. be seen in Figure #2, effective isolation is provided by the amplifier's infinite input resistance and by the amplifier output diodes and 0.10 ampere fuse. Normally, the output diodes are reversed biased and contribute negligible loading to the amplifier. If, however, an output fault tries to drive the amplifier output more than 15 volts from ground in either direction, one of the power diodes will turn on conducting sufficient current directly from the power supply lines to blow the ouput fuse and disconnect the faulted external circuit. The 220J1. output resistor prevents amplifier damage due to an output ground.
SUNMARY Isolation Between the RPS and the Plant Comnuter Although analysis shows minimal effect on the RPS due to the postulated most severe credible failure of "tying" two inputs together at the multiplexer, additional isolation circuitrJ needs to be installed. This circuitry should be similar to that utilized in the data logger to prevent less credible faults from affecting the RPS.
Isolation Between the RPS and the Data Logger The circuit isolation utilized meets the current licensing criteria in that the effects of both the postulated most severe, credible fault of "tying" together two RPS inputs and less credible faults (ie, opens, shorts or grounds) at the output of the isolating devices is limited so as to assure that safety is not significantly impaired .
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- ENCLOSURE SEP TOPIC VII-1.A ATTACHMENT B References Reference # Reference Descrintion
- 1. Bechtel Drawing #E-53,Sheets 21 and 22 (attached).
- 2. Tennecomp Systems, Inc. Manual Number 201-000309, "Technical Information and Instruction Manual for the
- Data Logger System", Volume II, Part 7, Pages 7-8 and 7-9 (attached).
- 3. Tennecamp Systems, Inc Drawing #161-002815-000, Sheet 1 (attached) *
- 4. Tennecomp Systems, Inc Drawing #114-002815-000, Sheet 1 (attached) *
- 5. Tennecomp Systems, Inc Drawing #141-002815-000, Sheet 1 (attached) .
- I" o.
7, Fischer & Porter Co Instruction Manual for the Series 3000 Data System far Consumers Power Company F&P Serial Numbers 6804A5648P & 6804A5649P, Rev 2 dated 12/14/79.
Section 4.2.8 11 MW.tiplexer" (attached).
Fischer & Porter Co Drawing #SC30-1545 (attached).
- 8. Bechtel Drawing #E-297 (attached).
- 9. Gulf General Atomic Drawings #ELJ157-0010 and ELJ147-1121 (attached).
- 10. Bechtel Drawing #E-61, Sneet 2 (attached).
- 11. Tennecomp Systems, Inc Manual Number 201-000309, "Technical Information and Instruction Manual for the Data Logger System", Vol II, Part 7, Pages T-4 and 7-5
( attached) *
- 12. Tennecomp, Inc Drawing #161-002811-000, Sneet l (attached).
- 13. Bechtel Drawings #E**53, Sheets 1,4,7,10 and 13 (attached.).
- 14. Combustion Engineering Drawing #2966-E-2850 (attached).
Page 2 of 2
}~eference # Reference Descri2tion
- 15. Letter: RMMarusich to Dan MacDonald (USNRC) "Personal Correspondence SEP Topic VII-1.A", MA.RU 10-79 (attached).
- 16. For analog input to Tennecomp, see attached Tennecomp Syste!llS, Inc Drawings:
114-002815-000 l4l-002815-000 113-002815-001 104-002803-000 102-002803-000 For digital input to Tennecomp, see attached Tennecomp Systems, Inc Drawings:
161-002811-000 l4l-003023-0XX ll3-002811-003 l04-002803-000 102-002803-000
- 17. Fischer & Porter Co Instruction Manual for the Series 3000 Data System for Consumers Power Company F&P Serial Numbers 6804A5648P and 6804A5649P, Rev 2 dated 12/14/79, Pages 1-41, 42 and 43, Drawing MS 30-1082 (attached).
l8. Gulf General Atomic, Inc Instruction Manual "Dual
- 19.
20.
Linear Power Channel Model NP-6", Serial Number 102, 103, 104, 105, 106 and 107, Page 8 (attached).
