ML20052F783
| ML20052F783 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/05/1982 |
| From: | Youngblood B Office of Nuclear Reactor Regulation |
| To: | Tauber H DETROIT EDISON CO. |
| References | |
| NUDOCS 8205130628 | |
| Download: ML20052F783 (3) | |
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N DN RMattson Docket No.: 50-341 HThompson RVollmer p
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Detroit Edison Company TSpeis g,
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Dear Mr. Tauber:
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Subject:
Errors in BWR Water Level Indication on o
By memorandun dated February 9,1982, we transmitted to the Atomic Safety and Licensing Boards for six DWRs, including Ferni 2, the staff's evaluation to date of the subject matter. This evaluation was initiated to investigate errors in indicated water level at Pilgrim 1 during a routine reactor shut-down and depressurization with drywell air tenperature at 240"F. Large oscillations of the level instrument were attributed to flashing of water in the level instrument lines when reactor water pressure was decreased below saturation pressure at 240*F. High drywell tenperature may result fron faulty or inoperable drywell coolers and from high energy line leaks or breaks in the drywell. This evaluation was transmitted to you by copy of the February 9, 1982 transmittal to the ASLB.
Based on its evaluation, the staff has concluded that current energency operating procedure guidelines (NE00-24934, January 1981) are not adequate for operators to recognize and cope with unreliable reactor water level indications caused by water flashing in instrument lines under all potential abnomal operating and accident conditions. For exanple, the guidelines reconnend depressurization and refill of the reactor if vessel level cannot be detemined. However, the guidelines do not provide an adequate method for operators to recognize false high water level indications. Further, based on an audit of procedures for two operating plants, we find that even those portions of the guidelines which provide acceptable steps for cooing with water level errors have not been incor-porated into plant procedures.
The staff's recommendations for resolution of this problem are contained in its evaluation that was transmitted to you on February 9,1982. As a first step in the resolution, staff recommends the performance of plant specific analyses of the susceptibility of reactor vessel water level instrumentation to flashing.
The magnitude of the error due to flashing depends on the type of instrument (whether the reference leg is heated or cold) and changes of elevation of the instrument line inside the drywell. Accordingly, please amend your application to provide:
- 8205130628 820503 4
OFFIC PDR ADOCK 05000341
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d4 Mr. Harry Tauber MAY 5 1382.
(1) A description of the Ferni 2 reactor vessel water level instrumnts, including the types of instninents and instrurent line elevation changes inside the dry-well.
(2) The results of an analysis of the nagnitude and con-consequences of errors in water level indication for shutdown and depressurization following equipment failures that cause high drywell air tenperatures, e.g. af ter failure of drywell coolers, or high energy line breaks or leaks inside the drywell.
(3) A comitment to revise plant operating procedures within 90 days if the analysis of (2) above indicates it is needed to enable the operator to recognize excessive water level errors and to rnaintain adequate core cooling.
Our review schedule is based on the assumption that the above information will be available for our review by June 1,1982.
If you wish clarification of the requests or if you cannot meet these dates, please telephone the Licensing Project Manager, L. Kintner, within 7 days after receipt of this letter.
Sincerely,
'Originafs1Eea by:'
Spottswood Bursell
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B. J. Youngblood, Chief Licensing Branch No.1 Division of Licensing cc: See next page h0 I
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Mr. Harry Tauber Vice President Engineering & Construction Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 cc; Mr. Harry H. Voigt, Esq.
LeBoeuf, Lamb, Leiby & MacRae r-1333 New Hampshire Avenue, N. W.
Washington, D. C.
20036 Peter A. Marquardt, Esq.
Co-Counsel The Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 Mr. William J. Fahrner Project Manager - Fermi 2 The Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 Mr. Larry E. Schuerman Detroit Edison Company 3331 West. Big Beaver Road Troy, Michigan 48084 David E. Howell, Esq.
3239 Woodward Avenue Berkley, Michigan 48.072
'Mr. Bruce Little U. S. Nuclear Regulatory Commission Resident Inspector's Office 6450 W. Dixie Highway Newport, Michigan 48166 Dr. Wayne Jens l
Detroit Edison Company 2000 Second Avenue Detroit, Michigan 48226 Mr.. James G. Keppler l
Nuclear Regulatory Commission
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799 Roosevelt Road Glen Ellyn, Illinois 60137 i
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