ML20080T036

RO 83-26:on 830917-18,all Main Steam Safety Valves Tested. All But One Valve Lifted Above Allowed Lift Point Tolerance of +1% of Setpoint.Caused by Using Incorrect Main Steam Header

ML20080T036
Person / Time
Site:	Three Mile Island
Issue date:	09/19/1983
From:	Toole R GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
5211-83-267, RO-83-26, NUDOCS 8310200011
Download: ML20080T036 (1)

Text

GPU Nuclear g gf P.O. Box 480 Middletown, Pennsylvania 17057 717-944-7621 Writer's Direct Dial Number:

September 19, 1983 Reports 5211-83-267 Dr. Thonas E. Murley Region I, Regional Administrator U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19405

Dear Sir:

Three Mile Island Nuclear Station, Unit 1 (TMI-1)

Operating License No. DPR-50 Docket No. 50-289 LER 83-26 This is to confirm the conversation between Mr. F. Young, Region I, NRC and Mr. M. Nelson, Supervisor Unit 1 Review Program at 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br /> on September 19, 1983. The event described below was declared reportable at 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br /> on September 19, 1983.

On September 17 and 18, 1983, all main steam safety valves were tested.

All except one valve lifted above its allowed lift point tolerance of

+1% of the setpoint. The range of the as found setpoints varied from approximately 1 to 29 psig. above the 1% tolerances.

The high setpoints were due to having set the valves in 1981 using incorrect indicated (low) main steam header pressures. This item is considered reportable in accordance with Technical Specification 6.9.2.A.2.

The details of this occurrence and the corrective actions to prevent recurrence will be provided within 14 days.

Sincerely, IoAe R. . Toole Operations and Maintenance Director, TMI-1 RJT: MAN:j rg cc: R. Conte CARIRS 8310200011 830919 PDR ADOCK 05000289 S PDR cpu Nuciear is a part or me cenerai Puene unwes system i

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