05000361/LER-1982-037, Forwards LER 82-037/03L-0.Detailed Event Analysis Submitted

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Forwards LER 82-037/03L-0.Detailed Event Analysis Submitted
ML20071L153
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 07/23/1982
From: Ray H
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20071L156 List:
References
NUDOCS 8208020350
Download: ML20071L153 (2)


LER-2082-037, Forwards LER 82-037/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3612082037R00 - NRC Website

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Office of Inspection and Enforcement

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Attention: Mr. R. H. Engelken, Regional Administrator *

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Dear Sir:

Subject:

Docket No. 50-361 30-Day Report Licensee Event Report No.82-037 San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H.B. Ray (SCE) to R.H. Engelken (NRC), dated July 2, 1982 s

, The referenced letter confirmed our prompt notification of your office ,

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of our failure to provide Licensee Event Reports (LER's) within.,30 days

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the dates upon which the event had occurred, ,

'Pu'rsuant to Technical Specification 6.9.1.13.b, this stibmittal provides the required 30 day vitten report and Licensee Event Report (LER) of an

' event involving Limiting Condition for Operation (LCO) 3.3.3.5'.

During startup testing, the remote shutdown monitoring reactor coolant boron concentration instrument (Boronometer)' listed in Technical Specifi-cations Table 3.3-9 had been intermittently erratic. Accordingly, upon initial entry into Mode 3 on May 18,1982, the Boronometer was declared inoperable and Action statement 3.3.3.5.a was entered. This Action statement requires that the inoperable instrument be restored to operable status within seven days.

The problem was determined to be a design error in that the transmitter module included an extra ground, causing a " ground loop" and the erratic indication. A Startup Problem Report was written and a temporary modifi- ',

cation was installed to eliminate this erratic indication. A Proposed Facility Change has been initiated to incorporate this temporary modifi '

cation as a permanent design change. .

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' Mr. R. H. Engelken July 23,1982 Had an accident occurred requiring evacuation of the Control Room while the remote shutdown monitoring boronometer was inoperable, the reactor coolant System boron concentration could only have been determined by sampling. Since there is no decay heat in the core, there was no effect on public health and safety.

Should you require additional information concerning this incident, please contact me.

Sincerely, yntAF n 009 Enclosure (LER 82-037) cc: U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Office of Management Information and Program Control Institute of Nuclear Power Operations (INP0)

A.E. Chaffee (USNRC Resident Inspector, San Onofre, Unit 1)

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