Gulr General Atomic Drawing #KLJ 147-1121 (attached).
Gulr General Atomic Drawing #ELJ 147-0010.
2l. Gulr General Atomic Drawing #ELJ 157-0010 (attached).
- 22. "Electronic Devices and Circuit Theory", Robert Boylestad and Louis Nashelsky, Copyright 1972 by Prentice Hall, Inc, Englewood Cliffs, NJ.
~~
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ENCLOSURE SEP TOPIC VII~l.A Reference #2 Page 1 of 2 7.4 ANALOG SUBSYSTEM ~
7.4.l General JitJ*
Analog inputs to the Field Remote Station are conditioned, converted to digital values, and compared with appropriate alarm limits by several pieces of equipment in the field remote station cabinet.
The input connectors are wired directly to terminals of signal con-*
ditioning cards in panels Fl~ and Fll. T~e conditioning card provides protection against high voltage surges and overloads. It also provides relays which disconnect the field input wires from the input to the analog-to-digital converter (ADC) and substitute a precis.ion
- ADC calibration voltage. Each analog inp~t signal leaves the con-ditioning card at the edge connector and is carried through a shielded twisted pajr to a relay multiplexer input card in the ADC chassis, panel F12. The multiplexer card has a low pass RC filter for each input signal and relays to connect the signal to the commdn ADC input bus.
The ADC is controlled by the microcomputer system, panel F9, through an interface which permits the microcomputer to select an input signal for conversion and the amplifier gain to be used. The microcomputer receives a digital value for the selected channel in binary code.
This value is compared in the microcomputer with binary limit values previously transmitted from the CCS. If .the input value is out of limits, the FRS advises the CCS over the serial communication lines.
If the selected anal-0g input channel has been assigned to a PRE/POST history group; its binary value is stored in core memory by the microcomputer. An analog input may have its binary value returned to the CCS over the serial communication lines if it is a member of a logging group or if a printout of its value has been requested.
7.4.2 Detailed Description 7.4.2.1 . Signal Conditioning Signal conditioning cards for up to 60 customer channels are contained in panel Fll, drawing 113-002815-001. The first card position is used to hold 4 channels required for thermocouple referencing and permanent calibration. See BRATION" section.
If more than 60 customer channels are requfred, a second conditioning crate is installed in panel FlO.
It is the purpose of the signal conditioning card to provide protection to the ADC from overloads which may be applied to input wiring.
A second function of the conditioning card is to provide signal sub-stitution calibration of eac:h ADC channel. The conditioning circuitry is best understood on Tennecomp drawing 161-002815-000. For all input signal ranges below 10 volts full scale, Rl and R2 are lK (nominal) positive temperature coefficient thermistors. R3 is not used. The
.01 mf capacitor filters high frequency transients. Dl and 02 are zener diodes which break down if the normal mode voltage an an input 7-8
ENCLOSURE ..
SEP TOPIC _y~~~l.A Reference 2 Page 2 of 2 exceeds 1SV. If the zeners breakdown, the input current through Rl and R2 becomes very high. This current heats the thermistors and within 1/2. second their resistance increases to 1imit the current to 6 ma.
The ADC can accept common mode voltages of up to 200V. Should the common mode voltage exceed 200V, bipolar zener Zl will break down through Dl and/or D2, limiting the common mode seen by the ADC to 200 volts. Rl and R2 again act to limit current.
The relay shown is used to swtich the ADC input from the field input to a calibration voltage.
7.4.2.2 Detailed Conditioning Circuitry - 10 volts or less full scale Actual circuitry used on ali conditioning cards for lOV full scale or less is shown on schematic 114-002815-000. Component 1oca tion and values are shown on 141-002815-000. The first sheet of logic shows input circuitry similar to 161-002815-000. Rl2, RlS, Rl8, and R21 correspond to R3 and are omitted. R6-R9 are omitted as these would be required only for sensing current inputs.
