IR 05000409/1978014
| ML19274C912 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 11/28/1978 |
| From: | Reyes L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19274C911 | List: |
| References | |
| 50-409-78-14, NUDOCS 7901050333 | |
| Download: ML19274C912 (7) | |
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U. S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
Report No. 50-409/78-14 Docket No. 50-409 License No. D?R-45 Licensee:
Dairyland Power Cooperative 2615 East Avenue, South La Crosse, W1 Facility Name: LACBWR Inspection At: LACBWR Site, Genoa, WI Inspection Conducted Ocobpr27-30andNovember 3-5, 1978 i
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Inspector:
Luis A. R s
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U/2 f/ 75 Approved By:
J.' F. Streeter, Chief Nuclear Support Section 1 Inspection Summary Inspection on October 27-30 and November 3-5, 1978 (Report No. 50-409/78-14)
Areas Inspected: Routine, announced inspection of the containment leak rate test.
The inspection included 53 inspector-hours onsite by one NRC inspector.
Results: No items of noncompliance or deviations were identified.
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DETAILS
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1.
Persons Contacte,d
- R. Shimshak, Plant Superintendent
- J. Parkyn, Assistant Plant Superintendent
- H. Towsley, QA Supervisor
- G. Boyd, Operations Supervisor
- P. Wiley, Training and Relief Supervisor
- L. Papwor?h, Operations Engineer
- F. Ducheshean, NES, Engineer The inspector also contacted several other licensee employees, including
'i members of the technical and engineering staffs, reactor and auxiliary operators, and clerical personnel.
- Denotes those attending the exit interview.
2.
1978 Containment Integrated Leak Rate Test (CILRT)
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a.
First Test A CILRT was attempted during the period October 28 to October 30, 1978, but had to be aborted to correct excessive leakage. During the first test, the licensee measured the leakage rate through the exhaust vent dampers to be approximately
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0.099 w%/ day and total leakage rate for the containment of approximately 0.2 w%/ day. This test was considered a failure.
The containment was depressurized on October 30 to repair the exhaust vent damper system and ten electrical penetrations.
At that time a design change was performed on the exhaust vent dampers to improve their leak tightness by reversing the position of the butterfly valves.
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b.
Second Test Following completion of repairs to the exhaust vent dampers and the electrical penetrations, the containment was repressurized to 52 psig on November 3, 1978.
The inspector independently evaluated leak rate data to verify the licensee's calculations of the leak rate. There was acceptable agreement between the inspector's and licensee's leak rate calculations as indicated in the following summary of leak rates in w%/ day.
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24 Hour Test Supplemental Test
Licensee 0.0635 0.1169 Inspector 0.0611 1 0.0053 0.1204 No items of noncompliance or deviations were identified.
3.
Error Analysis The licensee performed an instrument error analysis using the method suggested in the ANS N274, k'ork Group 56-8, document entitled " Reactor Containment Leakage Testing Requirements," Draft No. 1, dated April 22, 1975. The results indicated an error of i 0.00675 w%/dsy.
No items of noncompliance or deviations were identified.
4.
Instrumentation The following instrumentation vas used during the test:
a.
Temperature Twelve Foxboro dynatherm resistance bulbs with a range of 65F to 95F, an accuracy of 1 0.50F, and a reproducibility of i 0.010F were installed througout the containment adjacent to all but two reference chambers (No. 13 and No. 14).
Readout equipment was an Esterline-Angus multipoint recorder with a range of 65-950F, an accuracy of 1 0.5% and a sensitivity of i 0.05%.
Calibration of the system confirmed the readings to be within 10F of a thermometer which had a calibration traceable to NBS. A weighting factor was applied to each temperature sensor reading in order to obtain the containment weighted average temperature.
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b.
Relative Humidity Twelve Honeywell temperature compensated humidity sensors with a range of 5-95% R.H., an accuracy of i 2%, and a reproducibility
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of 0.1% R.H. were installed throughout the containment adjacent to all but two reference chambers (No. 13 and No. 14). The Honeywell signal converters for the temperature humidity sensors had an accuracy of i i to 2%.
Readout equipment was similar to that used for the temperature sensors.
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Calibration of the humidity sensors was accomplished by
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determining the relative humidity in the vicinity of each sensor with a motorized psychrometer and then adjusting the output of each sensor to agree with the psychrometer with an accuracy of 2%
traceable to NBS. A weighting factor was applied to each sensor in order to obtain the containment weighted average relative humidity, c.
