ML20100N414
| ML20100N414 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 10/31/1984 |
| From: | Cihi J, Slivinsky S GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML20100N394 | List: |
| References | |
| NUDOCS 8412130127 | |
| Download: ML20100N414 (43) | |
Text
{{#Wiki_filter:. 7-- g.' CC:! MON SENSOR FAILURE EVALUATION REPORT f[
, OCTOBER 1984 -
I 1 PREPARED i FOR GCLF STATES UTILITIES COMPANY 'I' RIVER BEND STATION k PREPARED 1 BY l t Dr. S. H. SLIVINSKY
! J. J. CIHI t
i GENERAL ELECTRIC COMPANY, HUCLEAR ENERGY BUSINESS OPERATIONS } San Jose, California 95125
- j i
i .} I l1 Approved: f. L N 0 A+4 M.'A. Smith, Manager - Regulatory Compliance Engineering 2 . Nuclear Control and Instrumentation Product Design Operation C C Fc J W E. C. Eckert, Manager - Plant Transient Performance Engineering Nuclear Power Systems Engineering Department
)
C. L. Tul , Licensing Engineer Safety and Licensing operation ! 11-0704
- 84121gO27e41121 gDRAyK05000 ,
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1 1 . - - e s . 1 0* 1* COMMON SENSOR FAILURE EVALUATION REPORT FOR GULF STATES UTILITIES COMPANY 1 RIVER BEND STATION
) ~i . ; 1.0 PURPOSE i The purpose of this evaluacion report is to address the following NRC , concerns:
Perform an analysis to confirm that Final Safety Analysis Report
! Chapter 15 analyses bound any occurrence that could result from I the failure of a single common instrument line.
1 A. DEFINITION i
- 1. . A conunon instrument line is defined as a line having two or
! more sensors, each of which belongs to a different system l or a 11: having one or more sensors, one of which sends
- ' signals -
two different control systems. For instance, one senso. could belong to the Feedwater Control System, another to the Nuclear Boiler Process Instrumentation System. f
} 2. A line is also analyzed when it is not directly covered by Definition 1.A.1 but still serves as a variable or refer- } ence leg for a differential pressure or level transmit- , ter(s) when the other leg is a common instrument line.
2.0 CONCLUSION
S This report, which supplements existing FSAR Chapter 15 transient analyses, documents an evalution of the River Bend Station for comunon i sensor failures. No new transients have been identified as a result j of this study. All the analyzed consequences of common instrument failures are bounded by the River Bend FSAR Chapter 15 analyses. I 3.0 ANALYSIS METHODOLOGY h - A comprehensive approach was developed by General Electric Company (GE) to analyze control systems that may affect reactor pressure vessel (RPV) water level, pressure or power. This report is a part of the total effort to answer River Bend FSAR Question 421.005 and l utilizes the list of applicable control systems in Section 3.1 3 determined by the Control Systems Failures Evaluation Report. 4 The common sensors failure analysis was conducted in the following manner by GE* and Stone and Webster Engineering Corporation (SWEC): i i f
- Additional GE technical contributors: R. E. Schroeder and L. E. Stapleton h
1 11-0704 (1)
}
"l .. l- 'l i ACTIVITY ASSIGNED TO SECTION } l
- Identify Common Sensors CE & SWEC 3.1
)
l
- Determine Failure Modes 3 ,
GE & SWEC 3.2
- Tabulate Common Sensor Failures l GE & SWEC 3.3 & 4.1 f
- Analyze Combined Effects Per 'GE & SWEC 3.4 & 4.0
, Common Instrument Lines
- Compare Results to Chapter 15 GE 3.5 & 4.0
- Analyze Additional Transients GE 3.6
,
- Modify / Augment Chapter 15 if GE 3.7 Necessary 3.1 IDENTIFY COMMON SENSORS The scope of systems to be analyzed was established by first com-piling a complete list of River Bend plant systems and subsystems.
j The list was reviewed to confine the analysis to only those systems t with the potential to affect reactor pressure, water level, or power.
'i I
In order to ensure that all necessary systems were considered, specific elimination criteria were established as a basis for not I
', analyzing systems further (see Appendix B). If there was any uncer-tainty as to whether or not a system met the criteria, it was re-tained for further. analysis. Those systems that met the criteria for elimination were removed from the complete system list to produce the e " final list of systems for analysis. A further elimination of systems was obtained by analyzing only those systems with instrument lines , containing sensors associated with two or more systems. This final
.j list of systems to be reviewed by GE and SWEC follows: 4 4l P h t , 2-i 4 4 i 11-0704 (2) t t L .
; ' e' n System Designators Systems t
- ) B21 Nuclear Boiler Process Instrumentation 2 B33 Reactor Recirculation / Jet Pump Instrumentation
.( C11 Ccntrol Rod Drive / Reactor Manual Control .
- ) C33 Feedwater Control
-l C51 Neutron Monitoring
! C85 Steam Bypass and Pressure Regulation
; D17 Process Radiation Monitoring
,; E31 Leak Detection and Isolation
., G33 Reactor Water Cleanup
) N64 Offgas Control '
't ARC Condenser Air Removal j -
CCP Reactor Plant Component Cooling Water CCS Tt.rbine Plant Component Cooling Water
,; CNM Condensate
'i BCS Bearing Cooling Water CRS Cold Reheat
, HRS Hot Reheat CWS Circulating Water DET Turbine Building Equipment Drains DER Reactor Building Equipment Drains
- DSM Moisture Separator Vents and Drains
.DSR Moisture Separator RHTR Vents and Drains
{ DTM Turbine Building Miscellaneous Drains 1 ESS Extraction Steam
, WL FDW Pump 4 Drive Lube Oil
, WR FDW Pump Recirculation L), FWS Feedwater GML Generator Leads Cooling
;) GMC Generator Stator Cooling Water
'+
GMH Generator H2 and CO2 Purge I HDH High-Pressure FDW Heater Drain HDL Low-Pressure FDV Heater Drain l SAS Service Air ] IAS Instrument Air J4 GMO Generator Seal Oil MSS Main Steam i
- SVH FDW Heater Relief Drains and Vents
] SWP Service Water
'. TMA Turbine Trips TMB Turbine Generator E.H. Fluid System TME Turbine Generator Gland Seal and Exhaust TML Turbine Generator Lube Oil
} THR Turbine Unit Runback
,, TMS Turbine Generator Exhaust Hood Spray q
'j NOTE: All non-numeric, letter designated systems are Stone &
i, Webster designatf.ons.
.)
i The control systems which can affect reactor parameters, as deter-mined by the Control Systems Failures Evaluation Report, were analyzed for multiple system sensors or multiple system contacts from i j'
! 11-0704 (3)
J
'I l -
4.- g , b i
- 6 1 a common instrument line. Instrument lines which serve only one sensor of one control system were eliminated because their failure effects are bounded by the current FSAR Chapter 15 analysis.
M i DETERMINE FAILURE MODES i The bounding failures for an instrument line were designated as an instantaneous break or plug in a line during normal, full power operating conditions. y A broken line to a pressure transducer results in a sensed low
- pressure reading (close to atmospheric). A broken reference line to ,
t - a differential pressure transducer used as a water level sensor k results in an indicated high water level (reduced differential pressure). A broken " variable leg" line results in an indicated low water level (increased differential pressure). j Plugged lines are conservatively considered to be 100% plugged or pinched, causing sensors to be inaccurate under changing pressure ] conditions. In the case of differential pressure transmitters, used
- to sense water level changes, a plugged reference or variable line a results in a more complex response than that resulting from a broken l line, as described in the following paragraph.
; Pressure fluctuations of about 9 psi have been measured in operating i reactors under normal, full power operation. These pressure varia-tions are sensed on both the variable and reference sides of the I differential pressure instruments which sense water level, and do not
- affect the water level reading. In the event of a plugged line, the 4 change in pressure is sensed on only one side of the differential 1 pressure diaphragm. The response of the instrument will depend upon
- i when the line is assumed to have been plugged in the pressure fluctu-
[ ation cycle, since the response will be different if the plug occurs ,; at the maximum or minimum point on the pressure fluctuation curve. A I pressure variation of 9 psi translates into a sensed water , level
, change of about 21 feet. In analyzing possible instrument responses, 1 the plugging of the instrument line was postulated at the maximum and
{ minimum points on the pressure variation curve. Assuming the extreme i conditions, a plugged reference leg could result in the instrument
;
- indicating a low water level and actuating all low' water level trips when the level has in fact remained constant. A plugged variable leg i could result in the instrument indicating a high water level and l actuating all high water level trips when the level has remained
- constant. The instrument responses are listed in Table 4.1 under the 1 column labeled SECONDARY EFFECT.
j, The PRIMARY EFFECT is defined as the effect a broken or plugged line i has on the specific sensor being analyzed. The sensed pressure or ] q differential pressure signal goes to a maximum or minimum value or remains at a constant (inaccurate) reading in the case of a broken i line. A range of responses is possible in the case of a plugged line. A ' The SECONDARY EFFECT is the effect due to sensing an incorrect pressure or water level on trips, permissives, interlocks and scram 4 .i i 11-0704 (4)
1.. . a s-x 1 i signals. These may be inappropriately actuated or rendered inopera-
- j. tive/ inhibited for the particular instrument being evaluated.
i i Combined effects (See Section 4.0) are those combined interactions of the various failed instruments on a given line which could impact RPV water level, pressure, or power. - j' 3.3 TA3ULATE COMMON SENSOR FAILURES i -{' Common Sensor Failures for given instrument lines are deberibed in j Appendix A tables. Described in the tables are: (1) system identi-J fication, (2) the common sensors, (3) failure type, (4) the primary 'i effect of either a broken or plugged line upon that sensor, (5) the , secondary effect on systems' instrumentation and logic, and (6) the effect on RPV water level, pressure, or power due to an erroneous signal from an affected instrument. 3.4 ANALYZE COMBINED EFFECTS PER COMMON INSTRUMENT LINE .s a This step combined all of the. individual effects for each instrument 9 op a given line. The interaction of each effect relative to the
..ther was evaluated and the combined effect consequences, if any, O were determined. The results are described for each line in Sec-
]t tion 4 3, " Common Sensors Results and Chapter 15 Comparison." j 3.5 COMPARE RESULTS TO CHAPTER 15 j The combined effects, as discussed in Section 4.0, were compared to
! the existing FSAR Chapter 15 analyses to determine if any new tran-j sient was possible which is not bounded by the existing analyses.
