GO2-06-156, Supplemental Information Regarding Second Ten-Year Interval Request 2ISI-32-2

Supplemental Information Regarding Second Ten-Year Interval Request 2ISI-32-2

ML072840053
Person / Time
Site:	Columbia
Issue date:	10/02/2007
From:	Gambhir S Energy Northwest
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GO2-06-156, GO2-07-115, GO2-07-146
Download: ML072840053 (2)

Text

~~6 ENERGY NORTHWEST October 2, 2007 G02-07-146 Sudesh K. Gambhir Vice President, Technical Services P.O. Box 968, Mail Drop PE04 Richland, WA 99352-0968 Ph. 509-377-8313 F. 509-377-2354 sgambhir@energy-northwest.com 10 CFR 50.55a U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

Subject:

COLUMBIA GENERATING STATION, DOCKET NO. 50-397 SUPPLEMENTAL INFORMATION REGARDING SECOND TEN-YEAR INTERVAL REQUEST 21SI-32-2

References:

1)Letter dated July 30, 2007, G02-07-115, SK Gambhir (Energy Northwest) to NRC, "Response to Request for Additional Information Regarding Second 10-Year Inservice Inspection Interval Request for Relief 21SI-32" -2) Letter dated December .14, 2006, G02-06-156, WS Oxenford.(Energy Northwest) to NRC, "Second Ten Year Interval ISI Request 21SI-32"

Dear Sir or Madam:

In a September 19, 2007 teleconference between Energy Northwest and members of the Staff reviewing the subject request, information supplemental to the request was discussed.

This letter transmits that information to the reviewers and to the subject docket. The information needed for the reviewer's evaluation is as follows:* Energy Northwest recalculated the examination composite coverage of nozzle to vessel weld N18 using the examination volume of Figure IWB-2500-7(b) of the 1989 Edition of ASME Section XI. The total composite coverage was determined to be 63%." The results of all. 33 Category B-D weld examinations.

performed during the second inspection interval have been reviewed.

There were no unacceptable flaws identified by these examinations.

SUPPLEMENTAL INFORMATION REGARDING SECOND TEN-YEAR INTERVAL REQUEST 21SI-32-2 Page 2 There are no regulatory commitments contained in this letter. If you have any questions or desire additional information regarding this matter, please contact Mr. GV Cullen at (509) 377-6105.Respectfully, SK Gamibhir Vice President, Technical Services cc: EE Collins, Jr. -NRC RIV CF Lyon -NRC NRR NRC Senior Resident Inspector/988C RN Sherman -BPA/1 399 WA Horin -Winston & Strawn