IR 05000498/2013003
| ML13211A436 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 07/30/2013 |
| From: | Webb Patricia Walker NRC/RGN-IV/DRP/RPB-A |
| To: | Koehl D South Texas |
| Walker W | |
| References | |
| IR-13-003 | |
| Download: ML13211A436 (53) | |
Text
July 30, 2013 Mr. Dennis Koehl President and Chief Executive Officer STP Nuclear Operating Company P.O. Box 289 Wadsworth, TX 77483 Subject: SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION
- NRC INTEGRATED INSPECTION REPORT 05000 498/20 13 00 3 AND 05000499/20 13003
Dear Mr. Koehl:
On June 29, 2013, the U.S. Nuclear Regulatory Commission (NRC) completed an inspection at your South Texas Project Electric Generating Station, Units 1 and 2, facility. The enclosed inspection report documents the inspection results which were discussed on July 3, 2013 , with you and other members of your staff.
The inspections examined activities conducted under your license as they relate to safety and compliance with the Commission's rules and regulations and with the conditions of your license. The inspectors reviewed selected procedures and records, observed activities, and interviewed personnel.
One NRC-identified finding of very low safety significance (Green) was identified during this inspection.
The finding did not involve a violation of NRC requirements.
In accordance with 10 CFR 2.390 of the NRC'
s "Rules of Practice," a copy of this letter, its enclosure, and your response (if any) will be available electronically for public inspection in the NRC Public Document Room or from the Publicly Available Records (PARS) component of NRC's Agencywide Document Access and Management System (ADAMS).
ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).
Sincerely,
/RA/ Wayne C. Walker , Branch Chief Project Branch A Division of Reactor Projects U N I T E D S T A T E S N U C L E A R R E G U L A T O R Y C O M M I S S I O N R E G I O N I V1600 EAST LAMAR BLVD A R L I N G T O N , T E X A S 7 6 0 1 1-4511 Docket Nos.: 0 50 00 498, 05000499 License No s.: NPF-76, NPF-80 Enclosure:
Inspection Report 05000 498/2013003 and 05000 499/2013003 w/Attachment 1: Supplemental Information w/Attachment 2: Document Request for Occupational Radiation Safety Inspection
SUMMARY OF FINDINGS
IR 05000 498/20 13003 , 05000 499/20 13003; 03/31/2013
- 06/29/2013
- South Texas Project Electric Generating Station, Units 1 and 2
, Integrated Resident and Regional Report;
Operability Evaluations and Functionality Assessments.
The report covered a 3
-month period of inspection by resident inspectors and announced baseline inspections by region-based inspectors.
The significance of most findings is indicated by their color (Green, White, Yellow, or Red) using Inspection Manual Chapter 0609, "Significance Determination Process." The cross-cutting aspect is determined using Inspection Manual Chapter 0310, "Components Within the Cross-Cutting Areas." Findings for which the significance determination process does not apply may be Green or be assigned a severity level after NRC management review. The NRC
's program for overseeing the safe operation of commercial nuclear power reactors is described in NUREG
-1649, "Reactor Oversight Process," Revision 4, dated December 2006.
A. NRC-Identified Findings and Self-Revealing Findings
Cornerstone: Barrier Integrity
- Green.
The inspectors identified a Green finding for the licensee's failure to follow Procedure 0PGP04
-ZA-0307, "Preparation of Calculations," Revision 4. Specifically
, two parts were not followed, step 3.1.5.4 states all design calculations SHALL be identified AND their sources indicated by providing an adequate title/description; and step 3.2.2 which instructs performing a peer check review of the calculation for completeness, clarity, and accuracy.
As part of a routine walkdown of the spent fuel pool area, the inspectors identified several issues of concern regarding the licensee's spent fuel pool mitigation strategy equipment which implements the fill and/or spray strategy. Specifically, the as-designed equipment did not match the as-installed configuration and the as-designed calculations did not account for standard engineering practices to ensure that all calculation considerations were taken into account. The licensee captured these issues in Condition Reports 13
-3767 and 13
-5006. Corrective actions included updating the calculations to include standard engineering practices and ensuring that the design matched the as-installed configuration.
The failure to follow Procedure 0PGP04
-ZA-0307 to ensure an adequate design calculation and review for accuracy was a performance deficiency. This finding was more than minor because it adversely affected the design control attribute of the Barrier Integrity cornerstone and affected the cornerstone objective to provide reasonable assurance that physical design barriers such as fuel cladding protect the public from radionuclide releases caused by accidents or events. The inspectors performed the significance determination process using NRC Inspection Manual Chapter 0609, Attachment 4, "Initial Characterization of Findings," which evaluates the finding using Appendix L, "B.5.b Significance Determination Process", "Table 2
- Significance Characterization," and determined the finding was of very low safety significance because the finding did not result in an unrecoverable mitigating strategy due to the unavailability of post-accident cooling systems for the spent fuel pool. No cross-cutting aspects are assigned to this finding because the calculations were performed in 2007 and 2008 and are not considered indicative of current performance (Section 1R15).
B. Licensee-Identified Violations
None
REPORT DETAILS
Summary of Plant Status
Unit 1 began the inspection period at 100 percent rated thermal power and remained there until May 10, 2013, when the plant shut down for Reliability Outage 1P1301 to work on the main generator stator cooling water system. On May 15, 2013, Unit 1 commenced a reactor startup and reached 100 percent rated thermal power on May 17, 2013.
Unit 2 began the inspection period in Forced Outage 2F1302 as a result of a fire in main transformer 2A , which resulted in an automatic reactor trip.
