ML19312C849
| ML19312C849 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 08/26/1975 |
| From: | Parker W DUKE POWER CO. |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19312C850 | List: |
| References | |
| NUDOCS 8001130003 | |
| Download: ML19312C849 (4) | |
Text
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NRC DISTRIBUTION FOR PART 50 DOCKET MATERI AL (TEMPORARY FORM)
CONTROL NO: T/ d FILE:
FROM: Duke Pcwer Company DATE OF DOC DATE REC'D LTR TWX RPT OTHER Charlotte, NC 8-26-75 8-28-75 XX ur neuer TO:
ORIG CC OTHER SENT NRC PDR XX XX Mr Boyd none signed SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
XXX 1
M287 DESCRIPTION:
ENCLOSURES:
Ltr trans the following:
Proposed andt to OL/ change to tech specs:
consisting of revisions to tech specs with regard to safety limits for reactor thermal power and' power imbalance conbinaticn and ggggg to flux-flow and power-imbalance trip set-p ints...(40 cys enc 1 rec'd)
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2EGULATORY DOCKKr FILE COPY Mr. Roger S. Boyd, Acting Director Division of Reactor Licensing U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Re: Oconee Nuclear Station Docket Nos. 50-270, -287
Dear Mr. Boyd:
This letter constitutes Duke Power Company's application for revision of the Oconee Nuclear Station Technical Specifications, pursuant to 10CFR50, 550.90. The proposed revision pertains to Oconee Units 2 and 3 and modifies (i) the safety limits for the reactor thermal power and power imbalance combination and (ii) the Reactor Protection System (RPS) flux-flow and power-imbalance trip setpoints.
The existing core safety limits and RPS envelopes were developed using core offset limits established by the " worst case peaking" that may occur throughout core life, including beginning-of-life power peaking.
The beginning-of-life power peaks, however, decrease with fuel burnup.
Because both Unit 2 and Unit 3 have attained core burnups beyond 100 EFPD, the core offset limits have been reevaluated taking into account the reduction in the beginning-of-life power peaks.
The proposed power-imbalance core safety limits take into account a burnup of 100 EFPD
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for each of the units, and the proposed RPS power-imbalance trip
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setpoints are based on a more restrictive out-of-core to incore g,
offset correlation than the one used in generating the existing RPS power-imbalance trip setpoints.
$3 Q f, Maximum thermal power for three-pump operation has been changed from C
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86.0% FP to 86.'% FP in order that application of error adjustment
[ ", g factors be consistent with other B&W units.
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5 The proposed revision in imbalance limits necessitates a reduction of ig i -
the flux / flow ratio from 1.07 to 0.961 for single loop operation in order to provide adequate margin from the revised imbalance safety limits.
Attached are replacement pages 2.1-3b, 2.1-8, 2.1-9, 2.3-1, 2.3-2, 2.3-3, 2.5-4, 2.3-9, 2.3-10, 2.3-12, and 2.3-13 of the Oconee Nuclear 91U
Mr. Roger S. Boyd Page 2 August 26, 1975 Station Technical Specifications. Proposed changes are identified by vertical lines in the margin of the replacement pages.
l Timely approval of this proposed revision is requested.
Forty copies of this request, including three signed originals, are enclosed.
Very truly yours, s/ William O. Parker, Jr.
William 0. Parker, Jr.
PMA:vr Enclosures i
~~
Mr. Roger S. Boyd Paga 3 August 26, 1975 WILLIAM 0. PARRER, JR., being duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of said Company to sign and file with the Nuclear Regulatory Commission this request for amendment of the Oconee Nuclear Station Technical Specifications, Appendix A to Facility Operating Licenses DPR-38, DPR-47 and DPR-55; and that all statements and matters set forth therein are true and correct to the best of his knowledge, s/ William O. Parker, Jr.
William O. Parker, Jr., Vice President ATTEST:
s/ John C. Goodman, Jr.
John C. Goodman, Jr.
Assistant Secretary Subscribed and sworn to before me this 26th day of August, 1975.
s/Edna B. Farrar Notary Public My Commission Expires:
October 24, 1977