ML19351G325
| ML19351G325 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 01/15/1981 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Curtis N PENNSYLVANIA POWER & LIGHT CO. |
| References | |
| NUDOCS 8102230515 | |
| Download: ML19351G325 (1) | |
Text
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- o UNITED STATES 8I)
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i NUCLEAR REGULATORY COMMISSION
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Docket No. 50-387 15 JAN 7331 50-388 O
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/V Pennsylvania Power & Light Company ATTN: Mr. Norman W. Curtis k
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Vice President Engineering and Construction - Nuclear u,
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2 North Ninth Street Allentown, Pennsylvania 18101 Gentlemen:
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Subject:
Improper Sloping of GE Piping and Tubing Thank you for your letter, PLA-593, dated December 23,1980, which forwarded a final report pursuant to 10 CFR 50.55(e) regarding the subject matter.
This matter will be reviewed during a subsequent inspection.
Your cooperation with us is appreciated.
Sincerely, W
a Robert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc:
l A. R. Sabol, Manager, Nuclear Quality Assurance W. E. Barberich, Licensing Engineer l
H. W. Keiser, Superintendent of Plant l
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'r Wo N o 4 T H N I N T H ST R E E T, A L L E N T OW N, P A. 18101 P H O N Es (215) 8 21 5151 NCRUAN W. CURTIS V4ca Presscent Engmeenng & Carstruction. Nuclear 821 5381 December 23, 1980 Mr. Soyce H. Grier Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 SUSQUEHANNA STEAM ELECTRIC STATION REVISION 'IO THE FINAL REPORT OF A DEFICIENCY IN IMPROPER SLOPING OF PIPING & TUBING LINES FOR G.E. INSTRUMENTATION ERs 100450/100508 FILE 840-4/900-10 PLA-593
Dear Mr. Grier:
This letter tran.smits a revised final report relative to a deficiency in the installation of instrumentation piping and tubing connected to G.E.
instrumentation. The revised report supercedes information previously provided by PLA-512 which reported the deficient condition in accordance with the provisions of 10CFR50.55(e).
The revised report provides a table of acceptance criteria (Table I) for reworked lines. The acceptance criteria for future instrument line installa-tions remains as originally stated (> " per foot) in PIA-512.
We trust you will find this supplemental information to be sufficient.
Very truly yours, N. W. Curtis Vice President-Engineering & Construction-Nuclear Attachment ARS:mcb b.gx r Si r 19 @
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,ENusytuNu roWE.a uonTcom,ANv
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s Mr. Boyce H. Grier December 23, 1980 1
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Mr. Victor Stello (15)
Director-Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. Mcdonald, Director Office of Management Information & Program Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert M. Gallo U. S. Nuclear Regulatory Commission P. O. Box 52 Shickshinny, Pennsylvania 18655 I
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y MCAR 1-58 FINAL REPORT (REV 1)
Subject The installed piping and tubing to GE equipment is lack.ing proper slop'e.
Description of Potential Problem General Electric Piping and Tubing, Process Instrumentation Specification 22A4019, Paragraph 4.2.2.1.2, states: "Where slopes are indicated in the installation arrangement schematics or elsewhere, a minimum slope of 1/2" per foot shall be provided."
Contrary to the stated requirement, Bechtel Nonconformance Report 5807 lists 41 small pipe installations to General Electric equipment that do not meet the minimum 1/2" per foot slope requirement.
Cause Three conditions may have contributed to the installation error.
They are:
Project eng' neering did not specify the required slope (Led /2" per foot 1.
i min) on some of the design drawings.
2.
Ccustruction failed to incorporate specified slope requirements on some of the field prepared fabrication isometric drawings.
-3.
Construction failed in some cases to install the small pipe to the slope specified on the Field fabrication isometric drawings.
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Analysis of Safety Imn11 cations l
Project Engineering has determined if the deficiency were to have'gone uncorrected it could have adversely affected the safe operation of the plant, and it is therefore deemed reportable under 10CFR 50.55(e).
This deficiency could produce an error in essential instrumentation in excess of design ILnits.
Inaccurate instrunent readings and delayed trips could result on lines which have differential instruments which function on low differential pressures.
This would be the result of air entrapment in the lines caused by improper slope.
However, lines l
with devices which operate on high differential pressure would not be as sensitive to slope variations and would not adversely affect the safe operation of the plant.,
Corrective Action Field quality control has documented on Nonconformance Reports 5807 and 6055 all-lines that do not meet the requirements of the GE specification (i.e.,1/2" per foot minimum slope).
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Project engineering has reviewed the problem with. General Electric engineering b
and revisul acceptance criteria have been developed for " installed" piping for the various categories.of instrumentation involved.
Engineering Memo for Construction 4992, dated June 16, 1980 forwarded this criteria to the field.
Attachment l
Page 1 of 2
e Those lines which' have not yet been insta'lled shall be installed with a py slope per foot.
Installed lines which require rework shall be sloped to the requirements of Table'I as a minimum. Field construction is reworking identified lines which do not meet the revised acceptance criteria.
The Unit I as-built drawings will include the actual slope of installed lines.
Project engineering will revise Unit II SKM's to include a note that the pipe and or tubing shall be installed to have a min 4== slope 'of h" per foot (Ref. GE Spec. 22A4019) and Unit II P& ids to include the GE specification
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as a reference.
Field engineering will revise the Unit II fabrication' isometrics to reflect the above requirements.
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Projected Comoletien of Corrective Action All,affected drawings are projected to be revised and Unit I as-builts are projected to be completed by December 30, 1980.
In the interim, field con-struction was notified by Engineering Memo for Construction 5062 to take steps to insure that the subject pipe and tubing are installed in accordance with G'4 Specification 22A4019. Any excepticas are to be documents 0 by 3 Noncon.
formance Report.
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Attachment Page 2 of 2
TABLE I
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'l Lines dsted in Note 2 I Lines I sted in* Note 3 I
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Frca RW or process line l > 5/16" per foot I
centinuous positive connection to penetration I continuous slope I
slope (1) flued head I
1 I
i Frczn penetration flued l
l head to excess flow I > 3/16" per fcot i
Zero slope OK check valves (only if I c,ontinuous slope l
length is less than 3 l
l feet) f I
Notes:
5.? K slepe of 131/8" per-foot,?fis considered poisitiver* _
i 2.
W e following functions are included:
(a) RW level (except top head level sensing line)
(b) Core Spray d. p (c) Main Steam flow signal to feedwater control system 3.
W e following functions are incitfed:
(a) Top head level sensing line (b) Core 'dp (c) Main steam high flow isolation (d) Elbow taps (Recire, RER, RCIC, HPCI, RWCU Systems)
(e) Jet pung instrurrentation (f) Recirc pung dp (g) Recirc loop suction pressure (h) Head flange seal pressure (i) Recire pump seal pressure (j) Below core plate pressure (k) RW drain line pressure 4.
Recire loop sample line does not regaire slope O
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