ML19346A194
| ML19346A194 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 04/01/1981 |
| From: | Martin T Public Service Enterprise Group |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19346A191 | List: |
| References | |
| NUDOCS 8106050369 | |
| Download: ML19346A194 (3) | |
Text
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Thomas J. Martin Public Service E!ectric and Gas Company 80 Park Plaza Newark. N.J. 07101 201/4304316 Vica President Engineersag and Construction Mr. Boyce H. Grier, Director U.
S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Mr. Grier:
NRC INSPECTION REPORT 50-354/79-04 NO. 1 AND 2 UNITS HOPE CREEK GENERATING STATION The following is our final report of actions taken in re-sponse to the findings of Inspection 79-04 relative to weld buildup on pipe fabricated by Dravo, Incorporated.
PSE&G has submitted previous corrcspondence concerning this sub-ject on five occasions, with the most recent letter dated March 4, 1981.
Dravo's list of affected spools (those shipped before Novem-ber 31, 1979) was reviewed to determine the number of poten-tial buildups requiring additional NDE.
The following ground rules were applied to this review:
1.
All buildups that were not covered by a Dravo surface examination would be surface-examined to satisfy NC/ND-2539.4.
2.
All buildups (except Class 2 buildups at field ends) that were not covered by a Dravo radiograph would be radiographed to satisfy NC/ND-2539.4 based on the con-servative assumption that all buildups exceed 10% of the section thickness (actual buildup thicknesses are not known).
Class 2 buildups at field ends would be radio-graphed immediately if no examination of any kind was performed by Dravo.
The remaining buildups would be radiographed by Bechtel as part of the in-process radio-graphy of field buttwelds.
3.
Any buildup that Dravo could not specifically identify as OD or ID would be treated as having both and examined accordingly.
810005036%
Mr. Boyce H. Grier 4/1/81
^
The review identified 212 are,is of weld buildup which re-quired additional examination:
Code No. of No. of Buildups Class Spools OD ID Total Results Class 2 30 41 40 81 Two indicatiens found by surface examination.
Class 3 83 101 30 131 Ten indications found by radio-graphy.
Five (5) areas of OD weld buildup on Class 3 spools are not accessible for radiography:
Piece Mark Number Size Location 1-EA-019-S01 36" Penetrates west ex-1-EA-074-S01 36" terior wall Reactor 1-EA-009-S01 36" Building #1 at eleva-
~
1-EA-006-S01 36" tion 86' 6".
1-JE-042-S01 12" Embedded in south wall of diesel area (Auxiliary Building) between elevation 70' and 80'.
We concluded that these five individual cases need not be radiographed for the following reasons:
i 1.
The inaccessible buildups on all five spools passed an MT examination by Dravo and there is no evidence that the buildups were thick enough to require RT per ND-2539.4.
2.
All five of the spools are Nuclear Class 3,150 lb.
flange rating containing buttwelds that do not require radiography either by ND-5000 or by Bechtel specifica-tions, because the weld buildup was not a result of weld repair.
The radiography requirement of ND-2539.4 for repair welds ensures a weld quality for a buildup that is more stringent than and inconsistent with that for a buttweld.
Furthermore, the four EA system spools listed above are fabricated from SA-155, Grade KC70, Class 2 material, which does not require radiography of the lon-gitudinal weld seam.
Therefore, based on the above, the overall quality of the spool is not degraded by the lack of radiography for the buildups.
~. _ _ _.
Mr. Boyce H.
Grier 4/1/81 3.
Before they were installed, all of the embedded spools were hydrotested in accordance with ND-6000 at 1.5 times design pressure, and no leakage was detected.
Documentation of the examinations performed and the results obtained are available on site for review by the NRC.
Vety truly yours, s
CC:
Office of Inspection and Enforcement Division of Reactor Construction and Inspection Washington, D.C.
H.
E.
Morris Bechtel Power Corporation HA02 1/3 1
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