ML20080T739

Proposed TS Section 3.3, Instrumentation

ML20080T739
Person / Time
Site:	Peach Bottom
Issue date:	03/03/1995
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20080T725	List: ML20080T722 ML20080T739
References
NUDOCS 9503140091
Download: ML20080T739 (12)

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ENCLOSURE 2 ATTACHMENT B PECO ENERGY RESPONSE TO NRC OUESTION A-6, ITS UNIT DIFFERENCES 1

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'LCO' 3.3.8.1 The Unitt 2 LOP-instrumentation for each function in .j h Table 3.' .8.1-1 shall be OPERABLE. :j 3

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g. p k :t 3 The Uni OP instrumentation for Functions 11, 2, 3, Land 5' ,

in'Uai able 3.3.8.1-1 shall be OPERABLE. ' 1 m ,

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APPLICABILITY: When the associated diesel generatorLis required to be OPERABLE by LCO 3.8.1, "AC Sources-Operating," or '

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LCO 3.8.2, "AC Sources-Shutdown."

l o.1 ' ACTIONS. "

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Separate Condition entry is allowed for each 1

_____________________________________________' channel.

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... 't CONDITION ' REQUIRED ACTION  ! COMPLETION TIME j y

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A. 'One or more channels A.1 --------N T --------

I inoperable. For Unit 3 hannels, i the Cond on to be '

entered for this LCO l is ref  !

TablM.3.8(.T-1. Unit (3grencedin.

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Enter the Condition' Immediately I referenced in Table 3.3.8.1-1 for i the channel.'- '

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F Actions may be delayed for up-to 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> provided: (a) for Function 1, the associated Function maintains initiation capability for three DGs; and.

-(b) for Functions 2,.3, 4, and 5, the associated Function maintains undervoltage transfer capability for three 4 kV emergency buses.

SURVEILLANCE FREQUENCY SR 3.3.8.1.1 Perform CHANNEL FUNCTIONAL TEST. 31 days '

SR 3.3.8.1.2 Perform CHANNEL CALIBRATION. 18 months- t SR 3.3.8.1.3 Perform CHANNEL FUNCTIONAL TEST. 24 months' ,

SR 3.3.8.1.4 Perform LOGIC SYSTEM FUNCTIONAL' TEST. 24 months l 0

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SR 3.3.8.1.5 For required Uni 3 0 ns mentation In accordance  ;

Functions, the SRs of Uni 3 with applicable  !

Specification 3.3.8.1 are icable. SRs -}

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i PBAPS UNIT 2 3.3-63 Amendment

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BASES s APPLICABLE' 7.

SAFETY ANALYSES, Scram Discharae ' Volume Water level-Hiah (continued)

LCO, and SDV water level is measured byffour float' type 1D

-APPLICABILITY- witches which_ provide 34ur level cinnaltf The outputs of these aevices_are arranged so that one witc rovides. input:

to one RPS logic channel. The level measuremen instrumentation satisfies the recommendations of ' " " . .O u~

Reference 8.

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The Allowable Value is chosen low enough to ensure that

.{, ,, d; w n u tweds, there is sufficient volume .in the SDV to accommodate the  !

water from a full scram.

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b bo Li hP' Four high water level inputs to the RPS fourhitches sAW aJ bo .C, are required to be OPERABLE, with two switche in e u tr p system, to ensure that no single instr (ument ailure will b

f"y g'" preclude a scram from this Function on a valid signal. This.

n. Md " 4' Function is required in N0 DES I and 2, and in MODE 5 with:

klmt si)~h.- any control rod withdrawn from a core cell containing. one or.

more fuel assemblies, since these are the' MODES and other.

4,,. g4 3 specified conditions when control. rods are withdrawn. At all other times, this Function may be bypassed. .

