L-84-276, Forwards Response to NRC 840815 Request for Addl Info Re Facility Safety Parameter Display Sys Implementation Plan,In Accordance W/Generic Ltr 82-33
| ML17346A572 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point, 05002580  |
| Issue date: | 10/04/1984 |
| From: | Williams J FLORIDA POWER & LIGHT CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| GL-82-33, L-84-276, NUDOCS 8410100345 | |
| Download: ML17346A572 (41) | |
Text
REGULATORYIPORNATION DISTRIBUTION SYEN (BIDS) l,~
ACCESSION NBR:8410100345 DOC ~ DATE: 84/10/00 NOTARIZED0 NO FACIl:50-250 Tur key Point Pl ant E
Un) t 3P F l orida Power and Light C
50-251 Turkey Point P)anti Unit Qi Florida Power and Light C
AUTH,NAME" AUTHOR AFFILIATION HILLIAMSiJ ~ N ~
Florida Power L Light Co, RECIP ~ NAME RECIPIENT AFFILIATION EISENHUTiDSG ~
Division of Licensing DOCKET 05000250 05000251
SUBJECT:
Forwards r esponse to NRC,.840815 request for addi, info re facility safety parameter display sys implementation plan in accordance w/Generic Ltr. 82 33.
DISTRIBUTION CODE:
A0030 COPIES RECEIVED:LTR E ENCL J SIZE: Al TITLE; OR/Licensing Submittal:
Suppl 1 to NUREG-0737(Generic Ltr 82 33)
NOTES! Ol:
07/19/72'L:04/1It/73 05000250 05000251 RECIPIENT ID CODE/NAME NRR ORB1 BC INTERNALI ADM/LFtlB NRR PAULSONgN NRR/DHFS/PSRB NRR/DL/ORBS NRR/DSI/ICSB NRR AB FILE RSS/EPRPB EXTERNAL: LPDR NSIC COPIES LTTR ENCL 7
7 1
0 1
1 1
1 1
1 1
1-1 1
1 1
1 1
1 REC IP IENT ID CODE/NAtlE IE/DEPER/EPB NRR/DHFS/HFEB NRR/DL/ORAB NRR/DSI/CP8 NRR/DSI/METB NRR/DS I/RSB RGN2 NRC PDR NTIS COPIES LTTR ENCL 3
3 5
5 1
1 1
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1 TOTAL NUMBER OF COPIES REQUIRED:
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j, FLORIDA POWER & LIGHTCOMPANY October 4, 1984 L-84-276 Office of Nuclear Reactor Regulation Attention: Mr. Darrell G. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Dear Mr. EisenhutI Re:
TURKEY POINT UNITS 3 & 4 DOCKET NOS.
50-250
& 50-251 SPDS IMPLEMENTATION PLAN AND PARAMETER SELECTION REPORT RE VEST FOR ADDITIONAL INFORMATION In our letter L'-84-114, FPL provided a
Safety Parameter Display System'SPDS)
Implementation Plan and Parameter Selection Report to NRC in accordance with Generic Letter No.
82-33.
In an NRC letter dated August 15, 1984 from Mr.
Steven A.
Varga of
- NRC, the staff requested additional information on'he Turkey Point SPDS.
The attachment to this letter provides the additional information requested.
Should you have any questions regarding this, submittal, please contact us.
Very truly yours,
~
~
~
.W. Williams, Jr.
Group Vice President Nuclear Energy JWW/TCG/DCB/mp cc: Mr. James P. O'Reilly, Region II Harold F. Reis, Esquire 841Q100345 8410Q4'DR ADOCK 05000258 OF
'DR PEOPLE... SERVING PEOPLE
RESPONSE TO THE NRC QUESTIONS ISOLATIONDEVICES General Two types of isolation devices are used for safety signal isolation for the Safety Parameter Display System (SPDS).
These are:
Anglo Isolators TEC model 980 series A through G (Attachment I describes the various input/output ranges of these isolators).
These are magnetically coupled isolators.
There are 4 isolators mounted on one card.
Di ital Isolators TEC model 98l A through D.
(Attachment I describes the input/ output ranges of these isolators).
These are optically coupled isolators.
There are 4 isolators mounted on one card.
Both the Model 980 and 98I isolators are placed in TEC model 2200 isolation system cabinets.
These cabinets have +l5Vdc power supplies.
IE field cables are connected to the IE side of the isolation cards.
The isolators non - IE output is connected to a connector box and to the mulitplexors located adjacent to the isolation cabinet.
