ML20033D212
| ML20033D212 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 11/23/1981 |
| From: | Parker W DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8112070384 | |
| Download: ML20033D212 (2) | |
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DUKE POWER COMPARS REGION O
Powen Buttniwo 422 Sourri Cirunen Srazzi, CarAntartz, N. C. esa4a q j Jin't 3() SYb ' h wf LLI AM O. PA R M ER, J R.
VsCE PRES # DENT TELEPHONE! AAEA 704 Strau Paoouctiom 373-4083 November 23, 1981 W
Mr. James P. O'Reilly, Director g
U. S. Nuclear Regulatory Commission
.O Region II 101 Marietta Street, Suite 3100 j
Atlanta, Georgia 30303
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00$L U spacer Re: Catawba Nuclear Station
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Unit 1 Docket No. 50-413 D
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Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 413/81-26.
Ve truly yours,
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William O. Parker, Jr.
RWO/php Attachment cc: Director Mr. Robert Guild, Esq.-
Office of Inspection and Enforcement Attorney-at-Law U. S. Nuclear Regulatory Commission 314 Pall Mall Washington, D. C. 20555 Columbia, South Carolina 29201 Resident Inspector-NRC Palmetto Alliance Catawba Nuclear Station 2135 Devine Street Columbia, South Carolina 29205 g
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.3 CATAWBA NUCLEAR STATION REPORT NUMBER: SD 413/81-26 REPORT DATE: November 23, 1981 FACILITY: Catawba Unit 1 IDENTIFICATION OF-PROBLEM: Failure to remove welding purge dams from 24" FW
-supply header.
DESCRIPTION OF DEFICIENCY:
On-11/3/81 W. O. Henry, C. A. Bell, and R.'L. Misenheimer advised A. Ignatonis of the NRC of the following deficiency in Construction.. During weld repairs on the 24" FW supply header, following flush and most. hydro work, the header was entered to remove a dirt film and grit _from the inside of the pipe. During-this cleaning of the headcx, two plywood / red rubber purge dams were found-within 15 feet of the inlet from the refueling water storage tank. These dams were constructed of 3/4" plywooc, 1/4" plywood, and 1/8" red gasket rubber sandwiched in the center _and ostending 1/2" past the wood circumference..These dams were previously used to contain an argon purge gas during welding of the header. One dam was found loosely in-place about 5 feet'into the header while the-second dam was wedged tightly about 15 feet into the header. Both dams were removed while the header was drained for weld repairs.
ANALYSIS OF SAFETY' IMPLICATIONS:
The 24" FW supply header serves as the initial' source of water.for the emergency core cooling system (ECCS). The presence of these dams:would probably have been detected during subsequent preoperational testing; however, there is no analytical engineering method.to prove the dams would not have restricted flow to the ECCS pumps had they not been detected. Consequently, a flow reduction-or blockage must be' assumed which could hav-- caused a reduction or loss of ECCS capability. Loss of ECCS-capability would adversely affect the safety of. opera-tion na defined under 10CFR50.55(e).
~ CORRECTIVE ACTION:
No further Engineering evaluationJor resolution.is required since !ho dams have' been removed from the inside of the piping. Construction and QA:have reviewed
.the applicable Construction and inspection' procedures and have determined them to tai adequate. Actions'to minimize the' potential of future occurrences are that appropriate personnel will'be instructed-in'the process controls necessary to assure removal of purge dams.. Process controls are deemed adequate to minimize the potential of-future occurrences due ~ tof the 'small number of L this - type.of purge >
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-dam.used!in the construction' process.. The normal' purge dam;used infsmallerL
_ diameter piping is of'the water soluble type.- This. deficiency _ applies onlyito Catawba Unit 1 and'does not apply to Unit-2_or other Duke Nuclear Stations.;
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