!! 3.6 ANALYZE ADDITIONAL TRANSIENTS 3 No additional transients were identified. f 3.7 MODIFY / AUGMENT CHAPTER 15 IF NECESSARY This step was not necessary in the River Bend Station analysis. j: , 4.0 COMMON SENSOR
SUMMARY
RESULTS AND CHAPTER 15 COMPARISONS INSTRUMENT LINE LINE FAILURE CONSEQUENCES
#1* A break in this line will cause a reduction in reactor water recirculation flow to about 25% of j full rated speed for recirculation pump A and . trip of pump B. Reactor power will be reduced.
j The consequences of a break in this line are-1 bounded by the consequences of the two Reactor j Recirculation Pump Trip event considered in the j Chapter 15 analysis.
~
[ ,
*See Appendix A for line number designations.
k j 11-0704 (5) l ~
y, y * , j .. ., ,. i j-A broken water level sensor line on feedwater control channel "A" would result in an alarm in
! the control room. If feedwater is being con- ] trolled on channel "A" and the operator ignor'es 3 the alarm, continued control on channel "A" could 4
'j possibly lead to a low water level scram. The consequences of this transient are bounded by the j consequences of the Loss of Feedwater Flow event considered in the Chapter 15 analysis.
; A plugged sensor line could result in the water ,
1evel sensor on feedwater control channel "A" indicating levels beyond the range of the associ-ated ' recorder. This will result in an alarm in the control room. Continued control on chan-j nel "A" could possibly lead to a water level 4 actuated scram (either high or low). The conse-4 quences of this transient are bounded by the consequences of the Loss of Feedwater Flow event considered in the Chapter 15 analysis. i
! #2 Similar to instrument line #1.
2 2 #3 A break in this line would have no effect on RPV .g .- water level, pressure, or power. ] A plugged' sensor line could possibly result in an inadvertant HPCS startup, as analyzed in the I. 1 Chapter 15 analysis. } #4 Similar to instrument line #3. [i #5 None 1 1 .(. 65 A break in this line would cause increased feed-j water flow if feedwater control is on chan-
} nel "A". An- alarm in control room will be 1 actuated. Continued control on channel A could j~ ' possibly le'ad to a high water level turbine trip } and subsequent reactor scram. The consequences of thin transient are bounded by the consequences 4 of the Feedwater Controller Failure-Maximum 1; Demand event in the Chapter 15 analysis.
l 3 , A plugged line would result in consequences
,. similar to that described for instrument line fl.
i
- j. #7 >None s
j #8 Similar to instrument line #6.
#9 None _
', 's
#10
- - None i'
ll 0704 (6)
,t.;- ;i
3.. , - D 4
#11 Similar to instrument line #3.
#12 None
.c 2 #13 Similar to instrument if ne #3. 7 ~
. #14 None U #15 None
#16 None f( #17 None
- l. . #18 None
'l j #19 None
#20 A break or a plug in this line could result in a slight. loss of feedwater heating. The conse-quences of this event are bounded by the conse-
, quences of the Loss of Feedwater Heating event in
- the Chapter 15 analysis.
j' #21 Similar to instrument line #20. l } #22 Similar to instrument line #20.
#23 Similar to instrument line #20.
1 #24 Similar to instrument line #20.
- i #25 Similar to instrument-line #20. -
li _ #26 Similar to instrument line #20.
.I J #27 Similar to instrument line #20.
l i-ll ,
#26 A break or a plug in this line could result in the isolation of one string of feedwater heaters.
This would cause a reduction in feedwater inlet 1: h temperature, a turbine runback, and recirculation pump runback. The consequences of this event are
, bounded by the consequences of the Loss of l Feedwater Heating event in the Chapter 15
!., analysis. Ib U #29 Similar to instrument line #28. R '4 l
#30 Similar to instrument line #20.
l, #31 Similar to instrument line #20. _ 4 { 11-0704 (7) a i, . L
m ~ - m ; ,7 APPENDIX A M RIVER BEND COMMON SENSOR FAILURE e FAILURE TYPE COTt0N TAP (BROKEN OR SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT EFFECT ON RPV WATER LEVEL. SECONDARY EFFECT PRESSURE OR PohT.R NUCLEAR BOILER B21-N080A BROKEN MAXIMUM DIFFERENTIAL WATER LEVEL 8 SCRAM SIGNAL CHANNEL A. NONE PRESSURE SIGNAL (HIGH WATER LEVEL 3 SCRAM AND IS0!ATION WATER LEVEL) SIGNAL CHAWEL A INOPERATIVE. PLUGGED INACCURATE DIFFERENTIAL POSSIBLE WATER LEVEL 3 SCRAM AND NONE PRESSURE SIGNAL (POSSIBLE ISOLATION SIGNAL CHANNEL A. ~ LOW WATER LEVEL SIGNAL) B21-N081A BROKEN MAXIMUM DIFFERENTIAL HALF OF WATER LEVEL 1 MSIV ISOLATION NONE PRESSURE SIGNAL (HIGH INOPERATIVE, HALF OF WATER LEVEL 2 WATER LEVEL) ISOLATION SIGNAL INOPERATIVE. PLUGGED INACCURATE DIFFERENTIAL POSSIBLE WATER LEVEL 1 MSIV ISOLATION NONE PRESSURE SIGNAL (POSSIBLE (DIVISION 1) AND WATER LEVEL 2 LOW WATER LEVEL SIGNAL) ISOLATION CHANNEL A. B21-N091A BROKEN MAXIMUM DIFFERENTIAL RHR A. LPCS AND PARTIAL ADS INITIA- NONE AND PRESSURE SIGNAL (HIGH TION INOPERATIVE. ;IVISION 1 RCIC B21-N091E WATER LEVEL) INITIATION INOPERATIVE. HALF RCIC HIGH WATER LEVEL TURBINE TRIP. PLUGGED IhACCURATE DIFFERENTIAL POSSIBLE RHR A. LPCS, AND PARTIAL ADS NONE FRESSURE SIGNAL (POSSIBLE INITIATION. DIVISION 1 RCIC LOW WATER LEVEL SIGNAL) INITIATION. B21-5095A BROKEN MAXIEM DIFFERENTIAL PARTIAL ADS A WATER IIVEL 3 INITIA- NONE PRESSURE SIGNAL (HICH TION SIGNAL INOPERATIVE. WATER LEVEL) PLUGGED INACCURATE DIFFERENTIAL POSSIBLE PARTIAL ADS A WATER LEVEL 3 NONE PRESSURE SIGNAL (PCSSIBLE INITIATION SIGNAL. LOW WATER LEVEL SIGNAL) B21-N099A BROKEN MAXIEM DIFFERENTIAL TWO OLT OF FOUR RECIRC A AND B NONE AND PRESSURE SIGNAL (HIGH LEVEL 2 PUMP TRIPS INOPERATIVE. B21-N099E WATER LEVEL) PLUGGED INACCURATE DIFFERENTIAL POSSIBLE. INITIATION OF TWO Otfr OF NONE PRESSURE SIGNAL (POSSIBM FOUR RECIRC A AND 8 IIVEL 2 PUMP IDW WATER LEVEL SIGNAL) TRIPS. INSTRUMENT LINE 1 PAGE 1 OF 3 REFERENCE IZG CONDENSING CHAMBER B21-D004A 12-1521:s (A-1) l
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-2 i e
APPENDIX A
"<J RIVER BEND COMMON SENSOR FAILURE I
FAILURE TYPE COMMON TAP (BROKEN OR SYSTEM ID SENSOR MPL EFFECT ON RPV WATER LEVEL, PLUGGED) PRIMARY EFFECT SECONDAkt EFFEC 7 PRESSURE OR POWER FEEDWATER C33-N004A BROKEN MAXIMUM DIFFERENTIAL C33-R606A WATER LEVEL INDICATOR FALSE CONTINUED CONTROL ON CHANNEL A WOULD PRESSURE SIGNAL (HIGH HIGH READING. DECREASED FEEDWATER RESULT IN LOWERED VESSEL WATER LEVEL, WATER LEVEL) FLOW. HALF MAIN TURBINE AND RFP POSSIBLE SCRAM. OPERATOR WULD HAVE MOTOR TRIP ON HIGH WATER LEVEL. TO IGNORE ANNUNCIATOR ALARM. ANNUNCIATOR AIARM IN CONTROL ROOM. PLUGGED INACCURATE DIFFERENTIAL C33-R606A WATER LEVEL INDICATOR AT WATER LEVEL COULD FLUCTUATE BEYOND PRESSURE SIGNAL (WATER INACCURATE READING. REACTOR TEED- RANGE OF RECORDER. ANNUNCIATOR WILL LEVEL) EATER ERROR IN LEVEL FOLLOWING. ALARM IN CONTROL ROOM. NUCLEAR BOILER B21-N058A BROKEN MINIMUM PRESSURE SIGNAL IWO OUT OF FOUR HIGH PRESSURE TRIPS NONE AND FOR RECIRC PUMPS A AND B DISABLED. B21-N058E PLUGGED CONSTANT PRESSURE SIGNAL TWO OUT OF FOUR HIGH PRESSURE TRIPS NONE FOR RECIRC PUMPS A AND B DISABLED. < B21-N062A BROKEN MINIMUM PRESSURE SIGNAL PRESSURE RECORDER R623A INDICATES NONE MINIMUM PRESSURE. PLUGGED CONSTANT PRESSURE SIGNAL PRESSURE RECORDER R623A INDICATES NONE CONSTANT PRESSURE.
- B21-N068A BROKEN MINIMUM PRESSURE SIGNAL FRESSURE TRANSMITTERS PART OF LOW-LOW NONE AND SET RELIEF FUNCTION OF SAFETY / RELIEF B21-N068E PLUGGED CONSTANT PRESSURE SIGNAL lALVES. SYSTEM IS SAFETY GRADE AND SINGLE FAILURE PROOF, BACKED UP BY REDUNDANT SENSORS.
B21-N078A BROKEN
- MINIMUM PRESSURE SIGNAL HIGH RPV PRESSURE SCRAM SICNAL ON Oh1 NONE CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MANUAL OPENING OF RRR ,
VALVES. PLUGGED CONSTANT PRESSURE SIGNAL HICH RPV PRESSURE SCRAM SIGNAL ON ONE NONE CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MANUAL OPENING OF RHR VALVES INOPERATIVE. INSTRUIENT LINE I PAGE 2 OF 3 REFERENCE LEG CONDENSING CHAMBER 521-D004A 12-15210 (A-2)
+' ( %*
+
APPENDIK A *
, RIVER BEND COMMON SENSOR FAILURE FAILURE TYI'E COMMON TAP (BROKEN OR EFFECT ON RPV WATER LEVEL, STSTEM ID SENSOR MPL PLUGCED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER FEEDWATER C33-N005 BROKEN MINIMUM PRESSURE SIGNAL HIGH PRESSURE ALARM (K636) INOPERA- REDUCED RECIRC PUMP FIhW, REACTOR TIVE, PRESSURE INDICATOR (R605) AT POWER REDUCED. WATER LEVEL MINIMLH PRESSURE. THERMAL LIMIT INCREASES.
INTERLOCK WILL TRIP RECIRC PUMP B. PLUGCED CONSTANT PRESSURE SIGNAL HIGH PRESSURE ALAPM (K636) INOPERA- NONE TIVE, PRESSURE INDICATOR (R605) AT CONSTANT PRESSURE. THERMAL LIMIT INTERLOCK FOR RECIRC PLMP B INOPERATIVE. C33-N008A BROKEN MINIMLH PRESSURE SIGNAL PRESSURE RECORDER (R609) WILL INDI- RECIRC PLMP A OPERATION REDUCED TO CATE 850 PSIG REACTOR PRESSURE. 251 0F FULL RATED SPEED. REACTOR SIGNAL SENT TO REACTOR RECIRC. POWER IS REDUCED, WATER LEVEL SYSTEM CAVITATION INTERLOCK. RECIRC INCREASES. PUMP A RUNBACK TO LIMG SET OPERATION. PLUGGED CONSTANT PRESSURE SIGNAL PRESSURE RECORDER (R609) WILL INDI- NONE CATE CONSTANT REACTOR PRESSURE. SIGNAL TO REACTOR RECIRC SYSTEM CAVI-TATION INTERLOCK INOPERATIVE. BACKED - 3Y C33-N0088. INSTRUMENT LINE I PAGE 3 0F 3 REFERENCE LEC CONDENSING CHAMBER B21-D004A 12-152I s (A-3) t
,, ? : ; 3
.._ _ _ - _ _ . . . , _ _ _ . . _ . _ , - . _,. - _ . _._ .4 _.
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t -l ~ y t' , 1] ? . , ': p ' P , {_} ;
, 4 4 -
' ~
' APPENDIX A.- * '
s j JN _ RIVER BEND Coltt0K SENSOR FAILIBE' '
, C g:' 4-
!- FAILL1tE TYPE ' 13 ! ! CateION TAP (BROKEN OR 1 . STSTEM ID SENSOR IWL
' EFFECT ON RPV WATER LEVEL,< ,4 PLUGGED) PRIIIARY EFFECT SECONDARY EFitCT ERESSLBE OR PORR i' NUCLEAR 30!M R B21-NOBOB l'
BRORN - HAXIltat DIFFERENTIAL _ WATER LEVEL 8 SCatAll SIGNAL CNAIREL B - NOK L
. PRESSURE SIGNAL (NIGN
~
WATER LEVEL 3 SCRAN AND ISOLATICII ' W
- - WATER LEVEL)- SIGIIAL CNANNEL B INOPERATIVE.
i i PLUGGED INACCURATE DIFFERENTIAL
! - POSSIBLE WATER LEVEL 3 SCRAN - - NOR s PRESSURE SIGNAL (POSSIBLE -(DIVISION 2) AND ISOLATION SIGNAL '
l 4 < LOW WATER LEVEL SIGNAL) CHANNEL B. i j B21-N0815 BROKEN MAXIMUN DIFFERFNTIAL'
- HALF OF WATER LEVEL 1 MSIV ISOIATION ' NOIIE i
PRESSURE SIGNAL (NIGN INOPERATIVE. IIALF OF WATER LEVEL 2 iWATER LEVE;) ISOLATION SIGNAL INOPERATIVE. l " 2 PLUGGED INACCURATE DIFFERENTIAL j POSSIBM NALF OF WATER LEVEL 1 MSIV MONE .
- PRESSURE SIGNAL (POSSIBM ISOLATICII (DIVISION 2), WATER MVEL 2 j
LOW WATER IIVEL SIGNAL) ISOLATION CHAIREL B. *
! B21-N091B BROKEN MAXIMUlf DIFFERENTIAL ' RNR B, RHR C AND PARTIAL ADS INITIA- NOIE 4
AND FItESSURE SIGNAL (MIGN
.321-N091F TIOII INOPERATIVE. DIVISION 2 RCIC WATER LEVEL) INITIATION INOPLAATIVE. NALF RCIC j NIGH WATER LEVEL TURBINE TRIP.
j PLUGGED INACCURATE DIFFERENTIAL POSSILLE RNR B, RNR L. AND PARTIAL IIGIE e ! PRESSimE SIGalAL (POSSIBIS ADS INITIATION. DIVISION 2 Rcic j LOW WATER MVEL SIGNAL) INITIATION. { B21-N0958 BROKEN MAXIMutt DIETERENTIAL i . PARTIAL ADS B WATER LEVEL 3 INITIA- NOME PRESSURE EIGNAL (MIGN TION SIGNAL IIIOPERATIVE. j WATER MVEL) PLEGGED INACCURATE DIFFERENTIAL j POSSIBLE PARTIAL ADS B WATER LEVEL 3 NONE
.PRESSURL SIGNAL (POSSIBLE INITIATIOh.
i
- LOW WATER LEVEL SIGilAL) I
} B21-N0995 BROKEN MAXI!fUtt DIFFERENTIAL i TWO OUT OF FOUR Rrt:IRC A AND 8 IsollE AND PRESSURE SIGNAL (MIGN LEVEL 2 Ptr !!!IPS INOPERATIVE. } B21-N099F WATER LEVEL) t PLUGGED INACCtRATE DIFFERENTIAL . POSSIBM INITIATION OF TWO OUT OF NOIE ' i PRES $tmE SIGNAL (POSSIBM ' FOUR RECIRC A Am B MVEL 2 PtBN. i 1 IAW WAIER 12 VEL SIGIIAL) TRIPS. i I I INSTRIBENT LIM 2 l PadE 1 0F 3 RERMBCE MG COWENSING reman 321-3B045 12-1521:e (g.4} , - lf kif$fk . E l $
_ . _ . . . . ~ . . _ __
- b APPENDIX A
. 'j RIVER BEND COMMON SENSOR FAILURE a
FAILURE TYPE C0!et0N TAP (BROKEN OR EFFECT ON RPV WATER IAVEL, SYSTEM ID SENSOR MPL PLUGGED) FRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER i FEEDWATER C33-N0048 BROEN MAXIMUM DIFFERENTIAL C33-R6068 WATER LEVEL INDICATOR FALSE CONTINUE CONTROL ON CHANNEL B WOULD PRESSURE SIGNAL (HIGH HIGH READING. DECREASED FEEDWATER RESULT IN IDWERED VESSEL WATER IIVEL, f WATER LEVEL) FLOW. HALF MAIN TURBINE AND RFP POSSIBLE SCRAM. OPERATOR WOULD HAVE MOTOR TRIP ON HIGH WATER LEVEL. TO IGNORE ANNUNCIATOR ALARM. ANNUNCIATOR ALARM IN CONTROL ROOM.
- PLUGGED INACCLL TE DIFFERENTIAL C33-R606B WATER LEVEL INDICATOR AT
! . WATER LEVEL COULD FLUCTUATE BEYOND PRESSURE SIGNAL (WATER INACCURATE READING. REACTOR FEED- RANGE OF RECORDER. ANNUNCIATOR WILL LEVEL) WATER ERROR IN LEVEL FOLLOWING. . ALARM IN CONTROL ROOM. NUCLEAR BOILER B21-N058B BROKEN MINIMQt PRESSURE SIGNA; '
'Iv0 OUT OF FOUR HIGH PRESSURE TRIPS NONE l AND FOR RECIRC PUMPS A AND B DISABLED.
B21-N058F I PLUGGED CONSTANT PRESSURE SIGNAL l TWO OUT OF FOUR HIGH PRESSURE TRIPS NONE FOR RECIRC PUMPS A AND B DISA*'ID. B21-N0628 BROKEN MINIMUM PRESSURE SIGNAL PRESSURE RECORDER R623B INDICATES NONE MINIMUM PRESSURE. PLUGGED CONSTANT PRESSURE SIGNAL PRESSURE RECORDER'R6238 INDICATES NONE CONSTANT PRESSURE.
- B21-N068B BROKEN MINIMUM PRESSURE SIGNAL PRESSURE TRANSMITTERS PART OF IDW-LOW NONE AND SET RELIEF TUNCTION OF SAFETY / RELIEF B21-N068F PLUGGID C0hSTANT PRESSURE SIGN 8tL VALVES. SYSTEM IS SAFETY GRADE AND SINGLE FAILURE PROOF, BACKED UP BY REDUNDANT SENSORS.
B21-N078B BROKEN
- MINIMQI PRESSURE SIGNAL HIGH RPV PRESSURE SCRAM SIGNAL ON ONE NONE CHANNEL DISABLED. HALF LOW PRESSLTE PERMISSIVE FOR MANUAT. OPENING OF RHR VALVES.
- PLUGGED CONSTANT PRESSURE SIGNAL HIGH RPV PRESSURE SCRAM SIGNAL ON ONT NONE CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MANUAL OPENING OF RHR VALVES INOPERATIVE.
i l INSTRIBENT LINE 2 PAGE 2 0F 3 REFERENG 120 rummeING CHAMBER B21-D004B 12-152I s (A-5) t 1 QQP I)* / "a.' #Y I; I , , [ ,.
'y re APPENDIX A .i RIVER BEND COMMON SENSOR FAILURE FAILURE TYPE COMMON TAP (BROKEN OR SYSTEM ID SENSOR MPL EFFECT ON RPV WATER LESIL, .
