ML20141D930

Approves of 840604 Response to Generic Ltr 84-11 Re Current Plans for Insp of Recirculation & RHR Piping Subj to Igscc. Submittal of Augmented Insp Program,If Appropriate, Requested

ML20141D930
Person / Time
Site:	Pilgrim
Issue date:	01/02/1986
From:	Zwolinski J Office of Nuclear Reactor Regulation
To:	Harrington W BOSTON EDISON CO.
References
GL-84-11, NUDOCS 8601070501
Download: ML20141D930 (3)

Text

'o UNITED STATES f[

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o NUCLEAR REGULATORY COMMISSION a wAsmmoiom, c. c. 20sss t  !

% January 2, 1986

%,,, , .e, Docket No. 50-293 Mr. William D. Harrington Senior Vice President, Nuclear Boston Edison Company 800 Boylston Street Boston, Massachusetts 02199

SUBJECT:

GENERIC LETTER 84-11, INSPECTION OF STAINLESS STEEL PIPING Re: Pilgrim Nuclear Power Station Our Generic Letter 84-11 (GL 84-11) requested licensees to address their current plans relative to inspections of recirculation and residual heat removal piping which is subject to intergra.1ular stress corrosion cracking (IGSCC). The letter also discussed leakage detection measures. We reviewed your response dated June 4, 1984 and found that it provided the appropriate information.

However, we noted your response to Item 1 of GL 84-11 that "If appropriate, an augmented inspection program of piping susceptible to IGSCC will be developed and submitted to the NRC for review prior to RF0 7." If you have concluded that an augmented inspection program is appropriate, please submit it for NRC review as soon as possible, so that any NRC comments can be i resolved without affecting the outage schedule.

Recently reported ultrasonic inspection results by various utilities have shown that the performance by qualified UT personnel lacks uniformity and consistency. To resolve this concern, the NRC has determined that all UT personnel performing detection and evaluation should be qualified by an up-graded program at the EPRI NDE Center. Therefore, we suggest that you contact the EPRI NDE Center to arrange for requalification of the UT personnel to be used during the 1986 outage.

The UT personnel performing inspection of overlay repaired welds should be trained and qualified at the NDE Center, using the demonstrated procedures and techniques.

The allowable flaw sizes in Code IWB-3640 are currently being revised to take account of the low toughness associated with flux welds. Pending publication of the revised IWD-3640, the staff has developed the following interim guidelines for use.of the present IWB-3640 to derive the allowable flaw sizes for flux welds:

(1) The secondary stresses (mainly thermal stresses) should be included in the calculation of the stress ratio.

0601070501 860102 PDR ADOCK 05000293 0 PDR

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Mr William D. Harrington January 2, 1986 (ii) The flaw size limits for the flux welds are 2/3 of the Code IWB-3640 allowables at a stress ratio as modified by (1).

Using the above guidelines, overlay repair may now be required for some unrepaired welds that were previously justified for continued service.

In the event you wish to discuss any of the above comments, please contact your NRC project manager.

Sincerely, Criglaal signed bya John A. Zwolinski, Director BWR Project Directorate #1 Division of BWR Licensing cc: See next page DISTRIBUTION Docket NRC PDR Local PDR PD #1 Reading RBernero OELD EJordan BGrimes JPartlow Pleech CJamerson ACRS (10)

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Mr. William D.- Harrington Boston Edison Company Pilgrim Nuclear Power Station cc:

Mr. Charles J. Mathis, Station Mgr.

Boston Edison Company RFD #1, Rocky Hill Road '

Plymouth, Massachusetts 02360 Resident Inspector's Office U. 5. Nuclear Regulatory Commission Post Office Box 867 Plymouth, Massachusetts 02360 Mr. David F. Tarantino Chairman, Board of Selectman 11 Lincoln Street Plymouth, Massachusetts 02360 Office of the Commissioner Massachusetts Department of Environmental Quality Engineering One Winter Street Boston, Massachusetts 02108 Office of the Attorney General 1 Ashburton Place 19th Floor Boston, Massachusetts 02108 Mr. Robert M. Hallisey, Director-Radiation Control Program Massachusetts Department of Public Health 150 Tremont Street Betten. "2::::ht::tt: 02111 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Mr. A. Victor Morisi Boston Edison Company 25 Braintree Hill Park Rockdale Street Braintree, Massachusetts 02184

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