ML13324A645
| ML13324A645 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/08/1985 |
| From: | Haynes J SOUTHERN CALIFORNIA EDISON CO. |
| To: | Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8506030522 | |
| Download: ML13324A645 (2) | |
Text
Southern California Edison Company SAN ONOFRE NUCLEAR GENERATING STATION 111
-1 Ull P.O. BOX 128 SAN CLEMENTE, CALIFORNIA 92672 J. G. HAYNES t..
TELEPHONE STATION MANAGER May 8, 1985 (714) 492-7700 U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:
Mr. J. B. Martin, Regional Administrator
Dear Sir:
Subject:
Docket No. 50-206 Special Report San Onofre Nuclear Generating Station, Unit 1 Pursuant to Section 6.9.3 of Appendix A, Technical Specifications to Provisional Operating License DPR-13 for San Onofre Unit 1, this submittal provides the required 14-Day Special Report for inoperable radiation monitoring instrumentation.
On April 24, 1985, at 1725, with Unit 1 in Mode 1 at 93% power, Stack Wide Range Gaseous Monitor R-1254 was declared inoperable when its mid-range channel was observed responding erratically. The low-range and high-range channels were responding properly. The preplanned alternate method of monitoring was initiated per Limiting Condition for Operation (LCO) 3.5.10, Table 3.5.10-1, Action Statement 27.
Also, in accordance with LCO 3.5.9, Table 3.5.9.1, Action Statement 24, stack flowrate estimates every four hours during planned releases were initiated since the stack flowrate, a function of R-1254, was also declared inoperable.
Subsequent investigation has determined the erratic Mid-Range channel behavior was due to a faulty detector/preamp assembly connector. The detector/preamp assembly has been replaced. Calibration of Monitor R-1254 is still in progress. It is anticipated that Monitor R-1254 will be returned to operable status by May 12, 1985.
8506030522 850508 PDR ADOCK 05000206 S
PDR 706/
MR. J. B. MARTIN
-2 Neither the health and safety of plant personnel nor the health and safety of the public was affected by this event. If you require any additional information, please so advise.
' erely, cc:
F. R. Huey (USNRC Senior Resident Inspector, Units 1, 2 and 3)
A. J. D'Angelo (USNRC Resident Inspector, Unit 1)
U.S. Nuclear Regulatory Commission, Document Control Desk Institute of Nuclear Power Operations (INPO)