IR 05000336/1979012
| ML19242C853 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/15/1979 |
| From: | Caphton D, Tanya Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19242C852 | List: |
| References | |
| 50-336-79-12, NUDOCS 7908140051 | |
| Download: ML19242C853 (6) | |
Text
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.. U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION I
Report No. 50-336/79-12 Docket No. 50-336 License No. DPR-65 Priority - Category C Licensee: Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06101 Facility Name: Millstone Nuclear Power Station, Unit 2 Inspection At: Waterford, Connecticut Inspection Conducted: April 25-30, 1979 Inspectors: ,bc 6Cl2 b _LT-7 7 T. H. ' Smith, Reactor Inspector Date Signed (_ I
[[ N Approved By: [c O
' D. L. Caphren, Chief Dade Sig'ned' Nuclear Support Section No. 1 Inspection Summary Inspection on April 25-30, 1979 (Report No. 50-336/79-12) Areas Inspected: Routine, unannounced inspection by a regional based inspector of the Containment Integrated Leak Rate Test (CILRT) and licensee action on previous inspection findings.
The inspection involved 39 inspector-hours on site by one NRC regional based inspector.
Results: No items of noncompliance or deviations were identified.
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- . . . DETAILS t 1.
Persons Contacted The below listed technical and supervisory level personnel were centacted.
Northeast Nuclear Energy Company J. Crockett, Engineer
- E. Farrell,' Unit 2 Superintendent
, J. Harris, S/U Engineer R. Stratman, Engineer Bechtel G. Cranston, Engineering Supervisor M. Downs, Engineering Specialist NRC
- J. Shedlosky, Resident Reactor Inspector The inspector also talked with and interviewed several other members of the engineering and operating staffs.
- Denotes those present at the exit interview.
2.
Licensee Action on Previous Inspection Findings (0 pen) Unresolved Item (336/79-05-03): These items relate to the Containment Integrated Leak Rate Test (CILRT) Procedure.
The below lettering corresponds to that in report 79-05.
The inspector verified that each item was satisfactorily addressed during the current CILRT.
Not all items, however, have been included into the procedure, so that assurance of their inclu-sion in all future CILRT's has not been provided. The items which still need to be addressed procedurally remain open as indicated below.
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- ~. . - Y . -3-a.
The internal structural inspection of the containment was conducted using the Containment Liner Inspection surveil-lance procedure.
Inspection of the accessible external containment structure was conducted by the test engineer.
No abnormal conditions were discovered.
(0 pen) b.
Containment sump, pressurizer and reactor coolant system level changes occurring during the CILRT will be measured and evaluated.
A licensee's representative stated that additions would be made to the measured containment leakage rate if rmquired.
(0 pen) c.
Although not specifically stated in the procedure, a licensee's representative stated that the CILRT would meet the following acceptance criteria: the measured leak rate at the 95% upper confidence level plus any required addi-tions/ corrections would be less than 0.75 La.
(0 pen) d.
A psychrometer of suitable accuracy was used to check the humidity detectors prior to the test.
(Closed) Depressurization of the containment will be continuously e.
monitored using a sample hose connected to a Continuous Air Monitor (CAM).
(0 pen) f.
A plot of containment air temperature was maintained during the test.
The test procedure was revised to include the requirement that the extrapolated value of the calculated leak rate be less than 0.75 La.
(Closed) g.
The pressurization and depressurization valve lineups have been modified.
There are no inconsistencies in the revised lineups and a vent path has been provided outside the containment on the pressurizatioa line.
(Closed) h.
A general statement in the valve lineup portion of the procedure required that containment isolation valves be drained, but specific valve draining lineups were not
iOJ-b<ch
e . s _4_ provided.
The test engineer checked all water filled - systems to ensure draining was complete.
(Open) i.
The inspector verified that test pressure was greater than Pa at the start of the test, after temperature stabi-lization was completed.
(0 pen) 3.
Containment Integrated Leak Rate Test a.
General On April 28-30, 1979, Millstone Nuclear Power Station, Unit 2, performed a CILRT at a pressure of Pa (54 PSIG).
The test was performed in accordance with procedure SP 2605B, Revision 0, " Containment Leak Rate Test -Type 3.," , dated April 27, 1979.
The inspector reviewed the pracedure, witnessed various portions of the test, and independently, . _ verified the test calculations.
Details of the tert are discussed below.
The inspector had no further questions or comments other than those which follow.
b.
Instrumentation The.tuspector reviewed the calibration information for the test resistance temperature detectors, dew point instru-ments, pressure detectors and the verification test flow-meter to verify traceability to nationally recognized standards.
All instrumentation was suitably traceable.
c.
Valve Lineups Prior to the start of the test, the inspector reviewed the valve lineup portion of the CILRT procedure and identified that the procedure contained only a general statement concerning the draining of water filled systems, rather than specific system by system guidance.
The test director stated that personnel performing valve lineups were instructed to drain systems as valve lineups were per-f o rmed. As a backup, all systems were checked and drained if necessary.
The inspector had no further questions regarding the valve lineup for this test with the except-ion as noted above in 2 h.
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- . -5-During the test, the inspector checked the position of a random sample of valves from the lineup sheets. No dis-crepancies were noted.
d.
Chronology '/28 1145 Commenced contain=ent pressurization , (Leak checks being conducted as the containment is pressurized).
4/29 1402 Pressurization completed (54.3 PSIG).
Compressors secured.
Commenced stabilization period.
1805 Tempera ture stabilization satisfactory.
Commenced CILRT.
2105 Initial data sets indicate leak rate is within the acceptance criteria.
4/30 1005 Completed the CILRT with a leak rate at the 95% upper confidence level of approximately 0.074%/ day.
Commenced verification test by imposing a controlled leak of approximately 0.486%/ day.
1750 Verification test complete.
e.
CILRT Results On April 30, 1979, the CILRT was successfully completed.
The inspector's calculated results are summarized below.
(Results reported in percent per day unless otherwise stated).
Acc ep tanc e Item Criteria Results (1) CILRT Leak Rate by Mass Point - 0.064 Technique , - i !s') 1- ,n
-6-(2) Mass Point Upper 95% Confidence Level of Leak Rate 0.375 0.074 (3) Supplenental Verification Test Dif f erence .25 La .15 La
Exit Interview At the inspection's end the inspector hcid a meeting (see Detail 1 for attendees) to discuss the inspection scope arl findings.
No items of noncompliance were identified and there were no unresolved items.
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