ML20236J133
| ML20236J133 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/16/1998 |
| From: | Dobbs G, Risner B, Williams B ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20236J126 | List: |
| References | |
| 97-R-2015-01, 97-R-2015-01-R01, 97-R-2015-1, 97-R-2015-1-R1, NUDOCS 9807080059 | |
| Download: ML20236J133 (200) | |
Text
{{#Wiki_filter:- ENCLOSURE 1 l Engineering Report 97-R-2015-01, PPSResponse to Failure ofa DCBus i l l 737 28 u M PoE PM 6s ! e L '
w>ms As si at u ou I ORM TITLE: FORM NO. REV. ENGINEERING REPORT DATA SHEET 5010.017- ATT-2 1PC-1 Report No.: 97-R-2015-01 Unit: ANO-2 Catego T: Q Report
Title:
PPS Response to failure of a DC Bus System (s): PPS. ES. RPS. 2 A. 2D. 2Y Topic (s): LOOP DBAA. EDSF. SFAA Component No(s). 2C23 Plt Arca: Bldg. 2AB Elev. 2C40 2C39 Room: Wall 2C15 Coordinates: Abstract (Included Purpose /Results)- This report establishes the design bases for a modified plant response to failure of a DC bus (FODCB). This analysis of the existing design and resulting plant response defines the FODCB issues. The analysis of the proposed modified design and resulting plant response establishes the bases and justification for the modifications. For the FODCB as an accident initiator and as a failure with an accident, this report demonstrates GDC and IEEE 279 compliance. Reference section titled ISSUES WITH EXISTING RESPONSE Reusion No: O Config. Checklist (per 5010.004) completed? O Yes 13 No Pages Revised and/or Added: All hirpose of Revision: Onginal issuc Imtiatmg Documents Resulting Documents Kev Design input Documents CR-2-WO293 Supersedes Report (s): nonc B): Burl E. Williams / d //jf 9g Rnt'd ,
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_/ Chk'd. ABB CE ref__ATT 14 / / ._ Chk'd: Brad Risner * / r23.ut / f f[,
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Apv'd: Glen Dobbs* _,,.,,,,/_,,fjA[ / 2/[j Apv'd: Keith Nichols / d[ / 2/(14[,99 (Print Name) dinitials) ( ate) (Print Name) (Initials) Date) l *For Plant Power Distnbution Review Check if Additional Revisions: O DOCUMENT RECORD TYPE (Refer to Procedure Snlo 005)
ARXANN Ah NL C1.1,AR ONE FORM TITLE: FORM 10. REV. ENGINEERING REPORT COVER SHEET 5010.017A 1 i 8 Quality Assurance Record O NOT a Quality Assurance Record SYSTEM / COMPONENT CLASSIFICATION: eo O NON-Q ENGINEERING REPORT FOR ARKANSAS NUCLEAR ONE RUSSELLVILLE, ARKANSAS 0 8/13/97 Original Issue g(d M [y REV DATE REVISIONS BY CIIECK APPR TITI.E: REPORT NO: , PPS Response to Failure of a DC Bus 97-R-20lS-01
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Engi;eerirg Report 97.R-2015-01 Pege1 INDEX INDEX..................................................................................................................................................1 SCOPE.................................................................................................................................................4 OBJECTlVES.......................................................................................................................................4 OVERVIEW..........................................................................................................................................4 ISSUE......................................................................................................................................4 MODIFICATIONS.........................................................................................................5 S U M M A R Y O F R E S U LT S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXISTING PLA NT RESPO NS E TO FAILU RE O F A DC B US (FO DCB) ......................... ...... .. .. ....... ..... ... ..... 5 TABLE 1. . . . .8 Existing Measurement Channel Response To FODCB . . ..8 ISSUES WITH EXISTING RESPONSE . . . . .9 M O DIFI ED P LANT RESPO NS E TO FO DC8 . ........ ... ... ... ... ....... .... .......... .. ...... ... .. . . ... ... 11 Table 2.. . . . . . . . . . .14 Modified Measurement Channel Response To FODCB . , , . .14 ASSUMPTIONS.................................................................................................................................15 D E T A l L D I S C U S S lO N . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXISTIN G ESFAS RESPONS E TO Tile FO DCB SCEN ARIO.. ..... . . ......... . .................... ............. ........... ... 15 ESFAS ACTUATION OF ACCIDENT MITIGATION EQUIPMENT.. . .15 TABLE 3. . . .17 EFW Flow Paths to SGs.. . . 17 TRIP PATH INITIATION . . . . . . .19 MATRIX LOGIC.. . . . . .19 TRIP CHANNEL BYPASS LOGIC. . . . .19 MEASUREMENT CHANNEL. . . . . . . . 21 M O D I FI E D ES FAS R ES PO N S E TO FO D C B .. . . .... ... ...... . .. ...... ..... ...... . ............................. . ..... . . ... 28 MODIFIED MEASUREMENT CHANNEL LOGIC. . . . . . .. 28 MODIFIED MEASUREMENT CHANNEL EVALUATION. .. .. . 30 MODIFIED INSTRUMENT LOOP RESPONSE.. , . . . . 31 ESFAS MATRIX LOGIC EVALUATION., . . . . . . . . .. . . 36 TRIP CHANNEL BYPASS LOGIC. . . . . . . . . 36 TRIP PATil INITIATION EVALUATION.. . . . . 36 MODIFIED EFAS ACTUATION EVALUATION. . . . . 37 i TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 l
Engi cering Report 97-R-2015-01 P:ge 2 OPTIONS TO IMPLEMENT MODIFIED LOGIC.. .38 TABLE 4 . . .
. . 39 EFW Flow Paths to SGs- . . .- . . . 39 RPS RES PONS E TO TH E FO DCB SCENARIO .. ..~.. ....... .. . . ...... ..... . ..... ~. . ...--. -~~ ~ ~. 40 BEFORE MODIFICATIONS.. .
. . 40 RPS TRIP CIRCUIT BREAKERS.. . 40 l . .
TRIP PATil INITIATION . .. .40 l TRIP CilANNEL BYPASS LOGIC . . 41 ! MEASUREMENT CIIANNEL . .. . . . . . .. . 42 RPS TRIP CIRCUIT BREAKERS AFTER MODIFICATIONS.. . . . . .. . 44 TRIP PATH INITIATION AFTER MODIFICATIONS.. . . . . 44 TRIP CIIANNEL BYPASS LOGIC. , . 45 MEASUREMENT CliANNEL AFTER MODIFICATIONS . . . . 46 DECREASE IN SUSCEPTIBILITY TO SINGLE PO'NER DIVISION LOOP....................................... 48 C O N C LU SIO N S AN D R ECOM M EN DATIO N S .................................................................................. 49 REFERENCES...................................................................................................................................51 ATTACIIMENTI..................................................................................................-....~.~...~..-~.~..~.~.-.......54 EXISTING EFW POWER SOURCES. TRIP PATilS. & ACTUATION RELAYS.. . .54 ATTACilMENT2..............................................................................................~.......~.....~.........55 MODIFIED EFW POWER SOURCES, TRIP PATliS. & ACTUATION RELAYS.. . . 55 ATTACilMENTJ............................................................................................................................~..........56 Deleted . . .56 ATTAClIMENT4.....................................................................................................~..-.......-..~.....--.57 2C39 EFAS Actuation Logic.. . .57 ATTACIIMENT5.........................................................................................................................................58 Modified EFAS Logic.. .58
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ATTACIIMENT6...~...........................................................................................................................................60 l EXISTING POWER DISTRIBUTION SKETCII . . 60 ! ATTACIIMENT7.........................................................................................................................61 BACK UP CONTROL POWER SKETCII. . 61 ATTACIIMENT8...........................................................................................................................62 ! TS BASES INSTRUMENTATION.. .62 ATTACliMENT9.......................................................................................................64 3 TABLE 3.31. .. . . . 64 i REACTOR PROTECTIVE INSTRUMENTATION. .64 i l ATTAClIMENTto.................................................................................................................71 TS TABLE 3.3 3., , , .71 TITLE: REPORT NO: j PPS Response to Failure of a DC Bus 97-R-2015-01 I
Engineerire Report 97-R-2015-0i Page 3 ENGINEERED SAFETY FEATURE ACTUATION SYSTEM INSTRUMENTATION . . . . . . . . . . . . 71 ATTA Cli M ENT 1 I . .. ... . .... . .. . .. ... . ... .. .... . . . ... .. 77 Deleted . . . . .. . 77 A TTA C il M E N T I 2 . ............ .. ......... . . ...... .......... . . ...... .. ........ ..... ... ...... .. .... ....... .... ... . 78 j PPS FAILURE MODES AND EFFECTS ANAL.YSIS. . . . .. . . . 78 A TTA Cil M E N T l 3 .. . .. ........ ...... . . ...... ... ... ........... ......... . ... ..... .. .. ........ ..... ............. . .. . ... . 16 i MODIFIED PPS FAILURE MODES AND EFFECTS ANALYSIS... . . . .. .. .. 161 A TTA C H M E N T I 4 ........ . .. ........ ................. ....... .. . ... ....... . . ... ... ...... . . ... . .. . 169 t ABi3 CE REVIEW. . . . . 169 l l l l 3 l l f TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 2
EegineeriIg Report 97-R-2015-01 P:ge 4 l l SCOPE This report documents the consequences of failure of a safety related DC bus for the existing plant design and for
. the proposed corrective modifications.
