ML20211A250
| ML20211A250 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 02/12/1987 |
| From: | Churchill B GEORGIA POWER CO., SHAW, PITTMAN, POTTS & TROWBRIDGE |
| To: | Edles G, Kohl C, Wilber H NRC ATOMIC SAFETY & LICENSING APPEAL PANEL (ASLAP) |
| References | |
| CON-#187-2511 OL, NUDOCS 8702190125 | |
| Download: ML20211A250 (4) | |
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2 SHAW, PITTMAN, PoTTs & T#0WERIDGE A PARTNgmSwap INCLVOING PROFESSIONA6 ComPONAT, S
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C TELEPuoNE (7os) 7eo-7eoo (202) ees soss February 12, 8h SU E@uCE W. CHURCHILL, P.C.
(202)773 338 Gary J. Edles, Esq., Chairman Christine N. Kohl, Esq.
Atomic Safety and Licensing Atomic Safety and Licensing Appeal Board Appeal Board U.S.. Nuclear Regulatory U.S. Nuclear Regulatory Commission Commission Washington, D.C.
20555 Washington, D.C. 20555 Mr. Howard A. Wilber Atomic Safety and Licensing Appeal Board U.S. Nuclear Regulatory Commission Washington, D.C.
20555 In the Matter of Georgia Power Company, et al.
(Vogtle Electric Generating Plant, Units 1 and 2)
Docket Nos. 50-424 and 50-425 -C6
Dear Administrative Judges:
By letter dated January 15, 1987, Applicants reported to the Appeal Board recent information concerning Limitorque motor-oper-ators at Plant Vogtle.
During oral argument on January 21, 1987, the Appeal Board asked several questions relating to the' January 15 letter.
A review of the January 21 transcript suggests that certain clarifications are indicated. 1/
At pages 33-37 of the transcript, Judges Wilber and Kohl-asked questions concerning Applicants' inspections of the Lim-itorque motor operators.
As safety-related Limitorque motor op-erators were installed and connected, Georgia Power Company 1/
At oral argument, Chairman Edles suggested that parties could comment on NRC inspection and close out reports on the Limitorque matter, but on further review, the Appeal. Board decided such comments were not needed.
Letter from C. Shoe-maker to B. Bordenick (Feb.'5, 1987).
Accordingly, this letter confines itself to statements made during oral argu-ment that require clarification.
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i SHAw, PITTMAN, PoTTs & TROWBRIDGE A PARTNER $Mep INCLUDING PROFES$6CNAL CORPORATIONS 1
Letter to Judges Edles, Kohl, and Wilber February 12, 1987 c
Page 2 performed cable termination inspections.
During these cable ter-mination inspections, Georgia Power' Company discovered burn dam-age,to motor power leads, which are connected internally, in the vicinity of an internal heater element.
Georgia Power Company then performed an engineering evaluation, re-examined a: sample'of motor operators, and reported its discovery to the NRC.
The NRC issued I&E Notice 86-71 as a result.
Georgia Power Company de-termined that the burn damage was caused by the. proximity of the power leads to the heater. element.
Georgia Power Company developed a course of corrective action to include the discon-nection of the heater element-(which was not a'necessary compo-nent) and the inspection of the internal wires in the motor oper-3 ators.2/
An NRC inspection at the end of 1986 examined-Georgia Power Company's corrective action.
The NRC inspector examined seven motor operators and observed.two instances of burn damage on power leads.
One instance was a slight discoloration that had already been detected and evaluated by Georgia Power Company and dispositioned for use as is.
The other occurrence was not re-i flected in the documentation of Georgia Power Company's prior inspections,3/ and on further review Georgia Power Company-learn-ed that several work orders that were prepared to implement the course of corrective action inadvertently omitted a specific in-struction to QC inspectors to inspect the internal wiring of a number of safety-related Limitorque motor operators for burn dam-age.
Georgia Power Company then reinspected the internal wiring of safety-related motor operators for which a specific inspection for burn damage was not clearly documented, with some exceptions 4
noted in the January 15 letter referred to above.
The only two instances of burn damage discovered during this. reinspection were i
on wiring for the disconnected heater element, which is of no consequence.
i 2/
Between the time of the cable termination inspections on the Limitorque motor operators (most of which were-perforved in I
1985) and Georgia Power Company's action taken to correct burn damage, two other inspections of:the internal wiring of Limitorque motor operators were performed at VEGP.
