ML20217Q381

Informs NRC of Change to Reactor Stability Long Term Solution from Enhanced Option I-A to Option III for Both Limerick Generating Station & Pbaps,In Response to GL 94-02

ML20217Q381
Person / Time
Site:	Peach Bottom, Limerick
Issue date:	03/02/1998
From:	Geoffrey Edwards PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-94-02, GL-94-2, NUDOCS 9803120231
Download: ML20217Q381 (2)

Text

l GL 94-02 PECO NUCLEAR reco emerov comoeev 965 Cresterbrook Boulevard A Unit of PECO Energy Wayne, PA 19087-5691 March 2,1998 Docket Nos. 50-352 50-353 50-277 50-278 License Nos. NPF-39 NPF-85 DPR-44 DPR-56 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

Limerick Generating Station, Units 1 and 2 Peach Bottom Atomic Power Station, Units 2 and 3 Response to Generic Letter 94-02, "Long Term Solutions and Upgrade of Interim Operating Recommendations for Thermal Hydraulic Instabilities in Boiling Water Reactors"

REFERENCES:

1) Letter, G. A. Hunger, Jr. (PECO Energy) to USNRC dated September 9,1994

2) Letter, G. A. Hunger, Jr. (PECO Energy) to USNRC dated September 30,1996 l

3) Letter, G. A. Hunger, Jr. (PECO Energy) to USNRC dated l

March 19,1997 Gentlemen:

l The purpose of this letter is to inform you of a change to the reactor stability long term solution from Enhanced Option I A to Option lit for both Limerick Generating Station (LGS) and Peach Bottom Atomic Power Station (PBAP3). The Reference 1) letter proposed to implement Enhanced Option 1-A for LGS and PBAPS. Reference 2) and 3) letters provided an updated schedule for implementation of Enhanced Option I-A at LGS and PBAPS, respectively as a result of delivery delays associated with hardware. Recently, however, we reevaluated our options and selected Option lli for implementation at LGS and PBAPS for the reasons described below.

LGS and PBAPS are now being operated on 24-month fuel cycles at 105% of their originally licensed power level. In reviewing recent operating history against the requirements that will be imposed with Enhanced Option I-A, several issues were identified. Normal reactor maneuvering will require greater drops in power and unnecessarily complicate ascensions to full power due to restrictive boiling length criteria. Previous transients that involved recirculation pump runback with reduced feedwater heating would have resulted in undesirable automatic scrams if Enhanced Option I-A had been implemented. Because of reduced operating margins on the power / flow map, recovery actions for transients involving recirculation pump trips become more complicated. To avoid these situations and to simplify operator actions we have decided to install Option ill as follows: I

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March 2,1998 Page 2 Submit LCA Installation Date LGS, Unit 1 4 Q/99 2 Q/00 LGS, Unit 2 4 Q/00 2 Q/01 PBAPS, Unit 2 2 Q/00 4 Q/00 PBAPS, Unit 3 2 Q/99 4 Q/99 The schedule reflects the effora of executive level management to achieve the earliest possible installation dates for Option lli at LGS and PBAPS. The schedule is based on best available hardware delivery dates and assumes a USNRC review period of six months following submittal of a License Change Application (LCA). Installation of Option lli requires the unit to be shutdown ten to fourteen days; therefore, installation is scheduled to be performed during refueling outages.

If you have any questions, please do not hesitate to contact us.

Sin rely, Garrett D. E swards Director- Licensing JLP/bgr cc: H. J. Miller, Administrator, Region I, USNRC A. L. Burritt, Senior Resident inspector, LGS, USNRC A. C. McMurtray, Senior Resident inspector, PBAPS, USNRC l

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