05000361/LER-1982-040, Forwards LER 82-040/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-040/03L-0.Detailed Event Analysis Submitted

ML20063D893
Person / Time
Site:	San Onofre
Issue date:	08/18/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20063D896	List: 05000361/LER-1982-040, Forwards LER 82-040/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-040-03, /03L-0:on 820719,control Room Emergency Chiller E-335 Tripped on High Bearing Temp.Caused by Faulty High Temp Bearing Alarm Module.Module Replaced
References
NUDOCS 8208300071
Download: ML20063D893 (2)

LER-1982-040, Forwards LER 82-040/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982040R00 - NRC Website

text

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DECEiy5g Southern California Edison Company 152 !.!! 23 yy,

G SAN ONOFRE NUCLE AR feENER ATING ST A TION P.o. som 12e [h!j s AN cLEMENTE. C AL8FORNI A 92472 TELEPMONE STOT ION M AN AG E R August 18, 1982 1

k U. S. Nuclear Regulatory Commission Office 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.82-040 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) 3.7.3 associated with the Component Cooling Water System (CCW).

A completed copy of LER 82-040 is enclosed.

While in Mode 3, on July 19, 1982, control room emergency chiller E-335 tripped on high bearing temperature. After restarting and tripping again, the chiller was declared inoperable at 1600.

Inoperability of E-335 renders all equipment located in rooms where ambient air would be cooled by this system (in the event of an accident with loss of offsite power) Inoperable. Several equally restrictive LCO's govern plant operation in this situation. We consider CCW LCO 3.7.3 to be governing since this system was in continuous operation throughout the chiller failure.

Subsequent investigation into the cause of this occurrence indicated a f aulty high temperature bearing alarm module. This module was replaced.

The chiller and all associated equipment were declared operable at 2300 on July 23, 1982. This was within the LCO Action Statement requirements 1

i and Mode 5 cooldown was not required.

8200300071 820818

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.PDR ADOCK 05000361 3Qe I

S PDR 02-200 '

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August 18,'1982

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R. H. Engalken There _was no significant impact 'on' plant. operations or the. health and safety of plant personnel or the public as a result of this occurrence,=

since-normal HVAC was operating;throughout the event (no loss of AC

. power)..

lf there are any questions 'regarding the above, please contact. me.

j Sincerely,

.)f

/

f I

Enclosure:

LER 82-040 cc:

U. S. Nuclear Regulatory Commission Of fice of Inspection and Enforcement U. S. Nuclear Regulatory Commission Of fice of Management;lnformation and Program Control i

institute of Nuclear Power Operations i

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

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