A compo-nent acceptance test, which checked wiring for proper con-l nection, was performed on safety-related motor operators, and an EQ walkdown of safety-related motor operators located in a harsh environment was performed to check the environ-j mental qualification of internal wiring.
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3/
The second occurrence of burn damage found by the NRC in-spector did not require replacing the power lead.
An insu-lating sleeve was placed over the affected area.
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SHAw, PITTMAN, PoTTs & TRDWBRIDGE A PANTNERSMiP aNCLUDSNG PROFESSIONAL ComPQRAT@NS Letter to Judges Edles, Kohl, and Wilber February 12, 1987 Page 3 on pages 32 and 37, Judge ~Wilber asked about the four encapsulated valves which had not been reinspected.
Specifi-
-cally, Judge Wilber asked whether these motor operators would ever be looked at and whether they were the smallest type of motor operator that had the most frequent occurrence of burn dam-age.
Two of the encapsulated motor operators, Model SB-1-60, are attached to the residual heat removal suction valves.
The other two, Model SMB-0-15, are attached to containment spray suction valves.
These four motor operators are not the smallest model, which is the Model SMB-000.
j Each of these valves and motor operators is located just outside containment on a pipe penetrating containment, and each is part of a redundant train.
Each of these four valves, along with the motor operator and the portion of the pipe from the con-tainment penetration to the valve, is enclosed in an encapsulation vessel.
Because they are-encapsulated, these motor operators are not routinely accessible.
The encapsulation ves-o sel, however, can be opened, and the motor operators are subject to regular maintenance and surveillance.
Following oral argument and to put this matter to rest, Georgia Power Company opened up the encapsulation vessels and reinspected the internal wiring of the four motor operators in question.
No burn damage was found on the power leads or other functional wiring.- Burn damage was observed on the disconnected heater circuit wiring in one motor operator, but since that wiring is unnecessary and no longer functional, the discovery has no significance.
i We hope that these clarifications will be of assistance to the Board.
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Sincerel 1
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i Counsel for Applicants cc:
Service List i
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~ UNITED: STATES OF AMERICA' NUCLEAR REGULATORY COMMISSION Mf..
'87 FEB 17 L P5:03 Before the Atomic Safety and Licensing Appeal ~ Board CFFWE M..
..u-00CKEni.G1 MMviCL In_the Matter of
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BRAsco i
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GEORGIA-POWER COMPANY, et.al.
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Docket'Nos. 50-424.
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50-425 (Vogtle Electric Generating Plant, )
Units 1 and 2)
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SERVICE LIST Gary J. Edles, Chairman Bernard M. Bordenick,-Esquire t
j Atomic Safety and' Licensing Office of the Executive Appeal Board Legal-Director U.S. Nuclear Regulatory Commission U.S. Nuclear. Regulatory Washington, D.C.
20555 Commission j
Washington, D.C.
-20555
- Christine N. Kohl i
Atomic Safety and Licensing Bradley Jones, Esquire Appeal Board Regional Counsel l
1 U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory j
Washington, D.C.
20555
. Commission-j 101 Marietta Street,. Suite 3100
- Howard A. Wilber Atlanta, GA 30303 l
Atomic Safety and Licensing Appeal Board
.Danny Feig U.S. Nuclear Regulatory Commission 1130 Alta Avenue i
[
Washington, D.C.
20555 Atlanta, GA 30307 i
l Morton B. Margulies, Chairman Atomic Safety and Licensing I
Atomic Safety and Licensing Board Panel Board U.S.' Nuclear Regulatory.
U.S. Nuclear Regulatory Commission Commission i
Washington, D.C.
20555 Washington, D.C.
20555' I
i Gustave A. Linenberger Atomic Safety and Licensing i
Atomic Safety and Licensing Appeal Board Panel l
Board U.S. Nuclear' Regulatory l
U.S. Nuclear Regulatory Commission Commission Washington, D.C.
20555 Washington, D.C.
20555 4
Dr. Oscar H. Paris-Docketing and Service Section I
Atomic Safety and Licensing Office!of the Secretary Board U.S. Nuclear Regulatory l
U.S. Nuclear Regulatory Commission Connission Washington, D.C.
'20555 Washington, D.C.
20555 H. Joseph Flynn, Esq.
Carol Stangler Assistant General Counsel 425 Euclid Terrace Federal Emergency Management Agency Atlanta,1L4 -30307 500 C. Screet, S.W.
l Washington, D.C.
20472 -
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