ML20091G346

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

ML20091G346
Person / Time
Site:	Quad Cities
Issue date:	06/15/1995
From:	Jahanian Y, Potter M, Svarney N COMMONWEALTH EDISON CO.
To:
Shared Package
ML20091G343	List: ML20091G339 ML20091G346 ML20091G356
References
GENE-771-111-06, GENE-771-111-0695-R0, GENE-771-111-6, GENE-771-111-695-R, NUDOCS 9507100065
Download: ML20091G346 (4)

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SNitOUD REPAIR PROGRAM FOR b.

QU AD CITIES UNIT'2 Shroud Head Contact on Upper Support GENE-7711110695 REV. O

{ DRP# B13-01740 Back-sip Calculations for FDDR# EE2-0505 June 15,1995 Propssed By: 1d-

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.EEERIEGE

1. 718E816 Rev. 6 GE Shroud Head and Seperstors D'rawing

2. 112D6541 Rev. 4 GE Upper SupportLong Drawing

3. GENB 771-681094 Quad Cities Shroud and Repair REV.O Hartiware Stress Analysis 4 919D611P001 Rav. 4 Quad Cities GE Shroud Hand Bolt Drawing

5. 112D5487 Rev. 6 Quad Cities GE Reactor, Modl6 cation A le==He%

. Drawing

6. GENE-77169-1094 Basimp Calculations for Quad Cities Shroud Repair REV.1 Shroud Stress Raport DESCRIPTION During inarmilatian of the shroud head and separstors assen:bly at Quad Cities Unit 2, two of the !!fting rod estensions contacted two of the upper supports that are part of the shroud

=~IL9 cation assemblies. The purpose of this analysis is tojustify the a%uacy of the long upper support design to withstand the contact load from the shroud head and separators assembly.

} ANALYMS According to the sketch provided (Figure 1), the (3"x3.5") cross sectional area of the i support bears the highest stresses (banding and shear) due to the contact load (P).

! According to the refbrances 1 and 4 drawings, the shroud head and separators assembly i plus the 48 shroud head bolts weigh ((126.90 + (48) (0.312)] = 141.9 kips dry. In this

! calculation, it is assumed tbst half of the total dry weight of the assernbly (141.9/2) = 71 l kips, contacted one of the long upper supps at 103' and 283' azimuth loacations.

i Note that conservatively the eSiset of buoyw; is not considered.

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

j MOMENT ARM = 1.70 in (distance fkorn rasctive fbrce) 2 SHEAR AREA = (3.0) (3.5) = 10.5 in i

! I(MOM. OF IN.) = (bh'/12) = [(3.5) (3.3)*]/12 = 7.88 in'

! C (TO N A) = (h/2) = (3.0/2) = 1.5 in i

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i SHEAR STRESS = (71.0y(10.5) = 6.8 kai .65m - (.6)(47.5)

= 28.5 losi 4

{ BENDING STRESS = [(71.0) (1.7) (1.5)y(7.9) = 22.9 kai 1.5.Sm ,

j =71.3kal

) The upper support matenalis X-750 (refersace 2) and the value of Sm = 47.5 kai is the

minimum value of Sm at 550 4 per paragraph 3.3 of the reference 3 analysis. This is a j conservative -=y.k-5 since the actual value of Sm is higher The 1.5Sm limit is also

! from paragraph 5 of the reference 3 analysis. The .6Sm limit is from ASME Section III, i Subsection NO 3227.2,1989 Edition j Since this calculation shows the maximum stresses to be below their allowables, it is l mehuled that the actualloads om the two supports did not damage the cornponents.

J Note that tiue to the nature af the shroud modification design (idor .ee 5), the shroud j head and sapsrators assernbly load on the top of the long upper support could not be

transferred dew z2o the lower components of the assembly (i.e. tie rod, yoke,....) causing .

{ axial compresave b% The shroud head load was reacted by the shroud fknge. l

} Note also that the airoud bearing strees of((71.0y(3.4 x 3.5)] = 6.0 kai is lower than the * ~

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allowable of Sy = 30 J kai at 1007. The beanns stress allowable is from ASME Section l l III Subsection NG4227.1,1989 Edition, and the value of Sy fbr 304 stainless xcel is from i Appendix I of the same ASME code. The dimensions for the bearing area are from the l reference 5 drawleg. '

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Furthermors, this compressive fbres on the shroud d!d rm cause an overstress condition in

! the top guide support piste. According to pages 17 and 18 of the reference 6 report, a j compresolve load of165.5 kips by the long upper supports creates a rnaximum Normal +

l Upset (OBE) stress of 22.0 kai. Thersfbre, the 71.0 kips compressive load on the shroud j created a lower stress in the top pide support plats and thus this loading is acceptable

The lifting rod / lug assembly does not need to be svahmied since its designed fbaction is to j bear the contact loads each time it is used.

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