The following paragraphs provide answers to the specific questions a) through f) as requested in the NRC correspondence to Florida Power & Light Co. (letter from Mr. Steven A. Varga, Chief Operating Reactors Branch
/PI to Mr. J.W.
Williams, Jr. Vice President, FPL dated Aug. I5, l984):
a)
The testing performed to demonstrate that the device was acceptable to accomplish electrical isolation was done using 2000 V dc.
This voltage was applied across the non-IE outputs during the seismic test.
The IE input side of the isolators (Figure I) was monitored to see that no breakdown has occurred.
Figure 2 shows the test configuration and the manner in which the maximum credible faults were applied.
The model 98I digital isolators were functionally tested for high and low output during the second SSE.
The output of the recorders during 2000 V dc test is shown in Fig. 3.
The chart shows that there was no effect on the isolator.
Digital isolators were also tested using the Fig. 2 arrangement by applying 2000 V dc.
Once again there was no effect on the input or class IE side of the isolator noted.
b)
Maximum credible fault is the maximum voltage/current that an isolator's non IE side would be exposed to.
At Turkey Point Plant TEC model 2200 cabinets are placed adjacent to the multiplexors and are electrically connected with each other by multiple pin connectors.
The connector cables approximately l5 ft. long are run
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under the cabinets.
Therefore, the maximum credible voltage that can be applied to the output is the power supply output voltage of + l5 Vdc.
Figure 2 provides the data that 2000 V dc was applied to the non-IE side.
This is far above the + I5 V dc required.
Since 2000 V dc was applied, the current flowing through the isolators is much greater than that at + I 5Vdc.
c)
Figure I "Diagram of On-Line Monitoring of Isolators page l6 from TEC test report 30 I 52-TR-02 and Figure 2 "Isolation Capabilities test of 2200 Isolation System" from TEC procedure number 30I52-DVTP-Ol show that the signals were applied to the TEC isolator devices in the transverse mode and open circuit mode.
It is also apparent from the block diagram of the analog and digital isolators (Figures 4 & 5) that any short on the output side would not pass through the opto isolator in the digital 98I isolators or the demodulator section of the analog 980 isolators.
d)
The pass/fail acceptance criteria is described in TEC report No.
30I52-TR-02 Revision I (Attachment 2).
A Honeywell absolute pressure transmitter was placed in operation as the analog input to the analog isolator and the IE inputs were recorded by a solid state strip chart recorder.
During the seismic event, 2000 V dc was applied continuously to the non-IE output of the isolators.
No transients were recorded on the IE input line nor was there any damage to the input or recording electronics.
e)
The TEC model 2200 isolation cabinets are located in the computer room of the Turkey Point Plant in a mild environment.
IO CFR 50.49 does not apply to devices located in a mild environment.
- However, cabinets were seismically tested and designed to insure operability in its intended environment.
f)
The TEC model 2200 isolation system uses differential inputs, high impedence amplifier inputs, steel cabinet shielding and shielded output cable to eliminate common mode, electrostatic coupling, EMI and cross talk problems.
J
HUMANFACTORS PROGRAM DISPLAY SYSTEM DESCRIPTION The SPDS provides a centralized, flexible, computer-based data analysis and display system to assist control room personnel in evaluating the safety status of the plant and detecting possible abnormal operating conditions.
This assistance is accomplished by providing graphical displays containing a minimum set of parameters representative of the plant safety status for three modes of plant operation (NORMAL, HEATUP/COOLDOWN, and COLD SHUTDOWN).
(The set of parameters has previously been submitted to the NRC by Florida Power &
Light Company in a letter from Mr. J.W. Williams to Mr. D.G. Eisenhut dated May I, l984.)
The information is presented to the Control room operator on a medium resolution, multi-color cathode ray-tube (CRT) dedicated to the SPDS.
Attachment 3 provides the specific display formats for the three modes of operation.
The displays consist of bar graphs, trending graphs, message
- areas, targets, and digital values for the various parameters monitored.
In addition, on two of the three high level displays an Accident Identification Display System (AIDS) is provided.
AIDS is not considered a part of the SPDS and no credit is taken for any of the parameters monitored and displayed exclusively on AIDS.
However, since AIDS bars will be available to the operators on the primary CRT, the following provisions will be made to ensure that AIDS will not compromise the intended function and use of the SPDS.
The software providing parameter status information via AIDS bar indicators and associated displays will be subject to the same validation testing requirements as the SPDS software.
