ML20080J265

RO 83-028:on 830920,manual Inside Containment Isolation Valve (IA-V20) in Instrument Air Penetration to Reactor Bldg Found Open.Caused by Stem Bushing in Valve Yoke Backed Out of yoke.IA-V20 Valve Bonnet Replaced

ML20080J265
Person / Time
Site:	Three Mile Island
Issue date:	09/21/1983
From:	Toole R GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
5211-83-270, RO-83-028, RO-83-28, NUDOCS 8309260274
Download: ML20080J265 (1)

Text

Nuclear carricr""

Route 441 South Midahtown, Pennsylvania 17057-0191 717 944 7621 TELEX 84-2386 Writer's Direct Dial Number:

September 21, 1983 5211-83-270 Dr. T. E. Murley Region I, Pegional Administrator U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Dear Sir:

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

Operating License No. DPR-50 Docket No. 50-289 Licensee Event Report 83-028 This is to confirm the conversation between Mr. R. Conte and Mr. F. Young, Region I, NRC, and Mr. M. Nelson, Supervisor Unit 1 Review Program, at 1530 hours0.0177 days <br />0.425 hours <br />0.00253 weeks <br />5.82165e-4 months <br /> on September 20, 1983. The event described below was declared' report-able at 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> on September 20, 1983.

On September 20, 1983, a manual inside containment isolation valve (IA-V20) in the Instrument Air penr.tration to the Reactor Building was found to be open contrary to the requirements of Technical Specification 3.6.1 and 1.7.c and Operating Procedure 1101-3, " Containment Integrity and Access Limits".

This valve appeared to be closed. The stem b2shing in the valve yoke had backed out of the yoke toward the valve handwheel such that when turned in the closed position the handwheel was mechanically limited from turning.

The outside containment isolation valve (IA-V6) on this penetration was locked closed. Immediate corrective action has been t- o to replace the IA-V20 valve bonnet with one which has a properly ca ed yoke stem bushing and to close and leak test this valve. 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 recur-rence will be provided within 14 days.

Sincerely, R

M&.

. Toole 8309260274 830921 PDR ADOCK 05000289 Operations & Maintenance S PDR Directo r x RJT: MAN:vj f 7y 7

cc: R. Conte J-GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation O