ML20053C159

Application for Amend to License DPR-62,revising Tech Specs to Begin Fuel Cycle 5 Reload Operation

ML20053C159
Person / Time
Site:	Brunswick
Issue date:	05/20/1982
From:	Howe P CAROLINA POWER & LIGHT CO.
To:	Vassallo D Office of Nuclear Reactor Regulation
Shared Package
ML20053C160	List: ML20053C159 ML20053C164 ML20053C174 ML20053C186
References
NUDOCS 8206010535
Download: ML20053C159 (4)

Text

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3 Carohna Power & .ight Company MM 2 01952 9

Office of Nuclear Reactor Regulation ATTN: Mr. D. B. Vassallo, Chief Operating Reactors Branch No. 2 United States Nuclear Regulatory Commission Washington, D.C. 20555 BRUNSWICK STEAM ELECTRIC PLANT, UNIT NO. 2 l

DOCKET NO. 50-324 LICENSE NO. DPR-62 FUEL CYCLE NO. 5 - RELOAD LICENSING

SUMMARY

In accordance with the Code of Federal Regulations, Title 10, Part 50 90 and Part 2.101, Carolina Power & Light Company (CP&L) hereby requests revisions to the Technical Specifications (TS) for the Brunswick Steam Electric Plant (BSEP), Unit No. 2. These revisions are necessary to begin Cycle 5 operation. Changes to the TS are indicated by vertical lines in the right-hand margins of the affected pages which are attached.

DISCUSSION Forty (40) copies each of General Electric's (GE) reports Y1003J01A37, Revision 1, March 1982, " Supplemental Reload Licensing Submittal for Brunswick Steam Electric Plant, Unit 2, Reload 4," (with recirculation pump trip (RPT)) and Y1003J01A37, March, 1982," Supplemental Reload Licensing Submittal for Brunswick Steam Electric Plant, Unit 2, Reload 4," (without RPT) are attached to this letter.

By the attached letter dated May 6, 1982, CP&L has been notified by GE that a minor error exists in the current version of the ODYN transient computer code which was used for performing the BSEP Unit No. 2, Cycle 5, l analysis of pressurization transients. GE stated in their letter that the corrected version of ODYN would be expected to result in an increase of 0.01 in the Cycle 5 minimum critical power ratio (MCPR) operating limits for ODYN -

analyzed events with RPT. The Cycle 5 non-RPT MCPR operating limits for ODYN - analyzed events would be expected to increase by 0.02.

CP&L has compensated for the above errors by adding the expected increases in MCPR limits to the results of the ODYN analyzed transients.

1 These corrections are reflected in the enclosed TS changes. However, upon receipt and examination of the corrected results from GE (scheduled for July 1, 1982), should the enclosed TS changes need revision, we will promptly notify NRC and proceed with a revised submittal.

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e Brunswick Unit No. 2 is presently scheduled to start up on June 29, 1982. We request that the Staff review be conducted to support issuance of the TS revisions in time to allow return to power in accordance with this schedule. We will keep your staff apprised of any changes to the schedule.

ADMINISTRATIVE INFORMATION In accordance with 10CFR 170.12(c), we have determined that this request constitutes a Class III amendment as it involves a single technical issue. Our check for $4,000 is enclosed as payment for this amendment fee.

Should you have any questions concerning this submittal, please contact our staff.

Yours very truly,

'N-P. W. Howe Vice President Technical Services MSG /1r (n-56) cc: Mr. J. P. O'Reilly (NRC-RII)

Mr. J. Van Vliet (NRC)

P. W. Howe, having been first duly sworn, did depose and say that the information contained herein is true and correct to his own personal knowledge or based upon information and belief.

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GENER AL h ELECTRIC AND SERVICES ,

GENERAL ELECTRIC COMPANY,175 CURTNER AVE., SAN JOSE, CALIFORNIA 95125 DIVISION May 6, 1982 cc: J. H. Craven GRH:82-041 C. R. Diet:

R. A. Hanvelt R. E. Helme L. H. Martin /R. G. Matthews J( A. McQueen J. L. Rash J. P. Rea E. B. Wilson W. A. Zarbis Mr. J. D. Martin Fuel Department CAROLINA POWER & LIGHT COMPANY P. O. Box 1551 Raleigh, NC 27602

SUBJECT:

Brunswick 2 Reload 4 (Cvele 5) Reload Licensing Analysis Error - ODYN Transient Code hEFERENCES: 1. " Supplemental Reload Licensing Submittal for Brunswick Steam Electric Plant Unit 2, Reload 4", Y1003J01 A37, Revision 1, March 1982. [With RPT]

2. " Supplemental Reload Licensing Submittal for Brunswick Steam Electric Plant Unit 2, Reload 4", Y1003J01A37, March 1982. [Without RPT]

Dear Jack:

This will confirm our May 4, 1982 telephone conversation.

GE has discovered a minor error in the current version of the ODYN transient computer code which was used for perfor=ing Brunswick 2 Reload 4 (Cycle 5) transient analyses. Results of these analyses were reported in the reference Brunswick 2 Reload 4 RPT and non-RPT reload licensing submittal documents. While the accuracy of the current ver-sion of ODYN is within the range of transient model uncertainty, a cor-rected version has been developed, and will be used in future reload licensing analyses. Use of the corrected version of ODYN would be expected to result in an increase of 0.01 in the Cycle 5 RPT MCPR opera-i ting limits for ODYN-analyzed events (Reference 1). The Cycle 5 non-RPT l

MCPR operating limits for ODYN-analyzed events (Reference 2) would be expected to increase by 0.02. REDY-analyzed transients, such as the Loss of Feedwater Heater, and other events, such as Bundle Loading Error

e GENER AL @ ELECTRIC Mr. J. D. Martin May 6, 1982 and Rod Withdrawal Error, are not affected by this ODYN error. The Brunswick 2 Reload 4 (Cycle 5) ODYN-analyzed limiting transients will be reanalyzed by the corrected version of ODYN. The corrected MCPR opera-ting limits will be provided to CP&L in the fcrm of Errata and Addenda sheets to the reference license submittal documents by July 1, 1982.

The current ODYN version was developed in 1981 for improved com-patibility with automated design methods. The NRC was notified in ,

October, 1981 that GE intended to use this version in reload licensing analyses, and the code was put into production in late 1981. As part of this notification, the NRC was infor=ed that the new version predicted peak heat fluxes up to 2.1% less than the original program that the NRC had reviewed in detail (15 in peak heat flux ::0.01 in ACPR). Recently, it was discovered that the axial power distribution calculation in the current version was incorrectly programmed, and that this error accounted for most of the difference in licensing calculation results from the original version.

GE believes that this error does not constitute a reportable condi-tion under 10CFR21 because the error was reflected in our model qualifi-cation statements to the NRC in October, 1981, and becausa the magnitude of the error is well within the NRC recognized uncertainty of ODYN.

However, we are correcting this problem for both past :nd future licen-sing analyses.

A number of plants, in addition to Brunswick 2 Reload 4, are also affected by this ODYN error. The NRC was called on May 5, 1982 to inform them of the correction to the ODYN code and of our plans to issue corrected results to the affected customers by July 1, 1982. I will keep you informed if the NRC indicates any additional actions are required.

We recognize that this error will result in inconvenience to CP&L.

For that, we offer our sincere apologies.

Very truly yours, G. R. Hull Fuel Project Manager Brunswick 1/2 M/C 174; (408) 925-6176 rem