ML20209D388

Suppl Application for Amends to Licenses NPF-11 & NPF-18, Changing Proposed Degradation Voltage Low Limit Setpoint & Adding High Limit Setpoint & Allowable,Per 981109 Application

ML20209D388
Person / Time
Site:	LaSalle
Issue date:	07/07/1999
From:	Jamie Benjamin COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20209D390	List: ML20209D388 ML20209D393
References
NUDOCS 9907130126
Download: ML20209D388 (3)

Text

l Commonw calth hhson (,on.pany I

,- 12 Nile Gencrating Ntation 2601 North 21st Road

. Wrwilks. IL 61.4 419'%*'

Tcl H I 4.4574761 COI1tEd  !

4 July 7,1999 I

United States Nuclear Regulatory Commission l Attention: Document Control Desk I Washington, D.C. 20555 l

LaSalle County Station, Units 1 and 2 Facility Operating License Nos. NPF-11 and NPF-18 l NRC Docket Nos. 50-373 and 50-374

Subject:

Supplement to Application for Amendment to Appendix A, I Technical Specifications to Facility Operating Licenses Change to the Technical Specification Requirements for the 4.16 kV Emergency Bus Undervoltage (Degraded Voltage) Emergency Core Cooling System Actuation Instrumentation Setpoints.

Reference:

F. R. Dacimo (Comed) letter dated November 9,1998, to USNRC transmitting Proposed Change to the Technical Specification Requirements for the 4.16 kV Emergency Bus Undervoltage (Degraded Voltage) Emergency Core Cooling System Actuation Instrumentation Setpoints.

This supplement proposes to change the proposed degraded voltage low limit setpoint and to add a high limit setooint and allowable value. The addition of the high limit setpoint and allowable value was discussed during the May 27,1999 1 conference call with the NRC staff.

The sotpoint calculation took into account the instrument reset band and instrument uncertainties to determine the high limit for the allowable value and /) I the maximum reset voltage of the degraded voltage relays. The block start  !

calculations assure that reset will occur at a voltage below the offsite minimum steady state voltages, such that the degraded voltage trip will not occur when the preferred offsite voltages are within the expected operating range. .

Oh 9907130126 990707 N i PDR ADOCK 05000373 P PDR {

A Unicum t.ompan> l l

July 7,1999 U.S. Nucl::ar R:gulatory Commission  ;

P ge,2 l l

l The degraded voltage setpoint submitted by Reference (1) is being changed to reflect the setpoint tolerance that was used in the setpoint calculation.

The previously submitted setpoint was the nominal value, and did not include the setting tolerance used in the setpoint calculation. This corrects the low limit of the setpoint. The low limit for the allowable value is not affected.

in addition to the Technical Specification changes, changes to the Technical Specification Bases are also included, which are consistent with the design bases presented in the above Reference.

The original Significant Hazards Consideration, that was included in the Reference 1 submittal, remains valid.

Comed requests approval of this amendment request prior to the start of the next refueling outage for Unit 1, L1R08, which is scheduled to start October 23,1999. Implementation will be prior to startup from L1R08 for Unit 1 and prior to startup from the next Unit 2 refueling outage, L2R08, which is scheduled to start November 18,2000.

The attachment to this letter contains the marked up License / Technical Specification pages for LaSalle Units 1 and 2 with the requested changes indicated.

i I

This proposed change has been reviewed by the Plant Operations Review Committee and the Nuclear Safety Review Board in accordance with the Quality Assurance Program.

l Comed is notifying the State of Illinois of this supplement to the application for amendment by transmitting a copy of this letter and its attachment to the designated state official.

l Should you have any questions conceming this letter, please contact Frank A. Spangenberg, Ill, Regulatory Assurance Manager, at (815) 357-6761, extension 2383.

Respectfully, a

ffr . enjamin Site Vice President LaSalle County Station cc: Regional Administrator- NRC Region ill i NRC Senior Resident Inspector - LaSalle County Station

July 7,1999 U.S. Nucle r R:gulitory Commission Pzge 3 STATE OF ILLINOIS )

l COUNTY OF LA SALLE )

IN THE MATTER OF )

COMMONWEALTH EDISON COMPANY )

LASALLE COUNTY STATION - UNIT i ) Docket No. 50-373

Subject:

_ Supplement to Application for Amendment to Appendix A, Technical Specifications to Facility Operating Licenses Change to the Technical Specification Requirements for the 4.16 kV Emergency Bus Undervoltage (Degraded Voltage) Emergency Ccre Cooling System Actuation Instrumentation Setpoints. ,

AFFIDAVIT l affirm that the content of this transmittal is true and correct to the  ;

best of my knowledge,information and belief.

)

qd L A LL f578de*[

LaSalle County Station I l

Subscribed and swom to before me, No ry Public in and for the Stptelboys named, this / day of

/ ddI// . /V99'. My Commission expires on v

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! 0FFICIAL SEAL LYNN ELLEN GASSMAN NOTARY PUBUC, STATE OF ILUN01S

MY COMMISS10N EXPIRES 1-24 2001 y ,

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