ML19345A269
| ML19345A269 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 03/14/1973 |
| From: | Loibl E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19345A268 | List: |
| References | |
| 50-029-73-01Q, 50-29-73-1Q, NUDOCS 8011180416 | |
| Download: ML19345A269 (1) | |
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2 UNITED STATES
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.l ATOMIC ENERGY COMMISSION
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DIRECTOR ATE OF REGut.ATORY OPERATIONS g
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f-970 BRO AD STREET NEWARK, NEW JERSEY 07102 Inn e r
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j RO INQUIRY REPORT NO. 50--29 /73-01Q t
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Subject:
Yankee Atomic Electric Co.
- 7 i
20 Turnpike' Road f
Westboro, Massachusetts-
[f License No.:
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Facility:
Yankee Rowe 3
.l Rowe, Massachusetts
Title:
Equipment Deficiency - Isolation l'
Valve Surface Defects Prepare #. by:
M/Irrb//fiJ j
E. R. Loibl, Actirig Sr. Reactor Inspector Date' A.
Date and Manner AEC was Informed:
In response to Region I questions concerning the valve wall thickness verification program (
Reference:
Region I letter to Yankee Atomic Electric Company dated February 7,1973 and Yankee Atomic Electric Company response dated March 7, 1973), the licensee informed Region j
I by telephone on March 13, 1973 that surface defects were discovered on the reactor coolant isolation valves.
B.
Description of Particular Event or Circumstance:
j The licensee stated that during preliminary surface cleanup prepara-i tions, being done prior to adding veld overlay to the reactor coolant I
I isolation valves, nondestructive testing (liquid penetrant) re-vealed surface defects on all eight of the valves. Most of the
~
crack like-defects described by the licensee as being discontinuities, I
.were stated to be quite shallow (approximately.030") and the maximum defect was approximately.120" deep and 1/2" long. All
.j-of the defects were stated to have been removed by surface grinding.
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Removal of the defects was stated to have been verified by non-
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l destructive testing (liquid penetrant).
The work of applying weld overlay (to meet minimum wall thickness requirements) was stated by the licensee to have been completed.
C.
Action by Licensee:
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A written report to the AEC 'will be submitted by the licensee 1
addressing the defects found and corrective actions taken.
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