ML13308B500
| ML13308B500 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/01/1976 |
| From: | Fogarty D SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8103060573 | |
| Download: ML13308B500 (2) | |
Text
Southern California Edison Company C
P. 0. BOX 800 2244 WALNUT GROVE AVENUE DAVID J. FOGARTY ROSEMEAD, CALIFORNIA 91770 TELEPHONE vice PassroENT 213 572 -2796 March 1, 1976 pOCKETED Mr. R. H. Engelken, Director it Region V
'W8 i [6Irj U. S. Nuclear Regulatory Con iAssion Office of Inspection and Enforcementm C.
a Walnut Creek Plaza, Suite 202K 1990 North California Boulevar Walnut Creek, California 94596 Docket No. 50-2b6 San Onofre Unit 1
Dear Mr. Engelken:
An occurrence that is defined in the Environmental Technical Specifications section 5.6.3. (b) as reportable was determined to have happened at the San Onofre Nuclear Generating Station, Unit 1, on February 2, 1976. The purpose of this letter is to give an account of that occurrence.
Specification 3-.1.1.a. (5) of the San Onofre Unit 1 Environmental Technical Specifications establishes, in part, that proper system operation of the two offshore continuous water temperature recording systems be verified once every two weeks. Each of the two continuous temperature recording systems consists of sensing devicesthat record water temperature near the sea surface, midwater and near the bottom.
During a schedule operation verfication check on February 2, 1976, it was discovered that two temperature sensors had malfunctioned for the previous two weeks. The inoperative sensors were at Zone OA system's near bottom and sea surface locations.
New permanent digital temperature monitoring bouy systems (referenced in the November 1974 to July 1975 Semiannual Operat ing Report, Section 3.1) were installed at the two 'specified stations offshore at San Onofre on February 2, 1976)to supersede the existing analog strip chart temperature recorders. This 2336
equipment change was made in an effort to establish a more reliable and efficient data collecting system. The analog system will continue to be used as a backup until reliability is confirmed for the digital.
Very truly yours, cc:
Director, Division of Reactor Licensing Director, Office of Inspection and Enforcement Director, Office of Management Information and Program Control