L l OBJECTIVES This repon establishes the design bases for a modified plant response to failure of a DC bus (FODCB). This l andysis of the existing design and resulting plant response defines the FODCB issues. The analysis of the proposed modified design and resulting plant response establishes the bases and justification for the modification. For the FODCB as an accident initiator and as a failure with an accident, this report demonstrates GDC, IEEE 279 compliance, and RPS and ESFAS TS compliance. 1 OVERVIEW ISSUE EIC design engineering at ANO identified that a failure of a DC bus (FODCB) could result in unacceptable plant
.c response. The assumed loss of off site power (LOOP) combined with the FODCB can result in loss of power to one division (train) including 125 VDC,120 VAC ((2RSI and 2RS3) or (2RS2 and 2RS4)),4160 VAC,480 VAC and 6900 VAC. The failure of two channels of vital instmment power was not completely considered in the PPS design bases for each ESFAS function. Failure of two power channels associated with each power division indicates those functions with an increasing signal setpoint could be rendered inoperable by failure of two measurement channels. Impact on ESFAS functions is summarized in the following table.
I ESFAS Function Channel Bypassed
- No Channel Bypassed CIAS Fails inoperable Functions as required CSAS Fails inoperable Functions as required Functions as required )
SI AS - Containment Pressure Fails to actuate (3) SlAS - RCS Pressure Functions as required Functions as required RAS Functions as required Functions as required EFAS Fails inoperable Functions as required (1) CCAS - _ Containment Pressure Fails inoperable (3) Functions as required CCAS - RCS Pressure Functions as required Functions as required j l MSIS Functions as required (2) Functions as required (2)
- Channel bypassed on operable power division.
(I) EFAS level control logic disabled for loss of Division I only. Operator control of SG level required. (2) The feed only good generator logic is impaired ;f red DC is lost but this is consistent with the MSLB analysis and Standard Review Plan. (3) The SIAS and CCAS ftmetions are still satisfied via the RCS pressure input. TIT 1.E: REPORT N0: PPS Response to Failure of a DC Bus 97-R-2015-01 i
Ecgineerirg Report 97-R 2015-01 P ge 5 MODIFICATIONS At the time that ANO-2 made the submittal for Amendment 159 of the Technical Specifications, it was believed, based upon a review of the transient and accident analysis and the ESFAS design, that the bypass of a specific protection channel combined with a single failure would not prevent the required protective action. As indicated in the above table, that was not the case for all functions (CSAS, CIAS, EFAS, SIAS from containment pressure). Modifications to correct the ESPAS response to a FODCB with a channelin bypass are:
- 1. delete auctioneered power source for channel A and D bistable power supplies,
- 2. provide selective open and close logic for EFASI and EFAS2 valves (interposing relays), and 3 provide selective logic to the MSIS signal to close EFASI and EFAS2 valves (interposing relays).
For those ESFAS function requiring an increasing signal to actuate, these modifications with a FODCB will cause ESFAS logic to become 1-out-of-l with a channel bypassed in the non-faulted division or 1-out-of 2 with no channel bypassed. ESFAS functions with decreasing signals and RPS response to FODCB are not impacted by these modification. These modifications will not create any new failure modes at the system level, in addition to the modifications a future enhancement to provide automatic backup control power for the offsite switchgear (2Al,2A2, 2111, and 2112) will be logged in the system engineering note book.
SUMMARY
OF RESULTS EXISTING PLANT RESPONSE TO FAILURE OF A DC BUS (FODCB) FODCB SCENARIO CAUSE: Positive leg (+) to negative leg (-) fault of the DC circuit at any point between the battery and the DC bus output breakers. (No credit taken for the fuses in the meter and relay cabinet) EFFECT: Loss of DC voltage to ONE power train. Loss of Vital AC to 2RSI and 2RS3 (2D01) or to 2RS2 and 2RS4 (2D02) CONSEQUENCES: Assumpuons: EDG not in-service (standby). (2A308 and 2A408 open) Unit Aux Transformer Feeding 2Al and 2A2 (2Ai12 and 2A212 closed) FODCB causes turbine or generator trip
- 1. Loss of control voltage to 2Al or 2 A2 results in failure of one bus to transfer to Startup Transformer #3 (SU3).
- 2. 2111 and 2112 fast transfers to SU#3. Loss of control voltage to 2111 or 2112 load breakers tesults in loss ofload protective circuit functions and loss of trip capability. Fast bus transfer is functional since the feeder DC control power is diverse from the load breakers for containment penetration protection. (Note: obviously 11 buses would be deenergized with a LOOP present)
- 3. Safety bus. 2A3 or 2A4. is de-energized with individual breaker state remaining "as is" due to loss of control voltage and de-energization of 2AI or 2 A2.
TITLE: REPORT NO: l __ PPS Response to Failure of a DC Bus 97-R-2015-01 l l l
Engineering Report 970201541 Page 6
- 4. Associated EDG does not start due to loss of control voltage.
- 5. Vital AC buses (2RSI and 2RS3) or (2RS2 and 2RS4) are de-energized. DC and AC inputs to the two inverters associated with the faulted power division are deu sind.
- 6. Per t'alminhaa 97-E-0028 01 certain instrumentation loads in 2C15,2C23,2C39, and 2C40 are transferred to the pan-faulted sital AC buses.
6.1 2C15. RV!T ;cvel and SG level primary instrument loops for channel B or C remains energized. Channel A or D de-energize. RWT level instrument loops (B, C, and D) or (B, C, and A) outputs renmin functional SG level output to the PPS fails low for channels (A and C) or (B and D). Existing PPS input is front secondary instrument loop which has a single power source. 6.2 2C23 Channal A bastable and bypass loads are transferred from 2RSI to 2RS2 Channel C bistable and bypass loads are transferred from 2RS3 to 2RS4 or Channel B bistable and bypass loads are transferred from 2RS2 to 2RSI Channel D bistable and bypass loads are transferred from 2RS4 to 2RS3 6.3 2C39 ARC loads transfer between 2RSI and 2RS2. 6.4 2C40 ARC loads transfer between 2RS3 and 2RS4.
- 7. PPS Measurement Channel 7.1 With the exception of RWT level channels B and C, instrument loops for channels (A and C)or(B and D) fait low.
7.2 With the exception of RWT bistables B and C, bistables with decreasing setpoints trip for channela (A and C) or (B ard D). 7.3 Measurement channels with incter. sing setpoints fail inoperable for channels (A and C) or(B and D)
- 8. PPS Matrixlogic 8.1 With the excepison of RAS and ETAS, those ESFAS functions with decreasing serpoints are actuated by the AC or BD murix. 9 AS remains functional with 1 out of 3 logic. Ref Table 1 for details. EFAS channels A and C are blocked by FOGG logic that requires and increasing signal.
8.2 hose ESFAS functions with increasing seapoints including EFAS fail to an inoperable state for channels (A and C) or (B and D). Reference Table 1 for details. 3 TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-41
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Engineering Repor197 R-2015-01 Pcge 7 9 PPS Initiation Logie (TPI and TP3) or (TP2 and TP4) trip due to power supply de-energization
- 10. ' ESFAS Actuation Logic ((TPl or TP3) and (TP2 or TP4))
10.1 2C39 half-leg actuation with one EFASI, one EFAS2 and one MSIS interposing relays actuated. , 10.2 2C40 half-leg actuation with one EFAS1, one EFAS2 and one MSIS interposing relays actuated. I 1. ESFAS Mitigation Equipment (reference Table 1) 11.1 Faulted train de-energized. I1.2 Non-faulted train Except for RAS. functions with decreasing signals actuate. RAS remains functional with 1-out-of 3 logic.. Functions with increasing signals rendered inoperable.
- 12. RPS Logic ((TPI or TP2) and (TP3 or TP4))
12.1 Matrix AC or BD trip initiates Rx inp 12.2 (TPI and TP3) or (TP2 and TP4) de-energization causes RX trip 12.3 Loss of DC to channels I and 3 or channels 2 and 4 trip circuit breakers results in reactor trip. The fail safe design of the reactor trip breakers ensures the breakers trip with loss of DC input. Note DC for channels 3 and 4 powered by battery eliminators that are powered from 2RS3 and 2RS4. I TITLE: REPORT NO: j PPS Response to Failure of a DC Bus 97-R-2015-01
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Engineering Report 97-R-2015-01 Page 9 ISSUES WITH EXISTING RESPONSE The PPS is designed and constmeted in accordance with various regulatory design requirements and practices as described below. Those requirements of particular interest to the condition addressed by this report are italicized. The PPS is required to meet the following GDC criteria of Appendix A,10 CFR 50, July 1971; l A) GDC 21, Protection System Reliability and Testability, requires that the protection system shall be designed for high functional reliability and inservice testability commensurate with the safety functions to be performed. Redundancy and independence designed into the protection system shall be sufficient to assure that (1) no singlefailure restdts in loss of the protectionfunction, and (2) removalfrom service of any component or channel does not result in loss of the required minimum redundancy. B) GDC 22, Protection System Independence, requires that the protection system shall be designed to assure that the effects of normal operating, maintenance, and testing on redundant channels do not result in loss of the protection function, or shall be demonstrated to be acceptable on some other defined basis. Design techniques, such as functional diversity or diversity in component design and principles of operation, shall be used to the extent practical to prevent loss of the protection function. C) GDC 23, Protection System Failure Modes, requires that the ESFAS and RPS shall be designed tofailinto a safe state or into a state demonstrated to be acceptable on some other defined basis. D) GDC 24, Separation of Protection and Control Systems, requires that the protection system shall be separated from control systems to the extent that failure of any single control system component or channel, or failure or removal from service of any single protection system component or channel which is common to the control and protection systems leaves intact a system satisfying all reliability, redundancy, and independence requirements of the protection system. Interconnection of the protection and control systems shall be limited so as to assure that safety is not significantly impaired. The ESFAS and RPS are required to meet the single failure criterion ofIEEE 279-1971 to the extent that: A) Any singlefailure within the . system shall not prevent properprotective action at the system level. B) No singlefailure willdefeat more than one of thefourprotecnve channels associated with any one tripfunction. IEEE 279-1971 also requires that ESFAS and RPS meet the following:
- A) All protection system channels shall be designed to maintain necessary functional capability under extremes of conditions (as applicable) relating to malfunctions.-
TITLE: REPORT NO:
' PPS Response to Failure of a DC Bus 97-R-2015-01
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Engineering Repod 97-R-2015-01 Pzge 10 l B) Channels that provide signals for the same protective function shall be independent and physically separated. C) Any equipment utilized for both protective and control functions shall be classified as
. pan of the protective system and shall meet all the specific requirements (such as isolation devices, single random failure and multiple failures resulting from a credible single event).
