ML20151Q088

Forwards Util Evaluation of NDE Programs & Activities at Plant.Programs & Activities in Compliance W/Applicable Codes & Requirements

ML20151Q088
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	06/07/1988
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8808110030
Download: ML20151Q088 (4)

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RECEIVED

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s Portland General ElechicCompany 8E010N V  ;

j David W. Cockfield Vice President.NucleM M 10 P2 39 ll June 7, 1988 Trojan Nuclear Plant ,

Dockot 50-344 l Licenso NPF-1 l l

Mr. J. B. Martin, Regional Administrator, Region V U.S. Nuclear Regulatory Commission )

1450 Maria Lane, Suito 210 Walnut Crook, CA 94596-5368 TROJAN NUCLEAR PLANT Evaluation of Nondestructivo l Examination Activities  !

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Dear Sir:

In Mr. D. F. Kirsch's letter of May 25, 1988, two technical concerns relating to nondestructivo examination programs and activities at Trojan l were described. Attached is our ovaluation of these concerns. In both  !

casos, we have concluded that our programs and activities are in compliance )

with applicable codes and requirements. l l

If you have any questions or concerns relating to our ovaluation, please do  ;

not hesitate to contact me at (503) 226-8897.  !

Sincerely, Attachment c: Document Control Desk U.S. Nuc1 car Regulatory Commission Mr. Bill Dixon State of Oregon Department of Energy Mr. R. C. Barr NRC Resident Inspector Trojan Nuclear Plant 8808110030 880607 e PDR ADOCK 05000344 f PDC ,

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121 S W Ea am he. recyn ceyn 97204 m -

. . Trojtn Nuclser Pitnt Mr. J. B. Martin Docket 50 344 June 7, 1988 Licenso NPF-1 Attachment Pago 1 of 3 Evaluation of Concerns Related To Nondestruction Examination Activities Concern l

Ultrasonic testing was not performed in accordance with ASME Section XI Articles III-4430 and III-3230(d). Specifically, theso sections of the code require use of 1/2 V methods and Trojan is not using this method for l applicable inspection activities.

Evaluation Based upon en evaluation of the concern and the code, it is concluded that ultrasonic testing (UT) is being performed in accordance with American Society of Mechanical Engineers (ASME)Section XI requirements including the one-half V examination methods and calibration. A discussion of the articles referenced in the above concern and other applicabic code sections is provided below.

Article III-4430 "Reflectors Transverso In Tho Wold Seam," requires that angle beam examinations for reflectors transvorse to the wold shall be conducted using a one-half V path. The UT examinations at Trojan comply fully with Article 11I-4430.

1 Paragraph (d) of Article III-3230. "Angle Boam Calibration," requires that side drilled holes (rather than notches) en the calibration block at 1/4 T and 3/4 T shall be used to determine the slope and shapo of the dictance amplitudo curvo (DAC), when the examination techniquo is limited  :

to tha one-half V path. It is our interpretation that this paragraph is j intended for the examination of materials whoso acoustic proporties do  !

not allow the use of calibration notches as described in Article III-3430, "Calibration Notches." Paragraph III-3230(d) should not be applied universally to all angle beam examinations for reflectors transvorso to the wold scam. This conclusion is based upon the following l information:

a) A more recent (1986) edition of the code (not yet formally incorporated in the Code of Federal Regulations) clarifies the intent of paragraph III-3230(d). The clarification is consistent with our interpretation. The revised code also adds l a new Paragraph III-3230(o) which specifies calibration requirements for scans with the beam directed parallel to the '

weld. This new paragraph (e) does not require sido drilled holes, but rather establishes calibration by setting the back surfaco notch at 80% of full screen height (FSH) with no j requirement for a DAC. '

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Trajan Nucis*r Pltnt Mr. J. B. M:rtin Dockst 50-344 June 7, 1988 Licenso NPF-1 Attachment Page 2 of 3 b) Our interpretation of this codo provision was discussed with Level III UT examinera with four different companies (two vendors and two consulting firms). All agroo with our code interprotation.

c) As further verification, the Chairman of the volumetric inspection working group of the ASME Section XI Subcommittee was consulted. He has also confirmed our interpretation of code requirements, d) The Introduction section of Appendix III, Paragraph (d) of III-1100 "General" states that alternative examination techniques and calibration block designs may be used as provided by IWA-2240 "Alternativo Examinations". IWA-2240 states that alternativo methods may be used provided the Trojan Nuclear Plant Inspector (i.e. , Authorized Nuclear Inservice Inspector

[ANII]) is aatisfied with the results of those methods. The ANII at Trojan reviews and accepts or rejects all inservice UT examination methods. Inservice UT examination methods being used at Trojan have been accepted by the ANII.

In addition PGE will request a code interpretation from ASME.

Concern Nondestructivo examination was not performed in accordance with the ASME Section XI Table IWB-2500-1, Item B8.20. Specifically, measurements of the pressurizer skirt weld should have included volumotric examination in addition to the surf aco method used.

Evaluation Based upon an evaluation of the concern as stated and a review of the referenced section of the code, wc havo concluded that nondestructive examination of the pressurizer skirt wold performed thus far in 1988 havo been performed in accordanco with ASME Section XI requirements.

The examination method column of Table IWB-2500-1, "Examination Categorie1," Item B8.20. "Pressurizer. Integrally Welded Attachments,"

requirec a volumetric or surface examination, as applicable. The Table '

does not require both methods to be used.

Within this portion of the code, several figures are provided which represent different attachmant wold configurations. Figure IWB-2500-13 lj "Integral Attachment Wold," most closely resembles the physical

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. Trojen Nuclear Plant

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Mr. J. B. Mirtin Dockst 50-344 June 7, 1988 Licenso NPF-1 Attachment Page 3 of

• configuration of the pressurizer skirt weld at Trojan. During the 1988 refueling outage, surface examination of side A-B (as depicted in the Figure) has been performed using magnetic particle methods. Surface C-D is not accessible for surface examination due to high radiation levels and physical. restrictions. The pressurizer skirt weld side C-D examina-tion will be rescheduled to be completed during the 1989 refueling outage, which is the end of this examination period (the first period of the second ten year inservice inspection interval).

The following three options for examination of the pressurizer skirt weld side C-D are under consideration:

a. Perform a surface examination of weld surfaco C-D, or

b. Develop a proceduro and perform a volumetric examination, or

c. Request an exemption from the NRC in accordance with Title 10, Codo of Federal Regulation, Part S5a, "Codes and Standards."

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