ML19326C221
| ML19326C221 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 07/29/1975 |
| From: | Phillips J ARKANSAS POWER & LIGHT CO. |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19326C222 | List: |
| References | |
| 8101, NUDOCS 8004220798 | |
| Download: ML19326C221 (4) | |
Text
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NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)
CONTROL NO:
8101 FILE:
FROM: Arkansas Power & Light Co.DATE OF DOC DATE REC'D LTR TWX RPT OTHER Little Rock, Ark.
72203 J.D. Phillips 7-29-75 7-30-75 XX TO:
ORIG CC OTHER SENT NRC PDR XX Mr. A. Giambuss 1 signed 39 SENT LOCAL PDR n
". CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
40 50-313 DESCRIPTION: Ler notarized 7-29-75 submitting ENCLOSURES:
proposed revisions to Tech Specs concerning the power / flow / imbalance setpoint envelope with attachment Figures 2.1.2(Core Protectic a
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....n S:afety Limits), 2.3.2(Protective System Maxi num Allowable Setpoints & 3.5.2.3(Operational Po aer Inbalance Envelope).....
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J H ELPIN G BUILO ARKANSAS ARK ANS AS POWER & LIGHT COMPANY 97H & LOulSIAN A STAeeTS
- LITTL AoCK. A AK ANSAS 72203.(5013372-4311 July 29, 1975
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- Mr. A. Giambusso, Director
.j Division of Reactor Licensing
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U. S. Nuclear Regulatory Commission Washington, D. C.
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4< s V Arkansas Nuclear One-Unit 1 P.s Docket No. 50-313 j
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/'{<ys GojA /hgl Technical Specifications
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Dear Mr. Giambusso:
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Attached please find proposed revisions to the Arkansas Nucle g
. o' Unit 1 Technical Specifications concerning the power / flow /imbalan point envelope. He purpose of these Technical Specification revisions is to permit full power operation by increasing the operating margin under the Reactor Protection System (RPS) trip limit.
He presently approved RPS envelope (Figure 2.3-2) was developed using core offset limits established by " worst case"~ peaking throughout core life. He limiting case was the beginning-of-life (BOL) power peaking.
The revised RPS envelope takes credit for fuel depletion in that the revised core offset limits were based on power peaking for burnups greater than 100 EFPD. He first core exposure for ANO-Unit 1 has already exceeded 150 EFPD. The power / flow / imbalance liuits were established as before by incorporating the maximum expected calibration and instrumentation errors to derive the error-adjusted limits. He limits for three and two reactor pump operation were generated using the same process.
Figure 2.1-2 has also been revised to allow for the fuel depletion effects.
Figure 3.5.2-3 has been revised by removing the RPS trip setpoint curve that had previously been added to the operational power imbalance envelope.
He net effect of the change to Figure 2.3-2 is to increase the allowable negative imbalance above 85% power and reduce both the allowable negative and positive imbalances below 85% power for four pump operation. The power to flow ratio of 1.07 does not change nor does the maximum allowable power.
He revised imbalanci setpoints are -14.0% and +10.0% at 107%FP. he set-point slopes are +1.158 and -1.467 for negative and positive power imbal-ances, respectively. H e maximum allowable imbtlances are -33.0% and +25.0%
for power levels below 85% for four pump operation.
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Mr. A. Giambusst r^
July 29, 1975 We have been forced to operate Arkansas Nuclear One-Unit 1 at less than the licensed power due to the restrictions in the present Technical Specifications. De control rod withdrawal limits and rod group overlap produce a negative core imbalance of approximately 5% for power operations above the power level cutoff. Bis negative imbalance combined with normal oscillations in RCS flow, system load conditions and the current trip en-velope results in a reduction in allowable reactor power to prevent frequent tripping of the reactor.
We have been limiting reactor powe. to between 92% and 98%, depending upon reactor conditions, for the past two months to provide adequate operating margins to maintain dependability of the unit.
Using the current system fuel costs, an average 5% reduction in the electrical output from ANO-1 reruits in an increase in generating costs of over $16,000 per day or approximately $500,000 per month.
We request your prompt review and approval of these proposed Technical Spec-ification revisions. We stand ready to meet with you if necessary and to discuss these changes with you to expedite this matter.
Very truly yours, m r e'
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f-t 7.,24 J. D. Phillips '
Senior Vice President JDP:ay Attachment i
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STATE OF ARKANSAS
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SS COUNTY OF PULASKI
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J.'D.
Phillips, being duly sworn, states that he is a Senior Vice
' President of Arkansas Power & Light Company; that he is authori:ed on the part of said Company to sign and file with the Nuclear Regulatory Commission this Supplementary Information; that he.has read all of the statements made and matters set forth therein are true,cnd correct to the best 'of his knowledge, 'information and belief.
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J. D. Phillips SUBSCRIBED AND SWORN 'IO before me, a Notary Public in and for the
'CountyandStateabovenamedthis29 day of b % t_
, 197S.
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fa E.h Notary Public
~bly Commission Expires:
>! arch 1, 1978
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