D) The protection sy.ctem inputs shall be derived from rignals that are direct measures of the desired variables to the extent feasible and practical. E) The system shall be designed to permit any one charmel to be maintained and, u hen required, tested or calibrated duringpower operation without initiating a protective action at the system level. During such operation, the active parts of the system . shall, of themselves, continue to meet the singlefailure criterion. l F) Where operating requirements necessitate automatic or rnanual bypass of a protective function, the design shall be such that the bypass will be removed automatically whenever permissive conditions are not met. G) Where it is necessary to change to a more restrictive setpoint to provide adequate protection for a particular mode of operation or set of operating conditions, the design shall provide positive means of assuring that the more restrictive setpoint is used (for example, trip setpoint increase / decrease for SG pressure and RCS pressure during plant startup/ shutdown). H) The protection system shall be so designed that, once initiated, a protective action at the system level shall go to completion. Return to operation shall require subsequent deliberate operator action.
- 1) No single failure within the manual, automatic, or common portions of the protection system shall prevent initiation of any protective action by manual or automatic means.
J) The system shall be designed to facilitate the recognition, location, replacement, repair or adjustment of malfunctioning components or modules. K) The protection system equipment shall be identified distinctively as being in the protection system. As summarized in Table 1, cenain ESFAS functions with increasing signal setpoints are rendered inoperable by a FODCB with a measurement channel in bypass. Without a channel in bypass, a red train FODCB requires operator action to prevent overfilling a steam generator. TITI.E: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
' Pzge 11 Ecgineerizg Report 97 R-2015-01 l l MODIFIED PLANTRESPONSE TO FODCB FODCB SCENARIO CAUSE: Positive leg (+) to negative leg (-) fault of the DC circuit at any point between the battery and the DC bus output breakers. (No credit taken for the fuses in the meter and relay cabinet) EFFECT: 1.oss of DC voltage to ONE power train. CONSEQUENCES: f Assumptions: EDG not in-service (standby). (2A308 and 2A408 open) Unit Aux Transformer Feeding 2A1 and 2A2 (2A112 and 2A212 closed) FODCB causes turbine or generator trip
- 1. Loss of control voltage to 2A1 or 2A2 results in failure of one bus to transfer to Startup Transformer #3 (SU3).
- 2. Deleted
- 3. 2H1 or 2H2 fast transfers to SU #3. If transfer fails individual 19ad breaker states remaining "as is" due to loss of control voltage.
- 4. Safety bus,2A3 or 2A4, de-energizes with individual breaker states remaining "as is" due to loss of control voltage.
- 5. Associated EDG does not start due to loss of control voltage.
- 6. Vital AC buses (2RS1 and 2RS3) or (2RS2 and 2RS4) are de-energized. DC and AC inputs to the two inverters associated with the faulted power division are de-energized.
- 7. With failure of the fast transfer to SU#3, certain instrumentation loads in 2C15, 2C23,2C39, and 2C40 are transferred to the non-faulted vital AC buses.
^
7.1 2C15 RWT and SG level primary instrument loops for PPS channel 8 and C remains energized. Channel A and D de-energize. RWT instrument loops (B, C, and D) or (B C, and A) remain functional. SG level output to the PPS fails low for channels (A and C) or (B and D). Existing output to the PPS is from secondary instrument loop which has a single power source. 7.2 2C23 Channel A bypass loads are transferred from 2RS1 to 2RS2 Channel C bistable and bypass loads are transferred from 2RS3 to 2RS4 or Channel B bistable and bypass loads are transferred from 2RS2 to 2RS1 Channel D bypass loads are transferred from 2RS4 to 2RS3. 7,3 2C39 ARC loads transfer between 2RS1 and 2RS2 TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
. Eegineeri g Report 97-R-2015-01 Pige 12 l
l 7.4 2C40 ARC loads transfer between 2RS3 and 2RS4
- 8. PPS Measurernent Channel I
8.1 PPS inputs from instrument loops for channels B and C of RWT remain functional. 8.2 Channel A or D bistables trip for all functions. 8.3 B.istables with increasing setpoints (including EFAS) fail inoperable for I channel C or B. 1 8.4 With the exception of RAS, bistab!es with decreasing setpoints trip for channel C or B. 8.5 Channel Bypass remains functional.
- 9. PPS Matrix Logic 9.1 With the exception of RAS and EFAS, those ESFAS functions with decreasing setpoints are actuated by the AC or BD matrix. RAS logic remains operable with 1-out-of-2 logic (worse case) with an assumed channel bypassed. Reference 9.2 for EFAS logic.
9.2 Those ESFAS functions with increasing setpoints remain in an operable state with two channels operable, one channel tripped, and one channel inoperable. These functions remain operable with 1-out-of-1 logic (worse case) with an assumed channel bypassed. 10 PPS Initiation Logic (TP1 and TP3) or (TP2 and TP4) de-energize to their tripped state due to power supply de-energization. 11 ESFAS Actuation Logic ((TP1 or TP3) and (TP2 or TP4)) 11.1 2C39 half-leg actuation with no EFAS and MSIS interposing relays actuated. 11.2 2C40 half-leg actuation with no EFAS and MSIS interposing relays actuated. 12 ESFAS Mitigation Equipment 12.1 One power train inoperable. 12.2 Non-faulted train Functions with decreasing signal actuate except RAS and EFAS. RAS and EFAS function as required. Functions with increasing signals function as required. 13 RPS Logic ((TP1 or TP2) and (TP3 or TP4)) 13.1 Matrix AC or BD trip initiates Rx trip 13.2 (TP1 and TP3) or (TP2 and TP4) de-energization causes RX trip TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
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r - '-- - - Engineering Report 97-R-2015411 Pzge 13 13.3 Loss of DC to channels 1 and 3 or channels 2 and 4 trip circuit breakers results in reactor trip. The fail safe design of the reactor trip breakers ensures the breakers trip with loss of DC input. Note DC for channels 3 and 4 powered by battery eliminators that are powered from 2RS3 and 2RS4.
.14 Deleted TITLE: REPORT NO:
PPS Response to Failure of a DC Bus 97 R-20154pl
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t Engineering Report 97.R 2015-01 Page 15 ' ASSUMPTIONS
- Offsite power buses feeder breakers,2Al12 and 2A212, closed to align the unit auxiliary l transformer feed to house loads. EDGs are assumed to be in standby with 2A308 and
!. 2A408 open. l Although corrective action by others will eliminate direct tripping of the turbine caused by loss of DC, for conservatism, a turbine / generator trip is assumed. As a result the unit auxiliary transformer loses power. I Loss of DC is considered as an accident initiator, a SAR chapter 15 accident, and as a single failure with other accident initiators. I DETAIL DISCUSSION EXISTING ESFAS RESfY)NSE TO THE F0DCB SCENA RIO Organization of the ESFAS response discussion starts with equipment actuation signals and ends with the measurement channels. Reference Attachments 8 for TS definition of ESFAS: actuation logic, initiation logic, matrix logic, and measurement channel. ESFAS ACTUATION OF ACCIDENT MITIGATION EQUIPMENT ESFAS Actuation = (TPl or TP3) and (TP2 or TP4). ESFAS Actuation = Trip Leg 1/3 and Trip Leg 2/4. ESFAS Actuation in terms of ARC power supplies de-energization = (PS5 and PS6) and (PS7 and PS8). Note De-energization of(PS5 and PS6) or (PS7 and PS8) will actuate a relay subgroup. By substituting the AC sources, ESFAS Actuation for 2C39 = (2RSI and 2RS2) and (2RSI and 2RS2). By substituting the AC sources, ESFAS Actuation for 2C40 = (2RS3 and 2RS4) and (2RS3 and 2RS4). These equations indicate failure of either combination, (2RSI and 2RS3) or (2RS2 and 2RS4) does not result in actuation or failure of the ARC ESFAS Actuation = (TPl or TP3) and (TP2 or TP4) By substituting the power supplies for the TPs, ESFAS actuation = (PS34 or PS40) and (PS37 or PS43) By substituting the AC sources for the power supplies, ESFAS actuation = (2RSI or 2RS3) and (2RS2 or 2RS4)
' These equations indicate failure of either combination, (2RSI and 2RS3) or (2RS2 and 2RS4) results in a halfleg trip of both ARCS.
TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015 41 w_ ______._ _ . _ . _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ . _ _ _ _ _ . _
Engineering Report 97-R 2015-01 Pzge 16 EFAS and MSIS Interposing Relays EFAS or MSIS Interposing Relay actuation = TPl or TP2 for 2C39 EFAS or MSIS Interposing Relay actuation = TP3 or TP4 for 2C40 Without regard to valve initial position, the valve logic for EFAS flow is: For Red Train = (TPl and TP4) For Green Train = (TP2 and TP3) l This logic demands one valve in each EFW flow path must fail in the open position. l Reference Table 3 and Attachment I for additionalinformation. TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
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Engineeri5g Report 97-R-2015-01 P2ge 19 TRIP PATil INITIATION Actuations of the trip paths in terms of Matrix relays is: TPl = ABl or ACI or ADI or BC1 or BDI or CD1 TP3 = AB3 or AC3 or AD3 or BC3 or BD3 or CD3 TP2 = AB2 or AC2 or AD2 or BC2 or BD2 or CD2 TP4 = AB4 or AC4 or AD4 or BC4 or BD4 or CD4 l In terms of de-energizing the matrix power supplies and AC sources the TP logic is: i TPl = TP3 = PS21 or PS27 or PS28 or PS22 or PS29 or PS23 TP2 = TP4 = PS24 or PS25 or PS30 or PS26 or PS31 or PS32 TPl = TP3 = 2RSl or 2RS3 TP2 = TP4 = 2RS2 or 2RS4 These equations indicate failure of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) results in a halfleg trip of both ARC. MATRIX LOGIC in terms of matrix and matrix power supplies, ESFAS actuation = AB or AD or AC or BC or BD or CD ESFAS actuation = ((PS21 and PS24) or (PS27 and PS25) or (PS28 and PS30) or (PS22 and PS26) or (PS29 and PS31) or (PS23 and PS32)) In terms of de-energization of the AC sources for the matrix power supplies, ESFAS actuation = (2RSI and 2RS2) or (2RS3 and 2RS4). These equations indicate failure of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4), does not result in an ESFAS actuation or failure. TRIP CIIANNEL HYPASS LOGIC Bypass Power Supplies Auctioneering BYPASS 2RSI l l 2RS3 l l 2RS2 l 2RS4 CIIANNEL A PS49 AND PS51 CHANNEL B PS50 AND PS52 CHANNEL C PS53 AND PS55 CHANNEL D PS54 AND PS56 TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
Engireerirg Report 97-R-2015-01 Prge 20 in terms of channel bypass and bypass power supply failure, ESFAS actuation = AB or - AD or AC or BC or BD or CD. (Assumes non-bypassed channel tripped) ESFAS actuation = ((PS49 and PS51 and PS50 and PS52) or (PS49 and PS51 and PS54 and PS56) or (PS49 and PS51 and PS53 and PS55) or (PS50 and PS52 and PS53 and PSS5) or(PS50 and PS52 and PS54 and PS56) or(PS53 and PS55 and PS54 and PS56)) In terms of de-energization of the AC sources for the bypass power supplies, ESFAS ~ actuation = (2RS1 and 2RS2) or (2RS3 and 2RS4). (Assumes non-bypassed channel tripped). These equations indicate de-energization of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) will not result in tripping of a bypassed channel. i l- TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97 R-2015-01
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r { Engineering Report 97-R-2015-01 Page 28 I MODIFIED ESFAS RESPONSE TO FODCB MODIFIED MEASUREMENT CHANNEL LOGIC ESFAS functions with increasing signal setpoints should be modified to preclude inoperability of more than a single channel resulting from a FODCB. By modifying the bistable response to a FODCB, the PPS response becomes:
- 1. measurement channel A or D fails to the tripped state,
- 2. if the instrument loop de-energizes, channel B or C measurement channels requiring a l decreasing signal will trip, l 3. if the instmment loop remains energized, channel B or C measurement channels requiring a decreasing signal remain functional
- 4. and channel B or C functions with increasing signals fail inoperable.
Measurement channel logic allowed per TS is: Normal operation logic is 2 out of 4. With a channel in bypass, logic is 2 out of 3 (single failure results in 2 out of 2 logic). With a channel bypassed and a channel tripped (intentional), logic is 1 out of 2. (1 out of I logic with a single failure to trip). Attachment 9 and 10 contains the applicable TS sections. As seen in Table 3, PPS FODCB response for decreasing signal has not changed by modification of the bistable response. For PPS functions requiring an increasing signal one channel trips and one channel becomes inoperable. With reference to the TS allowed logic, a channel bypassed and a channel tripped, this response is acceptable. PS3 AND PS6 DE-ENERGIZATION (improve failure modes for increasing signals) RED TRAIN For red train DC bus failure resulting in loss of Vital AC to channels A and C:
- 1. All Ch A PPS (RPS and ESFAS) functions trip.
- 2. Channel B and D remain functional
- 3. Channel C ESFAS functions with increasing signal rendered non-functional. Channel C ESFAS functions with decreasing signals trip, except RAS and EFAS.
- 4. ESFAS with decreasing signals except RAS and EFAS actuate from the AC matrix provided neither channel A or C is bypassed.
l
- 5. For ESFAS functions with increasing signals, the AB, AD, and BD matrixes remain functional as required. If a Channel is bypassed at least one matrix remains functional.
GREEN TRAIN I For green train DC bus failure resulting in loss of Vital AC to channels B and D:
- 1. Ch D cach PPS (RPS and ESFAS) functions will trip.
- 2. Channel A and C remain functional
- 3. Channel B ESFAS functions with increasing signal rendered non-functional. Channel B j ESFAS functions with decreasing signals trip, except RAS and EFAS. ;
- 4. ESFAS with decreasing signals except RAS and EFAS actuate from the BD matrix provided !
neither channel B or D is bypassed. I I TITLE: REPORT NO: l PPS Response to Failure of a DC Bus 97-R-2015-01 I I l
f Engineering Report 97-R-2015411 P ge 29
- 5. For ESFAS functions with increasing signals, the AC, AD, and CD matrix remain functional as required. If a Channel is bypassed at least one matrix remains functional.
l I I 1 1 TITLE: REPORT NO: l PPS Response to Failure of a DC Bus 97-R-2015411
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E gineerirg Report 97-R 2015-01 Prge 36 ESFAS MATRIX LOGIC EVALUATION In terms of matrix and matrix power supplies, ESFAS actuation = AB or AD or AC or BC or BD or CD. l ESFAS actuation = ((PS21 and PS24) or (PS27 and PS25) or (PS28 and PS30) or (PS22 l and PS26) or (PS29 and PS31) or (PS23 and PS32)) in terms of de-energization of the AC sources for the matrix power supplies, ESFAS actuation = (2RSI and 2RS2) or (2RS3 and 2RS4). These equations indicate failure of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) does not result in an ESFAS actuation or failure caused by matrix power supply response to a FODCB. TRIP CHANNEL BYPASS LOGIC BYPASS POWER SUPPLIES AUCTIONEERING BYPASS 2RSI l l 2RS3 2RS2 l 2RS4 CHANNEL A PS49 AND PS51 CHANNEL B PS50 AND PS52 CHANNEL C PS53 AND PS55 CHANNEL D PS54 AND PS56 in terms of channel bypass and bypass power supply failure, ESFAS actuation = AB or AD or AC or BC or BD or CD. (Assumes a non-bypassed channel tripped) ESFAS actuation = ((PS49 and PS51 and PS50 and PS52) or (PS49 and PS51 and PS54 and PS56) or (PS49 and PS51 and PS53 and PS55) or (PS50 and PS52 and PS53 and PS55) or (PS50 and PS52 and PS54 and PS56) or (PS53 and PSS5 and PS54 and PS56)) In terms of de-energization of the AC sources for the bypass power supplies, ESFAS { actuation = (2RSl and 2RS2) or (2RS3 and 2RS4). (Assumes a non-bypassed channel tripped) These equations indicate de-energization of either combination, (2RS1 and 2RS3) or j (2RS2 and 2RS4) does not result in an ESFAS actuation or tripping of a channel I due to bypass power supply response to a FODCB. f TRIP PATil INITIATION EVALUATION Actuation of each trip path in terms of Matrix relays are: TPl = ABI or ACI or ADI or BC1 or BD1 or CD1 TP3 = AB3 or AC3 or AD3 or BC3 or BD3 or CD3 TP2 = AB2 or AC2 or AD2 or BC2 or BD2 or CD2 TP4 = AB4 or AC4 or AD4 or BC4 or BD4 or CD4
' TITLE: REPORT NO:
PPS Response to Failure of a DC Bus 97-R-2015-01
' Exgineerizg Report 97-R-2015-01 Pzge 37 In terms of de-energizing the matrix power supplies and AC sources the TP logic is:
. TPl = TP3 = PS21 or PS27 or PS28 or PS22 or PS29 or PS23 TP2 = TP4 = PS24 or PS25 or PS30 or PS26 or PS31 or PS32 TPI = TP3 = 2RSI or 2RS3 TP2 = TP4 = 2RS2 or 2RS4 These equations indicate failure of either combination, (2RS1 and 2RS3) or (2RS2 and 2RS4) results in a halfleg trip of both ARC.
