ML20155K589

Proposed Tech Specs Reducing Heat Flux Hot Channel Factor from 2.237 to 2.15 to Obtain Addl Peak Clad Temp Margin in Support of Reduced Min Injected Upper Head Injection Water Vol

ML20155K589
Person / Time
Site:	Sequoyah
Issue date:	10/25/1988
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20155K582	List: ML20155K578 ML20155K589
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 Fq (Z) shall be limited by the following relationships:

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 Fq (Z) exceeding its limit:

/

a. Reduce THERMAL POWER at least 1% for each 1,% F (Z) exceeds the limit 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 K4 ) have been reduced at least 1% (in AT span) for each 1% Fq (Z) 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 Fq (Z) is demonstrated through incore mapping to be within

'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 P

ADOCK 05000327 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

a. Using the movable incore detectors to obtain a power distribu-tion map at any THERMAL POWER greater than 5% of RATED THERMAL POWER.

b.

Increasing the measured QF (z) component of the power distribution 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 F

q (z) f, x Mz) for P > 0.5 g

N 2.237 F

Q (z) < W(z) x 0.5x q for P < 0.5 -

R23 where F"(z) is the measured Fq (z) increased by the allowances for manufacturing tolerances and measurement uncertainty,q F limit is

, the Fq limit, K(z) is given in Figure 3.2-2, P is the relative ,

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 Fq (z) was last determined,* or

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

1. F "(z) shall be increased by 2 percent over that specified in q

4.2.2.2.c or

2. F q N(z) shall be measured at least once per 7 effective full power days until 2 successive maps indicate that maximum FM (*)

is not increasing. R23 over z K(z) j f.

,s, With the relationships specified in 4.2.2.2.c above not being satisfled:

,. 1.

Calculate expression:

the percent qF (z) exceeds it' limit by the following 1 .e -

M maximum _q F (z) x W(z) -1 x 100 over z for P > 0.5 2.23 M i ,

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:

a. Place the core in an equilibrium condition where the 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 percentAF (z) exceeded its limit.

or Foohod [ b.

Comply with the requirements of Specification 3.2.2 for F9 (z) exceeding its limit by the percent calculated above.

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 Th e Ilmit shall be 2.15 instead'of 2.237 until an' analysis in conformance 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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