ML20006E000

Proposed Tech Specs,Adding Page 2-57 to Support Cycle 13 Operation

ML20006E000
Person / Time
Site:	Fort Calhoun
Issue date:	02/06/1990
From:	OMAHA PUBLIC POWER DISTRICT
To:
Shared Package
ML20006D972	List: ML20006D971 ML20006D998 ML20006E000
References
NUDOCS 9002150370
Download: ML20006E000 (3)

Text

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.IMITING CONDITIONS FOR OPERATION-

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2.10'lteactor core (continued)-

I 2.10.4= Power Distribution Limits (Continued).

(b)- If while operating under the provisions of part (a), the plant computer incore detector alarms become inoperable,-

-operation may be continued for seven days from the date.

of the last valid core power distribution without reducing c power provided each of the following conditions .is satisfied:

4 (1) A core power distribution was.obtained utilizing incore detectors within 7 days prior to the incore i

' detector alarm _ outage and the measured peak linear heat rate was no greater than 90% of the value

. allowed by (1) above.

(ii) The Axial Shape Index'as measured by excore detectors a remains within t.05 of the value obtained at the time of the last measured incere power distribution.--- '

(iii) Power is not increased- nor has it been increased since the time of:the last incore power distribution. ,

.(c) When the linear heat rate is continuously ponitored by the-excore detectors, withdraw the full length CEA's beyond -

the.long term insertion limits of Specification 2.10.2.7

• and maintain the Axial Shape Index,.Y 7

, with the limits of Figure 2-6. If'the linear heat rate is exceeding its limits

'as determined.by the Axial Shape Index, Yt ,- being outside the limits of Figure 2-6, where 100 percent of the allowable power expression:-

represents'the maximum power allowed by the following t

L o,

WE x M

. las .tg

• where.

1.- L is the maximum allowable linear heat rate as determined.from Figure 2-5 and is based on the core average burnu

-incore power map. p at the time of the latest

2. M is the maximum allowable fraction of rated thermal power as. determined by the F T limit curve of Figure 2-9 when monitoring $ excore detectors. M = 1 when monitoring kw/ft using incore detectors.

(1) Restore the reactor power and Axial Shape Index, Y to within the limits of Figure 2-6 within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />,y,r o 2-57 AmendmentNo.I,28,32,#3,#7,1'f / L PDC

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.n TABLE 8-1(cont.) '

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c, , Exolanation for Cvele 13 Technical Soecification Chances Item. . Tech. Spec.

.jhtu Pace /Fiaure No. ~Chanae Reasons J 7 Page 2-57a Change " vale" to "value" Correction of a typographi-in 2.10.4(3) paragraph 1, cal error.

line 1.

8 Page 1-2  : Add "(Fx T "on para- Administrative changes to graph 3,yli )ne 4, following define unrodded planar

• the words " total unrodded radial peak and update USAR planar radial peak". references. Reference (1)

Also change Reference (1) currently corresponds to from USAR Section "3.6.7" USAR Section 3.6.6 and i to "3.6.6" and delete Reference (3) is now the Reference (3)inthe- same as Reference (1).

. " References". As a result,.

change "less than 1.18 (3)"

to "less than 1.18 (1)" in paragraph 4, line 10.

9 Page 2-57 Change the denominator value The allowable peak linear in the expression contained heat rate in Figure 2-5 has inSection2.10.4(C)to been reduced from 15.5 14.4. kw/ft to 14.4 kw/ft.- The 14.4 kw/ft value is conser-vative with respect to the previous value.

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., Description of Amendment Request to Reduce the Allowable Peak Linear Heat Rate

vs.'Burnup Kw/ft Limit The-proposed' Technical Specification change in Table B-1 corresponding-to Items 3 and 9;for Technical S)ecification Figure 2-5 and Page 2-57 concerns the reduction of the allowa)le peak linear heat rate (PLHR) vs. burnup from 15.22 Kw/ft.to 14.4 Kw/ft To bound the allowable fuel mechanical design parameters, an end of cycle reduction in the allowable PLHR was required. By reducing the allowable PLHR to 14.4 Kw/ft the internal fuel pin pressure at end of cycle will remain less than the 1960 psia system pressure utilized in the current LOCA analysis. The

. use of a 14.4 Kw/ft limit is conservative with respect to the previous 15.22 Kw/ft limit.

Basis ~for No Sionificant Hazards Determination:

This proposed amendment does not involve a significant hazards consideration because the operation of Fort Calhoun Station in accordance with this amendment '

would not:

1) Involve a significant increase in the arobability or consequences of an accident previously evaluated. This c1ange maintains the validity of.

the fuel mechanical design evaluation for the Combustion Engineering i fuel assemblies. The use of the reduced PLHR will prevent the internal pressure in the fuel pins from exceeding the LOCA evaluated value by increasing the operating margin in the fuel-pin design. On the basis of the technical safety evaluation, operating with the gain in margin for.

Cycle 13 for the allowable PLHR vs. burnup would be no more limiting than operating with the Cycle 12 PLHR vs. burnup requirements.-

Therefore, this change does not increase the probability or consequences of a previously evaluated accident.

2) Create the possibility of a new or different kind of accident from any accident previously evaluated. It has been determined that a new or different type of accident is not created because no new or different modes of operation are proposed for the plant. The continued use of the same Technical Specification administrative controls prevents the possibility of a new or different kind of accident.

3) Involve a significant reduction =in a margin of safety. Administrative specifications involving the allowable PLHR vs. burnup ensure that operating with the additional margin gained from the Kw/ft allowable limit conforms to current plant conditions and, therefore, preserves the margin of safety.

- Based on the above considerations, OPPD does not believe-that.this proposed amendment involves a significant hazards consideration as defined by 10CFR50.92 and the )roposed changes will not result in a condition which significantly

- alters t1e impact of the Station on the environment. Thus, the proposed change '

meets the eligibility criteria for categorical exclusion set forth in 10CFR51.22(e)(9) and pursuant to 10CFR51.22(b) no environmental assessment need be prepared.

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