05000269/LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

ML20063H959
Person / Time
Site:	Oconee
Issue date:	08/20/1982
From:	Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20063H961	List: 05000269/LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl 05000269/LER-1982-011-03, /03L-0:on 820622,while Testing to Verify Unit Operability,Unit Would Not Close Into Sys Grid Via Keowee to 230-kV Switchyard Tie Breaker (ACB-1).Caused by Leaking Float Valve in Turbine Governor Control Sys
References
NUDOCS 8209020223
Download: ML20063H959 (2)

LER-1982-011, Forwards LER 82-011/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2691982011R00 - NRC Website

text

!

e.

?

' DuxE POWER Gomwxy l'.O. IsoX 311f50 CHAHIAFTTE, N.C. 2ft242 IIAJ. II. Tt1KER mEssume

== raramm (yo.g) aya~g33:

Augunt 20, 1982 mm. r

.m Mr. James P. O'Reilly, Regional Administrator y

l; U. S. Nuclear Regulatory Commission Region II Q

b' 101 Marietta Street, Suite 3100 g

~

O

. f'-

Atlanta, Georgia 30303 s:

p Re: Oconce Nuclear Station g

y Docket No. 50-269 t

Dear Mr. O'Reilly:

6 Please find attached Reportable Occurrence Report R0-269/82-11. This report is submitted pursuant to Oconce 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 considered to be of no significance with respect to its effect on the health and safety of the public. Letter of Mr. William O. Parker, Jr. dated July 22, 1982 addressed the delay in preparation of this report.

Very truly yours, W

s Hal B. Tucker JFK/php Attachment cc: Document Control Desk Mr. W. T. Orders U. S. Nuclear Regulatory Commission NRC Resident Inspector Washington, D. C. 20555 Oconce Nuclear Station Records Center Mr. Philip C. Wagner Institute of Nuclear Power Operations Office of Nuclear Reactor Regulation 1820 Water Place U. S. Nuclear Regulatory Commission l

Atlanta, Georgia 30339 Washington, D. C. 20555

. OFFICI AI, COPY B20902d223 82b820 PDR ADOCK 05000269 [6 cLb

DUKE POWER COMPANY OCONEE NUCLEAR STATION Report Number: R0-269/82-ll Report Date: August 20, 1982 Occurrence Date: June 22, 1982 Facility: Oconee Nuclear Station, Seneca, South Carolina Identification of Occurrence: Keowee Hydro Unit 1 inoperable Conditions Prior to Occurrence: Oconee 1 - 100% FP Oconee 2 - 59% FP Oconee 3 - Cold Shutdown Description of Occurrence: On June 22, 1982, while Keowee Unit 1 was being tested to verify operability, the unit would not close into the system grid via the Keowee to 230KV Switchyard Tie Breaker (.*.CB-1).

Apparent Cause of Occurrence: The apparent cause of this occurrence was a leak in a float valve in the governor oil pressure tank for the Turbine Governor System.

The faulty float valve prevented automatic governor control of the turbine wicker gates. As a result, the e..bine was unable to attain sufficient speed to parallel to the system grid.

Analysis of Occurrence: The Keowee Hydro Generators are required to provide emergency power to Oconee Nuclear Station in the event of the loss of offsite electric power. During the period of inoperability of Keowee Unit 1, Keowee Unit 2 was operable and could have provided emergency power. The Emergency Power Switching Logic (EPSL) System is designed to select and transfer to the available onsite power path. The EPSL system was operable during this incident. Additionally, the operator could manually transfer to the redundant source. Hence, it is con-sidered that the health and safety of the public were not adversely affected by this incident. Investigation of this incident has identified a need for additional evaluation of the EPSL system which is currently in progress.

Corrective Action

Keowee Unit 2 was verified to be operable. The defective float valve on the Keowee Unit 1 governor was repaired and the unit was verified to be operable. The governor float valve on Keowee Unit 2 was inspected and found in satisfactory condition. Based on discussions with Woodward Governor Company it has been determined that the float valve failure is an isolated occurrence.