ML17139B890

App E to Rev 1 to Control Sys Power Supply & Sensor Malfunction Study, Failure Modes & Effects Analysis.

ML17139B890
Person / Time
Site:	Susquehanna
Issue date:	03/31/1982
From:	EDS NUCLEAR, INC.
To:
Shared Package
ML17139B884	List: ML17139B883 ML17139B885 ML17139B887 ML17139B888 ML17139B890 ML17139B891 ML18040A709 ML18040B027
References
02-0160-1102-AP, 02-0160-1102-R1-APPE, 2-160-1102-AP, 2-160-1102-R1-APPE, NUDOCS 8310180501
Download: ML17139B890 (60)

Text

Report No. 02-0160-1102 Revision 0 APPENDIX E FAILURE MODES AND EFFECTS ANALYSIS 8310i8050i 83i014 PDR ADQCK 050D0387 P PDR f )

37

0 Report No. 02.-0160-1102 Revision 0 GUIDE FOR USING THE FAILU'RE MODES AND EFFECTS ANALYSIS (FMEA)

1. The FMEA's contained herein are segregated by common power supply or sensor. Each system that 'is affected by this commonality is then analyzed individually to determine the appropriate failure information.

The two "Effects" columns on the FMEA's provide a summary of the results of the combined failure of all the components noted in the "Components" column.

Pacilitya Susquehanna Steam Electric Station PAILURE HODES AND EPPECTS ANALYSIS Sheet 1 of 3 Docket'0-387, 50-388 Job No. 0160-004-671 Prepared bye r.wl~-i 0160 004-001 rl Rev 0 ICommou Power I

IControl System Affected'0615 Supply or Sensor: 125VDC Reactor Peedwater Control S stem CSIDc CDc 0160-004-011 Datea Checked bye Approved bye Datea Date:

Symptoms and Local Summaryx Summarya Component Name Pailure Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating Provision Control System Plant Performance

1. Reactor feed pump turbine Ac I De-ener- Trip circuit is de-ener- Trip circuits for feed Loss of ability to trip There is no affect on

a. Trip circuit - Level 8 I gized gized pump turbines 8 and C are turbine A on I.evel 8 trip plant performance unless trip contacts powered by other DC poser signal Level 8 trip condition Level 8 trip signal supplies exists cannot be processed

Pacility: Susquehanna Steam Electric Station PAILUBE IIODES AND EPPECTS ANALXSIS Shoot 3 of 3 Docket'0-387, 50-388 Job No. 0160-004-671 Prepared by:

ICommon Powor Supply or Sonsor: 10615 125 VDC CSIDs 0160 004-001 Dates Bov. o Dates I

IControl System Affoctod: P ~R1 to d '1/d Co trol CDa 0160-004-011 Checked bya Approved bye Da to'c Symptoms and Local Summary c Summarys Component Name Pailure Effects Including System Inhoront Effect Upon Effoct Upon and Numbor Node Dopondont Failures Compensating Provision Control System Plant Performance

1. Trip and alarm switchosc Logic reduced to a 2/2 The loss of power does

a. PSL<<11981A1, Bl/Thrust Pail High PSLX-11981 Al, Bl will Logic arrangomont (2/3) logic arrangomant-both not causa an EHC trip.

boaring waar detector and not energizes in EHC trip system pre- remaining relays must thus there is no impact low bearing oil pressure - Contacts remain un- vents a single power energize to complete the on overall plant por-changed supply from interrupting trip configuration formanco the EHC trip logic Loss of primary unit

b. PSL-10180A/Low hyd rau 1 ic IPail High ~ PSLX-10180A will not If turbines are shut protection on generator fluid pressure energizes down, back-up unit pro-

- Contacts remain un- tection available for ~ Any genorator malfunc-changed anti-monitoring tions cannot induce an EIIC trip by way of pri-

c. PSL-11932A/Shaf t pump IPail High PSIX-11932A will not mary unit protection discharge low pressure I energizes l I Contacts remain un- Logic for unit protectionl I changed initiated EHC trip is I reduced to 1/1 from 1/2

d. TSHH-10115AI-CI/Exhaust IPai1 Low I 'I'SSH-10119A1-Cl will not hood high tomporatura energizes generator-ond tr i p - Contacts remain un" changed

o. LSH-10127A. -28A. -29A/ IPail Low I.SHX-1027A will not Hoisturo separator re- energizes haator drain tank 1A high - Contacts remain un-water level changod

Facilitya Susquehanna Steam Electric Station PAILURE HODES AND EFFECTS ANALySIS Shoot 2 of 3 Docketc 50-387, 50-388 Job No. 0160-004-671 Prepared bye Common Po<<er Supply Control System Affected'D615 or Sensors Recirculation 125VDC Flow Control CSIDc CDs 0160 004-001 0160-004-011 Dates Checked bye Approved bye Rev.

D t Datea ~ 0

~l/

Symptoms and Local Summaryc Summary t Component Name Failure Effects Including System Inherent Effect Upon Ef feet .Upon and Number Node . Dependent Failures Compensating Provision Control System Plant Performance

1. Temperature switch:. Failure of the tempera- Redundant lube oil tem- Loss of automatic com- Loss of recirculation TSll-14021A2 Off ture switch has no local perature indicators and pensation for high lube flow is, caused by the effects a temperature switch- oil temperature loss of flow in loop A alarm combination provide additional monitoring Por recirculation loop A coro flux differenco A, the H-0 set must be will result from the

2. Peedwater system control of Off Loss of bus voltage is No inherent compensating restarted after the bus flow imbalance reactor reci rculaticn system predominant provision for loop A is recovered runback circuitry - recircu-lation Peed<<a flow loop A: Loss of bus voltage Compensation of loop 8 . Control of loop A is re"

a. Feed<<ster low flow: .causes: is limited to a flow established after the

1. PSL-10604A1 , - Low flow runback signal reduction via recircula" restart procedure

2. FSL-1060481 transmitted to auxiliary tion pump 8

3. PS I -10604C1 circuits A and 8 For recirculation loop 8, control may still be

b. to r high le vs 1: Circulating ~ater pump exercised over the re-

l. LSHU-10317A2 trip signal transmitted I circulation pump

2. LSUU-1031782 to auxiliary circuits

3. LSUII-10317C2 A and 8 . Operation of the recir-

4. LSUll-10305A2 culation pump in loop 8

5. LSNN-1030582 Oenerator field breaker must be governed by the 6~ LSUII-10305C2 for loop A will open and criteria for single loop trip the H-0 set (re- operation

c. Condensate pump low dis- circulation pump) charge pressures

1. PSL-10507A Scoop tube for loop A

2. PSL-105078 H-0 set will lock in

3. FSL-10507C position at the instant

4. FSL-10507D the bus voltage is lost

d. Circulating water pump - In loop A, speed control trip circuits circuitry speed limiter 1 ~ COIL 52XI-101US No. 2 is enabled

13. Loop A circuitsc Off Loop 8 controller ad-

a. Under-voltage relay )usts the scoop tube to

b. Lockout reduce H-0 set speed

c. Pump vibration reset

d. Scoop tube power failure lock and reset

e. Auxiliary circuits

f. Uenerator field breaker

Facilitya Susquoimuna Steam Electric Station PAII URE HODES AND EFFECTS AHAI YSIS Sheot 3s of 3 Dockotc 50-307, 50-3SB Job Ho e 0160-004-671 Prepared bye CSID: 0160-004-001 Dates Rov Comaon Power Supply or Sensors 1D615 125 VDC Checked by: Date:

Control Systoa Affected: p ~Rl to ~dT A Co It *1 CDx 0160-004-011 Approved by> Dates Symptoms and Local Summary: Sumaarys Component IIame Pailuro Effects Including System Inhoront Effect Upon Effect Upon snd Humbor Hodo Dopondont Failures Compensating Provision Control System Plant Performance

2. Sequential trips I I

a. ZS-I Ol GOA2-F2, AS-PS/ I Fa i 1 Of f I All contacts aust closo to Position switchos on complete tho sequential lntorcopt and intormodisto trip stop valves-servo valves

b. ZS-1014IA2-D2/Position . I Fail Of f switchos on aain stop valve-servo valves

c. 52XT1-IR101/A-C circuit I Ps i1 Of f Pails to energize and breaker open contactsa

- Causing an interruption in tho gonorator so-quontial trip

d. 33Xl-10141/Position IFail Off I Coil fails to energize Anti-motoring circuit in switch relay - main stop and chango stato of con- unit protection is also vs 1 vo tacts in tho anti-aotoring on 1D615. primary lock-circuit out relays on unit pro-tection bus are disabled Power directional relay fails to energize and coaplete circuit that contains contacts from sequential trip - there-fore, any adverse offocts from the iapropor con-figuration of sequential I trip contacts is elim-inated

3. Prlaary unit protection

a. 060C/Primary lockout I Fail Of Coils do not onorgizo to

-unit protection f'elays close contacts in EIIC and initiate a trip Primary unit protectioon is disablod

Facility: Susquehanna Stean Electric Stetion FAILURE NODES AND EFFECTS ANALYSIS Sheet 1 of 4 Docket: 50-387, 50-388 Job No. 0160-004-671 Prepared bye ,v4 gn ')I Couson Power Supply or Sensors 1D625 125 VDC CSID$ 0160-004-001 Dates l~ /r Rev 0 Checked by: Date: 7 IControl Systen Affected< Reactor Feedwater Control S sten CDa 0160-004-012 Approved bye Dates I Sywptoes and Local Susearyx Sunmaryx Component Naee Failure I Effects Including 'ysten Inherent Effect Upon Effect Upon and Nunber Mode Dependent Failures Conpensating Provision Control Systen Plant Perfornance ll. Reactorcircuit feed pusp turbine 8

- Level 8 trip De-ener- Trip circuit is de-ener- Trip circuits for reactor Loss of ability to trip There is no affect on I trip gized gired feed punp turbines A and turbine B on a Level 8 plant perforsance unless a Level 8 trip condition I

contacts C are powered by other trip signal I Level 8 trip signal cannot DC power supplies exists be processed

Pacility: Susquehanna Steam Electric Station P*ILURE NODES AND EPFECTS ANALTSIS Sheet 2 of 4 Docket! 50-387, 50-388 Job No. 0160-004-671 Prepared bys Common Power Supply or Sensor: 1DG25 125 VDC CSID'160 004-001 Date!

