GO2-17-166, Response to Request for Additional Information for Relief Request 3ISI-19

Response to Request for Additional Information for Relief Request 3ISI-19

ML17276B587
Person / Time
Site:	Columbia
Issue date:	10/03/2017
From:	Javorik A Energy Northwest
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
3ISI-19, GO2-17-166, MF8925
Download: ML17276B587 (3)

Text

Alex L. Javorik ENERGY Vice President, Engineering P.O. Box 968, Mail Drop PE20 NORTHWEST Richland, WA 99352-0968 Ph. 509-377-8555 F. 509-377-4317 aljavorik@energy-northwest.com 10 CFR 50.55a October 3, 2017 G02-17-166 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001

Subject:

COLUMBIA GENERATING STATION, DOCKET NO. 50-397; RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION FOR RELIEF REQUEST 31Sl-19

References:

1) Letter, dated December 7, 2016, AL Javorik (Energy Northwest) to NRC, "Relief Requests for Limited Coverage Examinations Performed jn the Third 10-Year lnservice Inspection Interval"

2) Email, dated September 6, 2017, John Klos (NRC) to Lisa Williams (Energy Northwest), RAls for Columbia Relief Request RAI (MF8925), 31Sl-19 (ADAMS Accession No. ML17249A688)

Dear Sir or Madam:

By Reference 1, Energy Northwest submitted for approval relief request 31Sl-19.

Via Reference 2, the Nuclear Regulatory Commission (NRC) submitted Requests for Additional Information (RAls) to Energy Northwest. Attachment 1 provides the requested information.

This letter and its enclosure contain no regulatory commitments. If there are any questions or if additional information is needed, please contact Ms. L. L. Williams, Licensing Supervisor, at 509-377-8148.

I declare under penalty of perjury that the foregoing is true and correct.

Executed this 2. "~ay of 0 c f6' h ~ f', 2017.

Respectfully, tPj / ~.Al""".Alll~~~

lk Vice President, Engineering

G02-17-166 Page 2 of 2

Attachment:

As stated cc: NRC RIV Regional Administrator NRC NRR Project Manager NRC Sr. Resident Inspector - 988C CD Sonoda - BPA 1399 (email)

WA Horin - Winston & Strawn

G02-17-166 Page 1 of 1 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION (RAI)

NRC RAI 1:

Section XI, Article IWA-2220 of the ASME Code specifies the requirements for surface examinations.Section XI, Article IWA-2221 of the ASME Code requires that surface examinations performed using the magnetic particle method shall be conducted in accordance with Section V, Article 7 of the ASME Code. Please provide the applicable Code requirements for the surface examination of the Category C-C attachment welds (e.g. ASME Code Section V, Article 7.)

Energy Northwest Response:

Columbia's ASME required surface examinations for the third tnspection interval were performed in accordance with ASME Code Section V, Article 7 as required by ASME Section XI, 2001 Edition with the 2003 Addenda.

NRC RAI 2:

The licensee states that the "A" RHR system is subject to VT-2 visual examination during system pressure testing and that there were no recorded leaks during these pressure tests last interval. Since the Category C-C attachment welds are not pressure boundary welds, please explain how the system pressure test is relevant to determine the acceptability of the four Category C-C attachment welds.

Energy Northwest Response:

Columbia recognizes that the support welds are not pressure boundary welds. The function of the support is to support the weight and provide structural stability to the component. Reference to the VT-2 examination results were included as they provide some assurance that there is no weld defect in the inaccessible region of the support that resulted in through-wall leakage.