TXX-6175, Interim Deficiency Rept CP-86-18 Re Difficulties in Starting & Operating Safety Chilled Water Chiller Units.Initially Reported on 860521.Detailed Review of Vendor Specs & Updating of Components List Continuing.Next Rept by 870309

Interim Deficiency Rept CP-86-18 Re Difficulties in Starting & Operating Safety Chilled Water Chiller Units.Initially Reported on 860521.Detailed Review of Vendor Specs & Updating of Components List Continuing.Next Rept by 870309

ML20207C438
Person / Time
Site:	Comanche Peak
Issue date:	12/18/1986
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-86-18, TXX-6175, NUDOCS 8612300147
Download: ML20207C438 (1)

Text

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Log # TXX-6175 File # 10110 909.4 TEXAS UTILITIES GENERATING COMPANY REYWAY TOWER . 409 780RTH OLIVE STREET.1.B. 88 . DALLAS. TMLAS TH98 December 18, 1986 2@M OVE i WI.LLIA.'1.

. . m. . C C.O.U..N.S.IL DEC I 91986 Mr. Eric H. Johnson, Director y Division of Reactor Safety and Projects -

U.S. Nuclear Regulatory Commission .

611 Ryan Plaza Drive, Suite 1000 Arlington, TX 76011

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 SAFETY CHILLED WATER CHILLER UNITS SDAR: CP-86-18 (INTERIM REPORT)

Dear Mr. Johnson:

On May 21, 1986, we notified you that the issue involving difficulties in starting and operating the safety chilled water chiller units was reportable under the provisions of 10CFR50.55(e). This issue identifies the failure of the Component Cooling Water (CCW) supply to maintain its temperatures at or above the chilled water return temperature for both the operating and standby chillers. We have submitted interim reports logged TXX-4875, TXX-4934, and TXX-5027 dated June 26,1986, July 24,1986, and September 17, 1986, respectively. On December 17, 1986 we verbally received an extension for submitting this response to December 19, 1986.

Currently, we are continuing detailed review of vendor specifications and updating the list of components serviced by the component cooling water system. The supplier (York) is also continuing the evaluation of the installation of the chiller flow control valves with regard to a standby, non-operating safety chiller. Westinghouse is also continuing to evaluate the impact of the 400F CCW temperature on NSSS components.

We anticipate completing the evaluations by February 16, 1987, and submitting our next report by March 9, 1987.

Very truly yours, G. S. Keeley -

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