IR 05000277/2009003
| ML092220599 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/10/2009 |
| From: | Krohn P G Reactor Projects Region 1 Branch 4 |
| To: | Pardee C G Exelon Generation Co, Exelon Nuclear |
| KROHN P G, RI/DRP/PB4/610-337-5120 | |
| References | |
| IR-09-003 | |
| Download: ML092220599 (35) | |
Text
August 10, 2009
Mr. Charles Senior Vice President, Exelon Generation Company, LLC President and Chief Nuclear Officer, Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT: PEACH BOTTOM ATOMIC POWER STATION - NRC INTEGRATED INSPECTION REPORT 05000277/2009003 AND 05000278/2009003
Dear Mr. Pardee:
On June 30, 2009, the U. S. Nuclear Regulatory Commission (NRC) completed an inspection at your Peach Bottom Atomic Power Station (PBAPS), Units 2 and 3. The enclosed integrated inspection report documents the inspection results, which were discussed on July 17, 2009, with Mr. William Maguire and other members of your staff.
The inspection 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.
Based on the results of this inspection, two self-revealing findings of very low safety significance (Green) were identified. One of these findings was determined to involve a violation of NRC requirements. Additionally, a licensee-identified violation which was determined to be of very low safety significance is listed in this report. However, because of the very low safety significance and because the finding has been entered into your corrective action program (CAP), the NRC is treating the finding as a non-cited violation (NCV), consistent with Section VI.A.1 of the NRC Enforcement Policy. If you contest the NCV in this report, you should provide a response within 30 days of the date of this inspection report, with the basis for your denial, to the Nuclear Regulatory Commission, ATTN: Document Control Desk, Washington, DC 20555-0001; with copies to the Regional Administrator, Region I; the Director, Office of Enforcement, U. S. NRC, Washington, DC 20555-0001; and the NRC Resident Inspector at the PBAPS. In addition, if you disagree with the characterization of the cross-cutting aspect of any finding in this report, you should provide a response within 30 days of the date of this inspection report, with the basis for your disagreement, to the Regional Administrator, Region 1 and the NRC Senior Resident Inspector at PBAPS. The information you provide will be considered in accordance with Inspection Manual Chapter (IMC) 0305.
In accordance with Title 10 of the Code of Federal Regulations (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 the NRC's document system (ADAMS). ADAMS is accessible from the NRC Website at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).
Sincerely,/RA/ Paul G. Krohn, Chief Reactor Projects Branch 4 Division of Reactor Projects Docket Nos.: 50-277, 50-278 License Nos.: DPR-44, DPR-56
Enclosures:
Inspection Report 05000277/2009003 and 05000278/2009003
w/Attachment:
Supplemental Information cc w/encl:
C. Crane, President and Chief Operating Officer, Exelon Corporation M. Pacilio, Chief Operating Officer, Exelon Nuclear W. Maguire, Site Vice President, Peach Bottom J. Grimes, Acting Senior Vice President, Mid-Atlantic R. Hovey, Senior Vice President, Nuclear Oversight G. Stathes, Plant Manager, Peach Bottom J. Armstrong, Regulatory Assurance Manager, Peach Bottom J. Bardurski, Manager, Financial Control & Co-Owner Affairs R. Franssen, Director, Operations P. Cowan, Director, Licensing D. Helker, Licensing K. Jury, Vice President, Licensing and Regulatory Affairs J. Bradley Fewell, Associate General Counsel, Exelon T. Wasong, Director, Training Correspondence Control Desk D. Allard, Director, Bureau of Radiation Protection, PA Department of Environmental Protection S. Gray, Administrator, Maryland Power Plant Research Program S. Pattison, Secretary, SLO, Maryland Department of the Environment M. Griffen, Maryland Department of Environment Public Service Commission of Maryland, Engineering Division Board of Supervisors, Peach Bottom Township B. O'Connor, Council Administrator of Harford County Council Mr. & Mrs. Dennis Hiebert, Peach Bottom Alliance E. Epstein, TMI - Alert J. Johnsrud, National Energy Committee, Sierra Club Mr. & Mrs. Kip Adams R. Fletcher, Dir, MD Environmental Program Manager, Radiological Health Program Director, Nuclear Safety Project, Union of Concerned Scientists R. Ayers, Deputy Mgr, Harford County Div of Emergency Operations E. Crist, Harford County Div of Emergency Operations S. Ayers, Emergency Planner, Harford County Div of Emergency Operations R. Brooks, Cecil County Dept of Emergency Services Publicly Available Records (PARS) component of the NRC's document system (ADAMS). ADAMS is accessible from the NRC Website at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).