Checked by:

IControl System Affected: Recirculation Plow Control CD: 0160-004-012 Approved by:

Symptoms and Local Summary: Summary!

Component Name Pai lure -Effects Including System Inherent Effect Upon Effect Upon and Number Node Dependent Failures Compensating Provision Control System Plant Performance I 1. Temperature swi tch: IOff Pa i lure of the tempera- Redundant lube oil tem- Loss of automatic com- Recirculation flow is I TSB-1402182 I ture switch has no local perature indicators and pensation for high lube reduced due to the loss effects a temperature switch- oil temperature of flow in loop 8 alarm combination pro-There are no dependent vide additional moni- . Operation of the recir- . A core flux difference failures associated with toring culat!on pump in loop A will result from the the switch failure must be governed by the flow imbalance flow criteria for single Loss of bus voltage is pump operation predominant Control of loop 8 recir-l2. Circuits - recirculation culation is lost and flow loop 8: cannot be re-established

a. Under-voltage relay Off Loss of bus voltage will Recirculation loop A until the bus voltage is cause

- the following: will continue to oper- recovered b- Lockout Uenerator field breaker ate normally for loop 8 will open Control of recirculation

c. Pump vibration reset Reactor runback signals loop A may be exercised The scoop tube for H-0 will be processed in via the master control-

d. Scoop tube power failure set, loop 8 will lock in I the auxiliary and speed ler, H/A transfer station lock and reset position at the instant control circuitry for and speed control cir-bus voltage is lost loop A cuitry

e. Auxiliary circuits No compensation effect

f. Bonerator field breaker - The H-0 set and recir- for the loss of flow in cu lat ion pump for loop loop 8 8

'to will trip and coast a stop

Pacilitys Susquehanna Steam L'lactric Station PAILURE HODES AND EPPE~ ANALXSIS Shoot 3 of 4 Docket: 50-387, 50-388 I

I Job No. 0160-004-671 I Prepared by 0160-004-001 Dates Ro v.

ICommon Powor Supply or Sensors 10625 125 VDC CSIDs I

0160-004"012 Checked by:

Approved bys Dates Date's

~~@

~+fr IControl System Affoctods CDs Symptoms and Local Summarys Summarys Componont Name Pa i lure Effocts Including System Inherent Effect Upon Effect Upon and Number Nod o Dopendent Pailuros Componsating Provision Control System Plant Performance

1. Unit protections I

a. 1R101/Oonorator oil l"ail Off I 52X coil in 1R101 control Initiates tho T/0 trip Tha main generator circuit breaker do" 1R101'il circuit breaker-230kv systom fails to remain signal in the EHC system

- no noad for further anorgizos and trips tho ponos onorgizad turbine relay circuitry T/8 Contacts in breaker aux-iliary SNS2-1 will close Any two energized trip

{normally closed state and alarm switchos .

when da-energized) registering a transient suffictent to change Closed contacts initiate their associated contacts an ENC trip will cause a T/0 trip

2. Trip ansi alarm switchoss Remaining relays bocoma

a. PSL-11981A2, 82/Thrust Pail llighl PSLX-10112A2-82 will not Circuit logic (2/3) pro- arranged in a 2/2 logic boaring uoar detector and energizes vonts inadvertent trip low bearing oil pressure - Contacts remain un- via the instrumentation The generator sequontial changed in logic circuitl circuits trip becomes disabled

b. PSL-101808/Low hydraulic IPail Nigls PSLX10180B will not There are no furthor ac-fluid pressure energize tions or trips tnvolvod

- Contactss remain un- whon the soquontial trip changed in logic circultl is lost

c. PSL-119328/Shaft pump Pail Nigh PSl.X11932B wtll not dischargo-low pressure onorgizas

- Contacts remain un-

, changod in logic circuit

d. TSUN-1011SA2-C2/Exhaust Pail tow I TSNNX-10118A2-C2 will not hood high temperature energizes generator ond trip - Contacts remain un-changed in logic circuit

e. LSll-101278s -288, -298/ Pail tow LSNX101278 will not Hoisturo soparator ona rg i za s roheatar drain tank 18 - Contacts remain un-high water lovel changed in logic circuit

Pacility: Susquehanna Steam Electric Station PAILURE HODL'S AND EPPBCYS ANALTSIS sheet 3a of 4 Docket: 50-387, 50-388 Job No. 0160-004-671 Prepared by:

CSIDc 0160-004-001 Datea Rev Common Power Supply or Sensors 1D625 125 VDC Checked bys Date e,~n,>

R I

IControl System Affectdd:

I c*, - roc,c o> CDs 0160-004-012 Approved bye Date:

Symptoms and Local Summary I Component Name and Number I

I Pailure I

I ffects Including Dependent Pailures System Inherent Compedsating Provision Summarya Effect Upon Control System

~ Effect Upon Plant Performance

3. Sequential trip instrumenta-tion:

a. ZS-10160A2-P2, A5-P5/ Pail Of f ~ Sequential trip disabled Position transducers- by the failure to energize intercept and intermediate 33X2-10141 stop valves-servo valves Contact 5X2T2-1R101 fails to open due to the ina-bility to energize the corresponding coil in the auxiliary circuit

b. ZS-10141A2-D2/Position Pail Of f Same as ZS-10160 transducers - main stop valves-servo valves

c. 52XT2-1R101 IPail Off Pails to energize and 52XTI-IRIOI/Hain generatorl open contact in generator auxiliary relay sequential trip

Facility: Susquohassna Steom Electric Station PAIl UEE NODES AND EFFECTS AllALYSIS Shoot 4 of 4 Dockots 50-387, 50-388 Job No. 0160-004-671 Prepared bys ICommoss Power Supply or Sensors 10625 125 VDS CSIDs 0160-004-001 Dates R ~ 0 I Checked bys D0%,, /.

IControl System Affoctods CDs 0160-004 012 Approved bys D t Syssptoms and Local Summarys Summarys Componont Name Pai lure Effects Including Systom Inherent Effect Upon Effect Upon and Number Hodo Dependent Pailures Compensating Provision Control System Plant Porformanco

1. Volvo control monitor Off Shear valve is inoperative ~ On loss of 125 VDC, TIP Control system returns Unable to perform TIP is automatically with- TIP probo to normally operation Dry gas purgo circuit is drawn housed position inoperative Unablo to obtain core Purther system operation flux readings through is not possible until DC TIP probe power is restored

Facility: Sus<lucl!anna Steam Bloctric Station PAILURB HODL'S AND BFPBCTS ANAfYSIS Shoot 1 of 2 Docket! 50-387, 50-388 Job" No. 0160-004-671 Prepared bys 7/ )>> ~l Common Power Supply or Sensors 10635 125 VDC CSIDs 0160-004-001 Dates Rov. o Checked bys Dates Control System Affected! Roactor Pecdwater Flow Control CDs 0160-004-013 Approved bys Dates I Symptoms and Local Summarys Su!sclary s Component Nemo Failure I Lffccts Including System Inhorent Bffoct Upon Bffoct Upon and Number Hode Dependent Failures Componsating Provision Control System Plant Performance ll. Puodwator flow instrumcnta-

-InAthe 3 element modes If Level 8 trip is I tions zero flow input sig- rcachod, RPPT C will not

a. Pocdwator flow sensor Off Plow signal from sensor 0 nal to the flow control trip duo to tho disablingl train 8/C32-N002 goos to zero for flow circuit causes an in- of tho trip circuit signal processing circuit crease in spood for reactor food pump tur- A Levol 8 trip is possi-

2. Foodwator lovel instrumonta- bine A, 8, and C ble due to the zero flow tions input signal to the flow I

a. Reactor vessel lovel Off Lose C train reactor water In start-up mode thoro control circuit I sonsor C/C32-N004C level signal is no affect

b. Reactor vessel l!igh level Alarm High lovel alarm is armed I Lovel 8 trip logic is Reactor vessel high lovol alarm train C/C32-K624C Armed for Level 8 trip roducod from 2/3 to 1/2 (Level 8) trip is armed and provonts an inad- in train C

3. Reactor feed pump turbine Off Le ve1 8 contact i n t rip vertent trip causod by trip (RPPT) circuit train C circuit not processed a powor failure Circuits are in 1/2 logic Thoro is no affect on tho control system, providing the trip condition is not present

Pacilitys Susguehnnna Stuns Electric Station PAILUIM llODES AHD EPPECTS ANALySIS Shoot 2 of 2 Docket: 50-387, 50-300 Job No. 0160-004-671 Prepared bye Common Power Supply or Sensors 1D635 125 VDC CSID4 0160-004"001 Dates ev O Chockod bye Dates Control System Affected< P ~81 to dT/AC t*i CDR 0160"004-013 Approved bya Dates Symptoms and Local Summarya Summarys Component Name Pa i lure Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dopondont Pailuros Compensating Provision Control System Plant Performance

1. Trip and Alarm switchosa Control logic circuit No trip of EHC occurs

a. PSL-11901A3, 83/Thrust I pail High Coil doss not energize Ci rcu i t log i c ( 2/3) p r e- reduces to a 2/2 logic when powor supply'lost bearing wear detector and I and fails to chango state vents inadvertent EHC system low bearing oil pressure of contacts in EHC logic trip No impact to overall circuit Lovol 8 trip logic is plant performamco reduced from 2/3 to 1/2 will occur

b. PS1.-10100C/Low hydraulic I pail Highl fluid prossure Loss of back-up unit protection

c. PSL-110132C/Shaft pump 1'ail High discharge low pressure

d. rSHH-1019A3-C3/High ex- Pail Low I haust hood temperature generator end

o. Lovel 8 reactor high Armed One third of Lovel 0 trip Lovel 8 trip can still wator lovel trip. train C circuit armed trip T/0

