ML18030A045
| ML18030A045 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 04/21/1981 |
| From: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, PLA-711, NUDOCS 8104240439 | |
| Download: ML18030A045 (6) | |
Text
REG
<ATORY INFORMATION DISTRIBU ON'YSTEM (RIDS)
ACCESSION NBR:8104240439 DOC ~ DATE: 81/04/21 NOTARIZED:
NO DOCKET ¹ FACIL'.50 387 Susquehanna Steam Electric Stationr Unit ir Pennsylva
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.0009'0.
38S Susauehanna Steam Electric Stations Unit 2r Pennsylva <05000088 AUTH'AME' AUTHOR AF FILI AT'ION CURTISr N ~ W ~
Pennsylvania Power 8, Light-Co,
- RECIP ~ NAME>>
REC IPIKNT AFFILIATION GRIERr B ~ H ~
Region lr Philadelphiar Office of the Director SUBJECT! Final deficiency reptior iginal 1 y r epor ted on 800520rre impi oper use of stress isometric dr awings for instal lat{oni identification 8 insp of pipe suppor ts,Caused by lack of design output infoiBechtel will issue: monthly updates, DISTRIBUTIoN CODEt 80198 COPIES RKCEIVEDsLTR ENCL SIZE" TITLE'onstruction Deficiency Report (10CFR50
~ 55E)
NOTES:Send IR,E 3 copies FSAR 8 all amends'end ICE 3 copies FSAR 8 all amends; 050003S7 05000388 RECIPIENT'D CODE/NAME~
ACTION!
A/0 LICENSNG 04 RUSHBROOKrM ~
06 INTERNALS ASLBP/J:,HARD EDO 8
ST'AFF 19 HYD/GEO BR 22'.
OELD 21 QA BR 14, RUTHKRFORDrW HAIK COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
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RECIPIENT ID CODE/NAME LIC BR ¹2 BC 05 STARKrR ~
07 D/DIR HUM FAC15 EQUIP QUAL BR11 ILE'-
09 LIC QUAL BR 12 NRC PDR 02'R REV 13 EG FI K
Oi T'O'NIMD D E Y 2 1 COPIES LTTR ENCL 1
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1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 EXTERNALS ACRS NSIC 16 08 16 16 1
LPDR 03 1
1
@~ ~ ~ l>>3>>N1 TOTAL NUMBER OF COPIES REQUIREDt LTTR 38 ENCL 38
TWO NORTH NINTH STREET, ALLENTOWN, PA. 18101 PHONEr (215) 770 5151 NORMAN W. CURTIS Vice President
~ Engineering 1L Construction-Nucleer 770.5381 April 21, 1981 Mr. Boyce H. Grier Director, Region Z
U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 Ogk 0+
SUSQUEHANNA STEAM ELECTR1C STATZON FZNAL REPORT OF A DEFZCZENCY RELATZNG TO USE OF STRESS ZSOMETRZCS TO LOCATE PZPE SUPPORTS ER's 100450/100508 FZLES 840-4/900-10 PLA-711
Reference:
PLA-486 (5/20/80)
Dear Mr. Griers This letter serves to provide the Commission with a final report of a deficiency relating to the use of uncontrolled stress isometric sketches to locate pipe supports.
This deficiency was originally reported in PLA-486 and the information contained herein is submitted as a final report pursuant to the provisions of 10 CFR 50.55(e).
The attachment to this letter contains a description of the problem, its
- cause, safety implications, and the corrective action taken and planned to preclude recurrence.
We trust the Commission will find the information forwarded by this letter to be satisfactory.
Very truly yours, WHG/RASssab Attachment 8 3.0.42:40 939 PENNSYLVANIA POWER 3
LIGHT COMPANY N.
W. Curtis Vice President-Engineering
& Construction-Nuclear pot~
5it
Mr. Boyce H. Grier April 21, 1981 cc:
Mr. Victor Stello (15)
Director-Office of Xnspection 6 Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. McDonald, Director (1)
Office of Management Information a Program Control U. S. Nuclear Regulatory Commission Washington, D.C-20555, Mr. Gary Rhoads U. S. Nuclear Regulatory Commission PRO.
Box 52 Shickshinny, PA 18655
Attachment to PLA-711 l.
Entroduction This deficiency relates to the improper use of st ess isometric drawings for the identification, installation and inspection of pipe supports required within a pipe support system.
2.
Descri tion of Problem and Safet Implications Stzess isometxics are defined as internal Bechtel Engineering design coordination documents used to define pipe stresses under various loading conditions and to provide load definition for the performance of pipe support design.
This pipe support design activity results in pipe support detail drawings which when "Approved for Construction," are issued to Bechtel Construction for pipe support fabrication< installation and inspection.
A pipe support detail drawing provides the required information to locate, fabricate and install a unique pipe support.
Stress isometrics are not "Approved for Construction" nor are they intended for, use in fabrication, installation or inspection of pipe supports.
The deficiency was the improper use of pipe stress isometric drawings by Bechtel Field Engineering in the absence of suitable design information issued for construction to identify - to Bechtel Quality Control - those pipe hangers required to support a given piping system.
As described
- above, the stress isometric drawings present conceptual
~desi n information in terms of support systems for piping and therefore should not be taken as representative of the support system as designed and issued for construction at any given time in the pipe system installation and inspection process.
Zt was determined that the use of stress isometrics to accomplish Quality Control inspections for piping systems was a direct consequence of Engineering's failure to issue design configuration information sufficient to facilitate the identification of pipe supports required in a given system.
This could have adversely affected the quality of installed safety related systems.
3.
Cause of Deficien The improper use of stress isometrics was caused by a lack of sufficient design output information issued to the field forces to accomplish identification of the intended pipe hanger systems'onfigurations.
Because of the difficulty encountered in identifying and assembling all the various design documents required to completely define the required pipe hanger configuration, field forces elected to use the stress isometrics.
Stress isometrics had been transmitted to the jobsite by Bechtel Project Engineering for Field Engineering "information only".
Attachment to PLA-7ll 4.
Corrective Actions To facilitate the process for field determination of required pipe system support configurations, Bechtel Project Engineering has issued, and has committed to provide monthly updates of, indices showing the pipe upport design drawings and their current revisions issued in support of any given piping system.
With this new design configuration information, the field forces will be able to readily assemble the individual pipe support fabrication and installation drawings for a given piping system.
The stress
,isometrics will be used only for engineering information as intended.
5.
Conclusion The corrective actions, as described
- above, have satisfactorily corrected the cause of the deficiency and willpreclude its recurrence.
Zn addition, the turnover process requires verification that Bechtel QC has completed an inspection of each hanger on the piping system being turned over.
Hangers installed for which QC inspection is not complete or has not been initiated will be identified as exceptions in the turnover package.
Existing procedures are in place to control the completion of turnover exception items.
This process will provide assurance that,all installed, safety-related pipe hangers are inspected using the current Bechtel Project Engineering pipe support system indices.
The current "as built" piping system program requires Bechtel Engineering review and approval of "as-built" piping system and pipe support drawings prepared and submitted by Field Engineering.
This program will identify any deficiencies that may exist and corrective action will be taken through Bechtel Engineering revisions to the appropriate design drawings.
We expect any necessary corrections resulting from "as-built" reviews w'ill be complete prior to fuel load.
The "as-built" program will result in finalized stress isometrics representative of the physical piping systems as installed and will provide a final Bechtel Engineering review and analysis to verify that piping
- systems, as installed, are in compliance with design criteria.