AIDS will be subject to the same human factors design criteria as the SPDS.
Operator training will be conducted to insure that they understand the AIDS philosophy for use with the SPDS.
The availability of AIDS willnot impair or compromise the use of the SPDS.
The displays are selected from a dedicated function key pad conveniently located near the control board.
A I 9" CRT is located on the control board where it is easily visible to the Control Room Reactor operator and Senior Reactor Operator.
The SPDS CRT provides three top level displays.
These displays are for the following modes of operation:
I.
Normal Operation Display - Selected during plant conditions at or above normal operating pressure and temperature.
2.
Heatup/Cooldown Display Selected when RCS is intentionally cooled below normal operating values or is being heated up prior to startup.
3.
Cold Shutdown Display -
Selected to monitor Cold Shutdown plant conditions.
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These displays are configured so that the displayed information is readily perceived and comprehended and do not mislead the operator.
This was confirmed during a simulator evaluation of the SPDS.
A simulator evaluation of the SPDS showed the SPDS to be easily interpretable by team of operators not directly involved with the design.
HUMANFACTORS DESIGN A multiple disciplinary team of operators, instrumentation and control engineers, and human factor engineers from twelve (l2) utilities and Quadrex designed the displays for the SPDS.
The design of these displays are based upon the guidelines of NUREG 0696.
These displays were mocked up on a simulator and evaluated by a team of operators from various utilities at the Indian Point Plant.
An evaluation report prepared on the display at the simulator indicated that the overall SPDS design was well received by the end users (operators).
The display formats are designed with low information densities and include information required to support the task activity of the user.
Further, the color scheme is designed to reduce the visual dominance of the static background information.
Extensive use of demarcation lines is employed to separate classes of data or parameters.
Simple display formats are provided to reinforce user recognition of plant status.
Vertical bar level indications are easy to associate with parameter values or magnitudes of a parameter, as most control boards contain vertical meters.
A red (off-normal)/green (normal) color is used to fillthe vertical bars on top-level display.
As numerous alarms already exist in the control room, the use of alarms on the SPDS display system is kept to a minimum.
Arrangement consistency is an important factor in display design and is a feature of the SPDS displays.
Certain areas of data (date, time, display titles, message, etc.) always appear in the same area in related formats.
This is done to assist user identification of data appearing on multiple displays.
The data or information groups are located on the display by importance.
Generally, the groups are arranged in a top-to-bottom and left-to-right ranking, with the most important data at the top or on the left of the display.
Additionally, the message areas remain on primary CRT displays, to prompt the user that status change has occurred.
The quality of information being displayed to the user is also presented.
Should a caution exist concerning the validity of data, the numerical value is displayed in yellow rather than red (off-normal) or white.
If all sensors providing data for a parameter fail, or are taken out of scan, the digital value for the parameter is replaced by a yellow "FAIL".
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Extensive use of graphic symbology or presentations is used on the SPDS displays.
By using a 640 by 5I2 pixel colorgraphic CRT, symbol set, color and line clarity are achieved.
With the high resolution display and sharpness provided, high levels of object/background and object/object discrimination can be obtained.
Pattern and coding techniques are extensively used to portray status in a graphic form for rapid user recognition.
Bar.charts are selected as the means of presenting primary status indications for a range of value indication and a form comprehended by the user.
Minimum use of color combined with a simplified format for the CRT display is a key design'feature to aid both normal and off normal pattern recognition.
Color coding is used only to enhance changes in status, and to aid differentiation and association.
Color is used in a consistent and restrained manner (green is always used to portray normal or acceptable conditions).
Only seven colors plus a black background are used.
The use of color is backed up by a redundant code.
Status or information is obtainable should a color gun fail or an operator suffer from a visual color imbalance, by providing an alternate means (location, digital values, etc.) of gaining the same data.
The use of color employed a structured approach.
To present status information the following conventions are used:
Red - off-normal, immediate action, loss of function
~Oran e prompt action, potential loss of function Yellow - failure or caution (sensor related),
loss of redundancy, action may be needed Green - normal
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DATAVALIDATIONAND HOW INVALIDDATA IS DEFINED The displayed value of each SPDS parameter is determined by processing one or more plant signals.
Valid/invalid indications are provided for SPDS parameters and are determined through systematic consideration of the type and number of signals available for each parameter.
