ML20091G356

Rev 0 to Shroud Repair Program for Quad Cities Unit 2, Shroud Head Contact on Upper Support

ML20091G356
Person / Time
Site:	Quad Cities
Issue date:	06/15/1995
From:	Jahanian Y, Potter M, Svarney R COMMONWEALTH EDISON CO.
To:
Shared Package
ML20091G343	List: ML20091G339 ML20091G346 ML20091G356
References
GENE-771-113-06, GENE-771-113-0695-R0, GENE-771-113-6, GENE-771-113-695-R, NUDOCS 9507100070
Download: ML20091G356 (4)

Text

RCV BY: CONI ED . U-10-05 . 12:06 . ENC BLDG-.  :#25 l , JUN 15 '95 0781GPM GE" NUCLEm EFERGY p.17 i

s SHROUD REPAIR PROGRAM PCR QU AD CITIES UNIT 2 Shroud Head Coatnet on Upper Support GENE-771113-0695 REV. O DRF# B13-01740 Back up Calculations with Impact Factor for FDDR# EE2-0505 Jens 18,1MS M

Prepared By: 7 L- - -

Plant Design Engineer (as yg p 2 .

Veetiled By: /F' F IN MikaFetter Reesear sad Plant Deelen Enginearlag Appened By: L M 8varney Pn@eet Manspor p 4

9507100070 950619 PDR ADOCK 05000254 P PDR

RCV BY:COM ED . 6-19-95 . 12:07 ENC BLDG- :02G

, JUN 15 '95 07:17PM GE NUCLEFA DERGY p,gg GENE-771-113 0695 REV. 0 N CES

1. 718B316D + o OE Shroud Head and Separators Drawing

2. I 12D6541.._/. 4 OE Upper support Long Drawing

3. GENE-771-631094 Quad Chies Shroud and Repair REV.O Hardware Strees Analysis

4. 919D611P001 Rev. 4 Quad Cities GE Shmud Head Bok Drawing

5. 112D5487 Rev. 6 Quad Cities GE Reactor, ModiScation & Installation Drawing

6. GENE-771691094 Backup Calculations fbr Quad Cities Shroud Repair REV.1 Shroud Stress Report QESCRIPI1ON During installation of the shroud head and separators assembly at Quad Cities Unit 2, two of the !!fting rod extenslocs contacted two of the upper suppens that are part of the shroud modification assemblies. The purpose of this analysis is tojustify the adequacy of the long upper support design to withstand the contact load than the shroud head and separators assembly.

ANALYSIS l According to the sketch provided (71gure 1), the (3"x3.5") cross sectional area of the support bears the highest stresses (banding and shest) due to the contact load (P).

According to the refbrances I and 4 J...ir.gs, the shroud head and separators assembly plus the 48 shroud head boks weigh ((126.90 + (48) (0.312)] = 141.9 kips dry. In this calculadon, it is assumed that the total dry weight of the assembly impacted one of the long upper suppens at 103' and 2s3' azimuth locations. Using an impact fhetor of 1.25, the total load on the support is conscrystively assumed to be (141.9 x 1.25) = 177.40 kips.

According to the reference 2 drawing and the Figure 1 AUTOCAD sketch:

MOMENT ARM = 1.70 in (distance from mestive force)

SHEAR AREA = (3.0)(3.5) = 10.5 in' 8

f 1 (MOM. OF IN.) = (bh /12) = [(3.5) (3.0)'j/12 = 7.88 in' C (TO N A) = (h/2) = (3.0/2) = 1.5 in l

RCV BY:C0\1 ED + O-10-95 . 12:08 ENC BLIXi-. :027

, JtN 85 '95 078t"/PM GE NUQ.E M EERGY o,19 GENE-771 113-0695 REV. 0 Therehm, SHEAR STRESS = (177.4y(10,5) = 16.9 kai < .68g = (.6)(47.5)

= 28.5 kai BENDING STRESS = [(177.4) (1.7) (1.5)y(7.9) = 57.3 kpl < l.5 Sm

= 71.3 kai The upper support materialis X-750 (mbranos 2) and the value of Sm = 47.5 kai is the minimum value of Se at 550 *P per paragraph 3.3 of the rebrance 3 analysis. The 1.5Sm limit is alto estreated Som peregraph 5 of the schrence 3 analysis. The .6Sm ilmit is from ASME Section M EM= NB-3227.2,1989 Edition.

Since this conservative calculadora shows the maximum stresses to be below dwir allowables, it is ==4ul=I that the actual loads on tb two supports did not damage the compoesnts.

Note that dos to the nature of the shroud modi 6eedon design (reference 5), the shroud head and separator masambly load on top of the long upper support could not be transfered down into the lower componeasts of the ansamhly 0.e. tie red, yoke.....) causins axial compressive loading. The shroud head load was reacted by the sluoud flange.

Note also that the abroud bearing stress of((177.4y(3.4 x 3.5)) = 14.91 kaiis lower than the bearing allowable of Sy = 30.0 kai at 100*F The bearing stress allowable is from ASME Section M Subasadon NG 3227.1,1989 Edition, and the value of Sy for 304 is tom Appendix I of the same ASME code. The dimensions for the beanng area can be found in the rehrence 5 drawing.

Furthermore, this cornpressive fbrce on the shroud did not cause an overstress condition in the top Suide support plate. AcescOg to pages 17 and 18 of the reference 6 report, a ccsv.eeive load of 165.5 kips by the long upper supports creates a maximum Norrnal +

Upset (OBE) stress of 22.0 kal. Therefbre, the 177.4 kips compressive load on the shroud has crested approsdmately ([(177.4y(165.5)](22.0)) = 23.58 kst stress in the top guide support plass. This vabe is lower than the allowable of 1.55m = (1.5)(20.0) = 30.0 kai and thus it is acceptable. The 5m value of 20.0 kai ibt 304 shroud is kom Appendix I of the ASME Section M, Division 1.

RCV BY:C0\1 ED 6 10-05 : 12:09 ENC BLDG.  :#20

, AN 15 '95 07817PM GC ttG.E@ DEPGY P.20 Mwr 771-113-0805 REV.0 s .

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RCV BYiCOM ED' '0 7 10'-US~ + 12:09 .

ENC BLDd-. " #29 Sw N-oos-k Criteria Used to determine Impact fhetor.

References:

1. Whiting Crane Handbook. Whiting Corporation,1979.

2. Response to Request for Information on the Control ofHeavy Loads, Nov.

1981, Rev 1. Section 2.1.7.c no.13, page 2.1-12. Issued in response to Generic Letter 81-07.

3. AISC Code Section 1.3.3 Reference I and 2 providejustification for the use of1/2% impact for each ft per minute of crane speed with a minimum of 15%. The maximum crane speed for the reactor building 125 Ton c.rane ia 5 feet per minute. This would result in an impact factor of  !

2.5%. Reference 3 also r=w=nanda the use of25% as the impact factor for traveling I cranes and supports. Hence the use of 25% in the analysis for affect on the core shroud l

repair hardware is conservative as these values provide additional margin above required l

loads.

Prepared by: f Beardsley / /8-Desisn hei- ~

Approved b -

'dge t)V9h-Design Supervisor l

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