2. Back-up unit protection Off Loss of redundant unit Primary unit protection BGOD protection system remains activnted Back-up lockout relay unit protection

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0 Facilityi Stcam Electric Station PAII.URE WODES ARD EPPEefs ANAl.ySIS Shoot la Docket'usquehanna 50-387, 50-388 Job Ho. 0160-004-671 Prepared bye Common Power Supply or Sensors 1D645 125 VDC CSIDx 0160-004-001 Datos Rov O Checked by: Dates Control System Affected: P ~ll 1 t* iTn carol CDg 0160"004-014 Approved bye Datex Symptoms and Local Summa ry s Summnryc Component liame Pai lure Effects Including System Inhorcnt Effect Upon Effect Upon and Wuml>or Hode Dopcndont Pailuros Compensating Provision Control System Plant Performance 5 ~ ZS-IOI GOAI-PI, A7, C7, E7/ Off Switches aro disabled nnd I Open switchos, close intercept valves l. 3, switches, rospcctivoly and 5 cannot bo proporly positioned

k. ZS-i0140AI-EI, A2-E2/ I Off All position switches Al1 va 1 ves thn t a ro Position switches on bypass valves aro 'oporated by position disnbleds are disabled

~ - Bypass valve cannot bo positioned

1. Valve test logic circuits Off Ho toots on valvos can bo Tho Emergency Trip conducted whilo customer system will close valves, DC is not functioning if activated

m. Lcvol 8 reactor high water Armed One third of Lovel 8 trip Lovel 8 trip can still lovel t r i p, train 8 circui't armed trip T/0 on high level

Pacilitya Susquehanna Steam Blectric Station PAILURV HODBS AND EPPECYS ANAf YSIS Sheet 2 of 2 Docket: 50-387, 50-388 I

I Job No. '1GO-004-671 I

Prepared bye 3~ nY PPI Common Power Supply or Sensor: 1DG45 125 VDC CSIDx 0160"004-001 Dates Re v.

I Checked bya Datea Control System Affcctcds Reactor Peedwater Control S stem CD: 0160-004-014 Approved bye Dates I I Symptoms and Local Summary: Summary:

Component Name I Failure Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating ProvisionA Control System Plant Performance

l. Peedwater level instrumenta- If level A is selected For level A selected, tions as input to the control there is no affect on

a. Reactor vessel level I Off If 8 is selected, the If level A is selected system, there will be no plant performance sensor train 8/C32-N0040 level signal input to the as input to flow control affect on the control flow control circuit goes circuit, there is no system For level 8 selected, to zero effect on the resulting the higher steady state control signal If level 8 is selected reactor vessel water Level signal input to as the input signal to level may result in flow control circuit be- A and C train input sig- the control system, a Level 8 trip of reactor comes zero nals to Level 8 trip cir" zero level signal results feed pump tu'rbtnes A, 8, cuit are not enabled inc and C

-Reactor feed pump tur-

b. Reactor vessel high level Armed Loss of power to alarm bine speed will increase alarm/C32-K6240 enables 1/3 logic of causing a high steady the Level 8 trip circuit state reactor vessel level to compensate for the low level signal Level 8 trip logic (2/3) is reduced to 1/2 logic due to arming of the 8 train portion of the Level 8 trip circuit

Pacilitys Susquehanna Stoam Electric Station PAILURE NODES AND EPPECTS ANALYSIS Shoot 1 of 17 Dockots 50-387, 50-388 I Job No. 0160-004-671 I Prepared bys ICommon Power I

Supply or Sensors 1Y218 120 VAC CSIDs 0160-004 001 Dates Checked bys Rov Dates I-'I i 5 IControl System Affoctods Nuclear Pressure Relief CD: 0160-004-015 Approvod bys Dates Symptoms and Local Summarys Summa ry Componont Nano Paiiufo Effects Including System Inherent Effect Upon fact 'f Upon and Number Node Dopondant Pailures Compensating Provision Control System Plant Performanco

1. Temperature monitoring/leak There are no inherent Loss of safety relief Loss of ability to moni-detection subsystems compensating provisions volvo leakage detection tor for downstream leak-

a. Thormocouple/1N004 0, N, As Is Loss of signal to s~itch age from safety relief K, H, N, A, 8, C, 0, E, in RG14 Loss of high temparaturo valve P, N, P, R, S signal to annunciator circuit Loss of temperature in-

b. Temperature recorder/R614 I Off ~ Loss of high temperature dication downstraass of alarm indication Loss of tomporature in- safety raliof valvo dication/leak detection

Pacilitys Susqueha>>na Steam Electric Station PAILURE NODES AND EFPECTS ANAlYSIS Sheet 2 of 17 Docket! 50-387, 50-388 Job No. 01GO-004 G71 Prepared by!

Common Power Supply or Sensor< 1Y218 120 VAC CS ID! 0160-004 001 Date! /~ a.

Checked by< Date; Control System Affected! Pressure Be<iulator - T 0 Control CD! 0160-004-015 Approved by: Date!

Symptoms an>eluding System Inherent Effect Upon Effect Upon and Number Ho<le Dependent Failures Compensating Provision Control System Plant Performance I I. Level 8 trip circuit for One third of Level 8 trip Level 8 trip logic re- No affect on plant I T/0 train A circuit armed duced from 2/3 to 1/2 performance

Facilityc Susqucha>>na Stcam Electric Station PAILURE NODES AND EPFECTS ANAIYSIS Sheet 3 oE 17 Dockot: 50-387, 50-388 ICommon Power Supply or Sensor: 1Y218 120 VAC CSID$ 0160-004-001 Job Ho.

Prepared by>

Datoa

? )j~

r e~ 0160-004-671 Rov I Checked bye Datet IControl System Affected: Reactor Paedwater Flow Control CD) 0160-004-015 Approved bye Datos Symptoms and Local Summarys Summary\

Component Name Pa i 1uro Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Failures Componsating Provision Control System Plant Porformanco

l. Fcadwater Elow control in- Loss of fcedwator flow In start up or at power, strumantationc signals and automatic tho RPPT H/A controls

a. Paedwator flow sensor IOff Zoro output trains A, C control in 1 or 3 element are disabled C32-N002A, C I mode I Foedwater flow remains

b. Steam flow sensor I Of f Zero output all trains Loss of steam flow invariant duo to a "Speod Froozo" C32-H003A, 8, C, D signals

c. Reactor water level sensor Off Zero output train A Two lovel sonsors remain Loss of entire instru- Peedwatcr flow regulation C32-H004A on 2/3 logic for reactor mentation loop connected I is unavailablo duo to thol water level (lovol 8) to SRUs 1, 4, and 5 I loss of tho start-up

d. Reactor prcssure levol Off Zero output trip I valve control station C32-H005 At low flow, control I system fails to regulate I. Reactor runback signal

e. Hain turbine first stage Off Zero output flow transmitted to tho ro-circulation system prcssuro. stoam flow C32-N007 H/A control of RPPTs via a single control signal Prior to tho Lovol 8

f. Roactor pressure sensor IOff Zero output is lost trip. tho RPPTs may bo C32-H008 terminatod only via an All control of individual! operator-initiated trip

g. Square rootor Off Zero output RFPTs within tho feed-C32-K605 wator control system is Soo sheet 16 for the C32-K606 disablod offccts on tho recircu-lation system

h. Oain and bias control Off Zero output Active trip system is reduced to 1/2 logic Reactor vossol high

i. Dias/gain stcam flow sig- OEE Zoro output water lovel ( La vol 8) trip is possible if nal/C32-K603 Any additional alarm will trip tho system "Speed Proozo" occurs at Reactor

5. Hain and bias inputs/ Off Zero output maximum demand.

C32-K602 "Spood Praozo" initiated I vassal low lavol (iovol via tho I C-12730/electric 2) trip is possible if

k. Proportional ampl ifier/ Off Zero output automatic positionor on "Speed Frooro" occurs at C32-K616 (summer) each RFPT minimum demand

1. Dynamic Couponsator/ IOf E Zoro output C32-K649 I

m. Punction generator/ OEE Zoro output C32-K630

Pacilitys Susquehanna Steam Electric Station PAILURE MODES AHD EPPECTS AHALYSIS Shoot 3a of 17 Docket s 50-387, 50-388 Job Ho. 0160-004-671 Prepared bye 0160-004-001 0 Common Power Control System Affected'Y218 Supply or Sensors 120 VAC Reactor Paodwator Control S stem CSIDs CD) 0160-004-015 Dates Checked by<

Approved bya ~

Rove Dates Dntea Symptoms and Local Summaryc Summarys Component Hase I Pailure Effects Including System Inherent Effect Upon Effect Upon and Number Modo Dopendent Pailures Compensating Provision Control System Plant Performance

2. 24V 08 power supply: Off Zero output power to the

a. C32-K611 individual instrument

b. C32-K612 loops

c. C32-K613

3. Control stationsx

a. Low flow demand signal Off Loss of auto/annual con-logic/C32-K645, K646 trol of the foedwatar start-up control valve

b. Paadwatar demand signal Off Loss of all auto/manual "Speed Freeze" is ini-(I or 3 element levol control of feadwater tiatod when tho control control)/C-32-K633, K634, control system signal is lost K653

c. RPPT logic control/ Off Loss of auto/manual con-C32-K637, K638A, 8, C trol associated with each

~ RPPT - Ho speed freeze override availablo in faadwater system

d. A/A transfer station/C32- Off Loss of transfer station R600, R601A, 8, C, R602 due to failure of asso-ciated devices powered by 1Y218

4. Alarmss

n. Recirculation loop pump Pal 1 Low Transmits a low-low run-cavitation interlock/ back signal to the re-C32-K618 circulation system

b. Peodwater pump interlock/ Pail Low Transmits n trip signal to recirculation loop flow tho recirculation system reduction alarm/C32-K628

c. Steam flow lovel/C32-K608 Pail Low Transmits a low flow sig-nal to the computer

Pacility: Susquehanna Steam Electric Station FAILURH HODBS AHD BPPBCTS ANALYSIS Sheet 3b . of 17 Docket: 50-387, 50-388 I 0160-004-671 I

Job Ho.

