ML20209G235
| ML20209G235 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/30/1986 |
| From: | Dorfman L EIGEN ENGINEERING, INC. |
| To: | |
| Shared Package | |
| ML20209G134 | List: |
| References | |
| SMD-1020-86-003, SMD-1020-86-3, TAC-56525, NUDOCS 8702050311 | |
| Download: ML20209G235 (14) | |
Text
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Preliminary Results of Central Control Unit Isolation Devices Test Sacramento Municipal Utility District Rancho Seco Plant Prepared By: -
kM Larrp S. dorfman
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1.0 INTRODUCTION
Rancho Seco 's, Saf ety; Par aseter Display, System. (SPDS)%,;%
.g . w. .; _ interfaces with the two SPDS computer and the plant' computer "
(IDAD) through the Central Control Unit (CCU) manuf actured by Anatec.
Eigen Engineering has been requested to qualify for Class .lE operation per IEEE Standard 384-1981, "IEEE Standard for Independence of Class lE Equipment and Circuits" f our po'ints of ele ct rical isolation between the non-cl a ss lE plant computer and the SPDS.
This letter summarizes the results of preliminary testing of the isolation devices.
2.0 ISOLATION DEVICES
! Table 1, Test Matrix, defines the circuit boards within the CCU that have points of isolation and the i solation Configurations A, B, C and D. Figure 1 provides the schematic for Configurations A and C (Configuration A is without a f use ) . Figure 2 and 3 provides the schematic for Configurations B and D, respectively. For the transf o rmer configuration, the entire circuit composed of fuse (Configurations B and C) transf o rm er and buffer amplifier
. (75110 or 7 5107) act as the isolator circuit- for separation -
- between the non-class lE and class lE systems. ,
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The fuse has characteristics of 1/16 ampere with 7 ohms I
resistance.
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3.0 TEST CONDITIONS r* ~s 'g g,gg,;,,~ Credible Volta'ge (MCV)"dhEer' mined to 6e 120'VAd, 20M ' Y "'
amperes was applied to the non-class lE side of each isolation device between each output terminal and ground.
The effect of the MCV applied to the non-lE side to the DC power supply on the lE side common to the entire CCU is of most concern. That is the DC power supply must not be shorted or DC level altered such that the circuits which pass SPDS signals to the SPDS computers are degraded.
Test signals to observe the effect of the MCV on the plus and minus 5 VDC power supply and the point of MCV application were monitored on a 4 channel strip chart. Tests to insure the circuits were operating normally were run prior to application of the MCV.
4.0 TEST RESULTS 4.1 TRANSFORMER ISOLATOR, CONFIGURATIONS A, B, AND C The tests results showed that Configurations B and C (with a fuse) blew the fuse instantaneously with no ef fects to the buff er amplifier, transformers, or DC power supply.
Configuration A (without fuse) shows the transformer and 100 ohms parallel resistor instantaneously- opened allowing a ---
l short pulse (400 mVolt, 6 millisecond duration) to pass -
power supply absorbs the pulse, without altering power level.
The buff er amplifier circuit was f ound non-f unctional after i the test with several of the internal components measuring
( essentially open circuit. - --
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4.2 OPTICAL ISOLATOR, CONFIGURATION D .
The optical isolator showed no indication of disturbance to the input for the MCV applied at the output.
The module was damaged and non-f unctional af ter the test. -
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Tabl e 1. Test Matrix tem Drawing Description
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EL6 00-313 9 CCU Procram I/O Card x x x x EL6 00-5115 CCU Sel ect Switch x x Puse Open Circuit Test Preliminary Oniv otes;
- Configuration A: Pulse Transformer - Dual Line Driver (75110)
B: Fuse - Pulse Transformer - Dual Line Receiver (75107 C: Fuse - Pulse Transformer - Dual Line Driver (75110)
D: Dual OPTO Isolator (MCT6)
- P - Preliminary Evaluation Test Q - Qualification Test i
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ATTACHMENT #5 Radioactivity Control To prevent or minimize radioactivity releases fran the plant, the control roon operator must be aware of the presence of high radioactivity throughout the plant ard monitor possible release paths. The SPDS provides radioactivity infonnation through displays and a radiation al e rt. Containnent radiation is presently displayed on the SPOS and there is a radiation alert if it exceeds 2R/HR. The following signals will be added to SPDS and displayed in uCi/sec or mR/HR, as appropriate, after restart modifications have been completed:
- 1. Reactor Building Stack R15044
- 2. Auxiliary Building Stack R15045
- 3. Radwaste Stack R15546A
- 4. Main Steam Line (Channel A or B) R15047 ard R15048 Each signal will be listed along with containnent radiation under the alphanumeric " Radiation" group to display engineering unit values ard will provide a radiation alert if any of the inputs exceed a predetennined setpoint.
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ATTCHM5(E3) . .
