Text

Proposed Tech Specs,Modifying Actions Associated W/Ts Table 3.3-1 for Reactor Protective Instrumentation & Table 3.3-3 for Esfa Sys Instrumentation
	ML20151J337
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/28/1997
From:	; ENTERGY OPERATIONS, INC.
To:	;
Shared Package
ML20151J335	List: 2CAN079702, Application for Amend to License NPF-6,modifying Actions Associated W/Ts Table 3.3-1 for Reactor Protective Instrumentation & Table 3.3-3 for Esfa Sys Instrumentation; ML20151J337;
References
	NUDOCS 9708050136
	Download: ML20151J337 (14)
	v • d • e

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I PROPOSED TE(HNICAL SPECIFICATION CHANGES t

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9709050136 970728

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l TABLE 3.3-1 (Continued)

ACTION STATEMENTS ACTION 2 - With the number of channels OPERABLE one less than the Total Number of Channels, operation in the applicable MODES may continue provided the l inoperable channel is placed in the bypaesed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . If the inoperable channel is bypassed for greater than 48 l hours, the desirability of naintaining this channel in the bypassed l l condition shall be reviewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations. The channel shall be

( returned to OPERABLE status prior to startup following the next COLD l SHUTDOWN.

l l

With a channel process measurement circuit that affects multiple

functional units inoperable or in test, bypass or trip all associated l functional units as listed below.

Process Measurement Circuit Functional Unit Bypassed

1. Linear Power Linear Power Level - High (Subchannel or Linear) Local Power Density - High 3 DNBR - Low l Log Power Level - High*

2. Pressurizer Pressure - NR Pressurizer Pressure - High Local Power Density -High

! DNBR - Low l

l 3. Containment Pressure - NR Containment Pressure - High (RPS) l ContairJment Pressure - High (ESEAS)

( Containment Pressure - High-High I l (ES EAS)

4. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

5. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low ;

Steam Generator 1 ai' (EEAS 1) l Steam Generator 2 AP (EEAS 2) )

6. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High l Steam Generator 1 AP (EEAS 1) ;

i

7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High l Stcam Generator 2 AP (EEAS 2)

{

8. Core Protection Calculator Local Power Density - High DNBR - Low

!

Only for failure common to both linear power and log power. l' f 1 1

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. ARKANSAS - UNIT 2 3/4 3-5 Amendment No. M,MG,M4, i

_ _ -. ._. ~. .. _ . _ _ _- m m__ .

, TABLE 3.3-1 (Continued)

ACTION STATEMENTS ACTION 3 - With the number o- 'hannels OPERABLE one less than the Minimum Channels OPERABLE requirement, operation in the applicable MODES may continue l l

provided the following conditiens are satisfied:

a. Verify that one of the inoperable channels has been bypassed and place the other inoperable channel in the tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and

b. All functional units affected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as listed below:

i Process Measurement Circuit Functional Unit Bypassed / Tripped l

1. Linear Power Linear Power Level - High (Subchannel or Linear) Local Power Dencity - High i DNBR - Low Log Power Level - h' gh**

! 2. Pressurizer Pressure - NR Pressurizer Pressure - High I

Local Power Density -High DNBR - Low

3. Containment Pressure - NR Containment Pressure - High (RPS)

Containment Pressure - High (ESEAS)

Containment Pressure - High-High l (ESEAS)

4. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low

! Steam Generator 1 AP (EEAS 1) I Steam Generator 2 AP (EEAS 2) j

5. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2) l 6. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EEAS 1)

7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Genorator 2 Level - High Steam Gene rator 2 AP (EEAS 2) 1

( 8. Core Protection Calculator Local Power Density - High

DNBR - Low i

Operation in the applicable MODES may continue until the performance of the next required CHANNEL EUNCTIONAL TEST. Subsequent operation in the applicable MODES may continue if one channel is restored to OPERABLE status and the provisions of ACTION 2 are satisfied.

- Only for failure or activities common to both linear power and log power.

AFJmNSAS - UFi? 2 3/4 3-Sa Amendment No. M9,

TABLE 3.3-3 (Continued)

TABLE NOTATION (a) Trip function may be bypassed in this MODE when pressurizer pressure is below 400 psia; bypass shall be automatically removed when pressurizer pressure is 2 500 psia.

