From:	Peter Titus
Sent:	Tuesday, August 09, 2011 4:38 PM
To:	Mark Smith; Irving J. Zatz
Cc:	Phil Heitzenroeder; Bob Simmons
Subject:	PF2 and 3 coil and support analysis
Attachments:	PF2Support2-Zatz-b.doc

I did a bit more on the bolting issue. It is complicated by the fact that the bolts are preloaded against 
pipe spacers and/or the coils - The spacers were probably intended to limit compression in the coils. - 
but we will need to ensure both the spacers and coils are clamped. I calculated the fatigue life of the 
stud threads if only the spacers are compressed. The new 304 high strength studs will survive the 60,000 
shots at the max uplift loading for the 96 scenarios. If the coils are properly clamped the alternating 
components go way down. I revised the DCPS section to limit the loading to 20ksi with no check on 
fatigue and 47ksi (for the new studs) for infrequent loading. Anything that goes above 20 ksi will require 
the DCPS to cycle count. 
The new section on bolting is 8.2
 
Also I added a suggestion to add bolts to the support clamp of PF3. The plate is welded to the ribs with 
1/8 inch welds. I have included some of Martin's results that qualify the  1/8 inch fillets but pointed out 
that because only four bolts were used, the loads in the welds concentrated near the bolts. and bigger 
weld were still needed. If you add 8 bolts per support, the welds will be uniformly loaded and the welds 
would not need to be upgraded. 
 
-Peter