ML20033B374
| ML20033B374 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 11/23/1981 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Tedesco R Office of Nuclear Reactor Regulation |
| References | |
| REF-SSINS-6820 EF2-55-147, IEB-79-15, NUDOCS 8112010333 | |
| Download: ML20033B374 (4) | |
Text
,
Harry Tcuber
$r YCo-wuctw Dehoit Edison !ERE==
November 23, 1981 EF2 - 55,147 Mr. Robert L. Tedesco a
Assistant Director for Licens,ing Division of Licensing I
Office of Nuclear Reactor Regulation Op Q
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8 U. S. Ftelear Regulatory Commission 0
Washi:. con, D. C. 20555 4,
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Dear Mr. Tedesco:
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Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
IE Bulletin 79-15, Long Term Operability of Deep Draft Pumps This is in response to your letter dated-August 24, 1981.
The IE Bulletin 79-15 guidelines stress proper installation and assembly, monitoring of pump perfor-mance during operation, and disassembly of the pumps to inspect and measure certain components. The present Fermi 2 approach addresses the same objective as IE Bulletin 79-15 in assuring long term operability of the deep draft pumps cited.
This approach emphasizes proper manufacture, installa-tion, assembly, testing, and long term surveillance.
Subsequent disassemblies of the pumps following initial startup are not considered necessary nor presently planned because measurements of pump performance and bearing vibration during the intial test period and subsequent in-service tests would provide ample indica-tion of incipient pump problems.
If such indications occur, further testing and disassembly would be done to the degree necessary to resolve the problem.
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Mr. Robert L. Tedesco November 23, 1981 EF2 - 55,147 Page 2 The long-term operability of deep draft pumps is being assured by virtue of a five phase process.
These pha-ses are:
e Quality verification of the pump and motor assembly during manufacture, o Construction verification of the foundation and
- sump, e Veri fication of proper installation and align-ment of the pump asssembly.
e Startup testing sufficient to verify pump capa-bility and condition for long term operability.
e In-service surveillance testing asing sophisti-cated vibration measuring techniques to deter-mine any degradation of internal components.
Edison's source inspectors visited the manufacturer's plant during the manufacturing of the pumps.
Obser-vance of the pumps at predetermined witness and hold points during manufacturing and factory testing assured compliance with specified quality requirements.
When the pumps were received at the plant site, they were inspected for potential damage during shipment.
The accompanying quality assurance documentation was reviewed for compliance with specifications.
The pumps were installed in accordance with approved instructions, and proper installation was verified by contractor QC personnel.
Startup testing will be performed to verify the capa-city of the pumps at the systems' design points.
This testing consists of the following:
1.
The pump and motor coupling will be initially aligned within acceptable limits.
2.
The motor will be electrically tested and its rota-tion checked.
3 Vibration data will be taken while the pump is running during the initial testing.
Mr. Robert L. Tedesco November 23, 1981 EF2 - 55,147 Page 3 4.
The pump and motor coupling will be final aligned within the manufacturer's specified limits.
5 The pump capacity and capabilities at the various system design points will be verified by test.
Should excessive vibration, motor hot spots, or any other symptom of trouble be detected during this proce-dure, additional testing and evaluation will be per-formed.
The pump will not be released for service until it has successfully completed the startup eva-luations.
Pump manufacturer's field service personnel will be utilitized as needed to resolve problems iden-tified during startup.
In-service surveillance testing will take two forms:
operational monitoring and diagnostic testing.
Operational monitoring will be performed by the operating instrumentation installed locally or in the control room.
Thrust bearing temperature, on-off-auto control switches, and pump running status are all operationally monitored.
Because all of the pump abnormalities listed in IE 3ulletin 79-15 exhibit vibration as a symptom, the operational monitoring instrumentation would detect the presence of a problem. Manufacturer's specifications and accepted industry standards will be used as criteria for acceptable operation.
Surveillance testing will be performed quarterly.
It will consist of the following:
1.
Determination of the total head developed by the pump.
2.
Measuring the flow from the pump.
3 Measuring vibration of the pump-motor assembly using readings in velocity units.
Such a method is accepted throughout the industry as being more sen-sitive to detecting incipient bearing problems than peak-to-peak vibration amplitude measurement techniques.
Mr. Robert L. Tedesco November 23, 1981 EF2 - 55,147 Page 4 These tests are aimed at providing the earliest possible detection of pump problems which exhibit the following symptoms:
1.
Degradation of capacity or developed head.
2.
Excessive vibration.
3 Excessive thrust bearing temperature.
Detroit Edison is con'I.nced that the program described above will determine i.e need to dismantle and inspect the bearings and other pump parts of a given unit. The bearing wear criteria used to evaluate the pump bearings, when a pump is disassembled, will be those specified by the pump manufacturer (Goulds).
Sincerely, cc:
L. L. Kintner B. Little
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