Sheet 2 of the logic diagram shows the elements required to support calibration and gain assignment. This logic is connected to the micro-computer through an analog conditioning interface (see information on panel F9). The four channels connected to any one card must be of the same input range. Rl through RS are 0.1% resistors selected to provide a voltage 90% of full scale when lOV is applied between CALSIG and CALCOM. Jumpers 11 P11 are installed, as is W2. W2 selects calibration for one analog panel at one time. For additional details of. calibration see 11 CALIBRATION 11
- Jumpers W4-W7 are selectively installed (as shown on 141-002815-000) to provide the appropriate ADC gain code for the input signal range assigned to the card. The microcomputer reads this gain code through its analog conditioning interface and sends this code to the ADC through its inter-face. This technique permits input ranges to be changed for*any four-channel group on one conditioning card by replacing the conditioning card with one for the desired new range. No changes in the microcomputer program are required ta accommodate the input range change.
7.4.2.3 Detailed Conditioning Circuitry - 120V input The voltage attenuator shown on 161-002815-000 for the 120-volt range was reconfigured to achieve proper operation with the ADC. R2 was replaced with a fuse which opens on overloads applied to the 11 low 11 input terminal. Rl and R3 form a 100:1 divider. All other components.
perform as on the lower voltage boards.
Details of the 120V conditioning logic are shown on drawing 114-002856-000 and physical component location is shown on 141-002856-000. Sheet l of 141-002856-000 shows input circuitry. RlO and Rll correspond to Rl on 161-002815-000, Rl2 corresponds to R3, and the network forms a 100:1 divider. This ratio requires an ADC range of 1.2 volts full scale, and the balance of the card is set up for that range. R6 through R9 are not used.
7-9
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ENCLOSURE SEP TOPIC VII-1.A Reference #6 4.2.8 Multiplexer The basic function of the Mu.ltiplexer is to program the p .. ess variable input signals to the measuring system and to provide an iden:. ~cation for each inpu.t poin_t.
Reference:
Schematic SC30-1542 SC30- l 545 The Multiplexer circuit card consists of ten relay channels. One side of all relays are common and connected to the output of one Source Driver Switch. The other side of each individual relay is independently connected to the outpu~ of an individual Typer Driver Switch for the sink drive circuit.
The relays have been specially selected for low level multiplexing opera-tion and generate a maximum of 7 microvolts of offset for 100% duty cycle.
Diode CR!, across the relay coil serves as arc suppression while diode CRZ in the "source driver" side of the relay is used for steering.
The relays contain 2 sets of form A contacts. These contacts are used for the positive and negative side of the input signal thru a filter network.
The input data is connected from the input terminal strips to these data contacts. The output of the data contacts are combined in groups of ten and are routed to the Analog-to-Digital Converter.
Thus, via the means of upper and lower driver control, the indi-vidual relays are en_ergized sequentially or selectively as the need de-mands. The relay coil is rated to _operate at 14 VDC; contact ratings
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7.3 STATUS SUBSYSTEM Page 1 of 2
~
7.3.1 General ~
Status inputs to the Field Remote Station are conditioned and co** :ted to logic levels which can be read by the microcomputer by two ty~ *.., of status conditioning cards. Each type of card provides for signa:
substitution verification through. the input optical isolators. ;;rotec-tion from high voltage surges and overloads is provided as well. Optical isolators separate input circuit ground from microcomputer logic ground.
Drawings relating to the status subsystem are listed in genealogy 102-002811-000.
7.3.2 Detailed Description The circuitry used for voltage sense inputs is shown on Drawing 161-002811-000 *. The 36K, 3 watt resistors are rated to handle the indicated overload conditions. The .01 capacitor filters high frequency transients. The lK resistor and 1N4005 diode protect the isolator input diode from excessive forward or reverse currents. The calibrate relay switches the isolator input to the 48V status excitation bus, but this circuit is completed only when the calibrate 11 1 11 relay is energized as well, allowing calibration of both 11 011 and 11 111 input conditions. -
Output of the isolator is converted to a logic signal using a hysteresis gate. Bounce of input signals is filtered digitally by the circuit described on 161-002814-000 .
