ML20040E499
| ML20040E499 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 01/29/1982 |
| From: | Mcgaughy J MISSISSIPPI POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, AECM-82-51, NUDOCS 8202050003 | |
| Download: ML20040E499 (7) | |
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J AMES P. McGAUGHY. JR.
January 29, 198
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Office of Inspection & Enforcement
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'2d U. S. Nuclear Regulatory Commission f
7 Region II
'i 1932 s 7) 101 Marietta Street, N.W.
1-Suite 3100
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Atlanta, Georgia 30303 Attention:
Mr. J. P. O'Reilly, Regional Administrator V
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Dear Mr. O'Reilly:
SUBJECT:
Grand Gulf Nuclear Station Units 1 and 2 Docket Nos. 50-416/417 File 0260/15525/15526 PRD-81/43, Final Report, Teflon Coating on Drywell Purge Compressor Aftercoolers AECM-82/51 On October 29, 1981, Mississippi Power & Light Company notified Mr. P. A.
Taylor, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site.
The deficiency concerns the Teflon coating on the Drywell Purge Compressor Aftercoolers.
The attached Final Report is submitted with two (2) attachments.
Attachment I concerns the deficiency and its reportability under the pro-visions of 10CFR50.55(e) for MP&L. Attachment 2 concerns a Part 21 report submitted on behalf of Bechtel Power Corporation. On January 21, 1982, MP&L and Bechtel notified Mr. F.
Cantrell, of your of fice, of the Part 21 and con-firmed that the 10CFR50.55(e) time requirements for submission of a written report could be applied to the Bechtel 10CFR21 report.
Yours truly, g. P. McGaughy, Jr.
J ACP:dr ATTACHMENT cc:
See page 2 e2020sooo3 e20129 y:
PDR ADOCK 0S000416 OFFICIAL cop 3 S
PDR Member Middle South Utilities System b A[
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Mr. J. P. O'Reilly AECM-82/51 NRC Page 2 cc:
Mr. N. L. Stampley Mr. R. B. McGehee Mr. T. B. Conner Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. G. B. Taylor South Miss. Electric Power Association P. O. Box 1589 Hattiesburg, MS 39401 l
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Attachment "1" to AECM-82/51 Page 1 of 2 FINAL REPORT FOR PRb-81/43 I.
Description of the Deficiency The Drywell Purge Compressor Af tercoolers (Q1E618001 A & B, Q2E61B001 A
& B) shell interiors had been coated with Teflon. During nozzle modi-fications for new loads, this coating (Teflon) " bubbled" and
" blistered" due to welding heat.
Further investigation of the subject conditions determined that Teflon is not acceptable for use in the containment from a radiation standpoint.
The plant systems affected by this deficiency are System (E61)-
Combustible Gas Control System and System (P41)-Standby Service Water System. This deficiency is applicable to both Unit i and Unit 2.
The determination has been made that this deficiency is not reportable under the provisions of 10CFR21 in that the deficiency was noted as an exception to the turnover documentation prior to MP&L accepting the system (E61).
The cause of the cited deficiency was the failure of the vendor to recognize the limitation of Teflon in a..igh radiation environment.
II.
Analysis of Safety Implications It has been determined that if this condition had remained uncorrected, it could have adversely affected the safety of operations of the plant.
The potential exists that had the teflon coating not been removed from the aftercooler shell interiors, it could have chipped and/or peeled off and entered the safety-related Standby Service Water System (P41) piping from the aftercoolers.
If this were to occur, the possibility exists that the Teflon debris could create flow blockage of cooling water to other components in the system. Therefore, the determination has been made that this deficiency is reportable under the provisions of 10CFR50.55(e).
III.
Corrective Actions Taken This deficiency is limited to the Drywell Purge Compressors used at GGNS; however, our Architect / Engineer has conducted a review of vendor documents for all other heat exchangers contained in the Standby Service Water System (P41) and heat exchangers located in high radia-tion areas.
No Teflon coating, or any other unacceptable coating, has been used in the applicable heat exchangers.
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Attachment "1" to AECM-82/51 Page 2 of 2 The rework of the two (2) Unit 1 af tercoolers is complete. The remain-ing two (2) Unit 2 af tercoolers have been returned to the vendor for rework and all actions will be complete prior to Unit 2 fuel load.
Actions to prevent recurrence are not applicable to the Grand Gulf project in that procurement for both Unit 1 and Unit 2 is complete.
The vendor has been made aware that teflon coatings are not acceptable in high radiation areas, and as a result of our Architect / Engineer's investigation, the condition was determined to be isolated.
