ML19259B938
| ML19259B938 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 04/16/1979 |
| From: | Lundvall A BALTIMORE GAS & ELECTRIC CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7906020199 | |
| Download: ML19259B938 (3) | |
Text
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BALTIMORE GAS AN D ELECTRIC COMPANY MRi\\
GAS AND ELECTRIC DUILDING B ALTI M O R E, M ARYLAN D 212 03 April %, 1979
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$CE Pat s.Ctti so o office of Inspection and Enfore ment, Region I U.S. Nuclear Regulatory Cce: mission 631 Park Avenue King of Prussia, PA 19406 Attn:
Mr. Boyce H. Grier, Director
Subject:
Calvert Cliffs Nuclear Power Plant Unit No. 1 & 2, Docket No. 50-317 & 50-318 IE Bulletin 03
-Longitudinal Weld Defects in ASME SA-312 type 304 stainlecs steel pipe spools manufactured by Youngstown Welding and Engineering Company Gentlemen:
The subject bulletin requested that se provide certain infomation relative to the pipe conforming to SA-312 type 304 at Calvert Cliffs. Our records indicate that we have some pipe spools prefabricated by M. W.
Kellog and also some field fabricated supports of stainless steel pipe ASTM 312 type 304, manufactured by Youngstown Welding and Engineering Co=pany in 1972. The material is used in the low pressure safety injection system.
Attachment I to this letter provides the infomation requested under item 2 of the bulletin.
The following will be our program for volumetric examination:
1.
Review radiographs of all circumferential welds in the entire length of subject piping.
Since there are twenty-one radio;raphs in forty-eight feet of Youngstown pipe and each radiograph cosrrs approximately two or four inches of longitudinal seam, this review will screen approximately seven feet of the forty-eight feet of.ongitudinal weld.
The sample examined is censidered to be conservative. The location of radiographs also covers the high stress areas of the pipe.
2.
The acceptance criteria of ANSI B31.7 will be applied to the examination of longitudinal welds which are described in item 1 above.
2285 168 7 90602 0l99
8 Mr. Boyce H. Grier April 16, 1979 3
If the acceptance criteria of B 317 is not met for any veld, we vill volumetrically examine two additional spots of six inches length in the vicinity of the questionable location. If the two additional spots examined meet the acceptance criteria of B 31.7 the defective weld dis-closed by the original radiograph may be repaired. If either of the additional spots examined show unacceptable defects, we will d.evelop another program for the evaluation and the disposition of the defective pipe.
We believe this program has sound engineering basis to identify and correct any welding defect in longitudinal welds of piping manufactured by Youngstown Welding and Engineering Ccupany.
This effort outlined above is currently in progress and we expect to co=plete the radiographic review within thirty days.
Very truly yours.,
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Enclosure.
cc:
J. A. Biddison, Esquire G. F. Trowbridge, Esquire E. L. Conner, Jr.- NRC J. W. Brothers - Bechtel Office of Incpection & Enforcenent U.S. Nuclear Regulatory Ccemission Washington, D.C.
20555 Attn:
Dirt.*.or, Division of Reactor Construction Inspection 2285 M
.u ATTACIDENT I LOCATION / APPLICATION OF YOUPISTOWN PIPE FATERIAL SUPPLIED TO CALVERT CLIFFS Design Pipe Pipe Pressure /
Length Application System Location Size Te: perature of Pipe
- 1. Piping: Low Pressure Low Unit 2 12" 500psig/
8' - 3" 0
safety injection pressure containment nominal 350 F pump discharge safety
& Aux. Bldg.
dia.,
system to resctor injection 25" wall coolant loop up stream of flow con-trol station
- 2. Piping: Safety Injec-Low pres-Units 1 & 2 10" r.om-250psis/
13' - 4" 0
tion tank to check sure saf-containment inal dia 200 F valve on tank outlet ety in-0 307" jection wall 3
Piping: Engineered Low pres-Units 1 & 2 10" nom-60psig/
safeguard pu:::p sure Aux Bldg.
inal dia 300 F 26' - 2" suction safety 0 307" injection wall Subtotal 47' - 9" b,
Supports: Saddle, Low pres-Unit 2 12" nom-8' - 1" stanchion & radius sure saf-inal dia plate ety injec-0.25" tion wall Total 55' - 10" 2285 170 s