ML20205R395

List of Changes to Rev 0 to Failure Analysis of Essential Cooling Water Small Bore Aluminum Bronze

ML20205R395
Person / Time
Site:	South Texas
Issue date:	08/31/1988
From:	BECHTEL GROUP, INC.
To:
Shared Package
ML20205R372	List: ML20205R395 ML20205R408 ST-HL-AE-2748, Forwards Failure Analysis & Structural Integrity Evaluation of Leaking Small Bore Aluminum-Bronze Cast Valve Bodies & Fittings in Essential Cooling Water Sys, Per Corrective Actions in Essential Cooling Water Sys
References
NUDOCS 8811100017
Download: ML20205R395 (2)

Text

~ .

...... -- -~

~

H PAGE I OF 1.ist of Changes to Revision Zero of the Failure Analysis of the ECW Small Bore Aluminum Bronze Abst rac t Clarified thst report covered small bere piping.

Pa ge 1.1 In conclusion E, noted that beta as well as gamma 2 are susceptible to dealloying.

Pa ge 1.1 In conclusion F, removed reference to gamma 2 formation as this is not needed to have susceptibility to dealloying.

Pa ge 1.2 Deleted reference to Appendix A, as an Appendix A was not included in revision zero.

Pa ge 1.2 Added information of results of Nalco's microbiological analysis.

(

Pa ge 1.2 Deleted conclusion I as redundant. Combined conclusion J and K and relettered remaining conclusions.

Pa ge '1.2 In conclusion K (formerly M) added that beta phase is also susceptible to dealloying.

Page 1.3 Modified section A of Discussion of Results as a reexamination revealed that gacusa2 was not present in the ramples examined.

Page 1.3 Made parts 2 and 3 of Section A of Discussion of Results in Section B. Relettered following sections.

Pa ge 1.3 Clarified that pieces of Gallionella (not active) were found in crevices.

Pa ge 1.5 Removed ganna2 f rom metallurgical microstructure description as reexamination revealed only alpha and beta phases were present.

Pa ge 1.7 Corrosion product compounds were changed from for1nulas to names to avoid confusion.

Pa ge 1.10 Added correct figure to represent quenched structure.

Page 2.1 ne introduction was expanded to identify the organizations other than M&QS who contributed to the effort.

Also, deleted reference to Figures 2.1 and 2.2 as this was an error.

Pa ge 2.2 Clarified that non-leaking socket ends were estimated to be no note than 55 percent dealloyed. he 59.08 percent in revision zero was an earlier figure based on less data.

Page 2.4 Added reference to Table 2. 5.

AG11100017 801101 7 PDR ADOCK 05000478 i p FDC 3

-- )

- a n__

HL E-List of Changes (cont'd) L PAGE E O ,

Page 2.4 Equations 9 and 11 were corrected as some errors introduced during typing were missed in revision zero.

Also, added reference to Figure 2.7 and changed reference from Figure 2.5 to Table 2.4.

Pa ge 2.5 Changed reference from Fi::ure 2.5 to Table 2.4. Also, deleted reference to 'lable 2.4 in another place.

Page 2.5 Deleted second parar,raph under Section 2.4.1 and the first sentence in 2.4.2 tecause, although the alpha phase of aluminum bronze is face cratered cubic and thus similar to 304 stainless steel, the 952 .:nd 954 aluminum bronze alloys contain 3 significant amounts of beta phase which is body centered cubic.

Page 2.6 Revised to add crack tip opening displacement (CTOD) data measured after Revision 0 of this report was issued. The value A used for calculation in the report (65 ksi-ini/2 le et th. /3\ -

low end of the range measured (63.5 - 95.1 kei-inl /2) for the 954 alloy. As noted in the text, the valves are made of the 954 alloy, whereas the fittings are of the 952 alloy. The 952 alloy is expected to have better toughness on average than the 954 alloy because it should have less beta phase because of the lower specified aluminum content.

Page 2.9 Added explanations for symbols used in burst pressure equation.

Pa ge 2.13 Corrected materials to state couplings are 952 alloy and valves are 954 alloy.

b Page 2.17 Made bend stress curve from 38 kai to zero dotted to clarify and 2.18 that it is not governing at those stresses. Removed rising curves because they cluttered figures and were not needed.

Page 2.19 Deleted "TO ALLOWABLE" from title of Figure 2.4.

Page 2.22 Added Figure 2.7. This was in the handout given to the NRC but (and Contents) inadvertently lef t out of the written report.

Added Appendix with results of CTOD tests i

v