ML20211C144
| ML20211C144 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/13/1987 |
| From: | Parkinson, Stewart D, Violette J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20211C076 | List: |
| References | |
| 241.5(B), 241.5(B)-R, 241.5(B)-R00, NUDOCS 8702200022 | |
| Download: ML20211C144 (8) | |
Text
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 241.5(B) i SPECIAL PROGRN4 REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUMBER: 0 TITLE:
CABLE TEMINATION AND SPLICES Wire Corrosion and Deterioration PAGE 1 0F 7 of Sealant Material REASON FOR REVISION:
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 241.5(B)
SPECIAL PROGRAN REVISION NUMBER:
0 PAGE 2 0F 7 1.
CHARACTERIZATION OF ISSUES:
Issues:
Concern:
a.
Corrosion of wiring in ECTG-6
" Corrosion of wiring through the feedthroughs (modules) of the the penetration, breakdown of electrical cable containment the sealant that is potted around penetrations caused by breakdown of the conductors as part of the insulation or wrong application.
penetration, resulting from Deterioration of sealant material in breakdown because of the environ-b.
ment, they either violated --
the feedthroughs (modules) of the electrical cable containment used the wrong one, wrong application -- a breakdown of penetrations.
insulation, wrong application."
YES NO X HAVE ISSUES BEEN IDENTIFIED IN ANOTHER SYSTEMATIC ANALYSIS?
2.
Identified by Hone (I
DOCUMENT NOS., TAG NOS., LOCATIONS OR OTHER SPECIFIC DESCRIPTIVE 3.
IDENTIFICATIONS STAltu IN ELEMENT:
No further information is available. The employee concern, although applicable to Watts Bar, is considered generically
- 3 applicable to Sequoyah.
4.
INTERVIEW FILES REVIEWED:
File for ECTG-6 was reviewed, and no additional unreviewed information for Sequoyah was identified.
5.
DOCUMENTS REVIEWED RELATED TO THE ELEMENT:
See Appendix A.
0972D (02/02/P7)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 241.5(B)
SPECIAL PROGRAM REVISION NUMBER: 0 PAGE 3 0F 7 6.
WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS, OR OTHER APPLY OR CONTROL IN THIS AREA?
See Appendix A.
7.
LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELAnu TO ELEMENT.
See Appendix A.
8.
EVALUATION PROCESS:
a.
Reviewed available transcripts of NRC investigative interviews for additional information on the concern.
b.
Reviewed Condition Adverse to Quality (CAQ) data base for
" electrical penetrations" for reports applicable to this concern.
b Reviewed Environicental Qualification Binders for electrical c.
penetrations for documentation applicable to this concern.
d.
Reviewed existing TVA Construction, QA/QC, Operations, and Material Control Reports for the TVA Employee Concerns Special Program for applicability to the concerns discussed in this report.
e.
Assessed validity of the concern and determined whether corrosion of' wiring and/or deterioration of sealant in penetration feedthroughs (modules) in containment penetration exist at Sequoyah.
9.
DISCUSSION, FINDINGS, AND CONCLUSIONS:
Chronology:
11/22/77:
NRC IE Bulletin No. 77-06 reported a condition of decreased insulation resistance between conductors in low voltage penetration modules of General Electric Series 100 penetrations 09720 (02/02/P7)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 241.5(B)
SPECIAL PROGRAM REVISION NUMBER: 0 PAGE 4 0F 7 02/02/86:
NRC W-356-P R0 identifies crazed and/or cracked sealant material on the end of CONAX penetration feedthroughs (modules) 11/86:
Concern ECTG-6 received by TVA Discussion:
The concerned employee raised two generic problems that corrosion of wiring and deterioration of sealant in penetration feedthroughs (modules) may exist in the electrical cable containment The evaluation team reviewed documents that could penetrations.
indicate penetration failures related to the employee concern (EC).
