ML20206B870

Final Deficiency Rept (CDR 84-00-13) Re Control Circuit Cable Lengths.Corrective Actions as Specified in Completed.Solutions Involved Rewiring W/Larger Conductors & Reconfiguration of Some Circuits

ML20206B870
Person / Time
Site:	Seabrook
Issue date:	05/28/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CDR-84--13), (CDR-84-00-13), SBN-1071, NUDOCS 8606190220
Download: ML20206B870 (3)

Text

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SEABROOK STATION Engineering Office i l May 28, 1986 Pubec Service of New Hampshbe SBN- 1071 Mew Hampshire Yonkee Divh T.F. Q2.2.2 United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programs

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter SBN-826, dated June 17, 1985,

" Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths", J. DeVincentis to R. W. Starostecki (c) PSNH Letter SBN-737, dated December 6, 1984,

" Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths", J. DeVincentis to R. W. Starosteck (d) PSNH Letter SBN-709, dated August 30, 1984,

" Interim 10CFR50.55(e) Report: Control Circuit Cable Lengths", J. DeVincentis to R. W. Starostecki Subj ect: Final 10CFR50.55(e) Report: Control Circuit Cable Lengths (CDR 84-00-13)

Dear Sir:

In References (b), (c) and (d), we reported a 10CFR50.55(e) deficiency regarding control circuit cable lengths. During the design process of control circuits for various devices, such as solenoids, relays, etc., portions of the circuit were not considered in all cases when evaluating the total circuit length for voltage drop calculations. Inadequate voltage at the terminals of these devices due to increased voltage drop may prevent the device from performing its intended safety function.

The corrective action as specified in Reference (b) has been completed.

The corrective action included a study to identify all safety-related circuits which could exhibit voltage drop problems. Solutions were then developed to correct the voltage drop problem and ensure adequate voltage at the device terminals.

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United States Nuclear Regulatory Commission Attention: Mr. Richard W. Starostecki The solutions involved rewiring with larger . conductors, development and use of a new relay coil with a lower minimum operating voltage, and reconfiguration of some circuits. This is considered our final report on this item.

Very truly yours, L a4 John DeVincentis Director of Engineering cc: Atomic Safety and Licensing Board Service List i

Director, Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20555 4

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