Pressure Containment pressure was measured by a Wallace and Tiernan digital pressure indicator with a range of 0-60 psi, an accuracy of 0.05% and a repeatability of 0.02% of full range. Calibration against a dead weight tescer, traceable to NBS, was determined to be within 0.05% of full scale. Absolute containment pressure was obtained by adding the barometric pressure to the containment pressure. Barometric Pressure is measured with a Manning Marcell and Moore barometer with an accuracy and repeatability of 0.01" Hg. Calibration of the unit against the U. S. Weather Bureau instrument at La Crosse Airport verified its accuracy.
Differential pressure between the containment and the reference system was measured by a Validyne differential pressure indicator. The D/P cell had a range of 0-10 mm Hg., a linearity of i 1/2% full scale and a repeatability of 1 1%.
The digital readout unit had an accuracy of.01% full scale and a repeatability of 1 1%.
Calibration of the unit throughout its range showed a linearity of approximately 1% of scale.
d.
Flow The superimposed leakage and individual penetration leakage rates were measured with a Precision Scientific wet test meter having a range of 5 to 60 ft.3/hr and an accuracy of i 1/2%. The
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last calibration of the meter was more than 6 months prior to the first CILRT attempt on October 28.
The inspector informed the
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licensee that the instrumentation used in the CILRT is constdered special test instrumentation and therefore should be calibrated no more than six months prior to the start of the CILRT as required by the licensee's procedure ACP-13.1, Rev. 1.
The licensee calibrated the wet test meter before the second CILRT attempt.
No items of noncompliance or deviations were identified, i
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5.
Containment valve Lineup
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The inspector selected several penetrat!ons from the piping and instrumentation diagram to verify the valve line-up. The inspector also checked tags in the Control Room for agreement with the valve line-up.
No items of noncompliance or deviations were identified.
6.
Test Procedure The inspector reviewed the test procedure during the test.
Signof fs were noted indicating review by plant management were completed prior to the test commencement.
With the exception of the below listed items, the inspector had no further questions or comments in this area.
a.
Volume Weighting The summation of the volume weighting factors for the resistance temperature detectors and relative humidity detectors currently does net equal unity. This itse is unresolved pending completion of corrective action by the licensee.
b.
CCW Temperature Control
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CCW temperature changes have resulted in difficulties in analyzing leakage rate data due to changes in relative humidity caused by the changes in CCW temperature.
The inspector stated that the procedure should include this information and require CCW temperature to be logged in the data sheets, c.
Stabilization Period
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From the available data for the 1968, 1975, and 1978 CILRT, it appears that the leakage rate did not level until about 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br /> into the test.
The inspector stated that the procedure should specify a stabilization criterion.
d.
Ac$eptance Criteria Section V.B.3 of Appendix J specifies the requirement for analysis and interpretation of CILRT results. The inspector informed the licensee of the NRC position that the corrected measured leak rate at the 95% upper confidence level must be less than
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Data Rejection During the CILRT data may be rejected as an outlier provided definitive data-rejection criteria have been established.
The inspector stated that the procedure did not include the rejection criteria, f.
Calculator Program The procedure stated that the point-to-point method of data analysis is to be used.
The inspector informed the licensee that the analysis method used by the NRC is the mass point analysis technique.
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No items of noncompliance or deviations were identified.
7.
_D_ata Management s
During the conduct of the test, the licensee experienced difficulty evaluating the hourly calculations of leak rates.
On several occasions the licensee repeated the calculations of the hourly leak rates and concluded that the initial calculations were in error.
The licensee determined that the IBM cards used for the WANG calculator were the cause of the errors.
The raw data was recorded by Control Room operators who were required to average the lh p value due to a noisy differential pressure signal.
The operators had to exercise caution in reading the recorders after it was noticed that a change in trend occurred at shift change during the first CILRT attempt.
The inspector stated that such difficulties could be avoided by use of equipment with digital display and automated data recording. The inspector stated that for tests where such small leak rates ((0.075 w%/ day) must be measured, the accuracy of the instruments, including readout and data collection techniques, must be carefully controlled, or else the test results can be confounded by systematic
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errors which are not always easy to detect and control.
No items of noncompliance or deviations were identified.
8.
Unresolved Items Unresolved items are matters about which more information is required in order to ascertain whether they are acceptable items, items of noncompliance, or deviations. An unresolved item disclosed during
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the inspection is discussed in Paragraph 6.
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9.
Exit Interview
An exit interview was conducted at the conclusion of the inspection with the licensee representatives denoted in Paragraph 1.
The inspector concluded from the information available that the second CILRT confirmed that the containment leakage was acceptable.
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