ML20085H603

Ro:On 830827,high Deuterium Alarm in Waste Gas Hold Up Sys Received.Caused by Leakage from Makeup Tank Gas Space Into Vent Header Due to Incorrect Valve Lineup

ML20085H603
Person / Time
Site:	Three Mile Island
Issue date:	08/29/1983
From:	Hukill H GENERAL PUBLIC UTILITIES CORP.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
5211-83-248, NUDOCS 8309120161
Download: ML20085H603 (1)

Text

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Nuclear  ::=,et;;;rer" "

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

August 29, 1983 5211-83-248 Dr. Thomas E. Murley Region I, Regional 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. DP R-50 Docket No. 50-289 LER 83 High Waste Gas Hydrogen Concentration This is to confirm the conversation between Mr. R. Conte, Region 1, NRC and Mr. M. Nelson, Supervisor Unit 1 Review Program at 1045 hours0.0121 days <br />0.29 hours <br />0.00173 weeks <br />3.976225e-4 months <br />, August 28, 1983, concerning the Hydrogen (H ) c ncentration in the TMI-l Waste Gas 2

Hold Up System. This event, as described below, was considered to be report-able per Technical Specification 6.9.2.A.2 in that H concentration in the 2

Waste Gas Hold Up System exceeded 2% by volume and was not reduced to within limits within one hour (T.S. 3.22.2.5).

At 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> on 8/27/83, a high H alarm2 in the Waste Gas Hold Up System (Vent Headers) was received. A manual backup sample from this miscellaneous Waste Storage Tank Gas space indicated 4.6% H7 and an immediate Nitrogen (N2 ) purge of the vent header system was starEed. The concentration of H 2 gas was reduced to less than 2% by 0930 8/28/83. The cause for the H 2 concentration increase is leakage from the Make Up Tank Gas Space into the vent header due to an incorrect valve lineup.

The Make Up Tank had just been pressurized with H gas earlier in the shift 2

on 8/27/83 as part of the RCS Heat Up for OTSG testing. The event details will be provided in the 14 day followup report.

Sincerely, D. I kill Director, TMI-1 HDH:HBS:vj f cc: R. Conte GPU Nuclear Corporation is a subsidiary of the General Public Utilities Corporation [(, '

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