Pl.UGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER TEEDWATER C33-N008B BROKEN MINIMUM PRESSLRE SIGNAL SIGNAL SENT TO REACTOR RECIRC SYSTEM RECIRC PUMP B OPERATION REDUCED TO CAVITATION INTERLOCK, RECIRC PUMP B 25% OF FULL RATED SPEED. REACTOR RUN BACK TO LFMG SET OPERATION. POWER REDUCED, WATER LEVEL INCREASES. PLUGGED CONSTANT PRESSURE SIGNAL SIGNAL TO REACTOR RECIRC SYSTEM CAVI- NONE TATION INTERLOCK INOPERATIVE. BACKEL LP BY C33-N008A. RECIRC SYSTEM B33-N040 BROKEN MINIMUM PRESSURE SIGNAL THERMAL LIMIT INTERLOCK WILL TRIP RECIRC FUMP FLOW REDUCED, REACTOR RECIRC PUMP A. POWER REDUCED, WATER LEVEL INCREASES. PLUGGED CONSTANT PRESSIRE SIGNAL TIIERMAL LIMIT INTERLOCK FOR RECIRC NONE PUMP A INOPERATIVE. 6 4 INSTR E LINE 2 PAGE 3 0F 3 REFERENCE IAG CONDENSING CBAISER B21-D004B 12-152113 (A-6) fY {f : 3, b
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APPENDIX'A RIVER BEND COMMON SENSOR FAILURE
~
FAILURE TYPE COMMON TAP (BROKEN OR EFTECT ON RPV WATER LEVEL, ' SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER NUC H AR BOILER B21-N044C BROKEN MAXIMUM DIFFERENTIAL LEVEL RECORDER R6I5 INDICATES HIGH NONE PRESSURE SIGNAL (HIGH WATER LEVEL (INSTRUMENT USED DURING WATER LEVEL) SHUTDOWN TO RECORD WATER IIVEL). l PLUGGED INACCURATE DIFFERENTIAL ' LEVEL RECORDER R615 WILL RECORD NONE PRESSURE SIGNAL (WATER INACCURATE WATEh LEVEL DURING SHUT-LEVEL) DOWN. E21-N073C BiOKEN MAXIMUM DIFFERENTIAL HALF OF SIGNAL TO CLOSE HPCS INJEC- NONE AND PRESSURE SIGNAL (HIGH TION VALVES. LEVEL 2 INITIATION B21-N073G WATER LEVEL) SIGNAL FOR HPCS INOPERATIVE. PLLGGED INACCURATE DIFFERENTIAL POSSIBLE INITIATION OF HPCS ON LOW FEEDWATER CONTROL WILL ADJUST FOR PRESSURE SIGNAL (WATER WATER LEVEL. HPCS FLOW. MINOR PERTURBATION IN LEVEL) WATER TEMP. MILD DEPRESSURIZATION. B2I-N080C BROKEN MAXIMUM DIFFERENTIAL WATER LEVEL 8 SCRAM SIGNAL CHANNEL C. NONE PRESSURE SIGNAL (HIGH WATER LEVEL 3 SCRAM AND ISOLATION WATER LEVEL) SIGNAL CHANNEL C INOPERATIVE. PLUGCED INACCURATE DIFFERENTIAL POSSIBLE INITIATION OF WATER LEVEL 3 NONE PRESSURE SIGNAL (POSSIBLE SCRAM AND ISOLATION SIGNAL CHA!Orr.L C. IDW WATER LEVEL SIGNAL) NUCLEAR BOILER B21-N08IC BROKEN MAXIMUM DIFFERENTIAL HALF OF WATER LEVEL I MSIV ISOLATION NONE PRESSURE SIGNAL (HIGH INOPERATIVE, HALF OF WATER LEVEL 2 WATER LEVEL) ISOLATION SIGNAL INOPEhATIVE. PLUGGED INACCURATE DIFFERENTIAL POSSIBLE INITIATION OF HALF WATER NONE PRESSURE SIGNAL (POSSIBLE LEVEL I MSIV ISC'.ATION. AND HALF LOW WATER LEVEL SIGNAL) WATER LEVEL 2 ISOLATION. FEEDWATER ( 33-N004C BROKEN MAXIMUM DIFFERENTIAL C33-R606C WATER LEVEL INDICATOR FALSE NONE PRESSURE SIGNAL (HIGH HIGH READING. HALF MAIN TURBINE AND WATER LEVEL) RFP MOTOR TRIP ON HIGH WATER LEVEL. ANNUNCIATOR ALAPJf IN CONTROL. PLUGGED INACCURATE DIFIT.RENTIAL C33-R606C WATER LEVEL INDICATOR AT NONE PRESSURE SIGNAL (WATER INACCURATE READING. LEVEL) ' INSTRIMNT LINE 1 PAGE I 0F 2 REFERENCE IAG etummING CHAMBER B21-D004C I2-I52I s (A-7) t r; .
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APPENDIX A' '. RIVER BEND C0tc10N SENSOR FAILURE a FAILURE T(PE COMMON TAP (BROKEN OR EFFECT ON RPV WATER LEVEL, SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWR NUCLEAR BOILER B21-N078C BROKEN MINIMUM PRESSURE SIGNAL RIGH RPV PRESSURE SCRAM SIGNAL ON ONE NONE CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MANUAL OPENINC OF I;iR VAL \T.S. PLUGGED CONSTANT FRESSURE SIGNAL HIGH RPV PRESSURE SCRAM SIGNAL ON ONE NONE-
- CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MANUAL OPENING OF RHR VALVES INOPERATIVE.
INSTRlRENT LIE 3 PAGE 2 OF 2 REFERENCE I2G CONDENSING CNAL*3ER R21-D004C 12-152I s (A-8) t
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'$ei RIVER BEND COMMON SENSOR FAILURE
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FAILL1tE TYPE . COMMON TAP (BROKEN OR M EFFECT ON RPV WATER LEVEL, SYSTEM ID SENSOR MPL PLUGGED) PRIMART EFFECT SECONDARY EFFECT PRESSURE OR POWER NUCIZAR BOIER B21-N044D BROKEN MAXIfRRI DIFFERENTIAL . LEVEL INDICATOR R610 INDICATES MIGN NOW PRESSURE SIGNAL (MIGN, WATER LEVEL (INSTRLMNT USED DURING WATER LEVEL) SHUTDOWN TO INDICA *E WATER LE%TL). PLUGGED INACCURATE DIFFERENTIAL LEVEL INDICATOR R610 WILL INDICATE NONE PRESSURE SIGNAL (WATER INACCURATE WATER LEtTL DLRING LEVEL) SHUTDOWN. B21-N073L BROKEN MAXIMUM DIFFERENTIAL HALF OF SIGNAL TO CLOSE HPCS INJEC- NONE AND PRESStitE SIGNAL (HIGH TION VALVES. LEVEL 2 INTTIATION B?I-N073R WATER LEVEL) SIGNAL FOR HPCS INOPERATIVE. PLUGCED INACCURATE DIFFERENTIAL POSSIBM INITIATION OF HPCS ON I4W FEEDWATER CONTROL WILL' ADJUST FOR PRESSURE SIGNAL (POSSIBE WATER LEVEL. HPCS FLOW. MINOR PERTURBATION IN' LOW WATER LEVEL SIGNAL) WATER TEMP. .MIIa DEPRESSURIZATION. 821-NO800 BROKEN MAXIMUM DIFFERENTIAL WATER IIVEL S SCRAM SIGNAL CHANNEL 3. NONE PRESSURE SIGNAL (NIGN WATER LEVEL 3 SCRAM AND ISOLATION WATER LEVEL) SIGNAL CHANNEL D INOPERATIVE. PLUGGED INACCURATE DIFFERENTIAL POSSILLE INITIATICN OF WATER LEVEL 3 NONE
- PRESSURE SICNAL (POSSIBLE SCRAM AND ISOLATICN SIGNAL CHA!OiEL D.
LOW WATER LEVEL SIGNAL) B21-N081D BROKEN MAXIMUM DIFFERENTIAL HALF OF WATER IISIL I MSIV ISOLATION NONE PRESSL1tE SIGNAL (HIGN INOPERATIVE. HALF OF WATER LEVEL 2 WATER EVEL) IS01ATION SIGNAL INOPERATIVE. PLUGGED INACCL1 TATE DIFFERENTIAL POSSIBLE INITIATICN OF HALF WATER NONE PRESSL1tE SIGNAL (POSSIBLE . LEVEL I MSIV IS01ATION AND HALF OF LOW WATER EVEL SIGNAL) WATER LEVEL 2 ISOLATION. 9 B21-N078D BROKEN MINIMUM PRESSL1tE SIGNAL HIGH RPV PRESSL1tE SCRAM SIGNAL ON ONE NONE CHANNEL DISABLED. HALF LOW PRESSURE PERMISSIVE FOR MA.WAL OPENING OF RHR VALVES. PLUGGED CONSTANT PRESSIRE SIGNAL MIGN RPV PRESSIRE SCRAM SIGNAL ON OR NONE CNANNEL LISABIED. NALF IAW PRESSURE
. PERMISSIVE FOR MANUAL OPENING OF R R VALVES IN03RATIVE. ,
INSTRIN NT LIM 4 PAGE 1 0F I FRERENCE IBG COMNSING CHAMR R21-D004D 12-152I s (g.g} t I f
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RIVER BEND COtt10N SENSOR FAILURE t FAILURE TYPE C0'210N TAP (BROKEN OR EFFECT ON RPV WATER MVEL, STSTEM ID SENSOR MPL PLUGGED) PRIMARY EITECT SECONDARY EFFECT PRESSURE OR POWER NUCLEAR BOILER 821-N027 BROKEN MAXIFKM DIITERENTIAL R605 SPUTDOMI WATER IIVEL INDICATOR NONE PRESSURE SIGNAL (WIGN AT MAXIrlUM WATER LEVEL INDICATION. WATER LEVEL) PLUGGED INACCURATE DIFIIRENTIAL R605 SHUTDOWN WATER LEVIL INDICATOR h0NE PRESSURE SIGNAL (WATER AT INACCURATE READING.