MODIFIED EFAS ACTUATION EVALUATION Modification of the TP logic to each EFW pump discharge valves scheme will reduce the susceptibility to single trip path failures. For both MSIS and EFAS single trip path input to the valve schemes will be replaced with selective logic similar to that provided for the EFAS signal to the pumps. Single trip path failure will not impact the valve control. Reference Attachment 5 for the modified logic. Attachment 4 depicts the existing logic. EFAS Actuation = (TPl or TP3) and (TP2 or TP4)(locks out) EFAS Interposing Relay actuation = (TP1 or TP3) and (TP2 or TP4) (cycles) EFAS Actuation in terms of ARC power supplies de-energization = (PS5 and PS6) and (PS7 and PS8) Note De-energization of(PS5 and PS6) or (PS7 and PS8) will actuate a relay subgroup. By substituting the AC sources, EFAS Actuation for 2C39 = (2RSl and 2RS2) and (2RSl and 2RS2). By substituting the AC sources, EFAS Actuation for 2C40 = (2RS3 and 2RS4) and (2RS3 and 2RS4). These equations indicate failure of either FODCB combination,(2RSI and 2RS3) or (2RS2 and 2RS4) does not result in actuation or failure of EFAS or cycling of an EFAS valve. Interposing relays will cycle based on steam generator level demand. EFAS Actuation = (TPI or TP3) and (TP2 or TP4) By substituting the power supplies for the TPs, ESFAS actuation = (PS34 or PS40) and (PS37 or PS43) By substituting the AC sources for the power supplies ESFAS actuation = (2RSI or 2RS3) and (2RS2 or 2RS4) EFAS Interposing Relay Actuation (de-energize) = (TPI or TP3) and (TP2 or TP4) EFAS Interposing Relay Actuation (energize) = (TPl and TP3) or (TP2 and TP4) By substituting the power supplies for the TPs, ESFAS actuation = (PS34 or PS40) and (PS37 or PS43) By substituting the AC sources for the power supplies, ESFAS actuation = (2RSl or 2RS3) and (2RS2 or 2RS4) TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
Esgi ceriIg Report 97-R 2015-0t Pcge 38 1 l Ther,e equations indicate failure of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) does not results in actuation, failure of EFAS, or cycling of an EFAS valve. j EFAS Interposing relays cycle based on steam generator level demand to each trip path. The open signal logic is the same as EFAS actuation. The close signal to the eight valves is (TPl and TP3) or (TP2 and TP4). By this selective logic addition to the interposing relays, EFAS automatic level control signal dependency on a single power division has been eliminated. As with the existing valve design, if the valves are closed, loss of a power division results in need for manual (local) valve control due to loss of motive power. This l is the bases for the normally open and normally closed arrangement for the discharge ! valves. Reference Table 4 and attachment 2. OPTIONS TO IMPLEMENT MODIFIED LOGIC REWlRE EFAS AND MSIS TRIP LEGS. IIARDWARE IMPLEMENTATION for selective logic requires rewiring of the trip legs for MSIS, EFASI and EFAS2. Attachment 4 depicts the existing and Attachment 5 depicts the modified trip legs. Once actuated, the lockout relays separate the subgroup relays from the power supplies. Addition ofinterposing relays and the lockout relay contacts in the alarm circuits monitors their status during normal power operation. Trip paths for MSIS subgroup actuation will be rewired with MSIS interposing relays connected as subgroup relays. I l TITI.E: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
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Ecfneerirg Report 97 R-2015 01 P ge 40 RPS RESPONSE TO THE F0DCB SCENARIO BEFORE MODIFICATIONS Organization of the RPS response discussion starts with trip circuit breaker (TCB) signals and ends with the measurement channels. Reference Attachments 9 for TS definition of RPS trip logic - initiation logic, matrix logic, and measurement channel. RPS TRIP CIRCUIT BREAKERS RPS TRIP = (TPI or TP2) and (TP3 or TP4). RPS TRIP = ((TCB 1 and TCB 5) or (TCB 2 and TCB 6)) AND ((TCB 3 and TCB 7) or (TCB 4 and TCB 8)) RPS TRIP = (2RAI or 2RA2) and (2D35 or 2D36) RPS TRIP = (2D01 or 2D02) and (2RS3 or 2RS4) These equations indicate failure of either combination,(2D01 and 2RS3) or (2D02 and 2RS4) results in an RPS trip. RPS TRIP = (TPl or TP2) and (TP3 or TP4). By substituting the power supplies for the TPs, RPS TRIP = (PS34 or PS37) and (PS40 or PS43) By substituting the AC sources for the power supplies, RPS TRIP = (2RSI or 2RS2) and (2RS3 or 2RS4) These equations indicate failure of either combination, (2RSI and 2RS3) or (2RS2 and 2RS4) results in a RPS TRIP. TRIP PATII INITIATION Actuations of the trip paths in terms of Matrix relays is: TPl = ABl or ACl or ADl or BCl or BDl or CD1 TP2 = AB2 or AC2 or AD2 or BC2 or BD2 or CD2 TP3 = AB3 or AC3 or AD3 or BC3 or BD3 or CD3 ) TP4 = AB4 or AC4 or AD4 or BC4 or BD4 or CD4 l l In terms of de-energizing the matrix power supplies and AC sources the TP logic is: TPl = PS9 or PS10 or PSI 1 = 2RSI TP2 = PS13 or PS14 or PS12 = 2RS2 TP3 = PS17 or PS15 or PS16 = 2RS3 TP4 = PS18 or PSl9 or PS20 = 2RS4 TITLE: REPORT NO: l PPS Response to Failure of a DC Bus 97-R-2015-01 l l L l
_. y , Eatgineeri:3 Report 97-R-2015-01 P:ge 41 ( l RPS TRIP = (TP1 or TP2) and (TP3 or TP4). RPS TRIP = (2RSl or 2RS2) and (2RS3 or 2RS4) 1 These equations indicate failure of either combination, (2RSI and 2RS3) or (2RS2 and 2RS4) results in a RPS trip. TRIP CHANNEL BYPASS LOGIC BYPASS POWER SUPPLIES AUCTIONEERING ! BYPASS 2RSI l l 2RS3 l l 2RS2 l 2RS4 CHANNEL A PS49 and PS51 CHANNEL B PS50 and PS52 CHANNEL C PS53 and PS55 CHANNEL D PS54 and PS56 In terms of channel bypass and bypass power supply failure, RPS TRIP = AB or AD or AC or BC or BD or CD. RPS TRIP = ((PS50 and PS52 and PS49 and PS51) or (PS50 and PS52 and PS54 and PS56) or (PS50 and .PS52 and PS53 and PSSS) or (PS49 and PS5I and l PSS3 and PS55) or (PS49 and PS51 and PS54 and PS56) or (PS53 and PS55 and PS54 and PS56)) In terms of de-energization of the AC sources for the bypass power supplies,
- RPS TRIP = (2RSI and 2RS2) or (2RS3 and 2RS4).
These equations indicate de-energization of either combination,(2RSI and 2RS3) or I (2RS2 and 2RS4) does not result in tripping of a bypassed channel.
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TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
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Engineering Report 07-R-2015-01 Pcge 44 RPS TRIP CIRCUIT BREAKERS AFTER MODIFICATIONS RPS TRIP = (TPl or TP2) and (TP3 or TP4). RPS TRIP = ((TCB 1 and TCB 5) or (TCB 2 and TCB 6)) AND ((TCB 3 and TCB 7) or (TCB 4 and TCB 8)) RPS TRIP = (2RAI or 2RA2) AND (2D35 or 2D36) RPS TRIP = (2D01 or 2D02) and (2RS3 or 2RS4) These equations indicate failure of either combination,(2D01 and 2RS3) or (2D02 and 2RS4) results in an RPS trip. Modifications had no impact. RPS TRIP = (TPl or TP2) and (TP3 or TP4). By substituting the power supplies for the TPs, RPS TRIP = (PS34 or PS37) and (PS40 or PS43) By substituting the AC sources for the power supplies, RPS TRIP = (2RSI or 2RS2) and (2RS3 or 2RS4) These equations indicate failure of either combination,(2RS1 and 2RS3) or (2RS2 and 2RS4) results in a RPS TRIP. Modifications had no impact. TRIP PATII INITIATION AFTER MODIFICATIONS l 1 Trip of the trip paths in terms of Matrix relays is: TPI = ABI or ACI or ADI or BC1 or BD1 or CD1 TP2 = AB2 or AC2 or AD2 or BC2 or BD2 or CD2 TP3 = AB3 or AC3 or AD3 or BC3 or BD3 or CD3 TP4 = AB4 or AC4 or AD4 or BC4 or BD4 or CD4 In terms of de-energizmg the matrix power supplies and AC sources the TP logic is: TPl = PS9 or PS10 or PSI 1 = 2RSl TP2 = PS13 or PSl4 or PS12 = 2RS2 TP3 = PS17 or PS15 or PS16 = 2RS3 TP4 = PS18 or PS19 or PS20 = 2RS4 RPS TRIP = (TPl or TP2) and (TP3 or TP4). RPS TRIP = (2RSI or 2RS2) and (2RS3 or 2RS4) These equations indicate failure of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) results in a RPS trip. Modifications had no impact. l TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 I l
u.r , w-- . Engineering Report 97-R 2015-01 Page 45 TRIP CHANNEL BYPASS LOGIC BYPASS POWER SUPPLIES AUCTIONEERING BYPASS 2RSI l l 2RS3 2RS2 l 2RS4 CHANNEL A PS49 AND PS51 CHANNEL B PS50 AND PS52 CHANNEL C PS53 AND PS55 CHANNEL D PS54 AND PS56 in terms of channel bypass and bypass power supply failure, RPS TRIP = AB or AD or AC or BC or BD or CD. (Assumes non-bypassed channel tripped) l RPS Trip = ((PS49 and PSSI and PS50 and PS52) or (PS49 and PS51 and PS54 and PS56) or (PS49 and PS51 and PS53 and PS55) or (PS50 and PS52 and PS53 and PS55) or (PS50 and PS52 and PS54 and PS56) or (PS53 and PS55 and PS54 and PS56)). In terms of de-energization of the AC sources for the matrix power supplies, RPS TRIP = (2RSI and 2RS2) or (2RS3 and 2RS4). (Assumes non-bypassed channel tripped.) These equations indicates de energization of either combination,(2RSI and 2RS3) or (2RS2 and 2RS4) does not result in tripping of a bypassed channel. Modifications had no impact. TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
