ML20077L169
| ML20077L169 | |
| Person / Time | |
|---|---|
| Site: | Salem  (DPR-070, DPR-075) |
| Issue date: | 03/20/2020 |
| From: | Glenn Dentel NRC Region 1 |
| To: | Carr E Public Service Enterprise Group |
| References | |
| IR 2020010 | |
| Download: ML20077L169 (10) | |
See also: IR 05000272/2020010
Text
March 20, 2020
Mr. Eric Carr
President and Chief Nuclear Officer
P. O. Box 236
Hancock's Bridge, NJ 08038
SUBJECT:
SALEM NUCLEAR GENERATING STATION, UNITS 1 AND 2 - TEMPORARY
INSTRUCTION 2515/194 REPORT 05000272/2020010 AND 05000311/2020010
Dear Mr. Carr:
On March 5, 2020, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at
Salem Nuclear Generating Station, Units 1 and 2 and discussed the results of this inspection
with Mr. David Sharbaugh, Plant Manager and other members of your staff. The results of this
inspection are documented in the enclosed report.
No findings or violations of more than minor significance were identified during this inspection.
This letter, its enclosure, and your response (if any) will be made available for public inspection
and copying at http://www.nrc.gov/reading-rm/adams.html and at the NRC Public Document
Room in accordance with Title 10 of the Code of Federal Regulations 2.390, Public
Inspections, Exemptions, Requests for Withholding.
Sincerely,
X /RA/
Signed by: Glenn T. Dentel
Glenn T. Dentel, Chief
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 05000272 and 05000311
License Nos. DPR-70 and DPR-75
Enclosure:
As stated
cc w/ encl: Distribution via LISTSERV
SUNSI Review
Non-Sensitive
Sensitive
Publicly Available
Non-Publicly Available
OFFICE RI/DRS
RI/DRP
RI//DRS
NAME
CHobbs per email
BBickett
GDentel
DATE
3/18/20
3/19/20
3/20/20
Enclosure
U.S. NUCLEAR REGULATORY COMMISSION
Inspection Report
Docket Numbers:
05000272 and 05000311
License Numbers:
Report Numbers:
05000272/2020010 and 05000311/2020010
Enterprise Identifier: I-2020-010-0011
Licensee:
Facility:
Salem Nuclear Generating Station, Units 1 and 2
Location:
Hancock's Bridge, NJ 08038
Inspection Dates:
March 2, 2020 to March 5, 2020
Inspectors:
C. Hobbs, Reactor Inspector
J. Patel, Senior Resident Inspector
Approved By:
Glenn T. Dentel, Chief
Engineering Branch 2
Division of Reactor Safety
2
SUMMARY
The U.S. Nuclear Regulatory Commission (NRC) continued monitoring the licensees
performance by conducting a Temporary Instruction 2515/194 at Salem Nuclear Generating
Station, Units 1 and 2, in accordance with the Reactor Oversight Process. The Reactor
Oversight Process is the NRCs program for overseeing the safe operation of commercial
nuclear power reactors. Refer to https://www.nrc.gov/reactors/operating/oversight.html for more
information.
List of Findings and Violations
No findings or violations of more than minor significance were identified.
Additional Tracking Items
None.
3
INSPECTION SCOPES
Inspections were conducted using the appropriate portions of the inspection procedures (IPs) in
effect at the beginning of the inspection unless otherwise noted. Currently approved IPs with
their attached revision histories are located on the public website at http://www.nrc.gov/reading-
rm/doc-collections/insp-manual/inspection-procedure/index.html. Samples were declared
complete when the IP requirements most appropriate to the inspection activity were met
consistent with Inspection Manual Chapter (IMC) 2515, Light-Water Reactor Inspection
Program - Operations Phase. The inspectors reviewed selected procedures and records,
observed activities, and interviewed personnel to assess licensee performance and compliance
with Commission rules and regulations, license conditions, site procedures, and standards.
OTHER ACTIVITIES - TEMPORARY INSTRUCTIONS, INFREQUENT AND ABNORMAL
2515/194 - Inspection of the Licensees Implementation of Industry Initiative Associated with the
Open Phase Condition Design Vulnerabilities in Electric Power Systems (NRC Bulletin 2012-01)
The inspectors reviewed the licensees implementation of the Nuclear Energy Institute
Voluntary Industry Initiative, (ADAMS Accession No. ML15075A454) dated March 16,
2015. This included reviewing how the licensee updated their licensing basis to reflect the need
to protect against open phase conditions.
