ML20205S379

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Proposed Tech Specs Revising SR 3.3.5.2 & Associated Bases to Allow Loss of Voltage & Degraded Voltage Trip Setpoints to Be Treated as Nominal Values in Same Manner as Trip Setpoints for RTS & ESFAS Instrumentation
ML20205S379
Person / Time
Site: Vogtle  Southern Nuclear icon.png
Issue date: 04/19/1999
From:
SOUTHERN NUCLEAR OPERATING CO.
To:
Shared Package
ML20205S375 List:
References
NUDOCS 9904260201
Download: ML20205S379 (10)
v • d • e


Text

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, . Enclosure 3 l

l Vogtle Electric Generating Plant l Request to Revise Technical Specifications

, , Loss of Power Instrumentation Trip Setpoints -

Marked-Up TS and Bases Pages i

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i 9904260201 990419 PDR ADOCK 05000424 P PDR _

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LOP Instrum:ntation )

3.3.5

. ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME I

D. Required Actions and D.1 Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Times not met in MODES AND 1, 2, 3, or 4.

D.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> E. Required Action and E.1 Enter applicable immediately associated Completion Condition (s) and Time not met when the Required Action (s)for the associated DG is associated DG made required OPERABLE by inoperable by LOP DG LCO 3.8.2. start instrumentation.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.3.5.1 Perform COT. 92 days (N5GRT NOTE- e N o m sn a,l SR 3.3.5.2 Perform CHANNEL CALIBRATION with\ Trip Setpoint 18 months and Allowable Value as follows:

A. Loss of voltage Allowable Value 2 2912 V with a time delay of s 0.8 second.

NomiAAl Loss of voltagkTrip Setpoin 2 975 V with a time delay of s 0.8 second.

B. Degraded voltage Allowable Value 2 3683 V with a time delay of s 20 seconds.

$ 8WIA8l /

Degraded voltagebTrip SetpointG3746 V with a time delay of 5 20 seconds.

(continued)

Vogtle Units 1 and 2 3.3.5-2 Amendment No. 96 (Unit 1)

Amendment No. 74 (Unit 2)

INSERT FOR NOTE TO SR 3.3.S.2 NOTE-A channel is OPERABLE with an actual Trip Setpoint value outside its calibration tolerance band, provided the Trip Seipoint value is conservative with respect to its associated Allowable Value and the channel is readjusted to within the established calibration tolerance band of the Nominal Trip Setpoint. A Trip Setpoint may be set more conservative than the Nominal Trip Setpoint as necessary in response to plant conditions.

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LOP DG Start Instrumentation B 3.3.5

. BASES BACKGROUND Trip Setpoints and Allowable Values (continued)

The Trip Setpoints used in the bistables are based on the analytical r 7 _ limits presented in FSAR, Chapter 15 (Ref. 2)4The selection of th

[ 7hg, g /g.//g/ I np detpoints is sJun inat auequate protecuon is provided when all sensor and processing time delays are taken into account.

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I he actual nominal Trip Setpoint entered into the relays is normally '

//f CO/*/ O/N7W s ' more conservative than that required by the Allowable Value.

the easured setpoint does not uceed the Allowable Value, t relay 0 8d 3. 38 7, is con ered OPERABLE.

8 / A/[4#d/h Setpoints a asted in accordance with the Allowable Va ensure that the corwe ences of accidents will be acceptabl , providing the

,/,/%J, FF unit is operated f within the LCOs at the onset the accident and that the equipment ctions as designed.

Allowable Values and/or 'p Setpoints ar pecified for each Function in the LCO. Nomi l Trip Set ints are also specified in the unit specific setpoint calculatio T nominal setpoints are selected to ensure that the setpoint meas d by the surveillance procedure does not exceed the Allowabl alu 'f the bistable is performing as required, if the measured s oint do not exceed the Allowsole Value, the relay is consi ed OPERABL Operation with a Trip Setpoint less conserv e than the nomina ' ip Setpoint, but within I the Allowable Valu is acceptable provided th operation and testing  !

is consistent wit e assumptions of the unit spe ' c setpoint calculation. ch Allowable Value and/or Trip Setpo t specified is more cons ative than the analytical limit assumed in transient l and ace' nt analyses in order to account for instrument u riainties l appr iate to the trip function. These uncertainties are defin 'n the  ;

"U Specific Setpoint Calculation."

