ML20197H671
| ML20197H671 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/07/1984 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8406190121 | |
| Download: ML20197H671 (3) | |
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-1 DUKE POWER GOMPANY e.o. nOx aa:8o CHARLOTTE, N.C. 28242 HALB. TUCKER tztzenoxz m om..n June 7, 1984 84 JUN14 Pj2: $g e
Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory. Commission Region II 101 Marietta Street, NW, Suite 2900 t
Atlanta, Georgia 30303 Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report No. SD 413-414/84-13.
Very truly yours, v
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Hal B. Tucker LTP/ibh Attachment cc: Director INPO Records Center Office of Inspection & Enforcement Suite 1500 U. S. Nuclear Regulatory Commission 1100 circle 75 Parkway Washington, D. C.
20555 Atlanta, Georgia 30339 NRC Resident Inspector Mr. Robert Guild, Esq.
Catawba Nuclear Station Attorney-at-Law P. O. Box 12097 Palmetto Alliance Charleston, South Carolina 29412 2135 Devine Street Columbia, South Carolina 29205 Mr. Jesse L. Riley Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207 gM%mpaggi acM
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REPORT NUMBER:
SD 413-414/84-13 REPORT DATE:
June 7, 1984 FACILITY: Catawba Nuclear Station Units 1 and 2 IDENTIFICATION OF DEFICIENCY:
A burlap sack containing a number of 1" pipe nipples, a fabricated section of 1" pipe,and some wood wedges was found in a section of 12" UHI (Safety Injection System) piping inside contain,aent. This deficiency was identi-fied by Nonconforming Item 18391 on April 18, 1984.
INITIAL REPORT:
On'May 8, 1984, Virgil Brownlee, NRC Region II, Atlanta, Georgia was noti-fied of the subject deficiency by R C Gamberg, R D Carroll, L M Coggins, and T L Utterback of-Duke Power Company, Charlotte, North Carolina.
DESCRIPTION OF DEFICIENCY:
A burlap sack containing some miscellaneous piping material (l" pipe nip-ples and a. fabricated section of 1" pipe) and some wood wedges was found in a section of 12" UHI (Safety Injection System) piping shown on Design drawing CN-2491-N1018.
These itm.s were discovered as a result of re-opening.the 12" pipe in order to retrieve a consumable insert (EB ring). The EB ring had been inadvertent-ly dropped into the vertical section of pipe connected to the horizontal section containing the miscellaneous material. Since the fit-up and internal cleanness inspections had already been performed, it is likely that this material was dropped /placed in the pipe after the welds had been completed.
This is a violation of the requirements of Quality Assurance Procedure M-24 in that the internal cleanness of the piping was not maintained.
It cannot be determined why the miscellaneous material was in the section of UHI piping. An investigation was perforced by the Security Coordinator in an attempt to determine if the material was intentionally placed in the pipe,but no such evidence was uncovered. The material may have been accidentally dropped (either knowingly or unknowingly) into the pipe but was not reported for corrective action,or it may have been an act of vandal-ism. The open end of the pipe was located in an area of frequent Construc-tion personnel traffic.
ANALYSIS OF SAFETY IWLICATIONS:
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-Had this deficiency not been detected, it may have adversely affected safety of operation. The effect of this debris partially or totally blocking a line or entering the reactor vessel upper head during a LOCA would result in a reduction of required safety injection cooling.
CORRECTIVE ACTION:
The material has been removed from the piping. In addition, the remainder of the horizontal run of 12" UHI pipe was radiographed and no large objects similar to the pipe nipp'les and wedges were discovered.
A similar section of horizontal pipe adjacent to the 12" UHI pipe which performs the same function was also radiographed with no discovery of large objects similar to the pipe nipples and wedges. The radiography did reveal
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some small objects (metal shavings, a nail, small piece of tubing) which will be removed.
An evaluation was performed to identify other safety related piping which
'does not receive a flush / cleaning by the Construction Department. The investi-gation showed this specific problem to be isolated to the 12" UHI piping.
A high pressure test / blow down has been performed successfully by Nuclear Production on-the Unit 1 UH1 piping. The flow velocities in the UHI piping during this test are equivalent to the normal operating conditions. No significant debris was expalled from the piping. Any significant blockage in the Unit 1 piping would have been detected. Therefore, no additional investigations are deemed necessary.
We will evaluate our program concerning piping which does not receive a final cleaning by Construction in accordance with Quality Assurance Procedure L-7.1 to determine if changes are required. This evaluation will be complete by August 1, 1984.
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