Inspection of the Licensees Implementation of Industry Initiative Associated with the Open
Phase Condition Design Vulnerabilities in Electric Power Systems (NRC Bulletin 2012-01)
(1 Sample)
(1)
Salem Unit 1 and Unit 2 electrical power distribution system is divided into three
voltage levels: 500 kV, 13 kV, and 4kV. The offsite electrical power system consists
of the 500 kV and 13 kV voltage levels which are contained inside the Salem
switchyard, while the onsite electrical power distribution system begins at the 4 kV
voltage level, outside of the Salem switchyard. Electrical power enters the Salem
switchyard at the 500 kV system which consists of a 500 kV ring bus with two
seperate offsite power transmission lines supplying power to different sections of the
500 kV ring bus. In addition, there is a third connection which is an inter-tie to the
Hope Creek 500 kV switchyard that is normally open. The 500 kV ring bus supplies
power to four Station Power Transformers (SPTs) which step the voltage down to
13 kV. Normal configuration is SPT 1 and 2 supply 13 kV power to the North 13 kV
Bus, while SPT 3 and 4 supply 13 kV power to the South 13 kV Bus. The North 13
kV Bus supplies power to SPTs 11, 12, 21, and 22 which step the voltage down to 4
kV. SPTs 11, 12, 21, and 22 supply alternate power to eight non-vital 4 kV buses
called group buses. Salem Unit 1 group non-vital buses are supplied by SPTs 11 and
12, while Salem Unit 2 group non-vital buses are supplied by SPTs 21 and 22. The
group buses are normally powered by Auxiliary Power Transformers (APTs) 1 and 2
which are powered from Salem Unit 1 main generator and Salem Unit 2 main
generator when their respective reactors are at power. During a reactor trip, power to
the non-vital 4 kV group buses will be automatically transferred to SPTs 11 and 12 for
Salem Unit 1, and SPTs 21, and 22 for Salem Unit 2.
The South 13 kV Bus supplies power to SPTs 13, 14, 23, and 24. Each Salem unit
has three vital 4kV buses that supply power to Engineered Safeguard Features
(ESFs) 480 V loads. SPTs 13 and 14 supply power to Salem Unit 1, 4 kV vital buses,
4
while SPTs 23 and 24 supply power to Salem Unit 2, 4 kV vital buses. Normal
configuration is to have one SPT carry the load for two 4 kV vital buses, while the
other SPT carries the load for one 4 kV vital bus. In the event both SPTs are lost or
degraded to a vital 4 kV bus, each 4 kV vital bus has its own respective standby
diesel generator that will start and synchronize onto its respective 4 kV vital bus,
automatically within 13 seconds. Only two vital 4 kV buses are required to shutdown
an individual Salem unit. The third 4 kV vital bus on each Salem unit is for
redundancy.
The Open Phase Protection (OPP) system utilized at Salem consists of a hybrid
design with protection at both the 500 kV level and additional protection at the 13 kV
level. At the 500 kV level, the OPP system utilizes the Power Systems Sentinel
Technologies, LLC (PSSTech) design. This design consists of a neutral current
injection method, in which a small neutral current is injected to the primary (high) side
neutral bushing. Changes in the neutral impedance are then monitored to determine
if an open phase condition exists. This method of protection is designed to work in
both high and low transformer loading conditions. At Salem Nuclear Generating
Station, each PSSTech system control cabinet contains single channel protection,
with one Schweitzer Engineering Laboratories (SEL) protection relay. One PSSTech
system control cabinet is installed at each of the four 500 kV transformers (SPTs 1, 2,
3, and 4) in the Salem switchyard. The active trip capability on each control cabinet
would open the upstream 500 kV switchyard breaker supplying power to that 500 kV
SPT in the event an Open Phase Condition (OPC) was detected. The PSSTech
system was functioning in alarm only mode at the time of inspection, with the active
trip feature disabled by hand switch on the front of the control cabinet.
At the 13 kV level, OPP is provided by SEL-751 multifunction negative sequence
relays (59Q) that monitor vital 4 kV bus infeed through potential transformers. Eight
relays total, four for each Salem Unit are installed. Each SPT feeding power to 4 kV
vital buses, has two 59Q relays installed that utilize a two out of two coincidence logic
to prevent spurious trips of the system. Relay settings have been adjusted to account
for normal system grid imbalance. In the event an OPC was detected at the 13 kV
level, the 13 kV infeed breakers to their respective SPTs would trip open. This would
be STPs 13 and 14 for Salem Unit 1, and SPTs 23 and 24 for Salem Unit 2. This
would be accomplished by activation of the SPT lockout relay. At the time of the
inspection, the SEL-751 relays were operating in alarm mode only, with the active trip
feature disabled by opening knife switches located next to the relays.
INSPECTION RESULTS
Detection, Alarms, General, and Protective Actions Criteria
2515/194
Based on discussion with PSEG staff, review of design and testing documentation, and
walkdowns of installed equipment, the inspectors had reasonable assurance that PSEG is
appropriately implementing, with noted exceptions discussed below, the Voluntary Industry
Initiative at Salem Nuclear Generating Station. The inspectors determined that:
03.01(a)(1) Open Phase Conditions are detected and alarmed in the main control room for
both Salem units.
03.01(a)(2) Open Phase Condition detection circuits are sensitive enough to identify an OPC
for all credited transformer loading conditions (high and low loading). In addition, enhanced
5
monitoring criteria have been proceduralized for taking an OPP PSST panel out of service, as
well as for non-functional SEL-751 relays.
