ML20094R506

Application for Amends to Licenses DPR-24 & DPR-27 Consisting of Suppl to Change Request 180,modifying 4.16 Kv Degraded voltage,4.16 Kv Loss of Voltage & 480 V Loss of Voltage Protection Functions Setting Limits

ML20094R506
Person / Time
Site:	Point Beach
Issue date:	11/29/1995
From:	Link B WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20094R510	List: ML20094R506 ML20094R513
References
VPNPD-95-100, NUDOCS 9512050002
Download: ML20094R506 (2)

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Wisconsin l Electnc  :

.. POWER COMPANY 231 W Michigart Po Box 2046. Mdwoukee. WI 53201-2046 (414)221 2345 i VPNPD-95-100 10 CFR 50.4-10 CFR 50.90 November 29, 1995 I l

Document Control Desk U.S. NUCLEAR REGULATORY COMMISSION t Mail Station P1-137'  !

Washington, DC 20555 Gentlemen:- $

DOCKETS 50-266 AND 50-301 '

! SUPPLEMENT TO TECHNICAL SPECIFICATIONS CHANGE REOUEST 180 TECHNICAL SPECIFICATIONS SECTION 15.3.5. INSTRUMENTATION SYSTEM, +

4.16KV DEGRADED VOLTAGE, 4.16KV LOSS OF VOLTAGE AND 480 V LOSS OF VOLTAGE PROTECTION FUNCTIONS POINT-BEACH NUCLEAR PLANTS. UNITS 1 AND 2 ,

In a letter dated April 27, 1995, Wisconsin Electric requested amendments,to the Point Beach Nuclear Plant facility operating licenses to modify;the 4.16KV degraded voltage, 4.16KV loss of voltage, and 480,.V loss of_ voltage: protection functions: setting ,

limits.'On September 7, 1995, the NRC issued Information Notice IN 95-37, " Inadequate Offsite Power System Voltages during Design-Basis Events." This Information Notice, in part, states,

' " ... plants'with no upper limit on degraded voltage protection  !

relay setpoints. If these.setpoints are allowed to drift in the upward direction, this trend could also lead to the (same) "

increased potential'for separation from offsite power during design-basis events." l The current and proposed PBNP Technical Specifications Setting  !

( Limits for degraded voltage do not include upper limits. It is our normal practice to minimize the potential for unwanted separation from offsite power by setting the relays as close as practicable to the Technical Specifications setting limit. In recognition of the concerns put forth by IN 95-37, we propose  !

the addition of the following statements to the basis for Technical Specification 15.3.5:  !

.The 4.16KVfdegraded voltage; setting limit is provided as

- greater-than-or-equal-to a value with .ru) upper limit. 1

';The 4.16KV degraded voltage protect *r,a feature is  ;

designed to actuate when at least two of the three associated relays operate for the duration of the time delay. The.4.16KV degraded voltage relays are normally set as close as'possible to the Technical 9512050002 951129 I PDR ADOCK 05000266

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Document Control Desk l November-29, 1995 Page 2 l

Specifications setting limit to minimize, to the extent practicable, the possibility of unnecessary actuation of.

this protection feature. j A copy of the edited Technical Specifications page is: attached. ]

The inclusion of this additional basis information has been reviewed against the original Technical Specifications change -1 Request. The " Safety Evaluation" and "No Significant Hazards >

Evaluation" remain' valid and appropriate for this Technical  :

specifications Change Request with the additional Technical 1 Specifications basis information provided.

Please feel free to contact us if you have any questions.

Sincerely, l

,/l "

, Bob Link Vice President

, Nuclear Power ,

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Attachment (

CAC a

cc: NRC Regional Administrator NRC Resident Inspector t' Public Service Commission of Wisconsin Subscribed and sworn before me on this 244 day of Naa.6et 1995. .

N? %rrmaht: 1 A 0\V U No a(y Public, State of Wisconsin y commission-expires 10 9 6 .-

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