ML19320C534
| ML19320C534 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/08/1980 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Snyder B Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML19320C535 | List: |
| References | |
| TLL-320, NUDOCS 8007170338 | |
| Download: ML19320C534 (2) | |
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Metropolitan Edison Company Post Office Box 480 Middletown, Pennsytvania 17057
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717 944 4041 Wr:ter's Direct o.at Number July 8,1980 TLL 320 TMI Progtsm Office Attn:
Mr. Bernard J. Snyder, Program Director U. S, Nuclear Regulatory Commission Washingtca, D.C.
20555
Dear Sir:
Three Mile Island Nuclear Station, Unit II (DfI-2)
Operating License No. DPR-73 Docket No. 50-320 Recovery Operations Plan Change Request No. 2 Enclosed is Recovery Operations Plan Change Request No. 2, concerning surveillance requirements of the Auxiliary Building and Fuel Handling Building Ventilation Systems. This change request is made to change the ventilation system flow rate requirements during testing subsequent to the removal from service of the Supplementary Ventilation System.
Sincerely,
/s/ G. K. Hovey G. K. Hovey Director, TMI-II GKH:LJL: dad Enclosure cc:
J. T. Collins D. DiIanni H. Silver R. Reid V. Stello B. H. Grier ol 5
8007170 3'3$
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Three Mile Island Nuclear Station, Unit II Operating License No. DPR-73 Docket No. 50-320 Recovery Operations Plan Change Request No. 2 The licensee requests that pages 4.9-1 and 4.9-2 of the Recovery Operations Plan for TMI-II be replaced. The replacement pages are attached to this submittal.
Reason for Change After the March 28, 1979, incident at Three FEle Island, the plant ventilation stack, used to provide an ef fluent pathway for Auxiliary Building and Fuel Handling Building ventilation exhaust flow streams, was fitted with an end cap to render it inoperable. Supplementary ventilation units, consisting of additional fans and filters, were added to the ventilation system to:
(1) increase system flow rates, and (2) provide additional filtering of the flow stream prior to discharge.
Because of the addition of the supplementary ventilation system to the existitg building ventilation system, increased system flow rates were achieved.
Upon return of the ventilation system to its normal operational configuration, the supplementary fans will no longer be available for the achievement of higher than design ventilation flow rates. The design flow rates for each of the building ventilation systems are:
Auxiliary Building 65,000 cfm Fuel Handling Building 36,000 cfm These flow rate values are reported in Sections 9.4.2.2 and 9.4.3.2 of the TMI-II Final Safety Analysis Report and are sufficient for the performance of proper ventilation system operation to accomplish the objectives of:
(1) building heat removal, (2) maintenance of the building at a negative pressure, relative to the atmosphere, and (3) atmospheric radiological control.
Although supplementary ventilation units have been added to the ventilation flow stream, it is not prudent to require that this flow stream operate at a higher flow rate than the original system design. Therefore, the proposed Recovery Operations Plan change request is based on the original ventilation system desian flow rates for the accomplishment of the above-listed objectives.
Safety Evaluation Justifying Chance No safety evaluation is required for the justification of this change. This proposed change requires the verification of system operation in accordance with its design.