03.01(a)(3) Open Phase Condition design schemes minimize misoperation and spurious
operation in the range of voltage unbalance normally expected in the transmission system.
Misoperation and spurious operation have been accounted for in calculation, implemented
through protective relay settings, and utilization of coincidence logic at the 13 kV level of the
system.
03.01(a)(4) No Class-1E circuits were replaced with non-Class-1E circuits during the
implementation of the OPC modification.
03.01(a)(5) The Salem Unit 1 and Unit 2 UFSAR was updated to discuss the design features
and protection schemes for the OPP system under UFSAR change notice 17-015.
03.01(b)(1) Salem Unit 1 and Unit 2 have determined that an OPC is a credible failure and
have installed an Open Phase Protection system for both units.
03.01(b)(2) With an OPC occurence and no accident condition signal present, an OPC will
not adversely affect the function of important-to-safety SSCs. The OPP system at Salem
Units 1 and 2 is designed to actuate an existing transformer lockout relay at both the 500 kV
and 13 kV level if the active trip feature of the system is enabled. The trip function, if
enabled, would provide an additional input to the associated transformer lockout relays,
however, the credited plant response is unaffected and will be the same regardless of the
conditions that generated the lockout of the transformer.
No findings were identified.
Protective Actions Exceptions
2515/194
03.01(b)(3) With an OPC occurrence and an accident condition signal present, the inspectors
could not verify that automatic detection and actuation will transfer loads as required to
mitigate postulated accidents to an alternate source and ensure safety functions are
preserved. At the time of the inspection, the OPP system at Salem Units 1 and 2 was
operating in alarm mode only with the active trip features of the system disabled. Alarm
response procedures are in place to have operators manually separate either unit from offsite
power if it is determined that an OPC exists. The OPP system was still in the 24 month
monitoring period described in the Nuclear Energy Institute (NEI) Voluntary Industry Initiative
(VII). The monitoring period is scheduled to end in December 2020, at which time the station
will decide to enable active trip features of the system or adopt the risk informed operator
manual action methodology described in NEI technical report 19-02. This exception was
documented in NOTF 20846122.
03.01(b)(4) Periodic tests, calibrations, and setpoint verifications had not been established for
the OPP system at the time of the inspection. This exception was identified in the station self
assessment conducted prior to the start of the inspection and documented in NOTFs
20845339 and 20846123.
6
EXIT MEETINGS AND DEBRIEFS
The inspectors verified no proprietary information was retained or documented in this report.
On March 5, 2020, the inspectors presented the Temporary Instruction 2515/194 results
to Mr. David Sharbaugh, Plant Manager and other members of the licensee staff.
7
DOCUMENTS REVIEWED
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
2515/194
Calculations
Salem Open Phase Protection Analysis
0
ES-15.022(Q)
Salem 1E Motor Operability Analysis for Unbalanced Loads
0
Corrective Action
Documents
NOTFs
20825396,
20828253,
20828254,
2028256
Corrective Action
Documents
Resulting from
Inspection
NOTFs
20845339,
20846122,
20846123
Drawings
203000 S 8789-
67
Salem Unit 1 & Unit 2 One Line Diagram - Generators &
67
203000-SIMP-3
Salem Unit 1 & Unit 2 One Line Diagram - Salem 500 kV - 4
kV Electrical Distribution
3
203002 A 8789-
37
Salem Unit 1 One Line Diagram - 4160V Vital Buses
37
208625 S 1000-
39
Salem Unit 1 & Unit 2 One Line Diagram - 500 kV Switchyard 39
Engineering
Changes
SCN 17-015
Salem Units 1 & 2 UFSAR change notice for Open Phase
Condition protection system
11/16/17
Engineering
Evaluations
DCP 80119154
50.59 Review Salem Unit 1 Open Phase Protection
0
DCP 80119205
50.59 Review Salem Unit 2 Open Phase Protection
0
Procedures
S1.OP-DL.ZZ-
0002(Q)
Salem Unit 1 Control Room Log Modes 5, 6, and Defueled
52
S1.OP-DL.ZZ-
0003(Q)
Salem Unit 1 Control Room Log Modes 1 - 4
92
S1.OP-ST.500-
0001(Q)
Salem Unit 1 - Electrical Power Systems AC Sources
Alignment
16
S1.OP.AR.ZZ-
0010(Q)
Salem Unit 1 - Alarm K-45 - Open Phase
47
S2.OP-AR.ZZ-
Salem Unit 2 - Alarm K-45 - Open Phase
36
8
Inspection
Procedure
Type
Designation
Description or Title
Revision or
Date
0010(Q)
S2.OP-DL.ZZ-
0002(Q)
Salem Unit 2 Control Room Log - Modes 5, 6, and Defueled
50
S2.OP-DL.ZZ-
0003(Q)
Salem Unit 2 Control Room Log Modes 1 - 4
116
S2.OP-ST.500-
0001(Q)
Salem Unit 2 - Electrical Power Systems AC Sources
Alignment
14
SC.OP-DL.ZZ-
007(Z)
Electrical Equipment Log
17