ML19291C219

From kanterella
Jump to navigation Jump to search
Advises of Delay in Completion of Voltage Study Re Station Svc Bus Voltage Conditions.Results of Study & Proposed Tech Specs Associated W/New Undervoltage Relays on Class IE 4160-volt & 480-volt Buses to Be Completed by 800215
ML19291C219
Person / Time
Site: Beaver Valley
Issue date: 01/17/1980
From: Dunn C
DUQUESNE LIGHT CO.
To: Schwencer A
Office of Nuclear Reactor Regulation
References
TAC-10007, NUDOCS 8001230148
Download: ML19291C219 (1)


Text

'Af (412) 456-6000 435 S.sta Avena 9 ftsburgi Ps 152t9 January 17, 1980 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn: A. Schwencer, Chief Operating Reactors Branch No. 1 Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334 Station Service Bus Voltage Study Gentlemen:

In our October 15, 1979, response to requests for information on station service bus voltages, we indicated computer analyses were being performed to determine the station service bus voltage conditions that might exist during the relatively short periods of time required to start accelerate to running speeds various combinations of motor driven station equipment. The completion of this voltage study has been delayed, but we expect to complete '.t by February 15, 1980, at which time we will submit the results of the :, dy and proposed Technical Specifications aserciated with the new undervoltage relays on the Class lE 4160 volt and 480 volt buses.

We plan to complete the installation of the new undervoltage relays and the corrective measures for the undervoltage condition during the current major modification and refueling outage. We anticipate the corrective measures for the undervoltage will be in the form of capacitors connected to the normal, non-safety related, 4160 volt station service buses. Should we determine that these capacitors must be connected to these buses to prevent the occurrence of degrated voltage conditions en the safety related buses for periods of time that could result in damage to essential safety related equipment, we will provide proposed limiting conditions for operation related to these capacitors.

Very truly yours, C. N. Dunn Vice President, Operations 1792 018 A 'f f

80 012 3014 e