ML20028C926

Final Significant Const Deficiency Rept 49 Re Time-Trol,Inc Heat Trace Panel Malfunctions.Initially Reported on 821130. Voltage Regulators,Thermocouple Amplifier Boards & Ambient Temp Sensors Replaced by 821124

ML20028C926
Person / Time
Site:	Waterford
Issue date:	12/28/1982
From:	Maurin L LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, W3I82-0152, W3I82-152, NUDOCS 8301140316
Download: ML20028C926 (2)

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Louisiana 242 ocanoNoe Srncer P O W E R & L 1 G H T! p o Box saos . NEW OnLEANS. LoutSIANA 70174 . (504) 366-2345 EuS$sysY$

December 28, 1982 t, y, y4yg,y Vce President Nuclear Operatens W3I82-0152 Q-3-A35.07.49 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

Waterford SES Unit No. 3 --

Dacket No. 50-382 [FKggggg 3 Significant Construction Deficiency No. 49 y Itr - --

" Time-Trol, Inc. , Heat Trace Panel Malfunctions"/

. A - 3198 Final Report .

REFERENCE:

LP&L letter W3182-0120 dated November 30, 1 93 3

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 49, " Time-Trol, Inc., Heat Trace Panel Malfunctions."

If you have any questions, please advise.

Ver truly yours, 1 G L. V. Maurin LVM/ MAL:keh Attachment cc: 1) Director 3) E. Blake Office of Inspection & Enforcement l U. S. Nuclear Regulatory Commission l Washington, D. C. 20555 l

(with 15 copies of report)

2) Director 4) W. Stevenson j Office of Management Information and Program Control U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with I copy of report) r301140316 821229 "l PDH ADOCK 05000382 g PDR

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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 49

."TIME-TROL, INC., HEAT TRACE PANEL MALFUNCTIONS" INTRODUCTION This report is submitted pursuant to 10CFR50.55(e) . It describes deficiencied.in electrical control panels provided by Time-Trol, Inc.,

a subcontractor of Raychem Corporation. The panels are used in heat

. tracing systems in CVCS and B-WMS for Waterford S. E. S. Unit No. 3.

This-problem is considered reportable under the requirements of 10CFR50.55(e). In addition,-the problem was reported to the Nuclear Regulatory Commission by Raychem Corporation pursuant to 10CFR21.

DESCRIPTION OF PROBLEM On. March 9, 1982, a Part 21 report was received advising that the Raychem Corporation had determined that certain problems existed with electrical control panels provided by Time-Trol, Inc. The problems were identified as voltage regulator malfunctions, relay chatter, and differences between the panel that was tested and the panel which was shipped. Premature failure of the voltage regulators would have caused loss of heat tracing monitoring and control. Ambient temperature variations and sensitivity to noise in thermocouple amplifier boards might have caused temperature set point drift and alarm relay chatter.

It has been determined that two Time-Trol panels have been installed on safety related systems (CVCS Panels A and B) and one panel on a non-safety related system (B-WMS). There are 72 temperature control modules and 72 high temperature cut out/ alarm modules on each of the CVCS Panels; there are 28 temperature control modules and 28 high temperature cut off/ alarm modules on the B-WMS Panel.

SAFETY IMPLICATIONS 4

The subject panels provide control for heat tracing installed on piping connecting Boric Acid Make-Up Tanks A and B to the Volume Control Tank.

The failure of panels would result in unavailability of heat tracing of the piping when called for. If left uncorrected, this deviation would adversely affect the reactivity control capability of the plant.

l CORRECTIVE ACTION Non-Conformance Report W3-3548 was initiated to document and track corrective action. Raychem Corporation furnished a disposition, which I' required replacement of voltage regulators, thermocouple amplifier boards and ambient temperature sensors. The replacement voltage regulators had better heat dissipation and higher current carrying capacity. To eliminate relay chatter, Raychem designed and manufactured new amplifier boards, used in conjunction with ambient temperature indicators. These units were subjected to qualification testing, and a

• Certificate of Compliance ~to IEEE 323-74, IEEE 383-74, IEEE 344-75 and Ebasco specification LOU 1564.274B R2'was received.

Corrective action, which consisted of replacement of the above parts on the CVCS A and B Panels and ' the B-WMS Panel, was completed on November 24, 1982. Non-Conformance Report W3-3548 was closed on December 14, H7 1982. This report is submitted as the final report.

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