ML20080T739

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Proposed TS Section 3.3, Instrumentation
ML20080T739
Person / Time
Site: Peach Bottom  Constellation icon.png
Issue date: 03/03/1995
From:
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20080T725 List:
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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'3.3/ INSTRUMENTATION; D ^ ;4l L 3.3.8.l! Loss of Power (LOP) Instrumentation-j l:.

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'LCO' 3.3.8.1 The Unitt 2 LOP-instrumentation for each function in

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Table 3.'.8.1-1 shall be OPERABLE.

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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. '

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'h APPLICABILITY:

When the associated diesel generatorLis required to be j

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OPERABLE by LCO 3.8.1, "AC Sources-Operating," or '

n LCO 3.8.2, "AC Sources-Shutdown."

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' ACTIONS.

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NOTE-------------------------------------

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Separate Condition entry is allowed for each

_____________________________________________' channel.

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't CONDITION

' REQUIRED ACTION

! COMPLETION TIME j

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A. 'One or more channels A.1

N T inoperable.

For Unit 3 hannels, i

the Cond on to be entered for this LCO l

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

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

the channel.'-

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mssul water from a full scram.

gq 4. u_a 3 b bo Li hP' Four high water level inputs to the RPS fourhitches sAW aJ bo are required to be OPERABLE, with two switche in e u tr p

.C, system, to ensure that no single instr (ument b

f"y ailure will Md " 4' g'"

preclude a scram from this Function on a valid signal.

This.

Function is required in N0 DES I and 2, and in MODE 5 with:

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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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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) s.

PBAPS UNIT 2 B 3.3-17 Revision 0 I

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

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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

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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

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"A" ESW Discharge Pressure 1

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"B" ESW Discharge Pressure 1

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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) i i

PBAPS UNIT 2 B 3.3-79 Revision 0

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": ' 3 Remoto Shutd*,wn Syst".m 7

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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

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"B" ESW Pump 1j k " 3 (continued)

PBAPS UNIT 2 B 3.3-80 Revision 0

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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

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46.

E212 Breaker E 2.i3 1

47.

E312 Breaker E

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48.

E232 Breaker

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49.

Breaker E '3 3 3 1

PBAPS UNIT 2 B 3.3-81 Revision 0

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

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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

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

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

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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'- '.

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. considered ~as two different undervoltage Functions:

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. level of loss of voltageand four levelsfof degraded:

1 voltage.

Each Function causes'--various bus (transfers =and i

L 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

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in a one-outs f-one' logic configuration.. The channels ^

o 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.

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

l in the Bases for Unit 3 C 3.3.8.1.

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U PBAPS UNIT 2 B 3.3-185 Revision 0

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LOPTInstrumentation1 B 3.3.8.1" g

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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' remaining instrument errors (e.g'.. drift). The trip.-

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

Q because instrumentation. uncertainties, process: effects,.

calibration tolerances,. and instrument drift are accounted for' 3

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?The specific Applicable Safety' Ana s,

,1and Applicability discussions for. Uni 2-OP; instrumentation are.

listed below on.a Function-by Func n

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

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

fm sup)orting:the required ~ sources must

.be OPERABLE..The-h V2s OPE MBILITY. requirements. tor;the. Unit OP instrumentationi 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.

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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.

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PBAPS UNIT 2 B 3.3-187 Revision 0

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-APPLICABLE 2.

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

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SAFETY; ANALYSES, : Voltaae)- (continued)-

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! APPLICABILITY

~ Two channels (one channel per source) df-4L kV Emergency Busi o

Undervoltage (Degraded Voltage) per Fun'etion:(Functions 2,-

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

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

,L' This ensures no single instrument. failure can preclude Lthe -

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start of three of four DGs (each logic: inputs to Leach of the.'

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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.

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6,, L+ 3 Ad 7 g g3 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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L.1"-(continued) io ACTIONS:

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

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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 T

channel to OPERABLE status.

If-the' inoperable channel t.

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

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

r channels.

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If any Required Action.and associated Completion Time _ are n

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 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.

t. (,, V 3 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 F

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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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governs performance of that SR for Uni 2.

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REFERENCES 1.

UFSAR, Chapter 14.

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i PBAPS UNIT 2 B 3.3-194 Revision 0

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