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8. Turbine Stoo Valve-Qomg

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Closure of the TSVs results in the loss of a heat sink that produces reactor pressure, neutron flux, and heat fldx transients that must be limited. Therefore, a reactor scram is initiated at the start of TSV closure'in anticipation of -

the transients that would result from the closure'of these valves. The Turbine Stop Valve-Closure Function .is the' primary scram signal for the turbine trip event analyzed in Reference 7 and the feedwater controller failure event. For these events, the reactor scram reduces the amount of energy required to be absorbed and ensures that the MCPR SL is'not exceeded. '

Turbine Stop Valve-Closure signals are initiated from four

• position switches; one located on each of the four TSVs.

Each switch provides two input signals; one to RPS trip  ;

system A and the other, to RPS trip system B. Thus, each RPS trip system receives an input from four Turbine Stop 3; Valve-Closure channels. The logic for the Turbine Stop 'I (continued)

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PBAPS UNIT 2 B 3.3-17 Revision 0 I

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• s- Remote-Shutdown System B 3.3.3.2 Table B 3.3.1.2-1 (page 1 of 3)

(~ Remote Shutdown System Instrumentation FUNCTION REQUIRED NUMBER OF CHANNELS Instrument Parameter 1.- Reactor Pressure 2

2. Reactor Level (Wide Range) 2

3. Torus Temperature 2 y

4. Torus Level 1

5. Condensate Storage Tank Level 1

6. RCIC Flow 1

7. RCIC Turbine Speed 1

8. RCIC Pump Suction Pressure 1

9. RCIC Pump Discharge Pressure 1

10. RCIC Turbine Supply Pressure 1

11. RCIC Turbine Exhaust Pressure 1

[52. "A" ESW Discharge Pressure 1 "B" ESW Discharge Pressure

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14. Drywell Pressure 1 Transfer / Control Parameter

15. RCIC Pump Flow 1

16. RCIC Drain Isolation to Radwaste 1

17. RCIC Steam Pot Drain Steam Trap Bypass 1

18. RCIC Drain Isolation to Main Condenser 1  ;

1 (continued) ;

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PBAPS UNIT 2 B 3.3-79 Revision 0 )

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B 3.3.3.2 h Table B~ 3.3.1.2-1 (page 2 of 3)

Remote Shutdown System Instrumentation o

t FUNCTION REQUIRED NUMBER OF CHANNELS

. Transfer / Control Parameter (continued)

19. RCIC Exhaust Line Drain Isolation 2 (1/ valve)

20. RCIC Steam Isolation 2 (1/ valve)

21. RCIC Suction from Condensate Storage Tank 1

22. .RCIC Pump Discharge 2

. (1/ valve)

23. RCIC Minimum Flow 1-

24. RCIC Pump Discharge to Full Flow Test Line 1

25. RCIC Suction from Torus 2 (1/ valve).

26. RCIC Steam Supply 1

27. RCIC Lu,be Oil Cooler Valve 1

28. RCIC Trip Throttle Valve Operator Position 1

29. RCIC. Trip Throttle Valve Position 1

30. RCIC Vacuum Breaker 1

31. RCIC Condensate Pump 1

32. RCIC. Vacuum Pump 1

33. Safety / Relief Valves (S/RVs) 3 (1/ valve)

F~34. '"A" ESW Pump [ g. gm "B" ESW Pump 1j k " 3 (35. >

(continued)

PBAPS UNIT 2 B 3.3-80 Revision 0

1.. Remote Shutdown System B 3.3.3.2 Table B 3.3.1.2-1 (page 3 of 3)

Remote Shutdown System Instrumentation FUNCTION REQUIRED NUMBER OF CHANNELS Transfer / Control Parameter (continued)