I Prepared by:

ICommon Power I

Supply or Sensor: IY218 120 VAC CHID:

CD:

0160-004-001 0160"004-015 Date:

Checked by:

Approved by:

Rev ~

Date:

Date:

~-I

~ I~.l .I IControl System Affected: I I

I Symptoms and Local Summary: Summa ly I

Component Name Pailure I Bffects Including System Inherent effect Upon Bffect Upon and Number Hode Dependent Failures Compensating Provision Control System Plant Performance

d. Bi-level alarm/C32-K635 IPail Highl. High and low level annun-land Low I ciators for reactor water I level are energized on.

I the control room display I panel I

e. High reactor water level I Fail Highl . Train h alarm indicates . High water level logic turbine trip/C32-K624A -I high reactor water level (2/3) prevents inad-I vertent trip with arming I I of train h alarm I

f RPpT control signal loss/ IPail Dif-l. The alarm for the loss C32-K607 Iference of contiol signal is I armed

. A 'Speed Freeze is initiated

Electric Station PAILURE KODES AND EPPECTS ANALYSIS Sheet 4 ot 17 Pacility: Susquehanna Steam Docket: 50-387, 50-388 I 0160-004-671 I

Job No.

I Prepared by:

ICommon Power Supply or Sensor: CSID: 0160-004-001 Date Rev. D .I Checked by: Date: 'j'Q21fpi.l I

IControl System Affected: erector r *teeter Control ~s er.en CD; 0160-004-015 Approved by: Date: r~Pgg/..

I Symptoms and Local Summary:- Summdrye I

Component Name I Failure I Effects Including System Inherent Effect Upon Effect Upon and Number I Node I Dependent Pailures Compensating Provision Control System plant Performance I

Il. a. K6058/Steam signal square IOff Loss of signal input, zerol Loss of signals will in- . Runback sit3nals sent to I rooter I output from 8 train to I duce feed pumps to in- recirculation system I controller crease flow in 3 element I

I control . Optimum water level may b: K6068/Feedwater flow IOf f not be maintailwu by signal square rooter I . Automatic control for automatic control train 8 and C feed pump l2. K6078/Peed pump 8 speed I

IPail Lossl. Loss of automatic signal Speed Freeze'n train is lost Initiation of a 'Speed control signal loss lof Signall input to the auto posi- 8 initiated Preeze't high pump I

I I tioner for feed pump 8 . Trip signals transmitted I speed may result in a.

I I I to recirculation system I high level (Level 8)

I l3. a. K6188/Recirculation loop IPail Low I. Runback signal transmittedl. Ho compensating devices I trip pump cavitation interlock I I to recirculation system . Ho manual override of I I

alarm 'Speed Freeze'ircuit I Initiation of a 'Speed I

I I

I is available on RPPT 8 I Freeze't low pump

b. K6288/Peedwater pump trip IPai1 Low and C I speed may result in u interlock/runback signal I

I low level (level 2) trip I to recirculation system . RPPT speed is increased I I due to the loss of train I I l4. K6308, C/Function generator IOff . Zero output signal 8 signal I I I I I I

IS. K6378 & C, K6388 6 Ci IOf f . Loss of all automatic and I. 'Speed Preeze'n feed I I I K6388-1 6 c-l, R6018 rr c/ I manual control of reactor I pumps 8 6 C initiated I I Peed pump manual/auto trans- feed pump turbines 8 and Cl I I fer control station I I

I I

I I

I I

I I I I I I I

Pacility: Susquehanna Steam Electric Station PAILURE HODES AHD LPPECTS AHALYSIS Sheet 5 of 17 Docket: 50-387, 50-388 I Job Ho 0160-UU4-671 I Prepared by:

I

[rosooo possr soppiy or ssosor: ~1Y218 lyo Y~AQ ro ory-rory yrvooL CSID: 0160-004-001 Date: -/

-ry y P~ Hev ~

Checked by: Date; I

Reactor Peedwater Control stem CD: 0160-004-015 Approved by: Date:

IControl System Affected: S I Symptoms and Local Summary: Summary:

Component Hame I

I Pailure Effects Including System Inherent Effect Upon Effect Upon and Humber Hode Dependent Pailures Compensating Provision Control System Plant Performance I

ll. a. K606A/Peedwater flow h )Off Control signals are lost . Ho compensating devices Input signals via auto- Low flow runback signal square rooter from train A, matic monitoring of the transmitted to the re-reactor water level are circulation system

b. K616/Proportional ampli- Off Input signals to the levell lost - level controller fier controller are lost I cannot be operated in I the auto mode

c. K630A/Punction generator Off Input signals to each feed) train h pump control station are Initiates a 'Speed reduced to zero Preeze'n trains A, B,

d. K605A/Steam flow h square IOf f and C rooter I of all or I . Loss 1 3 mode I2. K624A/High level turbine IPail Highl Pails in high water level I. Trip logic I2/3) pre- level control trip alarm I mode I vents an inadvertent Level 8 trip resulting . Hanual or automatic con-I I ~ Level 8 trip logic Il/3) from a power failure trol of all 3 feed pumps I I is armed from a single station I I cannot be exercised I I3. K607A/Alarm for feed pump IPail Loss). Pails in 'Speed Ho compensating device I control signal loss lof Signall Preeze'rientation needed . Loss of manual override I I of feed pump h I I I4. K633, 634, 634-1, 653, R-600/ IOff . Since input signals are . Each pump can be con- ~ Por conditions of low Ievel controller reduced to zero, all trolled by separate feedwater flow demand, control of feedwater automatic control is lost manual control stations flow cannot be performed

. Hanual control of all 3 Auto mode is disabled via the start-up valve feed pumps from a single for all pumps control station is un- Hanual override of available 'Speed Preeze'or RPPT 8 and C is available

)5. K637Ap 638A, 638A-1, R-601A/ )Off . All automatic/manual 'Speed preeze's ini-I Peed pump A manual/automatic I control of feed pump A tiated I transfer control station I is lost I

le K645 ~ 646 '46 1 R602/ Off . Por low feedwater flow, Low flow conditions will I I

~

Start-up, low flow control manual/automatic control be altered by manual station of the start-up valve is control of feed pump lost turbines

4 Pacility: Susquehanna Steam Electric Station. PAILURE HODES AND EPPECTS ANALYSIS Sheet ba of 1'/

Docket: 50-387, 50-388 I

I 0160-OU4-671 I

Job No. I Prepared by: I I

ICommon Power Supply or Sensor: lY218 120 VAC to C32-K612 24VDC CSID: 0160-004-001 Date: Hev. o Checked by: Date: ~3~g ~~I I

[Control System Affected: Reactor Peedwater Control S stem CD: 0160-004-015 Approved by: Date: /> pg I

I I Symptoms and Local I Summary: Summary; Component Name I, Pailure Effects Including System Inherent I Effect Upon Lffect Vpou and Number I Hode Dependent Pailures Compensating Provision Control System Plant Performance l7. a. K618A/Recirculation loop IPail Low I. Runback signal is trans-pump cavitation interlock l I mitted to the recircula-I I tion system I I

b. K628A/Peedwater pump trip IPail Low )

interlock/runback signal I to recirculation system I I

I I

2 I

Pacility: Susquehanna Steam Electric Station PAILURE HODES AHD EPPECTS AHALYSIS Sheet 6 of 17 Docket: 50-387, 50-388 I 016U-UU4-6/1 I

Job Ho.

Prepared by:

I ICommon Power Supply or Sensor: 1Y218 120 VAC to C32-K613 24VDC CSID: 0160-004-001 Date: o I I

Checked by: LY. 2 &..~

IControl System Affected: Reactor Peeduater Control S stem CD: 0160-004-015 Approved by:

I I Symptoms and Local Summary: Summary; Component Same Pailure I Effects Including System Inherent Effect Upon Eftect Upon and Humber Hode Dependent Pailures Compensating Provision Control System Plant Performance I I

ll. a. K602/Steam and feedwater )Of f . All output signals yo to Ho compensation is avail-I. In 1 element mode, a . Recirculation system signals gain and bias I zero able or necessary I loss of bias and gain receives a lou f lou I

I has no consequence runback signal due to I

b. K603/Steam flow signal lOff the loss of the feeduaterl gain and bias I In 3 element mode, the . flow siynal level controller output I

c. K615/Peedwater signal I

lOf f will initiate a speed Level 8 trip may be ini-gain and bias I increase of all 3 feed tiated as the result of I pumps speed increase of feed-

d. K605 CED/Steam flow C and lOf f water pumps D square rooter . Automatic control for feed pump C is I.ost . Tl)e speed of pump C can-

e. K606C/Peeduater to train Off not be increased due to C square rooter the 'Speed Preeze'.

K649/Dynamic compensator IOff I

12. K635/Bi-level trip alarm I Pail Lou I Annunciators for high and I. same as item 1 I lou reactor water level I are energized in the con-I trol room I

l3. K636/High pressure alarm I Pail High I . Annunciator for reactor . Same as item 1 I I I high pressure is energizedl I I I l4. K608/Steam level alarm IPail Low I. Low flow signal is trans- . Same as item 1 I I I mitted to computer I I I IS. K607C/Peed pump speed signal (Pail Loss(. 'Speed Preeze'ignal is Speed Preeze'ircuit I loss alarm unit lof Signall transmitted to the elec- is available for train C I I I tric automatic positioner when in the auto mode I I Hanual override of I I 'Speed Preeze'vaila-I ble

4 Pacility: Susquehanna Steam Electric Station FAILURE HODES AND EPPECTS ANALYSIS Sheet 7 ot 17

t ~

Docket: 50-387, 50-388 I 016U-UU4-671 I

Job No.