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Ergineerirg Report 97-R-2015-01 Page 48 DECREASE IN SUSCEPTIBILITY TO SINGLE POWER DIVISION LOOP As indicated in the FMEA for FODCB, loss of control power to 2Al or 2A2 and the assumed turbine / generator trip results in loss of power to one power division. The combination of failure of a DC bus and de-energization of a single power division leads to de-energization of two vital AC inverters. The 480 VAC inputs and the DC input are de-energized to each inverter in the faulted power division. (2Yll and 2Y13) or (2Y22 and 2Y24) are de-energized. if any one of the three power inputs to the inverter is not de-energized, the consequences of the FODCB is significantly reduced. One power source to the inverters could be retained if the DC control voltage to the offsite power source was not de-energized. Control power to the existing offsite power switchgear,2Al and 2A2, requires control power from separate sources. Maintaining the separation requirements yet reducing the susceptibility to de-energization could be accomplished by addition of backup DC sources. Criterion imposed on the design to provide the automatic backup control power eliminates standard transfer switches due to response time issues. Basically the backup would have to respond with sufficient speed to ensure 2Al or 2A2 fast transfer. A slow bus transfer will not maintain power to the Vital AC buses associated with the faulted division. Since the loads on the safety bus would not be load shed (no load sequencing), the slow transfer could challenge the undervoltage setpoints or damage the service water pump motors. With the plant at power operation, a FODCB results in loss of control DC to the loads on the H buses, two RCPs and a CWP. Since the control power to the H bus feeders is powered from the black battery, the assumed plant trip results in initiation of H bus transfer to SU#3. For economic reasons and for enhancement of 2H1 and 2H2 response to the FODCB scenario, the output of the two transfer switches for 2Al and 2A2 could also be used for 2H1 and 2H2. The existing non-safety related DC control power to the H bus feeder breakers would be re-designed as the backup power source. H Bus Response With Backup DC With backup DC (black battery) to the offsite switchgear, a FODCB results in loss of primary control DC (red or green battery) to the load switchgear on the H buses, two RCP motors and a CWP motor and the H bus feeder breakers. The assumed plant trip results in initiation of H bus transfer to SU#3. If the fast transfer works, no significant issues result. If the fast transfer fails, both the feeder and the load breaker remain functional with the load breakers tripped by bus undervoltage. Review of RG 1.63, S AR section 8.3.1.2 indicates the 2H buses feeder breakers serve as backup l to the RCP load breakers that serve as primary contain penetration protection. The SAR indicates the backup breaker design is not in full compliance with the RG 1.63 requirement for compliance with IEEE 279. In general, this is assumed to mean two independent circuit breakers for containment building penetration protection. Although the breakers are not independent, the primary breaker control power source is diverse from the backup breaker control power. The TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 l L__-__________ J
Eagineerirg Report 97-R 2015-01 Pcge 49 latest revision of RG 1.63 imposes IEEE 741 which is satisfied by primary and backup circuit breakers that are not required to be treated as Class 1E. In summary, the design bases requires a primary and a backup circuit breaker. Although not specifically identified as a requirement, diverse control power sources should be retained. In summary, if a sufficiently fast backup DC power source transfer or auctioneered circuit design is installed
- 1. The offsite power sources should remain functional with a successful fast transfer.
- 2. 2H bus motor load protection would remain functional.
- 3. 2Al breaker controls would remain functional.
- 4. With failure of 2Al/2A2 fast transfer to SU#3,2A3/2A4 loads would be re-energized with out benefit ofload sequencing. Impact on Millstone protection for 2A3 could occur and damage to the service water motors on the faulted power division could occur.
- 5. With failure of 2Al/2A2 fast transfer to SU#3, momentary loss of two channels of vital AC would occur.
The addition of a backup DC control power f r offsite power switchgear is considered an enhancement that has limited economic and safety improvement pay back. Plant response after installation of the proposed PPS modifications ensures safe plant response to the low probability of failure of a DC bus. This enhancement will be added to the system engineering notebook for future consideration. CONCLUSIONS AND RECOMMENDATIONS A) As modified the PPS has redundancy and independence suflicient to assure that (1) no single faihire results in loss of the protectionfunction, and (2) remondfrom service of any component or channel does not result in loss of the required minimum redundancy required by the 7N. B) As modified, the PPS is designed tofailinto a safe state or into a state demonstrated to be acceptable on some other defined basis. C) As modified, PPS meets the single failure criterion ofIEEE 279-1971 to the extent that: Any singlefailure within the system does notprevent properprotective action at the system level and no singlefailure willdefeat more than one of thefourprotective cha,mels associated with any one tripfunction. 7he system permits any one channel to be maintained and, when required, tested or calibrated duringpower operation without initiating aprotective action at the system level. During such operation, the active parts of the system shall, of themselves, continue to meet the singlefailure criterion. As summarized in Table 2, PPS (ESFAS and RPS) functions with decreasing signal setpoints actuate, and those functions with increasing signal setpoints remain functional with one channel TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 N
I Engineering Report 97-R-2015-01 Pzge 50 tripped. Only one channel is rendered in-operable by FODCB. The only other PPS FMEA change by de-energization of the auctioneered bistable power supplies is an increase in the number of causes for tripping channel A or D. The added cause is loss of a single bistable power supply output. The existing PPS FMEA, attachment 12, indicates unacceptable PPS response to the FODCB scenario. The revised PPS FMEA, attachment 13 indicates the acceptability of the PPS response. As indicated in the PPS FMEA, deenergization of the two bistable power supplies corrects the response to the FODCB scenario. Although the modification corrects the response, the single channel failures causes were increased to include failure of a single bistable power supply. Note single channel failures are acceptable. In addition, the FMEA indicates excellent EFAS response to the modified actuation logic. Addition of selective logic to the actuation (EFAS and MSIS) of the EFW valves decreases susceptibility to single trip path failures. The function of these valves has not been changed. Note, the selective logic addition precludes cycling of these valves during PPS matrix testing. Although addition of the backup DC to the offsite switchgear terminates the FODCB scenario by maintaining offsite power to the inverters, it is not recommended for design development at this time. TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97 R-2015-01 e~
p Ergineerlig Report 97-R-2015-01 P:ge 51 REFERENCES ANO-2 PPS Technical Manual C490.0850, Vol. II, Revision F,1/28/91 i ANO 2 PPS Technical Manual C490.0850, Vol. I, Revision F,1/28/91 l l ABB-CE Qualification Summary Report for the Replacement Plant Protection System Power Supply Door Assembly for the Arkansas Power and Light Company ANO-2, 82689-ICE-37205, Rev. 00,11/23/92 l ABB/C-E Specifications: General Engineering Specification for a Plant Protection System, 00000-ICE-3001, Rev. 1,3/30/73 ANO-2 Pmject Engineering Specification for a Plant Protection System, 6370-ICE-3001, Rev. 01,4/4/73
~ General Engineering Specification for ESFAS Auxiliary Relay Cabinet,00000-ICE-3002, Rev. 4, 5/21/73 ANO-2 Project Engineering Specification for a ESFAS Auxiliary Relay Cabinet, 6370-ICE-3002, Rev. 3,12/2/75 AP&L ANO-2 Drawings:
low Voltage Safety Systems Power Supplies Single Line Diagram E2006, Rev. 23,10/28/91 120 VAC RPS/ESF Power Distribution Panels E2022, Rev. 20,12/5/91 ANO-2 SAR Chapter 6, 7, 8, and 15 ANO-2 ESFAS A. R. C. Technical Manual, C490.0730 ABB-CE, Final Analysis Report of the PPS, EFS/ ARC, and LRWTL Process Instrumentation to Determine Effects on the Recirculation Actuation Signal Due to Vital Bus Faults at ANO-2,6370-ICE-8608-00,2/13/78. Design Change Package 89-2053, " Diverse Emergency Feedwater Actuation System". 2SER159, Engineering Report 93-R-2003 Rev 2, 6370-ICE-3316 Rev 0 E-2090 Revl3, Unit Aux, Scheme Drawing E-2091 Rev22, SU#3 Scheme Drawing TITLE: REPORT NO: PPS Response to Failure of a DC Bus . 97-R-2015-01 - - _ _ - _ _ _ _ _ - _ _ _ _ - _ _ _ _ - _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ .)