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ATTACHMENT #6 SPDS Upgrade Summary Report The SPDS at Rancho Seco will be modified as follows prior to restart:
- 1. Additional plant parameters to meet the requirenents of Regulatory Guide 1.97 Category 1 variables will be added to SPDS as follows:
- a. Redundant class 1E T h ot signals fran loops A (TE21033) ard B (TE21030).
- b. Redundant class 1E pressurizer tenperature signals TE21502A and TE215028 to provide temperature compensation to existing class 1E pressurizer levels. These signals will be used to tenperature compensate pressurizer levels fran LT-21503A, LT-215038 ard LT-21503C.
- c. EFIC class 1E steam generator pressures.
EFIC A fran PT20545A and PT20546A EFIC B from PT20545B ard PT20546B
- d. EFIC class 1E steam generator low range levels.
EFIC A from LT-20505A ard LT-20506A EFIC B from LT-20505B and LT-205068
- e. EFIC class 1E steam generator high range levels.
EFIC A fran LT-20507A and LT-20508A EFIC B fran LT-205078 and LT-20508B
- f. Additional class 1E Auxiliary Feedwater flow fran Loops A and B.
Loop A from FT-31802 Loop B fran FT-31903 This provides redundant signals to SPDS.
- g. Redundant class 1E Condensate Storage Tank levels.
LT-35809 (Channel A)
LT-35810 (Channel B)
- h. An additional Containnent Hydrogen Concentration signal fran AE-53812. This provides a redundant signal to SPDS.
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- 1. An additional Containnent Wide Range Pressure signal fran l PT-53622. This provides a redundant signal to SPDS.
- j. Remaining Regulatory Guide 1.97 category 1 variables except Reactor Coolant System Inventory and Neutron Flux were already j redundant class 1E inputs to SPDS and did not require any l
changes except for display changes.
ATTCHM6(E3) l l
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ATTACHMENT #6 (Continued)
- 2. Hardware changes to existing equipment will be accomplished as follows:
- a. Redundant class 1E power will be supplied to the Anatec Central Control Unit (CCU) cabinet. Power from battery / diesel backed distribution panel S1 A will be connected to the CCU #1 power supply.
Power fran battery / diesel backed distribution panel S182-1 will be connected to the CCU #2 power supply, the CCU Select Svitch (CSU) and the ca binet fa ns. ,
- b. The CCU cabinet will be re-arranged to alim for required electrical and physical separation between channels. Seismic qualification will be re-analyzed and re-tested as required. Isolation between channel A and channel B is provided by optical isolators in the CCU select switch and both CCU #1 and CCU #2. (Preliminary results attached.)
- c. Isolation devices from the CCUs to the Interim Data Acquisition and Display System will be tested for adequacy for maximum credible voltage fault (preliminary results attached). Any changes will be made as required to insure isolation,
- d. The Compudas data handler, presently installed in the SPDS cabinets, is a single point of failure in the SPDS systen and will be renoved and replaced by an additional equipment drawer. . This new equipment drawer and the existing equipment drawer will be re-designed and modified to allow each equipment drawer to connunicate directly with the channelized Anatec Central Control Units. That is, the channel A equipment drawer will be connected directly to the channel A (CCU #1)
Central Control Unit and the channel B equipment drawer will be connected directly to the channel B (CCU #2) Central Control Unit.
- e. Redundant class 1E power will be provided to the SPDS cabinet. Class 1E pwer fran battery / diesel backed distribution panel S1 A will be-provided to the channel A equipment drawer, channel A SPDS camputer and the channel A video generator. Class 1E power fran battery / diesel backed distribution panel S182-1 will be provided to the channel B equipment drawer, channel B SPDS canputer and the channel B video generator.
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- f. The SPDS cabinet will be rearranged to provide electrical and physical separation between channels. The supplier (B&W) will
- re-analyze and re-test the cabinet as necessary to show seismic qualification.
! g. The SPDS displays in cabinet H2SP will be replaced by seismically l
qualified video monitors. These monitors will be supplied, with qualification, prior to restart.
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ATTACMENT #6 (Continued) f
- h. The seismically qualified monitors will be pwered by class 1E pwer supplies. Class 1E power from battery / diesel backed distribution t
panel S1 A will be provided to the channel A monitor. Class lE pwer from battery / diesel backed distribution panel S182-1 will be_ provided F to the channel B monitor.
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- 1. New seismically qualified SPDS control panels will be installed in j place of existing control panels on the H1SS control console.- These control panels are improved to provide better operation and to meet human factors engineering requirenents.
[ j. Control cables from HISS console to the two SPDS computers will be routed in class 1 (channel A and channel B) cable trays and/or conduits.
4
- k. Video cables from the two video generators to the two SPDS monitors i
.will be routed in class 1 (channel A and channel B) cable trays .
! and/or conduits.