Sincerely,/RA/ Paul G. Krohn, Chief Reactor Projects Branch 4 Division of Reactor Projects
Distribution w/encl:
(via E-mail)
S. Collins, RA M. Dapas, DRA D. Lew, DRP J. Clifford, DRP P. Krohn, DRP R. Fuhrmeister, DRP A. Rosebrook, DRP E. Torres, DRP J. Bream, DRP F. Bower, DRP, SRI M. Brown, DRP, RI S. Schmitt, DRP, OA L. Trocine, RI OEDO H. Chernoff, NRR R. Nelson, NRR J. Hughey, PM NRR P. Bamford, Backup NRR ROPreports@nrc.gov Region I Docket Room (with concurrences)
SUNSI Review Complete: ___PGK___ (Reviewer's Initials)
ML092220599 DOCUMENT NAME: G:\DRP\BRANCH4\INSPECTION REPORTS\PEACH BOTTOM\PBIR2009-003 REV 4.DOC After declaring this document "An Official Agency Record" it will be released to the Public.
To receive a copy of this document, indicate in the box: "C" = Copy without attachment/enclosure " E" = Copy with attachment
/enclosure "N" = No copy OFFICE RI/DRP RI/DRP RI/DRP NAME FBower/ PGK for JBream/ * PKrohn/ PGK DATE 08/10 /09 07/ 24 /09 08/10 /09 OFFICIAL RECORD COPY
- Concurred on 7/24/09, JRB
1 Enclosure U.S. NUCLEAR REGULATORY COMMISSION REGION I Docket Nos.: 50-277, 50-278
License Nos.: DPR-44, DPR-56 Report No.: 05000277/2009003 and 05000278/2009003 Licensee: Exelon Generation Company, LLC
Facility: Peach Bottom Atomic Power Station, Units 2 and 3
Location: Delta, Pennsylvania Dates: April 1, 2009 through June 30, 2009
Inspectors: F. Bower, Senior Resident Inspector M. Brown, Resident Inspector E. Torres, Project Engineer A. Ziedonis, Reactor Inspector
Approved by: Paul G. Krohn, Chief Reactor Projects Branch 4 Division of Reactor Projects
Enclosure 2
SUMMARY OF FINDINGS
IR 05000277/2009003, 05000278/2009003; 04/01/2009 - 06/30/2009; Peach Bottom Atomic
Power Station, Units 2 and 3; Identification and Resolution of Problems; Follow-up of Events and Notices of Enforcement Discretion
.
The report covered a three-month period of inspection by resident inspectors and an announced inspection by a regional reactor inspector. Two self-revealing findings were identified. The significance of most findings is indicated by their color (Green, White, Yellow, or Red) using IMC 0609, "Significance Determination Process" (SDP). Findings for which the SDP does not apply may be Green or be assigned a severity level after NRC management review. Cross-cutting aspects associated with findings are determined using IMC 0305, "Operating Reactor Assessment Program," dated January 2009. 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.
Cornerstone: Initiating Events
- Green.
A self-revealing finding was identified when PBAPS personnel incorrectly performed a maintenance procedure for tuning the reactor recirculation pump (RRP) motor generator (MG) set voltage regulator. Specifically, maintenance personnel adjusted a potentiometer in the wrong direction, which resulted in a trip of the RRP and an unplanned plant transient.
