1. Diablo Canyon Power Plant: State of the Plant Update
4/15/2018
Diablo Canyon Power Plant:
State of the Plant Update
Paula Gerfen
Station Director
October 20, 2016

2. Overview
Station Update Upcoming Key Station Activities

3. Station Update Plant Operation
Unit 2 is safely operating at 100 percent power with Probabilistic Risk Assessments (PRAs) of “Green.”
Unit 1 is currently curtailed at 50 percent power for a planned tunnel cleaning
All NRC Performance Indicators (PIs) are “Green.”
2016 Generation Capacity Factor (year to date)
Unit 1 = 102.1%
Unit 2 = 88.1%  
Total Plant = 95.1%  

4. Station Update Plant Operation
Unit 2 curtailed to 75 percent power during performance of STP R-1A to resolve a misaligned control rod
Unit 2 went off-line for 2R19 Refueling Outage May 2016   

5. Current Continuous Days On-line DAILY LOAD PROFILE (% MDC Net)
Generation History – Capacity Factor:
Past 4 Months
2016 %
U-1
Unit 1 COD
Unit YTD
Capacity
Factor %
Total Plant 2016 YTD
Capacity Factor
95.09%
JUNE
JULY
AUGUST
SEPTEMBER
U-2 %
Unit 2 COD
08/04 11:37 Manual curtailment to 75% during STP R-1A to resolve misaligned control rod.
Unit YTD
Capacity
Factor %
2R19 Refueling Outage 5/1/16 – 6/2/ Days
06/02 14:47 Paralleled to the grid.
06/08 04:03 Full power on the grid.
Current Continuous Days On-line
Unit-1 = Unit-2 = 120.4
DAILY LOAD PROFILE (% MDC Net)
Through: SEP 2016
Source: Accenture Experience (Utility companies of various sizes in North America) 7

6. Current Continuous Days On-line DAILY LOAD PROFILE (% MDC Net)
Generation History – Capacity Factor:
Past 12 Months
2015
2016 %
U-1
Unit 1 COD
12/11 16:30 Curtailed to 25% to clean debris from Intake and Main Condenser due to high seas.
04/22 10:01 Curtailed to 88% for STP M-21C Main Steam Isolation Valve Testing.
10/04 00:01 Commenced 1R19 Refueling.
Unit YTD
Capacity
Factor %
1R19 Refueling Outage 10/04/15 – 11/07/15 Actual 35 Days
11/07 23:21 Paralleled to the grid.
11/12 18:38 Full power on the grid.
Total Plant 2016 YTD
Capacity Factor
95.09%
JUL
AUG
SEP
OCT
NOV
DEC
JAN
FEB
MAR
APR
MAY
JUN
U-2 %
Unit 2 COD
12/11 23:43 Curtailed to 25% to clean debris from Intake and Main Condenser due to high seas.
04/30 14:58 Commenced ramp-down to begin 2R19 Refueling Outage.
08/04 11:37 Manual curtailment to 75% during STP R-1A to resolve misaligned control rod.
Unit YTD
Capacity
Factor %
05/01 00:01 Commenced 2R19 Refueling.
06/02 14:47 Paralleled to the grid.
06/08 04:03 Full power on the grid.
2R19 Refueling Outage 5/1/16 – 6/2/ Days
Current Continuous Days On-line
Unit-1 = Unit-2 = 120.4
DAILY LOAD PROFILE (% MDC Net)
Through: SEP 2016
Source: Accenture Experience (Utility companies of various sizes in North America) 7

7. Station Update Completed 2R19 Refueling Outage
Highlights of work performed:
Replaced “C” Low Pressure Turbine
Replaced 500kV Turbine building standoff insulators
Upgraded Intake travelling screens
New seals on all Reactor Coolant Pumps (RCP) – design to support FLEX, NFPA 805 and risk managed Tech Specs
Replaced RCP 2-1 rotor and stator
RCP year maintenance
Modification to the Hot Shut Down Panel for NFPA 805 completed
Core Barrel 10 year inspection
NFPA 805 HSDP modifications and CFCU 2-5 cooler replacement
Reactor coolant pump Thermal Seals – all 4
Reactor coolant pump 2-1 motor overhaul
Reactor Vessel inspections
RCCA guide card inspection
500 kV disconnect switch replacements
Replace 500 kV dead end insulators
230 kV switchyard cold wash
Vital battery and DC distribution panel 2-3 replacement
480 V vital bus H breaker replacements
"C" LP turbine replacement
11 feedwater heater inspections
Steam Generator sludge lance, and FOSAR
5 intake travelling screen overhauls

8. Station Update 1R20 Implementation
Baffle Bolting: Baffle bolt damage found at other plants
Unit 1 – Visual inspection 1R18
No indications or problems
Full ultrasonic testing 1R20
Planning for the replacement of approximately 120 bolts during 1R20
Unit 2 is not susceptible – bolt material, up flow modification
This is a known industry issue
The Outage Management Team has discussed the Scope, Schedule, and Cost of 1R20 based upon the implementation of the Reactor Cavity Seal and the inspection and possible replacement of some Core Barrel Baffle Bolting.  Based on reviewing a number of options a baseline duration of 65 Days is needed to safely and methodically implement an outage of this complexity.  This duration is based on the assumption that the station will replace approximately 150 bolts in an 18 day window. 

9. Upcoming Station Activities Preview
NRC Triennial Fire Inspection October 2016
NRC Radiation Safety Inspection October 2016
NRC Initial Operator Exams October 2016
NRC EP Performance/Exercise Inspection November 2016
NRC Security Access Control Inspection February 2017
NRC Biennial Requal Inspection April 2017
1R20 Refueling Outage April 2017
Source: Accenture Experience (Utility companies of various sizes in North America)

10. Thank you
Paula Gerfen 10