ML18017A832
| ML18017A832 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 02/19/1980 |
| From: | CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML18017A831 | List: |
| References | |
| NUDOCS 8002260666 | |
| Download: ML18017A832 (4) | |
Text
SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO.
1 LAMINATIONIN NAINTZENANCE RAIL SUPPORT PLATES Final Report February 19, 1980 Reportable Under 10CFR50.55(e)
Prepared by:
Carolina Power 6 Light Company
SUBJECT:
Reportable Item Shearon Harris Nuclear Power Plant (SHNPP)
Lamination in Maintenance Rail Support Plates ITEMS:
Plates Used for Maintenance Rail Support SUPPLIED BY:
Graver Northeast 4809 Tod Avenue E. Chicago, Indiana 46312 NATURE OF DEFECT:
During the welding of the support plates, a large lamination in one plate was noticed.
A closer inspection of plates previously welded showed smaller laminations.
DATE PROBLEM WAS CONFIRMED TO EXIST:
January 17, 1980 PROBLEM REPORTED:
January 17, 1980 CP&L (L. E. Jones and A. M. Lucas) informed the NRC Region II office (Mr. R. Bradley) by telephone that the problem was "potentially reportable" under 10CFR50.55(e) and 10CFR21.
February 14, 1980 - CP&L (N. J. Chiangi) informed the NRC Region II office (Mr. M. Hunt) by telephone that the problem was reportable under 10CFR50.55(e) requirements.
N SCOPE OF PROBL&i:
One plate from Graver C-27 heat no.
802J06219 was used to fabricate the maintenance rail support plates.
While welding one plate, a large lamination occurred.
SAFETY LMLICATIONS:
The maintenance rail is supported from the dome.
If the rail were to fall, there would be a good chance that it would damage a piece or pieces of safety related equipment.
REASON(S)
PROBLEM WAS REPORTABLE:
A support plate having laminations does not meet its intended design.
This condition is addressed in 10CFR50.55(e) and is a condition which "...were it to have remain uncorrected, could have affected adversely the safety of operations...and which represents:
(iii) a significant deficiency in construction...
which will require extensive evaluation...
or extensive repair to meet the criteria and bases stated in the Safety Analysis Report or construction permit..."
(Quotation from 10CFR50.55(e).
CORRECTIVE ACTIONS: All support plates that had previously been welded in place were removed.
These plates, along with the remaining portion of plate and remaining fabricated plates (from heat no.
802J06219),
were removed from the site.
A new plate, also 'supplied by Graver was ultrasonically tested (to ensure no laminations existed) and subsequently used to fabricate the support plates.
This problem was identified by the site gA on DDR-345.
The material furnished by Graver has a serial number-heat no.
(C-27-802J06219/J7066).
It is shown on CB6I
- drawing, CB61 22, revision 4.