ML20073C473
| ML20073C473 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/07/1983 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20073C390 | List: |
| References | |
| NUDOCS 8304130177 | |
| Download: ML20073C473 (11) | |
Text
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ENCLOSURE 1 PROPOSED TECHNICAL SPECIFICATION CHANGES BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, $dD 3 (TVA BFNP TS 176 SUPPLEMENT 4) i i
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TABLE 4.1.8 RFJCICR PROTBCTION SYSTD4 (SCRAM) INSTRUMENT CALIBRATION MINIMUM CALIBEATICM FRE)DEKIES FOR REACTOR PPoTECTION INSTRUMEfff CHANNEIS Instrument channel Group (1)
Calibration Minimum troquency (2)
C Comparison to APRit on Control-Note (4)
IRM High Flur led startups, (6)
Once every 7 days APRM High Flux B
Heat salance output Signal Calibrate Flow Bias Signal (7)
Once/ operating cycle B
Flow Bias signal B
TIP System Traverse (8)
Every 1000 Effective LPRM Signal Full Power Hours A
Standard Pressure Source Every 3 Months Righ Reactor Pressure A
Standard Pressure Source Every 3 Months High Drywell Pressure A
Pressure Standard Every 3 Months Reactor Iow Water Level Note (5) tute (5) tilgh Water Level in Scram Discharge Volume Every 3 Months A
Standard vacuum Source 2 ' Turbine Condenser Low vacuum Note (5) 0 Main Steam Line Isolation Valve Closure A
Note- (5)
Main Steam Line High Radiation 3
Standard Current Source (3)
Every 3 Months Turbine First Stage Pressure Permissive A
Standard Pressure Source Every 6 Months Turbine Cont. Valve Fast Closure or A
Standard Pressure Source Once/ operating' cycle Turbine Trip Note (5)
A Note (5)
Turbine Stop valve Closure 0
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31 SASES modes.
In the power range the APRM system provides required protection.
Ref. Section 7.5.7 TSAR. Thus. the IRH System is not required in the Run mode. The APRM's and the IRM's provide adequate coverage in the startup and intermediate range.
The high reactor pressure, high drywell pressure, reactor low water level and scran dischstge volume high level scrams are required for Startup and Run modes of plant operation. They are, therefore, required to be opera-tional for these modes of' reactor operation.
The requirement to have the scrad functions as indicated in Table 3.1.1 operable to the Refuel mode is to asaure that shifting to'the Refuel mode during resetor pover operation does not divinish the need for the reactor protection systes.
The turbine condenser low vacuum scram is only required during power operation and must be bypasoed'to start up the unit.
Below 154 psig tur-bine first stage pressure (30% of rated), the scram signal due to turbine stop valve clovure, and turbine control valve fast closure.or turhine trip jia bypassed because flux auf pressure scram are adequate to protect the reactor.
j Because'of the APRM downscals limit of > 3% when in the Run mode and high level limit of ~< 15% when in the Startup Mode, the transition between the Startup and Run Modes must be made with the APRM instrumentation indicating between 31.and 15: of rated power or a control rod scran will occur. In addition, the IRM system must be indicating below the High Flux setting (120/125 of scale) or a scras will occur when in the Startup Mode. For
___ normal operating conditions, these limits provide assuracca of. overlap between the IRM system and APRM system so that there are no " gaps" in the power level indications (i.e., the power level is continuously monitored
' rom beginning of startup to full power and from full power to shutdown).
When power is being reduced, if a transfer to the Startup mode is made sad the IRM's have not been fully inserted (a maloperational but not impossible condition) a enntrol rod block immediately occura so that reactivity inser-tion by control rod withdrawal cannot occur.
