ML19254D068
| ML19254D068 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/18/1979 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Andognini G BOSTON EDISON CO. |
| References | |
| NUDOCS 7910220315 | |
| Download: ML19254D068 (3) | |
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UNITED STATES y 'Fp r,( ; g NUCLEAR REGULATORY COMMISSION s y {</ j WASHINGTON, D. C 20555 t, P e
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SEPTEMBER 18 TA Docket No. 50-293 Mr. G. Carl Andognini Boston Edison Company M/C NUCLEAR 800 Boylston Street Boston, Massachusetts 02199
Dear Mr. Andognini:
We are currently reviewing the adequacy of the offsite power systems of nuclear power plants and in particular, the loss of offsite power events
' at.vour facility. One aspect of this review concerns the history of experienced total and partial power outages and attendent voltage or frequency conditions of the grid.
In our review of this matter we have drawn upon the information provided to us via Licensee Event Recorts and followup letters which you have sent to us. Our review of these reports indicated the loss of offsite power events have occurred at Pilgrim Unit 1 on April 15,1974, May 24, 1974, May 1,1977, May 10,1977, February 6,1978, January 20,1978 and August 6,1976. To complete our review of loss of offsite power events we require the additional infomation concerning the Pilgrin Unit 1 offsite grid indicated in the enclosure to this letter.
Please provide your response to the attached questions for Pilgrir. Jnit I within 90 days of receipt of this letter.
Sincerely, A
homas n.
, Chief Operating Reactors Branch #3
~
Division of Operating Reactors
Enclosure:
Request for Additional Infomation cc w/ enclosure:
See next page ID 3lb 79N0220 1;
794 067
A* s Mr. G. Carl Andognini SEPTEMBER 1 B G79 cc Mr. Paul J. McGuire Pilgrim Station Acting Manager Boston Edison Company RFD el, Rocky Hill Road Plym'outh, Massachusetts 02360 Anthony Z. Roisman Natural Resources Defense Council 91715th Stree t, N. W. Wasnington, D. C. 20005 Henry Herrmann, Esqui re Massechusetts Wildlife Federation 151 Tremont Straet Boston, itassachusetta 02111 Plymouth Public Library North Street ?lymouth, Massachuseb:s 02360 4 1lj)4 068 O O
s RE0 VEST FOR ADDITION 8' .'N FORMATION A. For losses of offsite power where less than all offsite power was lost: 1. How many circuits to the offsi.te network are normally available end how many were lost during the event? 2. What was the cause of the event? 3. Why did the other lines not fail when some did fail? 4. Was any voltage increase or decrease experier.ced just prior to or during the outage?.If so, please give details, voltagas reached, affects, etc. 5. Was any frequency decay exoerienced just prior to or during the outage? If so, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc. 6. How long was power unavailable from the circuit? 7. Date of Event. B. For losses cf all offsite power: 1. How long was the power off? How long for partial recovery? Please give details. 2. If turbine trip occurred, how soon after di.d loss of offsite power occur? 3. If power was recovered promptly (10 minutes or less), was it due to automati: or manual actions? 4. Was any voltage increase or decrease experienced just prior to or during the outage? If so, please give details,' voltages reached, affects, etc. 5. Was any frequency decay experienced just prior to or during the outage? If sc, please give details, lowest frequency reached, decay rate, affects on equipment operation, etc. 6., Date of Event. C. Were there any other loss of offsite power events other then we have listed? If so, please give details of each event. 1194 069}}