This finding is more than minor because the finding is associated with the human performance attribute of the Initiating Events Cornerstone, and adversely affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions. Specifically, this error resulted in an unplanned plant transient that reduced reactor power from 75 percent to 33 percent. In accordance with IMC 0609, Attachment 4, the inspectors determined this finding to be of very low safety significance (Green) since the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. This finding has a cross-cutting aspect in the area of human performance, Work Practices, because PBAPS did not define and effectively communicate expectations regarding procedural compliance and personnel did not follow procedures H.4(b). Specifically, PBAPS personnel did not follow procedure IC-11-02011 instructions for tuning the 3 'A' RRP MG set voltage regulator. (Section 4OA3.1)
Cornerstone: Mitigating Systems and Barrier Integrity
- Green.
A self-revealing NCV of 10 CFR 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," was identified. Specifically, Exelon's Motor Operated Valve (MOV) Program procedures lacked specific instructions to prescribe an acceptable frequency for performing valve stem lubrication, which resulted in test failures of safety-related MOVs and affected the reliability of the MOVs' safety functions.
On Unit 2, the inspectors determined that the finding was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). In accordance with IMC 0609, Attachment 4, the inspectors determined that the finding was of very low safety significance (Green)because it was not a design or qualification deficiency, did not represent a loss of system safety function, and was not associated with any external events. On Unit 3, the inspectors determined that the finding was more than minor because it was associated with the configuration control attribute of the Barrier Integrity Cornerstone and affected the cornerstone objective of providing reasonable assurance that physical design barriers (e.g., containment) protect the public from radionuclide releases caused by accidents or events. In accordance with IMC 0609, Attachment 4, the inspectors determined that the finding was of very low safety significance (Green) because it did not represent an actual open pathway in the physical integrity of reactor containment. For both units, this finding has a cross-cutting aspect in the area of Problem Identification and Resolution (PI&R), Corrective Action Program, because PBAPS did not thoroughly evaluate problems such that the resolutions addressed the causes and extent of condition P.1(c). Specifically, PBAPS failed to thoroughly evaluate previous conditions of degraded and hardened grease on safety-related valves, such that the extent of the condition was considered and the cause was resolved. (Section 4OA2)
Other Findings
A violation of very low safety significance, which was identified by the licensee, has been reviewed by the inspectors. Corrective actions taken or planned by the licensee have been entered into the licensee's CAP. This violation and the licensee's corrective action tracking numbers are listed in Section 4OA7 of this report.
5
REPORT DETAILS
Summary of Plant Status
Unit 2 began the inspection period at 100 percent rated thermal power (RTP). On April 24, a power reduction to 23 percent RTP was conducted in response to continued degradation and heating of electrical components in the electro-hydraulic control (EHC) system. On April 26, the unit was returned to full power. Unit 2 remained at or near full power for the remainder of the inspection period.
Unit 3 began the inspection period at 100 percent RTP. On May 22, power was reduced to 75 percent RTP to support planned summer readiness maintenance and adjustments to a RRP MG set voltage regulator. An unplanned power reduction from 75 percent to 32 percent occurred when the 3 'A' RRP tripped during the adjustments to its MG set voltage regulator. On May 25, the unit was returned to full power. On June 13, 2009, the unit was reduced to 62 percent for emergent maintenance to repair degrading condenser in-leakage on the 3 'B' main feed pump turbine exhaust expansion joint. On June 14, 2009, the unit was returned to full power. Unit 3 remained at or near full power for the remainder of the inspection period.
1.
REACTOR SAFETY
Cornerstones: Initiating Events, Mitigating Systems, and Barrier Integrity
1R01 Adverse Weather Protection (71111.01 - 2 Samples)
.1 Grid Reliability
a. Inspection Scope
The inspectors reviewed plant features and procedures for operation and continued availability of offsite and backup power systems during adverse weather (summer conditions). The inspectors reviewed communication protocols between the control room personnel and electrical system operations, as well as measures prescribed and taken to maintain the availability and reliability of these alternating current (AC) systems. Documents reviewed during this inspection are listed in the Attachment.
b. Findings
No findings of significance were identified.
