IR 05000338/1982030
| ML20027C251 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 09/17/1982 |
| From: | Conlon T, Ruff A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20027C245 | List: |
| References | |
| 50-338-82-30, 50-339-82-30, NUDOCS 8210150194 | |
| Download: ML20027C251 (4) | |
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Report Nos. 50-338/82-30, 50-339/82-30 Licensee: Virginia Electric and Power Company Richmond, VA 23261 Facility Name:
North Anna Docket Nos. 50-338, 50-339 License No. NPF-4 and NPF-7 Inspection at North Anna site near Mineral, VA and Corporate Office, Richmond, VA Inspector: sNh m4 h
7-O 'Th A. B. Ruff Date Signed Approved by:
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h / 7' [L T. E. Conlon, Section Chief Date Signed Engineering Inspection Branch Division of Engineering and Technical Programs SUMMARY
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Inspection on August 31-September 3,1982.
Areas Inspected This routine, announced inspection involved 23 inspector-hours on site and at the general office in the areas of generator step-up (GSU) transformer failure of August 22, 1982, and the licensee's recommendations and inspector follow-up items that were identified as a result of GSU transformer failure in 1981.
Results Of the areas inspected, no violations or deviations were identified.
8210150194 820923 gDRADOCK05000
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REPORT DETAILS 1.
Persons Contacted Licensee Employees W. R. Cartwright, Station Manager
- E. W. Harrell, Assistant Station Manager
- H. L. Hogg, Jr., QA Manager
- M. E. Fellows, Staff Assistant P. Knutsen, Design Control Engineer D. Thomas, Electrical Maintenance Supervisor J. Peterson, Senior Nuclear Training Coordinator
- H. L. Sutton, Superintendent, Electrical Equipment (Richmond)
- J. McGregor, Staff Engineer, (Richmond)
NRC Resident Inspector
- M. Shymlock
- Attended exit interview on September 2,1982
- Richmond, Virginia exit interview on September 3,1982 2.
Exit Interview The inspection scope and findings were summarized on September 2 and 3, 1982, with those persons indicated in paragraph 1 above.
The licensee acknowledged the inspection findings.
3.
Licensee Action on Previous Enforcement Matters Not inspected.
4.
Unresolved Items Unresolved items were not identified during this inspection.
5.
Inspection of Generator Step-up (GSU) Transformer Failure on August 22, 1982 An inspection was made as a result of GSU phase-B transformer failure on August 22, 1982. This failure was considered to be caused by a broken bolt from the condenser guide bracket.
The broken portion of the bolt lodged between the condenser and the ground sleeve of the high voltage (HV)
This initiated a fault that eventually caused the tran;former to
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fail. This type of failure is most unusual and would not be expected to happen in other HV bushing of this type.
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A new transformer was installed. Standard electrical tests were performed and oil samples were taken on the remaining GSU transformers. These tests
and samples indicated that the transformers were satisfactory for service.
An ultrasonic corona sensor with readings in pico coulombs was installed to monitor corona on phase A and C transformers.
Readings of this sensing circuit, with plant at approximately 100*f power and various lower power
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levels, indicate that corona levels are satisfactory.
Within the areas examined, no violations or deviations were observed.
6.
Review of Licensee's Recommendation and Inspector Follow-up Items (IFI)
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Resulting From GSU Failure and Fire in 1981 l
The inspector reviewed the recommendations in the licensee's transformer i
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Failure Analysis Report of 1981 which was transmitted to Region II by letter t
of January 8,1982, and the IFI's of Regions II's report 50-339/81-16.
Corrective actions have been implemented or initiated for items in these l
reports. The IFI's with regard to the above are discussed below.
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a.
(Closed) IFI 50-339/81-16-02, The Cause of Three GSU Transformer j
Failures Since November 1980 Should Be Determined to Assure that i
Generic Concerns are Identified and Addressed. The licensee's report
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states that there were no generic transformer design or system problems associated with those failures. They made several recommendations as a result of their investigation and have subsequently implemented or initiated actions to put these items into operation.
b.
(Closed) IFI 50-339/81-16-05, Action Should be Taken to Instruct Personnel Not Involved in Emergency Plan Activities to Stay Clear of These Activities.
The station manager has issued instruction to station personnel to stay clear of emergency plan activities and this
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item is discussed in the Advance Employee's Training Presentation, t
c.
(0 pen) IFI 50-339/81-16-06, Criteria for Placement of Transformers Within a Common Diked Area. This item is covered by project NP-76 and Request for Engineering Assistance (REA) 002 in the Power Station Engineering and Construction Department.
The scope of the work for this item is still being formulated.
This item will remain open j
pending a future inspection.
d.
(Closed) IFI 50-339/81-16-07, Evaluate Need for Automatic Deluge Water Spray Extinguishing System for Spare GSU Transformer. The licensee states that the spare transformer will not be stored adjacent to the turbine building.
e.
(Closed) IFI 50-339/81-16-08, Evaluate Need for More Than One Means of Roof Access on Buildings Exceeding Fifty Feet in Height. This item for i
the turbine building, is covered by project NP-71B and REA-003.
The scope of work has been formulated, approved by site personnel, and has
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been sent to the Budgeting Department.
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(Closed) IFI 50-339/81-16-08, Evaluate Need for Hose Station on The Roof of Building Exceeding Fif ty Feet in Height. This item, for the turbine building, is covered by project NP-71B and REA-003. The scope of the work has been formulated, approved by site personnel, and has been sent to the Budgeting Department.
g.
(Closed) 50-339/81-16-11, Evaluate Need for a Communication System on a
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Common Radio Frequency for all Responding Fire Fighting Organizations.
The licensee states that a common radio frequency communication involves the FCC and that it is not feasible or possible to implement this type of communication system.
Since Security Officers must accompany all undesignated vehicles on site, it is considered that the existing system, utilization of security force radios on plant operation channels, will suffice.
h.
(Closed) 50-339/81-16-14, Review Scope of Maintenance Program for Fixed Fire Protection Systems.
The licensee has initiated a seniannual preventive maintenance program for fixed fire protection systems by developing P.M. code M-00-FP/SA-1 and SA-2.
This program checks fire hydrants, and gate valves of the fixed fire protection system including their operability and a brief flush.
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