ML20236T644
| ML20236T644 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 11/25/1987 |
| From: | Wagner D Office of Nuclear Reactor Regulation |
| To: | Fay C WISCONSIN ELECTRIC POWER CO. |
| References | |
| NUDOCS 8712010424 | |
| Download: ML20236T644 (3) | |
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.1 iNovember.25, 1987 Docket No. 50-301 DISTRIBUTION:
sUocKet!nies g DWagner.
NRC PDR OGC-Bethesda Local POR EJordan PDIII-3 r/f-JPartlow Mr. C. W. Fay, Vice President KPerkins
-ACRS(10)
Nuclear Power Department.
GHolahan
'PDIII-3 Gray File.
Wisconsin Electric Power Company PKreutzer 231'W. Michigan Street, Room 308 Milwaukee, Wisconsin 53201
Dear Mr. Fay:
SUBJECT:
POINT BEACH 2 - SUSCEPTIBILITY TO HIGH CYCLE FATIGUE FAILURE 0F STEAM GENERATOR. TUBE 5 We have reviewed your letter dated November 20, 1987 which documents the details of the enhanced primary-to-secondary leakage' monitoring program at Point Beach 2.
You developed this leakage monitoring' program in response to the North Anna tube rupture which occurred this summer.-
We conclude that the program, as ' detailed in your letter is acceptable because it permits prompt identification of.a possible tube failure with leakage characteristics similar tc that which occurred at North Anna. This conclusion is based upon:
1.
Establishment of radioactivity alert alarm levels slightly above steady-state leak rates.
2.
Trending and review of radioactivity concentrations from the unit specific air ejector monitor, the combined air ejector monitor, and the unit specific steam generator blowdown monitor each 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> shift.
3.
Calculation of primary-to-secondary leak rate on a daily basis.-
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Evaluation of leak rate ever 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> if primary-to-secondary leakage exceeds 40 gallons per day (gpd) and is unstable, 'or if the leak rate l
exceeds 15 gpd and continues to increase.
5.
Evaluation of the need to reduce power or shut down if the leak rate i
exceeds 100 gpd.
6.
Compensatory measures in place if the unit specific air ejector monitor is out of service.
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7.
Initiation of operator training on both the North Anna tube failure l
and the basis for the enhanced primary-to-secondary leakage monitoring program.
W We $$h' S
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2 In the near future, we plan to issue an NRC Bulletin informing other licensees of the high cycle fatigue issue and the possible need for an enhanced primary-to-secondary leakage monitoring program. The NRC Bulletin will require plants with stability ratios between 0.80 and 0.90, such as Point Beach 2, to institute an enhanced primary-to-secondary leakage monitoring program until stability ratios are demonstrated to be less than 0.80.
We remind you that although you-i have detailed your enhanced leakage monitoring program to us already, you will i
l be required to demonstrate how you have addressed the items contained in the Bulletin.
Sincerely,
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Original Signed By:
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David H. Wagner, Project Manager Project Directorate III-3 l
Division of Reactor Projects I
cc: See next page J
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Office:
LA/PDIII-3 FM/PDIII-3 PD/P 3
Sarname: PKreutzer DWagner/tg KPerki e Date:
11/,(/87 11/pp87 11g/87 l
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i Mr. C. W. Fay Point Beach Nuclear Plant' Wisconsin Electric Power Company Units 1 and 2 i
cc:
-I Mr. Bruce Churchill, Esq.
Shaw, Pittman, Potts and Trowbridge 2300 N' Street,~N.W.
Washington, DC 20037 i
Mr. James J. Zach, Manager j
Pcint Beach Nuclear Plant Wisconsin Electric Power Company 1
6610 Nuclear. Road j
Two Rivers, Wisconsin 54241 l
Toven Chaiman Town of Two Creeks Route 3 Two Rivers, Wisconsin 54241 Chaiman Public Service Connission of Wisconsin l
Hills Fams State Office Building Madison, Wisconsin 53732 Regional Administrator, Region III U.S. Nuclear Regulatory Commission i
Office of Executive Director 1
for Operations i
799 Roosevelt Road i
Glen Ellyn, Illinois 60137 Resident Inspector's Office' U.S. Nuclear Regulatory Consnission 6612 Nuclear Road Two Rivers, Wisconsin 54241 l
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