ML18053A552
| ML18053A552 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 09/02/1988 |
| From: | CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML18053A551 | List: |
| References | |
| NUDOCS 8809070322 | |
| Download: ML18053A552 (5) | |
Text
ATTACHMENT Consumers Power Company Palisades Plant Docket 50-255 PROPOSED PAGES TECHNICAL SPECIFICATIONS CHANGE REQUEST I
8809070 I
~DR ADS~ 880902 05000255 RNU OC0888-0088-NL04 CORE EXIT THERMOCOUPLES 4 Pages
3.17 INSTRUMENTATION AND CONTROL SYSTEMS (Contd)
If the bypass is not effected, the out-of-service channel (Power Removed) assumes a tripped condition (except high rate~of y~hange of power, high power level and high pressurizer pressure),
which results in a one-out-of-three channel logic. If, in the 2 of 4 logic system of either the reactor protective system or the engineered safeguards system, one channel.is bypassed and a second channel manually placed in a tripped condition, the res~lting logic is 1 of 2.
At rated power, the minimum operable high-power,level channels is 3 in order to provide adequate flux tilt detection.
If only 2 channels are operable, the reactor power level is reduced to 70% rated power which protects the reactor from possibly exceeding design peaking factors due to '
undetected flux tilts and from exceeding dropped rod peaking factors in the event that a turbine runback signal is required from the power range channels.
The engineered safeguards system provides a 2 of 4 logic on the signal used to actuate the equipment connected to each of the 2 emergency diesel generator units.
Two start-up channels are available any time reactivity changes are deliberately being introduced into the reactor and the neutron p~wer is not visible on the log-range nuclear instrumentation or above 10
% of rated power.
This ensures that redundant start-up instrumentation is available to operators to monitor effects of reactivity changes when neutron power levels are only visible on the start-up channels.
In the event only one start-up range channel is available and the neutron power level is sufficiently high that it is being.monitored by ~oth channels of log-range instrumentation, a startup can be performed in accordance with footnote (d) of ~able 3.17.4.
Sixteen (four per core quadrant) environmentally qualified core exit I
thermocouples (cable and connectors) with readout from 0 to 2300°F are I
provided for monitoring the potential approach to inadequate core I
cooling.
The core exit thermocouples are in integral part of the I
incore detector assembly and are located at the top of.each incore I
assembly to measure primary coolant core outlet temperatures.
I References (1)
Update FSAR, Sections 7.2.2 and7.2.7.
I 3~77 Amendment. No.
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OC0888-0088-NL04
No
- 8.
- 9.
- 10.
- 11.
- 12.
- 13.
- 14.
- 15.
- 16.
Functional Unit Pressurizer Water Level (LI-0102)
Pressurizer Code Safety Relief Valves Position Indication (Acoustic Monitor or Temperature Indication)
Power Operated R~lief Valves (Acoustic Monitor or Temperature Indication)
PORV Isolation Valves Positipn Indication Subcooling Margin Monitor Auxiliary Feed Flow Rate Indication Auxiliary Feedwater Actuation System Sensor Channels Auxiliary Feedwater.
Actuation System Actuation Channels Excore Detector
( )
- Core Exit Thermocouples OC0888-0088-NL04 Table 3~17.4 (Cont'd)
Minimum Operable Channels 2
1 per Valve 1 per Valve 1 per Valve 1
1 per flow)
Controh)
Valve 2 per stetW) generator 4/core Quadrant (1, m, n, o) 3-Sla Minimum Degree of Redundancy 1
1 None None Permissible Bypass Conditions Not required in Cold or Refuel-ing Shutdown Not Required below 325°F Not required when PORV isolation valve is closed and its indication system is operable Not required when reactor is depressurized and vented through a vent i:::l.3 sq.in.
Not required below 515°F Not required below 325°F Not required below 325°F Not required below 325°F None Not required below 325°F Amendment No.
~7.~S, 9~,
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Table 3.17.4 (Cont'd)
(e)
Auxiliary Feedwater System Actuation System Sensor Channels contain pump auto initiation circuitry. If two sensor channels for one steam generator are inoperable, one of the steam generator low level bistable modules in one of the inoperable channels must be in the tripped condition.
(f)
With one Auxiliary Feedwater Actuation System Actuation Channel inoperable, in lieu of the requirement of 3.17.2, provide a second licensed operator in the control room within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
With both inoperable, in lieu of following the requirements of 3.17.2, start and maintain in operation the turbine driven auxiliary feed pump.
(g)
Calculate the Quadrant Power Tilt using the excore readings at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when the excore detectors deviation alarms are inoperable.
(h)
With two flow rate indicators inoperable for a given control valve, the control valve shall be considered inoperable and the requirements of 3.5.2(e) apply.
(1)
(m)
(n)
(o)
The provisions of Specification 3.0.4 are not applicable.
The environmentally qualified core exit thermocouples are used in determining the minimum channels operable requirement.
With the number of OPERABLE Core Exit Thermocouples less than four per core quadrant but greater than or equal to two per core quadrant, in lieu of the requirement of 3.17.2, either restore the inoperable channel(s) to OPERABLE status within 7 days if repairs are feasible without shutting down or prepare and submit a Special Report to the Commission within 30 days following the event outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status.
With the number of OPERABLE Core Exit Thermocouples less than two per core quadrant, in lieu of the requirements of 3.17.2, either restore two core exit thermocouples per core quadrant to OPERABLE status within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />, or be in HOT SHUTDOWN or below within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
3-8lb Amendment No.
9~. 9S, OC0888-0088-NL04 I
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TABLE 4.1.3 Minimum Frequencies for Checks, Calibrations & Testing of Miscellaneous Instrumentation and Controls (Contd)
Channel DescriEtion Function Frequencl'.:
Surveillance Method 21 Core Exit Thermocouples( 6)
- a.
Check M
- a.
Comparison of Channels
/.
- b.
Calibrate (6)
- b.
Known voltage substituted for I
thermocouple I
(6)
Only.applicable to the environmentally qualified core exit thermocouples.
These thermocouples will be I
calibrated on a refueling cycle frequency.
I 4-llb Amendment No.
OC0888-0088-NL04