ML19269C275
| ML19269C275 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 01/18/1979 |
| From: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 7901310035 | |
| Download: ML19269C275 (3) | |
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SOUTH CAROLINA ELECTRIC & GAS COMPANY POST OFFICE Dox 764 COLUMBI A. S. C. 29218 January 18, 1979 United States Nuclear Regulatory Commission ATTN:
Mr. James P. O'Reilly Director Marietta Building, 31st Floor Marietta Street Atlanta, Georgia
J302
Subject:
V. C. Summer Nuclear Station Unit #1 Reportable Items in Accordance with 10CFR50.55(e)
Gentlemen:
On December 22, 1978, SCESG identified to Region II appIrent insufficient cable slack in IE electrical circuits. This letter is to provide our written report on this matter and to update the status of previously identified items.
As a result of an inquiry f rom SCE&G/QA to the Site Resident Engineer, it was found that insufficient slack to accomodate relative motion between terminations and cabling supports under worst case design basis seismic events might exist.
Confirmation of actual existance of such a condition could result in termination damage or f ailure during the design basis event.
It appears that the condition was the result of a combination of speci-fication of marginal quantitative acceptance criteria for cable slack on the part of the Architect / Engineer (A/E) and failure of the Constructor to provide slack or queetion the lack of complete quantitative definition of slack.
As immediate corrective action, a " generic criteria" was established by the A/E which represents sufficient cable slack regardless of specific equipment location. An inspection program was initiated by SCE6G/QC using the generic criteria and terminations were found not meeting this criteria.
For this reason, we have judged this item reportable under the requirement of 10CFR50.55(e).
As terminations are found that do not satisfy the criteria, the cable is being reworked in accordance with approved, cable pulling procedures.
In those cases where sufficient slack cannot be provided to meet the teneric criteria" without exceeding procedural requirements, the A/E is providing a " refined" O
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2
Mr. James P. O'Reilly
'id' "
Page 2 January 18, 1979 criteria based on building and elevation.
It should be noted that it is possible that all cases requiring " refined" criteria may be acceptable "as is" and this situation would not then have represented a reportable item.
However, we have elected to report the item since complete re-inspection and rework may take some time.
As part of long term corrective action, all future 1E circuits will be terminated using the generic (conservative) criteria.
In addition, as part of the SCE&G/QA audit of the A/E design control program in December 1978, the question of cable slack criteria specification was investigated.
Although cumbersome ano not as available as desired, based on extensive discussion and review, SCE6G/QA concluded that minimally acceptable criteria were provided and no audit findings were generated in this area.
SCE&G considers our committed corrective action will correct any concern with existing terminations and preclude future recurrance. Objective evidence is available for your review at the Site to establish implementation of our commitments.
SCE&G considers this information our final report on this item.
As an update of our December 22, 1978 letter to you and items discussed since then, we present the f ollowing inf ormation:
1.
QC Inspection of Electrical Supports On January 9, 1979, Mr. Compton of Region II was on-Site and was advised that a reinspection of supports had established approximately 2% of the welds as suspect.
On January 17, Region II informed by the SCE&G Group Manager of Production Engineering, was that in-depth Resident Engineer evaluation had established that the welds have the requisite strength for the application and the item is therefore not reportable under 10CFR50.55(c).
This item is considered closed.
2.
Rockwell Valve _ Operator Qualification No change in the December 22, 1978 reported status.
3.
Emergency _ Diesel Generator Deficiencies hj telephone conversation January 12, 1979, the supplier advises that examination of SCE&G fuel lines indicates the sharp ridge caused by the improper flaring tool was present and therefore confirms a reportable item. The supplier advises a letter to SCESG is in route with a copy to Region III.
Since all repairs have been
Mr. James P. O'Reilly Page 3 January 18, 1979 accomplished and the supplier has provided generic corrective action, we consider action in this area complete. The fuel injection pumps for SCE&G diesels have been removed, tackaged and returned to the supplier for run-in.
Present advisement indicates the run-in and required testing ia complete.
Rocker arm inspection has been QA released but has not begun.
QA release of lobe oil header inspections is pending receipt of necessary procedures from the supplier.
In summary, we consider this letter our final report on three items as discussed above. You may be assured we will continue to work toward resolu-tion of all items and will keep you informed of their status.
Please feel f ree to contact me if you have any questions or desire clarification of any information contained in this report.
Very truly yours, DAN /MCJ/jls cc:
C. J. Fritz G. C. Meetze kdfice of Director of Inspection & Enforcement Washington, D. C.
BCC:
V. C. Summer D.
l..
Nauman E. H. Crews, Jr.
T. C. Nichols, Jr.
H.T.
Babb E. Wielkopolski R. C. Holzwarth NPCF/Dixon H. Radin A. A. Smith, Jr.
J. F. Algar J. M. Woods C. C. Wagoner W. L. West C. K. Brown T. Conner, Jr.