ML19340B831

Responds to NRC 800821 Ltr Re Permitted Exemptions Per IWB-1220(b)(1) of ASME Code,Section 11.Alleges Current NRC Interpretation Differs from Previous Yrs.States Position Re Pipe & Weld Joint Exemptions to Resolve Discrepancy

ML19340B831
Person / Time
Site:	Zimmer
Issue date:	11/04/1980
From:	Flynn J CINCINNATI GAS & ELECTRIC CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
NUDOCS 8011120385
Download: ML19340B831 (2)

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h5?  :::,Y THE CINCINNATI GAS & ELECTRIC COAf PANY A #N CINCINN ATI C HIC 4 5201 Docket No. 50-358 November 4, 1980

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Mr. A. Schwencer, Chief

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9lgs; s  ;:gr Licensing Branch No. 2  :?  : , er, Division of Licensing Ljf U.S. Nuclear Regulatory Commission m co

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0 Washington, D.C. 20555 $f iS RE: WM. H. ZIMMER NUCLEAR POWER STATION -

UNIT 1 - PERMITTED EXEMPTIONS UNDER IWB-122 0 (b) (1) OF SECTION XI OF THE ASME CODE

Dear Mr. Schwencer:

This is in reply to your letter of August 21, 1980.

Subsequent to the receipt of the above letter, we have done con-siderable review of the referenced subject. We believe that the current NRC Staff interpretation of the 1974 Edition of Section XI differs from previous NRC Staff interpretations. In the interest of resolving this matter, however, we are taking the following position:

1. The limiting pipe diameters for exemption under IWB-1220 (b) (1) will be revised to 1.11 in, for water and 2.22 in, for steam in accordance with NRC calculations.

2. Ten (10) additional lines will be inspected using the revised exemption diameters; this will involve the inspection of approximately 170 additional weld joints on Class I piping.

3. Since many of the welds in Item 2 above have socket weld fittings and ultrasonic testing is generally impractical, the additional welds referenced above will be given a surface examination (PT).

4. A surface examination of the additional weld joints is consistent with_the Zimmer ISI Program Plan which is being prepared in accordance'with the 1977 Edition of Section XI with Addenda through Summer 1978.

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!O 8011120 385 O

To: Mr. A. Schwencer, Chief November 4, 1980 Re: Wm. H. Zimmer Nuclear Power Station - Page #2 Unit 1 - Permitted Exemptions Under IWB-1220 (b) (1) of Section XI of the ASME Code matter.

dr. Litton of the NRC Staff is familiar with this Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY

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gl}rn JAMES D. FLYNN, Manager Licensing and Environmental Affairs JDF: dew cc: Charles Bechhoefer Glenn O. Bright Frank F. Hooper Troy B. Conner,1Jr.

James P. Fenstermaker Steven G. Smith William J. Moran J. Robert Newlin William G. Porter, Jr.

Earl A. Borgmann F, T. Daniels M. Peter Heile Leah S. Kosik John D. Woliver Mary Reder David-X.. Martin Robert'A. Jones Andrew B. Dennison