ML20216B448

Proposed Tech Specs 4.2.C,exempting Neutron Detectors from Channel Calibr Requirements

ML20216B448
Person / Time
Site:	Cooper
Issue date:	04/02/1998
From:	NEBRASKA PUBLIC POWER DISTRICT
To:
Shared Package
ML20216B450	List: ML20216B448 ML20217Q255
References
NUDOCS 9804130471
Download: ML20216B448 (6)

Text

l I

4 F. Punctional Test - A functional test is the manual operation or initiation of a system, subsystem or component to verify that it functions within design tolerances (e.g. the manual start of a core spray pump to verify that it runs and that it pumps the required volume of water) .

F.A ceaseous Radwaste Treatment System - A GACEOUS RADWASTE TREA'INENT SYSTEM is any system designed and installed to reduce radioactive gaseous effluents by collecting primary coolant system offgases from the primary system and providing for delay or holdup for the purpose of reducing the total radioactivity prior to release to the environment.

G. Hot Standbv condition - Hot standby condition means operation with coolant temperature greater than 212*F, system pressure less than 1000 psig, and the mode switch in "Startup/ Hot Standby".

H. Immediate -

Immediate means that the required action will be initiated as soon as practicable considering the safe operation of the unit and the importance of the required action.

I. Instrumentation I

1. Instrument Punctional Test - Analog instrument functional test means the injection of a simulated signal into the instrument as close to the sensor as {

i practical to verify the proper instrument channel response, alarm and/or I initiating action. Bistable channels. - the injection of a simulated signal into the sensor to verify OPERABILITY including alarm and/or trip functions. ,

i 2.

A Instrument Calibration -

An instrument calibration means the adjustment, as j

1. 1. necessary, of an instrument signal output so that it corresponds, within  !

i.StCo.4- acceptable range, and accuracy, to a known value(s) of the parameter which the j h% instrument monitors. Calibration shall encompass the entire instrument I do.4e_ckt#".> including sensor, alarm /or trip functions and shall include the functional '

wecoL# td test. 1 The calibration may be performed by any series of sequential, do overlapping or total channel steps such that tle entire channel is calibrated.

• d Calibration of instrument channels with resistance temperature detector (RTD) or thermocouple sensors shall consist of verification of operability of the  !

M sensing element, and normal calibration, of the remaining adjustable devices  !

gMt% in the channel.

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3. Instrument channel - An instrument channel means an arrangement of a sensor and l auxiliary equipment required to generate and transmit a signal related to the plant parameter monitored by that instrument channel, i

4. Instrument check - An instrument check is the qualitative determination of l acceptable operability by observation of instrument behavior during operation.

This detennination shall include, where possjble, comparison of the instrument with other independent instruments measuring the same variable.

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5. Locic System Punctional Test - A LOGIC FUNCTIONAL TEST shall be a test of all logic components (i.e., all relays and contacts, trip units, solid state logic elements, etc.) of a logic circuit, from as close to the sensor as practicable up to, but not including, the actuated device, to verify OPERABILITY. The LOGIC SYSTEM FUNCTIONAL TEST may be performed by means of any series of sequential, overlapping, or total system steps so that the entire logic system is tested.

6. Protective Action - An action initiated by the protection system when a limiting safety system setting is reached. A protective action can be at a channel or system level.

7. Protective Function - A system protective action which results from the protective action of the channels monitoring a particular plant condition.

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NOTES FOR TABLES'4.2.A THROUGH 4.2.F

1. Initially 5 once every month until exposure -(M as ' defined on Figure 4.1.1) 2.0 is X 10 ; thereafter,- according to Figure 4.1.1 (after- NRC approval). The compilation of instrument failure rate data may include data obtained from other boiling. water reactors for which the same design instrument operates in an environment similar to that of CNS.

2.

Functional' tests shall'be' performed before each startup with a required frequency not to exceed once per week.

3. This instrumentation is excepted from the functional test definition. The functional test. will' consist : of applying simulated inputs. Local alarm lights representing upscale and downscale trips will be verified but no rod block - will be produced at this time. .The inoperative trip will be initiated to produce a ~ rod block (SRM and IRM inoperative also bypassed with the mode switch in RUN) . The functions that cannot - be verified to produce a rod block directly will be verified during the operating cycle.

4.

. Simulated automatic actuation shall be performed once each operating cycle. .Where possible, all logic system functional tests will be performed using the test jacks.

5. Reactor low water level and high drywell pressure are not included on Table 4.2.A since they are tested on Table 4.1.2.

6.

The logic system functional tests shall include an actuation of time delay relays and timers necessary for proper functioning of the trip systems.

7. These units are tested as part of the Core Spray System tests.

G. The flow bias comparator will be tested by putting one flow unit in " Test" '(producing

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a rod block) and adjusting the test input to obtain comparator rod block. The flow bias upscale will be verified by observing a local upscale trip light -during i- operation and verifying that it will produce a rod block during the operating cycle.

9. Performed during operating cycle. Portiens of the logic is checked mcare frequently during functional tests of the functions that produce a rod block.

10. The detector will be inserted during each operating cycle and the proper amount of travel into the core verified.

11 '. Surveillance requirements for this system are defined in Table 4.21.A.1.

12. Surveillance requirements for this system are defined in Table 4.21.A.2.

13. This instrumentation is exempted from the instrument channel. test definition. The instrument channel functional test will consist of injecting a simulated electrical signal into the measurement channels to test the alarm and trip functions.