36. "A" CRD Pump 1

37. "B" CRD Pump 1

38. RHR Shutdown Cooling Isolation 2 (1/ valve) 39 Auto Isolation Reset 2 (1/ division)

40. Instrument Transfer 5 (1/ transfer switch)

41. 1 22 Breaker E 223 \ 1

42. E322 Breaker G 325 1 I

43. E242 ' Breaker E 2M 5 1

44. E342 Breaker E 343 1

45. E224 Breaker E Z34 f, 6:t 3 1 /

46. E212 Breaker E 2.i3 1

47. E312 Breaker E 'S ' 3 1

48. E232 Breaker 'E E $3 1

49. Breaker E '3 3 3 1 PBAPS UNIT 2 B 3.3-81 Revision 0

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BACKGROUND

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Successful' operation ~of the' required safety functions of?the' ,

'i J Emergency Core Cooling Systems (ECCS)31sidependent upon the ' ,

availability of' adequate power _ sources for-energizing.the- 3 various components-such as' pump motorsn motor operated; valves, and the associated control components. (The' LOP:

instrumentation monitors the 4 kV emergency buse's;and power.  ;

to the buses._ Offsite. power is the preferred source of: ,

, power'for the 4 kV emergency buses. If the.monitorsl determine:that insufficient power lis available,' the buses' a

n are' disconnected from the'offsite. power.-sources and?  ;

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connected to th onsite diesel generator.(DG)1 power' sources. . ai:

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. Each Unit k emergency. bus.hasitsownLindependent)LOPf .-l instrumenta ion and. associated trip. logic. The voltage:for? 11 each bus is monitored at five' levels, whichican be'- '. ci

. considered ~as two different undervoltage Functions: one r

. level of loss of voltageand four levelsfof degraded: 1 voltage. Each Function causes'--various bus (transfers =and ,

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disconnects. "The degraded-voltage Functions are monitored y by two undervoltage relays (one per :,ource);per Function andi n the loss of voltage Function is. monitored.by.'one .

d undervoltage relay for each emergency. bus'. . The' degraded , m voltage outputs and the' loss;of voltage outputs arejarranged .{"

in a one-outsof-one' logic configuration. . The channels ^

include-electronic equipment (e.g., internal; relay contacts,:  !

coils, solid state logic, .etc.) that compares measured! input.l l sign'als with pre-established setpoints. When the setpoint i is exceeded for a degraded voltage channel', the' preferred J offsite source' breaker to the 4 kV emergency bus-is tripped y and autotransfer to the alternate offsite Lsourcelis  :

initiated. If the alternate source does ..not ' provide- _;

adequate power to the bus as sensed by.the undervoltage ':

relay, a diesel generator-start nal -is ' initiated. j

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A description of the U 3- OP. nstrumentation is provided. l

. in the Bases for Unit 3 C 3.3.8.1. j (continued) 1 g 4g3 --

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PBAPS UNIT 2 B 3.3-185 Revision 0

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TAPPLICABLE- parameter exceeds the setpoint, the associated device 1(e.g.,L

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SAFETY' ANALYSES, internal- relay contact) changes state. The Allowablei K

'LCO,9and - Values 'are derived from the limitingivalues of the processi

. l APPLICABILITY parameters 'obtained from the1 safety analysis;and corrected '

.(continued)- for calibration, process,' and some: of the . instrument' errors. . >

e The, trip setpoints are then. determined accounting for the' f^ remaining instrument errors (e.g'.. drift). The trip .-

Q - setpoints: derived in this manner provide: adequate protection!

because instrumentation. uncertainties, process: effects, .

calibration tolerances,. and instrument drift are accounted for' 3 .f,[(Zi4 31 fll ?The specific Applicable Safety' Ana s, ,1and ,

Applicability discussions for. Uni 2- OP; instrumentation are.

listed below on.a Function- by Func n is. f,6.431 t ,m & WH

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In~ addition, sin e, equipment req d by Uni 2-~ s -

powered from Unit 3 ources,.the Unit OP; instrumentation?

fm sup)orting:the required ~ sources must .be OPERABLE. .The-h MBILITY. requirements. tor;the . Unit OP instrumentationi V2s OPE is the same_as described in this sect n,'except Function 44 .

