IR 05000220/1979003
| ML17053A548 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/21/1979 |
| From: | Caphton D, Foley T, Tanya Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML17053A547 | List: |
| References | |
| 50-220-79-03, 50-220-79-3, NUDOCS 7903300509 | |
| Download: ML17053A548 (14) | |
Text
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NUCLEAR REGULATORY COMMISS OFFICE OF INSPECTION AND ENFORCEM T
Region I Report No. 50-220/79-03 Docket No.
50-220 License No.
DPR-63 Priority Category C
Licensee:
Niagara Mohawk Power Corporation 300 Erie Boulevard West Syracuse, New York 13202 Facility Name.
Nine Mile Point Nuclear Station, Unit
Inspection at:
Scriba, New York Inspection conduct d:
anuary 29-31, 1979 Inspectors:
T.
H.
th, Reactor Inspector T. Foley, R
ctor nspector
~ so/7t date signed go 7 date signed Approved by:
q(g D. L. Cap ton, Chief, Nuclear Support Section No.
1, R08NS Branch date signed da e s>gned Ins ection Summar
Ins ection on Januar 29-31, 1979 Re ort No. 50-220/79-03 A~I*
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b of the containment integrated leak rate test procedure.
The inspection involved 38 inspector-hours on site by two NRC regional based inspectors.
Results:
No items of'oncompliance were identified.
Region I Form 12 (Rev. April 77)
790'OOTH
~I
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Il
DETAILS 1.
Persons Contacted D. Balduzzi, Central File Supervisor G. Leskiw, guality Assurance W. Nosher, Office Supervisor
- T. Perkins, Station Superintendent
- M. Silliman, Results Superintendent B. Taylor, Instrument and Control Supervisor
- denotes those present at the exit interview.
The inspector also talked with and interviewed other members of the technical, engineering and operations staffs.
2.
Containment Inte rated Leak Rate Test CILRT a.
General The inspector reviewed the CILRT procedure, Nl-ISP-IC-23,
"Integrated Leak Rate Test of Primary Containment PCILRT (Type A Test)" (Draft - undated) for technical adequacy and compliance with 10 CFR 50 Appendix J, ANSI N45.4,'nd Nine Mile Point Technical Specifications.
The test is scheduled to be run in accordance with Bechtel. Corporation's procedure BN-TOP-l, which-calls for a test of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> duration.
The inspector therefore verified that the CILRT procedure satisfied the provisions of BN-TOP-1.
During discussions of the procedure with licensee personnel, the inspector made the following comments.
(1)
Evaluation Techni ue The NRC currently accepts the mass point data evaluation technique in determining'he,:containment,.leak.
rate.
(2)
Acce tance Criteria The NRC requires that the CILRT meet the following acceptance criteria.
Measured leakage at test pressure (Lm(22)),
plus corrections (type C test add-ons, containment volume changes due to level changes, etc.),
must be less than or equal to 75Ã of the allowable test.leak rate (.75Lt'
0..824/day) at the 954 upper confidence leve (3)
Test Failure The last CILRT conducted at Nine ttile Point in November 1975 initially failed.
In such cases, Appendix J,Section III.A.6.b requires that a test be run each refueling outage'until two consecutive tests are successful.
The inspector had no further questions at this time concerning the procedure except as noted below.
b.
CILRT Procedure The below items associated with the CILRT procedure are unresolved and are collectively designated as Item No. (220/79-03-01).
(1)
Volume hei htin Factors If instrumentation becomes inoperative during the test, there is no provision in the procedure as to how volume weighting factors will be reassigned.
(2)
Dew Point Instrumentation BN-TOP-1 states that six dew point sensors are generally required to conduct the CILRT.
The procedure currently calls for only four.
Justification for a reduction in the number of dew point sensors was not available at the time of the inspection.
(3)
Containment Volume The volume of the drywell stated in different sections of the procedure is inconsistent.
Paragraph 5.1.1 states that the drywell volume is 183,437 cubic feet.
The total of the RTD volume fractions in paragraph 6.0 is 185,437 cubic feet.
(4)
Calibration Cor rections BN-TOP-1 requires that calibration curve correction fa'ctors be applied to each data point of each sensor input.
