ML20236D077
| ML20236D077 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 07/23/1987 |
| From: | Hood D Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| TAC-64194, TAC-64195, NUDOCS 8707300292 | |
| Download: ML20236D077 (2) | |
Text
_ _ - _ _
i i
e, Docket Nos.: 50-369, 50-370 g
Mr. H. B. Tucker, Vice President Nuclear Production Department Duke Power Company 422 South Church Street Charlotte, North Carolina 28242
]
Dear Mr. Tucker:
m
Subject:
Request for Information Regarding Power Lockout of the Cold Leg Accumulator'Isolatien Valves, McGuire Nuclear Station, 4
m Units 1 and 2 (TACS 64194/64195)
By letter dated December 17, 1986, you requested a change to the McGuire Technical Specifications with regard to the surveillance requirements for power lockout of the cold leg accumulator isolation valves. By letter dated February 13, 1987, you provided anichematic and description of a power lockout circuit x
[n for the cold leg accumulator isolation valves which would be used in conjunction with the proposed surveillance requirements to verify power lockout of the isolation valves. Your Mart.h 2,1987 letter described the means you intend to use to periodically verify the Technical Specification requirements that power L
, to the isolation valves is disconnected.
1 We have reviewed the proposed change and find that the proposed surveillance would not provide a level of assurance that power is disconnected from the isolation valves that is commensurate with the existing surveillance requirement that power be verified disconnected by removal of the breaker from the isolation valve operator circuit. The proposed surveillance would only verify that the power disconnect switch (of the power lockout circuit) is in the disconnect position and that the valve indicator light indicates the valve is open; it would not verify that the power lockout circuit is actually functioning. As a result, several undetected failures could occur, such as n short or malfunction of the switch contacts, which could result in disabling of the power lockout fux: tion.
Accordingly, we request that you provide additional justification for conducting the surveillance as you have proposed, or that you provide a periodic surveillance that actually verifies the proper functioning of the power lockout circuit.
Your tekhonse is requested within 45 days of this letter. Contactmeat(301) 492-896L if you have questions.
- Sir, ly, j
Dar'l Hood, Project Manager 870730029;? h70723 Project Directorate 11-3 fDR ADOCK 0500 9
Division of Reactor Projects I/II cc: See next page DISTRJB_UTION:
i
<Ilacket File)
NRC PDR Local PDR PDII-3 Reading BJYoungblood Reading SVarga/Glainas MDuncan DHood OGC-Bethesda EJordan JPartlow ACRS(10)
JLazevnick FRosa T
.D M V
PDII-3/DRPI/II PDlhDRPI/II PD
/ (PI/II DHood/ rad MUuNcan BJ plbod 1
07/2,7/87 07bJ/87 07
.B7
- f.., ;
!l
//
Mr. H. B.' Tucker Duke Power. Company McGuire Nuclear Station-l cc:.
~
Mr. A.V. Carr, Esq.
Dr. John M. Barry Duke Power Company Department of Environmental Health -
P. O. Box.33189-Mecklenburg County,
422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203 i
County Manager'of Mecklenburg' County 720 East Fourth Street Charlotte, North Carolina 28202 Chairman, North Carolina Utilities Commission Mr. Robert Gill Dobbs Building Duke Power Company 430 North Salisbury Street
. Nuclear Production Department Raleigh, North Carolina 27602 P. O. Box 33189 Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief Radiation Protection Branch l
'J. Michael McGarry, III, Esq.
Division of Facility Services Bishop, Liberman, Cook, Purcell Department of' Human Resources and Reynolds-701 Barbour Drive 1200 Seventeenth Street, N.W.
Raleigh, North Carolina 27603-2008 Washington, D. C.
20036 Senior Resident Inspector c/o U.S. Nuclear Regulatory Commission Route 4. Box 529 Hunterville,~ North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, l
101 Marietta Street, N W., Suite 2900
~
Atlanta,. Georgia 30323 L. L. Williams Area Manager, Mid-Souti; Area ESSD Projects l
Westinghouse Electric Corporation
{
MNC West Tower - Bay 239 P. O. Box 355 Pittsburgh, Pennsylvania 15230 j