(b) An SIAS signal is first necessary to enable CSAS logic.

(c) Remote manual not provided for RAS. These are local manuals at each ESF auxiliary relay cabinet.

ACTION STATEMENTS ACTION 9 - With the number of OPERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

ACTION 10 - With the number of channels OPERABLE one less than the 'rotal Number of Channels, operation in the applicable MODES may continue l provided the inoperable channel is placed in the bypassed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . If the inoperable channel is bypassed for greater than 48 hotrs, the desirability of maintaining this channel in the bypassed condition shall be reviewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations.

The channel shall be returned to OPERABLE status prior to startup following the next COLD SHUTDOWN.

l If an inoperable Steam Generator AP or RWT Level - Low channel is placed in the tripped condition, remove the inoperable channel from the tripped condition within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . .

l With a channel process measurement circuit that affects multiple functional units inoperable or in test, bypass or trip all ;

associated functional units as listed below.

Process Measurement Circuit Functional Unit Bypassed

1. Containment Pressure - NR Containment Pressure - High (RPS)

Containment Pressure - High (ESEAS)

Containment Pressure - High-High (ESEAS)

2. Steam Generator 1 Pressure Steam Generator 1 Pressure - Lew l Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

4. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High

, Steam Generator 1 AP (EEAS 1) s 5. Steam Generator 2 Level Steam Generatcr 2 Level - Low Steam Generator 2 Level - High Steam Generatot 2 AP (EEAS 2)

ARKANSAS - UNIT 2 3/4 3-14 Amendment No. M4,M9,M4,

TABLE 3.3-3 (Continuad) t ,

TABLE NOTATION ACTION 11'- With the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, operation in the applicable MODES l may continue provided the following conditions are satisfied:

l

a. Verify that one of the inoperable channels has been bypassed and place the other inoperable channel in the tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and

b. All functional units affected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as listed belows i

Process Measurement Circuit Functional Unit Bypassed / Tripped I

)

l 1. Containment Pressure - NR Containment Pressure - High (RPS) l l Containment Pressure - High (ESEAS) l Containment Pressure - High-High l (ESFAS) i l

j 2. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low l Steam Generator 1 AP (EFAS 1)

Steam Generator 2 AP (EEAS 2) l 4

I 3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low I

! Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2) -j I

l 4. Steam Generator 1 Level Steam Generator 1 Level - Low l Steam Generator 1 Level - High

! Steam Generator 1 AP (EEAS 1) '

l

5. Steam Generator 2 Level Steam Generator 2 Level - Low

! Steam Generator 2 Level - High i

Steam Generator 2 AP (EEAS 2) i l If an inoperable Steam Generator AP or RWT Level - Low channel is placed in the tripped condition, remove the inoperable channel from the tripped condition within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

l l Operation in the applicable MODES may continue until the performance

i. of the next required CHANNEL FUNCTIONAL TEST. Subsequent operation l in the applicable MODES may continue if one channel is restored to OPERABLE status and the provisions of ACTION 10 are satisfied.

ACTION 12 - With the number of OPERABLE channels one less than the Minimum Channels OPERABLE, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

l. ACTION 13 - With the number of OPERABLE channels one less than the Total

! Number of Channels, restore the inoperable channel to OPERABLE

status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within 4 the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30

. hours; however, one channel may be bypassed for up to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months i for surveillance testing provided the other channel is OPERABLE.

i j ARKANSAS - UNIT 2 3/4 3-15 Amendment No. 144,

.' 3/4.3 INSTREMENTATION BASES Plant Protective System (PPS) logic is designed for operation as a 2-out-of-3 logic, although normally it is operated in a 2-out-of-4 mode.

The RPS Logic consists of everything downstream of the bistable relays and upstream of the Reactor Trip Circuit Breakers. The RPS Logic is divided into two parts, Matrix Logic, and Initiation Logic.

Failures of individual bistables and their relays are considered measurement channel failures.

The ESFAS Logic consists of everything downstream of the bistable relays and upstream of the subgroup relays. The ESEAS Logic is divided into three parts, Matrix Logic, Initiation Logic, and Actuation Logic. Failures of individual bistables and their relays are considered measurement channel failures.