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- 1. Two redundant signal cables (data buses) will be routed in separate seismically qualified cable trays and/or conduits for each channel of i the Anatec Data Acquisition Systen. That is, each multiplexer throughout the systen will have two data buses providing identical J.
infonnation fran that multiplexer will be routed in separate class 1 cable trays and/or conduits.
i This unique and important feature of the Anatec systen provides very l dependable signal inputs to the SPDS by allwing both loop A and loop
- B sensor infonnation to be displayed on either SPDS monitor.
j m. Two data buses (one for channel A and one for channel B) will be
' routed in class 1 channelized cable trays and/or conduits fran multiplexer #1 (H4CDAR1) to the CCU cabinet. Channel A data bus will i be routed to channel A (CCU #1) of the CCU cabinet. Channel B data
I l n. Additional bus isolators will be installed in multiplexer #1 (H4CDAR1) to provide better channelization fran renote multiplexers.
i All renote data buses will tenninate in multiplexer #1 through l-appropriate bus isolators so that final channel A and channel B buses are protected against failure of individual multiplexers.
- o. Data buses fran multiplexers H4CDAR9 and H4CDAR10 (channel B in the NSEB) will be disconnected fran multiplexer H4CDAR8 and routed independently and separately to multiplexer H4CDARI. These two data -
buses will be routed in separate class 1 cable trays and/or conduits.
i ATTCHM6(E3) !
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ATTACHMENT #6 (Continued) 81
- p. The feed-thru bus isolators in multiplexer #8 (H4CDAR8) will be replaced by tenninating type bus isolators for proper impedance matchi ng.
The above hardware changes are shown in block diagram fonn in Attachnent
- 2 Figure 2-1.
- 3. To meet the Radioactivity Control requirenent of NUREG 0696, these new radiation monitoring inputs will be added to SPDS as follows:
R.B. Stack Effluent R-15044 A.B. Stack Effluent R-15045 Radwaste Area Effluent R-15546 A Main Steam Line A R-15047 Main Steam Line B R-15048 These signals will be added to Page 3 of the alphanumeric list and to the Radiation alert with existing Contairment Radiation sigrals.
- 4. To provide SPDS displays of parameters that are used to control the plant to hot shutdown and provide these independent of NNI AC or DC pwer, the following signals will be added to SPDS:
Reactor Coolant Systen TcA TE-21025C Reactor Coolant System Tc8 TE-21024C Make-up Tank Level LT-23502C RCP Seal Irdection Flow FT-23606A Let-Dwn Flow FT-22013A Make-up Flow FT-23603A
- 5. Software changes to the SPDS canputers will be made by Babcock & Wilcox to provide displays as described in attachnents #1 & #2. Final software design is not presently complete but will be available for evaluation during the February visit to Babcock & Wilcox. At that time, final versions of the new displays showing R.G.1.97 category 1 variables will be presented.
All R.G.1.97 category 1 variables will be presented on the Post Trip (AT0G) display in either graphical fonn or as an alert. All alerts will
! be shown on all displays and also all R.G.1.97 category 1 variables will
- be shwn on the alphanumeric list under its appropriate heading (Radiation, Pressure, Level, etc.)
Alphantsneric displays will consist of five (5) pages with variables listed under description headings. These five (5) pages will be individually selectable by its own select switch at the control panel instead of the current method of paging through by pressing one switch a multiple nisnber of times.
l ATTCHM6(E3) '
ATTACittENT #7 Stanmary of Control Room Modifications
- 1. Installation of EFIC controls and indication on HISS.
- 2. TBY controllers independent of ICS which provide manual control upon failure of ICS power to the nomal controller will be added.
- 3. Annunciator Changes Include:
- a. ICS and NNI Trouble and Failure Alams
- b. EMOV Actuation Alam
- c. IDADS Trouble Alam
- 4. ICS and NNI labels have been added for all indicators and reconfers '
which receive, signal or power from ICS or NNI.
k 6. OTSG A and B labels and color padding for OTSG isolation switches has been added to H2PS.
- 7. A reconfer will be added to H1CO which will trend parameters usually used to take the plant from hot shutdown to cold shutdown. All trended parameters will be independent of ICS/NNI signals and power.
The five reconfers on H1CO driven by the Bailey or Modcomp camputers 4 8.
will be replaced with a single 30 pen 6 color programmable reconfer.
- 9. The Auxiliary Steam Reducing Station on H2X will be modified to make the setpoint demand control independent of ICS pwer.
- 10. The SPDS control panels on HISS will be replaced with better human engineered control panels.
- 11. The nuclear service bus loading sequence indicators have been renoved from H2SF.
- 12. Controls for motor operators added to MFW isolation valves will be installed on H1RI
- 13. The SPDS is being upgraded to meet Regulatory Guide 1.97 Category 1 requirements, NUREG 06% requirenents for radiation monitoring and independence fran NNI for hot shutdown parameters.
- 14. The HPI f1w indication on H2SF will be made independent of NNI.
ATTCHM7(E3)
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