05000254/LER-1981-006-03, /03L-0:on 810302,flexible Air Line to Target Rock Main Steam Safety/Relief Valve Found Broken During Routine Insp of Drywell.Caused by Improper Installation of Flexible Air Line.Air Line Replaced W/Longer One

/03L-0:on 810302,flexible Air Line to Target Rock Main Steam Safety/Relief Valve Found Broken During Routine Insp of Drywell.Caused by Improper Installation of Flexible Air Line.Air Line Replaced W/Longer One

ML20003D539
Person / Time
Site:	Quad Cities
Issue date:	03/09/1981
From:	Mendenhall E COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20003D531	List: 05000254/LER-1981-006, Forwards LER 81-006/03L-0 05000254/LER-1981-006-03, /03L-0:on 810302,flexible Air Line to Target Rock Main Steam Safety/Relief Valve Found Broken During Routine Insp of Drywell.Caused by Improper Installation of Flexible Air Line.Air Line Replaced W/Longer One
References
LER-81-006-03L-01, LER-81-6-3L-1, NUDOCS 8103270631
Download: ML20003D539 (3)

LER-1981-006, /03L-0:on 810302,flexible Air Line to Target Rock Main Steam Safety/Relief Valve Found Broken During Routine Insp of Drywell.Caused by Improper Installation of Flexible Air Line.Air Line Replaced W/Longer One

Event date:
Report date:
2541981006R03 - NRC Website

text

U.S. NUCLEAR REGULATORY CoMMISSloN NRC FOT.M 366 a.m s

LICENSEE EVENT REPORT

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3 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h l

During a routine inspection of the Orywell following a reactor shutdown for a short 10121l maintenance outage, the flexible air line to the Target Rock Main Steam Safety /

l g3,3, l Relief Valve was found broken. The consequences of the Target Rock valve failure

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g,32, l are minimized by the continued availability of the Electromatic Relief valves, HPCI,[

g3,3; l and RCIC systems for controlling reactor pressure and level had the need arisen.

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31 40 di 42 43 44 47 CAUSE DESCRIPTibN AND CORRECTIVE ACTIONS h I'631I The cause of the failure was imorocer installation of the flexible air line.

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1: tt1I ai r line was reolaCed with a lonaer one that will allow the line to be lanced to l

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LER HUMBER: 81-6/03L-0 11.

LICENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Power Station Ill.

FACILITY NAME: Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

On March 2,1981, at 11 a.m., during a routine inspection of the Unit One Drywell following a reactor shutdown for a short maintenance outage, the flexible stainless steel pneumatic line to the Target Rock Main Steam Safety / Relief valve operator from the solenoid control valve was found broken. The consequences of this occurrence are minimized Sy the availability and operability of the four electromatic relief valves, HPCI, RCIC, and low pressure ECCS for rea'ctor level and pressure control.

The safety valve function of the Target Rock valve was not affected by this occurrence and remained operable. When the Target Rock was found to be Inoperable and the pneumatic line was replaced prior to reactor startup; Unit operation was in compliance'with Technical Specification 3.5.D.I. at all times.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The Unit One Target Rock valve was last demonstrated operable on December 20, 1980, during startup following a refueling outage. Operability of the Target Rock and the four electromatic relief valves is demonstrated at six-month Intervals, as required by Technical Specification 4.5.D. I.b.

Since the electromatic relief valves, HPCi and RCIC systems were avail-able for controlling reactor pressure and water level, the consequences of this event were minimal.

Vll. CAUSE:

The failure of the air supply to the Target Rock valve operator occurred when a Swagelok coupling separated from a stainless steel flexible hose supplied by Dearborne Valve and Fitting Company. The flexible hose was installed in the line during the last refueling outage as part of Modification M-4-1-80-3 to install seismically qualified supports and a leak-tight check valve for the Target Rock pneumatic supply system (Reference NRC Bulletin 80-01). The flexible hose was installed to pro-vide.ar line expansion and vibration.

It was found that the hose was installed too straight and tight. The connection between the coupling and hose could possibly have failed when the Target Rock valve was tested on December 20, 1980.

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Vill. CORRECTIVE ACTION:

Work Request Qll353 was initiated immediately to replace the broken air line. A longer hose was installed and it was looped to help remove stress

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from the hose. The Target Rock valve was demonstrated operable on March 3,1981, during unit startup following the maintenance outage. The flexible pneumatic air line on Unit Two will be inspected during the next planned outage. Maintenance procedures governing the replacer.ent of Target Rock valves will be reviewed.

I.