ML20084S602

AO 50-265/75-42:on 751018,differential Pressure Across B Train of Standby Gas Treatment Sys Exceeded Tech Spec Limit. Caused by Fouling of High Efficiency Prefilter.Filter Changed & Tested Satisfactorily

ML20084S602
Person / Time
Site:	Quad Cities
Issue date:	10/28/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S605	List: ML20084S602 ML20084S612
References
AO-50-265-75-42, NUDOCS 8306170130
Download: ML20084S602 (3)

Text

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O REPdRT NUMBER: A0 50-265/75-42 REPORT DATE: October 28, 1975 '

i OCCURRENCE DATE: October 18, 1975 FACILITY: Quad Cities Nuclear Power Station

• Cordova, IL 61242 I IDENTIF1 CATION OF OCCURRENCE: h The B Stand-By Gas Treatment (SBGT) System High Efficiency Prefilter dif ferential pressure exceeded the Technical Specification IJmit. 3

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'CONDtTIONS PRIOR TO OCCURRENCE:

Unit Two was in the cold shut down condition for core maintenance. f DESCRIPTION OF OCCURRENCE:

At 7:00PM on October 18, 1975, the B SBGT System was observed to be operating at l

a flow of less than 4000 SCFM. An operator was sent to check the differential l

pressure across the train, and found that it exceeded the Technical Speci fication limit. The A SBGT System was tested and found to be operable. Work Request

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4093-75 was written to replace High Efficiency Prefilter 1/2 B-7502.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE: ,

l The apparent cause of this occurrence is designated as equipment failure. The High Efficiency Prefilter di fferential pressure had ' increased due to fouling.

The SBGT system flow thus decreased proportionately.

ANALYSIS OF OCCURRENCE:

The Stand-By Gas Treatment System consists of two 100% capacity trains. dnly one train is required to maintain secondary containment, immediately after the "B" SBGT prefilter was found to exceed the Technical Specification limits, the A SBGT System was tested and found to be operable. Additionally, the "B" Train was still-able to operate at approximately 3700 SCFM. Since one train was completely operable, and the second train was partially operable, and secondary containment was not compromised, the health and safety of the public was not affected as a result of this occurrence. 1 CORRECTIVE ACTION:

On At' 10:15PM the B SBGT System was taken out of service to change the filter.

October 19, 1975, the train was returned to service and tested satisfactorily.

FAILURE DATA:

On one previous occasion, t'he "B" SBGT System was found to have low flow due to a high filter di f ferential pressure. Surveillance The testing and system operation are system redundancy provides adequate to determine this type of failure. fa i lu res' sufficient capacity to allow maintenance to be performed to correct that occur. ,

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NAME: N7 ' W f ** * ' ' ? PHONE:

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.' - Comm Ilth Edison i

U/ Ouad C uclear Power Station Post Office Box 216 l { ,

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Cordova,lihnois 61242 I s

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NJK-75-536 October 28,.1975 ,

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Director of Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Reference:

quad-Cities Nuclear Power Station Docket No. 50-265, DPR-30, Unit 2 Appendix A, Sections 1.0.A.2, 3 7.B.1, 6.6.B.2.a

-Enclosed please find Abnormal Occurrence Report No. 50-265/75-42 for quad-Cities Nuclear Power Station. This occurrence was previously reported to

' Region ill, Office of Inspection and Enforcement by telephone on October 20, 1975 and to you and Region lil, Office of Inspection and Enforcement by telecopy on October 20, 1975 This report is' submitted to you in. accordance with the requirements of Technical Speci fication 6.6.B. I .a.

Very truly yours,

' COMMONWEALTH EDISON COMPANY QUAD-CITIES NUCLEAR POWER STATION f

ff /AY N.J. Kallvianakis Station Superintendent NJK/TPJ/vmb cc: Region li t, Office of Inspection and Enforcement

• G. A. Ab re l l

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