ML19325E082

Responds to Generic Ltr 89-16 Re Installation of Hardened Wetwell Vent.Hardened Vent Will Be Installed at Facility. Installation of Vent Would Further Reduce Risk of Loss of DHR Sequence

ML19325E082
Person / Time
Site:	Cooper
Issue date:	10/27/1989
From:	Trevors G NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-89-16, NLS8900400, NUDOCS 8911010155
Download: ML19325E082 (2)

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GENERAL of FICE l

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NLS8900400 '

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'h ' October 2*l, 1989 l

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U.S. Nuclear Regulatory Comission ,

y Attention: Document Control Desk -j Washington, DC 20555 l t

1 Sub. ject : Response to Generic Letter 09-16 L installaticsn of a Hardened Wetwell vent  !

Cooper Nuclear Station ]

Docket No. S0-298, DPR-46  :

Gentlement i

, On'. September 1, 1989, the Nuclear Regulatory Commission (NRC) issuei Generic Letter 89-16'. The purpose of GL 89-16 was to inform. the owners of Boiling i

l-Water Reactor ' (BWR) plants with Mark I containments of the NRC' program for- I disposition - of the -- issues related to the Mark I containment Performance .!

Improvement Program. This. generic letter encouraged utilities to voluntarily .!

installra hardened vent under the provisions of 10 CFR 50.59.

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I A review of SECY 89-017 by the BWR utilities indicates that the primary >

l benefit of the hardened vent is the reduction of risk associated with the loss [

L of decay heat removal sequence (TW) at boiling water reactors with Mark I (

containments. Therefore, the Nebraska public Power District (the District) [

intends to install a hardoned vent at the Cooper Nuclear Station (CNS). The l District will' be working with the BWR Owner's Group to develop generic design criteria:for the installation. The District will also rely upon the results i}

f of. the ' Individual Plant Examination (IPE) study for CNS, to identify system

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l interaction effects between the hardened vent and the existing plant design.

L It' is anticipated that the generic BWR Owner's Group design criteria will be  !

l available for NRC review by April 30, 1990. The District's Individual Plant  !

Examination, . scheduled to be submitted in October 1991, will include the U

!: effects of installing a hardened vont on the Cooper Nuclear Station.

H Therefore, since there is no refueling outage scheduled in 1992, the District intends to install a hardened wetwell vent at the Cooper Nuclear Station by l

L startup from the 1993 refueling outage, currently scheduled for the spring of l 1993.

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It is the belief of the Nebraska Public Power District that the risk of the j loss of decay heat removal sequence (TW) is already low. The installation of l the hardened vent may further reduce the risk of this sequence and will l

contribute to closing the NRC's Mark I Containment Performance Improvement Program.

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i Should' you have any questions concerning this response, please contact this office.

Sincerely, i

G. , 'revors Division Manager Nuclear Support GAT /mtbtjw cc U.S. Nuclear Regulatory Comission Rogion IV d Arlington, TX NRC Senior Resident inspector Cooper Nuclear Station l

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