ML18038A048

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Notifies That 10 Scuppers Will Be Provided in Screenwall Bldg Roof Based on Calculation of Max Roof Loading Caused by Rainfall.All Other safety-related Roofs Can Accommodate Max Roof Loading.W/One Oversize Drawing
ML18038A048
Person / Time
Site: Nine Mile Point Constellation icon.png
Issue date: 09/03/1985
From: Mangan C
NIAGARA MOHAWK POWER CORP.
To: Butler W
Office of Nuclear Reactor Regulation
Shared Package
ML18038A049 List:
References
(NMP2L-0484), (NMP2L-484), NUDOCS 8509060154
Download: ML18038A048 (6)


Text

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,RESULAI INFORMATION OISTRISUTIOAYSTEM (RIOR)

ACCESSION NSR'8509060150 DOC ~ DATE: 85/0'9/03 NOTARIZED: No DOCKET FACIL:50>>010 Nine Mile Point Nuclear Station, Unit 2i Niagara Moha 05000010 AUTH, NAME AUTHOR AFFILIATION MANGANFC,Y. Niagara Mohawk Power Corp.

REC IP ~ NAME RECIPIENT AFFILIATION BUTLERgN ~ Licensing Branch 2

SUBJECT:

Notifies that 10 scuppers will be provided in screenwall bldg roof based on. calculation of max roof loading caused by rainfall.All other safety-related roofs can accommodate max roof loading,A/one oversize drawing, DISTRIBUTION CODE: B001D COPIES RECEIYED:LTR ENCL SIZE:

TITLE: Licensing Submittal; PSAR/FSAR Amdts L Related Correspondence'OTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL" NRR/DL/ADL LB2 NRR LB2 LA 1

1 0

0 NRR HAUGHEYFM BC Ol ' 1 0 1

INTERNAL: ACRS 41 6 6 ADM/LFMB 1 0 ELD/HDS3 1 0 IE F ILE 1 1 IE/DEPER/EPB 36 1 1 IE/DQAYT/QAB21 1 1 NRR ROEFM ~ L 1 1 NRR/DE/AEAB 1 0 NRR/DE/CEB 11 1 1 NRR/DE/EHEB 1 1.

NRR/DE/EQB 13 2 2 NRR/DE/GB 28 2 2 NRR/DE/MEB 18 1 1 NRR/DE/MTEB 17 1 1 NRR/DE/SAB 24 1 1 NRR/DE/SGEB 25 1 1 NRR/DHFS/HFEBQO 1 1 NRR/DHFS/LQB 32 1 1 NRR/DHFS/PSRB 1 1 NRR/DL/SSPB 1 0 NRR/DSI/AEB 26 1 1 NRR/DSI/ASB 1 1 NRR/DSI/CPB 10 1 1 NRR/DS I/CSB 09 1 1 NRR/DSI/ICSB 16 1 1 NRR/DSI/METB 1 1 NRR/DSI/PSB 19 1 1 22 12'RR/DSI/RAB 1 1 NRR/DS I/RSB 23 1 1 REG FILE 04 1 1 RGN1 3 R t 1/D 0 A M I /M I 8 1 0 EXTERNAL: 24X 1 1 BNL(AMDTS ONLY) 1 1 DMB/DSS (AMDTS) 1 LPDR 03 1 1 NRC PDR 02 1 1 NSIC 05 1 1-=

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TOTAL NUMBER OF COPIES REuUIRED: LTTR 52 ENCL

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~ U7 MQNIAMK HIIASAIRk, NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE, N.Y, 13202/TELEPHONE (315) 474-1511 September 3, 1985 (NMP2L 0484)

Mr. Walter Butler, Chief Licensing Branch No. 2 U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Butler:

Re: Nine Mile Point Unit 2 Docket No. 50-410 We have completed our design for the parapet scuppers for Nine Mile Point Unit 2. The Reactor Building, Screenwell Building, Diesel Generator Building, Standby Gas Treatment Building,,Control Building and Auxiliary Service Building roofs were evaluated for the probable maximum precipitation (rainfall) based upon Hydrometeorological Report Nos. 51 and 52. The maximum roof loading due to this condition was determined to be 27.1 inches of standing water, which was conservatively calculated to be 145 lbs/ft2.

Based on this calculation, scuppers will be provided in the Screenwell Building roof. All other safety related roofs can accommodate the maximum roof loading described above. A typical scupper detail is shown on Drawing EA 14A-7. The scuppers will be placed at about five inches above the top of the roof. Ten scuppers will be provided for the Screenwell Building. The Final Safety Analysis Report will be changed to address these design aspects.

Very truly yours,'.

V. Manga Senior Vice President NLR/rla 0917G xc: R. A. Gramm, NRC Resident Inspector Project File (2) dol s 5 85O9gj g~ ~

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7 NIAQARA U MQHAWK NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARO WEST, SYRACUSE, N.Y. 13202/TELEPHONE (315) 474-1511 September 3, 1985 (NMP2L 0484)

Mr. Walter Butler, Chief Licensing Branch No. 2 U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Butler:

Re: Nine Mile Point Unit 2 Docket No. 50-410 We have completed our design for the parapet scuppers for Nine Mile Point Unit 2. The Reactor Building, Screehwell Building, Diesel Generator Building, Standby Gas Treatment Building, Control Building and Auxiliary Service Building roofs were evaluated for the probable maximum precipitation (rainfall) based upon Hydrometeorological Report Nos. 51 and 52. The maximum roof loading due to this condition was determined to be 27.1 inches of standing water, which was conservatively calculated to be 145 lbs/ft2.

Based on this calculation, scuppers will be provided in the Screenwell Building roof. All other safety related roofs can accommodate the maximum roof loading described above. A typical scupper detail is shown on Drawing EA 14A-7. The scuppers will be placed at about five inches above the top of the roof. Ten scuppers will be provided for the Screenwell Building. The Final Safety Analysis Report will be changed to address these design aspects.

Very truly yours, C. V. Manga Senior Vice President NLR/rla 0917G xc: R. A. Gramm, NRC Resident Inspector Project File (2)