05000245/LER-1982-013, Forwards LER 82-013/03L-0.Detailed Event Analysis Encl

Forwards LER 82-013/03L-0.Detailed Event Analysis Encl

ML20058D404
Person / Time
Site:	Millstone
Issue date:	07/15/1982
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO.
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20058D406	List: 05000245/LER-1982-013, Forwards LER 82-013/03L-0.Detailed Event Analysis Encl 05000245/LER-1982-013-03, /03L-0:on 820615,while Performing Gas Turbine Emergency Fast Start Test,Gas Turbine Failed to Start.Caused by Lack of Air to Air Start Motor Due to Rusty Air Pressure Regulating Valve.Valve Replaced
References
MP-1-2117, NUDOCS 8207270097
Download: ML20058D404 (2)

LER-1982-013, Forwards LER 82-013/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2451982013R00 - NRC Website

text

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??.C' lll" July 15,1982 MP-1-2117 Mr. Ronald C. Haynes Regional Administrator, Region 1 Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

Reference:

Provisional License DPR-21 Docket No. 50-245 Reportable Occurrence R0-82-13/3L

Dear Mr. Haynes:

This letter forwards the Licensee Event Report for Reportable Occurrence R0-82-13/3L required to be submitted within 30 days pursuant to the requirements of the Millstone Unit 1 Technical Specifications, Section 6.9.1.9.b.

An additional three copies of the report are enclosed.

Yours truly, NORTHEAST NUCLEAR ENERGY COMPANY d'f1 &

E J. Mroczka Station Superintendent Millstone Nuclear Power Station EJM/TST:mo

Attachment:

LER R0-82-13/3L cc: Director, Office of Inspection and Enforcement, Washington, D. C. (30)

Director, Office of Management Information and Program Control, Washington, D. C. (3)

U. S. Nuclear Regulatory Commission, c/o Document Management Branch, Washington, D. C. 20555 8207270097 820715 v

PDR ADOCK 05000245 jfO g

PDR

LER 82-13/3L NORTHEAST NUCLEAR ENERGY COMPANY MILLSTONE NUCLEAR POWER STATION - UNIT 1 PROVISIONAL LICENSE NUMBER DPR-21 DOCKET NUMBER 245 Identification of Occurrence Operation in a degraded mode permitted by a limiting condition occurred when the Gas Turbine failed to start.

Conditions Prior to Occurrence Prior to occurrence the unit was operating at a steady state power level of 100 percent.

Description of Occurrence j

On June 15, 1982, at 0502 hours0.00581 days <br />0.139 hours <br />8.300265e-4 weeks <br />1.91011e-4 months <br />, while performing Gas Turbine Emergency Fast Start Test, the Gas Turbine failed to start when given a fast start signal from the control room. Operations personnel re-energized the 14G bus and declared the Gas Turbine Generator inoperable. Technical Specification 3.9.a requires the Diesel Generator and the Gas Turbine Generator (both emergency power sources) to be operable at all times.

Apparent Cause of Occurrence Investigation revealed that the air starter motor did not receive an air supply.

The air pressure regulating valve which controls air pressure to the starter motor failed.

Disassembly showed that the valve contained particles of rust.

Analysis of Occurrence Inoperability of the Gas Turbine did not result in a condition which had not been analyzed. The Gas Turbine is one out of two emergency power sources that are utilized for engineered safeguard systems.

In an actual emergency condition where emergency core cooling systems are required and a loss of off-site power accompany it, the Gas Turbine and the Diesel provide emergency power.

Each power source is independent of the other, thereby allowing the Gas Turbine or Diesel to solely provide emergency power to redundant systems if the other fails.

Corrective Action

The air pressure regulating valve was replaced and sent to the manufacturer for testing and servicing.

MP-1 is presently performing an engineering evaluation on the Gas Turbine rust problem. Modifications such as installing inline air filters, painting the in-side of the air receiver and other means to minimize rust particles in the air system are'being considered.

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