05000237/LER-1979-009, Forwards LER 79-009/03L-0

Forwards LER 79-009/03L-0

ML17173A633
Person / Time
Site:	Dresden
Issue date:	02/20/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A634	List: 05000237/LER-1979-009, Forwards LER 79-009/03L-0 05000237/LER-1979-009-03, /03L-0 on 790121:plant Chimney Sampling Sys Operating Incorrectly.Caused by Purge Valve V2 Being Stuck Open
References
79-168, NUDOCS 7902270341
Download: ML17173A633 (3)

LER-1979-009, Forwards LER 79-009/03L-0

Event date:
Report date:
2371979009R00 - NRC Website

text

.. Commonwe-Edison Dresden Nuclear Power Station R.f3. #1 Morris, Illinois 6~50

'felephone 815/942-2920 February 20, 1979 BBS LTR 1179-168 James G. Keppler, Regional Director Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL. 60137' -=~*'.*'**':":.':-:'.'"--

- Region III Reportable Occurrence Report /f79-09/03L-0, Docket 11050-237 is hereby submitted to your office in accorda_nce with Dresden Nuclear Power Station Technical Specification 6.6.B.2. (b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

BBS:lcg

• Enclosure cc:

Director of Inspection & Enforcement Director of Management Information & Program.Control File/NRC

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I While Unit 2 was in steady. state operation and Unit. 3 was in cold shut down, it was found that the plant chimney sampling system was operating:incorrectly. Since the steam jet air ejector monitors were operable the safety significance of this event is*

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from the turbine. building :into the *system.

The replaced valve was inadyertently in-IIIIJ stalled backwards, still allowing building air to be drawn in.

Following repair system flow still low due to plugged filter.

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ATTACHMENT TO LICENSEE EVENT REPORT 79-09/031-0

. COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT -2 * (ILDRS-2)

DOCKET If 050-237 While Unit 2 was in steady state operation and Unit 3.was in cold shutdown, it was determined the plant chimney sampling system was not operating correctly.

Since the steam jet air ejector monitors.

• were operable, the safety significance of this event was minimal.

On 1/21/79, a work request was.initia~ed.. t~ investigate the problem.

It was found that the purge valve V2 was stuck open, allowing turbine build.:ing air to be.corttinuously'.drawri:.ii1to the. system.~'*'J'he:yalye.. ~~~as replaced and the valve which was removed was disassembled. **h\\ias: :>.

foµnd that. the valve stem was bent.. on 1/24/79, another in_;es't..igat.i~ri of a low flow problem revealed that. the valve which had just been re-placed had been installed backwards, and once again*was allowing

~ir from the Turbine Building to be drawn into the system.

Despite the repair of the purge valve, a low flow problem persisted.

Further investigation showed that the particulate filter became plugged very frequently.

water stains could be found on the filters and the filter holder... Apparently* the.moisture of the warm air. from.

the chimney condensed in the sampling pipe due to the extreme cold weather.. It was found that in the original design of the system.

there was a loop drain.

Apparently in a later modification, the.

drain was replaced by a heater.

It is believed that this heater cannot handle the excessive condensation caused by the re.cent ex-cessively cold weather.

An.investigation is under way to. determine if there is a need to reinstall the loop drain..Until the low flow problem is corrected, the filter will be changed more frequently, to avoid moisture saturation.

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