05000270/LER-1980-006, Forwards LER 80-006/03L-0

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Forwards LER 80-006/03L-0
ML19330A950
Person / Time
Site: Oconee 
Issue date: 07/25/1980
From: Parker W
DUKE POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML16148A339 List:
References
NUDOCS 8007290824
Download: ML19330A950 (2)
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LER-1980-006, Forwards LER 80-006/03L-0
Event date:
Report date:
2701980006R00 - NRC Website
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text

_

D UKE POWER COMPAN'I Powen 13u Lnixo we SouTu Cnuncu Srazer, CILAHLoTTP., N. C. 2824a wim m o.

.axca.sa.

July 25, 1980 Vicr perstormt TCl,Cpa=ON E; Aa C A 7C4 Seca.e Amoovction 373-4083 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101'Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: Oconee Unit 2 Docket No. 50-270

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-270/80-6. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.b(2), which concerns operation in a degraded mode permitted by a limiting condition for operation, and describes an incident which is con-sidered to be of na significance with respect to plant safety nor to its effect on the health and safety of the public.

Very truly yours,

[.,4[ W

(#

I wM William O. Parker, Jr.

I JLJ:scs l

Attachment-6 cc: Director Mr. Bill Lavallee

.0ffice of Management & Program Analysis Nuclear Safety Analysis Center l

U. S. Nuclear Regulatory Commission P. O. Box 10412 i

Washington, D. C.

20555 Palo Alto, California 94303 I

i t

[002 S

8007149031Y

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o DUKE POWER COMPANY OCONEE UNIT 2 Report Number: R0-270/80-6 Report Date: July 25, 1980 Occurrence Date: June 25, 1980 Facility: Oconee Unit 2, Seneca, South Carolina Identification of Occurrence: Valve 2LP21 Inoperable Conditions Prior to Occurrence: 40% Full Power Description of ges -

nce:

At 1715 on June

.alve 2LP21 failed to open electrically upon command.

The valve was opm.

It was determined that the setscrew on a motor-driven pinion was loose. The problem was corrected.

At 2215 on June 25, the valve passed its performance test and was returned to service.

Apparent Cause of Occurrence:

The exact cause of this failure is difficult to determine. The screw may have been loosened when the motor was removed to facilitate repair on March 15, 1980, or it may have come loose from a combination of vibration and age.

There is also evidence which indicates that there may be an alignment problem with 2LP21's motor pinion assembly due to occurrences in the past.

Analysis of Occurrence:

Operation with one train of the low pressure injection (LPI) system out of service is permitted for up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided the redundant train is operable.

In this particular incident the redundant train was available and the valve was returned to service well within the required 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period permitted by Oconee Nuclear Station Technical Specification 3.3.2.b(2).

However, since tais incident consti-tuted operation in a degraded mode permitted by a limiting condition for operation, it must be reported in accordance with Technical Specification 6.6.2.1.b(2),

although it was concluded that no threat _ to plant safety nor to the health and safety of the public was posed.

Corrective Action

.The immediate corrective action was to use the manual handwheel to open the valve

.and declare the valve inoperable. The loose screw was repaired and the valve returned to service. The operability of the valve was then verified. The LPI valve motors on the other units will be checked for similar deficiencies. This will be-completed as soon as possible, i

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