05000361/LER-1982-120, Forwards LER 82-120/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-120/03L-0.Detailed Event Analysis Submitted

ML20065T252
Person / Time
Site:	San Onofre
Issue date:	10/21/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20065T254	List: 05000361/LER-1982-120, Forwards LER 82-120/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-120-03, /03L-0:on 820921,turbine electro-hydraulic Control Valves 2UV-2200 C & G Failed to Close Following Turbine Trip During Turbine Generator Excitation Testing.Caused by Mechanical Binding Between Valve Spindle & Bushing
References
NUDOCS 8211020288
Download: ML20065T252 (2)

LER-1982-120, Forwards LER 82-120/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982120R00 - NRC Website

text

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$ AN C LEME N T E. C A LIF OR NI A 92672 H. 8. R A Y YELEPHONE October 21, 1982 om mmo ir.1 ON A AOf.

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.82-120 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.

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describes a reportable occurrence involving Limiting Condition for Operation l

(LCO) 3.3.4 associated with the Turbine Overspeed Protection System (TOPS).

A completed copy of LER 82-120 is enclosed.

While in Mode 1, on September 21, 1982, turbine generator excitation testing in accordance with Startup Procedure 2PA-430-02 was in progress.

Due to failure of turbine control valves 2UV-2200C and G to close fully following l

a turbine trip, these valves were declared inoperable at 1913 and LCO 3.3.4 l

Action Statement a was invoked. As required by this Action Statement, the l

turbine stop valves were verified shut, isolating the turbine from the steam l

supply.

The inability of the valves to close fully was investigated and the l

problem was identified as mechanical binding between valve spindle and spindle bushings. After replacement of the valve spindle and spindle bushings, the valves were declared operable in accordance with S023-3-3.34 at 1050 on October 14, 1982. This was an isolated event and no other corrective action is warranted.

8211020288 821021 PDR ADOCK 05000361 S

PDR B&

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8':2-No9

Mr. R. H. Engelken October 21, 1982 Since the turbine remained isolated from the steam supply throughout the event, there was no impact on health and safety of plant personnel or the public.

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

Sincerely, d

Enclosure:

LER 82-120 cc:

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

U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement i

U. S. Nuclear Regulatory Commission Office of Management Information & Program Control Insititue of Nuclear Power Operations (INPO)

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