ML19323F014
| ML19323F014 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/18/1980 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR NUDOCS 8005280371 | |
| Download: ML19323F014 (3) | |
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UNITED STATES
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April 18,1980 Docket No. 50-245 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
We are continuing our review of your August 1,1977 submittal concerning degraded grid voltage for Millstone Unit 1, which responded to our letter dated June 2, 1977. We have concluded that the following information is required to continue our review.
1.
A second level of undervoltage protection has been installed on the non Class lE 345 KV system. The function of these undervoltage re-lays is to protect the emergency equipment on the Class lE buses.
IEEE Standard 279-1971 requires protective channels to be Class 1E.
Describe how flillstone Unit 1 can meet IEEE Standard 279-1971.
2.
Staff position requires that the load shedding feature be automat-ically reinstated if the onsite source supply breakers are tripped.
Describe how f1111 stone Unit 1 can meet this requirement. flanual load shedding is not acceptable.
3.
Staff position 1-C-2, states that the time delay shall prevent spurious trips from the offsite (preferred) power.
Show how a one second time delay on degraded voltage will be long enough to prevent a trip upon startup of a large emergency pump.
4 Staff position 1-d requires that "...the voltage monitors shall auto-matically initiate the disconnection of offsite power whenever..." a degraded voltage exists for the established time delay.
What equip-ment is powered from the Class lE bus and is in service during normal operations? Describe how Millstone 1 can meet this requirement.
5.
Staff positions 1-3 require certain Technical Specifications. These Technical Specifications should include values for the trip setpoints of voltage and time delay, provide the required coincidence logic, provide action statements when the number of operable channels for degraded voltage protection is reduced, provide the surveillance re-quirements for channel calibration and functional tests, and provide the requirements to demonstrate the sequence of Class lE bus de-ener-gization, load shedding, voltage restoration, and load sequencing after a degraded voltage signal.
You are requested to submit the proposed Technical Specification changes to cover these required items.
8005280371
.m M r.."a'. G. Counsil April 18,1980 These cuestions were telecopied to you on March 26, 1980 so that your response could te submitted by April 26, 1980.
Sincerely, V
Dennis L. Ziemann, Chief Operating Reactors Branch #2 i
Divisien of Operating Reactors cc:
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Mr.',:. 3. Ccur.sii April 18, 1980 Williar. H. Cud:y, Esquire Connecticut Energy Agency Day, Eerry & Meward ATTN: Assistant Director Ccur.sslers at Law Research and Policy One C:ns:1: :i:n Plaza Devel opment Hartf:rd, Ccnr.sc:icut C5103' Department of Planning and Energy Policy Anthery Z. P.ciscan 20 Grand Street Natural Rescur:es Defense Coun:11 Hartford, Connecticut 06106 917 15:h Street, N. W.
Washington, ~;.. C.
20005 Director, Technical Assessment Division Ncrtheast Nuclear Energy Company Office of Radiation Programs ATIN: Superin:e : dent (AW-459)
Miiis:ene Plant U. S. Environmental Protection P. O. Box 125 Agency Waterford, C:enecticut 05355 Crystal Mall #2 Arlington, Virginia 20460
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