C,L.:ts (4 kV Emergency Bus Undervoltage, Degraded Voltage;LOCA) is.

, not required to ERABLE, since t siFunction is: related to a LOCA'on U 3 nly. The Unit nstrumentation is listed in Uni 3 bl e 3.3.8.1-1. 7 [.p, Mn

@ 1. 4 kV 'Emeraency Bus Undervoltaae- (Loss of Voltaae). ,

When both offsite sources'are lost, a loss of ' voltage q condition on a 4 kV emergency. bus indicates that'the R respective emergency. bus is unable to supply sufficient power for proper operation of the applicable equipment.

Therefore, . the: power supply to the bus'is- transferred' from-offsite power to DG power.: This' ensures that-adequate power 1 will be available to 'the-required equipment.

The single channel of 4 kV Emergency Bus Undervol.tage (Loss of Voltage) Function per associated emergency bus isionlyn required to be OPERABLE when the associated DG isirequired-

. to be OPERABLE. This ensures no single-instrument' failure

"_ - can preclude.the start of three of four.DGs. (One channel-inputs to 'each of the four DGs.) Refer to LCO 3.8.1, "AC Sources-Operating," . and 3.8.2, . "AC Sources-Shutdowri," ~ for-Applicability Bases for'the DGs.

(continueQ q

PBAPS UNIT 2 B 3.3-187 Revision 0 l

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, ' LOP Instrumentation-B 3.3.8.1- ss (BASES 4 L

L, -APPLICABLE .

2. 3. . - 4' . 5. : 4 kV'Emeraency Bus Undervoltaae- (Dearaded.

U g SAFETY; ANALYSES, : Voltaae)- (continued)- .;

L, ' LCO,' ' and ..

i kJ  ! APPLICABILITY ~ Two channels (one channel per source) df-4L kV Emergency Busi o Undervoltage (Degraded Voltage) per Fun'etion:(Functions 2,-  !

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' 3,. 4, and 5) per associated bus arefonly required to be-

, OPERABLE when the associated DG is: required to be OPERABLE.- -!

L' This ensures no single instrument. failure can preclude Lthe - l 7 start of three of four DGs (each logic: inputs to Leach of the.' a p' , fourDGs).- Refer to LCO 3.8.1 and LCO 3.8.2: for- ,

Applicability Bases for the DGs. '

y, ACTIONS A Note has been provided (Note 1) to modify the ACTIONS'  :!

related to LOP instrumentation channels. Section 1.3.-

s Completion Times, specifies that once a Condition has-been-entered, subsequent divisions, subsystems, components, ors

. variables expressed in the Condition,- discovered to.be ,

N inoperable. or not within limits, will 'not result in separate H entry into the Condition. Section_1.3 'also specifies that Required Actions of the Condition continue ~to apply for each -

additional failure, with Completion _ Times based:on initial' entry into the Condition. However, the: Required Actions'.for inoperable- LOP instrumentation. channels. provide appropriate com)ensatory measures for separate inoperable channels. As-

• suci, a Note has been provided that allows separate

. Condition entry for each inoperable LOP . instrumentation channel. j Ad 7 g g3 2 6,, L+ 3 Required Action A.1 directs ntry into the appro late Condition referenced in Tabl 3.3.8.1-1. -The. apl licable Condition referenced in the able is Function de >endent.

Each time a channel is discovered inoperable, Co ldition'A is.

entered for that channel and provides for transfer to the.

appropriate subsequent'Cond' tion. :A Note has be dded to ensure the proper Condition entered if:a Uni hannel is i rable. When a Uni 3~ hannel is inopera , the 4.N

. n ble provides the a ropriate condition to be, ente . The condition entered, however, will b 'e Uni

& W Condition in this LCO. For exampi if the Uni 3 able references Conditio then Unit 2 ondition B 1'be ente if the Uni hannel is perable and re uired by Uni 2 C0 3.3.8.1.