Eagineeri:g Report 97-R-2015 411 Ptge 52 E-2092 Rev 23, SU#2 Scheme Drawing E-2093, Bus IAckout and UV Relays Diagram E-2299 and E-2300 Series, Schematic EFW Discharge Valves M2001-M3-7 sh 1 Rev 7 and 1 A Revi, Schematic Auxiliary Relay Cabinet M2204 sh 4 Rev 55, P&ID Emergency Feedwater CR 97-2-0434, , TS Allowance to Operate With a Channel Tripped (EFAS/SG level). CR-97-2-168, TS Allowance to Opente With a Channel Tripped (RAS /RWT lev:!). CALC 97-E-0028-01, Safety Related Inverter Ioad List 10 CFR 50 Appendix A IEEE 279 - 1971 TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01 r. J
Eigineeri g Report 97-R-2015-01 P ge 53 ATTACHMENTS 1 l l 1 TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-R-2015-01
Eigineeri g Report 97-R 2015-01 P ge 54
- ATTACHMENT 1 EXISTING EFW POWER SOURCES, TRIP PATilS, & ACTUATION RELAYS 2CV-1038-2 2CV-1025-1 (Green AC Powered) (Red AC Powered)
(Green DC Controlled) (Red DC Controlled) EFAS TP 4, K7248 EFAS TP-1, K624A 2P7B MSIS TP-4, K723B MSIS TP-1, K623A (Red AC Powered) (Red DC Controlled) To 2E24 A SG 4 >4 To 2E24B SG : ?4 2CV 1036 2 2CV-1075-1 (Green AC Powered) (Red AC Powered) (Green DC Controlled) (Red DC Controlled) EFAS TP-4, K725B EFAS TP 1, K625A MSIS TP 4, K723B MSIS TP-1, K623A 2CV 10371 2CV-1026-2
]
(Red DC Powered) (Green DC Powered) l (Red DC Controlled) (Green DC Controlled) l EFAS TP-2, K724A EFAS TP-3, K624B 2P7A 1 MSIS TP-2, K723A MSIS TP-3, K623B (Stearn Powered) (Green DC Controlled) To 2E24A SG < >< ' To 2E24B SG : 74 2CV-1076-2 2CV-10391 l (Red DC Powered) (Green DC) l (Red DC Controlled) (Green DC Controlled) ; EFAS TP 2, K725A EFAS TP-3, K625B i MSIS TP-2, K723A MSIS TP 3, K6238 i TITL.E: REPORT NO: I PPS Response to Failure of a DC Bus 97-R-2015-01 L_
Ecgineerirg Report 97-R-2015-01 Prge 55 ATTACHMENT 2 MODIFIED EISV POWER SOURCES, TRIP PATilS, & ACTUATION RELAYS 2CV 1038-2 2CV-1025-1 (Green AC Powered) (Red AC Powered) (Green DC Controlled) (Red DC Controlled) EFAS,K724B EFAS, K624A 2P78 MSis, K723B MSis, K623A (Red AC Powered) (Red DC Controlled) To 2E24A SG : >4 To 2E24B SG : ?4 2CV-1036-2 2CV 1075-1 (Green AC Powered) (Red AC Powered) (Green DC Controlled) (Red DC Controlled) EFAS,K725B EFAS, K625A MSIS, K7238 MSIS, K623 A EFAS OPEN LOGIC = (TP1 or TP3) and (TP2 or TP4) EFAS CLOSE logic = (TP1 and TP3) or (TP2 and TP4) MSIS LOGIC = (TP1 or TP3) and (TP2 or TP4) 2CV-1037 1 2CV 1026-2 (Red DC Powered) (Green DC Powered) (Red DC Controlled) (Green DC Controlled) EFAS,K724A EFAS,K624B 2P7A MSIS, K723A MSIS, K6238 (Steern Powered) (Green DC Controlled) To 2E24 A SG : >4 L I I I I To 2E24B SG : '
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EFAS,K725A EFAS, K6258 MSIS, K723A MSIS, K6238 TITLE: REPORT NO: ! PPS Response to Failure of a DC Bus 97-R-2015-01 i )
I Esgineeri:g Report 97-R-2015-01 Ptge 56 ATTACHMENT 3 Deleted TITLE: REPORT NO: PPS Response to Failure of a DC Bus 97-N-2015-01 - - - - - - _ - - _ - _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ i
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E2gineeri;g Report 97-R-2015-01 P:ge C2 ATTACHMENT 8 TS BASES INSTRUMENTATION 3/4.3 INSTRUMENTATION BASES 3/4 3_1 and 3/4 3.2 PROTECTIVE AND ENGINEERED SAFETY FEATURES,(ESF) INSTRUMENTATION The OPERABILITY of the protective and ESF instrumentation s3 stems and bypasses ensure that 1) the associated ESF action and/or reactor trip will be initiated w hen the parameter monitored by each channel or combination thereof reaches its setpoint 2) the specified coincidence logic is maintained,3) sufficient redundancy is maintained to permit a channel to be out of senice for testing or maintenance, and 4) su0icient system functional capability is available for protective and ESF purposes from diverse parameters The OPERABILITY of these systems is required to provide the overall reliability, redundancy and diversity assumed available in the facility design for the protection and mitigation of accident and transient conditions. The integrated operation of each of these systems is consistent with the assumptions used in the accident analy ses. The surveillance requirements specified for these systems ensure that the overall system functional capability is maintained comparable to the original design standards. The periodic surveillance tests performed at the minimum frequencies are sufficient to demonstrate this capability. The triannual channel functional testing frequency is to be performed on a STAGGERED TEST BASIS. The measurement of response time at the specified frequencies provides assurance that the protective and ESF action function associated with each channel is completed within the time limit assumed in the accident analyses. No credit w as taken in the anal)ses for ' hose channels with response times indicated as not applicable. Response time may be demonstrated by any series of sequential, overlapping or total channel test measurements provided that such tests demonstrate the total channel response time as defined. Sensor response time verification may be demonstrated by cither 1) in place, onsite or offsite test measurements or 2) utilizing replacement sensors with certified response times. RTD response time is defined as the time interval required for the RTD output to achieve 63.2% of its total change w hen subjected to a step change in RTD temperature. The RTD response time for the Core Protection Calculator System (CPCS)is c': pressed as an effective time constant. For hot leg temperatures, the effective time constant for a given CPC channel is defined as the mean time constant for averaged pairs of hot leg RTD inputs to the channel. This is done because the CPCS utilizes the mean hot leg temperature in its calculations. The maximum hot leg effective time constant allowable for use in the CPCS is 13.0 sceonds. For cold leg temperatures, the effective time constant to be used in Figure 3.3-1 is the maximum time constant of the two cold leg RTD inputs for a given channel. The CPCS utilizes the more conservative cold leg temperature in the various DNBR and LPD calculations. The maximum cold leg cfrective time constant allowabic for use in the CPCS is 13.0 seconds. ARKANSAS - UNIT 2 B 3/4 3-la Amendment No.159 1 I l L______ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ >
E2gineeri:g Mcport 97-R-2015-01 Py,e 63 3/4.3 INSTRUMENTATION BASES Plant Protective System (PPS) logic is designed for operation as a 2-out-of-3 logic, although nonnally it is operated in a 2-out-of-4 mode. The RPS Logic consists of everything downstream of the bistable relays and upstream of the Reactor Trip Circuit Breakers. The RPS Logic is divided into two parts, Matrix Logic, and initiation Logic. Failures of individual bistables and their relays are considered measurement channel failures. The ESFAS Logic consists of everything downstream of the bistable relays and upstream of the subgroap relays. The ESFAS Logic is divided into three parts, Matrix Logic, Initiation Logic, and Actuation Logic Failures ofindividual bistables and their relays are considered measurement channel failures. Matrix Logic refers to the matrix power supplies, trip channel bypass contacts, and interconnecting matrix wiring between bistable relay cards, up to, but not including the matrix relays. Matrix contacts on the bistable relay cards are excluded from the Matrix Logic definition since they are addressed as part of the measurement channel. Initiation Logic consists of the trip path power source, matrix relays and their associated contacts, all interconnecting wiring, and the initiation relays (including contacts) ESFAS Actuation Logic consists of all circuitry housed within the Auxiliary Rehy Cabinets (ARCS) used to house the ESF Function; excluding the subgroup relays, and interconnecting wiring to the initiation relay contacts motmted in the PPS cabinet. For the purposes of this LCO, de-energization of up to three matrix power supplies due to a single failure, such as loss of a vital
. instrument bus, is to be treated as a single matrix channel failure, providing the afTected matrix relays de-energize as designed to produce a half-trip. Although cach of the six matrices within an ESFAS Function (e g., SIAS, MSIS, CS AS, etc.) uses separate power supplies, the matrices for the difTerent ESFAS Functions share power supplies. Tims, failure of a matrix power supply may force entry into the Condition specified for each of the associated ESFAS Functional Units.
ARKANSAS - UNIT 2 B 3/4 3 la Amendment No.159 L _ - i
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r-- Engineering Report 97.R-2015-01 Pcge 66 I TABLE 3.3-1 (Continued) TABLE NOTATION
*With the protective sy stem trip breakers in the closed position and the CEA drive system capable of CE/. withdrawal.
(a) Trip may be manually bypassed above 10"% of RATED THERMAL POWER: by d pass shall be automatically removed when THERMAL POWER is s 10 % of RNfED TIIERMAL POWER. (b) Trip may be manually bypassed below 400 psia; bypass shall be automatically removed whenever pressurizer pressure is 2 500 psia. d (c) Trip may be manually bypassed below 10 % of RATED THERMAL POWER; bypass shall be automatically removed when THERMAL POWER is 210"% of RATED THERMAL POWER. During testing pursuant to Special Test 4 Exception 3.10.3, trip may be manually bypassed below 1% of RATED j TilERMAL POWER; bypass shall be automatically removed when THERMAL POWER is 21% of RATED THERMAL POWER. (d) Trip may be bypassed during testing pursuant to Special Test Exception 3.10.3. (c) See Special Test Exception 3.10.2. (O Each channel shall be comprised of two trip breakers; actual trip logic shall be one-out-of-two taken twice. ACTION STATEMENTS ACTION 1 - With the number of channels OPERABLE one less than required by the Minimum Channels OPERABLE requirement. restore the inoperable channel to OPERABLE status within 48 hours or be in HOT STANDBY within the next 6 l hours and/or open the protective system trip breakers. I l 1 i ARKANSAS - UNIT 2 3/43-2 Amendment No b
Engineering Report 97-R-2015-01 Page 67 TABLE 3.31 (Continued) ACTION STATEMENTS ACTION 2 - With the number of channels OPERABLE one less than the Total Number of Channels, STARTUP and/or POWER OPERATION may continue provided the inoperable channel is placed in the bypassed or tripped condition within I hour. If the inoperable channel is bypassed for greater than 48 hours, the desirability of maintaining this channel in the bypassed condition shall be resiewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations. The channel shall be returned to OPERABLE status prior to startup following the next COLD SHUTDOWN. With a channel process measurement circuit that affects multiple functional units inoperable or in test, bypass or trip all associated functional units as listed below. Process Measurement Ciremt Functional Unit Bvnassed
- 1. Linear Power Linear Power Level -liigh (Subchannel or Linear) Local Power Density -liigh DNBR - Low Log Power Level -liigh*
- 2. Pressurizer Pressure - NR Pressurizer Pressure -liigh Local Power Density -liigh DNBR - Low
- 3. Containment Pressure - NR Containment Pressure -liigh (RPS)
Containment Pressure -liigh (ESFAS) Containment Pressure -liigh-liigh (ESFAS)
- 4. Steam Generator i Pressure Steam Generator i Pressure - Low Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 5. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low j Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 6. Steam Gencrator i Level Steam Generator i Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EFAS 1)
- 7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EFAS 2)
- 8. Core Protection Calculator Local Power Density -liigh DNBR - Low l
- Only for f ailure conunon to both linear power and log power.
