GO2-08-163, Response to Request for Additional Information Regarding Request 3ISI-09
| ML090070034 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 12/17/2008 |
| From: | Gambhir S Energy Northwest |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 3ISI-09, GO2-08-163 | |
| Download: ML090070034 (2) | |
Text
ENERGY NORTHWEST 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-northwesLcom December 17, 2008 G02-08-163 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 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION (RAI)
REGARDING REQUEST 31SI-09
References:
1)
Letter dated October 9, 2008, SK Gambhir (Energy Northwest) to NRC, "Inservice Inspection (ISl) Program Request 31SI-09"
- 2)
Letter dated November 14, 2008, CF Lyon (NRR) to JV Parrish (Energy Northwest), "Request for Additional Information Related to Request for Relief 31SI-09 (TAC NO. MD 9850)"
Dear Sir or Madam:
By the letter of Reference 1, Energy Northwest submitted Relief Request 31SI-09 for Columbia Generating Station. The request is to use an alternative to American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), Section Xl, Sub Article IWB-2500 to allow reduced percentage requirements for nozzle to vessel weld and inner radius examinations. Subsequent to submittal of Request 31SI-09, an RAI (Reference 2) was received from NRC staff reviewing the submittal requesting confirmation of two items. Energy Northwest's response is contained in the Attachment hereto.
There are no new commitments made in this RAI response. If you have any questions or require additional information, please contact MC Humphreys at 509 377-4025.
7pectfully, Lmhir Vice President, Technical Services
Attachment:
Response to RAI cc: EE Collins, Jr. - NRC RIV.
NRC Senior Resident Inspector/988C WA Horin - Winston & Strawn RN Sherman - BPA/1399 CF Lyon - NRC NRR
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RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING REQUEST 31SI-09 Attachment Page 1 of 1 Response to RAI In the letter of Reference 2, the staff requested that Energy Northwest confirm the following related to the welds that are listed in request 31SI-09.
A.
Previous ultrasonic testing results of the subject welds did not reveal any service induced indications.
CGS Response:
Ultrasonic testing examination results for each of the nozzle-to-vessel welds in Table 1 of request 31SI-09 were reviewed and it is confirmed that no service induced indications were revealed.
B.
The type of weld metal used in the subject welds is carbon/low alloy steel.
CGS Response:
The reactor vessel is low alloy steel plate specification SA-533 grade B class 1. The nozzle is low alloy steel forging specification SA-508 class 2.
The weld metal used in the welds specified in Table 1 of Attachment 1 to Reference 1 is carbon/low alloy steel.