TXX-6626, Final Deficiency Rept CP-87-17 Re Operation of Power Supplies Mfg by Validyne Engineering Corp.Initially Reported on 870608.Issue Not Reportable Under 10CFR50.55(e)
| ML20236N005 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/07/1987 |
| From: | Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-17, TXX-6626, NUDOCS 8708110328 | |
| Download: ML20236N005 (1) | |
Text
p Log # TXX-6626
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File # 10110 L
A 907 E
E Ref: 10CFR50.55(e) 1UELECTRIC
^U9" wmiae c. cmmsu Executive Vice President U. S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C. 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) l DOCKET NOS. 50-445 AND 50-446 VALIDYNE.15 VOLT DC POWER SUPPLY SDAR: CP-87-17 (FIHAL REPORT)
Gentlemen:
On June 8,1987, we verbally notified your Mr.' Ian Barnes of a deficiency in the operation of power supplies manufactured by Validyne Engir aering Corporation. The power supply cuntains a 15V DC regulator which can exhibit a high frequency oscillation under certain load conditions. This oscillation would result in a minor zero shift in output of some of the signal conditioning cards. Calibration accuracy is compromised by less than 0.1% by the presence of this c,eillation.
We have evaluated this issue for safety significance and have determined the power supplies which contain the subject regulator are installed-at CPSES in a singular system, the Emergency Response Facility (ERF) computer system. As l
installed, were the deficiency to have remained uncorrected it would not have had an adverse effect on the safety of the plant operations. We have confirmed the specific defective component is not used in a safety-related application.
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We have therefore concluded that this issue is not reportable under the provisions of 10CFR50.55(e).
Records supporting this determination are available for your inspectors to review Lt the CPSES site.
I Very truly your,
/
M W. G. Counsil RSB/mlh c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) 8708110328 870807 DR ADOCK 0500 5
t o 400 North Olive Street LB BI Dallas, Texas 75201 l
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