ML110410702
| ML110410702 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/10/2011 |
| From: | Kalyanam N Plant Licensing Branch IV |
| To: | Clark R Entergy Operations |
| Kalyanam N, NRR/DORL/LPL4, 415-1480 | |
| References | |
| TAC ME4942 | |
| Download: ML110410702 (2) | |
Text
From:
Kalyanam, Kaly Sent:
Thursday, February 10, 2011 4:37 PM To:
CLARK, ROBERT W Cc:
Lent, Susan; Burkhardt, Janet
Subject:
RAI on the Relief Request ANO-1 R&R-014 The SUNSI information as follows:
Plant: Arkansas Nuclear One, Unit 1 Docket No.: 50/313
Subject:
RAI on the Relief Request ANO-1 R&R-014 TAC Nos.: ME4942 SUNSI Review Done: Yes. Publicly Available, Normal Release, Non-sensitive, From: N. Kalyanam To: R. Clark Mr. Clark, By letter dated October 26, 2010, Entergy Operations, Inc (Entergy) submitted Relief Request ANO-1-R&R-014. Entergy is requesting relief in accordance with 10 CFR 50.55a(g)(6)(i) for a temporary non-code repair to an ASME Code Class 3 pipe in the Arkansas Nuclear One, Unit 1 (ANO-1) Service Water (SW) system.
The NRC staff has determined that additional information, as detailed below, is needed to complete the review.
OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST ANO-1 R&R-014 ENTERGY OPERATIONS, INC.
ARKANSAS NUCLEAR ONE, UNIT 1 By letter dated October 26, 2010, Entergy Operations, Inc (Entergy) submitted Relief Request ANO-1-R&R-014. Entergy is requesting relief in accordance with 10 CFR 50.55a(g)(6)(i) for a temporary non-code repair to an ASME Code Class 3 pipe in the Arkansas Nuclear One, Unit 1 (ANO-1) Service Water (SW) system. The NRC staff has determined that additional information is needed to complete the review.
- 1. Specify the ANO-1, fourth inservice inspection interval start and end dates.
- 2. The leak is described as being in the flange weld. Is the pipe-to-flange weld a full penetration butt weld? If not, describe the configuration.
- 3. Were the ultrasonic thickness (UT) measurements made at a zero degree angle? If so, was the crown of the weld removed to facilitate UT interrogation of the weld metal?
- 4. Was weld metal interrogated at the 5 additional inspection locations?
- 5. Would the UT measurements have been able to determine if the leak was from a through wall crack or linear flaw?
- 6. On what basis was the root cause determination of Microbiologically Influenced Corrosion (MIC) made?
- 7. What are the dimensions of the defect (include NDE uncertainties and limitations)?
- 8. Provide details of the through-wall analysis calculation