ML20154S656
| ML20154S656 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 05/24/1988 |
| From: | George Thomas PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Russell W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NYN-88074, NUDOCS 8806090135 | |
| Download: ML20154S656 (3) | |
Text
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5 1, V*
George S. Thomas UI Vice Presidenl Nuclect Production NYN-88074 gg New Hampshire Yankee Division May 24, 1988 United States Nuclear Regulatory Commission Region I 425 Allendale Road King of Prussia, PA 19406 Attention:
Mr. William T. Russell Regional Administrator
References:
a)
Facility Operating License No. NPF-56, Construction Permit CPPR-136, Docket Nos.30-443 and 50-444 b)
PSNH Letter SBN-709, dated August 30, 1984, "Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths," J. DeVincentis to R. W. Starostecki
-4 c)
PSNH Letter SBN-737, dated December 6, 1984, "Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths," J. DeVincentis to R. W. Starostecki d)
PSNH Letter SBN-826, dated June 17, 1985,
' Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths," J. DeVincentis to R. W. Starostecki e)
PSNH Letter SBN-1071, dated May 28, 1986, "Final 10CFR50.55(e) Report: Control Circuit Cable Lengths," J. DeVincentis to R. W. Str.rostecki f)
PSNH Letter NYN-87130, dated Novembr;r 12, 1987, "License Ever.t Report (LER) No. 87 019-00: Failure of Gould/Telemecanique J-10 Relays
- g)
PSNH Letter NYN-87134, dated November 20, 1987, "Revision to 10CFR50.55(e) Report: Control Circuit Cable Lengths (CDR 84-00-13).' G. S. Thomas to ". T. Russell
Subject:
Control Circuit Cable Lengths (CDR 84-00-13)
Dear Sir Reference (g) revised the 10CFR50.55(e) report regarding control circuit cable lengths and identified three Gould/Telemecaniqce J-10 relays that were designated to have a modifiec coil installed as part of the corrective action but still had the original vendor-supplied coil.
Two of these relays have now been modified. A new voltage study shows that the third relay will have sufficient voltage to ensure operation and sufficient margin exists to allow future loads to be added to thr bus. As a result the thir* -elcy vill not require modification.
8806090135 880524 PDR ADOCK 05000443 P
(
g P.O. Box 300. Seabrook, NH 03874. Telephone (603) 474-9574
United States Nuclear Regulatory Commission May 24, 1988 Attention:
Mr. William T. Russell Page 2 The voltage study now indicates that all safety-related J-10 relays as presently installed have the required minimum voltage to ensure proper operation. This study also indicated that less than the specified minimum voltage (102 volts) may occur for Westinghouse contactors-in the control circuits for Control Room air conditioner fans CBA-FN-14A & B and CBA-FN-36A &
.B.
As a result, the voltage available to all other safety-related vendor supplied skids was evaluated. This study indicated that less than the specified 102 volt minimum could also exist for Westinghouse contactors'on the hydrogen recombiner skids.
Modifications to the control room air conditioner fan control circuits have been made to ensure the Westinghouse contactors have sufficient voltage to operate during the cencurrent conditions of low grid voltage and a fully loaded electrical bus.
Corrective actions for the hydrogen recombiner control circuits will be completed prior to entry into Mode 4.
A final report will be submitted when cor.ective actions have been completed.
Should you have any questions regarding this information, please contact Mr. John G. Tefft at (603) 474-9521 extension 4039.
Very truly yours, M
GeoghS. Thomas I
cci Mr. Victor Nerses. Acting Director Project Directorate I-3 Division of Reactor Projects United States Nuclear Regulatory Commission Washington, DC 20555 Mr. A. C. Cerne j
NRC Senior Resident Inspector Seabrook Station Seabrook, NH 03874 l
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