ML19256G242
| ML19256G242 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 12/24/1979 |
| From: | PORTLAND GENERAL ELECTRIC CO. |
| To: | |
| Shared Package | |
| ML19256G237 | List: |
| References | |
| TAC-12649, NUDOCS 7912280535 | |
| Download: ML19256G242 (3) | |
Text
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POWER DISTRIBUTION LIMITS SURVEILLANCE REQUIREMENTS (Continued) b) At least once per 31 EFPD, whichever occurs first.
TP WhentheFxhislessthanorequaltotheF limit for 2.
y the appropriate measured core plane, additional power distributionmapsshallbetakenandFhcomparedto x
FRP and F at least once per 31 EFPD.
e.
The F limits for RATED THERMAL POWER within specific core xy planes shall be:
FhP 11.71 for all core planes containing either bank 1.
"D" control rods or any part length rods.
RP 2.
Fx 1.65 for unrodded core planes.
f.
The Fxy limits of e, above, are not applicable in the fol-lowing core plane regions as measured in percent of core height from the bottom of the fuel:
1.
Lower core region from 0 to 15%, inclusive.
2.
Upper core region from 85 to 100% inclusive.
3.
Grid plane regions at 17.8 + 2%, 32.1 + 2%, 47.4 + 2%,
60.6 + 2% and 74.9 + 2%, inclusive.
4.
Core plane regions within + 2% of core height (+ 2.38 inches) about the bank demand position of the bank "D" or part length control rods.
g.
Evaluating the effects of Fxy on F (Z) to determine if F (Z)
Q Q
is within its limit whenever F exceeds F F (z) shall be measured at least once per 31 EFPD.
When Fg(Z) is 4.2.2.3 Q
measured, an overall measured value shall be obtained from a power distribution map and increased by 3% to account for manufacturing tolerances and further increased by 5% to account for measurement uncertainty.
g TROJAN-UNIT 1 3/4 2-6a Amendment No. 30 June 22, 1978 7912280 56
f POWER DISTRIBUTION LItilTS NUCLEARENTHALPYHOTCHANNELFACTOR-F!g LIMITING CONDITION FOR OPERATION 3.2.3 F!g shall be limited by the following relationship:
F!gf1.55[1.0+0.2(1-P)]
where P = THERMAL POWERRATED THERMAL POWER, and APPLICABILITY: MODE 1 ACTION:
WithF$gexceedingitslimit:
a.
Reduce THERMAL POWER to less that 50% of RATED THERMAL POWER within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and reduce the Power Range Neutron Flux-H1gh Trip Setpoints to j 55% of RATED THERMAL POWER within the next 4
- hours, Demonstrate thru in-core mapping that F!g is within its limit b.
within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after exceeding the limit or reduce THERMAL POWEH to less than 5% of RATED THERMAL POWER within the next 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, and c.
Identify and correct the cause of the out of limit condition prior to increasing THERMAL POWER; subsequent POWER OPERATION N
may proceed provided that Fag is demonstrated through in-core mapping to be within its limit at a nominal 50% of RATED THERMAL POWER prior to exceeding this THERMAL POWER, at a nominal 75% of RATED THERMAL POWER prior to exceeding this THERMAL power and within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after attaining 95% or greater RATED THERMAL POWER.
1653 259 TROJAN-UNIT 1 3/4 2-8 Amendment No. 30 June 22, 1979
POWER DISTRIBUTION LIMITS BASES abnormal perturbations in ghe radial power shape, such as from a.
rod misalignment, effect FaH more directly than Fg, b.
although rod anovement has a direct influence upon limiting Fo to wfthin its limits, such control is not readily available to Timit FAH, and c.
errors in prediction for control power shape detected during startup physics tests can be compensated for in Fg by rgstri-ting axial flux distributions.
This compensation for FaH is less readily available.
l The radial peaking factor, F v(Z), is measured periodically to x
provide additional assurance that the heat flux hot channel factor, F (Z), remains within its limit. The Fxy(Z) limits were determined Q
from expected power control maneuvers over the full range of burnup conditions in the core.
TROJAN-UNIT 1 B 3/4 2-5 Amendment No. 30 June 22, 1979 16,53 260