ML20234C566

Forwards Util 720429 Rept Re Heat Tracing on Suction Piping of Standby Liquid Control Sys Failure.W/O Encl

ML20234C566
Person / Time
Site:	05000000, Quad Cities
Issue date:	05/09/1972
From:	Skovholt D US ATOMIC ENERGY COMMISSION (AEC)
To:	Seiss C Advisory Committee on Reactor Safeguards
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References
FOIA-87-40 NUDOCS 8707060537
Download: ML20234C566 (2)

Text

fWh UNITED STATES 1

k' ATOMIC ENERGY COMMISSION I*l(b

• .l WASH INGTON, D.C.

20545

%,b D y RECEIVED

%n e May 9, 1972 Docket No. 50-265

/3Vl5Ukk'L0b?dtE O EACTC ' S AFEGUAF.DS Dr. Chester P. Siess Chairman, Advisory Conrnittee on Reactor Safeguards U. S. Atomic Energy Coranission Washington, D. C.

20545

Dear Dr. Siess:

Sixteen (16) copies of the following are transmitted for the Comnittee's information:

Letter from Commonwealth Edison Company dated April 29, 1972. reporting that the heat tracing on the suction piping of the Standby Liquid Control System at Quad Cities Nuclear Power Station Unit No. 2 was found to be inoperable.

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' /:S > Yh Donald J. Skovholt Assistant Director for Reactor Operations Division of Reactor Licensing

Enclosures:

As stated

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OFFICIAL WBE ONLY SUPPLEMENT NO. 154 CATEGORY B Quad cities 2 29 t

June 6, 1972 1901 & ACRS lisat Tracinz Failur_e__

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By letter dated April 29, 1972, Cosmoonwealth Edison re-ported on the failure of the standby liquid control sys-tem heat tracing (previously reported by TWX).

The failure was discovered upon activation of the low temperature alarm.

The system was found to be inoperable because the power supply cable had never been installed; during the winter months the plant heating system had kept the SBLC system above the 710F alarm point, however. The construc-tion and pre-operational tests had been signed off, indi-cating that "the standby liquid control pump suction lines from the tank have tracing elements installed".

The system has now been made operable and the SBLCS tested satisfactorily.

A discussion with the Regulatory Staff is recoaumended in order to explore vbether there are, or should be, some Senersi approaches used during acceptance;, preoperational or in-service testing for establishing the satisfactory operation of temperature-controlling devices in,the pre-sence of temporarily higher ambient temperatures.

Other process variables might also be included.

E 10N ACRS review is recommaanded.

The enclosed material should be retained until the recom-mended ACRS review has been completed.

WL FILE:

Quad Cities 2 Project & Category B Files omet >

..... ACRS..

SUINAME >

0 DI 6/6/72 DATE >

Form AIC-SIB (Rev. 9-53) AICM 0240 U. S. nWFHNMEN1 PRINTING OFFICE : 1970 0 - 405 346

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