ML19322A289
| ML19322A289 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/29/1979 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19322A288 | List: |
| References | |
| NUDOCS 7903300455 | |
| Download: ML19322A289 (3) | |
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METROPOLITAN EDISON COMPANY sussiciany of aerienst ovatic uritiries conpanar:as l POST OFFICE BOX 542 READING, PENNSYLVANI A 19603 January 29, 1979 TELEPHONE 215 - 929-3601 GQL 013h Office of Inspection and Enforcement Attn:
B. H. Grier, Director Region I U.S. Nuclear Regulatory Co=issien 631 Park Avenue King of Prussia, Pennsylvania 19h06
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-1)
Operating License No. DPR-50 Docket No. 50-289 Inspection Report 78-26 Included with the subject Inspection Report, received under your letter of January 9,1979, was a notice of an apparent violation based on the results of Mr. R. A. McBrearty's inspection of TMI-1 on December 12-lh,1978. A description of the apparent violation and Met-Ed's response are attached.
Sincerel',
I J.
Herbein Vice President-Generation JGH:WSS:jdp Attachment 7903300455 1
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Metropolitan Edison Company Three Mile Island Nuclear Station, Unit 1 Docket No. 50-289 License No. DPR-50 Inspection No. 78-26 Apparent Infraction:
During the inspection conducted on December 12-14, 1978, the follovi g apparent item of noncompliance was identified. This item is an infraction.
The Three Mile Island, Unit 1 Technical Specification h.2.1 states, in part,
"...The inservice inspection program is in accordance 4th the ASME Code,Section XI,... dated January 1, 1970, as modified by the Winter 1970 Addenda."
ASME,Section XI, Paragraph IS-213.2, states, in part, 'Mtrasonic examination,...
shall be conducted in accordance with provisions of Appendix IX,... of Section III."
Appendix IX,Section III, Paragraph IX-3h6, states, in part, "The nominal frequency shall be 2.25 MHz..."
Contrary to the above, the data included in data sheet 018-23 and 018-28 documented that on April 5 and 6,1978, feedvater piping veld W-W-1 and weld W-W-2 were examined using a 3 5 MHz transducer pulsed at 5 0 MHz and hydrogen purge piping veld HP-W5 was examined using a 5.0 MHz transducer pulsed at 2.25 MHz.
On March 25, 1978, steam generator "A" lower manway studs SGa-17M through SGa-32M and pressurizer heater bundle studs PRb-01M through PRb-16M were examined using an examination frequency of 5.0 MHz as documented on data sheet 020-1 and 020-2.
Met-Ed Response to Infraction:
Met-Ed has reviewed the examination records cited in Inspection Report 78-26 with Nuclear Energy Services, Inc., the Inservice Inspection Examination Contractor for Three Mile Island Unit 1, and provides the following justification:
When performing the examination of Feedvater piping velds W-W1 and W-W2, a 3.5 MHz transducer was used in order to obtain increast:d resolution. The search unit selected was fitted with a delay tip, which diminishes metal surface reflected signal for improvel near-surface resolution. Since the instrument used is not equip 1.ed with a 3 5 MHz pulse frequency setting, a 5 0 MHz setting was used. The examiner adjusts instrument frequency setting as required to achieve optimum re-sponse when preparing for initial calibration. A satisfactory calibration was obtained. Met-Ed censiders that the inspection was conducted in a manner technically consistent with the ASME Code and concludes that the inspection was satisfactory.
This justification for use of a frequency other than the nominal 2.25 MHz vill be documented on the data sheet as allowed by the ASME Code.
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The use of a 2.25 MHz instrument pulse setting driving a 5.0 MHz search unit in examination of Hydrogen Purge piping veld HP-W5 is technically justifiable since a astisfactory calibration was obtained.
It is concluded that this inspection was adequate and again this justification vill be documented on the HP-WS data sheet.
Steam Generator lower manvay studs SGa-lTM through SGa-32M, which were examined on March 25, 1978, were later removed.
Replacement studs were UT examined at the normal 2.25 MHz frequency. Full compliance was achieved with the installation of the replacement studs.
Small diameter bolting often presents a resolution difficulty due to the reflected signal from the thread surfaces. To increase resolution, higher search unit and instrument pulse frequencies are generally used. A 5 MHz search unit and 5 MHz instrument pulse frequency was therefore used on Pressurizer Heater Bundle studs PRb-OlM through PRb-16M. This technically valid reason and the fact that a satis-factory calibration was obtained justifies the use of other than a nominal 2.25 MHz exam hation frequency. This justification will be recorded on the data sheet.
The foregoing justifications will be placed in the examination records with the appropriate data sheets. In addition, the examination contractor vill be in-structed to document on data sheets justification for frequencies other than the code required nominal examination frequency of 2.25 MHz. Full compliance vill be achieved by February 23, 1979 1
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