ML20137G459

Relief Request BV2-D2.20-1,Rev 0 to Svc Water Sys Welded Attachments

ML20137G459
Person / Time
Site:	Beaver Valley
Issue date:	03/12/1997
From:	DUQUESNE LIGHT CO.
To:
Shared Package
ML20137G377	List: ML20137G371 ML20137G408 ML20137G422 ML20137G435 ML20137G444 ML20137G455 ML20137G459 ML20137G465 ML20137G479
References
PROC-970312-05, PROC-970312-5, NUDOCS 9704010400
Download: ML20137G459 (7)

Text

{{#Wiki_filter:.. l6 l..,. e 2TYPP-1 l INSERVICE INSPECTION PLAN FOR THE FIRST TEN-YEARINTERVAL AT BEAVER VALLEY POWER STATION UNIT #2 RELIEF REQUEST BV2-D2.20-1, REV. O

SUBJECT:

Service Water System Welded Attachments 8 !d0 b 7 MM) Date: Prepared by: ^ Supenisor,' Inspection and Standards Resiewed by: 1-A #Ad Date: .3-II* 97 Director, Nuclear Analysis and Inspon Reviewed by: DE-b 'I7 Date: J//J /f 7 OSC Meeting No. Reviewed by: M u t. % M o. 91-i Date: c> /s 6 /<i7 ORC Meetidg No. 7 -/ 2 - 9 ) Approval by: c_c Date: Div. VP, Nuclear CTperations / P'lant Manager i 9704010400 970325 PDR ADOCK 05000334 0 PDR

DUQUESNE LIGHT COMPANY Beaver Valley Power Station Unit No. 2 RELIEF REOUEST NO. BV2-D2.20-1. Rev. O COMPONENT 2SWS-185-F-804 2SWS-185-F-808 2SWS-188-F-808 2SWS-185-F-805 2SWS-185-F-809 2SWS-188-F-809 2SWS-185-F-806 2SWS-188-F-520 2SWS-188-F-810 2SWS-185-F-807 2SWS-188-F-802 2SWS-188-F-811 ASME SECTION XI REOUIREMENT (83S83) Item No. D2.20 (IWD-2500-1, Category D-B) requires visual (VT-3) examinations of all integral attachments of component supports and restraints each inspection interval. REOUEST Duquesne Light Company (DLC) requests to conditionally implement Code Case N-509, " Alternate Rules for the Selection and Examination of Class 1,2, and 3 Integrally Welded Attachments Section XI, Division 1" as described in the following paragraphs. This request to implement Code Case N-509 at BV-2 as an alternative examination is in accordance with 10CFR50.55a(a)(3)(i) and footnote 6. Since the latest revision of Regulatory Guide 1.147 (rev. I1, dated October,1994) does not include this code case, NRC approval is necessary. This code case would be applied to Class 3 welded attachments only, for the current ten-year interval, ending November 16,1997. Class 1 and 2 welded attachment examinations, for the current interval, would continue to be based on the code of record (83S83). Approval to implement this code case is requested because oflimited access to 12 welds, located on 2 different service water system piping supports. These 12 welds are covered by insulation and surrounded by conduit and other piping. Access to perform the required examinations is not possible without removing the surrounding pipe and conduit to allow for insulation removal and the visual examination. These welded attachments are part of two separate piping supports located on 12" diameter,0.375" thick pipes. These pipes provide cooling water to the emergency diesel generator heat exchangers. Attached are drawings identifying the configuration of the supports and welded attachments. BACKGROUND The ASME Section XI Subcommittee has approved and published Code Case N-509. The latest revision of Regulatory Guide 1.147 does not include this code case. For Class 3 welded attachments, the code case requires examination of a 10% sample opposed to the 100% exam requirement of the ASME XI 1983 Edition, Summer 1983 Addenda (BVPS code of record). Justification of this code case was based on the costs, in both radiation exposure and dollars, associated with these examinations versus the added benefit of the examinations. Thejustification relied on industry operating experience associated with ISI of welded attachments over the last 20 years. This information was obtained through an extensive industry survey along with a Licensee

Page 2 of 2 Relief Reauest No BV2-D2.20-1. Rev. 0 Event Report search. The ASME XI Code originally established a visual examination requirement for Class 3 component supports and their welded attachments. These components were assigned a relatively low inspection priority (visual) because isolated failures were not generally considered a threat to plant safety. The ASME XI Code established these requirements on the welded attachments to preclude, by examination, occurrences of a stress induced flaw, initiating a failure of a pressure retaining component. Only one such failure has occurred in the industry. This failure was oflimited significance to the safety of the plant and caused no danger to the health and safety of the public. The failure was discovered when leakage was observed during normal operation and not by an ISI examination. JUSTIFICATION The BV-2 ten-year plan scheduled 428 Class 3 welded attachments for examination. Four-hundred and sixteen (416) welded attachments have been examined to date. All were acceptable. Thus,97% of the scheduled Class 3 welded attachments have been examined during the current interval. These examinations provide an adequate level of assurance of the integrity of this component category. Considering the past 20 years ofindustry-wide experience concerning welded attachments, removal of the surrounding piping and conduit constitutes hardship and unusual difficulty without a compensating increase in the level of safety. The 97% completion rate far exceeds the alternate mies of Code Case N-509 for a 10% sampling requirement. The examination results obtained on the 416 welded attachments are consistent with the industry experience compiled in support of the Code Case N-509. No defects were identified on the 416 examinations. Therefore, a 100% examination requirement is considered unwarranted due to the 1 absence ofidentified failures at BV-2 and throughout the nuclear industry. It should be noted that all of the BV-2 Class 3 welded attachment examinations performed to date were VT-3 examinations. Case N-509 requires a VT-1 examination for Class 3 welded attachments. This difference is not considered significant. The only condition specifically noted in IWA-2211 for a VT-1 examination that is not specifically noted in IWA-2213 for a VT-3, is cracks. If a crack was observed during a VT-3 examination, it would be reported since it impacts the general structural condition of the welded attachment. ALTERNATE EXAMINATION The alternate examination is to implement the sampling criteria of Code Case N-509 to the BV-2, Class 3 welded attachments for the current ten-year interval, ending November 16,1997. This requires examination of 10% of the welded attachments. Ninety-seven (97) percent of the total number of Class 3 welded attachments have been examined during this present interval. Approval of this alternative will preclude the hardship associated with efforts required to gain access to perform visual examinations on the remaining 3% of welded attachments (two supports). A best effort examination of these two supports was performed with the insulation installed. No deformation or any other anomaly was reported.

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