ML20236B358
| ML20236B358 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 10/14/1987 |
| From: | Joyce J, Worthy J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20236B339 | List: |
| References | |
| 241.4(B), 241.4(B)-R, 241.4(B)-R00, NUDOCS 8710260119 | |
| Download: ML20236B358 (7) | |
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TVA EMPLOYEE CONCERNS REPORT NUMBER:' 241,4(B)
SPECIAL PROGRAM REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUMBER: 0 l
i TITLE:'
CABLE TERMINATION AND SPLICES-l Amphenol Connector i'
PAGE 1 0F 7 REASON FOR REVISION:
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TVA~ EMPLOYEE CONCERNS REPORT: NUMBER:' 241.4(B)-
SPECIAL PROGRAM-REVISION NUMBER: 0 PAGE 2 0F 7 1.
CHARACTERIZATION OF ISSUES:
i Concerns:
Issues:
1 BMP-85-001 a.
Vendor supplied amphenol connectors
" Installation method of amphenol are inadequately installed on-connectors on actuators of actuators-of the standby diesel
. standby diesel generator could generator.
contribute to unreliable opera-tion of the diesels."
b.
Inadequate installation could contribute to unreliable operation of the diesels.
2.
HAVE ISSUES BEEN IDENTIFIED IN ANOTHER SYSTEMATIC ANALYSIS? YES NO X Identified by Not applicable Date Not applicable fg;pg Documentation Identifiers:
Qy 3.
DOCUMENT NOS., TAG NOS., LOCATIONS OR OTHER SPECIFIC DESCRIPTIVE IDENTIFICATIONS STATED IN ELEMENT:
No further information available.
4.
INTERVIEW FILES REVIEWED:
File BMP-85-001 was reviewed and no additional unreviewed information for Sequoyah regarding this concern was identified.
5.
DOCUMENTS REVIEWED RELATED TO THE ELEMENT:
See Appendix A.
6.
WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS OR OTHER APPLY OR CONTROL IN THIS AREAT l
See Appendix A.
l 05800 - December 18, 1986
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TVA EMPLOYEE CONC' ERNS REPORT. NUMBER: 241.4(B)
S SPECIAL' PROGRAM l
REVISION NUMBER: 0
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l PAGE 3 0F-7 17.
LIST REQUESTS FOR INFORMATION, MEETINGS, TELEPHONE CALLS, AND OTHER DISCUSSIONS RELATED TO ELEMENT.
-See Appendix A.
8.
EVALUATION PROCESS:
i Reviewed available transcripts of NRC investigative a.
interviews for additional information regarding this concern.
i b.
Reviewed existing reports (e.g., BMP-85-001), f indings, and j
responses to findings to assess their adequacy and the extent to which they satisfy the employee concern.
Reviewed existing TVA Construction, QA/QC, Operations, and c.
Material Control reports for TVA Employee Concerns Special' Program for applicability to the concerns discussed in this report.-
d.
Reviewed standard site procedures, including maintenance f 'A requests, to assess adequacy of corrective action.
0 D~
Assessed overall adequacy of current amphenol connector e.
installation on standby diesel generator actuators.
9.
DISCUSSION, FINDINGS, AND CONCLUSIONS:
Chronology:
08/27/85:
PRO-1-85-272 issued on 2B-B D/G because of connector problem 09/04/85:
PRO-1-85-288 issued due to concern of all loose connectors 09/06/85:
Maintenance Requests (MRs) written to install Raychem ziplock sleeve on all connectors 09/06/85:
Notification to NRC from Power System (PS) under 10CFR Part 21 provisions 09/11/85:
Purchase order for adapters (08/22/85) amended to include wiring assemblies 09/11/85:
MRs written to install wiring assemblies upon arrival 10/17/85:
New cable assembly installed on D/G 2B-B MR A539668 10/25/85:
New cable assembly installed on D/G 2A-A MR A539669 11/08/85:
New cable assembly installed on 0/G 1A-A MR A539670 11/13/83:
New cable assembly installed on D/G 18-B MR A539671 06/23/86:
Concern received by TVA for SQN h&
05800 - December 18, 1986
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,,1 TVA EMPLOYEE CONCERNS REPORT NUMBER:' 241.4(B) l SPECIAL PROGRAM J
REVISION NUMBER: 0:
1 PAGE 4 0F 7 Discussion:
The concerned individual raised a specific concern that the method of installing amphenol connectors on actuators of standby diesel
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generators is inadequate and could contribute to unreliable l
operation of the diesel generator.
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Inadequate installation of the amphenol _ connectors has been substantiated by several reports. Maintenance Request (MR)
- A560178 (App. A, 5.a; 08/27/85) was issued as a result of Potential Reportable Occurrence (PRO) No. 1-85-272 (App. A, 5.b; 08/27/85) to investigate the problem that occurred when diesel generator (D/G) 2B-B failed to respond correctly during testing per l
surveillance instruction 51-7.1.
The investigation undertaken in i
PRO No. 1-85-272 determined that the electrical connector between
.the control panels and the hydraulic actuator was loose on engine l
2B-B, thus rendering the engine's hydraulic drive motor inoperable.
The problem was acknowledged by TVA. As immediate corrective action, the connector was tightened to ensure proper electrical C3 (l.J
' connection between the control panels and the hydraulic actuator.
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v Subsequently, when the diesels were started, the motor for the hydraulic actuator operated properly.
l PRO No. 1-85-288 (App. A, 5.c; 09/04/85) reported that all of the f
1 connectors were visually checked for the same type of installation. All of the connectors were installed by the vendor 1
with a thread mismatch between the amphenol connector and the conduit fitting.