On April 12, 2013, Unit 2 commenced a reactor startup and achieved Mode 1. While at approximately 10 percent rated thermal power
, the licensee performed post
-maintenance testing on the main turbine. During the testing
, main turbine bearing number 2 temperature spiked causing control room alarms, and resulted in operators initiating a manual turbine trip. Based on indications of bearing damage , the licensee cooled the reactor coolant system back down to Mode 5 on April 14, 2013 , to repair bearing number 2. On April 19, 2013, Unit 2 commenced a reactor startu p , achieved Mode 1 on April 20, 2013, and reached 100 percent rated thermal power on April 23, 2013
REACTOR SAFETY
Cornerstones: Initiating Events, Mitigating Systems, and Barrier Integrity
1R01 Adverse Weather Protection
.1 Summer Readiness for Offsite and Alternate
-AC Power Systems
a. Inspection Scope
The inspectors performed a review of preparations for summer weather for selected systems, including conditions that could lead to loss
-of-offsite power and conditions that could result from high temperatures. The inspectors reviewed the procedures affecting these areas and the communications protocols between the transmission system operator and the plant to verify that the appropriate information was being exchanged when issues arose that could affect the offsite power system. Examples of aspects considered in the inspectors' review included:
The coordination between the transmission system operator and the plant
's operations personnel during off
-normal or emergency events The explanations for the events The estimates of when the offsite power system would be returned to a normal state The notifications from the transmission system operator to the plant when the offsite power system was returned to normal During the inspection, the inspectors focused on plant-specific design features and the procedures used by plant personnel to mitigate or respond to adverse weather conditions. Additionally, the inspectors reviewed the UFSAR and performance requirements for systems selected for inspection
, and verified that operator actions were appropriate as specified by plant-specific procedures. Specific documents reviewed during this inspection are listed in the attachment. The inspectors also reviewed corrective action program items to verify that the licensee was identifying adverse weather issues at an appropriate threshold and entering them into their corrective action program in accordance with station corrective action procedures.
The inspectors' reviews focused specifically on the following plant systems:
On May 3, 201 3, the inspectors completed a review of the offsite and onsite power systems
, including the Units 1 and 2 engineered safety features transformers
- auxiliary transformers
- and standby transformers. Inspectors also completed walkdowns of the switchyard and reviewed the return
-to-service plan of action for main transformer 2A after Forced Outage 2F1302.
These activities constitute completion of one sample to evaluate the readiness of offsite and alternate
-ac power for summer weather, as defined in Inspection Procedure 71111.01-05.
b. Findings
No findings were identified.
.2 Readiness to Cope with External Flooding
a. Inspection Scope
On June 10, 2013, the inspectors evaluated the design, material condition, and procedures for coping with the design basis probable maximum flood. The evaluation included a review to check for deviations from the descriptions provided in the UFSAR for features intended to mitigate the potential for flooding from external factors. As par t of this evaluation, the inspectors checked for obstructions that could prevent draining, checked that the roofs did not contain obvious loose items that could clog drains in the event of heavy precipitation, and determined that barriers required to mitigate the flood were in place and operable. Additionally, the inspectors performed a n inspection of the protected area to identify any modification to the site that would inhibit site drainage during a probable maximum precipitation event or allow water ingress past a barrier. The inspectors also reviewed the abnormal operating procedure for mitigating the design basis flood to ensure it could be implemented as written. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of one external flooding sample
, as defined in Inspection Procedure 71111.01-05.
b. Findings
No findings were identified.
1R04 Equipment Alignment
.1 Partial Walkdown
a. Inspection Scope
The inspectors performed partial system walkdowns of the following risk
-significant systems: April 30, 2013, Unit 2, auxiliary feedwater system train C May 31, 2013, Unit 2
, auxiliary feedwater system train A June 14, 2013, Unit 1, component cooling water system train B The inspectors selected these systems based on their risk significance relative to the reactor safety cornerstones at the time they were inspected. The inspectors attempted to identify any discrepancies that could affect the function of the system, and, therefore, potentially increase risk. The inspectors reviewed applicable operating procedures, system diagrams, UFSAR, technical specification requirements, administrative technical specification s, outstanding work orders, condition reports, and the impact of ongoing work activities on redundant trains of equipment in order to identify conditions that could have rendered the systems incapable of performing their intended functions. The inspectors also inspected accessible portions of the systems to verify system components and support equipment were aligned correctly and operable. The inspectors examined the material condition of the components and observed operating parameters of equipment to verify that there were no obvious deficiencies. The inspectors also verified that the licensee had properly identified and resolved equipment alignment problems that could cause initiating events or impact the capability of mitigating systems or barriers and entered them into the corrective action program with the appropriate significance characterization. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of three partial system walkdown sample s , as defined in Inspection Procedure 71111.04-05. b. Finding s No findings were identified.
.2 Complete Walkdown
a. Inspection Scope
On May 30, 2013, the inspectors performed a complete system alignment inspection of the Unit 2 essential cooling water system train C , to verify the functional capability of the system. The inspectors selected this system based on risk
-informed insights from site-specific risk studies together with other factors such as engineering analysis and judgment , operating experience
, performance history
, current plant mode
, and/or previous walkdowns. The inspectors inspected the system to review mechanical and electrical equipment line ups, electrical power availability, system pressure and temperature indications, as appropriate, component labeling, component lubrication, component and equipment cooling, hangers and supports, operability of support systems, and to ensure that ancillary equipment or debris did not interfere with equipment operation. The inspectors reviewed a sample of past and outstanding work orders to determine whether any deficiencies significantly affected the system function. In addition, the inspectors reviewed the corrective action program database to ensure that system equipment
-alignment problems were being identified and appropriately resolved. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of one complete system walkdown sample
, as defined in Inspection Procedure 71111.04-05.
b. Findings
No findings were identified.