Matrix Logic refers to the matrix power supplies, trip channel bypass l contacts, and inte rconnecting matrix wiring between bistable relay cards, up to, but not including the natrix relays. Matrix contacts on the bistable relay cards are excluded from the Matrix Logic definition since they are addressrd as part of the measurement channel.

l Initiation Logic consists of the trip path power source, matrix l relays and their associated con acts, all interconnecting wiring, and the initiation relays (including contacts).

ESEAS Actuation Logic consists of all circuitry housed within the Auxiliary Relay Cabinets (ARCS) used to housc the ESF Function; excluding the subgroup relays, and interconnecting wiring to the initiation relay contacts mounted in the ePS cabinet.

For the purposes of this LCO, de-energization of up to three matrix power supplies due to a single failure, such as loss of a vital instrument bus, is to be treated as a single matrix channel failure, providing the affected matrix relays de-energize as designed to produce a half-trip. Although each of the six matrices within an ESFAS Function (e.g., SIAS, MSIS, CSAS, etc.) uses separate power l supplies, the matrices for the different ESEAS Functions share power supplies. Thus, failure of a matrix power supply may force entry into the condition specified for each of the associated ESEAS Functional Units.

Table 3.3-3 Action 10 allows for continued operation in the applicable MODES with the number of channels OPERABLE one less than the Total Number of Channels provided the inoperable channel is placed in the bypassed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

If an inoperable Steam Generator AP or Refueling Water Tank (RWT) Level - Low channel is placed in the tripped condition, it must be removed from the tripped condition within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or the plant must be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . This condition is limited to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because of the single failure vulnerability that exists with one of the Steam Generator AP or RWT Level - Low channels in the trip condition.

ARKANSAS - UNIT 2 B 3/4 3-le Amendment No. -149,

i 3 / 4'. 3 INSTRUMENTATION l

BASES Operation with a channel of Steam Generator AP (EEAS 1 or EEAS 2) in the tripped condition renders EEAS susceptible to single failure scenarios. With a channel of Steam Generator AP in trip, certain single failures concurrent l with a MSIS actuation can result in initiation of EFW to a faulted Steam Generator. Other single failures can result in failure of automatic control of Steam Generator level and could allow Steam Generator overfill. Placing a channel of Steam Generator AP in the tripped condition is acceptable for up to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because operating experience has demonstrated the low probability of the above single failure scenarios to occur.

Operation with a channel of RWT Level - Low in the tripped condition renders the RAS susceptible to a single failure scenario. With a channel of RWT Level

- Low in trip, concurrent with the injection phase of a valid SIAS actuation, and a single failure of another RWT Level - Low channel would result in a RAS ,

l Actuation. These sequence of events would cause the ECCS suction to be !

shifted from the RWT to the containment sump prematurely. Placing a channel l of RWT Level - Low in the tripped condition is acceptable for up to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because operating experience has demonstrated the low probability of the above single failure scenario to occur.

]

Table 3.3-3 Action 11 allows for continued operation in the applicable MODES with the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, provided the following conditions are satisfied; One of the inoperable channels has been bypassed and the other inoperable channel has been placed in the tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and all functional units affected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition. An inoperable channel may be placed in the trip conditicn to allow another channel to be bypassed for testing or repair purposes.

l j If an inoperable Steam Generator AP or RWT Level - Low channel is placed in ,

j the tripped condition, it must be removed from the tripped condition within 48 l

hours or the plant must be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . This condition is limited to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because of the single failure vulnerability that exists with one of the steam Generator AP or RWT Level - Low channels in the trip condition.

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5 ARKANSAS - UNIT 2 B 3/4 3-lb Amendment No.

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MARKUP OF CURRENT ANO-2 TECHNICAL SPECIFICATIONS i (FOR INFO ONLY) ;

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TABLE 3.3-1 (Continued) l l

ACTION STATEMENTS l

ACTION 2 - With the number of channels ODERABLE one less than the Total Number of ,

Channels, operation in the applic_able MODJ_S__ START-UB and/cr POWER '

OPER?. TIC" may continue provided the inoperable channel is placed in the i bypassed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . If the inoperable channel is bypassed for greater than 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months , the desirability of maintaining this channel in the bypassed condition shall be reviewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations. The channel shall be returned to OPERABLE status prior to startup following the next COLD SHUTDOWN.