- LEVEL)
TEEDWATER C33-N017 BROKEN MAXIMUM DIITERENTIAL R608 WIDE RANCE LEVEL RECORDER WILL NONE PRESSURE SIGNAL (HIGH INDICATE MAXIMt2I WATER LEVEL. WATER LEVEL) PLUGGED INACCURATE DIITERENTI AL R608 WIDE RANCE LEVEL PECORDER WILL NONE PRESSURE SIGNAL (W4TTR IhblCATE INACCURATE WATER E VEL. LEVEL) I N LIE 5 fig. 1 0F 1 REFERENCE IAC COINIENSING CNAMBER B21-D002 12-152I o (a.go) t
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APPENDIX A *
+-
RIVER BEND C0fet0N SENSOR FAILURE
+
l FAILLITE TYPE C0ft10N TAP (BROKEN OR SYSTEM ID SENSOP MPL PLUCCED) EFFECT ON RPV WATER LEVEL. PRIMART EFFECT SEC04 DART EFFECT PRESSURE OR POWER ! NUCIZAR BOILER B21-N080A BROEN MINIMUM DIFFERENTIAL WATER E VEL 8 SCRAM SIGNAL CHANNEL A, %ONE PRESSURE SIGNAL (LOW WATER LEVEL 3 SCRAM AND IS01ATION WATER IEEL) SIGNAL ON CHANNEL A INOPERATIVE. PLUGGED INACCURATE DIFFERENTIAL POSSIBLE WATER LEVEL 8 SCRAM SIGNAL NONE PRESSL1tE SIGNAL (POSSIBLE CHANNEL A. LEVEL 3 SLRAM AND ISOIA-HIGH WATER IE EL SIGNAL) 110M SIGNAL ON CHANNEL A INOPERATIVE. B21-N095A BROEN MINIMUM DIITERENTIAL PARTIAL ADS A WATER LEVEL 3 INITIA- NONE T1tESSL1tE SIGNAL (LOW TION SIGNAL. WATER LEVEL) PLUGGED INACCL1 TATE DIITERENTIAL PARTIAL ADS A WATER LEVEL 3 INITIA- NONE PRESSL1tE SIGNAL (POSSIBLE TION SIGNAL INOPERATIVE. HIGH WATER L' VEL SIGNAL) FEEDWATER C33-N004A BROKEN MINIMUM DIFFERENTIAL C33-R606A WATER LEVEL INDICATOR FALSE CONTINUED CONTROL ON CHANNEL A WOIILD PRESSL1tE SIGNAL (LOW LOW READING. INCRr.ASED FEEDWATER RESULT IN HIGH WATER LEVEL IN VESSEL, WATER LEVEL) FLOW. ANNUNCIATOR ALARM IN CONTROL POSSIBLE SCRAM. OPERATOR WOULD HAVE ROOM. RECIRC PUMPS RUNBACK M LPtG TO IGNORE ANNUNCIATOR AIARM. SET OPERATION. PLUGGED INACCL1 TATE DIFFERENTIAL C33-R606A WATER LEVEL INDICATOR AT WATER LEVEL COULD FLUCTUATE BETOND PRESSL1tE SIGNAL (WATER INACCt1 TATE READING. REACTOR FEED- RANGE OF RECORDER. ANNUNCIATOR WILL LEVEL) WATER ERROR IN LEVEL FOLLOWING. ALARM IN CONTROL ROOM. e 4 INSTRIBENT LIM & PAGE 1 0F 1 VARIABEZ IEG LIM Al 12-152113 (A-11) k
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APPENDII A
- RIVER BEND COMMON SENSOR FAILI5tE 5
FAILLltE TYPL C0!t10N TAP (BROKEN OR SYSTEM ID SENSOR MPL EFFECT ON RPV WATER LEVEL, PLUGGED) PRIMABT EFFECT SECONDARY EFITCT PRESSURE OR PonER NOCH AR BOILER 821-5081A mannu MINIfRBg DIFFERENTIAL EALF WATER m tL I MSIV IS01ATION, NOE PRESSIRE SIGNAL (LOW EALF WATER LEVEL 2 ISOLATION SIGNAL. WATER LEVEL) PLUGGED INACCL1 TATE DIFFERENTIAL HALF WATER LEVEL I MSIV ISOLATION, NONE PRESSL1tE SIGNAL (POSSIBLE AND RALF WATER LE\TL 2 ISOLATION
- HIGH WATER LEVEL SIGNAL) SIGNAL IMOPERATIE.
B21-N091A BROKEN- MINI"l2I DIITERENTIAL RRR A AND LPCS INITIATION, HALF RCIC NONE AND PRIML1tE SIGNAL (IDW LOW WATER LEVEL INDICATION. DIVI- - 521-N091E WATER LE%IL) SION I RCIC HIGH WATER LEVEL TL1tBINE TRIP INOPERATIVE. PARTIAL ADS INITIATION. PI.UGGED INACCIRATE DIFFEFENTIAL RHR A. LPCS, HALF RCIC, AND PARTIAL NONE PRESSL1tE SICMAL (POSSIBM ADS INITIATION INOPERATIVE. HALF HIGE WATER LEVEL SIGNAL) RCIC HIGH WATER WIL TL1LBINE TRIP. a21-N099A BBOKEN MI41M2I DIFFERENTIAL IWO OCT OF FOL1t RECIRC (A AND B) NONE AND PRESSURE SIGNAL (LOW W TL 2 PUMP TRIPS, B21-No99E WATER WIL)
- PLLT.GED INACCL1 TATE DIITERENTIAL IWO OLT OF FOUR RECIRC (A Ah3 B) NONE PRESSL1tE SIGNAL (POSSIBM LE%IL 2 INMP TRIPS INOPERATIVE.
HIGH WATER LEVEL SIGNAL) s 1 , INSim m erF LI M 7 PAGE I or i VARIABER 1RG LIE A2 U i 12-15210 (A-12) Sk -
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e APPENDIE A '8',~ l RIVER BEND COMM04 SENSOR FAILIRE B FAILLltE TYPE CC?PIDW TAP (BROKEN OR SYSTEM I'i EFFECT ON RPV WATER E VEL, SENSOR MPL FLtGGED) PRIMARY ETTECT SECONDART EFTECT FwMM OR PotER WUCLEAR BOIER B21-N027 BM MIN!!R21 DIFFERENTIAL R605 SNLTDOWN WATER LEVEL IMICATOR NOE PMSSimE SIGNAL (IAW AT MININE2t WATER LEVEL IISICATION. WATER LEVEL) PLUGGED INACCL' RATE DIFFERENTIAL R605 SHUTDOWN WATER LEVEL INDICATOR NOE PRESSL1tE $1GNAL (POSSIBLE MAT INDICATE MIGH WATER LEVEL. ' HIGH EATER LEVEL SIGMAL4 B21-50808 SROKEN MINIML3 DIITERENTIAL WATER LEVEL 3 SCRAM AND ISOLATION NODI PRESSL'RE SIGNAL (LOW SIGNAL CHANNEL B. WATER LEVEL 8 WAIER IIVEL) SCRAM SIGNAL CHANNEL B INOPERATIVE. ILUGGED INACCL1 TATE DIITERENTIAL POSSIB E WATER LEVEL 8 SCRAM SIGNAL NONE PRESSL1tE SIGNAL (POSSIBM CHANNEL B. HIGR WATER LEVEL SIGNAL) B21-M3958 BROKEN MINI!!U?! DIITERENTIAL PARTIAL ADS B WATER EVEL 3 NOME
- PitESStatE SIGNAL (LOW INITIATION.
WATER LEVEL) PLUGGED IMACCL1 TATE DIITERENTIAL ADS B WATER LEVEL 3 INITIATION N0hE
- PRESSL1tE SIGNAL (POSSIBLE INOPERATIVE.
HIGR WATER EVEL SIGNAL) TEEDWATER C33-50043 BROKEN MINIMC?t DIITERENTIAL C33-R6068 WATER LEVEL INDICATOR FALSE CONTINUED CONTROL ON CMAIRIEL B WOULD PRESS 11rE SIGNAL (14W LOW READING. INCREASED FEEDWATER RESULT IN MIGN WATER LEVEL IN VESSEL, WATER IIVEL) FIDW. ANNI:NCIATOR AIARM IN CONTROL POSSIBIZ SCRAM. OPERATOR WOUM NAVE ROOM. RECIRC PUMPS RUNBACE TO LFMG TO IGIIORE AIAREECIATOR AIARM. SET OPERATION. PLtX;GED INACCL1 TATE DIFIT.RENTIAL C33-R6068 WATER LEVEL INDICATOR AT WATER LEVEL COU M FLUCTUATE BETOND PRESSL1tE SIGNAL (WATER IMACCL1 TATE READING. REACTOR TEED- RANCE OF RECORDER. AIRIUNCIATOR hi" LEVEL) WATER EIutot IN EVEL FOLLOWING. ALARM IN CONTROL 300N. C33-N017 BROKEN MINIMU?t DIFTERENTIAL R608 WIDE RANGE LEVEL RECORDER WILL NONE PRESSL'RE SIGNAL (IDW INDICATE flINI!R21 WATER LEVEL.
- WATER LEVEL)
PLUGGED INACCIRAiE DIFFERENTIAL B d WI M RAIIGE 12 VEL RECORDER WILL Nom FM M M SIGRAL (WATER IWICATE ImmTE WATER IEVEL. IEVEL) INSTRIBENT LIM 8 PAGE I 0F I VARIABEE IBG LIM BI 12-1521:e (g.g3) l2 , , L
h. e. 1' . APPENDIX A '
- RIVER BEND COER10N SENSOR FAILLltE i
i FAILL1LE TYPE l cottM0N TAP (BROKEN OR , SYSTE't ID EFFECT OK RPV WATER LEVEL, SENSOR ?tPL PLUCCED) PRIMARY EFFECT SECONDARY EFFECT PRESSIEtt OR P0bER j NUCLEAR BOIM R 321-N041R BROEEN MINI'Ut DIFFERENTIAL MAIX WATER EVEL 1 MSIV ISOIATION, NOIE ! PRESSURE SIGNAL (IDW NALF WATER mTL 2 ISOLATION SIGNAL. WATER LEVEL) PLUGGED INACCL1 TATE DIFTIRENTIAL RAIJ WATER LEtTL 1 *tSIV ISOLATION, t NONE ' PRESSL1tE SIGNAL (POSSIBLE AND NALF WATLR LE%IL 2 ISOLATION " ! HIGR WATER LEVEL SIGNAL) $!GMAL INOPERATIVE. ( I B21-%0918 BROKEN MINI!fLM DIFFERENTIAL RNR (B AND C) INITIATION. HALF RCIC NOME ! AND PRESSL1tE SIGNAL (LOW LOW WATER LEVEL INITIATION. DIVI-B21-%091F WATER W TL)' $10N 2 RCIC HIGN WATER LEVEL TL1tBINE TRIP INOPERATI51. PARTIAL ADS INITIATION. PLUGGED INACC12 ATE DIFIIRENTIAL RER (B AND C). HAIE RCIC, AND PARTIAL NONE PRESSL1tE SIGNAL (POSSIBII. ADS INITIATION INOPERATIVE. MALF EIGH WATER E VEL SIGNAL) RCIC NIGH WATER WTL TLRBINE TRIP. B21-VM95 BROKEN MINI'Of DIFFERENTIAL TWO CLT OF FOL1t RECIRC (A AND B) NONE
.W. PRESSL1tE SIGNAL (LOW LEVEL 2 Pt2tP TRIPS.
