ML20155K589
| ML20155K589 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/25/1988 |
| From: | TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20155K582 | List: |
| References | |
| NUDOCS 8811010308 | |
| Download: ML20155K589 (4) | |
Text
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d.
4 7,
POWER DISTRIBUTION LIMITS 3/4.2.2 HEATFLUXHOTCHANNELFACTOR-Fg s
LIMITING CONDITION FOR OPERATION 3.2.2 F (Z) shall be limited by the following relationships:
q F(Z)1[2.23d(K(Z)]forP>0.5 0
P F(Z)1[2.237i(K(ZI]forP10.5 9
0.5 THERMAL POWER where P =
RATED THERMAL POWER and K(Z) is the function obtained from Figure 3.2-2 for a given core height location.
APPLICABILITY: MODE 1 R23 ACTION:
With F (Z) exceeding its limit:
q
' /
Reduce THERMAL POWER at least 1% for each 1,% F (Z) exceeds the limit a.
9
)
within 15 minutes and similarly reduce the Power Range Neutron Flux-High Trip Setpoints within the next 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />; POWER OPERATION may proceed for up to a total of 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; subsequent POWER OPERATION may proceed provided the Overpower Delta T Trip Setpoints (value of K ) have been reduced at least 1% (in AT span) for each 1% F (Z) 4 q
exceeds the limit, b.
Identify and correct.the cause of the out of limit condition prior to increasing THERMAL POWER; THERMAL POWER may then be increased provided F (Z) is demonstrated through incore mapping to be within q
'its limit.
SURVEILLANCE REQUIREMENTS 4.2.2.1 The provisions of Specification 4.0.4 are not applicable.
fookolt W December 22, 1982 SEQUOYAH - UNIT 1 3/4 2-5
-Amendment-% 49 8911010308 881025 PDR ADOCK 05000327 P
PDC i
POWER DISTRIBUTION LIMITS SURVEILLANCE REQUIREMENTS (Continued)
~ _ _ _.
4.2.2.2 F (z) shall be evaluated to determine if F (Z) is within its limit by: q 9
Using the movable incore detectors to obtain a power distribu-a.
tion map at any THERMAL POWER greater than 5% of RATED THERMAL POWER.
b.
Increasing the measured F (z) component of the power distribution Q
map by 3 percent to account for manufacturing tolerancas and further increasing the value by 5% to account for measurement uncertainties.
c.
Satisfying the following relationship:
M 3
q (z) f, x Mz) for P > 0.5 F
g N
2.237 Q (z) < W(z) x 0.5x q for P < 0.5 F
R23 where F"(z) is the measured F (z) increased by the allowances for q
manufacturing tolerances and measurement uncertainty, F limit is q
the F limit, K(z) is given in Figure 3.2-2, P is the relative q
THERMAL POWER,and W(z) is the cycle dependent function that 4
accounts for power distribution transients encountered during normal operation. This function is given in the Peaking Factor Limit Report as per Specification 6.9.1.14.
M d.
Measuring Fq (z) according to the following schedule:
1.
Upon achieving equilibrium conditions after exceeding by 10 percent or more of RATED THERMAL POWER, the THERMAL POWER at which F (z) was last determined,* or q
2.
At least once per 31 effective full power days, whichever occurs first.
"During power escalation at the beginning of each cycle, power level may be increased until a powar level for extended operation has been achieved and a power distribution map obtained.
Insed Fo.s.4 W----+
herv 2 3,- !"S3-SEQUOYAH - UNIT 1 3/4 2-6
- = de+nt '^. M
^
l
- J POWER DISTRIBUTION LIMITS
(
Y SURVEILLANCE REQUIREMENTS (Continuu e.
With measurements indicatin
(
M maximum '
Fg (z)
I over z
(
K(z) has increased since the previous determinatin of F M(z) either of the following actions shall be taken:
9
"(z) shall be increased by 2 percent over that specified in 1.
Fq 4.2.2.2.c or N(z) shall be measured at least once per 7 effective full 2.
Fq power days until 2 successive maps indicate that maximum FM (*)
is not increasing.
R23 over z K(z) j f.
With the relationships specified in 4.2.2.2.c above not being
,s, satisfled:
1.
Calculate the percent F (z) exceeds it' limit by the following expression:
q 1
.e M
F_q (z) x W(z) maximum
-1 x 100 for P > 0.5 i over z 2.23 M l
x K(z)
[
M maximum Fn (z) x W(z)
-1 x 100 for P < 0.5 joverz 7 237*x K(z) q
.)
2.
Either of the following actions shall be taken:
Place the core in an equilibrium condition where the a.
limit in 4.2.2.2.c is satisfied. Power level may then be increased provided the AFD limits of Figure 3.2-1 are
. Tone el-reduceo 1% AFD for each percent F (z) exceeded its limit.
or A
Foohod [
b.
Comply with the requirements of Specification 3.2.2 for F (z) exceeding its limit by the percent calculated above.
9 SEQUOYAH - UNIT 1 w :'- : D-HM-3/4 2-7
',cnc::at b.
1^-
p.
r
.5 :..
Footnote "A" to be Inserted on Pages i
3/4 2-5 3/4 2-6 3/4 2-7.
M e Ilmit shall be 2.15 instead'of 2.237 until an' analysis in conformance Th with:10 CFR 50.46, using plant operating conditions and showing that a
'11mit of 2.237 satisf.les the requirements of 10 CFR 50.46(b), has been completed and submitted to NRC.
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