ML20215F225
| ML20215F225 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/08/1987 |
| From: | Anderson C, Woodard C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20215F191 | List: |
| References | |
| 50-353-87-06, 50-353-87-6, IEIN-77-01, IEIN-77-1, IEIN-82-04, IEIN-82-4, NUDOCS 8706220285 | |
| Download: ML20215F225 (9) | |
See also: IR 05000353/1987006
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U.S. NUCLEAR REGULATORY COMMISSION
REGION I
Report No,
50-353/87-06
Docket No.
50-353
License No. CPPR-107
Priority - -
Category B
Licensee:
Philadelphia Electric Company
2301 Market Street
Philadelphia, PA 19101
Facility Name:
Limerick Nuclear Generating Station, Unit 2
Inspection At:
Limerick Generating Station
Inspection Conducted: May 4-15, 1987
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Inspectors:
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Carl H. Woodard',~ Reactor ' Engineer
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Approved by:
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C. JUAnderson, Chief Plant Systems
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Section, DRS
Inspection Summary:
Inspection on May 4-15, 1987 (Inspection Report
No. 50-353/87-06)
Areas Inspected:
Routine, onsite, unannounced inspection by one region-based
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inspector of activities pertaining to the safety-related electrical systems
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and components.
Results: One deviation and two unresolved items were identified.
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DETAILS
1.0 Persons Contacted
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1.1 Philadelphia Electric
- G. Lauderback, Quality Assurance Branch Head
- P. Naugle, Assistant Construction Superintendent
- J. Harding, Lead Facility Engineer
- T. Tucker, Quality Assurance Engineer
- J. Corcoran, Manager, Quality Assurance
- P. DiPaolo, Quality Assurance Branch Head
G. Tepper, Electrical Engineer
W. Shraff, Electrical Department Branch Head
W. Coyle, Electrical Project Engineer
C. Tuttle, Electrical Project Engineer
R. Panunto, Electrical Facilities Engineer
T. Dey, Quality Assurance Engineer.
1.2 Bechtel
- W. Bradley, Quality Assurance Engineer
- S. Loofbourrow, Quality Assurance Engineer
- G. Kelly, Quality Assurance Engineer
- D. Harder, Qaulity Assurance Engineer
- B. Mukherjee, Project Engineer
M. Drucker, Quality Assurance Engineer
G. Bell, Quality Assurance Engineer
G. Konecny, Quality Assurance Engineer
K. Stout, Quality Assurance Engineer
M. Dixon, Cable Yard Foreman
M. Twardowski, Lead Long Term Maintenance Engineer
R. Sewell, Electrical Engineer
N. Roy, Electrical Engineer
J. Schwamb, Lead Maintenance Quality Assurance Engineer
1.3 Nuclear Regulatory Commission
- R. Gramm, Senior Resident Inspector
- J. Kaucher, Resident Inspector
- Attendees at exit interview on May 14, 1987.
2.0 Procedure Review
A sample of the licensee's documents associated with the procurement,
storage, installation and inspection of the class IE electric system
components including wire and cable as listed in Attachment A were
reviewed by the inspector.
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This review was to ascertain whether the technical elements of the
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licensee's safety analysis report (SAR) and NRC requirements had been
adequately translated into applicable documents. Also, to determine if
the construction specifications, drawings, work procedures and
instructions were of sufficient detail and clarity to perform and control
the work,
No deficiencies were identified.
3.0 Record Review
A sample of licensee records, associated with the class IE electric
systems was reviewed by the inspector.
These records are listed in
Attachment A.
This review was to ascertain the effectiveness of the licensee quality
assurance program in the areas of procurement, storage, work activities
and inspection of the class IE electric systems to assure that the
systems and components perform their safety-related functions.
No
deficiencies were identified.
4.0 Electrical Components and Systems - Work Observation
The inspector observed work in progress and completed work to determine
whether activities related to safety-related electrical systems and
components are being controlled and accomplished in accordance with NRC
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requirements, safety analysis report commitments, and licensee
procedures.
4.1 Electrical Installations
The following installed electrical systems and components were
observed by the inspector.