821-%099F WATER MVEL) ' PLUCCED IMACCL1 TATE DIf7ERENTIAL TWO OUT OF F0tJt RECIRC (A AND B) NONE PRESSL1tE SIGNAL (POSSIBIE. LEVEL 2 PtRIP TRIPS INOPERATIVE. RIGH WATER LEVEL SIGNAL) s ~ ;< , INSTMBENT LIM 9 PAGE 1 0F 1 VARIARLE 1EG LIE R2 12-1521ss (g.gg)
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l HICH WATER LEVEL SICMAL) i FEECWATER C33-N004C BROKEN MINIMutt DIFTERENTIAL C33-R606C WATER LE\IL INDICATOR TALSE NOIIE i PRESSL1tE SIGNAL (IDW IDW READING. LEVEL SIGNAL FAILL1tE j WATER LEVEL) ANNL18CIATOR ALAR!t IN CONTROL ROON. PLUCCED INACCL1 TATE DIITERENTIAL C33-R606C WATER LEVEL INDICATOR AT NONE PRESSURE SIGNAL (WATER INACCL1 TATE READING. LEVEL) S e 0 INSTRtRENT LIlE 10 PAGE 1 0F 1 VARIARIE LEG LIE C1 12-152113 (A-15)
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APPENDIX A *',,! RIVER BEND COMMON SENSOR FAILL1tL FAILL1tE TYPE CCMMON TAP (BROKEN OR EFFECT ON RPV WATER LEVEL,. SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSIRE OR P0hER NUCLEAR BOIIIR B21-N073C namn MININUM DIFTERENTIAL INITIATION OF MPCS ON IDW WAT'It FEEDWATER Corm 0L WILL ADJUST FOR AND PRESSINtE SIGNAL (IDW LEVEL. MPCS FLOW. MINOR PatTtRBATION IN B21-N073G WATER LEVEL) WATER TEMP. MILD LLPRESSURIZATION. PLUGGED INACCL1 TATE DIITERENTIAL INITIATION SIGNAL FOR HPCS ON IDW NONE PRESSL'RE SIGNAL (POSSIBLE WATER LEVEL INOPERATItl. POSSIBLE HIGH WATER LEVEL SIGNAL) HALF OF SIGNAL TO CLOSE HPCS INJEC-TION VALVES. B21-N08IC BROKEN MINIMLM DIFFERINTIAL HALF WATER LEVEL I MSIV ISOIATION, NONE PRESSL1tE SIGNAL (LOW HALF WATER LEVEL 2 IGOLATION SIGNAL. WATER LEVEL) PLUGGED INACCL1 TATE DIFIIRENTIAL POSSIBLE HALF WATER LEVEL I MSIV NOME PRESSURE SIGNAL (POSSIBLE ISOLATION AND HALF WATER IIVEL 2 HIGH WATER IIVEL SIGNAL) ISotATION SIGNAL INOPERATIVE. INSTRL M LIIE II PAGE I 0F I VARIABLE IRC LIE C2 12-1521 3 (a.I6) t : . I y : A
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APPENDIX A - RI1TR BEND COMMON SENSOR FAILURE
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FAILL1iE TYPE COMMON TAP (BROKEN OR SYSTEM ID SENSOR ftPL EFFECT ON RPV WATER LE\1L, PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSERE OR PonER NUCLEAR BOILER R21-N044C 3ROEN MINIMUlf DIFFERENTIAL LEVEL RECORDER R615 INDICATES IDW MOK PRESSURE SIGNAL (LOW WATER LEVEL (INSTPtW.NT 11 SED DURING WATER LEVEL) SEiDC%N TO RECORD WATER LEVEL). PLUGGED INACCURATE DIFFERENTIAL LEVEL RECORDER R615 WILL RECORD .NOhI . PRESSLRE SIGNAL (WATER INACCl3 ATE WATER LEVEL DURING
- LEVEL) SHUTDCW.
9 O INSTRERENT LIN 12 PREE 1 0F 1 VARIARIX IAG LIM C3 12-1521 e (4 3y3
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i i i RIVER BUD CQtO5 SDISCR FAILERE FAIL 13tE TYPE CR1MC5 TAP (BBOEEN M SYSTEM IS SEASOE WL EFFECT ON RFV nlATER IIWL, FtCCGED) PRIFIAPT EFTECT SECCISABY EFFECT FM PR FOIER IWCLEAR 301133 M 1-9067C 330EEN MINIIARE PRES $tBE SIGNAL AIS MAZE DET W LL PRES $4EE SIGMAL IN0FERA- NOK TIW; EPCS CAN BE INITIATED N TESSEL 3 1-506M LOW IiATER IETL PLEGGED CC5STAIET Fw t N SIGNAL S M AS FOR BROKEN LIE IIDIE ! EEacTCR C71-250C BACKEN HI51525 PRE 9513E SIGNAL CHANNEL C FCR SCRAM OK HICH DRYWLL IIGIE i FMIECIits PRESSCRE IIIDFERATIST FLICCED CCMSTANT FRESSIEE SIGNAL S M AS FOR BROEEN LI E 3101E nummmmmer LIE 36 Fem 1 4R 3 m M EING LIE 114* 10168* AZIM 12-1521** (A-21)
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e e. APPENDIX A ' RIVER EDD COTION SDSCR FAILLE EAILLE TTPE CaeIDE TAP (ta0EEN CR SYSTDt ID N trt EFTECT ON RPV WATER IEVEL. PLDGGED) PRIMARY EFTICT SE w m Y EFFECT Partsaar OR POWER grrtr e BOILER 321-50943 namn nigI3 Rag M SIGNAL RALF MICM DETWELL PRESSL1tE SIGNAL NOIE AM DOPERATIVE: RB (B)/MR (C)/ECIC/ ADS B21-5094T (B) CAS BE INITIATED ST %ISSEL LOW bATER LE%IL PLOCCED CONSTANT F8Ftt N ,SICEAL SWE AS FOR BROKEN LINE NOME REMJ C71-30$CS RENn 315! 17 PRESSLM SIGMAL CHtBIL B FOR SCRA:1 CW EIGH DRTWELL NOME PROTECTICE PREaSL'RE IEOPERATIST. PLL E CollSTANT PRESSCRE SICAAL SN1E AS FOR BROKEN LINE NONE Rf41RC SYSTEN B: 1-505C3 namn nIgI!R3g yM SSIEE SIGNAL RALF BICE DRTWELL PRESSERE SICMAL IIONE I%0 PERATIVE; Loss OF ABILITY TO LOCK RECIRC FLOW CohTROL VAL %IS IN CONTROL POSITION PLUGGED CostSTANT PRESSIEE SICIAL SrtE AS FOR BROKEN LI E P"*E i 1 I . l l l IN LYM 19 PAGE I W 3 CN MMING LIE 250* M 254* AZ118 12-1521 a (g.343
a ~ APPEISIX A - RIVER BEND Com0N SENSCR FAILL1tE FAILLllE TYPE Comc% TAP (BROEEN OR EFITCT ON RPV WATER LEVEL, SYSTDI ID SENSOR TL PLIEGED) PRI!uRT EFFECT SEC0km a? EFFECT PRESSURE OR Pole.R IEE IEE-LS7A REH M NCE A BREAE IN ANY REFERENCE NOIST13E SEPARATOR REM ATER LDSS OF FIRST POINT IEEDidATER E ATING. IEElm-LS26A LIE - LIE ON TIE STANDPIPE WILL DRAIN SUPPLY TO FIRST POINT MATER SLIGIIT REDUCTION IN FEEDidATER TDIPERA* IHDH-LT6A CALE T E PRESSI1tE TO DROP. ISOLATED (IDSR-LV65A). EXTRACTION TUltE. REACTOR *.00LANT TD!PERATt3E IES-LI26A ALL 4ESTRCIENTS SENSE A STEAM TO FIRST P0lNT HEATER ISOLATED SLIGHTLY REDUCED. NI'.1ER IDTL TEAN ACTUAL (IESS-MOV3 A). CPENS FIRST POINT llEATER LEVEL. IEATER DRAIN LINE TO COCENSER * (IHDH-LV26A). REFERENCE INSTRt21ENT SENSES CONSTANT IF A FALSE IDW SIGNAL IS GENERATED, NO LOSS OF FIRST POINT FEEDVATER EATING. LINE PLUGGED PRLSSL1tf AT REFERENCE LINE. I?f1EDIATE EFFECT. IF A FALSE HIGH SLIGHT REDUCTION IN FEEDWATER TUtPERA-INACCt3 ATE SWITCH OPERATION SIGNAL IS GENCD, SEE " REFERENCE TI3E. REACTOR C001. ANT TD!PERATL1tE MAY GENERATE A FALSE MIGH LINE BROKEN," THIS INSTRISENT LINE. SLIGHTLY REDUCED. OR LOW IBIL SIGNAL. hJTE: "A" SIDE IFTTRC1ENTS LISTED, *R" SIDE SIMILAR IIISTRESENT LIM 20 FIRST POINT FEEDitTER RATER IAVEL INSTunerFATIN MFERENCE LIM PAGE 1 or 1 12-152It s (a.25)
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APPENDIX A
- l RIVER BEND COPPt0N SENSOR FAILURE . -
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'l FAILURE TYPE COMMON TAP (BROKEN OR EFFICT ON RPV WATER LEVEL, SYSTE*f ID SENSOR MPL PLUGGED) PRIMARY EFFECT SEC00 MARY EFFECT PRESSURE OR POE R HDR IMDH-LS7A VARIABIZ IF LEVEL IS ABOVE BROEN NOK NOK l IMD5-LS26A LI g aanrru LINE, STANDPIPE AT A lader IMDH-LT6A LESIL TRAN TE EATER. ALL IMDH-LT26A INSTRUMENTS ON STAhDIIPE SENSE LOWER LEVEL THAN ACTUAL EATER LEVEL.