The evaluation team reviewed the Condition Adverse to Cuality data base (CAQ) (App. A, 5.a dated 12/10/86) for " Electrical Penetrations" to determine if any reports identify deficiencies similar to the EC. The only report potentially applicable to the EC was NCR W-356-P R0 ( App. A, 5.b) issued on February 28,1986 on Watts Bar identifying crazing and/or cracking of the sealant material on the end of the CONAX penetration feedthroughs p'
(modules). The crazing and/or cracking was discovered while the penetrations and enclosures were being cleaned.
CONAX personnel inspected representative samples of the penetrations and determined that the NCR condition will not impair the qualification and integrity of the penetration feedthroughs and no corrective action is required on the sealant material.
The inspection and conclusion is documented in CONAX letter to W. S. Raughley ( App. A, 5.c) dated June 30,1986.
l On January 9,1987 the evaluation team reviewed the Licensing Events Reports for Sequoyah ( App. A, 7.a)'.
No reportable occurrence was attributable to corrosion of wiring and/or breakdown l.
of sealant material in penetration feedthroughs (modules) in containment penetrations.
Similarly on January 9 and 20,1987 the evaluation team reviewed the field verification walkdowns perfonned on the CONAX and Westinghouse containment penetrations as part of the environmental qualification program ( App. A, 7.b and 7.c).
There were no indications of deficiencies similar to those outlined in the EC or in NCR W-356-P R0 (App. A, 5.a).
09720 (02/02/87)
+
TVA EMPLOYEE CONCERNS REPORT NUMBER:
241.5(B)
SPECIAL PROGRAM REVISION NUMBER:
0 PAGE 5 0F 7 A review of the Maintenance Records ( App. A, 7.d) by the evaluation team on January 9,1987 identified no records of repairs related to corrosion of wiring and/or breakdown of sealant material in penetration feedthroughs (modules) of the containment penetrations.
NRC IE Bulletin No. 77-06 ( App. A, 5.d,11/22/77) " Potential Problems with Containment Penetration Assemblies" reported a condition of decreased insulation resistance between conductors in low voltage penetration modules of General Electric Series 100 containment penetrations.
The penetrations used on Sequoyah are manufactured by Westinghouse and CONAX.
The evaluation team reviewed the results of the investigations by TVA ( App. A, 5.e) of the problem outlined in the bulletin and concluded that the problem does not exist in the Sequoyah penetrations (because of difference in design) and the problem is not similar to the EC.
Findings:
The alphabetic identifiers below correspond to the list of issues in Section 1.
I The assessed documents did not reveal any deficiency similar a.
to the issue of corrosion of wiring in feedthroughs (modules) of the electrical cable containment penetrations.
b.
The assessed documents with the exception of NCR W-356-P R0 r
(App. A, 5.b) did not reveal any deficiency similar to the y
issue of deterioration of sealant material in the feedthroughs (modules) of the electrical cable penetrations.
CONAX, the manufacturer of the penetrations, detennined that the deficiencies identified in NCR W-356-P R0 on Watts Bar do not affect the performance of the penetrations and no corrective action is required.
==
Conclusion:==
On the basis of the evaluation ccnducted, the issue raised by the employee concern is not valid.
The evaluation team found no evidence of containment penetration problems or failures directly related to the employee concern.
10.
CORRECTIVE ACTION:
No corrective action is required.
09720 (02/02/87)
4 TVA EMPLOYEE CONCERNS REPORT NUMBER:
241.5(B)
-SPECIAL PROGRAM REVISION NUMBER: 0 PAGE 6 0F 7 APPENDIX A E.
DOCUMENTS REVIEWED RElf.TED TO THE ELEMENT:
a.
Condition Adverse to Quality data base for " Electrical Penetrations," (12/10/86) b.
NCR W-356-P R0, (B26860407018), (02/28/83)
Letter from CONAX to W. S. Raughley, TVA, " Evaluation of c.
Cable Coating in Conjunction with CONAX Feedthroughs,"
(B26 860710 002), (06/30/86)
'd.