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b M3 (continued) 1 PBAPS UNIT.2 B 3.3-189 Revision 0 i

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io . ACTIONS: :L.1"-(continued)

- Required ' Action C.1 is_- applicable to the Loss of Voltage, .

'y U the Degraded Voltage Low 5ettingE and the . Degraded.Vo.itage.

LOCA functions (Functions 1,; 2, and 4, respectively). .. With;

'one or more' channels' of a~ Function inoperable, the Function: ,'

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" . is not capable of performing the intended function.- ...

' Therefore, only I hour is allowed to restore the-inoperableL channel to OPERABLE status. If- the' inoperable channel t .

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. . cannot be' restored to OPERABLEr status- within' the allowablef out of service time,-- the channel lmust be placed in the R tripped condition per- Required' Action C.I. - Placing ~ the-F inoperable channel in trip would conservatively

compensate' p" for the inoperability, restore design. trip capability to'the ~

LOP instrumentation, and allow. operation to continue. .

Alternately, if it is not desired to place the channel in trip (e.g., _ as:in the case where placing the channel in trip 1 would result in' a.DG initiation), Condition D'must be' entered and its Required Action taken.

The Completion Time is. intended to allow the operator; time" to evaluate and, repair any' discovered'inoperabilities. - The-I hour Completion Time is acceptable because it minimizes.

r risk while allowing time for restoration or. tripping _ of -

channels.

DJ r n If any Required Action.and associated Completion Time _ are not met, the associated Function is:not capable of .

performing the. intended function. Therefore, the associated .

DG(s) is declared inoperable immediately. This. requires' entry into applicable Conditions and Required Actions of

1. LCO 3.8.1 and LCO 3.8.2, which. provide. appropriate' actions for the inoperable'. DG(s).

SURVEILLANCE As n d at the beginning of the SRs,~the SRs for each-REQUIREMENTS Un 2 OP instrumentation Function are located in the SRs colu . of T a 3.3.8.1-1. : SR 3.3.8.1.5 is applicable only-ni to the Unit 3 .0P instrumentation.

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f, GM The Surveillanc are also modified by a Note to. indicate that een a channel is placed in an' inoperable status solely-for pernrmance of required Surveillances,' entry into.

associated Conditions and Required Actions may be delayed (continuedi PBAPS UNIT 2 B 3.3-192 Revision 0

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F 0 91 LOP Inn,trumentation B 3.3.8.1

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SURVEILLANCE SR 3.3.8.1.4-

. REQUIREMENTS i (continued) The LOGIC SYSTEM FUNCTIONAL TEST demonstrates the.  :

OPERABILITY of the required actuation logic for a specific

p. - channel. The system functional testing performed in .

LCO 3.8.1 and.LC0 3.8.2 overlaps this Surveillance to .

provide complete testing of the assumed safety functions.

The 24 month Frequency is based on the need to perform this- l Surveillance under the. conditions that apply during a plant  :

5 outage and the potential for an unplanned transient if the  :

" Surveillance were performed with the reactor at power.

SR 3.3.8.1.5 g, g;3 3 F

With the excepti.-o of this Surveillance, al' other'-  :

Surveillances of this Specification (SR 3. .1.1 through i SR 3.3.8.1.4) are applied only-to the Uni OP instrumentation. This Surveillance is pro ed to direc that the. appropriate Surve111ances for the re, red Uni 3

, LOP instrumentation are governed by the. Unit 3 chn cal i Specifications. Performance of in applicab e ni 3 i Surveillances will s tisfy Uni 3 requirements, s as satisfying this Un 'l urveill nce Requirement, p g, y 3

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. The Frequency r uired by the plicable Unit 3 R also r governs performance of that SR for Uni 2. j 4

REFERENCES 1. UFSAR, Chapter 14. 4< WA B P

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i PBAPS UNIT 2 B 3.3-194 Revision 0

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