ML17252B022

RO Inquiry Report 05000249/1972013Q Regarding the Discovery of High Steam and High Condensate Flow Switches to Be Out of Calibration

ML17252B022
Person / Time
Site:	Dresden
Issue date:	09/25/1972
From:	Dance H US Atomic Energy Commission (AEC)
To:	Commonwealth Edison Co
References
IR 1972013Q
Download: ML17252B022 (2)

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U. S. ATOMIC ENERGY COMMISSION DIRECTORATE OF REGULATORY OPERATIONS REGION III RO Inquiry Report No. 050-249/72-13Q

Subject:

Commonwealth Edison Company License No. DPR-25 Dresden Unit 3 Isolation Condenser High Flow Switch Out of Calibration Prepared By: H. C. Dance ' ( Nitv'"""L.....--- ?hf,~7~--

A. Date and Manner AEC was Informed:

i RO:III was informed by T. Watts, Operating Engineer, via telephone on September 25, 1972.

B. Description of Particular Event or Circumstance:

During ,quarterly surveillance testing the isolation condenser IC) high stea.~. and high condensate flow switches were found tci be out of calibration as shown below.

Circuit As Left*Setting As Found Setting Tech Spec High steam flow 417 + 3 inches 426 .5", 435 .O" <425 inches High condensate flow 30 + 1 inch 33.3", 33.5" -~ 32 inches These switches initiate closure of the IC isolation valves in ~vent of line failure.

C. Action by Licensee:

The licensee reset the. switches to the as-left setting shown above when the condition was found. After data was reviewed, it was decided that future settings would be left at 400 +/- 5 inches for steam flow and 28.5 +/-one inch for condensate flow. The licensee intends to report this occurrence in accordance with license requirements.

REGUIATORY OPERATIONS

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• REGION III RO Inquiry Report No. : 050-249/72-13Q Transmittal Dat~: September 25, 1972 Distribution:

RO Chief, Reactor Test and Operations Branch RO:HQ (5)

DR Central Files Regulatory Standards (3)

Licensing (13)

PDR Local PDR NSIC DTIE, OR ..

REC"D & DISTRI~.UTED 9-27-72 to the following Boyd (2) Skovhoft (2)

Muller, H. Denton, Tedesco, Vollmer, Hendrie; Operational Safety Br.*

Docket file ** 50-249

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