ML19317D214

Requests Proposed Changes to Cycle 3 Tech Specs Limits Including Mod to Pump Monitor Trip Setpoint & Deletion of Surveillance Requirements for Measuring RCS Flow.Forwards Proposed Tech Specs 2.3 & 4.1-2

ML19317D214
Person / Time
Site:	Oconee
Issue date:	09/14/1977
From:	Parker W DUKE POWER CO.
To:	Case E Office of Nuclear Reactor Regulation
Shared Package
ML19317D215	List: ML19317D214 ML19317D218
References
NUDOCS 7911190605
Download: ML19317D214 (4)

Text

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l Ltr notarized 9-14-77.........trans the License //DPR-38/47/55 Amend: Td.: Specs following: proposed change concerning revisions to pump monitor trip setpoint & deletion of surveillance requirem.nts for measuring reactor ccolant system flow......'.......

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- Powsm Buu.ntxo 42n SocTa Caracu StazzT, CaAntorrz, N. C. asa4a num o. ..n cn. s n. September 14, 1977 VsCE PettsCEm? ItLta=cest: AmCA 7C4 Secaw peoowcwon 373 4ces 3

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RE: Oconee Units 1, 2 and 3 l- ..

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Docket Nos. 50-269, -270 and -287 ,

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Dear Mr. Case:

By letter of March 30, 1977, we submitted proposed Technical Specifica-tions changes and supporting reload report applicable to Oconee 1 Cycle

4. As you are aware, the DNBR limited Technical Specification limits Of Oconee 1 Cycle 4 were established by incorporating a certain margin for the rod bow DNBR penalty. The amount of this DNBR margin was estab-lished using the rod bow magnitude predicted by the B&W rod bow model (rod bow (mils) = 11.5 + 0.069v'burnup). Recent discussions with the NRC staff, however, indicated that the staff review of the B&W rod bow model has not yet been completed, and therefore a rod bow DNBR margin equal to that resulting from the NRC intcrim model would have to be provided.

I In the case of Oconee 1 Cycle 4, only the flux / flow trip setpoint does i not include the DNBR margin required by the NRC interim model. To pro-vide the necessary DNBR margin, it is proposed to set the pump monitor trip function to trip the reactor upon loss of one pump during four-pump l

j operation if the indicated reactor power.is greater than 80%FP.

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The existing pump monitor trip function is set to trip the reactor upon l

loss of two pumps, and as such the analysis basis for the existing flux /

l flow trip setpoint in a two-pump coastdown. By changing the pump monitor i

setpoint to trip on the indicated loss of one pump, the flux / flow trip setpoint analysis need only to consider a one-pump coastdown. The pro-l posed change provides DNBR margins of 40% for Oconee 1, 34% for Oconee 2, and 32% for Oconee 3.

In the case of Oconee 2 Cycle 3 and Oconee 3 Cycle 3, the necessary DNBR margins for the flux / flow trip setpoints were demonstrated by taking credit for additional RC flow available over the thermal-hydraulic design flow. Because of the pump monitor trip on loss of one peop, these flow credits are not required.

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Mr. Edchn G. Czco, Ac41ag Dircctor -O

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S:ptembsr 14, 1977 '

Pago Two Pursuant to 10CTR 550.90, the attached proposed changes to Oconee 1

< Cycle 4, Oconee 2 Cycle 3 and Oconee 3 Cycle 3 Technical Specifications limits are requested. These revisiens include the proposed modification for the pump monitor trip setpoint and delete the surveillance require-ment for measuring reactor coolant system flow.

Very truly yours,,

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j William O. Parker, Jr.

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1 Attachment .

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3 a September 14, 1977 Page 3 WILLIAM 0. PARIGR, JR., being duly sworn, states that he is Vice President of Duke Power Company; that he is authorized on the part of saic' Company to sign and file with the Nuclear Regulatory Commission this request for amendment of the Oconee Nuclear Station 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.

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William O. Parker, Jr. 7Vice President Subscribed and sworn to before me this 14th day of September, 1977.

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Notary Public My Commission Expires:

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