- The next level of information is found on conditioning block diagram 136-003023-000 *. External clocking of the bounce filter is used. Timing for status scanning is covered in the microcomputer controller section under the Real Time Clock.
The actual physical conditioning assembly and detailed logic are found fr.om drawing 105-003023-000. Variation -002 is used for voltage sense.
This variation calls for main board 141-003023-002, with corresponding logic 114-003023-000, and calibration board 141-003024-000, with corresponding logic 114-003024-000. Careful study of sheets 1 and 2 of the main board logic and the calibration logic will verify the circuit snown on 161-002811-000 is repeated eight times. Sheet 3 of the main board logic diagram shows the address decoding circuitry used to selectively gate status information into the microcomputer. Data drivers are shown on sheets l and 2. Address assignment is determined by wiring on the signal conditioning crate, reference 120-001124-000.
7-4
ENCLOSURE SEP TOPIC VII-1.A Reference #11 il' 7.3.3 Detailed Description - Resistance Sense Page 2 of 2 The circuitry used for resistance sense inputs is shown on Drawir 161-002812-000; The lK positive temperature coefficient thermis~
heat up within 1/2 second upon over.loads up to 1000 volts and l *L.
fault current to 6 ma. The 3K, 3 watt resistors limit the sense current to 6 ma in normal operation. The .01 capacitor filters 1igh frequency transients. The 1N4005 protects the isolator input d1ude from reversed input polarity. Relays are used to disc.onnect the isolator input from field circuits and substitute current from the 48-volt excitation supply.
Following the isolator, the circuitry is identical to that used in voltage sense and the same description applies. Only circuit board designations vary. The assembly variation of 105-003023-000 is -001, calling for main board 141-003023-001 (logic 114-003023-000) and calibration board 141-003025-000 with logic 114-003025-000.
7.3.4 Wiring Field connections are made using 16-channel cables shown on 131-002808-000 (see Analog Subsystem Section). Internal wiring from the connectors to the conditioning cards is by cables 131-002810-000.
Cable assignment is tabulated below.
"FRSl J Panel Cards Notes 1 F4 1;2 2 F4 3,4 3 F4 5 Cable channels 9-16 spare 4 F4 6~7 5 F4 8,9 6 F4 10 Cable channels 9-16 spare 7 F4 11, 12 8 F4 13,14 9 F4 15 Cable channels 9-16 spare 10 F4 16 FS 1 11 FS 2,3 12 FS 4 Cable channels 9-16 spare 13 FS 5,6 14 FS 7,8 15 FS 9, 10 16 FS 11, 12 17 F5 13-14 18 F5 15 Cable channels 9-16 spare 19 F5 16 Cable channels 6-8 assigned to test and speciaL input F5 Channels 9-16 spare
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ENCLOSURE SEP TOPIC. VII-1.A Reference #15 Page l of 11 S~P Topic VII l.A TOI D.:i.n M.::i.cDon.'l.lcl, rmc/E:*:t 2~ti1li FROM: R M Marusich, Consumers Power Company MARU 10-79 During the presentation to the NRC on March 6, 1978 concerning the isolation of RPS in!)ut siG?;nals from non-safety signals, additional information concerning the isola.tion cf the Reactor Protection System inputs from failures in the plant computer was requested. The inforrnatior. requested and responses follow.
Attachment 1 was presented at the March 6 meeting and is attached here for background.
Not.e in the :following discussions the following definitions are used.
"Fischer Porter" - is the pla.nt ccmputer. This machine samples and records various an~loz inputs for use in proc.::ss :pa.r:?.:neter :nonitoring. Steam Generator Pressure Channel B ~.nd Reactor Coohnt Flow Chnn.."lcl A are thP. only RPS inputs to this system. Other inputs are Feedwater Temperature and Flew, Prima.z:r Pressure, Loop Temperatures and Delta-T~ Turbine Pressure, Steam Flow, Charging Flow, Neutron Power, Station Output and Incore Neutron Detectors.