14. Calibration shall be performed using a standard current source. The current source provides instrument channel alignment. Calibration using a radiation source shall be made each refueling outage.

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' Amendment No. 158 03/02/93  ;

i F. Functional Test - A functional test is the manual operation or initiation of a system, subsystem or component to verify that it functions within design tolerances (e.g. the manu'al start of a core spray pump to verify that it runs and that it pumps the required volume of water).

F.A gaseous Radwaste Treatment System - A GASEOUS RADWASTE TREA'IMENT SYSTEM is any system designed and installed to reduce radioactive gaseous effluents by collecting primary l coolant system offgases from the primary system and providing for delay or holdup for the purpose of reducing the total radioactivity prior to release to the environment.

G. Hot Standbv condition - Hot standby condition means operation with coolant temperature greater than 212*F, system pressure less than 1000 psig, and the mode switch in "Startup/ Hot Standby".

1 H. Immediate - Immediate means that the required action will be initiated as soon as practicable considering the safe operation of the unit and the importance of the required action.

I. Instrumentation

1. Instrument Functional Test - Analog instrument functional test means the injection of a simulated signal into the instrument as close to the sensor as practical to verify the proper instrument channel response, alarm and/or initiating action. Bistable channels - the injection of a simulated signal into the sensor to verify OPERABILITY inc.luding alarm and/or trip functions.

2. Instrument calibration -

An instrument calibration means the adjustment, as necessary, of an instrument signal output so that it corresponds, within acceptable range, and accuracy, to a known value (s) of the parameter which the instrument monitors. Calibration shall encompass the entire instrument including sensor, alarm /or trip furetions and shall include the functional test. An exception is that the neutron detectors need not be subject to the requirements of channel calibration. The calibration may be performed by any series of sequential, overlapping or total channel steps such that the entire.

channel is calibrated. Calibration of instrument channels with resistar.ce temperature detector (RTD) or thermocouple sensors sha31 consist of verification of operability of the sensing element, and norma'. calibration, of the remaining adjustable devices in the channel.

3. Instrument enannel - An instrument channel means an arrangement of a sensor and i auxiliary equipment required to generate and transmit a signal related to the plant parameter monitored by that instrument channel.

4. Instrument check -

An instrument check is the qualitative determination of acceptable operability by observation of instrument behavior during operation.

This determination shall include, where possible, comparison of the instrument with other independent instruments measuring the esme variable.

5. Loaic System Functional Test - A LOGIC FUNCTIONAL TEST shall be a test of all logic components (i.e., all relays and contacts, trip units, solid state logic elements, etc.) of a logic circuit, from as close to the sensor as practicable up to, but not includin m the actuated device, to verify OPERA'3ILITY. The LOGIC SYSTEM FUNCTIONAL TEST may be performed by means of any series of sequential, overlapping, or total system steps so that the entire logic oystem is tested.

6, Pp tective Action - An action initiated by the protectioT system when a l' Siting safety system setting is reached. A protective action can be at a l cunnel or system level, j i

7. 'f rot e ct ive Function - A system protective action which results from the  ;

protective action of the channels monitoring a particular plant condition.

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NOTES FOR TABLES 4.2.A THROUGH 4.2.F i

l 1. Initially 5 nee every month until exposure (M as defined on Figure i 2.0 X 10 ; thereafter, according to Figure 4.1.1 (after NRC approval). 4.1.1) is The l compilation of instrument failure rate data may include data obtained from other l boiling water reactors for which the same design instrument operates in an l environment similar to that of CNS.

l 2. Functional tests shall be performed before each startup with a required frequency not to exceed once per week.

l

! 3. This instrumentation is excepted from the functional test definition. The functional l test will consist of applying simulated inputs. Local alarm lights representing l

upscale and downscale trips will be verified but no rod block will be produced at

! this time. The inoperative trip will be initiated to produce a rod block (SRM and l IRM inoperative also bypassed with the mode switch in RUN). The functions that I

cannot be verified to produce a rod block directly will be verified during the operating cycle.

l 4. Simulated automatic actuation shall be performed once each operating cycle. Where j possible, all logic system functional tests will be performed using the test jacks.

5. Reactor low water level and high drywell pressure are not included on Table 4.2.A since they are tested on Table 4.1.2.

6. The logic system functional tests shall include an actuation of time delay relays and timers necessary for proper functioning of the trip systems.

7. These units are tested as part of the Core Spray System tests.

l 8. The flow bias comparator will be tested by putting one flow unit in " Test" (producing

! a rod block) and adjusting the test input to obtain comparator rod block. The flow l bias upscale will be verified by observing a local upscale trip light during l operation and verifying that it will prodace a rod block during the operating cycle.

9. Performed during operating cycle. Portions of the logic is checked more frequently during functional tests of the functions that produce a rod block.

10. The detector will be inserted during each operating cycle and the proper amount of

! travel into the core verified.

11. Surveillance requirements for this system are defined in Table ?.21.A.1.

12. Surveillance requirements for this system are defined in Table 4.21.A.2.

13. This instrumentation is exempted from the instrument channel test definition. The instrument channel functional test will consist of injecting a simulated electrical signal into the measurement channels to test the alarm and trip functions.

14. Calibration chall be performed using a standard current source. The current source provides - instrument channel alignment. Calibration using a radiation source shall be made each refueling outage.

15. Neutron detectors are excluded from the requirements of channel calibrations.

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