- The B Train Emergency Diesel Generator System
- 4 Kv Safeguards Switchgear Panels
- 480 Volt Safeguards Load Center Panels
- Reactor Enclosure Damper Indicator / Control / Test Panel
- ATWS 4.16 Kv Switchgear Panel
- 125 Volt DC Battery Room 361
The following electrical systems work in progress was observed by the
inspector
- Replacement of Agastat 7000 series relays in the B Diesel
Generator Engine Control Panel with Agastat ETR series relays.
This
replacement was in response to Information Notices 77-01 and 82-04.
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- In place storage / maintenance program for the. emergency diesel
generators.
Observations made by the inspector included the following.
- The components and panels were properly identified.
- Protective dust covers were in place over the equipments / panels.
- Protective plywood covers were installed around the bases of panels
in heavy ~ construction activity areas..
- Electrical space heaters were properly energized in electrical
panels-and generators.
- Components were installed in the correct locations with the
correct orientation.
- Electrical separation was maintained.
- Electrical installation was being performed with approved
procedures.
- Where cable had been pulled to panels but not terminated, it was
wrapped with protective paper, the ends were taped and it was neatly-
coiled to an acceptable radius and secured with tyraps.
- In place storage / maintenance of the diesel generators was in
accordance with the manufacturers recommendations and approved
licensee procedures.
No violations were identified.
5.0 Electric Cable-Work Observation
The inspector reviewed activities related to safety related cables for
safety related systems to determine if they are controlled and accomplished
in accordance with NRC requirements, safety analysis report commitments
and license procedures. This included direct observations and an inde-
pendant evaluation of work performance, work in progress and
completed work.
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5.1 Storage
The following storage /maintanenance attributes of licensee construction
procedures CP-E-2 and CP-F-2 were observed by the inspector in the cable
receipt / storage / cut yard (Note: All permanent in plant cable is procured
to the same "Q" Specification requirements regardless of the application
(Q or Non-Q) except for GE furnished "non Q" PGCC cable).
- Permanent plant cable and PGCC (Q and Non Q) were stored / maintained
in separate areas of the cable yard.
- Master cable reels (as received from the manufacturer) were
identified with manufacturer's information and the Bechtel cable
code to provide cable identity and traceability.
- Sub-master cable reels were provided identity to provide
traceability to the master reel.
- Cable ends were sealed with end caps or tape.
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- Cable reels were stored above the concrete / ground to preclude cable
contact with surface water,
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- Temporary cable was stored in a remote area with a large letter
"T" painted on the cable reels.
- Licensee procedure CP-F-2 requires that the temperatures of cable
on reels be above 10' F for removal of cable.
The cable tempera-
ture upon removal was not currently being recorded.
The cable
yard foreman stated that when weather is cold, reels of cable are
brought inside to warm up prior to cable removal.
This is an
unresolved item (50-353/87-06-01) pending licensee demonstration
of the adequacy of existing controls for cable already pulled and
the potential need for additional controls for future cable pulls.
The following cable storage / maintenance attributes were observed by the
inspector in the permanent plant pre-cut cable laydown (interim
storage) area outside the turbine building.
- Pre-cut cable lengths were each uniquely identified by attached
labels which included the application information (pull from
location to destination) and traceability back to the
master reel from which it was pulled.
- Construction procedure CP-E-2 paragraph 5.2.3.22 requires measures
to " assure that cable in interim storage pending installations is
adequately protected including maintaining the reels in an upright
position, preventing cable contact with surface water or ground."
Some of the pre-cut cable in the laydown area was found to be on
reels and stored in an upright position; however, most of the
pre-cut cable was in tied coils. The coils were stored off
the ground on wooden pallets.
The inspector observed this area
daily from May 4-14, 1987. On May 13 the inspector observed a few
cable coils (approximately 20) which were not stored on pallets so
as to keep the cable off the ground and away from water submersion
damage.
These cable coils were stored on a plastic sheet.
The
inspector noted that the plastic sheets were dry and there was no
contact of the cables with water. The inspector pointed out to the
licensee that at a future time rainwater could pool on the plastic
and expose the cables to water.
