ML18095A674
| ML18095A674 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/03/1991 |
| From: | Public Service Enterprise Group |
| To: | |
| Shared Package | |
| ML18095A672 | List: |
| References | |
| LCR-90-18, NUDOCS 9101100258 | |
| Download: ML18095A674 (2) | |
Text
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- l POWER DISTRIBUTION LIMITS BASES
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Although it is intended that the plant will be operated with the AXIAL FLUX DIFFERENCE within the +6, -9% target band about the target flux difference, during rapid plant THERMAL POWER reductions, control rod motion will cause the AFD to deviate outside of the target band at reduced THERMAL POWER levels. This deviation will not affect the xenon redistribution sufficiently to change the envelope of peaking factors which may be reached on a subsequent return to RATED THERMAL POWER (with the AFD within the target band) provided the time duration of the deviation is limited. Accordingly, a 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> penalty deviation limit cumulative during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is provided for operation outside of the target band but within the limits of Figure 3.2-1 while at THERMAL POWER levels between 50% and 90% of RATED THERMAL POWER. For THERMAL POWER levels between 15% and 50% of rated THERMAL POWER, deviations of the AFD outside of the target band are less significant.
The penalty of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> actual time reflects this reduced significance.
Provisions for monitoring the AFD are derived from the plant nuclear instrumentation system through the AFD Monitor Alarm. A control room recorder continuously displays the auctioneered high flux difference and the target band limits as a function of power level. A~~ alarm is received any time the auctioneered high flux difference exceeds the target band limits. *"
seeefia ala:i::m is :i::eeeivee if the AFD em;ieeas i"ts allewaale limi"ts fer a.
el:lHll:llative time sf sHe hsYr EiYriH9 aH:y 24 heur "time periee s"tar"tiag ui"th "the eccurreace ef "the firs"t alarm. Time outside the target band is graphically presented on the strip chart.
Figure B 3/4 2-1 shows a typical monthly target band.
SALEM -
UNIT 1 B 3/4 2-2 Amendment No. 30
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~-
POWER DISTRIBUTION LIMITS BASES
===========================================================
Although it is intended that the plant will be operated with the AXIAL FLUX DIFFERENCE within the +6, -9% target band about the target flux difference, during rapid plant THERMAL POWER reductions, control rod motion will cause the AFD to deviate outside of the target band at reduced THERMAL POWER levels. This deviation will not affect the xenon redistribution sufficiently to change the envelope of peaking factors which may be reached on a subsequent return to RATED THERMAL POWER (with the AFD within the target band) provided the time duration of the deviation is limited. Accordingly, a 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> penalty deviation limit cumulative during the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> is provided for operation outside of the target band but within the limits of Figure 3.2-1 while at THERMAL POWER levels between 50% and 90% of RATED THERMAL POWER. For THERMAL POWER levels between 15% and 50% of rated THERMAL POWER, deviations of the AFD outside of the target band are less significant.
The penalty of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> actual time reflects this reduced significance.
Provisions for monitoring the AFD are derived from the plant nuclear instrumentation system through the AFD Monitor Alarm. A control room recorder continuously displays the auctioneered high flux difference and the target band limits as a function of power level. Ah~ alarm is received any time the auctioneered high flux difference exceeds the target band limits.
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seeena alarm is reeeivea if the Ai!Q e;i;seeas its alleuaale limits fer a eYmYlati*re time ef ene heYr aYrin~ any 24 heYr time fleriea startinl§J Hith the essHrrenee ef the first alarm. Time outside the target band is graphically presented on the strip chart.
Figure B 3/4 2-1 shows a typical monthly target band.
SALEM -
UNIT 2 B 3/4 2-2 Amendment No. 6