NRC IE Bulletin No. 77-06, " Potential Problems with Containment Electrical Penetration Assemblies," (11/22/77)
Environmental Qualification Packages, TAB J, Binder No.
e.
SONEQ-PENE-002, SQNEQ-PENE-003, SQNEQ-PENE-004, and SQNEQ-PEljE-005 f.
Letter from G. R. McNutt, TVA, to G. L. Parkinson, Bechtel,
(
(U10 861126 801), (11/26/86)
Letter from B. J. Youngblood, NRC, to S. A. White, TVA g.
(B45 860714 832), with the attached transcript of the investigative interview conducted by the NRC on 02/21/86 at the First Tennessee Bank Building in Knoxville, TN (06/23/86) 6.
WHAT REGULATIONS, LICENSING CCMITNENTS, DESIGN REQUIREMENTS, OR OTHER IPPLY OR CONTROL IN THIS AREA?
[
a.
IEEE Standard 317-1972, Standard for Electrical Penetration f
Assemblies in Containment Structures b.
10CFR50.49, Environmental Qualification of Electrical Equipment Important to Safety for Nuclear Power Plants c.
SNP FSAR, Section 8.3 0972D (02/02/87)
TVA EMPLOYEE CONCERNS REPORT NUMBER: 241.5(B)
SPECIAL PROGRAM REVIS10t! NUMBER: 0 PAGE 7 0F 7 APPENDIX A (cont'd)
~
LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE' CA'LLS, AND OTEER 7.
DISCUSSIONS RELATED TO ELEMENT.
Bechtel memo from S. Mabie to I. Don-Doncow, "Results of a.
Review of Licensing Event Reports," IOM 532, (01/09/87) b.
Bechtel memo from S. Mabie to I. Don-Doncow, "Results of Review of Environmental Qualification Records for Westinghouse Containment Penetrations," IOM 528, (01/09/87)
Bechtel memo from S. Mabie to U. Rieder, "Results of Review c.
of Environmental Qualification Records for CONAX Containment Penetrations," IOM 550, (01/20/87) d.
Bechtel memo from L. D. Knudsen to I. Don-Doncow, "Results of Review of Maintenance Records," IOM 529, (01/09/87)
Bechtel memo from L. D. Knudsen to I. Don-Doncow, "CONAX e.
Penetrations Used in Lieu of Westinghouse Penetrations,"
('
IOM 531, (01/09/87) s a
- i i
0?720 (02/02/67)
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TENNESSEE VALLEY AUTHORITY PAGE EFERENCE
- ECPSI20J-ECPS121C REQUENCY
- REQUEST OFFICE OF NUCLEAR PDHER RUN TIME - 13 2 05 NP - ISSS - RHM EMPLOYEE CONCERN PROGRAM SYSTEM (ECPS)
RUN DATE - 12/0 56 LIST OF EMPLOYEE CONCERN INFORMATION TEGORY EN DES PROCESS & OUTPUT SUBCATEGORYa'00000 KEYHORD A S
GENERIC H
APPL QTC/NSRS P
Kf.YHORD B CONCERN SUB R PLT BBSH-INVESTIGATION S
CONCERN
'KEYHORD C NUMBER CAT CAT D LOC FLQB REPORT R
DESCRIPTION KEYHORD D
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?Atos F yyYY CTG-6 EH 89697 N HBN Ji 4-WTM SS CONCERN INVOLVES CORRDSION OF HIRING THROUGH THE PENETRATIONS, BREAKDOWN K-FORM OF THE SEALANT THAT IS POTTED AROUN F THE CONDUCTORY AS PART,0F THE PENE TRATION, RESULTING FROM BREAKDOHN BE CAUSE OF THE ENVIRONMENT, THEY EITHE R VIOLATED-USED THE HRONG ONE, HRONG i
APPLICATIONS-A BREAKDOHN OF INSULAT ION, HRONG APPLICATION. (REF: HRC LE TTER FROM B. J. YOUNGBLOOD TO S. A.
WHITE DATED JUNE 23, 1986. RIMSS A02
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