ML20215J614
| ML20215J614 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/15/1987 |
| From: | Carey J DUQUESNE LIGHT CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 2NRC-7-082, 2NRC-7-82, 86-17, NUDOCS 8705080151 | |
| Download: ML20215J614 (3) | |
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2NRC-7-082 Beaver Valley No. 2 Unit Project Organization S.E.G. Building Telecopy (
)
3-5 Ext.160 P.O. Box 328 April 15, 1987 Shippingport, PA 15077 United -States Nuclear Regulatory Commission Region I 63I Park Avenue King of Prussia, PA 19406 ATTENTION:
Dr. Thomas E. Murley Administrator
SUBJECT:
Beaver Valley Power 5tation - Unit No. 2 Docket No. 50-412 Lack-of-Fusion Weld on Regenerative Heat Exchanger Potential Significant Deficiency Report 86-17, Final Report Gentlemen:
This Potentially Reportable Significant Deficiency Report is being submitted pursuant to the requirements of 10CFR50.55(e).
It is anticipated that no additional reports will be required.
DUQUESNE LIGHT COMPANY
/
By
'J. J."Carey Sr. Vice President LMR/ijr NRC/LMR/SDR/8617 Attachment AR/NAR cc:
Mr. P. Tam, Project Manager (w/a)
Mr. J. M. Taylor, Director (3) (w/a)
Mr. J. Beall, Sr. Resident inspector (w/a)
Mr. L. Prividy, NRC Resident Inspector (w/a)
INPO Records Center (w/a)
NRC Document Control Desk (w/a) 8705080151 870415 PDR ADOCK 05000412 S
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ATTACHMENT 1.
Summary While _ performing a pre-service examination -(ultrasonic) _ of the regen-erative heat exchanger girth welds, two welds were found to contain L
ultrasonic reflectors requiring r e-ev al uation... The indications on these welds were identified, repaired and accepted in accordance.with the existing quality progran. During the course of the initial inves-tigation, a review of the radiographs furnished by the vendor for these welds was performed in an attenpt to correlate the ultrasonic indications with the indications on the radiographs.
During the course of.this review, these welds were found to have linear indica-tions which would appear to be unacceptable to ASME Section 111.
As a
. result, the remaining radiographs on the regenerative heat exchanger were reviewed.
Two additional welds were found to have areas which would appear. to be unacceptable to ASME Section 111.
During this initial review, a total of four (4) welds were found to have linear indications.
2.
Immediate Action Taken A Nonconformance and Di sposition Report was initiated to identify Duquesne Light's concern regaroing the indications found on _the vendor supplied radiographs, and to deterinine the extent of the inconsisten-ties in dates in the supporting documentation.
Mr. L. M. Ra5enau, Compliance Engineer - Beaver Valley Unit 2, noti-fied W. J. Shediosky, NRC Region 1 of this concern on December 30, 1986.
An interim report, 2NRC-7-018, was issued on January 29, 1987.
3.
Description of Deficiency Two of the welds referenced above which appear to have linear-indica-tions on the radiographs, were re-radiographed by DLC.
One of these welds was determined to have lack-of-fusion.
The other weld was acceptable.
The other twa welds have not been re-radiographed due to tube bundle interference.
The inconsistencies noted in the supporting documentation, supplied by Joseph Oat and Son,.Inc., include items such as reader sheets being reviewed and approved prior to radicgraph dates, and the N-1 Data Report being signed prior to all welds being r adiogr aphed.
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' Analysis of Safety Implication
. The vessel was fabricated in accordance with the ASME Boiler and Pressure Vessel Code,Section III,1974 Edition, Subsection NC.
As such, a lack-of-fusion constitutes an unacceptable weld.
For the inconsistencies in the supporting documentation, the impact on safety will depend upon the outcome of review of these inconsisten-cies.
5.
Corrective Action Nonconformance and Disposition Report 29986 was dispositioned to Accept-As-Is girth welds ISID #2, 7 and 11.
This is based on the Westinghouse supplied letters of correction.and clarification, and acceptance by the DLC/QA NDE Level III examiner.
The inconsistencies in the supporting documentation were dispositioned (N&D 29986) to Accept-As-Is based on the response provided by Westing-house, which evaluated the data and found it acceptable.
The above items were covered under ASME Section III.
For girth weld ISID #8, the disposition (N&D 29986) was to repair the weld under the requirements of the ASME Section XI Repair and Replace-ment Program as defined. in Field Construction Procedure (FCP) 221,
" Repair, Replacement and Modification of N-Stamped Components Under Jurisdiction of ASME XI."
The weld has been ' repaired and inspected satisfactorily, the regenera-tive heat exchanger has been hydrostatically tested satisfactorily, and N&D 29986 has been closed.
6.
Additional Report No Additional-Reports are expected.
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