ML20084J425
| ML20084J425 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/30/1972 |
| From: | Palmer F COMMONWEALTH EDISON CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084J407 | List: |
| References | |
| FAP-72-166, NUDOCS 8305120606 | |
| Download: ML20084J425 (2) | |
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Commonwealth Edison Company Q U A D-C ITIE S NUCLEAR POWE R ST ATIO N Address Reply for c
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- CoRDoVA, ILtlNol$ 61242 FAP-72-166 Au gu s t 30, 1972
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.4 Mr. Angelo Giambusso, Deputy Director
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Dear Mr. Giambusso:
NE REF:
Quad Cities Nuclear Power Station l-Unit 2 - DPR-30 Appendix A l
Sections 1.0.A.2, 3.6.G, 6.6.A.3, and 6.6.B.3 The purpose of this letter is to inform you of the details regarding the jet pump failure at Quad Cities Unit 2.
This incident occurred on August 20, 1972 at 11:00 p.m.
D_ESCRIPTIO_N_ _0_F_ INCI_ DEUT With Unit 2 at Quad Cities Station operating at 60% thermal power, a recirculation loop flow unbalance approaching 15%
was detected.
Further investigation revealed abnormal flow indication on Jet Pump #17 I_MMEDI_AT_E _ A_CTIONS_
Jet Pump #17 was-declared inoperable and an orderly shut-down of Unit 2 reactor was started at.12:15 a.m.
on August 21, 6
1972.
All rods were inserted by 5: 10 a.m.
INVESTIGATION When Unit 2 reactor vessel head was removed, it was dis-covered that Jet Puc:p #17 ha.d been displaced from its K-normal voastion and vs= leaninc on 3et rump #16-3et Pump #17 was removed from Unit 2. reactor on-August 27,
/1972 and was tec:porarily stored in the fuel storage ' p001~.-
N f.(Visualinspectionrevealedthatsevenparts M:j h
of the jet M
pump were missing; h
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Beam Bolt 2.
Beam. Bolt Keeper 3
' Beam Bolt Retainer 4.
Beam Bolt Retainer Screv 5
Beam Bolt Disc '
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Beam Bolt Lock with Four Flat Head Screvo 7.-
Retainer Bolt Keeper All the'missin6 pieces have been l'ocated in the reactor annulun area'except for the beam bolt disc.
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' Investigation indiented no damage on the riser posto and seat,'the restrainer gate mount, and the slip-joint seat of the diffuser.
Prior to startup, the i nv es ti ga ti on of the cause of failure vill be completed and all jet pumpo vill be inspected.
When the_analycin'and-inspections are complete, a' report will be submitted to the Atomic. Energy Commission.
Reapeetfu11y,
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F.A.
Palmer Superintendent-FAP:LFG/ill cc:
L.D.
Butterfield
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