ML20199A817
| ML20199A817 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 06/09/1986 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Wilgus W FLORIDA POWER CORP. |
| References | |
| GL-83-28, IEIN-85-058, IEIN-85-58, NUDOCS 8606160026 | |
| Download: ML20199A817 (2) | |
Text
I June 1986 OMd-0/ 6
'DATE CHANGED 1
June 9, 1986 Docket No. 50-302 Mr. Walter.S. Wilgus Vice President, Nuclear Operations Florida Power Corporation ATTN: Manager, Nuclear Licensing
& Fuel Management P. O. Box 14042; M.A.C. H-3 33733 St. Petersburg, Florida,
Dear Mr. Wilgus:
Generic Letter 83-28 regarding the Salem ATWS events required licensees to, among other things, submit a description of their preventive maintenance and surveillance program to ensure reliable reactor trip breaker operation.
Item 4.2.1 of that letter defined what should be included in that program, and Item 4.2.2 discussed trending of parameters. You responded to these items for Crystal River Unit 3 ('CR-3) in your letters of November 11, 1983, September 25,-
1985, and October 11, 1985.
Our contractor (INEL) has completed its review of your responses to these
' items and prepared input for a Safety Evaluation Report (SER). We have
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. reviewed this input and incorporated it into the enclosed SER.
The SER finds your responses on Items 4.2.1 and 4.2.2 of Generic Letter 83-28 to be acceptable, providing that you confirm that the UVT device roller rivet-armature clearance is measured with the UVT armature in the energized position, as recommended in IE Notice No. 85-58.
I.
Sincerely.
IMeew mee w John F. Stolz, Director PWR Project Directorate #6 Division of PWR I.icensing-B
Enclosure:
Safety Evaluation cc w/ enclosure:
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'g4 Mr. W. S. Wilgus Crystal River Unit No. 3 Fuclear Florida Power Corporation Generating Plant CC' Mr. R. W. Neiser
' State Planning and Development Senior Vice President Clearinghouse and General Counsel Office of Planning and Budget Florida Power Corporation Executive Office of the Governor P. O. Box 14042 The Capitol Building St. Petersburg, Florida. 33733 Tallahassee, Florida 32301 Mr. P. McKee Mr. F. Alex Griffin, Chairman Nuclear Plant Manager Board of County Commissioners Florida Power Corporation Citrus County P. O. Box 219 110 North Apopka Avenue Crystal River, Florida 32629 Inverness Florida 36250 Mr. Robert B. Borsum Babcock & Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Regulatory Commission Route #3, Box 717 Crystal River, Florida 32629 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Mr. Allan Schubert, Manager Public Health Physicist Department of Health and Rehabilitative Services 1323 Winewood Blvd.
Tallahassee, Florida 32301 Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road Tallahassee, Florida 32301 Attorney General Department of Legal Affairs The Capitol Tallahassee, Florida 32304
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SAFETY EVALUATION REPORT CRYSTAL RIVER UNIT 3 REACTOR TRIP SYSTEM RELIABILITY ITEMS 4.2.1 AND 4.2.2 0F GENERIC LETTER 83-28 1.
INTRODUCTION On July 8,1983, the Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 83-28. This letter addressed intermediate-term acti.ons to be taken by licensees and applicants aimed at essuring that a comprehensive program of preventive maintenance and surveillance testing is implemented for the reactor trip breakers (RTBs) in pressurized water reactors. "In particular, Item 4.2 of the letter required the licensees and applicants to submit a'descr.iption. of their preventive maintenance and surveillance program to ensure reliable reactor trip breaker operation.
.s The description of the submitted program was to include the following:
GL, Item 4.2.1 A planned program of periodic maintenance, including lubrication, housekeeping, and other items recommended by the equipment supplier.
GL, Item 4.2.2 Trending of* parameters affecting operation and measured during testing to forecast degradation of operation.
Florida Power Corporation, the licensee for Crystal River 3, submitted responses to the Gencric Letter on November 11, 1983, September 25, 1985, and October 11, 1985. This report presents an evaluation of the adecuacy of those responses and of the licensee's preventive maintenance and surveillance programs for RTBs.