The licensee agreed and took
prompt action to place the subject cable coils off the ground on
wooden pallets.
Further, since the cable storage procedure, CP-E-2
paragraph 5.2.3-22 did not specifically address coils of cable off
the cable reels the licensee agreed to issue a clarifying memo to
this procedure. The licensee's proposed corrective actions in-
clude revisions paragraph 5.2.3.22 to the procedure and providing
instructions to cable handling personnel in proper storage
practices. This is an unresolved item pending licensee development
of a procedure to control the temporary storage and protection of
coils of cable that are not on cable reels.
(50-353/87-06-02)
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5.2 Electrical Cable-Installation
Recorded installation data for several class IE cable installations
was reviewed for conformance with specification 8031-E-1412 and
construction procedure CP-E-2.
The calculated maximum cable pulling
tension and sidewall pressure for the installed cables was compared
to the data recorded during the installation.
In all cases the
actual pull tension and sidewall pressure was determined to be less
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than the specified limits.
The inspector reviewed cable calculations E-587 for cable pull
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package SE.01076.
This was a bulk pull of six single conductor 500
KCMIL and one single conductor 250 KCMIL cables through a five inch
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PVC conduit from Safeguards Load Center Distribution Panel 20B201 to
MCC Panel 20B129.
The inspector witnessed a portion of the pull which was from
Junction box 2AJ019 elevation 313' to junction box 2AJ020 elevation
299' and then to the cable duct at elevation 269' which led to panel
20B129.
The maximum allowable cable pull tension was 2245 pounds.
Calculated expected maximum pull tension was 1486 pounds.
However,
as a result of the good cable and conduit prelubrication, the pull
was made with a maximum of five men pulling by hand.
The pull
tension was estimated to be not in excess of 500 pounds based upon
.an average tension per man of 100 pounds per paragraph 2.1.3 of
specification E-1412.
No deficiencies were observed in either the cable pulling procedure,
records, calculations or the actual cable pull witnessed.
5.3 Electrical Conduit and Cable Tray Installation
The inspector observed installed cable tray and conduit at various
locations throughout the plant.
Inspections were made of conduits
2CLO46 from Motor Control Center MCC 20B221 to MCC 20B217 and conduit
2CLO47 from Motor Control Center MCC 20B221 to MCC 20B217 and conduit
2CL047 from Motor Control Center MCC 20B217 to RHR pump 2AP210.
No deficiencies were observed in the identification, routing,
configuration, or seismic supports for these conduits.
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5.4 Electrical Cable Terminations
The inspector observed wire and cable terminations in load centers,
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motor control centers, fuse panels, and in control cabinets at
several locations. An inspection was made of licensee cable termi-
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nations in Motor Control Centers MCC 20B221 and MCC 20B217 of
cable which was installed in accordance with cable schemes CB217-03A
and CB217-04A.
In addition, an inspection was made of control
wire terminations made by licensee in the "B" emergency diesel
generator engine control panel.
No deficier:cies were observed.
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6.0 Electrical Distribution System
6.1 Adequacy of Electrical Distribution System to Provide Required
Voltage Levels to Class IE Equipment.
The inspector reviewed the licensee's voltage profile studies and a
licensee letter to NRC dated October 22, 1981, in which low voltage
problems in certain class IE circuits were identified under Signi-
ficant Deficiency Report No. 52 for both Limerick Units #1 and #2.
In this letter the licensee confirmed a previous 50.55(e) telecon to
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the NRC in which potential undervoltage conditions for 166 safety
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related circuits were reported. Commitments were made by the
licensee to the NRC, in this letter, to complete design changes and
installation to correct the affected circuits for Unit 2 by June
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1986.
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The inspector reviewed the Bechtel " Final Report on Undervoltage
Problems in Certain Power And Control Circuits For LGS Unit #1 And
Common" dated February 1983 in which corrective actions were detailed
to correct a total of 534 deficient circuits for Unit #1 and circuits
common to Units 1 and 2.
The inspector was unable to locate a record
of design changes and installation in Unit 2 to correct the under-
voltage deficient circuits.