IF LEVEL IS BELOW BROKEN MOISTURE SEPARATOR REE ATER DRAIN LOSS OF FIRST POINT FEEDWATER NEfTING. LIhl. IT CAUSES STANDPIPE SUPPLT TO FIRST POINT HEATER IS01ATED ~ SLIGHT REDUCTION IN FEEDVATER TEftrERA-PRESSURE TO DROP. ALL (IDSR-LV6SA). EXTRACTION STEAM To TURE. REACTOR COOLANT TEMPERATURE INSTRUMENTS ON STANDPIPE FIRST POINT EATER ISOI.ATED- SLIGHTLY REDUCED. SENSE HIGER LEVEL THAN (lESS-MOV3A). OPENS FIRST POINT # ACTUAL EATER LEVEL. EATER DRAIN LI E TO CONDENSER (lHDH-LV26A). VARIABLE INSTRt2 TENT SENSES CONSTANT IF A FALSE LOW SIGNAL IS GENERATED, LOSS OF FIRT POIlff FEEDWATER EATING. LINE PLUGGED PRESSURE AT VARIABLE LINE. NO I!tfEDIATE EFFECT. IF A FALSE SLIGHT REDUCTION IN FEEDWATER TEMPERA-INACCURATE SWITCH OPERA- HIGH SIGNAL IS GENERATED, SEE TURE. REACTOR C001 ANT TP1PERATURE TION ttAY GENERATE A FALSE " REFERENCE LINE BROKEN," LINE 20. SLIGHTLY REDUCED. H!CH OR LOW LEVEL SIGNAL. NOTE: "A" SIDE INSTRM.lCS LISTED, "B" SIDE SIMIIAR - INSTRtBENT LIE 21 FIRST POINT FEEDWATER MATER I2 VEL INSTRIMENTATION VARIABIA LIE PAGE 1 0F 1 12-1521t s (A-26) r $
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*4' RIVER BEND CottiON SENSOR FAILURE
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'/AILURE TYPE COMMON TAP (BROKEN OR EFFECT OW RPV WATER LEVEL, SYSTEM ID SENSOR MPL ft.UGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSt%E OR POWER HDL IHDL-LSIIA REFERENCE A BREAK IN ANY REFERENCE FIRST POINT HEATER DRAIN SUPPLY TO LOSS OF SECOND POINT FEEDWATER IHDL-LS25A LINE BROKEN LINE ON THE STANDPIPE WILL SECOND POINT HEATER ISOLATED (IMDH- HEATING. SLIGHT REEUCTION IN TEED-IHDL-LT5A CAUSE THE MtF.SSURE TO . LV6%). EXTRACTION STEAM TO SECOND WATER TEMPERATURE. PE. ACTOR C00! ANT 1HDL-LT25A ' DROP. ALL INSTRUMENTS - P0 INT HEATER ISOLAND (1ESS-MOV28A). TEMPERATURE SLIGHTLY Rr.DUCED.
SENSE A HIGHER LEVEL THA.4 OPENS SECOND POINT HEATER DRAIN LINE ACTUAL LEVEL HEATER LEVEL. TO CONDENSER (IHDL-LV25A). _ , - REFERENCE INSTRl' MENT SENSES CONSTANT IF A FALSE LOW SIGNAL IS GENERATED, NO LOSS OF SECOND POINT TEEDWATER LINE PLUGGED PRESSURE AT REFERENCE LINE. IMMED' 'TY EFFECT. IF A FALSE HIGH HEATING. SLIGHT REDUCTION IN FEED-INACCURATE SWITCH OPERATION SIGNAL 13 GENERATED, SEE " REFERENCE WATER TEMPERATURE. REACTOR C001 ANT MAY GENERATE A FALSE HIGH LINE BROKEN," THIS INSTRUMENT LINE. TEMPLRATURE SLIGHTLY REDUCED. OR LOW IIVEL SIGNAL. ' 4 NOTE: "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMILAR INSTRt2ENT LINE 22 SECOND POINT FEEDWATER MEATER IIVEL INSTRtRENTATION REFERENCE LINE PAGE I 0F I 12-1521:s (A-27) k ,' '
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FAILURE TYPE COMMON TAP '(BROKEN OR SYSTEM ID SENSOR MPL EFFECT ON RPV WATER LEVEL, PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER _ HDL IHDL-LSIIA VARIABLE IF LEVEL IS ABOVE BROKEN NONE NOME IMDL-LS25A LINE BROKEN LINE, STANDPIPE AT A LOWER
- IHDL-LTSA LEVEL THAN THE HEATER. ALL IMDL-LT25A INSTRUMENTS ON STANDPIPE SENSE LOWER LEVEL THAN ACTUAL HEATER LEVEL.
IF LEVEL IS BELOW BROKEN FIRST POINT HEATER DMAIN SUPPLY LOSS OF SECOND POINT FEEDWATER LINE, IT CAUSES STANDPIPE TO SECOND POINT HEATER IS0!ATED HEATING. SLIGHT REDUCTION IN FEED-PRESSURE TO DROP. ALL (IHDH-LV6A). EXTRACTION STEAM TO WATER TEMPERATURE. REACTOR C001 ANT INSTRUMENTS ON STANDPIPE SECOND POINT HEATER ISOLATED TE N ERATURE SLIGHTLY REDUCED. SENSE A HIGdER LEVEL THAN (IESS-MOV28A). OPENS SECOND POINT ACTUAL HEATER IIVEL. HEATER DRAIN LINE TO CONDENSER (INDL-LV25A) (IHDL-LV25A) VARIABLE INSTRUMENT SENSES CONSTANT IF A FALSE LOW SIGNAL IS GENERATED, LOSS OF SECOND POINT FEEDWATER LINE PLUGGED PRESSURE AT VARIABLE LINE. NO IMMEDIATE EFFECT. IF A FALSE HEATING. SLIGHT REDUCTION IN FEED-INACCURATE SWITCH OPERATION HIGH SIGNAL IS GENERATED, SEE kATER TEMPERATURE. REACTOR COOLANT MAY GENERATE A FALSE HIGH " REFERENCE LINE BROKEN," LINE 22. TEMPERATURE SLIGHTLY REDUCED. OR LOW LEVEL SIGNAL.
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'SYSTE.M ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER HDL 1HDL-LS10A REFERENCE A BREAK IN ANY REFERENCE MOISTURE SEPARATOR DRAIN SUPPLY AND LOSS OF THIRD POINT TEEDWATER 1HDL-LS24A LINE BROKEN LINE ON THE STANDPIPE WILL SECOND POINT HEATER DRAIN SUPPLY LINES HEATINC. SLIGHT REDUCTION IN FEED-1HDL-LS6A CAUSE THE PRESSURE TO DROP. TO THIRD POINT HEATER ISOLATED. WATEM TEMPERATURE. REACTOR CODIANT ~
IHDL-LT4A ALL INSTRUMENTS SENSE A EXTRACTION STEAM TO THIRD POINT HEATER TEMFERATURE SLIGHTLY REDUCED. 1HDL-LT24A HIGHER LEVEL THAN ACTUAL ISOLATED (IDSM-LV75A, 1HDL-LV5A, IESS-HEATER LEVEL. MOV22A). OPENS THIRD POINT HEATER DRAIN LINE TO CONDENSER (INDL-LV24A). . REFERENCE INSTP!HENT SENSES CONSTA 5T IF A FALSE LOW SIGNC. IS GENERATED, NO LOSS OF THIRD POINT FEEDWATER HEATING. LINE PLUGGED PRESSURE AT REFERENCE LI5E. IMMEDIATE EFFECT. IF A FALSE HIGH SLIGHT REDUCTION IN FEEDWATER TEMPERA-I M CCURATE SWITCH OPERATION SIGNAL IS GENERATED, SEE " REFERENCE TURE. REACTOR COOLANT TEMPERATURE MAY GENERATE A FALSE HIGH LINE BROKER," THIS INSTRUMENT LINE. SLIGHTLY REDUCED. OR LOW LEVEL SIGNAL. E: h "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMIAR 4 h e INSTRUMENT LINE 24 THIRD POINT FREDWATER HEATER LEVEL INSTRIPENTATION REFERENCE LINE , PAGE 1 0F 1 12-1521:e (A-29) ik , it . L : t ;
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APPENDIX A RIVER BEND COMMON SENSOR FAILttE e FAILURE TYPE COMMON TAP (BROKEN OR
- SYSTEM ID EFFECT ON RPV WATER LEVEL, SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER HDL 1HDL-LS10A VARIABLE IF LEVEL IS ABOVE BROKEN FEEDWATER SUCTION PRESSURE REDUCED. SLIGHT DECREASE IN FEEDWATER FLOW, 1HDL-LS24A LINE BROKEN LINE, STANDPIPE AT A LOWER THIRD POINT HEATER DRAIN PUMP TRIPS. REESTABLISHED VIA FEEDWATER FIDW 1HDL-LS6A LEVEL THAN THE HEATER. REDUNDANT DRAIN PUMP AVAILABII. CONTROL VALVES.