I Prepared by:

ICommon Power Supply or Sensor"r 1Y218 120 VAC CSID: 0160-004-001 Date: l. Rev.

I Checked by: Date:

IControl System Affected: Reactor Hanual Control S stem RHCS CD: 0160-004-015 Approved by: Date:

I I Symptoms and Local I I Summary: Summary:

Component Name I Failure I Effects Including System Inherent I Effect Upon hffect Upon and Number Hode Dependent Pailures Compensating Provision Control System Plant Performance SUHHARY REACTOR NAHUATL CONTROL SYSTEH ll. Rod control unit operating IOff . See sheet 9 . Control rods cannot be Pull core display is not Control rod movement is I benchboard operated due to a loss available not possible:

of pouer to these sub- Power changes cannot I

12. Rod position information Of f See sheet 10 systems . Operator signals-cannot be made I system be transmitted to rod

~

drive control Rod testing cannot be I I

13. Rod sequence control system IOff . See sheet 8 accomplished (if in I I I . Rod ppsition information progress) I l4. Trip unit, turbine pressure IOff . See sheet 12 is not available I I I I I

IS. Scram time test panel I

IOff I

. See sheet ll Rod sequence control is de-energized I

I I

l6. Control rod drive hydraulic IOff . See sheets 13, 14 control I . Rod movement limitation associated with RCS are still imposed

. Scram timing test cannot be operated

Pacility: Susquehanna Steam Electric Station PAILVRE RODES ARD EPPEerS ARALYSIS Sheet 8 of 17 Docket: 50-387, 50-388 I 0160-Ou4-671 I

Job Ho.

I Prepared by:

IY218 120 VAC CSID: 0160-004-001 Date: Ruv. D ICommon Power Supply or Sensor:

Checked bye I

lControl System Affected: Reactor Iraaaal C trot ~s stea~RHCS CD: 0160-004-015 Approved by: . Date: /ATE P I

symptoms and Local Summary: Summarye Component Rame Pailure I Effects Including I System Inherent Effect Opon Lfrect Upon I and Rumber Rode I Dependent Pailures Compensating Provision Control System Plant Performance I

,I I

1. Rod sequence control system/ . See summary sheet page 1 l . Rod block function with- . RsCS rod movement limita-l p659: I draw and insert signals tions are invoked: I

a. RSCS page lOff . Loss of timing and gating l to input isolation of 1. Prevents out-of-I signals RDCC are activated sequence rods from I being moved I . Loss of test signals I 2. Limits movement ot

b. Rod pattern controller lOff . Loss of memory circuitry out-of-sequence rod processing

. Rod block contacts open if closed and remain open if already open I I

I

Electric Station PAILURE HODES AUD EPPECYS AUAIYSIS Sheet 9 of xI Pacility: Susquehanna Steam Docket: 50-387, 50-388 I

I U160-U04-671 I

Job Uo. .I I

Prepared by:

ICommon Po~er Supply or Sensor: 1Y218 120 VAC CSID: 0160-004-001 Date: Ruvo Checked by: Date:

I IControl System Affected: a actor nannal control a~stem anon CD 0160-004-015 Approved by: Date:

I I Symptoms and Local Summaryr Summary:

Component Name I Pailure Effects Including System Inherent Effect Upon Effect Upon and Uumber Node Dependent Pailures Compensating Provision Control System Plant Performance

1. Rod control unit operating . See summary sheet page 1 I . Lose full core display Loss of ability to selectl and move control rods benchboard/P6804 module I

a. Pull core display module IOff . Loss of full core display I Lose rod select switch I

I I

b. Rod select switch assemblylOff . Switch assembly inopera- assembly I I tive select and I

I . Lose rod I

c. Rod select and transmitterIOff . Signals cannot be trans- transmitter module- I module mitted to rod drive con- cannot transmit to rod I trol drive control system . I I

. Lose rod worth minimizer I operator panel - initia-tion

Electric Station FAILURE NODES AND EFFECTS ANALYSIS Sheet 1u of 17 Facility: Susquehanna steam Docket: 50-387, 50-388 I

I Job No.

I prepared by:

1Y218 120 VAC CSID: 0160-004-001 Date: <<<<<<. <<

)Common Power Supply or Sensor: Checked by:

I (Control System Affected: <<*a<<<<<<<<<<a <<al C<<<<<<<<1 ~St* R<<jCS CD 0160-004-015 Approved by:

Symptoms and Local Summary: Summaryr Name I

.I Failure

)

) Effects Including System Inherent Effect Upon Effect Upon I'omponent and Number Node Dependent Pailures Compensating Provision Control System Plant Performance I

ll. Rod position information See summary sheet page 1 I . Lose rod position output . Control rod position system/P615: to scram time test panel I cannot be monitored

a. Control module - control )Off . All electrical control file, multiplex file signals are de-energized . Lose rod position output I

I (control file) to 4 rod control file I

I . Rod position indicator I

i,ose 'Rods In'ignal to I I probe signals are not pro-( refueling hoist controI I cessed I I I . Lose rod position in-

b. Nultiplex module (2) (off . Rod position indicator I dication probe signals are not pro-)

cessed

Facility: Susquehanna Steam Electric Station PAILORE HODES AHD EFFECTS ANALYSIS Sheet li of Docket: 50-387, 50-388 I Job Ho. 016U-UU4-671 I Prepared by:

I 1Y218 120 VAC CSID 0160-004-001 Date: Hev ~

ICommon Power Supply or Sensor: Checked by: Date:

I Reactor Hanual Control stem CD: 0160-004-015 Approved by: Date; IControl System Affected: S RHCS

'I Symptoms and Local Summary: Summary; I

Component Hame i Pal lure Effects Including System Inherent Effect Upon Lffec.t Upon and Humber I Hode I Dependent Pailures Compensating Provision Control System Plant Performance I

l. Scram time test panel/P610 Off . Loss of rod position/ See summary sheet page 1 I. Loss of ability to meas- Hormal operation of I I

movement signal from the ure scram time for con- control rods is not I rod position information trol rods affected - scram testing I system function is lost I I

Loss of input from the master clock from RDCC P616 Loss of scram test signal from the output isolation of RDCC F616

~ Loss the of scram signal processing input to scram time test panel from reactor protection

Pacility: Susquehanna Steam Llectric Station PAILURE HODES AHD EPPECTS AHALYSIS Sheet 12 of 17 Docket: 50-387, 50-388 I

I Job Ho.

I Prepared by:

ICommon Power Supply or Sensor: 1Y218 120 VAC CSZDr 0160-004-001 Date:

I Checked by:

IControl.System Affected: Reactor nan at Control ~Sstes ~Rs~CS CD 0160-004-015 Approved by:

I I I Symptoms and Local Summarye Summary: I Component Hame I Pailure I Effects Including I System Inherent Effect Upon Effect Upon and Humber Hode Dependent Pailures Compensating Provision Control System Plant Performance I

I I ll. Trip unit first stage turbineI . See summary sheet page 1 I pressure transmitter Hod movemeut limitations of HSCS are still presuntl I

press/P613 I signals are not processed

a. SRU-1 Off instrument loop is de- even atter low power set-I energised . Trip unit signal is not point is reached: I bypassed when low power l. Cannot move out-ot- I

b. Press indicating switch/ IOff . Contacts in switch remain I set-point is reached- sequence rod I PIE-1B654hc 8 I open I signal is not sent to I I I RSCS P659 2. Limits movement of I

c. Pressure transmitter/ IOff . Signal from transmitter isI in-sequence rod PT-18054hc 8 not processed

Electric Station PhILURE NODES hND EPPECTS hNhLYSIS Shout 13 of 17 Pacility: Susquehanna Steam Docket 50 387s 50 388 I

I Job No. .I I Prepared by: .I I

ICommon Power Supply or Sensor: 1Y218 120 VAC CSIDx 0160 004 001 Date:

I Checked byr IControl System hffected: Reactor Hanoal Cont~col S t~RH~CS CD: 0160-004-015 hpproved by:

I Symptoms and Local Summary: Summarya Component Name I

I Pailure I Effects Including System Inherent Effect Upon Effect Upon and Number Node Dependent Pailures Compensating Provision Control System Plant Performance I

Il. Control rod drive (CRD) . See summary sheet page 1 I Loss of automatic flow . Normal control rod move-hydraulic control: control capability. ment cannot be accom-plished due to loss of

a. Plow control station Off . Loss of system flow in- normal control rod drive I 10-009h/0:

I dication hydraulic control in- I

1. PE-1N003/Plow element . Loss of power does not strumentation I effect flow element . Differential pressure I indication required to I

2. PC-1R600/Controller . Controller does not send properly ad)ust drive I signals to converter water pressure control I valve is not available I

3. PY-IK001/Converter . Converter does not re- I position to allow control I . Cannot maintain proper air to reposition air- differential pressure operated valve between reactor .vessel and drive water header

4. FT-1N004/Plow trans- Plow signal is not trans-mitter mitted to controller Loss of alarm indication I for high charging water

5. 18600/Power supply Loss of power (hC to DC header pressure conversion) to control/

instrument loop

b. Drive/cooling water pres- I Off sure control:

1. PDT-lN011/Differential Loss of transmitted pressure differential pressure (reactor coolant/drive water header) downstream of pressure control station

2. PDT-1N008/Differential I ~ Loss of transmitted pressure differential pressure upstream of pressure control station

Electric Station FAILURE HODES AHD EPFECTS AHALYSIS Sheet <4 or 17 Facility: Susguehanna Steam Docket: 50-387, 50-388 I 0160-OU4-671 I

Job Ho.