APPLICABLE The LOP DG start instrumentation is required for the ESF SAFETY ANALYSES Systems to function in any accident with a loss of offsite power. Its design basis is that of the ESFAS. "

'l (continued)

Vogtle Units 1 and 2 B 3.3.5-2 Revision No. 0

LOP DG Start Instrumsntation B 3.3.5

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BASES  ;

ACTIONS Ej (continued) j required to be entered immediately. The actions of this LCO I provide for adequate compensatory actions to support unit safety.

SURVEILLANCE SR 3.3.5.1 l REQUIREMENTS SR 3.3.5.1 is the performance of a COT. This test is performed every 92 days. A COT is performed on each required channel to ensure the entire channel will perform the intended Function. Setpoints must be found within the specified Allowable Values. The Frequency is based on the known reliability of the equipment and controls and the j multichannel redundancy available, and has been shown to be acceptable through operating experience.

SR 3.3.5.2 SR 3.3.5.2 is the performance of a CHANNEL CAllBRATION. $ )

frJSift 7 The netpoints, as well as the response to a loss of voltage and a

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d c. fed voltage test, shallinclude a b;ngle point verification that the tn,m . es within the required time delay.

A CHANNEL CAllBRATION is performed every 18 months, or approximately at every refueling. CHANNEL CAllBRATION is a

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l complete check of the instrument loop, including the sensor. The test verifies that the channel responds to a measured parameter within the necessary range and accuracy.

The Frequency of 18 months is based on operating experience and j consistency with the typical industry refueling cycle and is justified by the assumption of an 18 month calibration intervalin the ]

determination of the magnitude of equipment drift in the setpoint analysis.

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l (continued) l l

Vogtle Units 1 and 2 B 3.3.5-7 Revision No. O

INSERT FOR HASES FOR SR 3.3.5.2

. This SR is modified by a Note that clarifies the OPERABILITY requirements with respect to the Nominal Trip Setpoint. The Nominal Trip Setpoint considers factors that may affect channel performance such as rack drift, etc. Therefore, the Nominal Trip Setpoint (within the cdbration tolerance) is the expected value for the CHANNEL CAllBRATION.

However, the Aliowable Value is the value that was used for the loss of voltage and degraded grid ctudies. Therefore, a channel with an actual Trip Setpoint value that is conservative with respect to the Allowable Value is considered OPERABLE; but the channel should be reset to the Nominal Trip Setpoint value (within the calibration tolerance) to allow for factors which may affect channel performance (such as rack drift) prior to the next surveillance. A channel may be left with an actual Trip Setpoint value that is conservative to the Nominal Trip Setpoint at any time as necessary.

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r-1 Enclosure 4 I

- 1 Vogtle Electric Generating Plant Request to Revise Technical Speci6 cations Loss of Power Instrnmentation Trip Setpoints Clean Typed TS and flases Pages I

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A LOP instrum:ntation 3.3.5 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME D. Required Actions and D.1 Be in MODE 3. 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> associated Completion Times not met in MODES AND 1, 2, 3, or 4.

D.2 Be in MODE 5. 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br /> E. Required Action and E.1 Enter applicable immediately associated Completion Condition (s) and Time not met when the Required Action (s) for the associated DG is associated DG made required OPERABLE by inoperable by LOP DG LCO 3.8.2. start instrumentation.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY 4

SR 3.3.5.1 Perform COT. 92 days SR 3.3.5.2 -

-NOTE A channel is OPERABLE with an actual Trip Setpoint value outside its calibration tolerance band, :,rovided the Trip Setpoint vslue is conservative with respect to 1 its associated Allowable Value and the channel is 1 readjusted to within the established calibration talerance band of the Nominal Trip Setpoint. A Trip Setpoint may be set more conservative than the Nominal Trip Setpoint as necessary in response to plant conditions.