"Tennecomp" - is the data logger. This machine accepts analog and digita.J.
inputs. It is used ~s a post trip events recorder. The RPS inputs to the da.ta logger are sho~m in Attachwent l and additional inputs a.re similar to the Fischer-Porter inputs. It was recently installed as a part of the Feedwater Purity ?!:edifications. It has several remote multiplex/ADC stations. Only the one containing RPS inputs/outputs is.discussed here.
- l. How is the input to the Tennecomp physically seperated?
Response: The RPS input to the Tennccomp consists of digital. signals (output from th~ bi-st~ble trip ~~it~) from all channels of es.ch reactor trip and analog sir.;na.ls from c!:.annels A th!"oueh :l of neutron flux safety channels and reactor coolant flow channel A, steam generator pressure channel A, and primary coolu.nt inlet and outlet te~perature ch~nncl A.
2 ENCLOSURE SEP TOPIC vrr~1.A Reference #15 Page 2 of 11 The dieitnl input from channel A of the HPS trips, enters the Tennecomp through connector Jl. Simile..r;L~ :the input from channel :a enters through connector JL~,
channel C through J7 and channel D throueh JlO. These connectors are on the left side of the Tennecomp. Fieure l (Drawing 105-002806) shows these connections.
Channels A throueh D of the neutron flux analog input enter through connector J21 and the other an.a.log input ~nters t~rough J22. These connectors are shown en 105-0028o6 and are on the right hand side of the Tennecornp.
- 2. What is the most severe failure with res-pect to its aff~ct on the RPS current loops which can occur in the Tennecomp and Fischer-Porter?
Response: The most severe credible failuxe unique to the computers would be a failure in the machine multiplexer such that 2 or more inputs would be "tied" together resulting in one input feeding into another input. *This could occur when the ma.chine samples an input and does not "release" prior to sampling another input (Hung Mux Relay).
- 3. What is the effect on the RPS *inputs should this failure occur?
Response: F:!.scher-Porter _The i:iputs to the plant computer are described above.
All of these inputs are 850mv or less. Figure 2 (Fischer - Porter Drawing SC30-1545) shows a t'Y}?ica.l input circuit. The faiJ.ure described above could result in the configuration ~hown in Figure 3.
Figure 3 shows the configuration of the inputs should the failure described in Item 2 occur. A description of the 3 sections follow. '.!.'he top section shows the RPS current loop. El is the power supply which supplies 80v. R6 is an internal potentiometer which is adjusted so that the sum of the load resistances plus R6 = 600ohms. RS is the dro-pping resistor for the Fischer - Porter or Tennecomp. Next to it is the dropping resistor for the RPS trip units. E4 and R5 are the major portions of the forced balance pressure transmitter. E4 is a Zener diode which removes J.5v. R5 is a variable resistor used to mock up the effect of the DarlinGton J\mplifier in the transmitter. It attains a res~stance thit it forces the current output to be proportional to the deflection produced by the diar.hra:n. The botto'!l secti.on shows ~ t:;:iicn.l prccc.:::3 purn.meter measurer.lent loop. The description is the sume as for the RPS loop. R1. throur:h R4 are the rc::>istors within the machine.
ZiICLOSURE SEP TOPIC VII-1.A Reference #15 Page 3 of 11
- To analyze the effect of the failure the following assumptions are made:
- l. Plnnt ccnditi.c~s are such tho.t there is a lOma current within the RPS loop and 50ma in the process ~rameter loop.
- 2. The failure occurs so that R4 and R3 are connected and Rl and R2 are connected.