I Prepared by:

ICommon Power Supply or Sensor: 1Y218 120 VAC CHID: 0160-004-U01 Date: Hev ~

Checked by: Date:r Date:

~g~/~

1 (Control System Affected: R a t*r Ran al Co carol ~Sstew~RN~CS CD 0160-004-015 Approved by:

I Symptoms and Local Summary: Summ4TY'ftect Component Hame Failure Effects Including System Inherent Effect Upon Upon and Humber Hbde Dependent Failures Compensating Provision Control System Plant Performance

3. PE-1H010, FT-IH009/ . Loss of cooling water Cooling water flow flow indication

4. IK600/Power supply . Loss of instrumentation/

control loop for pressure I control I I

5. FE-lH006, FE-1H007/ . Loss of drive water headers Drive header flow flow indication

c. Charging water header lOff pressure instrumentation:

1. PT-1H005/Pressure . Loss of charging water I transmitter pressure signal to switch I

2. PISH-1H600/Pressure I . Loss of high pressure switch signal to alarm

3. PAH-14604/Charging . Loss of alarm signal water high pressure indication alarm

Pacility: Susquehanna Steam Electric Station PAILURE NODES AND EPPECTS htthLYSIS Sheet lb ot 17 Docket: 50-387, 50-388 I

I Job No. 0160-UU4-671 Prepared by:

I Supply or Sensor: 1Y218 120 VAC CEIL 0160-004-001 Date: IRj R~IRR 'r.

ICommon Power Checked by: 'ate:

R IControl System Affected: Reenter Mater ~cl an ~ate ~Race CD: 0160-U04-015 Approved by: Date:

I I I I Symptoms and Local Summary I Summaryr Component Name I Pailure I Effects Including System Inherent Effect Upon Efrect Upon and tlumber Node Dependent Pailures Compensating Provision Control System Plant Performance If l I

1. Differential flow instrumen- . RHCS system isolation . RHCS system will continue tation: protection (in event of to operate normally I

a. PT-1N036-RHCS inlet flow IOf f . Instrument loops de-ener- , RHCS Leak Detection high differential flow system leakage is preseutl PT-1N012-RWCS blowdown I gized System due to RHCS system isolation will be pro-flow I I leakage) is lost vided by the RHCS Leak PT-lt(041-RWCS return flow I . Signal processing lost I Detection System SRV1 I

. Signal to isolation valvesI NV-lP001, NV-1P004 lost

Fhcility: Susquehanna Steam Electric Station PAILURE HODES AND EFFECTS ANALYSIS Sheet re of I I Docket: 50-387, 50-388 I

I Job No. 6U-004-671 I Prepared by:

ICommon Power Supply or Sensor: 1Y218 120 VAC CSID: 0160-004-001 Date:

I Checked by: Date IControl System Affected: Recirculation Flow Control CD: 0160-004-015 Approved by: Date:

I Symptoms and Local Summary: Summary:

Component Name I Pailure Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating Provision Control System Plant Performince

1. Recirculation flow control Speed controls for both . Recirculation flow rate system: recirculation pumps are maintained at the value lost until: prior to lose of bus

a. H/A transfer station and IOff Loss of the bus voltage I. Scoop tube locking cir- - Hanual speed ad)ust- . voltaye I speed control for Loop h I causes the following to I cuitry permits recircu- ments are made I I become inoperative: I lation pumps h and 8 to . Variation of the reactor I H/h transfer station and IOff maintain the flovs prior - Bus voltaye is power Level cannot be speed control for Loop 8 I Haster Controller to loss of bus voltage recovered performed unless the re-I H/h Transfer Stations circulation flow rates Haster Controller IOff A and 8 Hanual adjustment of the I. Reactor runback signals are altered via manual

- Speed Control Circuitry I recirculation pump speed I cannot be processed positioniny of the scoop I for Loops h and B I can be performed at the I tubes I H-G sets through posit-

. The fallowing reactor run-I ioning of the scoop tubesI back signals are trans-mitted to auxiliary cir-cuits h and 0:

- Lov flow from feedwater system alarm/relay

- Low NPSH from feedwater system alarm/relay

~ Runback signals cannot be I processed because of the loss of the above compo-nents

. Scoop tubes on the H-G sets A and 0 vill lock in I their last positions priorI to the bus failure

- Recirculation pumps maintain previous speedI Indicators for speed and speed set point indicate zero

Electric Station FAILURE MODES AHD BPPECTS AHALYSIS Sheet 17 of 17 Pacility: Susquehanna Steam Docket: 50-387, 50-388 I

I Job Ho. 016u-004-671 .I I

I CSID: 0160-004-001 Prepared Date:

by: .gfl" yl I

(Common Power Supply or Sensor: 1Y218 120 VAC S>l 1 Checked by:

I IControl System Affected: CD: 0160-004-015 Approved by: Date:

I I I I Symptoms and Local I I Summary: I Summary:

I Component Hame Failure Effects Including I System Inherent Effect Upon I Effect Upon and Humber Mode Dependent Pailures Compensating Provision Control System Plant performance I

l. TIP control and monitor: . Cannot record TIP flux . Loss of ability to I I

signals vs detection . operate TIP - Core flux

a. Plux probe monitor/J600-2 lOff . Plux detection processing . TIP can be isolated position levels cannot be obtainedl circuit is de-energized- through either of the I Ho signal input to X-Y following: Loss of flux signals to recorder Isolation signal from process computer primary containment

b. X-Y recorder/J600-1 I Of f . Plotter drive circuit is reactor vessel iso- . Loss of control capabil-.

I de-energized lation system ity to successfully pro-cess signals to the drivel

c. Drive control unit/

I lOf f . Control circuit for pro- - Manual isolation and indexing mechanisms J600-A-B I cessing signals to the through shear valve I drive mechanism and in- operation powered off I dexing is de-energized DC I

d. Valve Control Monitor- 10f f . Mechanism, computer and Purge circuit X-Y recorder pen lift

Pacility: Susquehanna Steam Electric Station PAILURE MODES AMD BPPECTS AMALYSIS Sheet 1 of 2 Docket: 50-387, 50-388 I

I Job Mo. U160-004-671 I

.I I

Prepared by:

ICommon Power Supply or Sensor: IY219 120 VAC CSID: 0160<<004-001 Date:

Checked by:

I 0160"004-016 IControl System Affected: Reactor a naal Con~trol a at n CD: Approved by:

Symptoms and Local Summary: Summary:

Component Hame Pailure Effects Including System Inherent Effect Upon Bftect Upon and Number Mode Dependent Pailures Compensating Provision Control System Plant Performance I

ll. Control Rod Drive Temper aturel . There are no inherent . Temperature signal from . CRD temperature infOrma-I Monitoring: I compensating provisions the thermocouple is not tion is not available I processed through the I

I a. Thermocouple TC-(185) I IU'A . Thermocouple signals are temperature circuitry . Potential CRD high temp-I I not processed erature condition cannot I . CRD temperature monitor- be detected

b. Recorder R018 IOf f . Recorder is de-energized ing/recording is not available

Electric Station FAILURE HODBS AHD EFPFCTS ANALISIS Sheet 2 of 2 Pacility: Susquehanna Steam Docket: 50-387, 50-388 I Job Ho.

I Prepared by:

I ICommon Power Supply or Sensor: ly219 120 VAC CSIDl 0160-004-001 Date: D 0160-004-016 Checked by:

Approved by: Datet

~z J~:::

l Control System Affected: Reactor water clean~us~stem {Rw~cs CD:

I I

Symptoms and I,ocal Summary: I Summary:

I Component Name I Pailure Effects Including Systeta Inherent I Effect upon I .Effect Upon and Number I Hode Dependent Failures Compensating Provision Control System Plant Performance l I

I

1. Liquid radwaste/main conden- Nortaal operation of the Loss ot ability to uirecc I ser flow control instrumentsll RWCS is not effected RWCS liquid to either I

a. PSL-ltl013, PSH-1N014 IOff . Plow control solenoid . Normal system flow returnl main condenser or liquid I SV-14438 valve SV-14438 de-ener- to feedwater system is I . Automatic operation of radwaste system I I

gizes 'shutting flow con- still available isolation valve to the condenser or liquid rad-I trol valve to condenser/ is not liquid radwaste system waste system available

. Pressure switch signals I high or low have no affectl . High temp. shutoff pro-on solenoid valve since I tection for RWCS pump is I it is already closed on I loss of power lost I I

. Ability to monitor key I

2. RWCS pump cooling water high I RWCS temperatures is lostl temperature shutoff: I I

a. TE-lH001A, B, IOff Instrument loop de-ener- . No inherent compensating I TISH-lt{002hiB gized effect I

. High temperature annun-ciators are inoperative

3. RWCS temperature monitoring: I

a. TE-1N004/Inlet, tempera- IOff Instrument loop is de- . No inherent compensating I ture energized effect I TE-ltl015/Outlet, tempera-ture T 8-1tl019/Non-r e gene rat ivs

- heat exchange effluent TE-1N006/Regenerative-heat exchanges effluent TB-1N043/Reactor bot tom head drain TT-ltl045/Temperature transmitter

Pacility: Susquehanna Steam Electric Station PAILURE NODES AND EPPECTS ANALYSIS Sheet 1, of 2 ..

