ML18191A239
| ML18191A239 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 09/29/1977 |
| From: | Renberger D Washington Public Power Supply System |
| To: | Engelken R NRC/RGN-V |
| References | |
| G02-77-363 | |
| Download: ML18191A239 (6) | |
Text
NRC FOPM',)95 U.S. NUCLEAR REGULATORY iIISSI
\\z'TBIi NRC DISTRIBUTION FoR PART 50 DOCKET MATERIAL DOCKET NUMBER FILE NUMBER R. H. Engelken F ROM:
WPP SS Richland, Uashington 99352 D. L. Renberger DATE OF DOCUMENT 09 29 77 DATE RECEIVED 12 08 77 ETTER QORIGINAL J2fCOPY 0 NOTOR IZED gkf$ICLASSIFI ED PROP INPUT FORM NUMBER OF COPIES RECEIVED Furnishing information copcernin DES C 8 IP TI0 N assessment of the impact of suppression po dynamic loading pheomena on the WPPSS Nucl Project No.
2 struc'tures and equipment...
ENCLOSURE 1
ar 2p'LANT NAiIE.
GPSS 2
jcm 12/09/77 VCH CHIEF:
PROJECT MANAGER:
LIC. ASST:
WC/i FOR ACTION/IN FORMATION ENVIRONiiIENTAL ASSIGNED AD:
BRANCH CHIEF:
B.
HARLESS INTERNALDISTRIBUTION SYSTEMS SITE SAFETY G
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A JOINT OPERATING AGENCY Rf~l6%'f MCB HKIP'i Washington Public Power Supply System P. O. BOX 968 3000 GKO. WASHINGTON WAY RICHLAND. WASHINGTON 99352 PHONE(509) 946.1611 September 29, 1977 G02-77-363 Docket No. 50-397 gjjP,, 9 R.
H. Engelken, Director Nuclear Regulatory Commission, Region V
Suite 202, Walnut Creek Plaza 1990 N. Cali'fornia Boulevard IIalnut Creek, California 94596
Subject:
WPPSS NUCLEAR PROJECT NO.
2 SUPPRESSION POOL HYDRODYNAMIC LOADING INDUCED REACTOR BUILDING ACCELERATIONS
Reference:
Gentlemen:
- Letter, D. L. Renberger to R.
H. Engelken,
- entitled, "Mark II Containment-Design Deficiency,"
dated February 24, 1976.
(G02-76-65)
As you are aware, we have an ongoing assessment of the impact of suppression pool dynamic loading phenomena on the WPPSS Nuclear Project No.
2 structures and equipment.
From some of the prelim-inary results of this assessment, we have determined that suffici-ent loading is transmitted to equipment outside the suppression pool to require further evaluation and design change.
The reactor building accelerations are calculated to occur as a result of hydro-dynamic loading on the suppression pool floor/basemat.
Because of schedule considerations, we are implementing as a precautionary mea-sure at this time, revisions to drywell snubber requirements to ac-commodate the currently available loadings.
These calculated build-ing accelerations are based on preliminary conservative load defini-tions which are expected to be refined during the next several months as a part of the Hark II Owner's Program.
77343010+
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pe Nuclear Regulatory Commission, Region V
Page 2
As discussed in the referenced previous correspondence related to the suppression pool dynamic problem, it is our intention to handle resolu-tion of this problem as a NRC-Division of Reactor Licensing issue.
A revision to the WPPSS Nuclear Project No.
2 Design Assessment Report describing our approach in the resolution of this matter is scheduled for completion the first quarter of 1978.
We trust this manner of resolu-tion will be. acceptable to you.
If you have any questions with regard to this matter please contact us.
DLR GLG:vh Very truly yours, 6 Q /0'.uL<<p&r D. L.
RENBERGER Assistant Director Generation 8 Technology cc:
Director of Nuclear Reactor Regulations
~ Attention:
Hr. Steven A. Varga Light Water Reactor Projects Branch 4
U. S. Nuclear Regulatory Commission Washington, D. C.
70555 D.
Roe - BPA JJ Byrnes -
BSR JB Knotts
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