ML19345D031
| ML19345D031 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 11/17/1980 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8012080804 | |
| Download: ML19345D031 (3) | |
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NUCLEAR REGULATORY CONMISSION t
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w to Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas and Electric Company P. O. Box 960 Cincinnati, Ohio 45201
Dear Mr. Borgmann:
SUBJECT:
INSERVICE INSPECTION OF PRESSURE ISOLATION VALVES (Wm. H. Z1mmer Nuclear Power Plant, Unit No. 2)
As a result of our review of your application regarcing inservice inspection i
af pressure isolation valves, we require the following infomation:
Provide a list of pressure isolation valves included in your testing program with four (4) sets of piping and instrumen-tation diagrams which clearly show the reactor coolant system isolation valves. Also, discuss in detail how your leak test-ing program conforms to the staff position (see enclosure).
It is requested that this information be provided within 15 days of receipt of this 'etter. This position has previously been provided to your staff.
Sincerely,
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Robert L. Tedesco, Assist nt Director for Licensing Division of Licensing
Enclosure:
Staff Position -
Inservice Inspection of Pressure Isolation Valves, September 22, 1980 so1aosoPe1 g
Mr. Earl A. Borgmann Vice President - Engineering Cincinnati Gas & Electric Company P. O. Box 960 Cincinnati, Ohio 45201 cc: Troy B. Corner, Jr., Esq.
Leah S. Kosik, Esq.
Conner, Moore & Corder 3454 Cornell Place 1747 Pennsylvania Avenue, N.W.
Cincinnati, Ohio 45220 Washingtor., D.C.
20006 W. Peter Heile, Esq.
Mr. William J. Moran Assistant City Solicitor General Counsel Room 214, City Hall Cincinnati Gas & Electric Company Cincinnati, Ohio 45220 P. O. Box 960 Cincinnati, Ohio 45201 John D. Woliver, Esq.
Clermont County Comunity Council Mr. William G. Porter, Jr.
Box 181 Porter, Stanley, Arthur Batavia. Ohio 45103 and Platt 37 West Broad Street Mrs. Mary Reder Columbus, Ohio 43215 Box 270, Rt. 2 California, Kentucky 41007 Mr. James D. Flynn, Manager Licensing Environmental Affairs Andrew B. Dennison, Esq.
Cincinnati Gas & Electric Company 200 Main Street P. O. Box 960 Batavia, Ohio 45103 Cincinnati, Ohio 45201 Robert A. Jones, Esq.
David Martin, Esq.
Prosecuting Attorney of Clemont Office of the Attorney General County, Ohio 209 St. Clair Street 154 Main Street First Floor Batavia, Ohio 45103 Frankfort, Kentucky 40601 Resident Inspector /Zimer Dr. Frank F. Hooper U.S. Nuclear Regulatory Commission School of Natural Resources P. O. Box 58 University of Michigan New Richmond, Ohio 45157 Ann Arbor, Michigan 48109 Charles Bechhoefer, Esq., Chairman Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Comission Washington, D.C.
20555 Mr. Glenn 0. Bright Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Comission Washington, D.C.
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210.0 MECHANICAL EflGINEERING BRANCH There are several safety systems connected to the reactor coolant pressure o
boundary that have design pressure below the rated reactor coolant system (RCS) pressure. There are also some systems which are rated at full reactor pressure on the discharge side of pumps but have pump suction below RCS pressure.
In order to protect these systems from RCS pressure, two or more isolation valves are placed in series to form the interface between the high pressure RCS and the low pressure systems. The leak tight integrit, of these valves must be ensured by periodic leak testing to prevent exceeding the design pressure of the low pressure systems thus causing an inter-system LOCA.
Pressure isolation valves are required to be category A or AC per IWV-2000 and to meet the appropriate requirements of IWV-3420 of Section XI of the ASME Code except as discussed below.
Limiting Conditions for Operation (LCO) are requred to be added to the technical specifications which will require corrective action f.e., shutdown or system isolation when the final approved leakage limits are not met. Also surveillance requirements, which will state the acceptable leak rate testing frequency, shall be provided in the technical specifications.
Periodic leak testing of each pressure isolation valve is required to be performed at least once per each refueling outage, after valve maintenance prior to return to service, and for systems rated at less than 50% of RCS design pressure each time the valve has moved from its fully closed position unless justification is given. TM testing interval should average to be approximately one year. Leak testing snould also be performed after all disturbances to the valves are complete, prior to reaching power operation following a ret 111ng outage, maintenance and etc.
The staff's present position on leak rate limiting conditions for operation must be equal to or less than 1 gallon per minute for each valve (CPM) +3 ensure the integrity of the valve, demonstrate the adequacy of the redundant peessure isolation function and give an indication of valve degradation over a finite period of time. Significant increases over this limiting valve would be an indication of valve degradation from one test to another.
Leak rates higher than 1 GPM will be considered if the leak rite changes are below 1 GPM above the previous test leak rate or system design precludes measuring 1 GPM with sufficient accuracy. These items will be reviewed on a case by case t
r basis.
The Class 1 to Class 2 boundary will be considered the isolation point which must be protected by redundant isolation valves.
In cases where pressure isolation is provided by two valves, both will be inde-
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pendently leak tested. When three or more valves provide isolation, only two of the valves need to be leak tested.
Provide a list of all pressure isolat'on valves included in your testing p agram along with four sets of Pit ng and Instrument Diagrams which describe your reactor
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coolant system pressure isolation valves. Also discuss in detail how~ your -leak testing program will conform to the above staff position.
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