Docket: 50-387, 50-388 I

Job No. 0160-OU4-I'll I

I ICommon Power Supply or Sensor: 1Y226 120 VAC CSID: 0160-004-001 Prepared by:

Nev ..

system Affected: Nuclear Pressure Relief CD: 0160-004-017 4'ontrol I I Symptoms and Local I Summary: Summary Component Name +I Pailure Effects Including System Inherent Effect Upon Effect Upon and Number I Node I

Dependent Pa i lures Compensating Provision Control System Plant Performance I

I Il. SRV flow monitoring/DIV. II: I . Division I Safety Relief . Loss of Division II . Operator is unable to monitor safety relief valve flow monitoring Safety Relief Valve flow I system is still available)

I

a. Vibration transmitter IOff . Transmitter unable to monitoring capability valve flow for 8 VT-14180 81-88 I transmit flow information (powered by a different Division II SRV's I power supply)

b. Vibration indicating (Off . Switch unable to indicate I switch (high) I high flow condition I I I I I I

I I I

I

Facility: Susquehanna Steam Electric Station FAILURE NODES AND EFFECTS ANALYSIS Sheet 2 of 2 Docket: 50-387, 50-388 I 0160-004-671 Job No.

i'~

I Prepared by:

I ICommon paver Supply or Sensor: 1Y226 120 VAC CSID: 0160-004-001 Date: Nev. b Checked by: Date:

I Control System Affected: Reactor Mater Cleanu S stem RWCS CD: 0160-004-017 Approved by: Date: n I I Symptoms and Local Summary: Summaryr Component Name I Failure I Effects Including System Inherent Effect Upon Eftect Upon and Number Node Dependent Failures Compensating Provision Control System Plant Performance Il. Filterinstrumentation:

demineralizer tempera-I . Automatic RMCS system . RMCS system will still I ture I I shutdown Ipump and I operate normally

a. TE-lN007, TE-1N008 IOff Filter demineralizer in- . Alternate system high I valves) is disabled I I

strument loop is de- temperature available I I. Operator action is re-energized through TSH-1N020/ I I q uired to ensure s Y stem I TAH-14420 at the inlet toI protection I filter demineralizer I I

I I

I I

I I

I I

I

Electric Station PAILVRB HODBS AND EPPECTS ANALYSIS Sheet 1 of 3 Pacility: Susquehanna Steam Docket: 50-'387S 50-388 I

I Job No. U16U-UU4-6 Il Prepared by:

I ICommon Power Supply or Sensor: IY629 120 VAC CSID: 0160-004-001 Date:

Checked by:

i Zl ... Hev.~

Date'ate:

I

!cont!a! sYstem Affected: . Reantot manna! cont a~is t m JBa~cs CD; 0160-004-018 APProvef) bye Symptoms and Local Summary: Summary Component Name I

I Pailure I

I Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating Provision Control System Plant Performance I

I effect on the Loss ot reactor power Il. Rod Drive Control Cabinet/ . The ma5or RHCS is the loss of powerl control through the RHcs I

I P616: to operate the HCU'sg

a. Power Section IOff . Loss of power to branch Can disconnect power to therefore, no rod move- . Loss of rod movement I 5unction modules the system if the self test sub-system in the ment is possible capability during rod testing

. Loss of power to logic analyzer determines a . Command signals cannot power supply IRDCC elec.) malfunction has occurred be processed

. Loss of power to contact . The solenoid valves if f power supply (external in operation will fail I contacts to RDCC) shut) therefore, rod movement will stop at b..Activity Control )Off . Loss of input processing . affect of loss of power the nearest mechanical and isolation I in 1-a. is the overridingI latch position I factor

. Loss of rod motion signal I . All modes of operation processing . Loss of the activity are lost operator control is enveloped by control, scan, and self

. Loss of rod motion the loss of power test sequence timing signal

. There is also a loss of

c. Analyzer IOff Loss of system signal . Effect of loss of power electrical output from comparison device in 1-a. is the overridingI the accumulator pressure/I factor level limit switches,

. Loss of fault mapping scram valve position, circuitry Loss of the analyzer is scram test enveloped by the loss of

d. Branch Junction Nodule IOf f . Loss of po'wer NOTE: The loss of the processing to does not COHHAND'ord'ignal RHCS valves Effect of loss of power impact on the in 1-a. is the overridingI scram function

. Loss of power to trans- factor I porter I Loss of the transporter is enveloped by the loss I of power

Pacility: Susquehanna Steam Electric Station PAILURE MODES AND EPPECTS ANALYSIS Sheet la of 3 Docket: 50-387, 50-388 I

I Job No. 0160-OU4-671 I

Prepared by: (

(Common Power Supply or Sensor: 1Y629 120 VAC CSID: 0160-004-001 Date: Bev ~

I Checked by: Date; IControl System Affected: R a tor Rannal a*astrol R taa~llllCS CD: 0160-004-018 Approved by: Date:

I I Symptoms and Local Summary: Summary:

Component Name ) Pailure ( Effects Including System Inherent Effect Upon Effect Upon Dependent Pailures Compensating Provision Control System Plant Performance and Number Mode j

I

e. Transponder )Of f . Loss of command signal Directional control processing from the trans-I valves fail shut on loss (

ponder to the directional I of power I control valves (HCU) I I I I

. Loss of power to the I directional control valves(

(HCU)

Loss of accumulator pre-ssure and the level limit switch circuit

. Loss of the scram valve position switch circuit

. Loss of the scram test switch circuit

Electric Station FAILURE HODES AHD EPPECTS AHALYSIS Sheet 2 of 3 Pacility: Susquehanna Steam Docket: 50-387, 50-388 I Job Ho.

I Prepared by:

I ICommon Power I

Supply or Sensor:

Icontrol system Affected:

1Y629 120 VAC Recirculation Plow Control CSID:

CD:

0160-004-001 0160-004-018 Date:

Checked by:

Approved by: Date.~

ig

.+'lfif:::

Summary: Summary:

I I mittSymptoms and Local Effect Efrect Upon Component Hame I Pailure I Effects Including System Inherent Upon and Humber Hode Dependent Failures Compensating Provision Control System 1'lant Performance I

l. Reactor runback instrumenta- Reactor runback circuitryI . Plant performance is not I

tion: I is partially armed affected

a. Peedwater system train A:,IOff . Low flow signal trans- . Bus failure will not

1. PT-10604Al ted from the feedwate r system to react to the . Recirculation flow is

2. PY-10604Al system control of reactor runback signal without identical to the flow

3. PSL-10604A1 recirculation system run- the following inputs to prior to the loss of back circuitry to aux- auxiliary circuits A and I power iliary circuits A and 8 B:

Low flow input from I

I Peedwater system train B: IOff . Relay contacts in the feedwater system alarm I

1. PT-1060481 auxiliary circuitry logic I relay I

2. PY-1060481 are activated as part of I the runback signal pro- Circulating water pump I

3. PSL-10604B1 cessing Low HPSH input from Peedwater system train Cr IOff the feedwater system

1. PT-10604C1 I

2. PY-10604Cl

3. PSL-10604C1

Pacility: Susquehanna Steam Electric Station PAII URE HODBS AND BPPECTS ANALYSIS Sheet 3 of 3 Docket:

I I

I IComaon Power Supply I

or Sensor: IY629 120 VAC CSID 01'60-004-001 Job No Prepared by:

Dater Checked by:

~ L. c.

0160-004-671 Nev. O IControl System Affected: Pressure Re ulator and T G Control CD: 0160-004-018 Approved by:

Symptoms and Local Summary: Summary Component Name Pailure Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating Provision Plant Performance

1. Non-redundant power supplied I Inherent compensating . Loss of the AC bus vol- T/G trip is actuated devices I devices unnecessary for tage without PHG results I when pHG is not providingl I non-redundant power in: I redundant electricl I I supplied devices Loss of 24, -22, 30 VDCI power - otherwise no I I I trip will o<<<<ur I trip

a. pirst stage pressure feedback potentiometer IAs Is . Gain is not applied to the signal which operates the control valves at I

I The fail 'as is'ill if solenoid valves that closed by ETS only be Blectrical disabled system I I

I

~ Reactor scram will occur following T/G trip only I

I I

start-up loss of load occurs Both master trip pilot I if. reactor po~er is I simultaneously with loss I solenoid valves of the I greater than 30% I of power supply I Haster Trip Solenoid I I I become de-energized I

b. PA/PA Cransfer potentio- IAs Is . Hodulating control is not I meter I transferred from the stop I . The Haster Trip Solenoid I valves to the control valve will close and I valves results in: I

- Emergency Trip System I

c. Load reference motor lhs Is . Automatic modulation of actuates to trip T/G I I the load reference signal I can not be conducted I . At speeds sufficient to.

-The power/land unbalance I operate the permanent circuit cannot reset I magnet generator IPHG),

load signal automaticallyl redundant power for I essential devices is

d. Bypass valve jack motor I Of f . Disable manual position- supplied All 24, -22, 30 VDC ing of the bypass valves during start-up and cool- operated devices down

. Although several regu-

e. Pressure reference signal IOff Hanual control of pressurel laCing control features motor set-point is disabled- will be unavailable, a No variable set-point trip will not occur when I pressure for pressure the PHG is supplying I control unit's primary redundant power I pressure amplifier I I ht operating speeds, de- I

f. Past-acting solenoid IAs Is Intermediate valve fails vices without redundant valve - intermediate hs Is power supply either:

valve/SV-10160A2 - P2 hre not required at operating speeds I

Pacility: Susquehanna Steam Electric Station PAILURE HODES AHD EPPECTS AHALYSIS Sheet 3a of 3 Docket:

I I Job Ho. 0160-004-6yl prepared by:

Common PoMer Supply or Sensor: 1Y629 120 VAC CSID: 0160-004-001 Date: Rev' Checked by: Date:

Control System Affected: Pressure~Re ulator and~TG Control. 0160-004-018 Approved by: Date:

Symptoms and Local Summary: Summary:

Component Hame Pailure Effects Including System Inherent Pffect upon Effect Upon and Humber Hode Dependent Pailures Compensating Provision Control System Plant Performance

g. Past-acting solenoid lAs Is Intercept valve fails fail as is and have a valve - intercept valve/ As Is hydraulic backup systeml SV-10160A1 Bl I

- 'Preeze'n its last I

h. Solenoid valve - bypass IClosed . Bypass valves will fail configuration prior to I valve/SV-1014A E I closed - the bypass sys<< the failure of the AC I tern is disabled bus I

i. Solenoid test valve- (off Inability to energize stop valve/SV-10142 prevents valve position-ing by chest/shell Marmingl stop valve

j. Reset oil valve solenoid/ lOff Cannot be energized to SV-10123 I reset mechanical trip I valve I

k. Lockout valve solenoid/ lOff . Prevents lockout valve SV-10124 from bypassing mechanical trip valve, whereby the mechanical trip valve remains effective

1. Oil trip valve solenoid/ lOff . Valve closes and prevents I SV-10122 I acceptable hydraulic I pressure by closing mech-I anical trip valve I

m. Closing solenoid valve IAs Is Intercept valve fails intercept valve/ I As Is' SV-10160C1 - Pl I I I I

n. 'Closing solenoid - controllAs Is . The control valves mill valve/SV-10150A - D fail 'As Is'

o. Past-acting solenoid As Is . Stop valve fails 'As Is' valve - stop valve/

SV-10141A - D

pacility: Susquehanna Steam Electric Station PAILURE HODES AllD EPPECTS ANALYSIS Sheet 3b of Docket:

I U16U-004-671 I

Job Ho.