1R05 Fire Protection
Quarterly Fire Inspection Tours
a. Inspection Scope
The inspectors conducted fire protection walkdowns that were focused on availability, accessibility, and the condition of firefighting equipment in the following risk
-significant plant areas:
May 31, 2013, Unit 2, diesel generator building train C, Fire Zone Z500 June 4, 2013, Unit 2
, electrical auxiliary building
, engineered safety features switchgear room train B
, Fire Zone Z 042 June 10, 2013, Unit 2, electrical auxiliary building, channel 1 battery room and channel 1 distribution room
, Fire Zones Z084 and Z003 June 17, 2013, Unit 1, mechanical auxiliary building, component cooling water pump and chiller train s A, B, and C , Fire Zones Z128, Z140, and Z139 The inspectors reviewed areas to assess if licensee personnel had implemented a fire protection program that adequately controlled combustibles and ignition sources within the plant; effectively maintained fire detection and suppression capability; maintained passive fire protection features in good material condition; and had implemented adequate compensatory measures for out of service, degraded or inoperable fire protection equipment, systems, or features, in accordance with the licensee's fire plan.
The inspectors selected fire areas based on their overall contribution to internal fire risk as documented in the plant's Individual Plant Examination of External Events with later additional insights, their potential to affect equipment that could initiate or mitigate a plant transient, or their impact on the plant's ability to respond to a security event. Using the documents listed in the attachment, the inspectors verified that fire hoses and extinguishers were in their designated locations and available for immediate use; that fire detectors and sprinklers were unobstructed
- that transient material loading was within the analyzed limits; and fire doors, dampers, and penetration seals appeared to be in satisfactory condition. The inspectors also verified that minor issues identified during the inspection were entered into the licensee's corrective action program
. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of four quarterly fire
-protection inspection sample s , as defined in Inspection Procedure 71111.05-05.
b. Findings
No findings were identified.
1R06 Flood Protection Measures
a. Inspection Scope
The inspectors reviewed the UFSAR, the flooding analysis, and plant procedures to assess susceptibilities involving internal flooding; reviewed the corrective action program to determine if licensee personnel identified and corrected flooding problems; inspected underground bunkers/manholes to verify the adequacy of sump pumps, level alarm circuits, cable splices subject to submergence, and drainage for bunkers/manholes; and verified that operator actions for coping with flooding can reasonably achieve the desired outcomes. The inspectors also inspected the areas listed below to verify the adequacy of equipment seals located below the flood line, floor and wall penetration seals, watertight door seals, common drain lines and sumps, sump pumps, level alarms, and control circuits, and temporary or removable flood barriers.
Specific documents reviewed during this inspection are listed in the attachment.
April 22, 2013, Units 1 and 2, safety
-related underground manhole inspections May 22, 2013, Units 1 and 2, auxiliary feedwater pump isolation valve cubicles These activities constitute completion of one flood protection measures inspection sample and one bunker/manhole sample
, as defined in Inspection Procedure 71111.06-05.
b. Findings
No findings were identified.
R11 Licensed Operator Requalification Program and Licensed Operator Performance (71111.11)
.1 Quarterly Review of Licensed Operator Requalification Prog
r am
a. Inspection Scope
On June 17 and 20, 2013, the inspectors observed a crew of licensed operators in the plant's simulator during requalification testing. The inspectors assessed the following areas: Licensed operator performance The ability of the licensee to administer the evaluations The quality of post
-scenario critiques These activities constitute completion of one quarterly licensed
-operator requalification program sample
, as defined in Inspection Procedure 71111.11.
b. Findings
No findings were identified.
.2 Quarterly Observation of Licensed Operator Performance
a. Inspection Scope
On April 12, 2013, the inspectors observed the performance of on
-shift licensed operators in the plant
's main control room. At the time of the observations, the plant was in a period of heightened activity and risk due to commencing a reactor startup
. In addition, the inspectors assessed the operators' adherence to plant procedures, including reactor startup; plant startup to 100 percent; secondary startup; operations conduct of operations; and other operations department policies.
These activities constitute completion of one quarterly licensed
-operator performance sample , as defined in Inspection Procedure 71111.11.
b. Findings
No findings were identified.
1R12 Maintenance Effectiveness
a. Inspection Scope
The inspectors evaluated degraded performance issues involving the following risk-significant system:
May 9, 2013, Units 1 and 2, solid state protection system The inspectors reviewed events such as where ineffective equipment maintenance has resulted in valid or invalid automatic actuations of engineered safeguards systems and independently verified the licensee
's actions to address system performance or condition problems in terms of the following:
Implementing appropriate work practices Identifying and addressing common cause failures Scoping of systems in accordance with 10 CFR 50.65(b)
Characterizing system reliability issues for performance Charging unavailability for performance Trending key parameters for condition monitoring Ensuring proper classification in accordance with 10 CFR 50.65(a)(1) or
-(a)(2) Verifying appropriate performance criteria for structures, systems, and components classified as having an adequate demonstration of performance through preventive maintenance, as described in 10 CFR 50.65(a)(2), or as requiring the establishment of appropriate and adequate goals and corrective actions for systems classified as not having adequate performance, as described in 10 CFR 50.65(a)(1)
The inspectors assessed performance issues with respect to the reliability, availability, and condition monitoring of the system. In addition, the inspectors verified maintenance effectiveness issues were entered into the corrective action program with the appropriate significance characterization. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of one maintenance effectiveness sample
, as defined in Inspection Procedure 71111.12-05.
b. Findings
No findings were identified.
