ML20084J738

AO 2-72-4:on 720428,during Jet Pump Flow Comparison Checks, Jet Pumps 19 & 20 Indicated Flow Rates at 50% of Other Pumps.Caused by Foreign Matl Obstructing Flow.Pump 20 Removed & Flushed & Startup Program Continued on 720502

ML20084J738
Person / Time
Site:	Quad Cities
Issue date:	05/08/1972
From:	Palmer F COMMONWEALTH EDISON CO.
To:	Block E US ATOMIC ENERGY COMMISSION (AEC)
References
AO-2-72-4, FAP-72-95, NUDOCS 8305180704
Download: ML20084J738 (2)

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9 Commonwealth Edison Company Q U A D.C ITI E S NUCLEAR POWER ST ATION Address Reply to:

POST OFFICE ROX 216

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Actinc 71 rector, Directorate of Licensinc U. S. Atonic Energy Commission k' )/

Washington, D. C. 20545 s

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Dear Vr. Block:

4 4EP:' Quad-Cities Nuclear Power Station - Unit 2 DPo Apoendix A - Section 6.6.B.1

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The following reports the observation that lead to the discovery and removal of a heliarc welding outfit in a jet pumo riser for the Unit 2 reactor. This incident is reported as No. 2-72-4.

Des cription of Incident l

Jet pumps flow comparison checks were being performed on the " nit 2 reactor on April 23, 1972 as a final check prior to installation of the steam separator, steam

! dryer, and reactor ves'sel head. This test requires that both reactor recirculation pumos be running at the same speed with the recirculation header crosstie valves closed.

The indicated flow rates on each of the twenty (20) jet pumps are then checked and rhould be at approximately j the same value. The indicated flow rates on jet pumos (10) and (20) were about 50 per cent of the other 18 jet pumps. At 5:30 p.m. on April 28, 1972, the decision f bl was nade to remove jet pump (20) to determine the cause of the flow reduction. Jet pump No. 20 was removed at I p'O .

5: 00 o.m. on April 24, 1072 and the flow obstruction uns

$2 discovered. The obstruction was a heliarc weldinF outfit.

IGN gj The outfit consisted of:

IM a) One green rubber hose (5/8" O.D.), twenty-four

'M and on.e-half feet in len;-th , . . ...e a . . . .

q o p) fittings attached.

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- 8305180704 720508 gDRADOCK 05000265 PDR' copy SENT REGION . '

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b) One green rubber hose (5/8" 0.D. ), twelve *"

feet long - complete witn " Chicago" fitting e on one end and a copper fitting on.the other. _I_=_

C c) A two conductor welding cable, twenty-four and one-half feet long attached to a TIG

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welding gun. These conductors were covered =

with asbestos insulation which had been re- T paired with plastic tane.  ?

v 3e material described was fished out of the j et pumo 7_

riser using "J" hooks. The riser was inspected and 'the N IIo . 23 jet pump was reinstalled into the reactor vessel.

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Review of Peactor Cleanliness The quality control records for the installation, inspection, T and flushing of: Unit 2 jet pumps Numbers (19) and (20); #

recirculation header and reactor vessel were reviewed.

The jet pump riser had been properly installed, inspected, -1 and flushed. Flushing of all the emergency core cooling systems prior to primary systern hydrostatic test in May, Q

4 1971, and the residual heat removal system pump flow rate .:f tests performed in June,1971 provided good flushing of the recirculation piping system. A final inspection of i -

the reactor bottom head after the hydrostatic test and just prior to the installation of the core internals was "g)"

made on July 14, 1971.

Y The Quad-Cities Nuclear Power Station's - Station Review 4 ~

Board studied the quality control records, the flow test -

results, and the inspection that followed the jet pump d installation, and as a result of the investiFation the 4 reactor vessel and recirculation system was declared clean 3.c and clear of foreign material.

Approval was given to continue with the startuo test pro- -r grarn on v av 2, 1472 by the Station Feview Board.

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Very truly yours,

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CC'?"^"h'E ALTH EDIC^'! CC*T A::Y M E-Quad-Cities Nuclear Power Station

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! F. A. Palmer --d S uperin t.unden L p

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