.2 Summer Seasonal Readiness Preparations
a. Inspection Scope
The inspectors conducted a review of PBAPS's preparations for the 2009 summer conditions to verify selected features of the plant's design were sufficient to protect mitigating systems from the effects of adverse weather. The inspectors reviewed PBAPS's implementation of procedure WC-AA-107, "Seasonal Readiness," in preparation for summer season readiness. Documentation for selected risk-significant systems was reviewed to ensure that these systems would remain functional when challenged by inclement weather. During the inspection, the inspectors focused on plant specific design features and the licensee's procedures used to mitigate or respond to adverse weather conditions. The inspectors reviewed the Updated Final Safety Analysis Report (UFSAR) and performance requirements for systems selected for inspection. The inspectors reviewed CAP records to verify that the licensee was identifying adverse weather issues at an appropriate threshold and entering them into their CAP.
In addition, the inspectors reviewed the "Certification of 2009 Summer Readiness" memorandum dated May 15, 2009. Documents reviewed during this inspection are listed in the Attachment. The inspectors walked down the following systems and equipment:
- Intake Structure Ventilation System
- Emergency Diesel Generator (EDG) Building Ventilation System; and
- 'A' Supplemental Cooling Tower.
b. Findings
No findings of significance were identified.
1R04 Equipment Alignment
.1 Partial Walkdown (71111.04Q - 3 Samples)
a. Inspection Scope
The inspectors performed a partial walkdown of three systems to verify the operability of redundant or diverse trains and components when safety-related equipment was inoperable. The inspectors reviewed selected applicable operating procedures, walked down system components, and verified that selected breakers, valves, and support equipment were in the correct position to support system operation. Documents reviewed during this inspection are listed in the Attachment. The inspectors walked down the systems below:
- 'A' Control Room Chilled Water System with 'B' Control Room Chilled Water System OOS.
b. Findings
No findings of significance were identified.
.2 Complete Walkdown (71111.04S - 1 Sample)
a. Inspection Scope
The inspectors performed a complete system walkdown of the accessible portions of the Unit 2 reactor core isolation cooling system (RCIC), verifying that accessible breakers, valves and support equipment were properly aligned to support system operation. The inspectors reviewed system operating procedures and piping and instrumentation drawings; walked down control system components; and verified that circuit breakers and valves were in the appropriate positions. Documents reviewed during this inspection are listed in the Attachment.
b. Findings
No findings of significance were identified
1R05 Fire Protection
.1 Fire Protection - Tours (71111.05Q - 5 Samples)
a. Inspection Scope
The inspectors conducted fire protection walkdowns which were focused on availability, accessibility, and the condition of firefighting equipment. The inspectors reviewed areas to assess if PBAPS had implemented the Peach Bottom Fire Protection Plan (FPP) and adequately: controlled combustibles and ignition sources within the plant; maintained fire detection and suppression capability; and maintained the material condition of passive fire protection features. For the areas inspected, the inspectors also verified that PBAPS had followed the Technical Requirements Manual (TRM) and the FPP when compensatory measures were implemented for OOS, degraded, or inoperable fire protection equipment, systems, or features. 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 combustible materials were managed in accordance with plant procedures; and fire doors, dampers, and penetration seals appeared to be in satisfactory condition. Documents reviewed during this inspection are listed in the Attachment. The inspectors toured the following areas:
- Unit 3 Reactor Building Closed-Cooling Water (RBCCW) Room, Unit 3 Radwaste Building, 116' Elevation (Fire Zone 12B);
- Unit 3 High-Pressure Coolant Injection (HPCI) Room, Unit 3 Reactor Building, 88' Elevation (Fire Zone 62);
- Main Control Room, Turbine Building, 165' Elevation (Fire Zone 108); and
- Unit 3 Lube Oil Tank Room, Turbine Building, 116' Elevation (Fire Zone 89).
b. Findings
No findings of significance were identified.
