ML20137M879
| ML20137M879 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 11/20/1985 |
| From: | Martin T Public Service Enterprise Group |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 8512040025 | |
| Download: ML20137M879 (2) | |
Text
.
g.
y.'
O Public Service Electric and Gas Cornpany Thomas J. Martin 80 Park Plaza, Newark, NJ 07101 201-430-8316 Mailing Address: P.O. Box 570, Newark, NJ 07101 Vica President Engineering and Construction November 20, 1985 Dr. Thomas E. Murley, Administrator U.
S.
Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue King of Prussia, Pennsylvania 19406
Dear Dr. Murley:
NRC INSPECTION REPORT #85-42 NOTICE OF VIOLATION HOPE CREEK GENERATING STATION Your letter dated October 21, 1985, transmitted the above referenced Inspection Report which contained a Notice of Violation citing one (1) item of noncompliance involving inadequate design control for DC control power alarm circuits.
As of July 7, 1985, design of Class lE 480 VAC Unit Substation (USS) Main Control Room annunciator and computer alarm points
(
was not accurately translated into drawings and "as built"
. installation.
Design logic diagram E-3134-0(Q) Revision 7 indicates that on loss of 125 VDC control power to each of the Class lE 480 VAC USS a common main control room annunciator and specific computer alarm points will be actuated.
Electrical Schematic Diagram E-0097-0(Q) Sheet 2, Revision 5, and the as built configuration, show power for the annunciator and computer points supplied by the same 125 VDC source being lost.
On loss of 125 VDC control power, power to corresponding annunciator and computer points is also lost so that no alarm is generated.
Corrective Steps Taken and Results Achieved The design of the alarms for the Class lE Unit Substation (USS) was reviewed and it was determined that these alarms provide the control room operator the status of the USS and the connecting loads.
A Design Change Package (DCP-581) has been issued, changing the alarm power source to the Bailey logic panel.
This design change modifies the alarm circuit to achieve the proper alarm on loss of~125 VDC at the USS.
4 -)
8512040025 851120
~
s PDR ADOCK 05000354 G
pg JE di
i s
Dr.
T.
E.
Murley 2
11/20/85 Corrective Steps Taken to Preclude Recurrence In order to assure that other alarm circuits do not have similar problems, a review of the alarm circuits on all electrical dis-tribution systems was performed.
This review included the alarm circuitry.for the 7.2KV, 4KV, and 480V Unit Substations, all of the DC system and the uninterruptable power supply (UPS) systems.
It was determined that all other alarm circuits complied with the design intent and that the problem identified in the Notice of Violation was unique.
The Date of Full Compliance The Design Change Package (DCP-581) was issued on August 28, 1985.
The Engineering review of other alarm circuits was completed by November 11, 1985.
The modification work will be complete by December 20, 1985.
Very truly yours, C
Office of Inspection and Enforcement Division of Reactor Construction Inspection Washington, D.
C.
20555 NRC Resident Inspector P.
O.
Box 241 Hancocks Bridge, NJ 08038