ML18058B020
| ML18058B020 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 08/24/1992 |
| From: | Slade G CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-92 NUDOCS 9208280318 | |
| Download: ML18058B020 (5) | |
Text
consumers Power POWERINli MICHlliAN'S PROliRESS Palisades Nuclear Plant:
27780 Blue Star Memorial Highway, Covert, Ml 49043 August 24, 1992 Nuclear Regulatory Commission Document Control D.esk Washington, DC 20555 GB Slade General Manager DOCKET 50-255 - LICENSE DPR PALISADES PLANT - FARRIS SAFETY RELIEF VALVE MODEL NUMBER 2745 PKD/S4 - 10CFR21 On July 21, 1992, the investigation of the premature lifting of RV-3128, Safety Injection Tank T-828 relief valve, determined the problem to be related to the manufacture of the valve.
The premature lifting of this relief valve on May 13, 1992, lowered the safety injection tank nitrogen overpressure below the required technical specification limit and placed the plant in a one hour technical specification action statement. Subsequent plant operation continued with heightened operator attention. A second premature lift occurred on July 1, 1992 after a plant trip.
Subsequent removal and testing of the valve determined the problem to be misalignment of the spring adjustment screw bore in the bonnet of the valve.
This misalignment created inconsistent relief valve setpoints and reset values.
The bonnet and spring were replaced and reproducible relief valve setpoints and reset values were obtained.
Palisades has not experienced prior problems of this nature, though we have had 23 similar valves installed and in service for more than 20 years.
The enclosed 10CFR21 report is being submitted in conformance with the requirements of 10CFR21.21(3)(ii). The same information was sent by facsimile to the NRC Operations Center on July 30, 1992.
&/flALL----
Gerald B. Slade Plant Manager CC Administrator, Region III, USNRC NRC Resident Inspector - Palisades Attachment 9208280318 '920824.
PDR ADOCK,05000255 S
P*DR A CMS ENERGY COMPANY
l..
Consumers Power Company Palisades Plant Docket 50-255 10CFR21 REPORT FARRIS SAFETY RELIEF VALVE MODEL NO. 2745 PKD/S4 August 24, 1992 3 Pages
10CFR21 REPORT
- 1.
Name and address of individual informing the NRC.
P. M. Donnelly, Director of Plant Safety and Licensing Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, Mi 49043
- 2.
The basic compone~t which contains defects.
Farris safety relief valve model number 2745pkd/s4
- 3.
The firm supplying the basic component which contained a defect.
Teledyne Farris Engineering 400 Commercial Avenue Palisades Park, New Jersey 4a. Nature of the defect.
Mr. Kevin Karras QC Manager 201-944-6300 The bore for the spring adjustment screw in the valve bonnet was out of eccentricity by.020 11 which caused setpoint drift and inadvertent opening of the relief valve.
4b. The safety hazard which could be created by such a defect.
The relief valve lifting lowered the $afety injection tank nitrogen overpressure below the technical specification limit.
5._ The date when information of the-defect was obtained.
)
July 21, 1992
- 6.
The number and location of all such components subject to this Part 21 Palisades has 23 of these model valves in safety and nonsafety related applications in the plant (Ordered per original Bechtel requisition 5935-M-235).
4 - Safety injection tank relief valves 1 - Boric acid batch tank outlet valve 2 - Concentrated boric acid tank outlet valves 2 - Concentrated boric acid tank recirculation valves 2 - Boric acid filter inlet/outlet valves 2 - Boric acid pump recirculation valves 1 - Boric acid makeup inlet valve 1
Boric acid blender inlet valve 1
Volume control tank discharge valve 3 - Charging pump suction relief valves 1 - Redundant high pressure injection relief valve 1 - High pressure safety injection relief valve 2 - High pressure safety injection pump discharge relief valve 1
10CFR21 REPORT 7a. The corrective action planned or taken.
The valve bonnet and sprin~ have been replaced on the subject valve.
No further generic correct1ve action is planned, see #8 below.
7b. The name of the individual responsible for the corrective action.
R.B. Kasper le. The length of time required to complete the corrective action.
Action is completed.
- 8.
Any advice related to the defect that has been, is being, or will be given from the supplier.
We believe this is an isolated occurrence.
We have queried the industry experience database and have not found any similarly reported problems.
This is the first occurrence that Palisades has had with this problem and it should be noted this valve operated in the plant for 20 years without prior problems.
2
RV-312.IDENTIFIED DEFICIENCY
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Compression Nut.020 Compression screw Bonnet Bore not true resulting in compression nut angularity
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out from perpendicular with valve stem/seat.
FARRIS 2745-PKD SERIES SAFETY RELIEF VALVE Order No. 5938M235AC Drwg. No. 12667-F-SP-l