ML20071H838

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Proposed TS 3.3.6.6,allowing Less than Four Traversing in- Core Probe Machines to Be Operable
ML20071H838
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 07/19/1994
From:
GEORGIA POWER CO.
To:
Shared Package
ML20071H835 List:
References
NUDOCS 9407210305
Download: ML20071H838 (9)
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Text

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Enclosure 3 Edwin I. Hatch Nuclear Plant - Unit 2 Request to Revise Technical Specifications for Traversing Incore Probe (TIP) Operability Requirements Page Change Instructions Remove Page Insert Page 3/4 3-57 3/4 3-57 3/4 3-57b B 3/4 3-4 B 3/4 3-4 F

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INSTRUMENTATION TRAVERSING INCORE PROBE SYSTEM LIMITING CONDITION FOR OPERATION 3.3.6.6 The traversing incore probe system shall be OPERABLE with: ,

a. Four movable detectors, drives, and readout equipment to map the l core, and
b. Indexing equipment to allow all required detectors to be normalized in l a common location.

APPLICABILITY:

When the traversing incore probe is used for:

a. Recalibration of the LPRM detectors and
b. Monitoring the APLHGR, LHGR, or MCPR.

ACTION:

a. With one or more TIP measurement locations inoperable, required measurements may be performed as described in 1 or 2 below.
1. TIP data for an inoperable measurement location may be replaced by data ,

obtained from that string's redundant (symmetric) counterpart if the substitute TIP data were obtained from an operable measurement location and the control rod pattern is octant symmetric, provided the total TIP uncertainty for the present cycle has been measured to be less than 8.7 percent.

2. TIP data for an inoperable measurement location may be replaced by data obtained from the on-line core monitoring system (process computer) normalized with available operating measurements, provided the total number of simulated channels (measurement locations) does not exceed eight,
b. Otherwise, with the TIP system inoperable, suspend use of the system for the above applicable monitoring or calibration functions.
c. The provisions of Specifications 3.0.3 and 3.0.4 are not applicable.

HATCH - UNIT 2 3/4 3-57 techsp\h\94-12u2. pro \l15 l

INSTRUMENTATION  ;

TRAVERSING INCORE PROBE SYSTEM LIMITING CONDITION FOR OPERATION 1

1 SURVEILLANCE RE0VIREMENTS l 4.3.6.6 The traversing incore probe system shall be demonstrated OPERABLE by normalizing each of the above required detector outputs prior to or during use when required for the above applicable monitoring or calibration functions, if not performed within the previous 31 EFPD. .

b HATCH - UNIT 2 3/4 3-57a techsp\h\94-12u2. pro \115 l

1 (This page intentionally left blank.)

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INSTRUMENTATION BASES MONITORING INSTRUMENTATION (Continued) 3/4.3.6.4 POST-ACCIDENT MONITORING INSTRUMENTATION l

The OPERABILITY of the post-accident monitoring instrumentation ensures that sufficient information is available on selected plant param-eters to monitor and assess important variable following an accident.

3/4.3.6.5 SOURCE RANGE MONITORS The source range monitors provide the operator with information on the status of the neutron level in the core at very low power levels during startup. At these power levels,- reactivity additions should not be made without this flux level information available to the operator. When the intermediate range monitors are on scale adequate information is available without the SRMs and they can be retracted.

3/4.3.6.6 TRAVERSING INCORE PROBE SYSTEM The OPERABILITY of the traversing incore probe system with the specified minimum complement of equipment ensures that the measurements obtained from use of this equipment accurately represent the spatial neutron flux distribution in the reactor core.

The specification allows use of substituted TIP data from symmetric channels, adjusted by the plant computer to remove machine and power level dependent biases, if the control rod pattern is symmetric. The source of substituted data may also be calculations performed by the on-line computer core monitoring system which are normalized to available real data. Symmetry is not required for substitution of calculated readings.

3/4.3.6.7 MCRECS ACTUATION INSTRUMENTATION The OPERABILITY of the MCRECS ensures the necessary protective actions will be automatically initiated to provide protection for control room personnel.

3/4.3.6.8 (Deleted)

HATCH - UNIT 2 B 3/4 3-4 techsp\h\94-12u2. pro \96 l

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INSTRUMENTATION

  • TRAVERSINr,INCORE PROBE SYSTEM

-LIMITING CONDITION FOR OPERATION 3.3.6.6. The traversing incore probe system shall be OPERABLE with: i

a. Four/movabledetectors,drivesandreadoutequipmenttomapthe l core, and

( b. Indexing equipment to allow all,fettr[ detectors to be normalized in a common location. g pg i l

APPLICABILITY:

When the traversing incore probe is used for:

a. Recalibration of the LPRM detectors and
b. Monitoring the APLHGR, LHGR, or MCPR l

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%7%e'"%c(lib'"! v' 'g*'L1 "c'y*"' ' 'T"f SURVEILLANCE RE0VIREMENTS 4.3.6.6. The traversing incore probe system shall be demonstrated OPERABLE by normalizing each of the above required detector outputs prior to or during use when required for the above applicable monitoring or calibration-functions, if not performed within the previous 31 EFPD.

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{i -ths and of-Cycle 19r HATCH . UNIT 2 3/4 3-57 Amendment No. 43, 115

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a. With one or more TIP measurement locations inoperable, required n;easurements may be performed as described in 1 or 2 below. I
1. TIP data for an ince trable measurement location may be replaced by data obtained from that string's redundant (symmetric) counterpart if the substitute TIP data were obtained from an operable measurement location and the control rod pattern is octant symmetric, provided the total TIP l uncertainty for the present cycle has been measured to be less than 8.7 percent.
2. TIP data for an inoperable measurement location may be replaced by data obtained from the on-line core monitoring system (process computer) normalized with available operating measurements, provided the total number of simulated channels (measurement locations) does not exceed eight. I
b. Otherwise, with the TIP system inoperable, suspend use of the system for the above applicable monitoring or calibration functions.  ;
c. The provisions of Specifications 3.0.3 and 3.0.4 are not applicable.

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INSTRUMENTATION t

BASES MONITORING INSTRUMENTATION (Continued) 3/4.3.6.4 POST-ACCIDENT MONITORING INSTRUMENTATION The OPERABILITY of the post-accident monitoring instrumentation ensures that sufficient information is available on selected plant param-eters to monitor and a ness important variable following an accident. ..

).t 3/4.3.6.5 SOURCE RANGE MONITORS The source range monitors provide the operator with information on the status of the neutron level in the core at very low power levels -

during startup. At these power levels, reactivity additions should not be made without this flux level information available to'the operator. When the intermediate range monitors are on scale adequate information is i available without the SRMs and they can be retracted. >

3/4.3.6.6 TRAVERSING INCORE PROBE SYSTEM G

N T . '^ OPERABIL Y of the y aversing ore probe system with the '

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formal in theivres ctive out ts. /

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3/4.3.6.7 MCRECS ACTUATION INSTRUMENTATION l .

The OPERABILITY of the MCRECS ensures the necessary protective L actions will be automatically initiated to provide protection for control room personnel. S

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The OPERABILITY of the traversing incore probe system with the I specified minimum complement of equipment ensures that the measurements obtained from use of this equipment accurately represent the spatial neutron flux distribution in the reactor core. i l The specification allows use of substituted TIP data from symmetric channels, I

adjusted by the plant computer to remove machine and power level dependent biases, j

if the control rod pattern is symmetric. The source of substituted data may also  ;

be calculations performed by the on-line computer core monitoring system which are normalized to available real data. Symmetry is not required for substitution of calculated readings. ,

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