ML17037B664

Letter Regarding a Correction to the Heading for Question 3, Table C in Plant Unique Analysis Report for Torus Support System and Attached Piping for Nine Mile Point Nuclear Station.

ML17037B664
Person / Time
Site:	Nine Mile Point
Issue date:	12/01/1976
From:	Schneider R Niagara Mohawk Power Corp
To:	Lear G Office of Nuclear Reactor Regulation
References
Download: ML17037B664 (6)

Text

U S NUCLEAR REGULATORY COI iSION DOCKET NUMBER NRC FoRM 195 I,.6) .. A 50>>220 FILE NUMBER AAIRC DISTRIBUTION Fon PART 50 DOCKET MATERIAL TO: FROM: DATE OF DOCUMENT Niagara Mohawk Power Corp. 12/1/76 Mr. George Lear Syracuse, New York DATE RECEIVED R. R. Schneider 12876 QNOTORI2ED PROP INPUT FORM NUMBER OF COPIES RECEIVED

@LETTER QOR I G INAI IRfUNC LASSIF I E D One signed OCOPV DESCRIPTION ENCI.OSURE Ltr. w/attached....re their ll/3/76 ltr....

concerning "Plant Unique Analysis Report for Torus~Support System and Attached Piping ACED@ EDGED for Nine Mile Point Nuclear Station.

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PLANT NAME:

Nine Hile Point Unit No. 1 SAFETY FOR ACTION/INFORMATION 129 6 RJL ASSXGNED AD!

H&iX Lear Nowicki PROJECT MANAGER L~CASST Parrish LIC ASST INTERNAL DISTR I BUTION SYSTEMS SAFETY PLANT SYSTEMS STESA NRC PDR HEINEMAN TEDES 0 X&E SCHROEDER 0 A OELD GOSSICK & STAFF ENGINEERING IPPOL TO E 0 MIPC HACARRY ERNST CASE KNIGHT BALLARD HANAUER ~

SIHWEIL OPERATING REACTORS SPANGLER HARLESS PA ICK STELLO SXTE TECH PROJECT MANAGEMENT REACTOR SAFE OPERATING TECH GAMHILL BOYD ROSS EISENHUT STEPP PE COLLINS NOVAK HULMAN HOUSTON ROSZTOCZY PETERSON C11ECK BUTLE SITE ANALYSIS MELTZ .S VOLLMER HELTEMES AT & I BUNCH SKOVHOLT SALTZMAN J ~ COLLINS RUTBERG KREGER EXTERNAL DISTRIBUTION CONTROL NUMBER LPDR ~ Oswe o N. Y. NAT LAS B 0 T IC! REG V IE ULR KSON OR NSIC!

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C NIAGAR MOHAWK POWER CORPORATION NIAGARA 300

~ MOHAWK ERIE 80UI.EVARO WEST SYRACUSE, N.Y. I3202 ee December 1, 1976

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Gp Director of Nuclear Reactor Regulation Attn: Mr. George Lear, Chief Operating Reactors Branch ¹3 U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Re: Nine Mile Point Unit 1 Docket No. 50-220 DPR-63

Dear Mr. Lear:

My letter of November 3, 1976 transmi tted additional information regarding the "Plant Unique Analysis Report for Torus Support System and Attached Piping for Nine Mile Point Nuclear Station." The heading for Question 3, Table C, should be corrected to read as follows: "...BP = 1.5 psi..."

Attached is'a revised Table C.

Very truly yours, NIAGARA MOHAWK POWER CORPORATION R. R. SCHNEIDER Vice President-Electric Production MGM/sz Attachment

L TABLE C SUtltlARY OF MALYSIS RESULTS BASE CASE LOAD hP =~l~n')

t<AXIHUtl DOWN LOADS For 4'-6" Submer ence Component ~a Load/Stress Strength 4J cU 5 Ratio Evaluation CR 0 CL Cl c( O E/l '~

Ca 1 cul.a ted Capacity Act. Al 1 ow,.

Ring Girder Stress, psi tteoIbrane + Bending 34,800 81,600 ,43 ,50

'hear 9,170 40,800 .23 .50 Torus Shel.l Stress, psi 21,700 64,000 .33 .50 tlembrane + Bending X X , 15,600 40,800 .38 .50 Shear Column-Torus Meld Joint, Inner Column Web Weld (kips) 678.0 .75 1.0 Flange Meld (in.-kips) 2,213.0 .05 ~

1.0 65;5 7OO.O, :10 1.0 Outer Column

'lfeb Meld (kips) .87 1.0 Flange Meld'(in.-kips) z,NI:8 1.0 158.7 700. 0 1.0 Column Buckling Inner Column Fquation 19 X N/A H/A .40 0.5

. Equation 20 H/A H/A t(/A ~

t(/A N/A Outer Column Equatidn 19 X H/A H/A .38 0.5 Equation 20 /A i'(/A t(/A N/A N/A Column Base Joint Inner Column Down Load (k1ps) 508.2 1602.0 .31 .50 Up Load (kips) 124.7* 461 45 .27 .50 Outer Column Down Load (kips) 595,1 1602.0 -

.37 .50 Up Load '(kips) 111- 3* .461.45 .24 .50

• Conservatively computed by multiplying values in original Plant Unique Ana1ys i s Tab I e 9 by Hap, 01d

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