ML19309E549

LER 80-007/03L-0:on 800316,while Ultrasonically Inspecting Jet Pump Fixture Beam Assemblies One Through 20,width-wise Crack Indication Discovered Along Upper Surface of Pump 16 Near Bolt.Caused by Intergranular Stress Corrosion

ML19309E549
Person / Time
Site:	Quad Cities
Issue date:	04/09/1980
From:	Robert Murray COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19309E541	List: ML19309E540 ML19309E549
References
LER-80-007-03L-03, LER-80-7-3L-3, NUDOCS 8004220623
Download: ML19309E549 (3)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 21 l While ultrasonically inspectina jet pump fixture beam assemblies 1 throuch 20. under 1 io i3; l General Electric Co. procedure TP-508.0642, a width-wise crack indication along the l 1014l l upper machined surface located near the beam bolt on Jet pump number 16 was I lo isl I discovered. None of the other 19 Jet pump beam assemblies showed any crack l la le l I indications. The indication on jet pump 16 did not lead to jet pump inoperability or l lO { 7 l l Ioss of integrity. l 10181 l l 7 8 9 80 SYSTEM CAUSE CAUSE C OP.* *- VA LV E COCE CODE SUS 00CE COMPONENT CODE SUSC00E SUSCOOE ,

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33 J6 40 42 44 47 CAUSE OEscRIPro : AND CORRECTIVE ACTIONS h l ' i ' l l The cause of the crack has been identified as intarcennolic cerace enerncine  !

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1. LER NUMBER: LER/R0 80-07/03L-0

11. LICENSEE NAME:

Commonwealth Edison Company Quad-Ci ties Nuclear Power Station Ill. FACILITY NAME:

Unit Two IV. DOCKET NUMBER:

050-265 V. EVENT DESCRIPTION:

On March 16, 1980 at 1400, wi th Uni t Two shutdown for refuel, special General Electric Procedure TP-508.0642 was performed to inspect Recirculation Water Jet Pumps I through 20. This procedure provides for ultrasonically examining jet pump fixture beam assemblies.

During the course of this inspection, the beam fixture on jet punp number 16 was discovered to have a width-wise crack indication along the upper machined surface located near the beam bolt. None of the other 19 beam jet pump assemblies showed any indication of cracks.

Work request number Qo4198 was written to replace the beam fixture.

A new beam assembly on jet pump number 16 was installed by March 24.

VI. PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The jet pump beam fixture is designed to wi thstand the combined loadings from differential pressure and temperature, fluid movement, and vibration wi thout failure or loss of integrity. The affected fixture did not lead to jet pump inoperability of loss of integrity.

The jet pump hold-down components maintained the capabili ty to perform their design function. Thus, there were no unsafe conditions during previous periods of reactor power operation based on this occurrence.

Vil. CAUSE:

An investigation of this jet pump beam fixture and cracked jet pump beam fixtures f rom the Dresden Station is being performed at the General Electric Company Vallecitos Nuclear Center. The cause of the crack has been identified as intergranular stress corrosion cracking (IGSCC).

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t VIII. CORRECTIVE ACTION:

t The complete ultrasonic inspection of the Unit Two jet pump assemblies and replacement of the cracked beam assembly is deemed -

adequate immediate corrective action. A similar ultrasonic I inspection will be performed on the Unit One jet pump assemblies  ;

during the next scheduled refueling outage in the fall of 1980. .

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