1HDL-LTI.A ALL INSTRUMENTS ON STAht-1HDL-LT24A PIPE SENSE LOWER LEVEL THAN ACTUAL HEATER LEVEL. IF LEVEL IS BELOW BROKEN MOISTL1tE SEPARATOR DRAIN SUPPLY TO IDSS OF THIRD POINT FEEDWATER HEATING. LINE, IT CAUSES STANDPINE AND SECOND POINT HEATER DRAIN SLIGHT REDUCTION IN FEEDWATER TEMPERA-PRESSURE TO DROP. ALL SUPPLY TO THIRD POINT HEATER TURE. REACTOR COOLANT TEMPERATURE INSTRLHENTS ON STANDPIPE ISOLATED (IDSM-LV75A, lHDL-LV54). SLIGHTLY REDUCED. SENSE HIGHER IEVEL THAN EXTRACTION STEAM TO SECOND POINT ACTUAL EATER LEVEL. HEATER ISOIATED (1ESS-MOV22A). OPENS 11tIRD POINT HEATER DRAIN LINE TO " CONDENSER (1HDL-LV24A). VARIABLE INSTRUMENT SENSES CONSTANT FEEDWATER SUCTION PRESSURE REDUCED. SLIGHT DECREASE IN FEEDWAThat FLOW, LINE PLUGGED PRESSURE AT VARIABLE LINE. IF A FALSE LOW LEVEL SIGNAL IS GENER- REESTABLISHED VIA FEEDWATER FIDW INACCURATE SWITCH OPERATION ATED. THIRD POINT HEATER DRAIN PUMP CONTROL VALVES. REACTOR COOLANT MAY GENERATE A FALSE HIGH TRIPS. IF A /ALSE HIGH LEVEL SIGNAL TEMPERATURE SLIGHTLY REDUCED ON FALSE OR LOW LEVEL SIGNAL. IS GENERATED, SEE " REFERENCE LINE HIGH SIGNAL (SEE " REFERENCE LINE BROKEN," LINE 24 BROKEN," LINE 24). NOTE: "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMIIAR 4 INSTRUMENT LINE 25 TRIAD POIlrr FEEDWATER EEATER IAVEL INSTRLMDITATION VARIABIA LINE PAGE I 0F 1 12-1521:e (A-30) f $ ( '
V 3, APPENDIX A 'e' RIVER BEND CCMMON SENSOR FAILURE i FAILURE TYFE CO?ct0N TAP (BROKEN OR SYSTEM ID SENSOR MPL EFFECT ON RPV WATER LEVEL, PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR PCSIR HDL IMDL-LS9A REFERENCE A BREAK IN ANY REFERENCE RADWASTE PIBOILER AND STEAM SEAL LOSS OF FOURYri POINT FEEDWATER IMDL-LS23A LINE BROKEN LINE ON THE STANDPIPE WILL EVAPORATOR DRAIN SUPPLT LINES TO HEATING. SLIGHT REDUCTION IN IEED-IMDL-LT2A CAUSE THE PRESSURE TO DROP. FOURTH POINT HEATER ISOLATED WATER TEMPERATURE. REACTOR COOLANT IHDL-LT23t ALL INSTRUMENTS SEhJE A (IDTM-LVYI87 AND 189). EXTRACTION TEMPERATURE SLIGHTLY REDUCED. HIGh1R LEVEL THAN ACTUAL STEAM TO FOURTH POINT HEATER HEATEP LEVEL. ISOLATED (IESS-MOVISA). OPENS FOURTH POINT HESTER DRAIN LINE TO CONDENSER (INDL-LV23A). REFERENCE INSTRUMENT SENSES CONSTANT IF A FALSE IDW SIGNAL IS GENERATED, NO LOSS OF FOURTH POINT FEECWATER LIhE PLUGGED PRESSURE AT REFERENCE LINE. IMMEDIATE EFFECT. IF A FALSE HIGH HEATING. SLIGHT REDUCTION IN FEED-INACCURATE SVITCH OPERATION SIGNAL IS GENERATED. SEE " REFERENCE WATER TEMPERATURE. REACTOR COOLANT MAY GDIERATE A FALSE HIGH LINE BROKEN," THIS INSTRUMENT LINE. . TEMPERATURE SLIGHTLY REDUCED. OR LOW LEVEL SIGNAL. NOTE: "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMILAR INSTRUMENT LINE 26 FOURTM POINT FEEDWATER HEATER IEVEL INSTRl2EENTATION REFERENCE LINE PAGE 1 OF 1 12-152It s (A-31)
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RIVER BEND COMMON SENSOR FAILURE FAILLE TYPE COMMON TAP (BROKEN OR EFFECT ON RPV WATER LEVEL, SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSURE OR POWER
.HDL INDL-LS9A VARIABLE IF LEVEL IS ABOVE BRorEN NONE NOME lHDL-LS23A LINE BROKEN LINE, STANDPIPE AT A LOWER IMDL-LT2A LEVEL THAN THE HEATER.
1HDL-LT2 3 A ALL INSTRUMENTS ON STAND-PIPE SENSE LOWER LEVEL THAN ACTUAL HEATER LEVEL ' IF LEVEL IS BELOW BRO ~EN RADWASTE REBOILER AND STEAM LOSS OF FOURTH POINT FEELNATER
- LINE, IT CAUSES STANDPIPE SEAL EVAPORATOR DMIN SUPPLY LINES FLATING. SLIGHT REDUCTION IN FEED-PRESSURE TO DROP. AII TO FOURTH POINT HEATER ISOLATED WATER TEMPERATURE. REACTOR CODIANT INSTRUMENTS ON STANDPIPE (IDTM-LVYlP7 E*"5 199). TEMPERATURE SLIGHTLY REDUCED.
SENSE HIGHER LEVEL THAN EXTRACTION STEAM TO FOURTH PGINT ACTUAL HEATER LEVEL. HEATER 150 LATED (1ESS-MOV15A)- OPENS FOURTH POINT HEATER DRAIN LINE TO CONDENSER (IHD2-LV23A). VARIABLE INSTRUMENT SENSES CONSTANT IF A FALSE LOW SIGML IS GENERATED LOSS OF FOURTH POINT FEEDWATER LINE PLUGGED PRESSURE AT VARIABLE LINE. NO IMMEDIATE EFFECT. IF A FALSE . HEATING. SLIGHT REDUCTION IN FEED-INACCURATE SWITCH OPERATION HIGH SIGNAL IS GEST. RATED, SEE WATER TEMFERATURE. REACTOR COOLANT MAY GENERATE A FALSE HIGH " REFERENCE LINE EROKEN," LINE 26. TEMPERATURE SLIGHTLY REDUCED. OR LOW LEVEL SIGNAL. FOTE: "A" SIDE INSTRUMENTS LISTED, "B' SIDE SIMILAR e e INSTRUMENT LINE 27 FOURTH POINT FEEDWATER MEATER 12 VEL INSTRlRENTATION VARIABIE LINE PAGE I 0F I 12-1521:e (A-32) y 1.pe - . .- <- :.
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FAILURE TYPE COMMON TAP (BROKEN OR EITECT ON RPV WATER LEVEL, SYSTEM ID SENSOR MPL PLUGGED) PRIMARY EFFECT SECONDARY EFFECT PRESSutE OR POWER HDL IHDL-LSIA REFERENCE A BREAK IN ANY REFERENCE LOW PRESSURE HEATER STRING "A" LOSS OF I STRING OF LOW PRESSURE IMDL-LS7A LINE BROKEN LINE ON THE STANDPIPE WILL ISOL4TED, (ICNM-MOV32A,33A) HEATER FEEDWAIER HEATERS. TURBINE RUNBACK CAUSE THE PRESSURE TO DROP. BYPASS VALVE OPENED (ICNM-MOVI36). TO 70% LOAD. RECIRC RUNBACK SIGNAL ALL INSTRUMENTS SENSE A TURB;NE CONDENSER NECK RUNBACK INITIATED. HIGHER LEVEL THAN ACTUAL CIRCUIT ACTUATED. HEATER LEVEL. REFERENCE INSTRUMENT SENSES CONSTANT IF A FALSE LOW SIGNAL IS GENERATED, NO LOSS OF SIXTH P0 INT FEEDWATER HEATING. LINE PLUGGED PRESSURE AT REFERENCE LINE. IMMEDIATE EFFECT. IF A FALSE HIGH SLIGHT REDUCTION IN FEEDWAIER TEMPERA-INACCURATE SWITCH OPERATION SIGNAL IS GENERATED, SEE " REFERENCE TURE. REACTOR C00! ANT TEMPERATURE MAY GENERATE A FALSE HIGH LINE BROKEN," THIS INSTRUMENT LINE. SLIGHTLY REDUCED. TURBINE AND RECIRC OR LOW LEVEL SIGNAL. RUNBACKS INITIATED (SEE " REFERENCE LINE BROKEN," THIS LINE). NOTE: "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMILAR 1 INSTRUMENT LINE 28 SIXTM POINT IEEDWATER MEATER I2 VEL INSTRIMENTATION REFERENCE LINE PAGE 1 OF I 12-152It s (A-33)
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' FAILURE TYPE COMMON TAP (BROKEN OR EFFECT ON RPV WATER LEVEL, SYSTEM ID SENSOR MPL PLUCCED) PRIMARY EFFECT - SECONDARY EFFECT PR'!SSURE OR POWEA HDL IHDL-LSIA VARIABLE IF LEVEL IS ABOVE BROKEN NONE NONE 1HDL-LS7A LINE BROKEN LINE, STANDPIPE AT A LOWER LEVEL THAN THE HEATER.
ALL INSTRLhEhTS ON STAND-PIPE SENSE LOWER LEVEL THAN ACTUAL HEATER LEVEL. i IF LEVEL IS BELOW BROKEN. LOW PRESSURE HEATER STRING "A" LOSS OF I STRING OF IDW PRESSURL LINE. IT CAUSES STANDPIPE ISOLATED (ICNM-MOV32A,33A), Fl W R FEEDWATER HEATERS, TURBINE RUNBACK PRESSURE TO DROP. ALL BYPASS VALVE OPENED (ICNM rvtM ). TO 70% LOAD, RECIRC RUNBACK SIGNAL INSTRUMENTS ON STANDPIPE TURBINE CONDENSER NECK RUNB EK INITIATED. SENSE HIGHER LEVEL. CIRCUIT ACTUATED. VARIABIE INSTRUMENT SENSES CONSTANT IF A FALSE LOW LEVEL SIGNAL IS GENER- SAME AS " REFERENCE LINE BROKEN," LINE PLUGGED PRESSURE AT VARIABLE LINE. ATED, NO IMMEDIATE EFFECT. IF A FALSE. LINE 28. INACCURATE SWITCH OPERATION HIGH LEVEL SIGNAL IS GENERATED, SEE MAY GENERATE A FALSE HIGH "REF'.RENCE LINE BROKEN," LINE 28. OR LOW LEVEL SIGNAL. NOTE: "A" SIDE INSTRUMENTS LISTED, "B" SIDE SIMILAR
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PAGE 1 0F 1 12-1521 a (A-34) I -
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'e APPENDIX A , ,N I RIVER BEND COMMON SENSOR FAILURE
' FAILURE TYPE
. COMMON TAP (BROKEN OR EFFECT ON RPV VATER LEVEL, SlSTEM ID SENSOR MPL PLUGGED) PRIMRY EFFECT SECONDARY EFFECT PRESSURE OR POWER DTM IDTM-LS189 REFERENCE - A BREAK IN ANY REFERENCE EXTRACTION STEAM SUPPLY (IMSS-MOV155) NEGLIGIBLE LOSS OF FEEDWATER HEATING IDTM-LS192 LINE BROKEN LINE ON STANDPIPE WILL AND MAIN STEAM SUPPLY TO STEAM SEAL AT FOURTH POINT. HEATER.
IDTM-LT189 CAUSE PRESSURE TO DROP. EVAPORATOR IS0!ATED (1ESS-MOV112). IDTM-LT190 ALL INSTRUMENTS SENSE A HICHER LEVEL THAN ACTUAL DRAIN RECEIVER LEVEL. * ' REFERENCE INSTRUMENT SENSES CONSTANT IF A FALSE LOW SIGNAL IS GEhERATED, NO NEGLIGIBLE LOSS OF FEEDWATER HEATING l.INE PLUGGED PRESSL'RE AT REFERENCE LINF. IMMEDIATE EFFECT. IF A FALSE HIGH AT FOURTH POINT HEATER. INACCURATE SWITCH OPERATION SIGNAL IS GENERATED, SEE " REFERENCE MY GENERATE A FALSE HIGH LINE BROKEN," THIS INSTRUMENT LINE. OR LOW LEVEL SIGNAL, t 5 INSTRUMENT LINE 30 STEAM SEAL EVAPORATOR DRAIN EECEIVER LEVEL INSTRUMENTATION REFERENCE LINE PAGE 1 OF 1 12-152113 (A-35)
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