Prepared by:

I ICommon Power Supply or Sensor: 1Y629 120 VAC CSID: 0160>>U04-001 Date: Rev. 0 I

Checked by:

IControl System Affected: Sr ss ra Separator d~TG Co ntrol CD: 0160-004-018 Approved by: Date; I I Symptoms and Local Summary: Summary:

Component Hame I Pailure I Effects Including System Inherent Effect Upon Effect Upon and llumber Hode Dependent Pailures Compensating Provision Control System Plant Performance

p. Solenoid test valve- IOff Inability to energize stop valve g3/SV-10143 I prevents opening and I closing of valve when I Solenoid test valve- I controlled by positioning I stop valve l4/SV-10144 I unit in shell/chest warm-I ing stop valve Solenoid test valve-intermediate valve/

SV-10160A3 - P3 I

l2. Redundant power-supplied At operating speeds, re-devices:. dundant power is availa-ble from the permanent

a. Speed control IOff . Loss of speed signals magnet generator IPHG)

I

b. Pressure control IOff . Loss of pressure control Several devices are I essential at low speeds

c. Load control loff Loss of power-load match- without redundant power-I ing the emergency trip is I activated

d. Bypass control unit IOff . Loss of bypass system, to I direct steam to condenser.l Required system at low I speeds I I

e. Automatic pressure set- IOff Loss of pressure set-pointl point adjustment I signal to other systems I

f. Hain steam sensor/PT-10101IOff . Loss of main steam pres-I sure signals I

IOf f . Loss of intermediate I steam pressure signal I (power-level signal)

I

h. Electronic pressure trans-IOff loss of steam chest pres-mitter in steam chest/ I sure signal PT-10102

r Electric Station PAILURE NODES AND EPPECTS ANALYSIS Sheet 3c of 3 Pacility: Susquehanna Steam Docket:

I 0160-004-671 I

Job No, I

Prepared by:

1Y629 120 VAC CSID: 0160-004-001 Date: Hev.

ICommon Power Supply or Sensor: Checked by:

L Date: i7 2%1 I

IControl System Affected: PCeSSue R~ ~latae ad T G Cantral CD: 0160-004-018 Approved by: Date; m+/

I Symptoms and Local Summdryr Summary:

Component Name Pailure I Effects Including System Inherent Effect Upon Effect Upon and Number Node Dependent Pailures Compensating Provision Control System Plant Performance

i. Servo valve - control Off . Loss of control valve valve/XV-10148A - D positioning

$. Servo valve main stop Off Loss of stop valve 42 valve/XV-10141 positioning for chest/

chell warming

k. Servo valve - intercept I Off Loss of intercept valve valve/XV-10161A, C, E positioning Servo valve - bypass I valve/XV-10139A - E I

l. Auto load following unit Off . Loss of tracking signals I I

m. Prequency-voltage con- lOff verter I I

n. Line speed matcher lOff . Unnecessary at low speeds I I

I

o. Chest/shell warming (Off . Loss of chest/shell warm-circuit and logic ing circuit. Required in start-up mode (low speeds)

I

p. Current/voltage converter lOff Loss of converter I I

I

q. Rate-sensitive power-load lOff Loss of rate-sensitive i unbalance circuit I load control I

r. Valve positioning units lOff . Loss of flow control I

s. Haster trip bus lOff . Pails to energize I

t. Position transducer - con-lOff

. Loss of position feedback I trol valve/ZT-10150A D I signal to the position I unit in flow control Position transducer main lOf f stop valve/ZT-10141A - D

Pacility: 'Susquehanna Steam Electric Station PAILURE NODES AND EFEECTS ANALYSIS Sheet 3d . of 3 Docket:

I I Job No.

I Prepared by:

Supply or Sensor: IY629 120 VAC CSID: 0160-004-001 Date; I Nev (Common Power Checked by:

P.

'ate:~

(Control System Affected: Pressure Re ulator and ~T G Control CD: 0160-004-018 Approved by: nate:

I I Symptoms and Local Summary, SummaryJ Component Name Pa i lure Effects Including System Inherent Effect Upon Effect Upon and Number Hode I Dependent Pailures Compensating Provision Control System Plant Performance I

Position transducer - lOff intercept valves/ I ZT10160A1 - El I I

Position transducer - lOff intermediate stop valve/

ZT-10160A2 - P2

u. Haster trip solenoids Off . Doth solenoids de-ener-gized actuates Emergency Trip System

Pacility: Susquehanna Steam Electric Station PAILURE NODES AND EPPECTS ANALTSIS Sheet 1 of 2 Docket: 50-387, 50-388 I 0160-004-671 I

Job No.

I ICommon Power Supply or Sensor: PE-1N001A 8 C - Plow Elements CSID: 0160-004-001 Date: ~. s" Rev.

I Checked by:

IControl System Affected: Reactor Peedwater Control S stem CD: 0160-004-020 Approved by: Date:

I Symptoms and Local Summary: Summary:

Component Name I

I Pailure I Effects Including System Inherent Effect Upon Effect Upon and Number Node Dependent Pailures Compensating Provision Control System Plant Performance I

I l. Peedwater flow signal in-strumentation:

Plow element/FE-1NOOIA> 0, C~ I Pail Nighl. Nigh flow level signal . There are no inherent . Upon failing high, the There will be no atfect I I from 1 of 3 sensors will compensating provisions feedwater signals are on plant performance I be transmitted to level summed together and fed unless Lqvel 2 and 3 I controller into the control system 'trips ale reached I

I . The sensed floW rate willi I be too high ta maintain the desired level I I

, The feed pumps will re-ceive a speed runback control signal from the level controller

. The reactor water level signal will in turn counteract the flow sig-nal and attempt to stabilize the water levell I~ Level 2 and 3 trips may occur in dynamic transient Pail low I Low flow level signal . There are no inherent . Upon failing low, the . There will be no affect I from 1 of 3 sensors will system compensating control signal speeds up I on plant performance be transmitted to level provisions the reactor feed pumps tol unless Level 8 trip is controller counter lower feedwater reached flow rates.

. The reactor level will rise and in turn attempt to counteract low flow signal Level 8 trip may occur in dynamic transient

~ Assumes failure of one element only, PNEA is the same for any one element failure.

Pacility: Susquehanna Steam Electric Station PAILURE MODES AND BPPECTS ANALYSIS Shoot 2 of 2 Docket: 50-387, 50-388 I Job Ho. 0160-004-671 I Prepared by:

I ICommon Power Supply or Sensor: PE-1NOOlh 8 C - Flou Elements CSID: 0160-004-001 Date:

~ kev. D

~. r-I Checked by: p~aJ Date:

Recirculation Plow Control CD: 0160-004-020 Approved by: Date t W P/

(Control System Affected: ~

I I I Symptoms and Local I Summaryt Summary:

I I Component Name Pailure I Effects Including System Inherent I Effect Upon Effect Upon and Number Mode Dopendent Pailures Compensating Provision Control System Plant Performance

+

1. Reactor Runback Signal Instrumentation-Feedwater System: Loss of ability to moni- Plant performance is

a. Plov element, IPail Night. Ho low flow runback . There are no inherent .

PE-1HOOlh, 8 C I signal associated with compensating provisions tor actual low flow con- not affected I instrument failure ditions from the failed I instruments I

IPails Loul. Low flov signal trans- Recirculation control . Reactor runback circuitryl Plant pertormance is mitted from the feedvater system vill not react is partially armed not affected.

system control of reactor to the runback signal recirculation system run- without the following . Recirculation flow is back circuitry to auxil- inputs to the auxiliary identical to the flow iary circuits A and 8 circuits: prior to instrument's iow flou input from failure

. Relay contacts in the feedwater system auxiliary circuitry logic I blare/Relay are activated as part of tho reactor runback signall Circulating water pump processing I trip input

- Low HPSN input from feoduater system Assumes failure of one element only, PMEA is the same for any one failure.

Paciltiy: Susquehanna Steam Electric Station PAILURB NODES AHD EPPECTS ANALYSIS Sheet 1 of 1 Docket: 50-387, 50-388 I

I I

ICommon Power I

Supply or Sensor:

Cascading Power Supply Effect 1Y218 and 1Y219 120 VAC CSID: 0160-004-001 0160-004-019 Job No.

Prepared by:

Date:

Checked by:

Approved by:

~ 0160-004-671 Hev, Date:

O IControl System Affected: See Note CD:

I Symptoms and Local Summary Summary:

Component Name I

I Pailure I Effects Including System Inherent Effect Upon Effect Upon and Number Hode Dependent Pailures Compensating Provision Control System Plant Performance Note: Th e PHEAs for these power supplies are ad dressed individually under 1 Y218 and 1Y219, respectively.

I