05000361/LER-1982-045, Forwards LER 82-045/03L-0.Detailed Event Analysis Submitted

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Forwards LER 82-045/03L-0.Detailed Event Analysis Submitted
ML20063D785
Person / Time
Site: San Onofre Southern California Edison icon.png
Issue date: 08/20/1982
From: Ray H
SOUTHERN CALIFORNIA EDISON CO.
To: Engelken R
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20063D787 List:
References
NUDOCS 8208300037
Download: ML20063D785 (2)
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LER-1982-045, Forwards LER 82-045/03L-0.Detailed Event Analysis Submitted
Event date:
Report date:
3611982045R00 - NRC Website
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Southern California Edison Compaby ' 22,' y,n, 53 S AN ONOFRE NUCLE AR GENER A TING ST A TION P.O. B O X 128 S AN C LEMENT E C A LIFORNI A 92672 H. 8. R AY Tetee-oNa S.AnO ANA."

August 20, 1982 U. S. Nuclear Regulatory Commission Of fice of inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Walnut Creek, California 94596-5368 Attention:

Mr. R. H. Engelken, Regional Administrator

Dear Sir:

Subject: Docket No. 50-361 30-Day Report Licensee Event Report No.82-045 San Onofre Nuclear Generating Station, Unit 2 This submittal is in accordance with the reporting requirements of Section 6.9.1.13b of Appendix A to Facility Operating License NPF-10.

It describes a reportable condition involving Limiting Condition for Operation (LCO) 3.8.3.1 associated with Onsite Power Distribution Systems. A completed copy of LER 82-045 is enclosed.

While in hbde 4, at 1610 on July 23, 1982, 120 VAC Vital Bus 2Y01 was accidentally de-energized f rom its associated inverter and LCO 3.8.3.1 Action Statement b was initiated.

This Action Statement requires the de-energized bus to be:

(1) re-energized within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least hbde 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in Mode 5 within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />; and (2) re-energized f rom its associated inverter within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or be in at least hbde 3 within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in hbde 5 within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

The bus was re-energized to its alternate power supply, Train A Bus 2B04 within 10 minutes. The bus was re-energized from its associated inverter at 2200 on July 23, 1982, thus fulfilling the requirements of the associated Action Statement.

8208300037 820820 PDR ADOCK 05000361 b' ~ m [J c' S

PDR

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o R. H. Engelken August 20, 1982 The accidental de-energization of the bus is attributed to grounding of tP9 bus caused by disconnection of a jumper which was placed across three fuses on feeder lines to Channel A Plant Protection panel 2LO91.

Jumpers had been placed to avoid de-energization of the bus during replacement of fuses.

Fuse replacement was necessitated by discrepancies between vendor and architect-engineer drawings. An engineering evaluation is currently being undertaken to determine why the discrepancies existed in the drawings.

This event was an isolated occurrence and further corrective action is not deemed necessary.

Normal offsite power was available throughout the event, hence there was no impact on health and safety of plant personnel or the public, 1f there are any questions regarding the above, please contact me.

Sincerely, b

& M6R9

Enclosure:

LER 82-072 cc:

A. E. Chaffee (USNRC Resident inspector San Onofre, Unit 2)

U. S. Nuclear Regulatory Commission Of fice of Inspection and Enforcement U. S. Nuclear Regulatory Commission Office of Management information and Program Control Institute of Nuclear Power Operations

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