ML20155E791

Corrected Amends 112 & 114 to License NPF-1,re Thermal Power,Surveillance Requirements & Control & Dilution to Moderate Temp Coefficient

ML20155E791
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	04/07/1986
From:	NRC
To:
Shared Package
ML20155E789	List: ML20155E786 ML20155E791
References
TAC-45175, NUDOCS 8604180126
Download: ML20155E791 (4)

Text

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o-POWER DISTRIBUTION LIMITS LIMITING CONDITION FOR OPERATION (Continued) b.

THERMAL POWER shall not be increased above 90% of RATED THERMAL POWER unless the indicated AFD is within the 15% target band and ACTION 2.a)l), above has been satisfied.

THERMAL POWER shall not be increased above 50% of RATEf) THERMAL c.

POWER unless the indicated AFD has not been outside of the 15%

target band for more than 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> penalty deviation cumulative during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

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SURVEILLANCE RE0VIREMENTS

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4.2.1.1 The indicated AXIAL FLUX DIFFERENCE shall be determined to be within its limits during POWER OPERATION above 15% of RATED THERMAL POWER by:

Monitoring the indicated AFD for each OPERA 8LE excore channel, a.

at least once per 7 days when the AFD Monitor Alarm is OPERABLE, j

and h

b.

Monitoring and logging the indicated AXIAL FLUX DIFFERENCE for each OPERABLE excore channel at least once per 30 minutes when j

the AXIAL FLUX DIFFERENCE Monitor Alarm is inoperable.

The logged values of the indicated AXIAL FLUX DIFFERENCE shall be

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assumed to exist during the interval preceding each logging.

I 4.2.1.2 The indicated AFD shall be considered outside of its 15% target band when at least 2 of 4 or 2 of 3 OPERABLE excore channels are indicating the AFD to be outside the target band.

target band shall be accumulated on a time basis of: POWER OPERATION outside of the 15%

i One minute penalty deviation for each one minute of POWER a.

OPERATION outside of the target band at THERMAL POWER levels equal to or above 50% of RATED THERMAL POWER, and b.

One-half minute penalty deviation for each one minute of POWER OPERATION outside of the target band at THERMAL POWER levels i

below 50% of RATED THERMAL POWER.

TROJAN-UNIT 1 3/4 2-2 Amendment No. 770, 114 k

8604180126 860407 1

PDR ADOCK 05000344 P

PDR

j TABLE 4.3-7

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ACCIDENT MONITORING INSTRUMENTATION SURVEILLANCE REQUIREMENTS CHANNEL CHANNEL CHl.NNEL FUNCTIONAL LMSTRUMENT CHECK CALIBRATION TEST 1.

Reactor Coolant System M

R Subcooling Margin Monitor 2.

PCRV Position Indicator M

R 3.

PORY Block Valve Position M

R Indicator 4.

Safety Valve Posit'on M

R Indicator ( Acovit'. cal Flow) 1 5.

Auxiliary Feedwater Flow Rate M*

R q

6.

Pressurizer Water Level M

R i

7.

Containment Atmospheric M

R Pressure (-10 to 190 psig)

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8.

Containment Water Level (Wide M

R Range) 9.

Containment Water Level M

R (Narrow Range)

10. Core Exit Theraccouples M

R**

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11. Reactor Vessel Level Instru-M R

mentation System l

• Not applicable in Modes 1 and 2.

4

• • Calibration shall consist of calibrating the thermocouple indicators.

3 TROJAN-UNIT 1 3/4 3-53 Amendment No. 58, 92, Idf.112 t

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3/4.1 REACTIVITY CONTROL SYSTEMS

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BASES 3/4.1.1 BORATION CONTROL 3/4.1.1.1 SHUTOOWN MARGIN A sufficient SHUTOOWN MARGIN ensures that 1) the reactor can be made subcritical from all operating conditions, 2) the reactivity transients associated with postulated accident conditions are controllable within acceptable limits, and 3) the reactor will be maintained sufficiently subcritical to preclude inadvertent criticality in the shutdown condition.

I SHUT 00WN MARGIN requirements vary throughout core life as a function of fuel depletion, RCS boron concentration, and RCS Tavg. The most restrictive condition occurs at EOL, with Tavg at no load operating temperature, and is associated with postulated steam line break accident and resulting uncontrolled RCS cooldown.

In the analysis of this accident, a minimum SHUTOOWN MARGIN of 1.6% ak/k is initially required to control the reactivity transient. Accordingly, the SHUT 00WN MARGIN requirement is based upon this limiting condition and is consistent with FSAR accident analysis assumptions. With Tavg less than 200*F, the most restrictive reactivity transients resulting from the postulated Boron Oilution Accident are such that a 1.6% ak/k SHUT 00WN MARGIN is initially required.

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3/4.1.1.3 BORON DILUTION A minimum flow rate of at least 3000 GPM provides adequate mixing, prevents stratification and ensures that reactivity changes will be gradual during boron concentration reductions in the Reactor Coolant System. A flow rate of at least 3000 GPM will circulate an equivalent Reactor Coolant System volume of 12,900 cubic feet in approximately 33 minutes. The reactivity change rate associated with boron reductions will therefore be within the capability for operator recognition and control.

3/4.1.1.4 MODERATOR TEMPERATURE COEFFICIENT (MTC)

The limitations on MTC are provided to ensure that the assumptions used in the accident and transient analyses remain valid through each fuel cycle. The surveillance requirement for measurement of the MTC at the beginning and towards the end of each fuel cycle is adequate l

to confirm the MTC value since this coefficient changes slowly due TROJAN-UNIT 1 83/41-1 Amendment No. 5#, 770, 114 4

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!!3. 114

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