ML20010H917

Forwards LER 81-013/03L-0.Detailed Event Analysis Encl

ML20010H917
Person / Time
Site:	Oconee
Issue date:	09/14/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010H918	List: ML20010H917 ML20010H922
References
NUDOCS 8109290410
Download: ML20010H917 (2)

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DUKE POWER COMPMY' Powc*t DUILDING 422 SouTu Chaucu Srner.T, CILAHIDTTE, N. C. 28242 wituAu o. eAnnen.an.

Scr PngsierNT 7tttNON(! AREA 7Q4 s,c.. Paeouctio. Septenber 14, 1981 373-.o e s

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- ,s Mr. James P. O'Reilly, Director \[ /3 g .

U. S. Nuclear Regulatory Commission o An "

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Region Il "1 101 Msrietta Street, Suite 3100 C !887 Atlanta, Georgia 30303 V, .gA; Nt

/,. p Re: Oconee Nuclear Station 4- s\V Docket No. 50-270 ' TON '

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-270/81-14. 'this report is submitted pursuant to Oconee Nuclear Station Technical Specifica-tion 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 considered to be of no significance with respect to its effect on the health and safety of the public.

Very truly yours, A t -

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e- LD. 's William O. Parker, Jr.

JFK/php Attachment cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U. S. Nuclear Regulatory Commission P. O. Box 10412 Washington, D. C. 20555 Palo Alto, California 94303 Mr. F. Jape Resident Inspector-NRC Oconee Nuclear Station h0s tll s

8109290410 910914 PDR ADOCK 05000270 S PDR.

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DUKE POWER COMPANY l l OCONEE UNIT 2 l REPORT NUM ER: RO-270/31-13 REPORT DATE: September 14, 1981 OCCURRENCE DATE: August 15, 1981 FACILITY: Oconee Nuclear Station, Unit 2, Seneca, South Carolina IDENTIFICATION OF OCCURRENCE: "2A" Reactor Ruilding Spray Pump Declared Inoperable as a Result of Empty 011 Reservoir CONDITIONS PRIOR TO OCCURRENCE: 100% Full Pcwer DESCRIPTION OF OCCURRENCE: At 1645 hours0.019 days <br />0.457 hours <br />0.00272 weeks <br />6.259225e-4 months <br /> on August 15, 1981, the ZA Reactor Building Spray (RBS) pump was discovered to have an oil leak on a bearing oil reservoir (bubbler). The pump was declared inoperable and removed from ser-vice. The oil leak was repaired and the pump was returned to service.

This constitutes operation in a degraded mode permitted by Technical Specifi-cation 3.3.6.c(2)(a) and is thus reportable pursuant to Technical Specification 6.6.2.1 b(2).

APPARENT CAUSE OF OCCURRENCE: The pump was declared inoperable as a result of the low oil level in the reservoir. The oil in the reservoir had leaked out due to loose piping from the reservoir to the " bearing slinger housing." It is not known how the piping became loose.

ANALYSIS OF OCCURRENCE: The low oil level in the reservoir was discovered during a routine operational check. The pump was not damaged as a result of the leak since the pump was not running during the period that the oil level was low.

During the period that the "2A" RBS pump was inoperable the redundant RBS pump was operable. Additionally, the three Reactor Building Cooling Units were also operable. It has been shown for the worst case design basis loss of coolant accident (a 14.1 ft 2hot leg break) that the Reactor Building design pressure will not be exceeded with one RBS pump and 2 R.B. coolers operable. Thus, this incident is considered to be of no significance with respect to safe operation and the health and safety of the public were not affected.

CORRECTIVE ACTION: To correct the oil leakage, the piping from the bubbler to the " bearing slinger housing" was removed, inspected and reinstalleu.

The reservoir was refilled with oil and the pump was returned to service.

The pump was observed for approximately 30 minutes after the repair to assure no oil leaks remained.

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