ML20086T224

Boston Edison Pilgrim BWR Plan RWCU Sys Evaluation of Crack Growth & Stability for 4-Inch Pipe to Elbow Weldment

ML20086T224
Person / Time
Site:	Pilgrim
Issue date:	12/19/1991
From:	AEA O'DONNELL, INC. (FORMERLY SMC O'DONNELL, INC.
To:
Shared Package
ML19351B055	List: BECO-91-154, Informs of Plans for Repairing Leak in RWCU Sys.Copy of Calculation Used to Perform Evaluation of Crack Growth Propagation Encl.W/One Oversize Drawing.Drawing Withheld ML20086T224
References
2216-402-002.00, 2216-402-002.00-R00, 2216-402-2.00, 2216-402-2.00-R, NUDOCS 9201060175
Download: ML20086T224 (7)

Text

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B05 TON EDISON PILERIN BWR PLAM REACTOR WATER CLEAMIP $YSTEM s ..

Evaluation of crack Growth "

and $tability for a 4' Pipe to Elbow Weldsent C

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Prepared By/Cate

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Evaluation of Crack Growth and $tability for a 4* Pipo to Elbow Weldat

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l Crack Stability Resulti _

l The resv'ts of the stability calculations are shown graphically in Figure 1= i These results are based on the fcilowing pipe stresses: l Pressure stress - 3505 psi e Deadweight stress = 130 psi Pm = 3635 psi (Pn will based on the Pres + Deadwt stresses)

Thermal stress e 1226 psi Fitup offset stress - 745 psi (20% of the Thermal stress) j Po - 1471 psi (Pe will be based on the Thermal 4 '

Fitupstresses) f The curves snown in Figure 1 shcw the region of stable crack gr4wth based on '

the requironants in Section XI of the ASHC Code. These calculations include safety factors (3F) as shown on the figure. Th6 SF of 2.77 is frr Normal  ;

loacs and the SF of 1.39 is for Emergoney loads. These factors a safety ..

I are conservatisms that are include 0 in the calculations per the requirernents of the ASME Code.

Tne most conservative or Icwer bound result is obtained using a SF of 2.77.

For r is case the data used in plotting the figure indicate that a maximum

- crat- 1ength of 51.4% (of the circustrerence) is acceptable. As noted on the

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ft;ure, tne current length of the crack 15 41.4%. This indicates that the l Crack is currently stable, even based on the Section XI methodnicgy which 'I

-conservatively includes the factors of safety mentioned above. m_

m.

Using the results from figure 1, the amount of crack growth restaining before the conservative criteria of Section XI is exceeded is;

(!1.4% + 41.4%) = 10.0f. cf the inside circumference

= 1.20 inches e

.cract powt,_ siculations

• Tne crack growth evaluation will be cased on data available for pipe (i.e.,

cylindrical) geometry. The appilcable relationship for the stress Intensity y

- fattor (K) 1s as folicws:

K=(5t)(Ft)8a; 5t = Tensile stress f t = Yariable cylindrical correction factor

- 2.5 for a crack length of 40% _

- 3.4 for a crack length of 50%-

For the present calculations it is conserva-tive to use a valua of M gw l

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I l-22.1/, - 402. - 002,o o @

m tyle!0c lit-II-it 110tii M i At!!:ti!0ta 09AMTRig 4th fdOHis 4 l

a

d. .,

a = 1/2 the crack arciength. To tre conservative the cr&Ck length will be t&kan 48 the maxi.

fru'l stable length which was calculated aboyt ,

= ($1.4f.)/2 .

• 3.09 inct.es '4 -

r=l3.535+1.471)(3.4)/i[TTiI)

= .4.1 kst/la The crack growth relatiership will be trAen from NURCC.0313. Figure 2. This I expressior and the resulting crack growth rate are as follows: i (da/dt)=3.59x10'x(X8.888) inch / hour a .000200 Irch/ hour since the crack can be expected to grew from both ends, the total extension of tre crack will be taken as twice the rate detennined above. L' sing'the l.a. 1.t lea;th available allo'=able operating for stable tiine (18)crac< can growth as computed te determined. above (latio,n is ), an This calcu provided belows ,

Ta . Allowable operating time -

= Javailable crack lengt /2(ds/<it)

- dt.2 in.)/(2 x .000200 ) Y ( # ^'* f )

= 3000 hours0.0347 days <br />0.833 hours <br />0.00496 weeks <br />0.00114 months <br /> = 17.9 week ,

This result is a conserystive estimation for the time the piping can be operated before the Section XI crack stability criteria are exceeded.

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. t ATTACHMENT 3 .

Page 1 of 1 l Regl For . i

.5 Valve Approx.(4) Motor Required Factor TST (2) Stall 801 Operator j Valve Size . Type- aP :or NRC Test Avaliable Voltace Max (3) OR/S.E.:S.F. (.2)  !

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i 1201-2 Gate 6" Flex 1135 12000(1) 11515 14900 16800 52.2/.5/.0168  ;

Halworth-(AC) Hedge SMB-00-15 3

1201-5 Gate 6"- Flex 1135 21000(1) 17300 24800 28800 43.69/.5/.0210 l Anchor / Darling Hedge  ;

(DC)'SMB-0-25 -

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{- (1) Approximate from USNRC (INEL) Tests, other valves not tested J

(2) Torque Switch is bypassed for 987. of closed stroke. The thrust values do not include VOTES error band MOV Users Group i -- (Draft) report shows 4.37. average at torque switch trip.

(3) Design + 207. F r

(4) AC is 0.64 x Stall. DC is 0.8 x. Stall

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