TVA indicated this mismatch resulted from the vendor _ using National Pipe Threads on the conduit fitting with machine threads on the connector. Several of the connectors were j
loose to the touch, but 28-B was the most critical.
PRO No.
i 1-85-288 also found that force threading of the conduit coupling 1
threads on the amphenol connectors by the vendor during assembly caused the amphenol connector thread failure and that the threads on the back side of the female connectors were stripped and broken.
A 09/06/85 telecopy from the D/G manufacturer Power Systems (PS), a
_i Morrison-Knudson Division, acknowledged the defect as reportable l
under 10CFR21 and indicated that the NRC would be accordingly notified. This notification was given to NRC-on 09/06/85 (App. A, i
5.r).
PS also indicated that in their opinion "ths defect does not render the diesel generator inoperative but recommend that surveillance be immediately initiated and the corrective action (install adapter) be done promptly."
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0580D - December 18, 1986
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' TVA EMPLOYEE-CONCERNS REPORT NUMBER: 241.4(B).
SPECIAL PROGRAM REVISION NUMBER: 0 PAGE 5 0F 7 1
The fi,st step undertaken by TVA to correct this problem was to install a Raychem ziplock sleeve (App. A, 5.j through m) over the connector and conduit coupling for additional support between the connector and the conduit coupling thus ensuring proper electrical
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connection and mechanical strength. This corrective action was completed on 09/07/85. As a permanent fix to prevent recurrence,.
new wiring harnesses were ordered on 09/11/85 from the vendor
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(added to contract #453168) to replace the original defective
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harness assemblies. MRs (App. A, 5.d through g) were issued to 1
install the new wiring harnesses upon-receipt from the vendor.
The replacement work for the last diesel was completed on 12/24/85.
Findinos:
1
.a.
The installation method of amphenol connectors on actuators by the D/G manuf acturer was inadequate; however, TVA.and the manuf acturer acknowledged the problem and took the'necessary corrective actions.
These corrective actions have been implemented and no evidence exists of any remaining inadequate installations.
I b.-
Although the incorrect installation of connectors could have W
contributed to an unreliable operation of the D/Gs, the j
problem was identified during a surveillance test (plant i
standard procedure required per Technical Specification) and j
corrected in a timely manner.
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Conclusion:==
Although the employee concern is valid, the problem was identified independently from the concern during a required surveillance test as required per plant Technical Specification. Also the problem was acknowledged, corrective actions taken very expeditiously, and notification was properly provided to the NRC.
10.
CORRECTIVE ACTION:
No corrective action required.
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0580D December 18, 1986
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' TVA EMPLOYEE-CONCERNS REPORT' NUMBER:. 241.4(B).
t;
.SPECIAL~ PROGRAM REVISION NUMBER: 0 V
PAGE 6 0F 7 APPENDIX A 5.-
DOCUMENTS REVIEWED RELATED TO THE ELEMENT:
Maintenance Request (MR) No. A-560178, (08/27/85) a.
b.
Potential Reportable Occurrence No. I-85-272, (08/27/85)
Potential Reportable 0ccurrence No. I-85-288, (09/04/85) c.
d.
Maintenance Request No. A-539668'(D/G 28-B), (09/11/85)
MaintenanceRequestNo.A-539669(D/G2A-A),(09/11/85) e.
'f.
Maintenance Request No. A-539670 (D/G 1A-A), (09/11/85)'
g.
MaintenanceRequestNo.A-539671,(D/G18-B),(09/11/85) h.
Maintenance Instruction (MI-6.20) R10 " Configuration Control During Maintenance Activities," (10/10/86) i G'
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Surveillance Instruction (SI-7.1), " Diesel Generator AC.
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Electrical Power Source Operability Verification," R7.07/14/86 l
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Maintenance Request No. A-544581, -(D/G 1A-A), (09/06/85) q k.
Maintenance Request No. A-544582, (D/G 16-B), (09/06/85)
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1.
Maintenance Request No. A-544583, (D/G' 2A-A), (09/06/85) 1 Maintenance Request No. A-544584, (D/G 2B-B), (09/06/85) m.
Maintenance Request No. A-539675, (D/G 28-B), (09/12/85) n.
Maintenance Request No. A-539674, (D/G 1B-8), (09/12/85) o.
p.
SQN r, modifications and Additions Instruction M&AI-7,
" Inspection Criteria of Cables-or Internal Panel Wiring," R8, (07/24/86)
Notification from Power System (PS) to NRC Under 10CFR Part r.
21, "TVA c~"Joyah Engine Governor Actuator Electrical Connect. t.' lug" (09/06/85) 0580D - December -18,1986 J
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- t TVA EMPLOYEE CONCERNS REPORY NUMBER: 241.4(B) 1 SPECIAL PROGRAM
)
REVISION NUMBER: 0 l
L PAGE 7 0F 7
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l APPENDIX A (cont'd) i 6.
WHAT REGULATIONS, LICENSING COMMITMENTS, DESIGN REQUIREMENTS OR OTHER APPLY OR CONTROL IN THIS AREA?
Surveillance Instruction (SI-7.1), " Diesel Generator AC Electrical Power Soure.e Operability Verification"
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7.
LIST REQUESTS FOR _INFORMATION, rtEETINGS, TELEPHONE CALLS, AND OTHER f
DISCUSSIONS RELATED TO ELEMENT.
None.
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l OS80D - December 18, 1986 w