ML023540281

10 CFR50.46 Annual Report for 2002

ML023540281
Person / Time
Site:	Vermont Yankee
Issue date:	12/17/2002
From:	Sen G Entergy Nuclear Operations, Entergy Nuclear Vermont Yankee
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
BVY 02-99
Download: ML023540281 (4)

Text

Entergy Nuclear Vermont Yankee, LLC Entergy Nuclear Operations, Inc.

- Entergy 185 Old Ferry Road Brattleboro, VT 05302-0500 December 17, 2002 BVY 02-99 United States Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

References:

(a) Letter, VYNPS to USNRC, "IOCFR50.46 (a) (3) (ii) Report of Changes to Calculated Peak Clad Temperature," BVY 02-91, dated November 18, 2002 (b) Report, 0000-0006-1823-SRLR, Rev. 0, "Supplemental Reload Licensing Report For Vermont Yankee Nuclear Power Station, Reload 22 Cycle 23," dated October 2002 (c) Letter, S.A. Richards (USNRC) to J.F. Klapproth (GE), "Review of NEDE-23785P, Volume III, Supplement 1, Revision 1, GESTR-LOCA and SAFER Models for Evaluation of Loss of Coolant Accident, Volume IIl, Supplement 1, Additional Information for Upper Bound PCT Calculation," dated February 2002

Subject:

Vermont Yankee Nuclear Power Station License No. DPR-28 (Docket No. 50-271) 10CFR50.46(a)(3)(ii) Annual Report for 2002 This letter is to report, in accordance with IOCFR50.46(a)(3)(ii), changes in peak cladding temperature (PCT) for the Vermont Yankee (VY) Emergency Core Cooling System (ECCS) Loss of Coolant Accident (LOCA) analysis. This annual report covers Cycle 22 from January to October 2002 and Cycle 23 from October to December 2002.

VY recently completed a refueling outage and has begun operation with GE-14 fuel type. The three previous reloads used GE-13 and GE-9 fuel types. The licensing basis Peak Clad Temperature (PCT) calculated for GE-14 fuel is 1950'F and was reported in Reference (a). For Cycle 23, VY used the General Electric (GE) SAFER/GESTR methodology for the evaluation of the ECCS/LOCA. The results of the analysis are summarized in Reference (b). The GE methodology has been approved by the NRC in Reference (c).

The following table, from Reference (b), provides the annual summary of GE reported changes or errors identified in the methodology for all VY fuel types.

BVY 02-99 / Page 2 Summary of 10CFR50.46 Errors for Vermont Yankee Licensing Basis APCT (fF)

IOCFR50.46 IOCFR50.46 Error Identification Error Description GE.14t GE-13 GE-9NB Error in the shell outside diameter value of the steam separator in the SAFER basedeck for 2000-01 Revision I Vermont Yankee and time step error impact N/A -12 -12 (Error 2000-01 includes error 2000-04)

Error in accounting for the steam condensed 2001-01 when subcooled ECCS liquid is injected into N/A 0 0 the lower plenum Inconsistency in the vessel pressure rate 2001-02 equation N/A +10 +10 2002-01 Error in core spray injection elevation N/A +5 +5 Impact of SAFER Bulk Water Level Error oil 2002-02 the Peak Clad Temperature N/A +5 +5 Total APCT (0 F) N/A +8 +8 Original Licensing Basis PCT Adjusted Licensing Basis PCT The errors summarized are not applied to the GE-14 since this fuel type was recently introduced at VY and the calculated licensing basis PCT addressed all these errors.

BVY 02-99 / Page 3 Since the PCTs for GE-14, GE-13 and GE-9 fuel types are well within the acceptance criterion of IOCFR50.46(b)(1), there is no need for reanalysis or other action per IOCFR50.46(a)(3)(ii). All other IOCFR50.46(b) criteria are met for these fuiel types as well.

If you have any questions concerning this letter, please contact Mr. Jim DeVincentis at (802) 258-4236.

Sincerely, Gautam Sen Manager, Licensing cc: USNRC Region I Administrator USNRC Resident Inspector USNRC Project Manager Vermont Department of Public Service

SUMMARY

OF VERMONT YANKEE COMMITMENTS BVY NO.: 02-99 10CFR50.46(a)(3)(ii) Annual Report for 2002 The following table identifies commitments made in this document by Vermont Yankee.

Any other actions discussed in the submittal represent intended or planned actions by Vermont Yankee. The), are described to the NRC for the NRC's information and are not regulator, commitments. Please notify the Licensing Manager of any questions regarding this document or any associated commitments.

COMMITMENT COMMITTED DATE OR "OUTAGE" None N/A i

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