ML20195K255
| ML20195K255 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/14/1988 |
| From: | Dance H, Hopkins P, Prevatte R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20195K241 | List: |
| References | |
| 50-395-88-13, NUDOCS 8806290376 | |
| Download: ML20195K255 (9) | |
See also: IR 05000395/1988013
Text
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UNITED STATES
NUCLEAR REGULATORY COMMISSION
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R EGION 11
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101 MARIETTA STRE ET, N.W.
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Report No. :
50-395/88-13
Licensee:
South Carolina Electric and Gas Company
Columbia, SC 29218
Docket No.:
50-395
License No.: NPF-12
Facility Name: V. C. Summer
Inspection Condu. ted:
ay 1-3 , 1988
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Inspect Ps:
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RichardL.frevatte,
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Date Signed
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Approved by:
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Hugh C. Dance, Section Chief
Date Signed
Division of Reactor Projects
SUMMARY
Scope:
This routine, announced inspection was conducted by the resident
inspectors onsite, in the areas of monthly surveillance observations, monthly
maintenance observation, operational safety verification, engineered safety
features system walkdown, design, design changes and modification and other
areas.
Results:
One violation was identified, failure to meet limiting condition of
operation prior to mode changes.
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8806290376 880616
ADOCK 05000395
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REPORT DETAILS
1.
Persons Contacted
Licensee Employees
- D. Nauman, Vice President, Nuclear Operations
- 0. Bradham, Director, Nuclear Plant Operations
D. Moore, General Manager, Engineering Services
M. Williams, deneral Manager, Nuclear Services
- K. Nettles, General Manager, Nuclear Safety
J. Skolds, General Manager, Station Operations
- M. Browne, General Manager, Station Support
G. Moffatt, Manager, Mainter.ance Services
- G. Soult, Manager, Operations
A. Koon, Manager, Nuclear Licensing
C. Bowman, Manager, Scheduling and Modifications
K. Woodward, Manager, Nuclear Operations Education and Training
W. Baehr, Manager, Chemistry and Health Physics
S. Hunt, Manager, Quality Systems
K. Beale, Manager, Nuclear Protection Services
C. Prica, Manager, Technical Oversite
D. Warner, Manager, Core Engineering and Nuclear Computer Services
J. Shepp, Associate Manager, Operations
- W. Higgins, Supervisor, Regulatory Compliance
NRC Resident Inspectors
- R. Prevatte, Senior Resident Inspector
- P. Hopkins, Resident Inspector
Other licensee employees contacted included engineers, technicians,
operators, mechanics, security force members, and office personnel .
- Attended exit interview
2.
Exit Interview (30703)
The inspection scope and findings were summarized on June 1,1988, with
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those persons indicated in paragraph 1 above.
The inspectors described
the areas inspected and discussed the inspection findings.
The licensee
acknowledged the violation described in paragraph 5.b.
The licensee did
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not identify as proprietary any of the materials provided to or reviewed
by the inspectors during the inspection.
Note:
A list of abbreviations used in this report is contained in
paragraph 11.
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3.
Monthly Surveillance Observation (61726)
The inspectors observed surveillance activities of safety-related systems
and components to ascertain that these activities were conducted in
accordance with license requirements.
The inspectors observed portions
of 26 selected surveillance tests including all aspects of the Diesel
Generator Operability Test, STP 125.002.
The inspectors also verified
that required administrative approvals were obtained prior to initiating
the test, testing was accomplished by qualified personnel, required test
instrumentation was properly calibrated, data met TS requirements, test
discrepancies were rectified, and the systems were properly returned to
service.
No violations or deviations were identified.
4.
Monthly Maintenance Observation (62703)
The inspectors observed maintenance activities of _ safety related systems
and componeras to ascertain that these activities were conducted in
accordance with approved procedures, TS and appropriate industry codes
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and standards.
The inspectors also determined that the procedures used
were adequate to control the activity, and that these activities were
accomplished by qualified personnel.
The inspectors independently veri-
fied that equipment was properly tested before being returned to service.
Additionally, the inspectors reviewed several outstanding job orders
to determine that the licensee was giving priority to safety related
maintenance and a backlog which might affect its performance was not
developing on a given system.