With a channel process measurement circuit that affects multiple functional units inoperable or in test, bypass or trip all associated functional units as listed below.

Process Measurement Circuit Functional Unit Bypassed

1. Linear Power Linear Power Level - High (Subchannel or Linear) Local Power Density - High DNBR - Low Log Power Level - High*

2. Pressurizer Pressure - NR Pressurizer Pressure - High l

Local Power Density -High ,

DNBR - Low I

3. Containment Pressure - NR Containment Pressure - High (RPS) l l Containment Pressure - High (ESEAS)

Containment Pressure - High-High i

, (ESFAS) i

4. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EFAS 1)

Steam Generator 2 AP (EEAS 2) l 5. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

6. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EEAS 1)

7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EEAS 2)

8. Core Protection Calculator Local Power Density - High DNBR - Low

!

Only for failure common to both linear power and log power.

1 ARKANSAS - UNIT 2 3/4 3-5 Amendment No. 9,M9,M6,

__ _ _ _. .. . _ _ _ _ . . _ _ . _ . . . _ _ _ _ _ . . _ _ _ . _ . - . _ ~ . - . . _ . . _ _ _ _ _ _ - < . . _

TABLE 3.3-1 (Continued) :

. j ACTION STATEMENTS ACTION 3 - With the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, operation in the applicable MODES STARTUP :nd/or POWED OPEnATION may continue provided the following conditions are satisfied:

a. Verify that one of the inoperable channels has been bypassed and place the other inoperable channel in the tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and

b. All functional units affected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as lis ;ed I

below:

Process Measurement Circuit Functional Unit Bypassed / Tripped l

l 1. Linear Power Linear Power Level - High (Subchannel or Linear) Local Power Density - High l DNBR - Low Log Power Level - High**

2. Pressurizer Pressure - NR Pressurizer Pressure - High Local Power Density -High DNBR - Low

3. Containment Pressure - NR Containment Pressure - High (RPS)

Containment Pressure - High (ESEAS)

Containment Pressure - High-High (ESEAS)

4. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2).

S. l Steam Generator 2 Pressure Steam Generator 2 Pressure - Low ;

Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

6. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EEAS 1)

7. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EEAS 2) l 1

l 8. Core Protection Calculator Local Power Density - High DNBR - Low i

Operation in the applicable MODES STARTUP and/or POWED OPEnATION may l l continue until the performance of the next required CHANNEL FUNCTIONAL TEST. Subsequent operation in the applicable MODES GTARTUP :nd/or POWER .

l OPERATION may continue if one channel is restored to OPERABLE status and

the provisions of ACTION 2 are satisfied.

- Only for failure or activities common to both linear power and log power.

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4 i ARKANSAS - UNIT 2 3/4 3-Sa Amendment No. 449, 4

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." TABLE 3.3-3 (Continued) d TABLE NOTATION 4

(a) Trip function may be bypassed in this MODE when pressurizer pressure i j is belou 400 psia; bypass shall be automatically removed when

t. pressurizer pressure is 2 500 psia.

1 (b) An SIAS signal is first necessary to enable CSAS logic.

(c)

Remote manual not provided for RAS. These are local manuals at each ESF auxiliary relay cabinet.

ACTION STATEMENTS i ACTION 9 - With the number of OPERABLE channels one less than the Total Number of Channels, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT l STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within I the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . I l

ACTION 10 - With the number of channels OPERABLE one less than the Total I Number of Channels, operation in the applicable MODESSTAnT"P and/cr POWER CPERATION may continue provided the inoperable channel is placed in the bypassed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months . If the inoperable channel is bypassed for greater than 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months , the desirability of maintaining this channel in the bypassed condition shall be reviewed at the next regularly scheduled PSC meeting in accordance with the QA Manual Operations. The channel shall be I returned to OPERABLE status prior to startup following the next COLD I SHUTDOWN.