A displayed variable which consists of a single analog input signal is generally determined to be valid or invalid based only on a validation table comparison check of the high and Iow limits. If the data is out of range, the parameter is failed, and the digital value on the display is replaced by "fail'n yellow.
For two sensor inputs for a given parameter, both sensor input data are checked against the validation table limits. Three different situations can occur:
I.
One sensor is rejected in range checking.
The data for the remaining one sensor is taken as the parameter data.
Since only one sensor data is left, it is defined to be in an "Alert" condition and the parameter data is displayed in yellow.
2.
Both sensors are rejected in range checking.
The parameter will be displayed as a failed parameter, i.e., displayed "FAlL'nyellow.
3.
No sensor has been rejected.
The average or high/low as previously defined in the table of the two sensor's data will be displayed as the parameter data.
There is another test for the "Alert" condition for this situation.
If the two sensor data are spread too wide (i.e.
more than IO)%, it is considered an "Alert"condition.
For a number of sensor inputs greater than 2, the sensor inputs are checked against validation table range limits. If the unrejected sensors are less than 3, the data will be checked as described earlier for one or two sensor inputs.
If more than 2
sensors are left unrejected, the data will be verified using Chauvenet's criteria. Ifany of the data is rejected, the data willbe tested in the way described for one, two, and three sensor inputs depending on the number of unrejected inputs.
The test 'will be terminated if no data is rejected against Chauvenet's criteria.
Table I provides a summary of the data validation process.
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NUMBER OF SENSOR INPUTS RESULT Sensor out of ran e.
Sensor in range.
CONDITION FAIL O.K.
One sensor out of ran e
Two sensors out of ran e No sensor out of range and percent difference I 0%.
No sensor out of range and percent difference<
I 0%.
ALERT FAIL ALERT O.K.
One sensor left after rejection test.
ALERT Two sensors left after rejection test and rcent difference I 0%.
Two sensors left after rejection test and rcent difference ZI0%.
More than two sensors left after rejection test.
ALERT O.K.
O.K.
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ATTACHMENTI A~QD DRS Specifications I.
INPUT SIGNAL RANGE Model OUTPUT SIGNAL RANGE 980A 980B 980C 980D 980E 980F 980G
+ I OmV
+20mV
+ I 00m V
+I V
+IO V
+2 V
+5 V
+l0 V
+l0 V
+IO V
+IO V
+IO V
+IO V
+IO V I. INPUT SIGNAL RANGE DIGITALISOLATORS Specifications Model
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98I A Voltage Input 0-9 V ac rms 75-l50 V ac l.5 mA max.
98I8 Voltage Input 0-15 V dc 75-200 V dc I.S mA max.
98I C Voltage Input O-I.O V dc 2.5-50 V dc 2.5 mA max.
98I D+
Contact Sense 500 K~
0-IO k~
l.5 mA max.
+ For contact sense, the sense voltage (l5 V dc) is internally supplied by the module.
2 OUTPUT SIGNAL RANGE Output = "I": I 5 V + 5% in series with 430~(+5%)
Output = "0": 0.4 max. O I 6 mA max. sink current
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ATTACHMENT2 PERFORMANCE AND ACCEPTANCE CRITERIA The two criteria used to determine the performance and acceptability of the system were the variation between the pre-test data and the post-test data, and also the ability to maintain the acceptable range as defined in the "Quality Control Test Procedure" (QCTP).
Acceptable ranges of performance for the system devices were pre-determined and documented in the form of baseline data collected before the test program was started.
The post-production "Quality Control Test Procedure" (QCTP) data formed the baseline data for the thermal aging. The post-thermal aging functional test data then determined the baseline data for the pre-irradiation test.
The post-irradiation functional test was not a complete QCTP, but rather a spot-check to determine if the system was still operative prior to the seismic test.
The final QCTP test was conducted after the EMI test.
The isolation capability of the system was demonstrated online by applying 2000 volts dc to input of one channel of each of the 980, 98l, respectively.
The 2000 volts dc simulates the online worst-case isolation requirement for any known Design Basis Event (DBE).
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'BO Output 156 Output 981 Output 159(A) Output Figure 3.
Output of Recorders Durfng the 2000 Vdc Input Test.
(No Iso1atfon Breakdown) 0
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-l5 V DC TO DC CPHVKATKR pSCILlATPR GROUND Figure.+'lock Diagram of One Channe1 in TEC Hode1 960.
INPUTS TEST SVI.
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+15V OUTPUT TKST INPUTS L
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. 5 TEC Model 981 Block Diagram.
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