1R13 Maintenance Risk Assessments and Emergent Work Control
a. Inspection Scope
The inspectors reviewed licensee personnel
's evaluation and management of plant risk for the maintenance and emergent work activities affecting risk-significant and safety-related equipment listed below to verify that the appropriate risk assessments were performed prior to removing equipment for work:
March 31 through April 22, 2013, Unit 2, Forced O utage 2F1302 maintenance activities including: main transformer 2A replacement, pressurizer spray valve 655B replacement, residual heat removal pump 2C bearing and seal replacement, and nuclear instrument cable replacements April 29 through May 3, 2013, Unit 1, large train A work week
, including emergent work activities on a failed circuit card for loop A delta temperature and average coolant temperature May 5 through 13, 2013, Unit 1, emergent activities for pressurizer heater back-up group 1A breaker failure and planned reliability outage for stator cooling water 1P1301; Unit 2, large train A planned maintenance work week June 3 through 6, 2013, Unit 2, planned activities for train A Class 1E 125-Vdc batteries and inverter that exceeded the time allowed before entering the risk managed technical specifications allowed outage time The inspectors selected these activities based on potential risk significance relative to the reactor safety cornerstones. As applicable for each activity, the inspectors verified that licensee personnel performed risk assessments as required by 10 CFR 50.65(a)(4) and that the assessments were accurate and complete. When licensee personnel performed emergent work, the inspectors verified that the licensee personnel promptly assessed and managed plant risk. The inspectors reviewed the scope of maintenance work, discussed the results of the assessment with the licensee
's probabilistic risk analyst or shift technical advisor, and verified plant conditions were consistent with the risk assessment. The inspectors also reviewed the technical specification requirements and inspected portions of redundant safety systems, when applicable, to verify risk analysis assumptions were valid and applicable requirements were met.
Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of four maintenance risk assessments and emergent work control inspection sample s , as defined in Inspection Procedure 71111.13-05.
b. Findings
No findings were identified.
1R15 Operability Evaluations and Functionality Assessments
(71111.15)
a. Inspection Scope
The inspectors reviewed the following assessments
- April 25, 2013, Unit 2, component cooling water train B isolation low level switch April 26, 2013, Unit 2, essential cooling water train B motor bearing high vibration April 30, 2013, Unit s 1 and 2, essential cooling water train s A, B, and C pump motor end play tolerances May 2, 2013, Units 1 and 2, fire protection system higher than normal operatin g pressure during post
-maintenance run of diesel fire pump 2 May 22, 2013, Units 1 and 2, standby diesel generator Part 21 for missing valve keeper seals June 4, 2013, Units 1 and 2, spent fuel pool mitigation strategy The inspectors selected these operability and functionality assessments based on the risk significance of the associated components and systems.
The inspectors evaluated the technical adequacy of the evaluations to ensure technical specification operability was properly justified and to verify the subject component or system remained available such that no unrecognized increase in risk occurred.
The inspectors compared the operability and design criteria in the appropriate sections of the technical specifications and UFSAR to the licensee's evaluations to determine whether the components or systems were operable.
Where compensatory measures were required to maintain operability, the inspectors determined whether the measures in place would function as intended and were properly controlled.
Additionally, the inspectors reviewed a sampling of corrective action documents to verify that the licensee was identifying and correcting any deficiencies associated with operability evaluations.
Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of six operability evaluations inspection samples
, as defined in Inspection Procedure 71111.15-05.
b. Findings
Introduction.
The inspectors identified a Green finding for the licensee's failure to follow Procedure 0PGP04
-ZA-0307, "Preparation of Calculations," Revision 4. Specifically two parts were not followed
, step 3.1.5.4 states all design calculations SHALL be identified AND their sources indicated by providing an adequate title/description; and step 3.2.2 which instructs performing a peer check review of the calculation for completeness , clarity, and accuracy.
Description.
As part of a routine walkdown of the spent fuel pool area
, the inspectors identified several items of concern regarding the licensee's spent fuel pool mitigation strategy equipment. The inspectors determined that the licensee did not follow Procedure 0PGP04
-ZA-0307 for the implementation of the fill and/or spray strategy. Specifically, the as
-designed equipment did not match the as
-installed configuration and the as-designed calculations did not account for standard engineering practices to ensure that all considerations were accounted for. For example, a single 2 1/2 inch fire hose versus two 2 1/2 inch fire hoses
- 200 gpm versus 250 gpm
- and stresses associated with the weight of the hoses, water, fittings, etc. The licensee captured these issues in Condition Reports 13
-3767 and 13
-5006. Corrective actions included updating the calculations to include standard engineering practices and ensuring that the design matched the as
-installed configuration.
Analysis.
The failure to follow Procedure 0PGP04
-ZA-0307 to ensure an adequate design calculation and review for accuracy was a performance deficiency. This finding was more than minor because it adversely affected the design control attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective to provide reasonable assurance that physical design barriers such as fuel cladding protect the public from radionuclide releases caused by accidents or events. Design control was affected in the area of plant modification s that maintain post
-accident cooling of the spent fuel pool cooling system. Specifically, the field installation did not match the design calculations and those design calculations did not include an evaluation for all the calculation components used
, which resulted in significant errors requiring the calculations be revised.
The licensee entered this finding into the corrective action program as Condition Reports 13-3767 and 13
-5006.
The inspectors performed the significance determination process using NRC Inspection Manual Chapter 0609
, Attachment 4, "Initial Characterization of Findings," dated June 19, 2012, because the finding affected the Barrier Integrity cornerstone while the plant was at power. Attachment 4 evaluates the finding using Appendix L, "B.5.b Significance Determination Process
", "Table 2 - Significance Characterization,"
dated December 24, 2009, as a finding of very low safety significance because the finding did not result in an unrecoverable mitigating strategy due to the unavailability of post-accident cooling systems for the spent fuel pool
. No cross-cutting aspects are assigned to this finding because the calculations were performed in 2007 and 2008
, and , therefore , are not considered indicative of current performance.
Enforcement.
This finding does not involve enforcement action because no violation of a regulatory requirement was identified. Because this finding does not involve a violation and is of very low safety significance, it is identified as a finding.
