ML17277A440
| ML17277A440 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 02/08/1983 |
| From: | Bouchey G WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| GO2-83-102, NUDOCS 8302150189 | |
| Download: ML17277A440 (4) | |
Text
'REGULATORY ORMATION DI'STRIBUTION 'SYS f ('RIDS)
AOCEISS10N,NBR:830?]'50].89
. DOC ~ DATE: 83/02/08 NOTARIZED:
NO DOCKET
'0 FACIL:50.'397 NPPSS'Nuclear
'Project~
Uni;t 2i Nashington ~Public,Powe 05000397
'COUTH,NAME;
'AUTHOR 'AFFILIATION
-BOUCHEY~G ~ DE Hashington >>Public IPower 'Supply 'System
~RBCIP ~ NAME>>.
'RECIPIENT AFFIL'IATION SCHNENCER,A, L"i cense.ng Br anch '2 "SUBJECT'dvises-of,necessity of 'capping <thnee downcotnets tto
>>eliminate LOCA >>Je,t loads on.ECCS suction ipipirig 'in wetwelli
>Capping will be--.accomplished by welding 14 inch tplate'>>to
<jet"defi ector.
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Washington Public Power Supply System P.O. Box 968 3000 George Washington Way Richland, Washington 99352 (509) 372-5000 February 8, 1983 G02-83-102 Docket No. 50-397 Director of Nuclear.Reactor Regulation Attention:
Mr. A. Schwencer, Chief Licensing Branch No.
2 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.
C.
20555
Subject:
NUCLEAR PROJECT NO.
2 CAPPING DOWNCOMERS
Dear Mr. Schwencer:
Confirming a telephone conversation with Mr. Farouk Eltawila of the Containment Systems Branch, this is to advise you that it will be necessary to cap three downcomers to eliminate LOCA jet loads on ECCS suction piping in the wetwell.
The three downcomers direct discharging water, air, and steam during a
LOCA onto the
- LPCS, HPCS, and RHR-C suction lines which partially obstruct the downcomer exit a short distance below the ends of khe downcomers.
In order to eliminate the postulated LOCA jet loads which would be applied to these lines, it has
'een decided to cap downcomers by sealing the entrance to the downcomers above the diaphragm floor.
This will be accomplished by welding a 1/4-inch plate to the jet deflector. 'he effect on drywell pressurization following a LOCA, due to the approximately 3/ reduction in vent area, has been evaluated and found not to be significant.
This will be docu-mented in a future revision to the FSAR.
Very truly yours,
~D'Ba G.
D. Bouchey
- Manager, Nuclear Safety and Licensing EAF:cph cc:
R. Auluck -
NRC WS Chin -
- BPA,
. R. Feil -
NRC Site F. Eltawila -
NRC I 83D2l50189 830208 PDR ADOCK 05000397
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