The values of the :parameters are:
R8 = 16ohms R6 = 600 - (16 + 100) = * .484ohms H5 achieves a resista.nce so that lOma. flows through loop
= 80 600 = 5900ohms O.Ol Rl through R4 = lOOolms R9 = 16ohms R7 = 600 - 16 = 584oh::iS R4 c.chieves a resistance so that 50ma flows throw;.'li loop
= 80 600 = 700ohms o.c:;;
The equations for this configuration are:
Sum of currents at A=O Il = I2 + I3 Sum of currents at B=O I +I =I 3 4 5 Sum of voltage drops around top section =0 80 - I R6 + I R8 + I 100 + I R5 - 15= 0 1 2 l l Sum of voltage drops around midclle section = 0 L R4 + I R3 -
l r R9 + I 1 I\2 + I l Rl - I 2 :18 =O
-i 4 Sum of voltage drops around bottom section= O*
80 + r R7 + I 4 ~9 +
5 I ~4 5 - 15 =0 These equo.ticns are .:olvcd ::or -1 T (the current across the fU'S trip unit dro-p!linG resistor) which is found to be 9,97ma. The effect of the failure is therefore minimal since prior to the failure the current was lOma and R5 (the DarlinGton) will quickly reo.djust it to 10.0ma. since the 9.97ma. would also be e;oing throush the fccdco.ck coil.
ENCLOSURE 4 SEP TOPIC VII-1. A Reference #15 :F' Page 4 of 11 Tenni::comn - An~lor: Inn*1ts
'l'he analog inputs are described above. Ficrure l~ shows the analog input to the Tennecomp. The failure described in Ite:n 2 could result in a configuration similar to the one shown in Figure 3. The only differences is that the values of' some of' the resistors are different. Using the same assumptions as previously an:d the following data changes, the configuration can be analyzed to obtain the effect on current I
- 1 Data changes:
IU throush R4 = lOOOohms R8 = lOOoh.."!lS R9 = 200ohms (used to simulate a 0-lOv input)
The analysis shows that r 1
= lLlma. a small change fror.i the i..'1.itia.l valve of lO:na and a change ~*hi ch can be easily made up in R5. Figure 4 also shows how the 10-120v inputs are accepted. It is possible to "tie" one of these inputs to a RPS current loop. The configuration after the failure which tied a l20v and RFS loop together*is shown in Figure 5. Analyzing this configuration to determine the change in :s_ shows that I = 9.85ma. after the failure vs lOma.
1 prior to the f~ilure. This is a minimal. effect and can easily be compensated by R5.
Tennecomu - Di~ital Irrouts The digital inputs, whi-=h in the case of the RPS inputs come from bistable trip unit output, are isolated by optical isolators (shown in Figure 6, Tennecomp drawing 161.-002811) and by the bistable trip units within the. RPS.
Therefore there is no effect on the RPS from the failure described in item 2.
~--
Elf CLOSURE SEP TOPIC VII-1.A Reference #15 Page 5 of' 11 Attachment l.
Ties To Com~uter The following RPS input.signals a.lso input to the.Tennecomp Drawing Tennecomp lJ.4-002815, 141-C028l.5 shows that isolation is a.chieYed by resistors:
Steam Generator Pressure Channel A only Primary Coolant Flow Channel A only Steam Generator Water Level Channel A only Prirea.ry Coolant Outlet Temp Channel A only Primary Coolant Inlet Temp Channel .~ only
?feutron F1..ux S~fetv Cha.nI1els A throuah D The following RFS output signals a.re also input to the data logger:
Neutron Flux Safety Channel A through D Reactor Trip Channels A through D from:
Thermal Margin Stea~ Generator Pressure Steam Generator Water Level Primary Coolant Flow High Flux Clutch Power De-energized Pressurizer Pressure (Hi)
BPS out-put shown on dra"1in~ E615 and in detail en 2966-E-2858 and 2st6-D-3l98 (Bistable Output Terminals W, X, Y). Tenne~omp drawing l61-0028J.2 zhcws that isolation is achieved by the optical isolator, thermistor and resistors.
The following RPS input signals also input to the. Fischer-Porter.
Steam Generator Pressure Channel B only Reactor Coolant Flow Channel A only
-~-
E~l'CLOSURE SEP ~-one VII-LA F:GURE 1 Reference #15 FRONT, SIDE AfID TOP VIEWS OF THE TENNECOMP Page 6 of 11
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ENCLOSURE SEP TOPIC VII-1.A FIGURE 3 Reference #15 Page 8 of 11 EFFl!:CT OF THE FAILURE DESCRIBED IN ITEM 2 p(es.:.~ <c-T{~ ~-~ i-kA..
