LER-1998-001, Forwards LER 98-001-00 Re Containment Isolation Valve Leakage Which Exceeded Ts.Commitment Made by Util,Listed |
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| 2631998001R00 - NRC Website |
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Northern States Power Company Monticello Nuclear Generating Plant 2807 West Hwy 75 Monticello, Minnesota 55362-9637 April 22,1998 10 CFR Part 50 Section 50.73 US Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 MONTICELLO NUCLEAR GENERATING PLANT Docket No. 50-263 License No. DPR-22 LER 98-001 Containment isolation Valve Leakage Greater than Allowed by Technical Specifications The Licensee Event Report for this occurrence is attached. This report contains the following new NRC commitment:
Preventive maintenance procedures for valves similar to AO-2378 will be enhanced to aid in earlier identification of air-actuated 2-way switching valve malfunctions.
Please contact Tom Parker at (612) 295-1014 if you require further information.
hM44W Michael F Hammer Plant Manager Monticello Nuclear Generating Plant c:
Regional Administrator-ll1 NRC Sr Resident inspector, NRC NRR Project Manager, NRC State of Minnesots, Attn: Kris Sanda Attachment 9905010129 980422 DR ADOCK 050002 3
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| 05000263/LER-1998-001, Forwards LER 98-001-00 Re Containment Isolation Valve Leakage Which Exceeded Ts.Commitment Made by Util,Listed | Forwards LER 98-001-00 Re Containment Isolation Valve Leakage Which Exceeded Ts.Commitment Made by Util,Listed | | | 05000263/LER-1998-001-02, :on 980323,discovered Containment Isolation Valve Leakage Exceeded TS Limit.Caused by Foreign Matl Found on Valve Seat.Repaired Subject Valves & Developed Process to Ensure Cleanliness of Testing Equipment |
- on 980323,discovered Containment Isolation Valve Leakage Exceeded TS Limit.Caused by Foreign Matl Found on Valve Seat.Repaired Subject Valves & Developed Process to Ensure Cleanliness of Testing Equipment
| 10 CFR 50.73(a)(2)(i) | | 05000263/LER-1998-002-02, :on 980415,main Steam Isolation Valve Position Setpoint Outside Allowed Range,Was Found.Caused by Previous Testing Technique & Use of Particular Switch Model.Eight New Position Switches W/Less Deadband Installed |
- on 980415,main Steam Isolation Valve Position Setpoint Outside Allowed Range,Was Found.Caused by Previous Testing Technique & Use of Particular Switch Model.Eight New Position Switches W/Less Deadband Installed
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function
10 CFR 50.73(a)(2)(vii), Common Cause Inoperability
10 CFR 50.73(a)(2)(iv), System Actuation
10 CFR 50.73(a)(2)(i)
10 CFR 50.73(a)(2)(x)
10 CFR 50.73(a)(2)(iii)
10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition
10 CFR 50.73(a)(2)(viii)(A)
10 CFR 50.73(a)(2)(viii)(B) | | 05000263/LER-1998-003, Forwards LER 98-003-00 Re Transgranular Stress Corrosion Cracking Identified in Control Rod Drive Lines.Rept Contains Listed New NRC Commitments | Forwards LER 98-003-00 Re Transgranular Stress Corrosion Cracking Identified in Control Rod Drive Lines.Rept Contains Listed New NRC Commitments | | | 05000263/LER-1998-003-01, :on 980417,transgranular Stress Corrosion Cracking Was Identified in Control Rod Drive Lines.Caused by chloride-induced Transgranular stress-corrosion Cracking. Affected Sections of Two Lines Replaced |
- on 980417,transgranular Stress Corrosion Cracking Was Identified in Control Rod Drive Lines.Caused by chloride-induced Transgranular stress-corrosion Cracking. Affected Sections of Two Lines Replaced
| 10 CFR 50.73(a)(2)(iv), System Actuation
10 CFR 50.73(a)(2)(x)
10 CFR 50.72(b)(3)(ii), Degraded or Unanalyzed Condition
10 CFR 50.73(a)(2) | | 05000263/LER-1998-004, Forwards LER 98-004-00 Re Manual Scram Inserted Following Pressure Transient Closes Air Ejector Suction Isolation Valves & Trips Offgas Recombiners.Ler Contains Listed Commitment | Forwards LER 98-004-00 Re Manual Scram Inserted Following Pressure Transient Closes Air Ejector Suction Isolation Valves & Trips Offgas Recombiners.Ler Contains Listed Commitment | | | 05000263/LER-1998-004-02, :on 980909,manual Scram Was Inserted Following Pressure Transient Closed Air Ejector Suction Isolation Valves & Trips Offgas Recombiners,Occurred.Caused by Seat Leakage.Leaking Valve Seat Was Reworked |
- on 980909,manual Scram Was Inserted Following Pressure Transient Closed Air Ejector Suction Isolation Valves & Trips Offgas Recombiners,Occurred.Caused by Seat Leakage.Leaking Valve Seat Was Reworked
| 10 CFR 50.73(a)(2)(iv), System Actuation | | 05000263/LER-1998-005-01, :on 980921,HPCI Was Removed from Service to Repair Steam Leak in Drain Trap by Pass.Caused by Localized Erosion of Valve Body.Valve Was Declared Inoperable & Was Replaced with Manual Valve |
- on 980921,HPCI Was Removed from Service to Repair Steam Leak in Drain Trap by Pass.Caused by Localized Erosion of Valve Body.Valve Was Declared Inoperable & Was Replaced with Manual Valve
| 10 CFR 50.73(a)(2)(v), Loss of Safety Function | | 05000263/LER-1998-005, Forwards LER 98-005-00,re HPCI Being Removed from Service to Repair Steam Leak in Drain Trap Bypass.Commitments Made by Util Are Listed | Forwards LER 98-005-00,re HPCI Being Removed from Service to Repair Steam Leak in Drain Trap Bypass.Commitments Made by Util Are Listed | |
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