Re: Davis-Besse corrosion?

["Steve Schulin" <schulin@Capaccess.org>]

An early draft portion of Davis-Besse's root cause team report, dated

March 22, points to boric acid corrosion after the cracking: "The factors

that aused corrosion of the RPV head in the regions of nozzles #2 and #3

are the CRDM nozzle leakage associated with through-wall cracking,

followed by boric acid corrosion of the RPV low-alloy steel." The excerpt

also notes, in part, that "The potential for significant corrosion of the

RPV head as a result of accumulating boric acid and local leakage was not

recognized as a safety significant issue by the staff and management of

the plant. The lack of understanding of this was a CAUSAL FACTOR."

(emphasis in orginal)



Ref: Probable Cause Summary Report for CR2002-0891, Significant

Degradation of the Reactor Vessel Head Pressure Boundary. March 22, 2002.

S. A. Loehlein, Root Cause Team Leader --

http://www.nrc.gov/reactors/operating/ops-experience/vessel-head-degradation/vessel-head-degradation-files/db-probable-cause-summary.pdf



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