The following specific maintenance
activities were observed:
MWR 8600458
Repair bulb holder for the autostart indication on DG
"B"
PMTS P010185
Inspect, clean, repair and check integrity of terminations
in DG "B" control cubicle
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MWR 88G0041
Repair fire door barrier 103 east penetration
PMTS P100381
Tear down, inspect and repair operator for CCW supply
header valve XVB9524B-CC
PMTS P0103094
Inspect and repair motor starter for XVB95268-CC
MWR 8701488
Inspect and repair oil leak from bearing on CCW pump "C"
MWR 88G0081
Investigate and repair trouble alarm on smoke detector
system
MWR 87T0297
Perform east & west penetration access area temperature
test
MWR 8800399
Calibrate condensate makeup flow indicators
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MWR 88G0093
Repair smoke detectors
MWR 8810125
Verify and mark up drawing for environmental system
MWR 880446
Investigate and repair turbine switch gear cooling trouble
alarm
PMTS P0103347
Inspect and repair waste evaporator
PMTS P0098194 Inspect and repair heat shrink terminations en IDB air
handling unit supply fan motor
MWR 880678
Investigate and repair loose wires on diesel fire pump
start switch
MWR 213630026 Install cable in the turbine building and control building
FMTS P0102479 Calibrate service water flow indicator loop "B"
MWR 88G0115
Repair smoke detector IXA 4923A
MWR 8800679
Trouble shoot and repair the component cooling water "B"
pump flow problems
PMTS P0103570 Calibrate instrumentation on conductivity recorder
(
PMTS P0102480 Loop calibration for RCP "A" 1 seal water flow
PMTS P010272
Loop calibration for SG "B" supply header pressure
transmitter
MWR 8800682
Investigate and repair inverter XIT 5909
MWR 87M0532
Replace electrical thermo link on air handling unit
A(XF0021A)
MWR 87M0533
Replace electrical thermo link on air handling unit
B(XF0021B)
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PMTS P0094759 Perform electrical maintenance on SWP's "A",
"B",
and "C"
PMTS P0094671 Perform maintenance on the transfer switches for
SWP's "A", "B",
and "C"
MWR 88C0072
Inspect and repair leaks in main condenser
No violations or deviations were identified.
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5.
Operational Safety Verification (71707)
a.
The inspectors toured the control room, reviewed plant logs, records
and held discussions with plant staff personnel to verify that the
plant was being operated safely and in conformance with applicable
requirements. Specific items inspected in the control room included:
adequacy of staffing and attentiveness of control room personnel, TS
and procedural adherence, operability of equipment and indicated
control room status, control room logs, tagout books, operating
orders, jumper / bypass controls, computer printouts and annunciators.
Tours of other plant areas were conducted to verify equipment
operability, control of ignition sources and combustible materials,
the condition of fire detection and extinguishing equipment, the
control of maintenance and surveillance activities in progress, the
implementation of radiation protective controls and the physical
security plan.
Tours were conducted during normal and random off
hour periods.
b.
On May 12, 1988 at 4:46 a.m., the plant experienced a reactor trip
and SI from 100% power.
The above resulted from full closure of
the MSIV 2801 "A" while performing the Main Steam Valve Operability
Test, STP 121.002.
The closure of MSIV "A" caused the steam flow to
increase rapidly from SG "B"
and "C".
This resulted in a rapid
decrease in steam line pressure in steam lines
"B"
and
"C" which
actuated the protection circuitry for low steamline pressure reactor
trip /SI.
All systems, with the exception of service water flow to
the RBCU's, functioned as required.
The RBCU's are normally supplied with cooling water from the
industrial cooling water system, a non-safety grade system.
On
receipt of a SI signal, the RBCU's are aligned to the SWS and
provided with cooling water boosted in pressure by the SWBP's.
This
occurred immediately after the above trip and SI.
However, the
required flow of 4000 GPM per train was never fully achieved and
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mair.tained on "A" or "B" train while the units operated on service
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water from approximately 4:54 a.m. until 5:34 a.m.
The above information is contained in the computer post trip review
printout.
SAP 132, Off-normal Occurrence Evaluation, Reporting and
Resolution, required that this information be reviewed by the shif t
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engineer prior to plant restart.
This information was reviewed by
the shift engineer however, the inadequate flow to the RBCU's was not
identified.
On May 16, 1988 ISEG reviewed the computer printouts
(trip package) associated with the reactor trip and identified that
adequate flow had never been achieved by the RBCU's while operating
on service water.
Both "A"
and "B" trains were then declared inoper-
able on May 16, '.988, at 3:00 p.m.
The "A" train units were retested
and restored to an operable status on May 17, 1988, at 1:30 p.m.
The
"B" train units were returned to an operable status after chemical
cleaning on May 23, 1988, at 10:26 p.m.
After completion of the
cleaning on "B" train the
"A" train units were taken out of service
for a period of four days and chemically cleaned.
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After chemically cleaning both RBCU's, problems were again experi-
enced with RBCU's for train "B".
This occurred when train "B"
was
swapped from service water pump "B" to pump "C".
After these pumps
were swapped flow decreased over a period of approximately four
hours from 4100 GPM to approximately 3900 GPM.
At that time this
train was swapped back to pump "B".
The flow was still below the TS
limit of 4000 GPM. At that time the valves associated with train "B"
RBCU were cycled and flow on this train increased to slightly above
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4000 GPM.
During the cycling of valves a relief valve on the service
water cooling inside the reactor building lifted and failed to fully
reseat.
An entry was made into the reactor building and the valve
was repaired.
The above problem resulted from what is believed to be infestation of
corbicula or iron oxide deposits in stagnant service water piping
between the SWBP's and the service water isolation valves for the
RBCU's. When the RBCU's were transferred to service water during the
safety injection, the corbicula or iron oxide deposits were swept
into the cooling units and plugged some of the small diameter tubing.
Since it was concluded that corbicula could be the cause of system
flow problems, commercial diving contractor services were obtained to
clean the service water intake structure bays.
On May 28, 1988,
divers cleaned the service water intake structures and removed
approximately 15-20 gallons of small clams.
