ML20128M554
| ML20128M554 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/31/1985 |
| From: | Denton R BALTIMORE GAS & ELECTRIC CO. |
| To: | Jaffe D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8506030009 | |
| Download: ML20128M554 (9) | |
Text
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BALTIMORE G AS AND ELECTRIC COMPANY P.O. BO X 14 7 5 B A LTIM OR E". M A R YL A N D 212o3 NUCLEAR P0wtR DEPARTMENT -
COLVERT CLIFFS NUCLEAR POWER PLANT LUSBY, M ARYLAND 20657 May 31,1985 U.S. Nuclear Regulatory Commission Division of Licensing Washington, DC 20555 ATTENTION: Mr. David H. Jaffe, Project Manager Operating Reactors Branch #3
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 In:ervice Inspection Program
REFERENCE:
(1)
BG&E Letter from A. E. Lundvall, Jr., to 3. R. Miller, dated February 4,1985, Inservice Inspection Program Request for Relief from ASME Code Section XI Gentlemen:
Reference (1) letter referenced requested relief from performing certain examination requirements on the Reactor Coolant Pump (RCP) casings.
Additional information concerning the RCPs at Calvert Cliffs is provided herein.
Each RCP has vibration monitoring instrumentation with a key phaser circuit for quantitative vibration analysis. Both X and Y plane vibration is displayed in the Control Room on a single monitor for each pump. Both audible and visual alarm annunciation is provided to warn Operators of high vibration conditions.
Reactor coolant flow is monitored and displayed in the Control Room. Should flow degrade to 97% of design the Reactor Protective System will annunciate pre-trip conditions. Further reduction of flow to 95% of design will result in automatic tripping of the reactor.
The Reactor Coolant System is monitored for impact due to loose parts or foreign objects. Eight piezo-electro accelerometers are mounted throughout the system. The loose parts monitor recorder is located in the Control Room and alarm annunciation occurs at predetermined impact values.
Reactor Coolant Pump motor current is indicated in the Control Room. The RCP motor also has a high vibration alarm annunicator.
8506030009 850531
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Enclosed please find several fabrication radiographic standard shooting sketches showing the casting-to-casting weld locations in a pump case.
Also enclosed is drawing
. 6750-M-545-1 showing dimensions of the pump and motor assembly.
We have considered the performance of a surface examination on the RCP case outer weld surface to reassess pump intergrity. We have concluded that a liquid penetrant exam of the outer weld surface would not answer the sensitivities or provide beneficial knowledge to further assurance of pump integrity.
To perform a liquid penetrant examination of the outer casing weld of one RCP lt is estimated that 290 manhours and three manrem would be required. This estimate includes scaffolding, insulation removal and replacement, and the examination manhours and exposure.
Should you have further questions regarding this matter, please do not hesitate to contact us.
Very truly yours, C
. E. Denton General Supervisor -
Training & Technical Services RED /BCR/gla Enclosures cc: D. A. Brune, Esquire (w/o Enclosures)
G. F. Trowbridge, Esquire T. Foley
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