1 ! ARKANSAS - UNIT 2 3/4 3-2 Amendment No I L_ J
l ErgineeriIg Report 97-R-2015-01 P:ge 68 TABLE 3.3-1 (Continued) ACTION STATEMENTS ACTION 3 - With the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, STARTUP and/or POWER OPERATION may continue provided the following conditions are satisfied:
- a. Verify that one of the inoperable channels has been bypassed and place the other inoperable channelin the tripped condition within I hour, and
- b. All functional units afTected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as listed below:
Process Measurement Circuit Functional Unit Bypassed / Tripped
- 1. Lincar Power Linear Power Level - High (Subchannel or Lincar) Local Power Density - High DNBR - Low Log Power Level - High"
- 2. Pressurizer Pressure - NR Pressurizer Pressure - High Local Power Density -High DNBR - Low
- 3. Containment Pressure - NR Containment Pressure - High (RPS)
Containment Pressure - High (ESFAS) Containment Pressure - High-High (ESFAS)
- 4. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EFAS I)
Steam Generator 2 AP (EFAS 2)
- 5. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 6. Steam Generator I Level Steam Generator 1 Level- Low Steam Generator 1 Level - High Steam Generator 1 AP (EFAS 1)
- 7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EFAS 2) 1
- 8. Core Protection Calculator Local Power Density - High DNBR - Low STARTUP and/or POWER OPERATION may continue until the performance of the next required CHANNEL FUNCTIONAL TEST. Subsequent STARTUP and/or POWER OPERATION may continue if one channel is restored to i " Only for failure or activities common to both linear power and log power.
1 ARKANSAS - UNIT 2 3/43-2 Amendment No l
. J
I Engirecrirg Report 97-R-2015-01 P:ge 69 I OPERABLE status and the provisions of ACTION 2 are satisfied ACTION STATEMENTS ACTION 4 - With the number of channels OPERABLE one less than required by the Minimum Channels OPERABLE requirement, verify compliance with the SHUTDOWN MARGIN requirements of Specification 3.1.1.1 or 3.1.1.2, as applicable, within I hour and at least once per 12 hours thereafter. ACTION 5 - With the number of channels OPERABLE one less than required by the Minimum Channels OPERABLE requirement, place the reactor trip breakers of the inoperable channel in the tripped condition within I hour or be in HOT STANDBY within 6 hours; however, one channel may be bypassed for up to I hour for surveillance testing per Specification 4.3.1.1.1. ACTION 6 - a. With one CEAC inoperable, operation may continue for up to 7 day s provided that at least once per 4 hours, each CEA is verified to be within 7 inches (indicated position) or all other CEAs in its group. After 7 days, operation may continue provided that ACTION 6.b is met.
- b. With both CEACs inoperable, operation may continue provided that:
- 1. Within I hour the margin required by Specification 3.2.4.b (COLSS in senice) or Specification 3.2.4.d (COLSS out of senice) is satisfied.
- 2. Within 4 hours:
a) All CEA groups are withdrawn to and subsequently maintained at the " Full Out" position, except during surveillance testing pursuant to the requirements of Specification 4.1.3.1.2 or for control uhen CEA group 6 may be insened no funher than 127.5 inches withdrawn. b) The "RSPT/CEAC Inoperable" addressable constant in the CPCs is set to both CEACs inoperable. c) The Control Element Drive Mechanism Control System (CEDMCS)is placed in and subsequently maintained in the "OFF" mode except during CEA motion permitted by a) above, when the CEDMCS may be operated in either the " Manual Group" or " Manual Individual" mode. ARKANSAS - UNIT 2 3/4 3-2 Amendment No i l
E gineerirg Report 97-R-2015-01 P:ge 70 t TABLE 3.3-1 (Continued) ACTION STATEMENTS l
- 3. At least once per 4 hours, all CEAs are verified fully withdrawn, except as permitted by 2. a) above, then verify at least once per 4 hours that the inserted CEAs are aligned within 7 inches (iadicated position) of all other CEAs in their group.
ACTION 7 - With three or more auto restarts of one non-bypassed calculator during a 12-hour interval, demonstrate calculator OPERABILITY by performing a CHANNEL FUNCTIONAL TEST within the next 24 hours. ACTION 8 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE requirement restore the inoperable channel to OPERABLE status within 48 hours or open the alTected reactor trip breakers within the next hour. The trip breakers associated with the inoperable channel may be closed for up to I hour for surveillance testing per Specification 4.3.1.1. l l J l i i I ARKANSAS - UNIT 2 3/43-2 Amendment No
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I E:gineerirg Report 97-R-2015-01 Pzge 75 of 192 ( TABLE 3.3-3 (Continued) TABLE NOTATION (a) Trip function may be bypassed in this MODE w hen pressurizer pressure is below 400 psia; bypass shall be automatically removed when pressurizer pressure is it 500 psia. (b) An SlAS signal is first necessary to enable CSAS logic. l l (c) Remote manual not provided for RAS. These are local manuals at each ESF auxiliary relay cabinet. ACTION STATEMENTS ACTION 9 - With the number of OPERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours or be in at least HOT STANDBY within the next 6 hours and in COLD SHUTDOWN within the following 30 hours. ACTION 10 - With the number of channels OPERABLE one less than the Total Number of Channels, STARTUP and/or POWER OPERATION may continue provided the inoperable channel is placed in the bypassed or j tripped condition within I hour. If the inoperable channelis bypassed for greater than 48 hours, the desirability of maintaining this channel in the bypassed condition shall be reviewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations. The channel shall be returned to OPERABLE status prior to startup following the next COLD SHUTDOWN. With a channel process measurement circuit that alTects multiple functional units inoperable or in test, bypass or trip all associated functional units as listed below. Process Measurement Circuit Functional Unit Bypassed
- 1. Containment Pressure - NR Containment Pressure - High (RPS)
Containment Pressure - High (ESFAS) Containment Pressure - High-High (ESFAS)
- 2. Steam Generator i Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 4. Steam Generator 1 Level Steam Generator i Level - Low Steam Generator 1 Level- High Steam Generator 1 AP (EFAS 1)
- 5. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level- High Steam Generator 2 AP (EFAS 2) i J
Ergineerirg Report 97-R-2015-01 Pcge 75 of 192 TABLE 3.3-3 (Continu_ed) ACTION 11 - With the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, STARTUP and/or POWER OPERATION may continue provided the following conditions are satisfied:
- a. Verify that one of the inoperable channels has been bypassed and place the other inoperable channel in the tripped condition within I hour, and
- b. All functional units afTected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as listed below:
Process Measurement Circuit Functional Unit Bvpassedrfripped
- 1. Contaimnent Pressure - NR Containment Pressure -liigh (RPS)
Containment Pressure - liigh (ESFAS) Containment Pressure -liigh-liigh (ESFAS) ,
- 2. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EFAS 1)
Steam Generator 2 AP (EFAS 2)
- 3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EFAS !)
Steam Generator 2 AP (EFAS 2)
- 4. Steam Generator 1 Level Steam Generator i Level - Low Steam Generator i Level -liigh Steam Generator 1 AP (EFAS 1)
- 5. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EFAS 2)
STARTUP and/or POWER OPERATION may continue until the performance of the next required CilANNEL FUNCTIONAL TEST. Subsequent STARTUP and/or POWER OPERATION may continue if one channel is restored to OPERABLE status and the provisions of ACTION 10 are satisfied. ACTION 12 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE, restore the inoperable charmel to OPERABLE status within 48 hours or be in at least IIOT STANDBY within the next 6 hours and in COLD SliUTDOWN within the following 30 hours. ACTION 13 - With the number of OPERABLE channels one less than the Total Nu'nber of Channels, restore the inoperable channel to OPERABLE status within 48 hours or be in at least liOT STANDBY within the next 6 hours and in COLD SilUTDOWN within the following 30 hours; however, one channel may be bypassed for up to I hour for surveil!ance testing provided the other channel is OPERABLE. l l l l
Engine (rirg Report 97-R-2015-01 Prge 77 of 192 ATTACHMENT 11 Deleted 4
E:gineeri g Report 97-R-201541 P:ge 78 of 192 ATTACHMENT 12 PPS FAILURE MODES AND EFFECTS ANALYSIS l l
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