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SEP TOPIC VII-1.A FIGURE.5 Reference #15 Page 10 of 11 CONFIGuRATION AFTER THE FAILURE DESCRIBED nT l
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SECTION 5 - SYSTEM LAYOUT Page 1 of 3
- 5. 0 Introduction The digital circuits described in previous sections are CC' ~ ;ned with certain analog circuits (amplifiers, scaling circuits, and A/~- .~onverter) to implement the system logic. The amplifiers and scaling c ~ :-cuits form an entity which is calied the computer (cons is ting of the Varian equipment).
The output of this chassis feeds the A/D converter and its output in turn feeds the digital logic. The digital logic not only processes the data gene-rated by the A/D but also controls the sequence of operations in the entire system. Figure 1-1 shows the inter-relationship of the System Logics.
5 .1 Logic Card Frame Layout Seven card racks are located within the Cabinet accessible by opening the front doors. One card rack is located within the Console accessible by opening the rear cover. The rows of cards are identified for convenience as Cabinet Bay 1 file A, B, C &: D, Cabinet Bay Z file A, B &: C, and Console file A. The files in Cabinet Bay 1 contain facilities for the insertion of tw~n ty printed circuit cards; the files in Cabinet Bay 2 and the Console contain facilities for the insertion of twenty-four printed circuit cards; the* rack slots are numbered from left to right. When removing or replacing cards, extreme care should be taken to avoid placing the card in the wrong slot.
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E1ICLOSURE SEP TOPIC VII-1.A Reference #17 Page 3 of 3
- 5. 2 Engineering Cross Reference F&:P BOARDS DATA SCAN BOARJ.
POWER DRIVER SC30-15 25 2-INPUT GATE DS201 CONT ACT INPUT SC30-1527 3-INPUT GATE DS202 TYPER DRIVER SC30-1528 4-INPUT GATE DS204 CONTACT OUTPUT SC30-1540 INVERTER DS206 SOURCE DRIVER SC30.,,1541 TOGGLE FLIP- ~-LOP DS212 MULTIPLEXER. SC3 0-1542 R-S FLIP-FLOP DS213 CONTACT OUTPUT SC30- l 543 ONE-SHOT DS214 MULTIPLEXER SC30-1545 GATED FLIP-FLOP DS226 CLOCK & RESISTOR SC30-1550 B-D CONVERTER DS244 CLOCK & RESISTOR SC30-1556 ONE-SHOT DS285 CLOCK & RESISTOR SC30-1557 CLOCK & RESISTOR SC30-1558 ADC ANALOG SC30-1582 ADC DIGITAL SC30-1583 ADC POWER SUPPLY SC30-1584 ADC BARRIER SC30-1585 POWER INVERTER SC30-1601 LEAKAGE RESIST.~\TCE SC30-1589 5 3 System Interconnections o
Refer to Diagram WD30-1248 for Customer Input Wiring Connections.
There are three logic cables used for the Computer - - Teletype, Interrupt and I/O Bus. The Teletype cable connects directly with the Teletype Unit.
The Interrupt and I/O Bus cables connect directly into the Cabinet Logic Frames A, Band C.
Each Logic Frame consists of 24 card slots numbered 1-24 from left to right. Each card slot has a forty-four pin connector; the pins are num-bered 1 thru 22 and A thru Z. A typical designation would be the following:
AS-7. This refers to Logic Frame A, Card 5, pin 7. As the logic draw-ings for the Console and Cabinet are separate and distinct, the same desig-nation applies in each case.
Note: All cables should be securely fastened without the use of tools (e.g., screwdrivers, pliers). ll~2S~49 Field Contact connections are fed to the Data System via connector J24.
From there, the connections are internally wired to the Cabinet Logic Frame C. The Ser. . sor in the multiplexer unit is connected to the Bridge and fed as a multiplexer input. Field multiplexer connections are fed to mounting brack-ets located in the multiplexer unit. Control logic for the multiplexer is fed from Cabinet Logic Frames A, B and C to the multiplexer units. The multi-plexed signal is fed directly from the multiplexer to the A/D.
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