If an iponerable Steam Generator AP or RWT Level - Low channel is placed in the tripped condition, remove the inoperable channel from the tripped condition within 49 hours5.671296e-4 days 0.0136 hours 8.101852e-5 weeks 1.86445e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and ip COLD SHUTDOWN within the followina 30 hoEEA With a channel process measurement circuit that affects multiple functional units inoperable or in test, bypass or trip all associated functional units as listed below, i l

Process Measurement Circuit Functional Unit Bypassed ,

l

1. Containment Pressure - NR Containment Pressure - High (RPS)

Containment Pressure - High (ESEAS)

Containment Pressure - High-High (ESEAS)

2. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2)

3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (CEAS 2)

4. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EEAS 1)

5. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High Steam Generator 2 AP (EEAS 2)

ARKANSAS - UNIT 2 3/4 3-14 Amendment No.4-34,449,446,

. . - - . . _ . . . - . . . - . - . - - - . -. -. - - -~

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TABLE 3.3-3 (Continusd) 1 f

TABLE NOTATION ACTION 11 - With the number of channels OPERABLE one less than the Minimum Channels OPERABLE requirement, operation in the applicable l

NODESSTARTUP :nd/cr POWER OPERATION may continue provided the following conditions are satisfied.

a. Verify that one of the inoperable channels has been bypassed l and place the other inoperable channel in the tripped i condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and I

l b. All functional units affected by the bypassed / tripped channel shall also be placed in the bypassed / tripped condition as listed below:

Process Measurement Circuit Eunctional Unit Bypassed / Tripped

1. Containment Pressure - NR Contaimment Pressure - High (RPS)

Containment Pressure - High (ESEAS)

Containment Pressure - High-High (ESEAS) l

2. Steam Generator 1 Pressure Steam Generator 1 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2) l

! 3. Steam Generator 2 Pressure Steam Generator 2 Pressure - Low Steam Generator 1 AP (EEAS 1)

Steam Generator 2 AP (EEAS 2) l

4. Steam Generator 1 Level Steam Generator 1 Level - Low Steam Generator 1 Level - High Steam Generator 1 AP (EEAS 1) l I

5. Steam Generator 2 Level Steam Generator 2 Level - Low Steam Generator 2 Level - High i Steam Generator 2 AP (EEAS 2)

If an inoperable Steam Generator AP or RWT Level - Low chann_el is l plaged in the tripped condition, remove the inoperable channel from the tripged condition within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 houts_an.d in COLD SHUTDOWN within_1he._fpllswi_Dg_3Q ho_uts2 Operation in the applicable MODES STARTUP :nd/cr POWEP OPERATION may l ,

continue until the performance of the next required CHANNEL l FUNCTIONAL TEST. Subsequent operation in the applica(le MODES GTARTUP and/cr POWS" OPERATION may continue if one channel is l restored to OPERABLE status and the provisions of ACTION 10 are j satisfied.

ACTION 12 - With the number of OPERABLE channels one less than the Minimum 3 Channels OPERABLE, restore the inoperable channel to OPERABLE status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the j next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months .

ACTION 13 - With the number of OPERABLE channels one less than the Total j Number of Channels, restore the inoperable channel to OPERABLE 4 status within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months ; however, one channel may be bypassed for up to 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months for surveillance testing provided the other channel is OPERABLE.

. ARKANSAS - UNIT 2 3/4 3-15 Amendment No. i&G, 4

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,' 3/4.3 INSTRUMENTATION BASES Plant Protective System (PPS) logic is designed for operation as a 2-out-of-3 logic, although normally it is operated in a 2-out-of-4 mode.

The RPS Logic consists of everything downstream of the bistable relays and upstream of the Reactor Trip Circuit Breakers. The hPS Logic is divided into two parts, Matrix Logic, and Initiation Logic.

Failures of individual bistables and their relays are considered measurement channel failures.

The ESEAS Logic consists of everything downstream of the bistable relays and upstream of the subgroup relays. The ESEAS Logic is divided into three parts, Matrix Logic, Initiation Logic, and Actuation Logic. Failures of individual bistables and their relays are considered measurement ebannel failures.

l Matrir. Logic refers to the matrix power supplies, trip channel bypass contacts, and interconnecting matrix wiring between bistable relay cards, up to, but not including the matrix relays. Matrix contacts on the bistable relay cards are excluded from the Matrix Logic definition since they are addressed as part of the measurement channel.