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'iVALUATION CRITERIA 2.1 Periodic Maintenance Program The primary criteria for an acceptable periodic maintenance program are contained in Maintenance Instruction GEI-50299EI*, Power Circuit Breakers, Types AK-2/2A-15, AK-2/3/2A/3A-25, AKU-2/3/2A/3A-25," and Service Advice 175-9.35 and 175-9.20, by General Electric. The NRC Staff, Equipment Qualification Branch, has reviewed these items and endorsed the maintenance program they describe. The criteria include those items in the General Electric instructions and advisories that relate to the safety function of the breaker, supplemented by those measurements which must be taken to accumula,te data for trending. Those items identified for maintenance at six month intervals that should be included in the licensee's RTB maintenance proqFam.are:
1.
Verification of breaker cleanliness and insulation structure; all foreign materials, such as paint, dus't, or oil, should be removed to prevent electrical breakdown between points of different
. potential; 2.
Verification of breaker physical condition, including wiring insulation and termin'ation, all retaining rings, pole bases, arc quencher, stationary and movable contacts, and tightness of nuts and bolts; 3.
Verification of proper manual operation of the breaker, including checks for excessive friction, trip bar freedom, latch t.
engagement, operating mechanism alignment and freedom, and I
undervoltage trip (UVT) device armature freedom; 4
Verification of the optimum freedom of the armature; 5.
Verification of proper trio latch engagement as soecified in l
Service Advice 175-9.35, Item #52.
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Verification of undervoltage pick-up setting, as specified in Service Advice 175-9.35, Item #S3, and drocout voltage; 7.
Verification that the trip torque required on the trip shaft is less than 1.5 pound-inches, as specified in Service Advice 175-9.35, Item #54; "Before" and "After" maintenance torque values should be recorded; 8.
Verification of positive tripping by checking the adjustment between the UVT device and trip paddle as specified in Service Advice 175-9.35, Item #S5; 9.
Verification of proper trip response time as specified in Service Advice '175-9.35, Item E6; 10.
Shunt Trip Attachment (STA) operation verification;
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- 11. Examination and cleaning'of breaker enclosure;
- 12. Functional test of the breaker prior'to returning it to service.
1 2.2 Trending of Parameters Generic Letter Item 4.2.2 specifies that the licensbe's preventative maintenance and surveillance program is to include trending of parameters affecting operation and measured during testing to forecast degradation of operation. The parameters measured during the maintenance program described above which are applicable for trending are undervoltage trip attachment dropout voltage, trip torque, and breaker response time for undervoltage trip. The staff oosition is that the above three parameters in addition to the breaker insulation resistance are acceptable and recommended trendina carameters to forecast breaker ooeration degradation or failure.
If subsequent experience indicates that any of these parameters is not useful as a tool to anticipate f ailures or degradation, the licensee may, with justification and NRC approval, elect t'o remove that parameter from those to be tracked.
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EVALUATION 4
3.1 Evaluation of the Licensee Position on item 4.2.1 The licensee states that his preventative maintenance program for RTBs contains all the elements detailed in Section 2.1 of the SER. The licensee states that periodic maintenance is performed on an annual basis, with a' functional test performed monthly. The staff finds that the licensee's extended maintenance interval is acceptable. This acceptance is based on GE's recommendation that maintenance on RTBs located in mild environments should be performed annually. The vendor recommendation that RTBs located in harsh environments or experiencing severe load conditions be maintained more frequently is not applicable to these RTBs because of their location in a mild environment and reduced service duty at Crystal River (less than 200 RTB cycles annually).The staff finds the licensee position on Item 4.2.1 to be acceptable,'provided the licensee confirms that the UVT device j
roller-rivet clearance is measured with the UVT armature down in.the energized position,,as recommended in IE Notice No. 85-58.
3.2 Evaluation of the Licensee's Position on Item 4.2.2
'The licensee states that he will compile and submit to B&W trend data for RTB trip response time, trip shaft torque, and UVT device pickup and dropout voltage. The B&W Owners Grouo Reactor Trip Breaker Reliability Monitoring Program is attempting to identify the most effective parameters to forecast breaker degradation or f ailure. The staff finds the licensee position on Item 4.2.2 to be acceptable.
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CONCLUSIONS Based on a review of the licensee responses, the sta#f finds the licensee responses on Items 4.2.1 and 4.2.2 of Generic Letter 83-28 to be acceptable, provided that the licensee confirms that the UVT device roller rivet-armature clearance is measured with the UVT armature down in the energized position, as recommended in IE Notice No. 85-58.
I Principal contributor:
E. Rowney
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Dated: June 9, 1986 4
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