The current..procedure does not contain this
.
requiremen L
4'5)
(6)
Atmos heric Conditions ANSI N45.4 requires that atmospheric pressure and ambient temperature be recorded hourly.
This requirement is not in the current procedure.
Technical S ecifications The Nine Mile Point Technical Specifications currently require that the Type A test duration shall not be less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
A technica1 specification change will be required before an eight hour test would be valid.
Verification Test Criter ia The verification test acceptance paragraphs 5.3.19 and 6.0 of the to Appendix J,Section III.A.3.b.
test, the difference between the and the Type A test data must be 0.25Lt.
The procedure currently to be less than or equal to 0.25 Pressure Switches criteria, as stated in procedure, do not conform For a reduced pressure supplemental test data less than or equal to requires this difference La.
The procedure currently calls for high drywell pressure switches 201.2-07, 01, 14 and 13 to be'solated from the containment.
This removes a potential leakage path from the containment as these switches would be subjected to containment pressure during a loss of coolant accident.
If the switches remain isolated, Type C tests must be conducted with the results added to the Type A test leak rate.
(9) ~OR During the CILRT outlying data may be rejected provided definitive data. rejection criteria have been established.
, Currently, 'there are no such criteria in the procedure.
Valve Lineu Review Qn a sampling basis, the inspector checked the CILRT procedure valve lineup sheets to verify that:
each penetration was provided with a valve lineup; valves were in the correct position; proper vent paths were provided; and artifi'cial leakage barriers were not created which could mask containment leakage.
During the check the inspector noted the following:
(1)
Main Steam Line Penetration X-2A The valve lineup for penetration X-2A requires that valve MS-701 be shut and MS-703 be open with the down stream cap removed.: Based on a review of the Nine Mile Point PAID C-18002-C, Revision 12,
"Steam Flow, Main Steam and High Pressure Turbine", this valve lineup appears to create a direct path for leakage from the containment to the outside atmosphere.
(2)
Dr ell and Recirculation Pum Coolin Penetrations X-156 157 and X-12B, 13B The current valve lineup does not contain provisions for testing the containment isolation valves of these systems during the CILRT.
Based on the requirements stated in 10 CFR 50, Appendix J, Section III.A.I.dit appears that these systems must be vented and drained for the CILRT or type C tests performed on the containment isolation valves with the results added to the type A test.
(3)
Containment Sam lin Penetrations X-20 64, 98, 134 and 139 The current procedure does not contain valve lineups for the systems associated with these penetration ~ l
(4)
Feedwater and Li uid Poison Penetrations X-4A, 4B and X-131 The current valve lineup. for the Primary Feedwater System does not address valves FW-57/30-13 and FH-58/30-14.
If these valves are shut during the CILRT the vent path would be isolated and an artifical leakage barrier established.
The valve lineup for the Liquid Poison System currently designates a vent path for the system, however, the lineup also causes the vent path to be isolated from the system.
This creates an artificial barrier to containment leakage.
The above items are unresolved and are collectively designated Item No. (220/79-03-02).
3.
Print Error During review of the CILRT procedure valve lineups, an apparent error in station controlled prints was discovered by the inspectors.
PAID drawings C-18002-C Sheet 1, Revision 12 and C-18006-C, Sheet 1, Revision 2, both show the same portions of the head spray system, however, the labeling of four valves differs. It was determined by visual observation by licensee personnel that PAID drawing C-18002-C has head spray valves CRD 707, 708, 709 and 710 incorrectly labeled as CRD 709, 710, 711 and 712.
Upon further investigation, including review of Administrative Control Procedures, Document Control Procedures and interviews with station personnel, it was determined that there is apparently no station procedure which requires drawings to be updated when differences between drawings and as built conditions are discovered.
This item is unresolved pending further review in a subsequent inspection.
(220/79-03-03)
4.
Unresolved Items Items about which more.information is required to determine accepta-bility are considered unresolved.
Paragraphs 2.b, 2.c and 3 of this report contain unresolved item.
Exit Interview At the inspection's end the inspectors held a meeting (see Detail
for attendees)
to discuss the inspection scope and findings.
The unresolved items were identifie k