-01; 05000499/2013003
-01, "Inadequate Design Calculations for Spent Fuel Pool Mitigation Strategi es")
1R19 Post-Maintenance Testing
a. Inspection Scope
The inspectors reviewed the following post
-maintenance activities to verify that procedures and test activities were adequate to ensure system operability and functional capability:
April 12, 2013, Unit 2, reactor coolant system loop 2D pressurizer spray valve 655B body cut out and replacement May 2, 2013, Unit 2, electrical penetration restoration between control room and train A electrical spreading room May 3, 2013, Unit 1, replacement of failed loop A 7300 system summing amplifier card that generates a delta flux penalty and caused a step change in overpressure delta temperature setpoint June 5, 2013, Unit 1, replacement of the power supply for the speed control on standby diesel generator 12 June 18, 2013, Unit 1, auxiliary feedwater 14 trip throttle valve and auxiliary feedwater pump 14 regulating maintenance The inspectors selected these activities based upon the structure, system, or component's ability to affect risk. The inspectors evaluated these activities for the following (as applicable):
The effect of testing on the plant had been adequately addressed; testing was adequate for the maintenance performed Acceptance criteria were clear and demonstrated operational readiness; test instrumentation was appropriate The inspectors evaluated the activities against the technical specification s, the UFSAR , 10 CFR Part 50 requirements, licensee procedures, and various NRC generic communications to ensure that the test results adequately ensured that the equipment met the licensing basis and design requirements. In addition, the inspectors reviewed corrective action documents associated with post
-maintenance tests to determine whether the licensee was identifying problems and entering them in the corrective action program and that the problems were being corrected commensurate with their importance to safety. Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of five post-maintenance testing inspection samples , as defined in Inspection Procedure 71111.19-05.
b. Findings
No findings were identified.
1R20 Refueling and Other Outage Activities
.1 Unit 2 Forced Outage 2F1302 for Main Transformer 2A
a. Inspection Scope
The inspectors reviewed the outage safety plan and contingency plans for the Unit 2 Forced Outage 2F1302, conducted January 8 through April 23, 2013, to confirm that licensee personnel had appropriately considered risk, industry experience, and previous site-specific problems in developing and implementing a plan that assured maintenance of defense in depth. During the forced outage, the inspectors observed portions of the shutdown and cooldown processes and monitored licensee controls over the outage activities listed below
. Configuration management, including maintenance of defense in depth, is commensurate with the outage safety plan for key safety functions and compliance with the applicable technical specification s when taking equipment out of service.
Clearance activities, including confirmation that tags were properly hung and equipment appropriately configured to safely support the work or testing.
Installation and configuration of reactor coolant pressure
- level; and temperature instruments to provide accurate indication, accounting for instrument error.
Status and configuration of electrical systems to ensure that technical specification s and outage safety
-plan requirements were met, and controls over switchyard activities.
Monitoring of decay heat removal processes, systems, and components. Verification that outage work was not impacting the ability of the operators to operate the spent fuel pool cooling system.
Reactor water inventory controls, including flow paths
- configurations
- and alternative means for inventory addition
- and controls to prevent inventory loss.
Controls over activities that could affect reactivity.
Startup and ascension to full power operation, tracking of startup prerequisites, walkdown of primary containment to verify that debris had not been left which could block emergency core cooling system suction strainers, and reactor physics testing.
Licensee identification and resolution of problems related to refueling outage activities.
Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of one refueling outage and other outage inspection sample
, as defined in Inspection Procedure 71111.20-05.
b. Findings
No findings were identified.
.2 Unit 1 Planned Reliability
Outage 1P 130 1 for Main Generator Stator Cooling Water
a. Inspection Scope
The inspectors reviewed the outage safety plan and contingency plans for the Unit 1 planned Reliability Outage 1P1301 for maintenance activities on the main generator stator cooling water system, conducted May 5 through 15, 2013, to confirm that licensee personnel had appropriately considered risk, industry experience, and previous site-specific problems in developing and implementing a plan that assured maintenance of defense in depth. During the planned outage, the inspectors observed portions of the shutdown and monitored licensee controls over the outage activities listed below.
Configuration management, including maintenance of defense in depth, is commensurate with the outage safety plan for key safety functions an d
compliance with the applicable technical specifications when taking equipment out of service.
Clearance activities, including confirmation that tags were properly hung and equipment appropriately configured to safely support the work or testing.
Status and configuration of electrical systems to ensure that technical specifications and outage safety
-plan requirements were met, and controls over switchyard activities.
Verification that outage work was not impacting the ability of the operators to operate the spent fuel pool cooling system.
Reactor water inventory controls, including flow paths
- configurations
- and alternative means for inventory addition
- and controls to prevent inventory loss.
Controls over activities that could affect reactivity.
Startup and ascension to full power operation, tracking of startup prerequisites, and reactor physics testing.
Licensee identification and resolution of problems related to outage activities.
Specific documents reviewed during this inspection are listed in the attachment. These activities constitute completion of one refueling outage and other outage inspection sample
, as defined in Inspection Procedure 71111.20-05.
b. Findings
No findings were identified.
R22 Surveillance Testing
a. Inspection Scope
The inspectors reviewed the UFSAR, procedure requirements, and technical specifications to ensure that the surveillance activities listed below demonstrated that the systems, structures, and/or components tested were capable of performing their intended safety functions. The inspectors either witnessed or reviewed test data to verify that the significant surveillance test attributes were adequate to address the following:
Preconditioning Evaluation of testing impact on the plant Acceptance criteria Test equipment Procedures Jumper/lifted lead controls Test data Testing frequency and method demonstrated technical specification operability Test equipment removal Restoration of plant systems Fulfillment of ASME Code requirements Updating of performance indicator data Engineering evaluations, root causes, and bases for returning tested systems, structures, and component s not meeting the test acceptance criteria were correct Reference setting data Annunciators and alarms setpoints The inspectors also verified that licensee personnel identified and implemented any needed corrective actions associated with the surveillance testing.
April 29, 2013, Unit 2, reactor coolant system leakage detection following Forced Outage 2F1302 May 10, 2013, Unit 2, essential chilled water pump 21A in
-service test May 30, 2013, Unit 2, auxiliary feedwater pump 24 in
-service test June 6, 2013, Unit 2, 125 volt Class 1E battery and 10 KVA inverter (train A, channel 1) surveillance June 25, 2013, Unit 2, pressurizer heater capacity verification Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of five surveillance testing inspection samples
, as defined in Inspection Procedure 71111.22-05.
b. Findings
No findings were identified.