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y Attachment "2" to AECM-82/51 Page 1 of 2 ATTACHMENT "A" TO PRD 81/43 TEFLON C0ATING ON DRYWELL PURGE COMPRESSOR AFTERC00LERS PART 21 REPORT 1.
Name and address of the individual... informing the Commission:
J. R. Valdez Quality Assurance Supervisor Bechtel Power Corporation Port Gibson, Mississippi 39150 T. E. Reaves, Jr.
Manager of Quality Assurance Mississippi Power & Light Company City Center North 210 South Lamar Street Suite 320 Jackson, Mississippi 39201 Per telephone call on January 21, 1982 with Mr. F. Cantrell, Region II, it was confirmed that the 10 CFR 50.55(e) time requirements for the written report could be applied and, as such, MP&L was requested to include this report with their 50.55(e) report.
2.
Identification of the facility... which contains a defect:
Grand Gulf Nuclear Station (GGNS)
Unit I and Unit II Port Gibson, Mississippi 39150 3.
Identification of the finn constructing the facility... contains a defect:
Installed at the GGNS by:
Bechtel Power Corporation 15740 Shady Grove Road Gaithersburg, Maryland 20877 t
4.
Nature of the defect... and the safety hazard which could be created by such defect:
The Drywell Purge Compressor Aftercoolers (Q1E618001A&B, Q2E61B001A&B) shell interiors had been coated with teflon.
During nozzle modifications for new loads, this coating (teflon) " bubbled" and " blistered" due to welding heat.
Further investigations into this matter resulted in a conclusion that teflon is not acceptable for use in the containment.
Only the drywell purge compressors aftercoolers for both GGNS Units I and II have been identified as having teflon coating.
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/"'s Attachment "2" to AECM-82/51 Page 2 of 2 4.(continued)
The vendor states that destruction of the teflon coating will not affect the cooling efficiency nor the operability of the aftercooler during required safety operation. However, the potential exists that the teflon coating debris which may enter the safety-related Standby Service Water System piping from the aftercooler could create flow blockage of cooling water to other components in the system.
In conclusion, the deficiency could have <*eated a substantial safety hazard. The Standby Service Water System (System P-41) has been turned over by Bechtel to Mississippi Power & Light Company.
5.
The date on which the information of such defect... was obtained:
An evaluation regarding the applicability of 10 CFR 21 was completed by Bechtel Project Engineering on January 21, 1982.
6.
In the case of a basic component... the number and location of all such components... subject to the regulations in this part:
Infonnation obtained from the supplier indicates that the cited condition existed only at the GGNS.
Reference:
see enclosed letters, Atlas Copco Turbonetics, Inc., dated December 22, 1981, to the NRC; and [[letter::AECM-81-509, Responds to NRC Request for Addl Info Re SER Item 1.10(13), RHR & ECCS Pump Reliability.Util ,Providing Results of 24-h Continuous Run Test on RHR Pump Reflects Confidence in long-term Operability of Pumps|January 19, 1982, letter]] to Bechtel.
Due to the nature of the defect, which is set forth in this report, it has been concluded that this defect does not apply to other Bechtel projects.
7.
The corrective action which has been... taken... and the time...
to complete the action:
a.
The deficiency is limited to the drywell purge compressors used at the GGNS. Bechtel Project Engineering has conducted a review of vendor documents for all other heat exchangers contained in the Standby Service Water System and located in high radiation areas. No teflon coating, or any other unacceptable coatings have been used in the applicable heat exchangers, b.
The vendor has removed the teflon coating from two (GGNS Unit I) of the total of four aftercoolers. The remaining two aftercoolers (GGNS Unit II) have been returned to the vendor for rework.
All actions will be completed prior to Unit II fuel load.
c.
Prevention of recurrence is not applicable to GGNS in that procurement is complete, and the cause was vendor error.
The vendor has been made aware that teflon coatings are not acceptable in high radiation areas.
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bec:
Dr. D. C. Gibbs Mr. D. C. Lutken Mr. J. N. Ward Mr. J. P. McGaughy, Jr.
Mr. J. D. Heaton' Mr. R. Trickovic' Mr. J. W. Yelverton Mr. L. F. Dale Mr. C. K. McCoy Mr.-T..H.-Cloninger Mr. R. A. Ambrosino Mr. J. F. Pinto Mr. G. B. Rogers Mr. S. H. Hobbs Mr. L. E. Ruhland Mr. L. F. Daughtery Mr. A.-G. Wagner Mr. R. F. Phares PRD File Manual File File Mr. D. M. Houston U. S. Nuclear Regulatory Commission Division of Licensing Washington, D. C.
20555 Mr. Bruce J. Cochran Cochran Consulting Company P.O. Box 270503 Tampa, Florida 33688 l
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