ML17256A681
| ML17256A681 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 05/02/1983 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML17256A682 | List: |
| References | |
| NUDOCS 8305130084 | |
| Download: ML17256A681 (8) | |
Text
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ACCESSIONi NBR'8305430084'.
DOCt,DAiTEIe 83/05/02.
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89 EAST AVENUE, ROCHESTER, N.Y. 14649 JOHN E.
MA IER VICE PRESI OENT TCLEPHONE AREA CODE 7I& 546.2700 May 2, 1983 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Response
to Telephone Inquiry by George Dick and Mare Wigdor (NRC) on Fuse Coordination for Control Circuits for LCV-427 R.
E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Crutchfield:
In response to a telephone inquiry by George Dick and Mare Wigdor on March 1,
- 1982, RG&E has conducted tests to verify the fuse coordination on the control circuit for LCV-427.
A short circuit analysis was performed to determine the magnitude of fault, current in the circuit.
This analysis is summarized in the enclosed memorandum from Baker to Daniels, dated April 19, 1983.
Tests were then performed on the fuse combination protecting the circuit, to verify that the one amp fuse would open and isolate the fault prior to the main control fuses opening.
These tests, summarized in the enclosed memorandum from Baker to Daniels, dated April 15,
- 1983, demonstrated proper fuse coordination over a range of fault currents from 10 to 60 amps.
The maximum fault current is 56 amps.
Therefore, RGEE concludes that the fuse coordination is proper.
A copy of the Test Report is also enclosed.
Very truly yours, Enclosures
'305130084 830502 PDR ADOCK 05000244 P,,
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ROCHESTER GAS AND ELECTRIC CORPORATION INTEROFFICE CORRESPONDENCE April 15, 1983
SUBJECT:
LCV-427 Fuse Coordination Ginna Station TO:
G. N. Daniels On March 1,
- 1983, George Dick and Mare Wigdor (NRC) questioned the ability of 1 amp fuses installed in the control circuit of LCV-427 to isolate a failed portion of the circuit before blowing the main control fuses.
During March 21-24, fuse co-ordination tests were performed by RG&E Electric Lab over the range 10-60 amps.
The maximum calculated fault current is 56.05 amps.
Test results are documented in the attached RG&E Electric Lab Test Report No. 0383-03.
The report documents 23 successful trials from 10-60 amps in which the AGC-1 amp fuse cleared leaving the NON-3 amp fuse unaffected.
It is therefore concluded that AGC-1 amp and NON-3 amp fuses provide proper protection for LCV-427 control functions.
Ginna Station will be directed to maintain these fuse types to ensure proper protection of LCV-427 control circuitry.
Attachment xc:
Elec.
Eng. File w/o attach.
,Richard A. Baker
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ROCHESTER GAS AND ELECTRIC CORPORATION INTEROFFICE CORRESPONDENCE April 19, 1983
SUBJECT:
LCV-427 Fuse Coordination Ginna Station TO:
G.
W. Daniels In my memo to you dated 4/15/83, I indicated that the maximum fault current in the LCV-427 ~control circuit due to shorting of the valve solenoid was 56.05 amps.
This fault current is based on the following analysis.
R due to 1000 ft. of gl2 AWG wire 9 1.75 ohm/Mft.
R due to two 1
amp AGC-1 fuses 9 0.18 ohm each R due to two 3
amp NON-3 fuses 9 0.06 ohm each 1.75 ohm 0.36 ohm 0.12 ohm R Total 2.23 ohm Fault Current,
=
circuit volta e
= 125 VDC
= 56.05 amp circuit resistance 2.23 ohm The fuse coordination tests performed by RGSE Electric Lab on March 21-24 demonstrated the ability of the AGC-1 amp fuse to interrupt a fault current of 60 amps without affecting a
3 amp fuse in series, therefore, the AGC-1 is considered to provide proper protection of the LCV-427 control circuit against a short circuit. of the valve solenoid.
Richard A. Baker xc:
File/EWR 3257 Elec.
Eng. File
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