IR 05000251/1980036
| ML17340A828 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 02/06/1981 |
| From: | Brooks E, Quick D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML17340A827 | List: |
| References | |
| 50-251-80-36, NUDOCS 8103130217 | |
| Download: ML17340A828 (6) | |
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~j4 UNITED STATES NUCLEAR REGULATORY COMMISSION REGION I I 101 MARIETTAST., N.W., SUITE 3100 ATLANTA,GEORGIA 30303 Report No. 50-251/80-36 Licensee:
Florida Power and Light Company 9250 West Flagler Street Miami, FL 33101 Facility Name:
Turkey Point Docket No. 50-251 License no.
DPR-41 Inspection at Turkey Point site near Homestead, Florida
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Inspector:..
J.~ '
E.. Brooks Approved by:
D. Quick, ection Chief, ONS Branch
Dite igned at Signed SUMMARY Inspection on December 29-31, 1980 Areas Inspected This routine, announced inspection involved 20 inspector-hours on site in the areas of containment integrated leakage rate testing.
Results Of the areas inspected, no violations or deviations were identified.
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$ 3L08180 +$7
DETAILS Persons Contacted Licen see Empl oyees
"J.
K. Hayes, Plant Superintendent D. Haase, Technical Department Supervisor R. Gouldy, Plant Engineer B. Abrishami, Plant Engineer Other Organizations Stone and Webster B. C. Kuechler R. I. Parry NRC Resident Inspector A. Ignatonis W. Marsh
~Attended exit interview Exit Interview The inspection scope and findings were summarized on December 31, 1980 with those persons indicated in Paragraph 1 above.
Licensee Action on Previous Inspection Findings Not inspected.
Unresolved Items Unresolved items were not identified during this inspection.
Containment Integrated Leakage Rate Test (CILRT) Unit 4 The inspector reviewed the licensee's Containment Integrated Leakage Rate Test Procedure 13100.2 dated December 18, 1980.
The procedure includes the valve lineup and verification sheets, valve lineup schematics, and instru-mentation and control instrument list.
The inspector observed the pressurization phase of the CILRT, inspected the installation of compressors, and reviewed the valve lineup verification data sheets.
Containment pressurization was initiated at 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on 12/30/80.
.Pressurization was stopped at approximately 25 psig to survey containment for leaks.
Minor leaks were identified at vents or drains at penetrations 7, 47, 9, 10, 52, 64A and 64B.
No attempts were made to adjust valves or
I
-2-isolate the leaks.
Pressurization was then continued until 2105 hours0.0244 days <br />0.585 hours <br />0.00348 weeks <br />8.009525e-4 months <br /> on 12/30/80 at which time containment pressure reached 68.7 psia and the com-pressors were secured and vented.
The containment was allowed to stabilize until 0140 hours0.00162 days <br />0.0389 hours <br />2.314815e-4 weeks <br />5.327e-5 months <br /> on 12/31/80.
At this point the change in containment average temperature did not exceed 0.5 degrees F per hour over a
two hour period.
Leakage rate testing (data collection) started at 0520 hours0.00602 days <br />0.144 hours <br />8.597884e-4 weeks <br />1.9786e-4 months <br /> on 12/31/80.
Using the absolute test method mass point analysis, calculated leakage decreased from
~ 166299 to 0. 102597 weight percent per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> over a
hour period.
The leakage rate acceptance limit for Turkey Point unit 4 is 0.1875 (.75La).
At 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br /> on 12/31/80 a
leak occured causing the calculated leakage rate to increase to above the acceptance limit:
A survey team was dispatched to search for the cause of the increased leakage.
Automatic valve CV-4668A at penetration 52 was discovered to be leaking via the valve bonnet.
The valve was in the open position as required and verified on the valve lineup sheets.
However, the correct valve position was indicated as closed on the valve lineup s'chematics.
The licensee concluded that leakage occured due to fai lure of the diaphragm seal which was inadvertantly exposed to the containment pressure with the valve in the open position.
During a
LOCA this valve would be closed automatically to act as the containment boundary thereby isolating the diaphragm seal from containment pressure.
Considering that the leak occured under conservative circumstances the licensee considered it acceptable to close the valve by automatic actuation.
Data collection was again started at 1900 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.2295e-4 months <br /> on 12/31/80, continued for
hours and included the controlled leakage verification test.
The containment was brought to atmospheric pressure on 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> on 1/2/81.
Calculated leakage at the end of the testing period was 0.030 weight percent per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> as compared to the acceptance limit of 0. 1875 weight percent per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
A CILRT summary technical report will be submitted to the Commssion in approximately 3 months.