05000361/LER-1982-128, Forwards LER 82-128/03L-0.Detailed Event Analysis Submitted

Forwards LER 82-128/03L-0.Detailed Event Analysis Submitted

ML20069P168
Person / Time
Site:	San Onofre
Issue date:	11/18/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20069P170	List: 05000361/LER-1982-128, Forwards LER 82-128/03L-0.Detailed Event Analysis Submitted 05000361/LER-1982-128-03, /03L-0:on 821021,while in Mode 2,control Element Assembly Slipped & Dropped in Excess of 7 Inches.Caused by Slow Operation of Grippers.Gripper Actuation Voltage & Duration of Application Increased.Sys Tested Successfully
References
NUDOCS 8212070383
Download: ML20069P168 (2)

LER-1982-128, Forwards LER 82-128/03L-0.Detailed Event Analysis Submitted

Event date:
Report date:
3611982128R00 - NRC Website

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0. S. Nuclear Regulatory Commission Office of Inspection and Enforcement I[C s

Region V 1450 Maria Lane, Suite 210

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Attention:

Mr. R. H. Engelken, Regional Administrator k1

Dear Sir:

N Subject: Docket No. 50-361 30-Day Report

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Licensee Event Report No. 82-12&

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San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H. B. Ray (SCE) to R. H. Engelken '(NRC),

i dated August 31, 1982 Licensee Event Report No.82-084, 82-086,82-088, 82-091 and 02-092.

Pursuant to Section 6.9.1.13b of Appendix A, Technical Specifications to Operatir.g License NPF-10, for San Onofre Unit 2, this submittal provides the required 30-day written report and copy of Licensee Event Report (LER) for an occurrence involving the Control Element Assembly (CEA).

Limiting Condition for Operation (LCO) 3.1.3.1 requires that while in Modes 1 and 2 all CEA's which are inserted in the core shall be operable with each CEA of a given group positioned within 7 inches (indicated po;ition) of all other CEA's in its group.

21,1982, at 0315 with the plant in Mode 2, while attempting On October reactor startup CEA 57 (Group 4) slipped from approximately 133 inches to 100 inches violating LC0 3.1.3.1.

Action Statement 3.1.3.1.C.1 allows operation to continue in Modes 1 and 2 provided that within one hour the misalig'1ed CEA is restored to operable This was achieved status within its specified alignment requ.rements.

within 10 minutes by manually lowering the remaining rods in Group 4 to 100 inches, using Procedure 5023-3-5.8.

In addition, shutdown margin was verified. This satisfactorily fulfilled the Action Statement and reactor startup was resumed at 0325.

LER 82-128 addresses this event.

8212070383 821118 PDR ADOCK 05000361 S

PDR 3 21 82-Hf

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e R. H. Engelken November 18, 1982 The cause of the slippage was found to be slow operation of the grippers which prevented one of the grippers (upper or lower) from making up to the CEA prior to the other gripper releasing. The corrective action taken was similar to that described in the referenced letter (i.e.,

increase in the gripper actuation voltage and duration of fi.s application).

The CEA was tested successfully and returned to service. No other problems have been experienced and no further corrective action is planned.

This event had no effect on public health and safety since it did not affect the ability of the CEA to be inserted into the core, when required.

If there are any questions, please contact me.

Sincerely, Hf>Q/nu%

Enclosure: LER 82-128 cc:

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

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