ML20073C471
| ML20073C471 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 04/06/1983 |
| From: | Dixon O SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8304130176 | |
| Download: ML20073C471 (5) | |
Text
{{#Wiki_filter:4 0 I SOUTH CAROLINA ELECTRIC & GAS COMPANY POST OFT 4R 784 COLUMaiA. south CAmoLINA 29218 kJ '/ I. Zo ' c, y,
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g> g Y sv2.'d"o'I.Uf[on. April 6, 1983 Op* Mr. J. P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II, Suite 2900 101 Marietta Street, N.W. Atlanta, GA 30303
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Computer Analyzed Gap Requirements f or Guide Restraints Significant Deficiency
Dear Mr. O'Reilly:
South Carolina Electric and Gas Company's (SCE&G) final report dated September 15, 1982, on the subject significant deficiency, did not identify as one of the causes for the condition the misinterpretation of box guide gap requirements by craft and Quality Control personnel. This cause was addressed, however, in the original corrective action implemented for this deficiency. Attached Nonconformance Notice 149"3 was reviewed by NRC Inspector, Mr. Ang, who suggested that the final report be revised to include this information. This letter is a supplement to our final report on this deficiency and does not require any additional action. Very truly yours, s O. W. Dix , Jr. RBC:OWD/fjc cc: V. C. Summer D. A. Lavigne T. C. Nichols, Jr./O. W. Dixon, Jr. C. L. Ligon (NSRC) l E. C. Roberts G. J. Braddick H. N. Cyrus J. C. Miller Group / General Managers J. L. Skolds O. S. Bradham J. B. Knotts, Jr. R. B. Clary I&E Washington C. A. Price Document Management Branch A. R. Koon NPCF File (Lic./Eng.) 8304130176 830406 OFFICIAL COPYit PDR ADOCK 05000395 S PDR oL D
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s o L.* .*r l ,p. Attachment il to NCN 1497H I DETAILED DESCRIPTION OF NONCONFORMANCE: i I An independent audit of the EF system has identified pipe to support gaps in. excess of design and program requirements., The details are as follows (Current neasurements of field hardware are reported at the time of this NCN initiation): EFH-080: The 1/8 inch clearance in the vertical direction as shown on the support drawing actually measures 5/32. inch. ETH-099: The 1/8 inch max. gap shown on the support drawing (taken to be the sum of both gaps) actually measures 0 inch,at one angle and 7/32 inch at the other angle for a total of 7/32 inch. EFH-4020: The 1/8 inch max gap in the vertical direction as shown on the support drawing actually measures 5/32 inch. ( r DISPOSITION RECOMMENDATION: f I r It is reconsnended that Nuclear Engineering evaluate these conditions for acceptance or to provide detailed direction for gap rework. If*it is requested that furtner inspection of gaps on similar supports be performed,- then*it is expected that NE will identify such supports, provide direction on specific measuring tools and techniques to .A used, and establish appropriate acceptance criteria. l I j
4 m h,.** ti., '. ' .e r, PARTIAL DISPOSITION TO SCE&G NCN 1497H i Hangers EFH-080, 099 & 4020 shall be reworked to obtain acceptable gaps per approved procedures. Further inspection of gaps on similar supports shall be performed. NE provided QC with computer printout of V. C. Summer Pipe Supports - Sort by: Guides, Printout, dated 6/15/82. QC shall measure the gaps at the closest point of contact and provide any unaccep table '1,'::".... 1/^". _.' gap to NE for final disposition. I4);?p N/A7C YNIJ $747d*Dt/7 AMENDMENT TO PARTIAL DISPOSITION / 4 +r# 6/21/82 Acceptable gaps are gaps as shown . M. Klingaman Date l on Gilbert 04-4461-S-321-XXX Hanger Drawings. Tolerances as stated in CAI Erection Standards g 321-001, Sect. 3.5 shall also be (A da e / t applied. If gaps deviate from the above,QC will provide actual gaps to NE for evaluation. g y l H.,Radin DATT/ / j SCE&G Senior Engineer 4,M ' h - 6/23/82 L. M. 'klitigaman DATE GAI sident eer O QA ' I DATE' O Gb 3/ t-H. Radin DA'I'E [ SCE&G Senior Engineer
f)/7%dNA M / 70 4/C A/-/St 97f, south CAROLINA ELECTRIC &' GAS COMPANY i ,w.c .. ~. QUALITY CONTROL MANAGER CGSS-2195-QCM lo, fuel % NCN 1497H o. July 29, 1982 7. Mr. D. A. Lavigne a Ae w This letter is written to address the cause and corrective action associated with subject NCN. Where box guide type supports function as seismic restraints, the sum of gaps in either direction should have been limited to the range 1/8 inch maximum and 1/32 inch minimum; however,, nomenclature on the support drawings sometimes specified the tor.a1 gap to be 1/8 inch maximum. According to established criteria, where gaps were dimensioned on the drawings they were to override the concept as stated above. This appears to be responsible for some of the inadequate gaps identified as well as subsequent movement of pipes and excessive painting of pipe and hanger material. QC and Craft personnel have become sufficiently indoctrinated so that the sum of gaps (whether detailed as 1/8 inch max., 1/8 inch total, 1/8 inch max./1/32 inch min., 1/16 typical both sides, etc.) on box guides type supports are held to the range of 1/8 inch maximum to 1/32 inch hinimum where the guide functions as a seismic restraint. No further action on this behalf is necessary. c 4A e ; _. _- F. S. McKinnon 6 M. W. Clonts FSM/mrg cc: Mr. H. Radin Mr. N. Caudie Mr. F. McKinnon .TRS-File 7+a. ase.20 SCI}}