This technical item is a construction
deficiency outstanding open item (50-353/80-00-12).
Failure to meet
the Unit 2 June 1986 commitment to NRC is a deviation to their
commitment.
(50-353/87-06-03)
7.0 Definition of Unresolved Items
Unresolved items are matters about which more information 13 required in
order to ascertain whether they are acceptable, violations, or deviations
relative to the bulletin requirements.
Unresolved items identificd
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during this inspection are discussed in paragraphs 5 and 6 above.
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8.0 Exit Meeting
The NRC inspector conducted an exit meeting on May 14, 1987 with licensee
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representative (denoted in paragraph 1).
The NRC inspector summarized the
inspection findings and the licensee acknowledged these comments.
No
written material was provided to licensee personnel.
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Attachment A
Documents Reviewed
1.0 Final Safety Analysis Report, Chapter 8 - Electric Power
2.0 Construction Procedures (CP)
D-1 Processing of Nonconformence Reports, Rev. 4, 6/26/86
D-7 Construction Administration Control, Rev. 8, 5/20/87
E-1 Electrical Panel Modifications, Rev. 6, 5/20/87
E-2 Permanent Plant Cable Installation and Termination, Rev. 3, 2/2/87
E-3 Electrical Raceway, Rev. 3, 10/15/86
G-3 ' Long Term Storage / Maintenance / Lubrication of Permanent
Plant Equipment and Materials Prior to Turnover, Rev. 3, 10/22/86
F-2 Receipt Inspection-Storage and Withdrawal of
Materials / Equipment, Rev. 9, 5/18/87
3.0 Drawings
E-1412 Wire and Cable Notes and Detail, Rev. 30, 2/4/87
E-1406 Conduit and Cable Tray Notes, Symbols and Details, Rev. 6, 5/6/87
E-1420 Maximum Allowable Cable Length - Power and Control Circuits, Rev.1,
12/14/83
E-66
Single Line Meter and Relay Diagram, MCC Load Tabulation,
Rev. 5, 4/26/83
E-159
Load Center SWGR-MCC FDR Bkrs. 440v, Rev. 27, 1/23/87
E-160
Safeguard Buses - 101 and 201, Safeguard Bus Feeders,
4Kv, Rev. 19, 1/3/85
E-162
Safeguard Buses - Load Center Transformer Bkrs. 4Kv,
Rev. 6, 12/14/82
E-163
Safeguard Buses - Load Center Transformer Bkrs. 4Kv,
Rev. 12, 1/7/85
E-164
Safeguard Buses - Generator Bkrs 4Kv, Rev. 19, 10/18/84
E-1
Single Line Diagram - Station, Rev. 13, 4/26/85
E-16
Single Line Meter and Relay Diagram, 4Kv Safeguard Power System,
Rev. 15, 8/1/85
E-29
Single Line Meter and Relay Diagram, 0214, D224, D234, D244,
Safeguard Load Centers, 440 volt, Rev. 10, 12/18/85
4.0 Reports
- Significant Deficiency Report No. 52 - Undervoltage Condition in Certain
Electrical Power and Control Circuits, 10/22/81
- Final Report on Undervoltage Problems in Certain Power and Control
Circuits for LGS Unit 1 and Common, 2/16/83
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5.0 Quality Records
PECO Audit Reports
GE Cable Installation (5/8 - 5/19/86)
Diesel Generator Control Panels (12/16 - 12/31/86)
Motor Control Center 20B224 (3/25 - 4/2/86)
Cable Pulling of PGCC Cables (2/13 - 2/20/87)
Material Control (11/13 - 11/20/85)
Electrical Cable Storage Program (7/10 - 7/31/86)
Control of Electrical Parts and Components (11/13 - 11/20/85)
Maintenance Action Records for In Storage Maintenance of "B" Emergency
Diesel Generator
6.0 Calculations
E-587
Cable Pulling Tension, 4/27/87
E-590
Cable Pulling Tension, 5/4/87
Units 1 and 2 Final Calculations Index
EE.350
Bechtel Computer Program Manual for Cable Tension Calculations.
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