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1 TABLE 4.1.3 REACTOR PROTECTION SYSTEM (SCRAM) INSTRUMENT CALIBRATION i
MININUN CALIBRATION FREQUENCIES FOR REAcroR PROTECTION INSTRUMENT CRANNELS Instrument channel Group (1)
Calibration Minimum Frequency (2)
Note (4)
IRet Nigh Flux C
Comparison to APRM on Control-led startups (6)
APRM sigh Flux Output Signal B
Heat Balance Once every 7 days Flow Bias Signal B
Calibrate Flow Bias Signal (7)
Once/ operating cycle LPRM Signal 5
TIP System Traverse (8)
Every 1000 Effective Full Power Hours l
Righ Reactor' Pressure A
Standard Pressure Fource Every 3 Months Migh Drywell Pressure A
Standard Pressure Source Every 3 Months Reactor Iow Water Level A
Pressure Standard Every 3 Months High Water Level in Scram Discharge Volume A
Note (S) mte (S)
$ Turbine condenser Low vacuum A
Standard Vacuum Source Every 3 Months i
Main Steam Line Isolation Valve Closure A
Note (S)
Note (5)
Main Steam Line High Radiation B
Standard Current source (3)
Every 3 Months Turbine First Stage Pressure Permissive A
Standard Pressure Source Every 6 Months Turbine Cont. Valve Fast Closure or A
Standard Pressure Source Once/ operating cycle l
Turbine Trip turbine Stop Valve Closure A
Note (5)
Note (5) 4 h
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301 easts In the power range the APRM system provides required protection.
modes.
Ref. Section 7.5.7 TSAR. Thus, the IRM System is not required in the Run mode. The APRM's and the IRM's provide adequate coverage in the startup and intermediate range.
The high reactor pressure, high dryvell pressure, reactor lov vater level and scran discharge volume high level scrass are required for Startup and Run modes of plant operation. They are, therefore, required to be opera-tional for these modes of' reactor operation.
The requirement to have the scred functions as indicated in Table 3.1.1 opersble in the Refuel mode is to seaure that shifting to the Refuel mode during resctor power operation does not diminish the need for the reactor protection system.
The turbine condenser low vacuum scram is only required during power operation and must be bypasoed to start up the unit.
Below 154 psig tur-bine first stage pressure (30% of rated), the scram signal due to turbine closure or tu bine trip stop valve closure
- and turbine control valve fastisbypassedbecausef'luzanh pressure scram are adequate to protest the reactor.
Because'of the APRM downseals limit of > 3% when in the Run mode and high level limit of < 15% when in the Startup Mode, the transition between the Startup and Run Modes must be made with the APRM instrumentstion indienting
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between 3% and 15% of rated pewer or a control rod scran vill occur. In addition, the IRM system must be indicating below the High Flux setting (120/125 of scale) or a scram vill occur when in the Startup Mode. For normal operating conditions, these limits provide assurases of overlap between the IL'i system and APRM system so that there ara no "gsps" in the power level indications (i.e., the power level is continuously monitored
' rom beginning of startup to full power and from full power to shutdown).
When power is being.2ducod, if a transfer to the Startup mode is made and the IRM's have not been fully inserted (a m41 operational but not impossitio condition) a enntrol rod block immediately occura so that reactivity inser-tion by control rod withdrawal cannot occur.
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TABLE 4.1.8 REACTOR PROTECTION SYSTEM (SCRAM) INSTRUMENT CALIBRATICN MINIMUM CALIBRATION FREQUENCIES FOR REACTOR PROTECTION INSTRUMENT CHANNELS Instrument Channel Group (1)
Calibration Minimum Frequency (2)
C Comparison to APRM on Control-Note (4)
IM High Flux led startups (6)
.Once every 7 days APRM Righ Flus B
Heat Balance Output Signal Calibrate Flow Bias Signal (7)
Once/ operating cycle B
Flow Bias Signal B
TIP System Traverse (8)
Every 1000 Effective LPPM. Signal Full Power Hours A
Standard Pressure Source Every 3 Months High Reactor Pressure A
Standard Pressure Source Every 3 Months Migh Drywell Pressure A
Pressure Standard Every 3 Months Reactor Iow Water Level Note (5)
A Note (5)
High Water Level in Scram Discharge Volume A
Standard vacuum Source Every 3 Monthe Turbine Condenser Low vacuum tote (5)
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Main Steam Line Isolation valve closure A
Note (5)
Standard Current Source (3)
Every 3 Months B
Main Steam Line High Radiation Turbine First Stage Pressure Permissive A
Standard Pressure Source Every 6 Months A
Standard Pressure Source Once/ operating cycle
, Turbine Cont. Valve Fast Closure or l
Turbine Trip Note (5)
A Note (5)
Turbine Stop Valve closure 9
which a scram would be required but not be able to perform its function adequately.
