ML19263B584
| ML19263B584 | |
| Person / Time | |
|---|---|
| Site: | Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 01/02/1979 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Wofford A LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 7901220036 | |
| Download: ML19263B584 (1) | |
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UNITED STATES c
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REGION 1
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$31 PARK AVENUE
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af KING OF PRUS$tA, PENNSYLVANIA 19406 J M 0 2 gg n Docket No. 50-322 Long Island Lighting Company ATTN: Mr. Andrew W. Wofford Vice President 175 East Old Country Road Hicksville, New York 11801 Gentlemen:
Subject:
Socket Welds of Fittings, Schedule 160 Small Bore Pipe (J. P. Navarro letter of December 11,1978)
Thank you for the letter, referenced above, which forwarded a final report pursuant to 10 CFR 50.55(e) regarding the subject matter.
You, report will be reviewed and evaluated, and should we require additional information concerning this matter, we will contact you.
Your cooperation with us is appreciated.
Sincerely, N
Robert T. Carlson, Chief Reactor Construction and Engineering Support Branch cc:
J. P. Navarro, Project Manager Edward M. Barrett, Esquire Edward J. Walsh, Esquire T. F. Gerecke, Manager, Engineering QA Department 4
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LONG ISLAND LIGHTING COM PANY SHOREHAM NUCLEAR POWER STATION myzcaggyur P.O. BOX 618. NORTH COUNTRY ROAD e WADING RIVER. N.Y.11792
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December 11, 1978 SNRC-342 Mr. Boyce Grier, Director Office of Inspection & Enforcement Region 1 U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406 LONG ISLAND LIGHTING COMPANY Shoreham Nuclear Power Station - Unit 1 Docket No. 50-322
Dear Mr. Grier:
On November 8,1978, in accordance with 10CFR50.55(e) we reported verbally to Region 1 a deficiency with the installation of socket weld fittings on Category I schedule 160 small bore pipe.
This letter serves as our 30-day written report of this deficiency.
DESCRIPTION OF THE DEFICIENCY The deficiency associated with the installation of socket weld fittings on schedule 160 small bore pipe is that the fillet welds joining the socket weld fittings to the pipe have undersized fillet leg length (refer to Attachment I).
The fillet leg length is re-quired to be 1.09 times the nominal pipe wall thickness as per Figure NB-4427-1 in the summer of 1977 addenda of ASME Section III (refer to Attachment II).
The subject fillet welds on schedule 160 small bore pipe do not meet this requirement in many cases.
The fillet welds on small bore pipe other than schedule 160 are adequate as installed since there is a smaller required fillet leg length due to the thinner pipe wall of lower schedule pipe.
CORRECTIVE ACTION All fillet welds for socket weld fitting attachments to schedule 160 small bore pipe will be inspected for proper fillet leg length.
Socket weld fittings with insufficient fillet leg length will have additional weld material added to increase the fillet leg length to meet the code requirement.
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December 11, 1978 Mr. Boyce Grier Page 2 CORRECTIVE ACTION TO PREVENT RECURTdNCE Inspectors will be made cognizant of the requirement delineated above and all future inspections of socket weld fittings will include this requirement.
Training classes have been held wherein inspection personnel were instructed in the min 4=m fillet leg length for various size and schedule pipe.
A comprehensive document was distributed to all inspection nersonnel delineating the required minimum fillet leg length for 'all size and schedule small bore pipe.
DATE OF FULL COMPLIANCE We estimate that all fillet welds for socket veld fittings on schedule 160 small bore pipe will be in full compliance with the above code requirement by December 1,1979.
Very truly yours, G,7 e
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J. P. Novarro Proj ect Manager Shoreham Nuclear Power Station JJM:jv cc:
Mr. John G. Davis, Director Office of Inspection & Enforcement d
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ATTACllMEtiT I SOCKET WELD FITTIl1G E'ILLET WELD PIPE WALL
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PIPE FITTING En = nominal pipe wall thickness FILLET LEG LE!1GTil h 1.09 x En
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ATTACH MEWF ll NS-4435-NB-4452 -
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. NB-4440 EXAMINATION OF WELDS which it is attached.
All welds'shall bel' xamined in accordance with the' '.,
.(d).The weldin8 materialis certified.m accordance with the requirements of NB 2130. NB-2430, and re9uirements ofNB-5000 e
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7" NB-4436 Installation of Attachments to Piping General Requirements ',
Systems After Testmg Unacceptable. defects m weld metal detected by
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Permanent attachments meeting the requirements methods required by NB-5000. or by the tests of NB-of NB-4433 and temporary or minor permanent 6000 shall be eliminated or the indication reduced to attachments meeting the requirements of NB-4435 an acceptable limit and repaired when necessary.
may be welded to the pipine system after perfor.
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(c) welds shall be restricted to fillet welds not exceeding % in. (10 mm) throat thickness and to full reduced below that required by 'B-3000.
4 (b) The dep ession. after dect elimination. is penetration welds attaching materials not exceeding blended ut.iformly into the surrounding surface.
H in. (13 mm) in thickness:
(c) The area is examined after blending. by a (d) welds shall be examined as required by NB-magnetic particle or liquid penetrant method. meet-5000.
ing the requirements of NB-5000, to ensure that the 1%
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