IR 05000338/1980015
| ML19323C335 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 04/03/1980 |
| From: | Conlon T, Gibbons T, Merriweather N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML19323C331 | List: |
| References | |
| 50-338-80-15, 50-339-80-15, NUDOCS 8005150358 | |
| Download: ML19323C335 (3) | |
Text
,
. _ _ _ _ _
O O b/
O 3 h
,
h annov
/
UNITED STATES 8'
'o,7
NUCLEAR REGULATORY COMMISSION
,
$
9$
REGION 11
o 101 MARIETTA ST., N.W.. SUITE 3100 g
ATLANTA, G Ec3GIA 30303
APR 3 1980 Report Nos. 50-338/80-15 and 50-339/80-1; Licensee: Virginia Ele-*.ric & Power Company Richmond, VA 23261 Facility Name: North Anna Docket Nor. 50-338 and 50-339 License Nos. NFP-4 and CPPR-78 Inspection at North Anna site near Mineral, Virginia Inspectors:
f-3'80 T. D. Gibbons Date Signed Y Y/h/h,,4hr f ~ 5 - T0 N. Merriweather (Intern)
Date Signed Approved by:
p Y -- 8 - h T. E. Conlon, Section Chief, RCES Branch Date Signed SUMMARY Inspection on March 19-20, 1980 Areas Inspected This routine, unannounced inspection involved 21 inspector-hours on site in the areas"of degraded grid voltage protection and follow-up inspection of licensee identified items 338/79-20 05 and 339/~9-28-10.
Results
-
Of the areas inspected, no items of noncompliance or deviations were identified.
.
..
0
(
.
.
o DETAILS 1.
Persons Contacted Licensee Employees
- W. R. Cartwright, Site Manager G. L. Pannell, Staff Engineer J. D. K-llams, Superintendent Plant Operation NRC Resident Inspector
- M.
Kidd, Senior Resident
- A.
Tattersall, Resident
- Attended exit interview 2.
Exit Interview The inspection scope and findings were summarized on March 20, 1980 with those persons indicated in Paragraph I above.
3.
Licensee Action on Previous Inspection Findings Not inspected.
4.
Unresolved Items Unresolved items were not identified during this inspection.
5.
Licensee Identified Items (LER 79-057 and 50.55(e))
(Closed) Item 338/79-20-05 and 339/79-28-10:
Insufficient Capacity in the 4160 Volt Transfer su;ra. Cables and Breaker. The transfer buses supply power to units 1 and 2 normal and emergency A. C. buses from the reserve station service transformer (RSST) A, B and C when the unit generator (s)
are not operating. This arrangement is described in FSAR sections 8.1, 8.2 and 8.3.
The licensee has completed design change 79-32, " Reserve Station Service Power Systems Modifications".. The design change corrected inadequacies in
'~
components carrying off-site jower from the RSST to auxiliary and emergency A. C. buses in units 1 and 2.
The following changes ware made in the plant distribution system.
a.
Added 5 inch circular buses from RSST A, B and C to the side of the turbine building.
b.
Added 2000 MCM copper conductors from the circular buses to the auxiliary breakers.
.
-..- _. - - _-
..
.- _ _ -
-.-- - -
- -.
'
/E
..
-
..
. _ _. _
..... _,_..
_... _.
..
o
.
-2-Transfer buses D, E and F were modified by eliminating the bus c.
connections to breakers 15A1, ISBI and 15C1, respectively.
d.
Undervoltage relay control circuits were modified to accommodate the changes in the distribution system.
The inspectors examined the as-built installation and quality records.
Within the areas examined, there were no items of noncompliance or deviations identified. This item is closed.
6.
Independent Inspection Effort (Units 1 and 2)
The inspectors reviewed the logic diagrams for low voltage protection on the emergency buses, diesel generator load shedding bypass circuits, and test procedure 1-PT-36.9, " Degraded voltage / loss of voltage Functional Test".
Within the areas examined, there were no items of noncompliance or deviations identified.
e.
I pyW*
l l
i