ML20009E834
| ML20009E834 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 01/08/2020 |
| From: | Sam Graves NRC/RGN-IV/DRS/EB-2 |
| To: | Welsch J Pacific Gas & Electric Co |
| Taylor N | |
| References | |
| IR 2020011 | |
| Download: ML20009E834 (5) | |
See also: IR 05000275/2020011
Text
January 8, 2020
Mr. James M. Welsch
Senior Vice President, Generation
and Chief Nuclear Officer
Pacific Gas and Electric Company
P.O. Box 56
Mail Code 104/6
Avila Beach, CA 93424
SUBJECT:
DIABLO CANYON POWER PLANT, UNITS 1 AND 2 - NOTIFICATION
OF TEMPORARY INSTRUCTION INSPECTION (TI) 2515/194 (NRC
INSPECTION REPORT 05000275/2020011 AND 05000323/2020011)
AND REQUEST FOR INFORMATION
Dear Mr. Welsch:
On March 16, 2020, the U.S. Nuclear Regulatory Commission (NRC) will perform an
inspection in accordance with Temporary Instruction (TI) 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), Revision 0, at
Diablo Canyon Power Plant, Units 1 and 2. This inspection verifies that Diablo Canyon Power
Plant has appropriately implemented the Nuclear Energy Institute voluntary industry initiative
including updating licensing basis to reflect the need to protect against open phase conditions.
The lead inspector for this inspection is Sam Graves. We understand that our regulatory
contact for this inspection is Jeff Skov. If there are any questions about the inspection or the
material requested, please contact the lead inspector at 817-200-1102 or by e-mail
at Samuel.Graves@nrc.gov.
PAPERWORK REDUCTION ACT STATEMENT
This letter contains mandatory information collections that are subject to the Paperwork
Reduction Act of 1995 (44 U.S.C. 3501 et seq.). The Office of Management and Budget (OMB)
approved these information collections (approval number 3150-0011). Send comments
regarding this information collection to the Information Services Branch, Office of the Chief
Information Officer, Mail Stop: T6 A10M, U.S. Nuclear Regulatory Commission, Washington,
DC 20555-0001, or by e-mail to Infocollects.Resource@nrc.gov, and to the Desk Officer, Office
of Information and Regulatory Affairs, NEOB-10202, (3150-0011) Office of Management and
Budget, Washington, DC 20503.
Public Protection Notification
The NRC may not conduct nor sponsor, and a person is not required to respond to, a request
for information or an information collection requirement unless the requesting document
displays a currently valid OMB control number.
J. Welsch
2
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 10 CFR 2.390, Public Inspections, Exemptions, Requests for
Withholding.
Sincerely,
/RA/
Samuel T. Graves, Senior Reactor Inspector
Engineering Branch 2
Division of Reactor Safety
Docket Nos. 05000275 and 05000323
License Nos. DPR-80 and DPR-82
Enclosure:
TI 2515/194 Inspection Documentation Request
cc w/encl: Electronic Distribution
SUNSI Review: ADAMS: Non-Publicly Available Non-Sensitive Keyword:
By: STG Yes No
Publicly Available Sensitive NRC-002
OFFICE
SRI:EB2
NAME
SGraves
SIGNATURE
/RA/
DATE
1/08/2020
Enclosure
TI 2515/194 Inspection Documentation Request
Please provide the following documentation (Items 1 - 8) to the lead inspector prior to the onsite
inspection date, preferably no later than March 2, 2020. Whenever practical, please provide
copies electronically. Please provide an index of the requested documents which includes a
brief description of the document and the numerical heading associated with the request
(i.e., where it can be found in the list of documents requested).
Sam Graves, Senior Inspector
RIV/DRS/EB2
1600 E. Lamar Blvd.
Arlington, TX 76011
817-200-1102
samuel.graves@nrc.gov
1. Copies of any calculations, analyses, and/or test reports performed to support the
implementation of your open phase condition (OPC) solution. If, in your implementation,
OPCs are not detected and alarmed in the control room please include documentation that:
a. Demonstrates the OPC will not prevent functioning of important-to-safety SSCs; AND
b. Detection of an OPC will occur within a short period of time (e.g., 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />).
2. Copies of any modification packages, including 10 CFR 50.59 evaluations if performed,
used for or planned for the implementation of your OPC solution.
3. Copies of periodic maintenance, surveillance, setpoint calibration, and/or test procedures
implemented or planned, for your OPC solution.
4. Copies of your licensing basis changes to Updated Final Safety Analysis Report (UFSAR)
and/or Technical Specifications (TS), or equivalent, as applicable, which discuss the design
features and analyses related to the effects of, and protection for, any open phase condition
design vulnerability. If these documents have not been updated, provide documentation of
your plans to do so.
5. Copies of any procurement specifications and acceptance testing documents related to the
installation of your OPC solution.
6. Copies of any site training the inspector will need to accomplish to gain access to areas
with, or planned, major electrical equipment used in your OPC solution (i.e. switchyard).
7. Provide documentation showing that with an OPC occurrence and no accident condition
signal present, either:
a. An OPC does not adversely affect the function of important-to-safety SSCs, OR
b. TS LCOs are maintained, or the TS actions are met without entry into TS LCO 3.0.3
AND
i.
Important-to-safety equipment is not damaged by the OPC, AND
ii.
Shutdown safety is not compromised
2
8. With OPC occurrence and an accident condition signal present:
a. Provide documentation showing that automatic detection and actuation will transfer
loads required to mitigate postulated accidents to an alternate source and ensure
that safety functions are preserved, as required by the current licensing bases, OR
b. Provide documentation showing that all design basis accident acceptance criteria are
met with the OPC, given other plant design features. Accident assumptions must
include licensing provisions associated with single failures. Typically, licensing
bases will not permit consideration of the OPC as the single failure since this failure
is a non-safety system.
Please provide the following documentation to the inspector when onsite. Whenever practical,
please provide copies electronically, except for drawings. Drawings should be provided as
paper copies of sufficient size (ANSI C or D) such that all details are legible.
9. A brief presentation describing your electric power system design and typical electrical
transmission and distribution system alignments; OPC design schemes installed to detect,
alarm and actuate; bus transfer schemes; and maintenance and surveillance requirements.
This presentation should be a general overview of your system. Please schedule the
overview shortly after the entrance meeting.
10. Plant layout and equipment drawings for areas that identify: (a) the physical plant locations
of major electrical equipment used in your open phase condition solution; (b) the locations of
detection and indication equipment used in the open phase condition sensing circuits.
11. If OPC actuation circuits are required, provide documentation that demonstrates continued
coordination with the other protective devices in both the offsite electrical system (within
Diablo Canyons area of responsibility) and the onsite electrical systems.
12. Access to locations in which open phase condition equipment is installed or planned
(i.e. switchyard, etc.)
13. Copies of documentation or testing that demonstrates your OPC solution minimizes spurious
actuation or misoperation in the range of voltage imbalance normally expected in the
transmission system that could cause undesired separation from an operable off-site power
source.