ML19350A555
| ML19350A555 | |
| Person / Time | |
|---|---|
| Site: | Mcguire |
| Issue date: | 01/30/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19350A542 | List: |
| References | |
| NUDOCS 8103160480 | |
| Download: ML19350A555 (2) | |
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- -U '( I-DiiKE POWER CO>IPMY Powra Butto No 422 Sourn Cucacis Srazzt, CauntoTTE. N. C. asa42 rn 5 92: 52 WIWAM O. PA R M E R, a.
January 30, 1981 Vier Passiotwf itLtp omt:AmtA 704 Secame Peoawction 373 40e3 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Subject:
McGuire Nuclear Station Docket No. 50-370
Reference:
RII:LDZ 50-370/80-12
Dear Mr. O'Reilly:
As requested by Mr. L. D. Zajac of your staff, please find attached a supplemental response to the item of noncompliance identified in the subject inspection report.
V truly yours A^
A' n m-w WilliamO. Park'er,Jr.O RWO:scs Attachment i
I 8108160 L$9 L
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DUKE POWER COMPANY MCGUlRE NUCLEAR STATION Second Supplemental Response to IE inspection Report 50-370/80-12 The NRC requested supplemental informatica on the following items.
Item I and 2.
Mr. Zajak stated that Duke Fower qualificatior, procedures do not formally establish the number of checkpoints required for the practical examination nor does it require documentation on the test objects used during the practical examination.
Res ponse The qualification procedure will be revised to require a minimum number of check-points and to require documentation of the test objects used during the practical exam.
The procedure will be revised by March 1, 1981.
We offer the following revised response to item 6.
Res ponse ASME Code requirements have been reviewed against the two welds in question.
N(X) - 4250 establishes a maximum envelope for welding end transitions. Within that envelope, adjoining surfaces with greater than a 150 degree included angle are ecceptable as welded. When the included angle is less than 150 degrees, a radius must be provided at the intersection of the two surfaces.
Since weld CA 2FW 12-3 was overlapped onto the 45 degree slope, the included angle between the weld (not including reinforcement) and the 45 degree taper may be less than 150 degrees, which requires a radius to be provided.
Weld RN 2F - 520 was welded onto a 3: 1 taper, and the included angle is, therefore, greater than 150 degrees.
This weld is acceptable.
The following work will be accomplished by March 15, 1981.
1.
Weld CA 2FW 12 - 3 will be provided with the radius required by N(X) - 4250.
i 2.
We will verify that the condition seen on the deficient weld is an isolated incident.
(Our practice is not to weld onto the 45 degree slope.
In the case involved this occurred because the length of 3: 1 taper on the valve end was short.)
3 The requirements of N(X) - LISO will be clarified to our Welders and Welding Inspectors.
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