Initiation Logic consists of the trip path power source, matrix relays and their associated contacts, all interconnecting wiring, and the initiation relays (including contacts).

ESEAS Actuation Logic consists of all circuitry housed within the '

Auxiliary Relay Cabinets (ARCS) used to house the ESF Function; excluding the subgroup relays, and interconnecting wiring to the initiation relay contacts mounted in the PPS cabinet.

For the purposes of this LCO, de-energization of up to three matrix power supplies due to a single failure, such as loss of a vital instrument bus, is to be treated as a single matrix channel failure, providing the affected matrix relays de-energize as designed to produce a half-trip. Although each of the six matrices within an ESEAS Function (e.g., SIAS, MSIS, CSAS, etc.) uses separate power supplies, the matrices for the different ESEAS Functions share power supplies. Thus, failure of a matrix power supply may force entry into the condition specified for each of the associated ESEAS Functional Units.

Table 3.3-3 Action 10 allows for continued operation in the applicable MODES with the number of channels OPERABLE one less than the Total Number of Channels provided the inoperable channel is placed in the bypassed or tripped condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months .

If an inoperable Steam Generator AP or Refuelina Water Tank (RWT) Level - Low channel is placed in the trinoed condition, it must be removed f rom the trippgd

{ condition within 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months or the plant,must be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and ip COLD SHUTDOWN within the followina 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . This 3

condition is limited to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because of the sincle f ailure vulnerability

! that_ exists with one of the Steam Generator AE_of RWT Level - Low channels in the trip conditi m I

ARKANSAS - UNIT 2 B 3/4 3-la Amendment No. 169, i

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. Operation with a chennel of Steam G*nerator AP (EEAS 1 or EEAS 2) in the

. tripped condition renders EEAS susceptible to sincle failure scenarios. With a channel of Steam Generator AP in trio, certain sincle failures concurrent with a MSIS actuation can result in initiation of EFW to a faulted Steam Generator. Other sinale failures can result in failure of automatic control--

of Steam Generator level and could allow Steam Generator overfill. Placin a channel of Steam Generator AP in the trioped condition is acceptable for up to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because operat_ino experience has demon _s_trated the low probability of the above single failure scenarios to occur.

Operation with a channel of RWT Level - Low in the tilpoed condition renders the RAS susceptible to a sinole failure scenario. With a channel of RWT Level

- Low in trip, concurrent with the iniection phase of a valid SIAS actuation, and a sinale failure of another RWT Level - Low channel would result in a RAS Actuation. These secuence of events wouLd cause the ECCS suction to be shifted from the RWT to the containment sump prematurely. Placino a channel l of RWT Level - Low in the tripped condition is acceptable for up to 48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months j because operatina experience has demonstrated the low probability of the above single failure scenario to occur.

Table 3.3-3 Action 11 allows for continued operation if the applicable MODES j with the number of channels OPERABLE,pne less than the Minimum Channels OPERABLE requirement, provided the followinc conditi.ons are satisfied One of the inoperable channels has been bypassed and the other incoerable channel has been-claced in the trioned condition within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months , and all functional units affected by the bvpassed/ tripped channel shall also be placed in the bypassed / tripped condition. An inoperable channel may be olaced in the t '"

condition to allow another channel to be bypassed for testino or repair l purposes.

]

l If an inoperable Steam Generator AP or RWT Level - Low channel is placed in 1 the tripped condition, it must be removed from the tripped condition within 48 l hours or the plant must be in at least HOT STANDBY within the next 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and i in_Cokp SHUTDOWN within the followino 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months . This condition is limited to )

48 hours5.555556e-4 days 0.0133 hours 7.936508e-5 weeks 1.8264e-5 months because of the sincle failure vulnerability that exists with one of l the Steam Generator AP or RWT Level - Low channels in the trio condition. l i

I ARKANSAS - UNIT 2 3 3/4 3-la Amendment No. 169,

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ML20151J337

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