ML13316B771
| ML13316B771 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/28/1980 |
| From: | Ottoson H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| IEB-80-15, NUDOCS 8010080283 | |
| Download: ML13316B771 (3) | |
Text
Southern California Edison Company P.O (BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD, CALIFORNIA 91770 August 28, 1980 U. S. Nuclear Regulatory Commission Office of Insoection and Enforcement Region V 1990 North California Boulevard Suite 202, Walnut Creek Plaza Walnut Creek, California 94596 Attention:
Mr. R. H. Engelken, Director DOCKET No. 50-206 SAN ONOFRE - UNIT 1
Dear Sir:
IE BULLETIN 80-15 POSSIBLE LOSS OF EMERGENCY NOTIFICATION SYSTEM (ENS)
WITH LOSS OF OFFSITE POWER Reference is made to your correspondence of June 18, 1980 forwarding the subject IE Bulletin. Identified thereih were inquiries concerning the possible loss of communication with the NRC Operations Center via the Emergency Notification System (ENS) upon loss of offsite power.
Responses to individual items are listed below in the order given in the Bulletin:
ITEM 1:
Within 10 days of the date of this Bulletin, verify by direct inspection in conjunction with the appropriate telephone company representative, that the ENS at your facility is.powered in the manner described in the two enclosures.
RESPONSE
It was determined that the ENS at San Onofre was powered on-site (110-120v. 60 cycle) and not powered by the local phone company as reported in enclosure 1. This was brought to the attention of the NRC by the ENS telephone system on June 26, 1980.
8010080
U. S. Nuclear Regulatory Commission August 28, 1980 IE Bulletin 80-15 Page -2 ITEM 2:
Those facilities which have station packages requiring on-site power, but which are not connected to a safeguards Instrumentation bus which is backed up by batteries and an inverter or equally reliable power supply, shall make necessary mooifications and provice such a connection.
RESPONSE
Power for the ENS has been changed to an existing batterv/inverter circuit for the station internal telephone S/sem. The system consists of an Exide 48v calcium wet call battery bank and a Lorian inverter (Model WBA10281)
,hich provide 200 amp-hrs. of service. This translates to a useful charge or greater than 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />. The batteries are charged by a Ratelco battery charger (Model 2570) which s cowered on-site. Normally, devices connecteo to this circuit receive power from the on-site source which also charges the batteries. If offsite power is lost, the batter/inverter automatically provides back-up power for a cerloo of approximately 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />.
The ENS was connected to this battery/inverter circuit on August 14, 1980.
ITEM 3:
All facilities are to develop and conduct a test, within 60 days of the issuance of this Bulletin, to verify that all extensions of e ENS located at your facility(ies) woulo remain fully opersole from the facility(ies) to the NRC Operations Center in on-vnt of a loss of offsite power to your facility(ies).
mis is nct intended to mean that an actual loss of offsite power be executed.
RESPONSE
On Auqust 28, 1980 at 10:30 a.m., offsite power to the communications battery/inverter was disconnected. The ENS was then operationally tested and found to be working properly on the batter backup. After the test, power was restored to the system.
ITEM 4:
If it is determined that a station package requiring on-site power is not connected to a safeguards instrumentation bus
.acked up by automatic transfer to batteries and an inverter or an ecually reliable power supply, notify the NRC Operations Center via the ENS within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after such determination.
RESPONSE
On June 26, 1980 in a telephone conversation with J. R.
Tate, Supervisor of Plant Operations, the NRC was informed that the ENS at San Onofre was powered on-site and had no back-up power supply.
U. S. Nuclear Regulatory.Commission August 28, 1980 IE Bulletin 80-15 Page #3 ITEM 5:
Prepare and issue an administrative procedure or directive which requires notification to the NRC Operations Center by commercial telephone or relayed message within one hour of the time that one or more extensions of the ENS located at your facility(ies) is subsequently found to be inoperable for any reason.
RESPONSE
The applicable station procedure has been modified by adding the following: "Notify the NRC Operations Center as soon as possible and in all cases within one hour by commercial telephone or relayed message if one or more extensions of the ENS (i.e. Red Telephone) are found inoperative for any reason."
ITEM 6:
Provide a written report, within 75 days of the issuance of this Eulletin, describing the result of the reviews required by items I ano 2 above, the results of the testing required by item 3 and the procedures required by item 5.
RESPONSE
This letter constitutes our response to this item.
Shoula you have any questions on the above, please contact me.
Sincerely, H. L. Ottoson Manager of Nuclear Operations cc:
Director, Office of Inspection and Enforcement Division of Reactor Operations Inspection