A source range monitor (8350 system is also provided to supply additional neutron level information during startup but has no scram functions.
Ref. Section 7.5.4 FSAR.
Thus, the IRM is required in the Refuel and Startup modes.
In the power range the APRM system provides required protection.
Ref. Section 7.5.7 FSAR.
n us, the IRM System is not required in the Run mode.
The APRM's and the IRM's provide adequate coverage in the startup and intermediate range.
The high reactor pressure, high drywell pressure, reactor low water level and scram discharge volume high level scrans are required for Startup and Run modes of plant operation.
Wey are, therefore, required to be operational for these modes of reactor I
operation.
The requirement to have the scram functions as indicated in Table 3.1.1 operable in the Refuel mode is to assure that shif ting to the Refuel mode during reactor pc,:ser operation does not diminish the need for the reactor protection system.
The turbine condenser low vacuum scram is only required during power operation and must be bypassed to start up the unit.
Below 154 psig turbine first stage pressure (305 of rated), the scram signal due to turbine stop valve closure, iand turbine control valve tast closure or turbine trip is bypassed because flux and pressure scram are adequate to protect the reactor.
Because of the APRM downscale limit of 2: 35-when in the Rtn mode and high level limit of 5 155 when in the startup Mode, the transition between the startup and Run Modes must be made with the APRM instrumentation indicating between 35 and 155 of rated power or a control rod scram will eccur.
In addition, the IRM system must be indicating below the High Flux setting (120/125 of scale) or a scram will occur when in the Startup Mode.
For normal operating conditions, these limits provide assurance of overlap between the IRN system and APRM system so that there are no agaps in the power level indications (i.e., the power level a
is continuously monitored from beginning of startup to full power and from full power to shutdoun).
When power is being reduced, if a transfer to the Startup mode is made and the IBM's have not been fully inserted (a maloperational but not impossible condition) a control rod block immediately occurs so that reactivity insertion by control rod withdrawal cannot occur.
43
ENCLOSURE 2 JUSTIFICATION AND EXPLANATION TVA BFNP TS 176 SUPPLEMENT 4 Pages 40 and 44 (Units 1 and 2)
Pages 39 and 43 (Unit 3)
The proposed change is to add Instrument Channel " Turbine Control Valve Fast Closure or Turbine Trip" to Table 4.1.B, Reactor Protection System Instrument calibration frequencies. The technical specifications currently have this instrument channel in Table 3.1. A, RPS Instrumentation Requirement, and Table 4.1.A, RPS Instrumentation Functional Test Frequencies. This addition to Table 4.1.B is needed to make these tables on RPS instrumentation consistent.
By TVA application for license amendment TVA BFNP TS 162, Tables 3 1. A and 4.1.A were revised by combining trip functions " Turbine Control Valve Fast Closure" and " Turbine Control Valve - Loss of Control Oil Pressure" into one, entitled " Turbine Control Valve Fast Closure or Turbine Trip."
This change was done for clarification only. The proposed change was approved and issued as amendment Nos. 85, 82, and 56 to Browns Ferry units 1, 2, and 3 licenses respectively, dated. July 22, 1982. This change was addressed in the Safety Evaluation Report prepared in support of those license amendments. This change to Table 4.1.B was inadvertently not included in TVA submittal TS 162 but is needed for consistency. The changes to the table and Bases in this TS 176 i
Supplement 4 are for clarification only.
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