RADIATION SAFETY
Cornerstone s: Public Radiation Safety and Occupational Radiation Safety 2 R S2 Occupational ALARA Planning and Controls (71124.02)
a. Inspection Scope
This area was inspected to assess performance with respect to maintaining occupational individual and collective radiation exposures ALARA. The inspectors used the requirements in 10 CFR Part 20, the technical specifications, and the licensee's procedures required by technical specifications as criteria for determining compliance.
During the inspection, the inspectors interviewed licensee personnel and reviewed the following items:
Site-specific ALARA procedures and collective exposure history, including the current 3-year rolling average; site
-specific trends in collective exposures; and source-term measurements ALARA work activity evaluations/post
-job reviews, exposure estimates, and exposure mitigation requirements The methodology for estimating work activity exposures, the intended dose outcome, the accuracy of dose rate and ma n-hour estimates, and intended versus actual work activity doses, and the reasons for any inconsistencies Records detailing the historical trends and current status of tracked plant source terms , and contingency plans for expected changes in the source term due to changes in plant fuel performance issues or changes in plant primary chemistry Audits, self
-assessments, and corrective action documents related to ALARA planning and controls since the last inspection Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of the one required sample
, as defined in Inspection Procedure 71124.02-05.
b. Findings
No findings were identified.
2RS4 Occupational Dose Assessment
a. Inspection Scope
This area was inspected to:
- (1) determine the accuracy and operability of personal monitoring equipment,
- (2) determine the accuracy and effectiveness of the licensee's methods for determining total effective dose equivalent, and
- (3) ensure occupational dose is appropriately monitored. The inspectors used the requirements in 10 CFR Part 20, the technical specifications, and the licensee's procedures required by technical specifications as criteria for determining compliance. During the inspection, the inspectors interviewed licensee personnel and reviewed the following items:
External dosimetry accreditation, storage, issue, use, and processing of active and passive dosimeters The technical competency and adequacy of the licensee's internal dosimetry program Adequacy of the dosimetry program for special dosimetry situations such as declared pregnant workers, multiple dosimetry placement, and neutron dose assessment Audits, self
-assessments, and corrective action documents related to dose assessment since the last inspection Specific documents reviewed during this inspection are listed in the attachment.
These activities constitute completion of the one required sample
, as defined in Inspection Procedure 71124.04-05.
b. Findings
No findings were identified.
OTHER ACTIVITIES
Cornerstones:
Initiating Events, Mitigating Systems, Barrier Integrity, Emergency Preparedness, Public Radiation Safety, Occupational Radiation Safety, and Physical Protection
OA1 Performance Indicator Verification
.1 Data Submission Issue
a. Inspection Scope
The inspectors performed a review of the performance indicator data submitted by the licensee for the first quarter 20 13 performance indicators for any obvious inconsistencies prior to its public release in accordance wit h Inspection Manual Chapter 0608, "Performance Indicator Program."
This review was performed as part of the inspectors' normal plant status activities and, as such, did not constitute a separate inspection sample.
b. Findings
No findings were identified.
.2 Unplanned Scrams per 7000 Critical Hours
(IE01)
a. Inspection Scope
The inspectors sampled licensee submittals for the unplanned scrams per 7000 critical hours performance indicator for Units 1 and 2 for the period from the second quarter 2012 through the first quarter 2013. To determine the accuracy of the performance indicator data reported during those periods, the inspectors used definitions and guidance contained in NEI Document 99
-02, "Regulatory Assessment Performance Indicator Guideline," Revision 6. The inspectors reviewed the licensee's operator narrative logs, issue reports, event reports
, and NRC integrated inspection reports for the period of April 2012 through March 2013 to validate the accuracy of the submittals. The inspectors also reviewed the licensee's issue report database to determine if any problems had been identified with the performance indicator data collected or transmitted for this indicator and none were identified. Specific documents reviewed are described in the attachme nt to this report
. These activities constitute completion of one unplanned scrams per 7000 critical hours sample per unit , as defined in Inspection Procedure 71151-05.
b. Findings
No findings were identified.
.3 Unplanned Power Changes
per 7000 Critical Hours (IE03)
a. Inspection Scope
The inspectors sampled licensee submittals for the unplanned power changes per 7000 critical hours performance indicator for Units 1 and 2 for the period from the second quarter 2012 through the first quarter 2013. To determine the accuracy of the performance indicator data reported during those periods, the inspectors used definitions and guidance contained in NEI Document 99
-02, "Regulatory Assessment Performance Indicator Guideline," Revision
6. The inspectors reviewed the licensee's operator narrative logs, issue reports, maintenance rule records, event reports and NRC
integrated inspection reports for the period of April 2012 through March 2013 to validate the accuracy of the submittals. The inspectors also reviewed the licensee's issue report database to determine if any problems had been identified with the performance indicator data collected or transmitted for this indicator and none were identified. Specific documents reviewed are described in the attachment to this report. These activities constitute completion of one unplanned transients per 7000 critical hours sample per unit , as defined in Inspection Procedure 71151-05.
b. Findings
No findings were identified.
.4 Unplanned Scrams with Complications
(IE0 4)
a. Inspection Scope
The inspectors sampled licensee submittals for the unplanned scrams with complications performance indicator for Units 1 and 2 for the period from the second quarter 2012 through the first quarter 2013. To determine the accuracy of the performance indicator data reported during those periods, the inspectors used definitions and guidance contained in NEI Document 99
-02, "Regulatory Assessment Performance Indicator Guideline," Revision
6. The inspectors reviewed the licensee's operator narrative logs, issue reports, event reports
, and NRC integrated inspection reports for the period of April 2012 through March 2013 to validate the accuracy of the submittals. The inspectors also reviewed the licensee's issue report database to determine if any problems had been identified with the performance indicator data collected or transmitted for this indicator and none were identified. Specific documents reviewed are described in the attachment to this report
. These activities constitute completion of on e unplanned scrams with complications sample per unit , as defined in Inspection Procedure 71151-05.
b. Findings
No findings were identified.
