ML17244A189

Proposes to Perform Radiographic Exam of Reactor Coolant Pump Casing Welds During 1981 Refueling & Maint Outage, Using Portable Linac X-ray Unit from EPRI Which Should Be Available in 1980

ML17244A189
Person / Time
Site:	Ginna
Issue date:	11/01/1978
From:	White L ROCHESTER GAS & ELECTRIC CORP.
To:	Ziemann D Office of Nuclear Reactor Regulation
References
NUDOCS 7811070182
Download: ML17244A189 (3)

Text

REGULA RY INFORMATION DISTRIBUT SYSTEM DOCKET NBR- 50-244 RE GINNA 1 DOC DATE: 781101 RECIPIENT: ZIEMANN D.L. ACCESSION NBR-7811070182 ORIGINATOR- WHITE L.D. COPIES RECEIVED:

COMPANY:

RO'CHESTER. GAS' ELEC LTR ENCL 0..

SUBJECT:

SIZE: 2 Proposes to perform radio r examination of rea'ctox'ool't um c sin welds durin 1982 refuelin 6 maintenance 'outa 'e usin ortable 'Lxnac X-Ray Unit by Elec Pwr Res Inst whi'ch."sho'uld be "avaz~labl'e 'in 1980.

CODE t 4001 NOTARIZEDISTRIBUTION DISTRJBUTION TITLE!

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TOTAL NUHBKR OF.COP IKS REQUIRED l

- LTR 00 ENCL 39

[goat 0 1978 NOTES I *

)r TOOE ROCHESTER GAS AHD ELECTRIC CORPORATION ~ 89 EAST AVE%DE, ROCHESTER, H.Y. 14649 LEON D. WHITE, JR. TEI.EPRONE VICE RRESIOENT ~REi COOE TIO 5 "6.2700 November 1, 1978 Director of Nuclear Reactor Regulation Attention: Mr. Dennis L. Ziemann, Chief Operating Reactors Branch /l2 U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Inservice Inspection of Reactor Coolant Pump R.E. Ginna Nuclear Power Plant Unit No. 1 Docket No. 50-244

Dear Mr. Ziemann:

On August 22, 1978, we requested relief from the requirement for the liquid penetrant examination of our reactor coolant pump casing welds.

This request was based on technical and radiation exposure justification.

Since that time we have had several telephone conversations with members of your staff. During these discussions we have reviewed the justifica-tion for not performing the liquid penetrant examination if an alternate

~ examination method was not available.

However, most recently we have reviewed the potential for performing a radiographic examination of these pump casing welds with equipment that is being developed by the Electric Power Research Institute. This new piece of equipment is a portable Linac X-Ray Unit which will have the capability of performing the required volumetric examinations of cast austenitic stainless steel weldments. Under the present schedule this system should be available in July 1980 in a field operable unit.

Therefore, if this equipment is available, we would propose to per-form a radiographic examination of our reactor coolant pump casing welds during our 1981 Refueling and Maintenance Outage in lieu of the liquid penetrant examination in 1979. The 1981 outage would be the second year of the first forty-month period of the second ten-year interval of our Inservice Inspection Program. A radiographic examination would meet the volumetric examination requirement of the ASME Boiler and Pressure Vessel Code Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components." This would also be in keepin with Rochester Gas and Elec-tric Corporation's philosophy of incorpor, pg<pew inspection techniques into the inservice inspection program as th yo'become available.

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ROCHESTER GAS AND ELEC IC CORP. SHEET NO.

DATE November 1, 1978 2 TO Mr. Dennis L. Zi,emann In planning for such an inspection, we would build a mock-up of the reactor coolant pumps so that prefabrication of insulation could be per-formed months ahead of the actual inspection. This effort should greatly reduce the radiation exposure outlined in our previous correspondence.

Also, we would run tests with the newly developed portable Linac X-Ray Unit on our pump bowl geometry to assure a proper examination. This would allow us to verify the signal to noise (source strength to background radiation) ratio we might expect when doing the actual examination.

Your prompt attention and response to this request would be appre-ciated. As you know, this job has major impact on our February 1979 Refueling and Maintenance Outage. If you have any further questions, please contact us.

Sincerely, Leon D. White, Jr.

LDW:bh