ML19309E791
| ML19309E791 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/16/1980 |
| From: | Hovey G METROPOLITAN EDISON CO. |
| To: | Jay Collins NRC - NRC THREE MILE ISLAND TASK FORCE |
| References | |
| TLL-183, NUDOCS 8004240399 | |
| Download: ML19309E791 (2) | |
Text
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Metropolitan Edison Company Post Office Box 480 gj Middletown, Pennsylvania 17057 717 9444041 Writer's Direct Dial Nurnber April 16,1980 TLL 183 TMI Program Office Attn:
J. T. Collins, Deputy Manager U. S. Nuclear Regulatory Commission c/o Three Mile Island Nuclear Station Middletown, Pa.
17057
Dear Sir:
Three Mile Island Nuclear Station, Unit II (TMI-2)
Operating License No. DPR-73 Docket No. 50-320 Reactor Building Purge System This letter is in response to your letter (NRC/TMI-80-050) dated March 28, 1980 concerning the hydrogen control system filter housing negative pressure I
rating.
The filter housing is rated for 18 inches W.G. negative pressure.
TMI-II specification 2555-63 requires that the filter housing be designed to with-stand cabinet field tests "to positive and negative pressures of 12 inches and 18 inches W.G. respectively." The pressure of -11 inches W.G. reported in the Reactor Building Purge Program Safety Analysis and Environmental Report is in error. Additionally, Metropolitan Edison has performed a structural design review of the filter housing.
This revieu showed by calculation that the filter housing can withstand negative pressures up to 60 inches W.G.
The filter housing meets the acceptance criteria outlined by industry standards at the time the housing was specified. We have reviewed the requirements of ANSI /ASME 509.
The filter housing was not designed to meet the requirements of ANSI /ASME 509 (issued in December 1976) and the imposition of those requirements at this time is considered inappropriate by Metropolitan Edison. The filter housing will be tested at -15 inches W.G.,
which is the peak pressure that the fan can exert on the filter plenum.
The automatic fan shutoff described in our letter (TLL 061) dated February 21, 1980 will prevent the occurrence of more severe pressure differentials. Although ANSI /ASME 509 is not deemed to be the appropriate standard, Metropolitan Edison considerg this proposed test to be satisfactory to meet the requirements of paragraphs 4.6 and 5.10 of that standard.
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It is anticipated that this response fully addresses your concerns.
Should you have any questions or comments regarding this response, please contact Mr. E.
D. Fuller of my staf f.
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T.' Collins TLL 183 Sincerely,
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