Perform CHANNEL CAllBRATION with Nominal Trip 18 months l Setpoint and Allowable Value as follows:

A. A. Loss of voltage Allowable Value 2 2912 V with a time delay of s 0.8 second.

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Loss of voltage Nominal Trip Setpoint 2975 V with a time delay of s 0.8 second.

(continued)

Vogtle Units 1 and 2 3.3.5-2 Amendment No. (Unit 1)

Amendment No. (Unit 2) c

LOP instrumsntation l 3.3.5 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY B. Degraded voltage Allowable Value 2 3683 V with a time delay of 5 20 seconds.

Degraded voltage Nominal Trip Setpoint l 3746 V with a time delay of s 20 seconds.

SR 3.3.5.3 NOTE-Not required to be performed for the turbine-driven Auxiliary Feedwater (AFW) pump until 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after Steam Generator pressure is 2 900 psig.

Verify AFW system ESF RESPONSE TIME for loss 18 months on a of voltage and degraded voltage on the 4.16 kV ESF STAGGERED buses within limit. TEST BASIS

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Vogtle Units 1 and 2 3.3.5-3 Amendment No. (Unit 1)

Amendment No. (Unit 2)

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LOP DG Strrt Instrum:ntation '

B 3.3.5 BASES BACKGROUND Trio Setooints and Allowable Values (continued)

The Trip Setpoints used in the bistables are based on the analytical l limits presented in FSAR, Chapter 15 (Ref. 2). These analytical limits '

have been incorporated into SR 3.3.5.2 as the Allowable Values. The selection of these Trip Setpoints is such that adequate protection is provided when all sensor and processing time delays are tak h into I account.

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l APPLICABLE The LOP DG start instrumentation is required for the ESF SAFETY ANALYSES Systems to function in any accident with a loss of offsite power, its design basis is that of the ESFAS.

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(conti7ued)

Vogtle Units 1 and 2 8 3.3.5-2

LOP DG Start Instrumsntation B 3.3.5

-BASES ACTIONS E.1 (continued) required to be entered immediately. The actions of this LCO provide for adequate compensatory actions to support unit safety.

SURVEILLANCE SR 3.3.5.1 REQUIREMENTS SR 3.3.5.1 is the performance of a COT. This test is performed every 92 days. A COT is performed on each required channel to ensure the entire channel will perform the intended Function. Setpoints must be found within the specified Allowable Values. The Frequency is based on the known reliability of the equipment and controls and the multichannel redundancy aveilable, and has been shown to be acceptable through operating experience.

SR 3.3.5.2 SR 3.3.5.2 is the performance of a CHANNEL CAllBRATION. This

. SR is modified by a Note that clarifies the OPERABILITY ,

requirements with respect to the Nominal Trip Setpoint. The Nominal l Trip Setpoint considers factors that may affect channel performance i such as rack drift, etc. Therefore, the Nominal Trip Setpoint (within the calibration tolerance) is the expected value for the CHANNEL CALIBRATION. However, the Allowable Value is the value that was  ;

used for the loss of voltage and degraded grid studies. Therefore, a  ;

channel with an actual Trip Setpoint value that is conservative with  !

respect to the Allowable Value is considered OPERABLE; but the l channel should be reset to the Nominal Trip Setpoint value (within the i calibration tolerance) to allow for factors which may affect channel performance (such as rack drift) prior to the next surveillance. A  ;

channel may be left with an actual Trip Setpoint value that is  !

conservative to the Nominal Trip Setpoint at any time as necessary.

The setpoints, as well as the response to a loss of voltage and a l degraded voltage test, shall include a single point verification that the trip occurs within the required time delay.

A CHANNEL CALIBRATION is performed every 18 months, or approximately at every refueling. CHANNEL CAllBRATION is a l complete check of the instrument loop, including the sensor. The test verifies that the channel responds to a measured parameter within the i necessary range and accuracy. i The Frequency of 18 months is based on operating experience and

, consistency with the typical industry refueling cycle and is justified by the assumption of an 18 month calibration interval in the determination of the magnitude of equipment drift in the setpoint analysis.

(continued)

Vogtle Units f and 2 B 3.3.5-7

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