05000289/LER-1980-003-01, /01T-0:on 800206,during Valve Mods,Valve Seat hold-down Devices for HPI Pump Discharge Check Valves (MU-V73A/73C) Found Loose.Caused by Possible Corrosion.Insp Program Continuing & Design Study Is Being Developed

/01T-0:on 800206,during Valve Mods,Valve Seat hold-down Devices for HPI Pump Discharge Check Valves (MU-V73A/73C) Found Loose.Caused by Possible Corrosion.Insp Program Continuing & Design Study Is Being Developed

ML19294B136
Person / Time
Site:	Crane
Issue date:	02/20/1980
From:	Roxanne Summers GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19294B134	List: 05000289/LER-1980-003, Forwards LER 80-003/01T-0 05000289/LER-1980-003-01, /01T-0:on 800206,during Valve Mods,Valve Seat hold-down Devices for HPI Pump Discharge Check Valves (MU-V73A/73C) Found Loose.Caused by Possible Corrosion.Insp Program Continuing & Design Study Is Being Developed
References
LER-80-003-01T, LER-80-3-1T, NUDOCS 8002270269
Download: ML19294B136 (4)

LER-1980-003, /01T-0:on 800206,during Valve Mods,Valve Seat hold-down Devices for HPI Pump Discharge Check Valves (MU-V73A/73C) Found Loose.Caused by Possible Corrosion.Insp Program Continuing & Design Study Is Being Developed

Event date:
Report date:
2891980003R01 - NRC Website

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U.S. NUCLEAR REGULATORY CoMMtssioN MAC FORM 364 n.m LICENSEE EVENT REPORT e@

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4 60 41 GoCIE ET Nyug gm 68 69 tytNT 3ATg 74 7s REPORT CARE 80 EVENT DESCRIPTION AND PACSA8tE CONSECUENCES h oe2 i During valve modifications (per I. E. Circular 78-15) the valve seat hold-Aown I

p377)i evices for HPI pu=p discharge check valves CiU-V73A/73Cl were found to he loose. I d

oi4 [ The seats were found in their normal orientation indicatine that they would cer-1 o;3 form their back-flow prevention function althou2h vith no # 1a 'a,v,7 around I

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, the loose seat gaskets. Loose valve internals could potentia 11v block the valve I oi7 ; outlet reducing HPI pump flow. This is considered to be recortable -de-Ao I

o6e I requirements of Technical Soecification 6.9.2. A(9).

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i o lPreliminarv. evaluation of the cause is cessible corrosion of the seat hold-down I

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Subiect valves are 3" - 15004 - ch,--,n w ivo 147, e e Tiltine disc 1

check valves. A continuing inspection program and design study is being developed; Periodic

,to determine the scope of the problem and plan corrective actions.

l i pdates to the NRC will follow.

(See attachment for further details)

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February 20, 1980 LER 80-003/0lT-0 Cause Description and Corrective Actions (27)

Attached find a list of other Chapman tilting disc check valves in TMI Unit I.

Although the sizes vary, the design is identical for the seat hold-downs.

Parts from MU-V73C are undergoing laboratory analysis to determine the node of failure. Upon determination of the cause for the failure, corrective action will be taken. The valve vendor is assisting in evaluation and resolution of these problens as they are identified to him. Installation of stop pins per IE Circular 78-15 will continue with inspections and repairs.

TLL 075 TMI UNIT 1 TILTING DISC C11ECK VALVES TAG NUMBER B/Mll SERVICE POSITION SIZE MU-V-73A R0-77 MU rumps - Discharge Check Vertical 3"

MU-V-73B R0-77 MU Pumps - Discharge Check Vertical 3"

MU-V-7 3 C R0-77 MU Pumps - Discharge Check Vertical 3"

MU-V-79 R0-79 MU Pumps Fill Line Check Ilorizontal 2"

MU-V-86A R0-78 lligh Pressure Injection Check at Loop IIorizontal 2"

MU-V-86B R0-78 liigh Pressure Injection Check at Loop IIorizontal 2h" MU-V-94 R0-78 liigh Pressure Injection Isolation florizontal 2"

Loop A MU-V-95 R0-78 liigh Pressure Injection Isolation llorizontal 2"

Loop A MU-V-107A R0-78 IIPI Containment Isolation Checks llorizontal 2"

MU-V-107B RO-78 IIPI Containment Isolation Checks llorizontal 2"

MU-V-107C R0-78 IIPI Containment Isolation Checks lloritontal 2"

ItU-V-107D R0-78 IIPI Containment Isolation Checks llorizontal 2"

EF-V-11A R0-105 Cire. Water E.F.P. Discharge Vertical 4"

EF-V-11B RO-105 Cire. Water E.F.P. Discharge Vertical 4"

EF-V-12A R0-103 Emergency F. W. Pump Discharge at Ilorizontal 6"

Steam Generator

Page 2 TLL 075 TAG NUMBER B/M#

SERVICE POSITION SIZE EF-V-12B R0-103 Emergency F.W. Pump Discharge at llorizontal Steam Generator llorizontal 6"

EF-V-13 R0-103 EFPIA Discharge Vertical 6"

Dil-V-22A R0-75 D.11. Discharge Into Core Flooding Vertical 10" Lines Dil-V-22B R0-75 D. II. Discharge Into Core Flooding Ilorizontal 10" Lines FW-V-9A

• R0-71 Main Feed Pump Discharge llorizontal 20" W-V-9B

• R0-71 Main Feed Pump Discharge llorizontal 20" W-V-12A

• R0-72 Feed Water to Steam Generator llorizontal 20" W-V-12B

• R0-72 Feed Water to Steam Generator llorizontal 20"

• Drawings show stop pins were installed in valves when bought.