4OA2 Problem Identification and Resolution
.1 Routine Review of Identification and Resolution of Problems
a. Inspection Scope
As part of the various baseline inspection procedures discussed in previous sections of this report, the inspectors routinely reviewed issues during baseline inspection activities and plant status reviews to verify that they were being entered into the licensee's corrective action program at an appropriate threshold, that adequate attention was being given to timely corrective actions, and that adverse trends were identified and addressed. The inspectors reviewed attributes that included the complete and accurate identification of the problem; the timely correction, commensurate with the safety significance; the evaluation and disposition of performance issues, generic implications, common causes, contributing factors, root causes, extent of condition reviews, and previous occurrences reviews; and the classification, prioritization, focus, and timeliness of corrective actions. Minor issues entered into the licensee's corrective action program because of the inspectors' observations are included in the attached list of documents reviewed. These routine reviews for the identification and resolution of problems did not constitute any additional inspection samples. Instead, by procedure, they were considered an integral part of the inspections performed during the quarter and documented in Section 1 of this report.
b. Findings
No findings were identified.
.2 Daily Corrective Action Program Reviews
a. Inspection Scope
In order to assist with the identification of repetitive equipment failures and specific human performance issues for follow
-up, the inspectors performed a daily screening of items entered into the licensee's corrective action program. The inspectors accomplished this through review of the station's daily corrective action documents. The inspectors performed these daily reviews as part of their daily plant status monitoring activities and, as such, did not constitute any separate inspection samples.
b. Findings
No findings were identified.
.3 Semi-Annual Trend Review
a. Inspection Scope
The inspectors performed a review of the licensee's corrective action program and associated documents to identify trends that could indicate the existence of a more significant safety issue. The inspectors focused their review on repetitive equipment issues, but also considered the results of daily corrective action item screening discussed in Section 4OA2.2
, above, licensee trending efforts, and licensee human performance results. The inspectors nominally considered the 6
-month period of January 2 013 through June 2013, although some examples expanded beyond those dates where the scope of the trend warranted.
The inspectors also included issues documented outside the normal corrective action program in major equipment problem lists, repetitive and/or rework maintenance lists, departmental problem/challenges lists, system health reports, quality assurance audit/surveillance reports, self
-assessment reports, and Maintenance Rule assessments. The inspectors compared and contrasted their results with the results contained in the licensee's corrective action program trending reports. Corrective actions associated with a sample of the issues identified in the licensee's trending reports were reviewed for adequacy. These activities constitute completion of one single semi
-annual trend inspection sample , as defined in Inspection Procedure 71152-05.
b. Findings
No findings were identified.
4OA3 Follow-up of Events and Notices of Enforcement Discretion
(71153)
.1 (Closed) Licensee Event Report 05000499/2013
-00 2-00 and 05000499/2013 01 , "Reactor Trip Due to Main Transformer Lockout Relay Trip" On January 8, 2013, a failure of the Unit 2 main transformer 2A occurred which resulted in an automatic reactor trip. The failure of the main transformer resulted in a fire and damage to the transformer. The fire deluge system for the main transformer automatically activated and the onsite fire brigade responded. No offsite assistance was required. An Unusual Event was declared for Fire or Explosion in the Protected Area or Switchyard Which Affects Normal Operation that resulted in damage to equipment necessary for normal plant operation. As a result of normal site electrical bus alignment, the loss of the main transformer resulted in the loss of the unit auxiliary transformer and, therefore, loss of power to Class 1E 4160
-Vac busses 2A and 2C; the associated standby diesel generators started as required and loaded their respective busses. Bus 2B remained powered from offsite during the event. As a result of the partial loss of power, all reactor coolant pumps tripped and the plant was cooled down via natural circulation using auxiliary feedwater and the steam generator power operated relief valves. The Unusual Event was terminated after verification that no fire hazards existed, plant conditions stabilized, and offsite power was restored.
The most likely cause of the transformer failure was an internal electrical fault on the phase C high voltage windings. Corrective actions included replacing main transformer 2A with an on
-hand spare and implementing a large equipment asset management process. Revision 1 was submitted to describe and explain why a control room operator inappropriately switched the pressurizer master pressure controller from automatic to manual mode. It was determined that the control room operator's action did not extend or complicate the event.
The licensee event report was reviewed. No findings or violations of NRC requirements were identified.
.2 (Closed) Licensee Event Report 05000499/2013-003-00 and 0500499/2013
01 , "Operational Mode Change Prohibited by Limiting Condition for Operation 3.0.4 with Limiting Conditions for Operation Unknowingly Not Met for Inoperable Essential Cooling Water Pump" On January 14, 2013, after performing system trending, the licensee's essential cooling water system engineer identified a temperature excursion had occurred on essential cooling water pump 2B lower motor bearing on January 6, 2013. Essential cooling water pump 2B motor lower bearing temperature began to increase from 100 degrees Fahrenheit at about 11:00 p.m., peaked at 163 degrees Fahrenheit at 11:18 p.m., and then retur ned to normal by 1:25 a.m. on January 7, 2013. The bearing temperature did not reach the alarm level setpoint of 185 degrees Fahrenheit, therefore, no indication was provided to the control room operators of the elevated temperature
. However, t he system engineer initiated a condition report and vibration data was obtained on January 14, 2013. The data revealed increased vibration in the motor bearings and led to the determination that essential cooling water pump 2B was inoperable because the licensee did not have reasonable assurance that the pump would meet its 30-day mission time.
