ML20153G331

From kanterella
Jump to navigation Jump to search

Forwards Design Calculation Ned 84-055, Standby Gas Treatment Sys LOCA Flow Analysis. Evaluation Revised to Determine Effects on Standby Gas Treatment Sys from Design Basis LOCA Gas Flow Through Two Bypass Valves
ML20153G331
Person / Time
Site: Cooper Entergy icon.png
Issue date: 09/02/1988
From: Trevors G
NEBRASKA PUBLIC POWER DISTRICT
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20153G335 List:
References
CNSS886276, TAC-M42573, NUDOCS 8809080117
Download: ML20153G331 (1)


Text

"

I e

d m

Nebraska Public Power District "

  • "%hkk$hbst"""

CNSS886276 September 2, 1988 U. S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555

Subject:

Containment Purge and Vent Review (TAC M42573)

Cooper Nuclear Station NRC Docket No. 50-298, DPR-46

Reference:

Letter from J. M. Pilant to D. B. Vassallo dated December 7, 1984, (NLS 8400204), "Containment Purge and Vent System Unresolved Issues".

Gentlemen:

Reference 1 submitted an evaluation of the effects on the Standby Gas Treatment (SGT) System from the gas flow resulting from a design basis LOCA through a two inch bypass around an inboard containment purge and vent valve. The evaluation concluded that the SGT system would remain operable after being subjected to this gas flow and therefore, that SGT system operation through the bypass v.1ve need not be constrained by a 90 hour0.00104 days <br />0.025 hours <br />1.488095e-4 weeks <br />3.4245e-5 months <br /> / year limit with coolant temperature > 212'F.

This evaluation has been revised to determine the effects on the SGT system from design basis LOCA gas flow through two such bypass valves. This analysis covers the situation where venting to the SGT system is taking place through both the Drywell and Torus bypasses around their respective inboard containment purge and vent valve.

The revised evaluation is enclosed for review and concludes that the SGT system will remain operable under this condition if a LOCA occurs, g If you have any questions, please call.

ou '

@@@ Sincerely, o.

O i .

tw . . revors 2 Division Manager

$@ Nuclear Support o

GAT:GRS:sg/mhCNS.1801 (COMM18)

{ct w@g Enclosure cc: NRC Regional Office, Region IV, Arlington, Texas L gg NRC Senior Resident Inspector, Cooper Nuclear Station

. ..