Both trains of RBCU were declared operable on May 28, 1988. Manage-
ment is currently analyzing data and evaluating how this system
will be operated and what testing will be needed to maintain this
system operable.
The failure of the reactor operator to identify the low flow from
SWBP "B" and the RBCU's coupled with the shif t supervisors and shif t
engineers failure to conduct a thorough post trip review resulted in
the unit beirg restarted on May 12, 1988, at 8:24 p.m. and returning
to power operation on May 13, 1988, at 00:21 a.m.
Thit is contrary
to the requirement of TS 3.0.4 which requires that all limiting
conditions of operations be met prior to exiting Mode 3 and cntering
Mode 2 and Mode 1.
This is a violation, failure to meet the limiting
condition of operation prior to mode changes, 88-13-01.
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c.
On May 26, 1988, the licensee identified that circulating water tube
leaks existed in the "A" section of the main turbine condenser.
A
decision was made to reduce the plant to 40 percent power and perform
the repairs with the unit on the line with one half of the condenser
isolated and drained.
Power was reduced on May 28,1988 to 40
percent.
The "A" section of the condenser was isolated and drained.
Two tube leaks in the high pressure and one in the low pressure
sections on "A" condenser were located and repaired.
The unit was
returned to 100 percent power on May 30, 1988.
On May 31, 1988 the plant again experienced problems with circulating
water leakage in the main condenser.
Power was reduced to
approximately 38 percent to reduce the effects of out of
specification chemistry.
The licensee with the assistance of a
contractor located and isolated the leaks to the "B" section of the
The plant is currently in the process of making
repairs.
This item will be tracked by the resident inspectors until
completion.
Additional details will be provided in the rext monthly
report.
One violation was identified as discussed in paragraph b. above.
6.
ESFSystemWalkdown(71710)
The inspectors verified the operability of an ESF system by performing a
walkdown of the accessible portions of the Diesel Generator Fuel Oil
System.
The inspectors confirmed that the licensee's system lineup
procedures matched plant drawings and the as-built configuration.
The
inspectors looked for equipment conditions and items that might degrade
performance (hangers and supports were operable, housekeeping, etc.) and
inspected the interiors of electrical and instrumentation cabinets for
debris, loose material, jumpers, evidence of rodents, etc. The inspectors
verified that valves, including instrumentation isolation valves, were in
proper position, power was a /ailable, and valves were locked as
appropriate. The inspectors compared both local and remote position
indications.
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No violations or deviations were identified.
7.
Design, Design Changes and Modifications (37700)
The inspectors reviewed design, design changes and modifications packages
initiated over the past two years.
The areas reviewed were reactivity
control, instrumentation, reactor coolant system, emergency core cooling
system, containment systems, plant and electrical power systems, radwaste
and power conversion systems.
A review of all modifications in the above
areas was cor. ducted.
After this review the following five modifications
were selected for a detailed review and followup to insure that the design
changes were appropriately reviewed, approved and implemented in
accordance with TS and established quality assurance and quality control
procedures.
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a.
Reactivity Control, MRF 20720 (open)
Installation of redundant PAMS class 1E neutron flux monitors
required by RG 1.97.
b.
Emergency Core Coolino, MRF 21097 (completed)
This MRF provides changes, as necessary, to implement the "installed
spare" for swing pumps.
The alignment both electrically and
mechanically of swing pumps had been incorrectly instituted in the
past due to confusion over interlocks.
c.
Containment Systems, MRF 21022 (open), safety-related
Reduce RBCV minimum flow from 4000 GPM to 2000 GPM by changing the
RBCU service water discharge valves (XVG 3109 "A", "B", "C", and "D")
from passive to active valves during an accident,
d.
Plant and Electrical Power Systems, MRF 20827 (completed)
Installation of single cell battery chargers with isolation fuses.
e.
Radwaste Systems, MRF 20752 (open)
Installation of new portable demineralizers for processing liquid
radwaste.
This review is expected to be completed in June 1988 and will be reported
in the next resident monthly inspection report.
8.
Other areas
The senior resident inspector spent the week of May 9-13, 1988, in NRR as
a participant in the NRR/ Region Il rotational exchange program.
This
program is designed to improve communications, increase technical skills
and provide a better understanding of the job and responsibilities of the
NRR project manager.
9.
List of Abbreviations
Annunciator Response Procedures
Component Cooling Water
Diesel Generator
DGF0S
Diesel Generator Fuel >0il System
Engineered Safety Feature
GPM
Gallons Per Minute
ISEG
Independent Safety Evaluation Group
LER
Licensee Event Report
MRF
Modification Request Form
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MWR
Maintenance Work Request
Nuclear Reactor Regulation
PAMS
Post Accident Monitoring System
PMTS
Preventative Maintenance Task Sheet
RBCU
Reactor Building Cooling Unit
Reactor Coolant Pump
Regulatory Guide
Station Administrative Procedure
Safety Injection
SPR
Special Procedures Report
Surveillance Test Procedures
SWBP
Service Water Booster Pumps
SWP
Service Water Pump
Service Water System
TS
Technical Specifications