Although the operations staff was not aware of the temperature excursion and the pump remained in operation from December 26, 2012 through January 14, 2013
, until the licensee declared the pump inoperable, Unit 2 had transitioned from Mode 2 to Mode 1 with an inoperable essential cooling water pump and supported equipment
. Therefore , the mode change violated the limiting conditions for operation (LCO 3.0.4) and this event was reportable under 10 CFR 50.73(a)(2)(i)(8) for an operation or condition prohibited by the plant's technical specifications. The licensee performed a root cause investigation and determined the root cause to be insufficient motor shaft endplay resulted in axial forces on the lower bearing
, which caused fatigue in the material at the bearing race surface and spalling of the bearing inner race.
When the licensee's quality assurance department reviewed the root cause investigation and the circumstances surrounding the insufficient motor endplay
, they determined that similar work was performed on the Unit 1 essential cooling water pump 1C. Therefore, essential cooling water pump 1C should have been included in the extent of condition review. The licensee revised the root cause investigation to include the information identified by the quality assurance department. In addition, the licensee determined that all essential cooling water pump motors were subject to the same insufficient motor endplay, however, none had experienced the rapid temperature excursion while in operation, and
, therefore, remained operable. The licensee submitted Revision 1 of the licensee event report to include all of the essential cooling water pump motors as affected components. The licensee has planned maintenance to restore each essential cooling water pump motor to the motor endplay tolerances recommended by the vendor.
The licensee event report was reviewed. No findings or violations of NRC requirements were identified.
OA5 Other Activities
(Closed) Temporary Instruction 2515/182
- Review of the Industry Initiative to Control Degradation of Underground Piping and Tanks
a. Inspection scope
Leakage from buried and underground pipes has resulted in groundwater contamination incidents with associated heightened NRC and public interest. The industry issued a guidance document, NEI 09
-14, "Guideline for the Management of Buried Piping Integrity," (ADAMS Accession No. ML1030901420) to describe the goals and required actions (commitments made by the licensee) resulting from this underground piping and tank initiative. On December 31, 2010, NEI issued Revision 1 to NEI 09
-14, "Guidance for the Management of Underground Piping and Tank Integrity," (ADAMS Accession No.
ML110700122) with an expanded scope of components which included underground piping that was not in direct contact with the soil and underground tanks. On November 17, 2011, the NRC issued Temporary Instruction 2515/182, "Review of the Industry Initiative to Control Degradation of Underground Piping and Tanks," to gather information related to the industry's implementation of this initiative.
b. Findings and Observations
The licensee's buried piping and underground piping and tanks program was inspected in accordance with paragraph 03.02.a of the temporary instruction and the inspectors confirmed that activities which correspond to completion dates specified in the program which have passed since the Phase 1 inspection was conducted, have been completed.
Additionally, the licensee's buried piping and underground piping and tanks program was inspected in accordance with paragraph 03.02.b of the temporary instruction and responses to specific questions were submitted to the NRC headquarters staff.
Based upon the scope of the review described above, Phase II of TI
-2515/182 was complete d.
4OA6 Meetings , Including Exit
Exit Meeting Summary
On April 15, 2013, the inspectors presented the results of the radiation safety inspections to Mr. D. Rencurrel, Senior Vice President
, Operations, and other members of the licensee staff. The licensee acknowledged the issues presented. The inspectors asked the licensee whether any materials examined during the inspection should be considered proprietary. No proprietary information was identified.
On July 3 , 2013, the inspector s presented the inspection results to Mr. D. Koehl, President and Chief Executive Officer, and other members of the licensee staff. The licensee acknowledged the issues presented. The inspector asked the licensee whether any materials examined during the inspection should be considered proprietary. No proprietary information was identified.
SUPPLEMENTAL INFORMATION
KEY POINTS OF CONTACT
Licensee Personnel
- R. Aguilera, Manager, Health Physics
- M. Berg, Manager, Design Engineering
- C. Bowman, General Manager
, Engineering
- R. Dunn Jr., Manager, Nuclear Fuel and Analysis
- T. Frawley, Manager, Operations
- J. Hartley, Manager, Mechanical Maintenance
G. Hildebran
d t , Manager, Plant Protection
- D. Hubenak, ALARA/Planning Supervisor, Health Physics
- G. Janak, Manager, Unit 1 Operations
- B. Jenewein, Manager, Systems Engineering
- J. Lovejoy, Manager, I&C Maintenance
- B. Migl, Manager, Maintenance Engineering
(Acting)
- J. Milliff, Manager, Unit 2 Operations
- M. Murray, Manager, Regulatory Affairs
- J. Paul, Supervisor, Licensing
- L. Peter, Plant General Manager
- G. Powell, Site Vice President
- D. Rencurrel, Senior Vice President, Operations
- M. Ruvalcaba, Manager, Testing and Programs
- R. Savage, Engineer, Licensing Staff Specialist
- M. Schaefer, Manager, Nuclear Oversight
- S. Sovizral, Manager, Security
- R. Stastny, Maintenance Manage
r
- L. Stoicescu, Health Physicist
- D. Swett, General Supervisor Technical, Health Physics
- K. Van Daalen, ALARA Health Physicist, Health Physics
- T. Walker, Manager, Quality Assurance
- K. Wallis, Supervising Engineering
Specialist
- D. Zink, Supervising Engineer ing Specialist
Attachment 1
LIST OF ITEMS OPENED, CLOSED, AND DISCUSSED
Opened and Closed
-01
-01 FIN Inadequate Design Calculations for Spent Fuel Pool Mitigation Strategies
(Section 1R15)
Closed
- 05000499/2013-002-00
- 05000499/20
13-002-01 LER Reactor Trip
Due to Main Transformer Lockout Relay Trip (Section 4OA3)
-003-00
-003-01 LER Operational Mode Change Prohibited by Limiting Condition for Operation 3.0.4 with Limiting Conditions for Operation Unknowingly Not Met for Inoperable Essential Cooling Water Pump (Section 4OA3)
NRC TI 2515/182
TI Review of Implementation of the Industry Initiative to Control Degradation of Underground Piping and Tanks