ML19256E354
| ML19256E354 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/17/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7911020215 | |
| Download: ML19256E354 (3) | |
Text
k, TErLk
[c.="se, v
'o, UNITED STATES
!w NUCLEAR REGULATORY COMMISSION 3, QU; i j WASHINGTON, D. C. 20555
=,
/
October 17, 1979 Dockets Nos. 50-317 and 50-318 Mr. A. E. Lundvall Vice President - Supply Baltimore Gas & Electric Company P. O. Box 1475 Ealtir. ore, fbryland 21203
Dear t'r. Lundvall:
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 your facilities.
One aspect of this review concerns the history of
-excerienced tetal and partial power outages and attendent degraded 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 Reports and followup letters which you have sent to us. Our review of these reports indicate that loss of offsite puwer events have occurred at Calvert Cliffs Units 1 and 2 on May 13 & 21,1976, December 14, 1976, January 8,1977, April 11 & 13,1978.
In order to complete our review of loss of offsite power events we require additional information.
This information should be provided to us in the form of answers to the questions listed in the enclosure.
Please provide your response to the enclosed questiens for the Calvert Cliffs fiuclear Power Plant Units !!os.1 and 2 to !!RC within 90 days of the receipt of this letter.
Sincerely,
&WL Ap Robert W. Reid, Chief Operating Reactors Eranch #4 Division of Operating P.eactors E :losure:
k n.est of Additional Infor ation cc w/ enclosure:
- ee,ec case 1259 285 7911020
e 4,
s Baltinore Gas & Electric Company cc:
Janes A. Biddison, Jr.
Mr. R. M. Douglass, Manager General Counsel Quality Assurance Department G and E Building Room 923 Gas & Electric Building Charles Center P. O. Box 1475 Bal timore, Maryland 212C3 Baltimore, Maryland 21203 George F. Trowbridge, Esquire Shaw, Pittnan, Potts and Trowbridge 1800 M Street, N.U.
Washington, D. C.
20036 Mr. R. C... Olson Baltinore las and Electric Company Room 922 - G and E Buil ding Post Of fice Box 1475 Baltimore, Maryland 21203 Mr. Leon B. Russell, Chief Engineer Calvert Cliffs Huclear Power Plant Baltinore Gas and Electric Company Lusoy, Maryl and 20657 Bechtel Power Corporation ATTil:
Mr. J. C. Judd Chief Nuclear Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20760 Combustion Engineering, Inc.
ATTH:
Mr. P. W. Kruse, Manager Engineering Services Post Office Box 500 Windsor, Connecticut 06095 Calvert County Library Prince Frederick, Maryland 20678 1259 286
s ENCLOSURE PROPOSED OUESTIONS FOR LOSS OF OFF SITE SURVEY A.
For lesses of offsite pcwer where less than all effsite power was lost:
1.
How many circuits to the offsita network are r.:-mally available and 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 di: fail?
Was any. voltage increase or decrease experiet;ed just prior to or during 4.
the outage? 'If so, please give details, vel: ages reached, affects, etc.
5.
Was any frecuency decay experienced just pric- :o er during the outage?
If so, please give details, lowest frequency etche:, cecay rate, affects on equipment operation, etc.
6.
How long was power unavailable from the circui:?
7.
Date of Even*..
5.
For lesses of 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 did less cf offsite power occur?
3.
If power was recovered promptly (10 minutes or less), was it oue to automatic or manual actions?
4.
Was any voltage increase or decrease experienced jdst prior to or durino
. the. outage? If so, please give details,' vcitages reached, affects, etc.
5.
Was any frequency decay experienced just prior to or during the outage?
If so, please give details, lowest frequency reached, decay rate, affects on ecJipment operation, etC.
5.
Cate of Event.
Were :r.ere any other icss cf cffsite pcwer eve.:s ::r.er :har. we have listed?
~
- s:, : lease give :sta-1s :f ea r, event.
1259 287 D
' 3
' k[liil D**D aJ
.A
.co_
.