ML19269E659

Application for Amend to App a of License DPR-34 Changing Tech Specs Re Voltage Sensing Delay

ML19269E659
Person / Time
Site:	Fort Saint Vrain
Issue date:	06/19/1979
From:	Millen C PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML19269E655	List: ML19269E653 ML19269E659
References
NUDOCS 7906290426
Download: ML19269E659 (4)

Text

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i l BEFORE DIE f UNITED STATES NUCLEAR REGULATORY COMMISSION l

I In the Matter of the Facility Operating License)

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of ) Docket Nct. 50-267

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! PUBLIC SERVICE COMPANT OF COLORADO )

, Application for Amendment to j Appendix A of Facility Operating License

', License No. DPR-34 l

OF Tile i

PUBLIC SERVICE COMPANY OF COLORADO FOR THE FORT ST. VRAIN NUCLEAR GENERATING STATIO

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This application for Amendmnt to Appendix A of Facility Operating Licenso, License No. DPR-34, is submitted for NRC review and approval.

Pespectfully subnitted, PUBLIC SERVICE COlFKiY OF COLORADO By '

C. K. Idllen, Senior Vice President KELLY, STANSFIELD & 0'DOIIELL Bryant O'Donnel Robert E. Thompson Public Service Corgany Building Denver, Colorado 80202 Attorneys for Applicant 2147 106 7 906290 %2g <

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s STATE OF COLORADO )

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CITY A'ID COV.iTY OF DE!!VER)

C. K. Millen, being first duly sworn, deposes and says; That he is Senior Vice President of Operations of Public Service Company of Colorado, the Licensee herein; that he has read the forogoing Application for Amendment to Appendix A of Facility Operating License and knows the contents thereof, and that the statements and matters set forth therein tire true and correct to the best of his knowledge, information and belief.

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C. K. Millon Subscribed and sworn to before me this M day of June,1979.

Witness my hand and official seal.

Ify conmission expires - ) r, ! , <

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Notary Public 2147 107

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e ATTACHMENT 1 6

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1) Revise note d) of Specification LCO 4.4.1, Notes for Tables 4.4-1 through 4.4-4 as follows:

d) Both 480 volt buses lA and 1C loss of voltage for no longer than 35 seconds.

2) Revise item 14a, Method of Table 5.4-1, Specification SR 5.4-1, as follows:

14a) Method: Trip each channel by applying simulated loss of voltage sig-nal.

Reason for Chances 1) and 2):

A 22% decrease in voltage on each of the 4160 volt buses will open the breakers feeding the corresponding 480 volt buses. Therefore, the 480 volt essential bus undervoltage relays will either have sufficient voltage to operate properly or zero voltage, which provides the signal necessary to initiate an automatic scram within the required time frame. Thereft.a it is incorrect to specify a loss of voltage setpoint in the LOO or the SR method of test. The voltage sensing re-lays do not incorporate a mechanism for adjusting the drop out point, and none is necessary.

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