.2 Annual Fire Protection Drill Observation (71111.05A - 1 Sample)
a. Inspection Scope
On April 16, 2009, the inspectors observed fire brigade classroom training and live-fire drills at the PECO Energy Fire Academy in West Conshohocken, Pennsylvania. The inspectors noted that the classroom training provided a refresher on the Incident Management System and its techniques, methods, and terminology that are used to manage fire fighting or hazardous material events.
The inspectors noted that the live-fire fighting was done in burn facilities that simulated a transformer oil fire and fire involving plant cabling and equipment. The observation was used to determine whether appropriate learning opportunities were provided and to determine the readiness of the plant fire brigade to fight fires. The inspectors verified that the PBAPS fire brigade participants and the training instructors identified deficiencies; openly discussed them in a self-critical manner at the drill debrief, and appropriately documented the identified issues to develop corrective actions for future training. Specific attributes evaluated were:
- Proper Wearing of Turnout Gear and Self-contained Breathing Apparatus;
- Proper Use and Layout of Fire Hoses;
- Employment of Appropriate Fire Fighting Techniques;
- Sufficient Fire Fighting Equipment Brought to the Scene;
- Effectiveness of Fire Brigade Leader Communications, Command, and Control;
- Search for Victims and Propagation of the Fire Into Other Plant Areas;
- Smoke Removal Operations;
- Use of Pre-planned Strategies;
- Adherence to the Pre-planned Drill Scenario; and
- Drill Objectives.
The inspectors verified that procedure RT-F-101-922-2, "Fire Drill," was completed to record the fire drill scenario used, document that the drill objectives were met, and capture the critique results.
b. Findings
No findings of significance were identified.
1R11 Licensed Operator Requalification Program (71111.11Q - 1 Sample)
.1 Resident Inspector Quarterly Review
a. Inspection Scope
On June 23, 2009, the inspectors observed two crews of licensed operators in the plant's simulator during licensed operator requalification examinations to verify that operator performance was adequate, evaluators were identifying and documenting crew performance deficiencies, and training was being conducted in accordance with licensee procedures. The crew's performance was compared to pre-established operator action expectations and successful critical task completion requirements. Documents reviewed during this inspection are listed in the Attachment. The inspectors evaluated the following areas:
- Licensed Operator Performance;
- Crew's Clarity and Formality of Communications;
- Ability to Take Timely Actions in the Conservative Direction;
- Prioritization, Interpretation, and Verification of Annunciator Alarms;
- Correct Use and Implementation of Abnormal and Emergency Procedures;
- Control Board Manipulations;
- Oversight and Direction from Supervisors; and
- Ability to Identify and Implement Appropriate Technical Specification (TS) Actions and Emergency Plan Actions and Notifications.
b. Findings
No findings of significance were identified.
1R12 Maintenance Effectiveness (71111.12Q - 2 Samples)
a. Inspection Scope
The inspectors evaluated PBAPS's work practices and follow-up corrective actions for safety-related structures, systems, and components (SSCs) and identified issues to assess the effectiveness of PBAPS's maintenance activities. The inspectors reviewed the performance history of SSCs and assessed Exelon's extent-of-condition (EOC) determinations for those issues with potential common cause or generic implications to evaluate the adequacy of the PBAPS's corrective actions. The inspectors assessed PBAPS's PI&R actions for these issues to evaluate whether PBAPS had appropriately monitored, evaluated, and dispositioned the issues in accordance with Exelon procedures and the requirements of 10 CFR 50.65, "Requirements for Monitoring the Effectiveness of Maintenance." In addition, the inspectors reviewed selected SSC classifications, performance criteria and goals, and Exelon's corrective actions that were taken or planned, to evaluate whether the actions were reasonable and appropriate. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following two samples:
- Repeat Master Trip Solenoid Valve (MTSV) Issues (IR 918352); and
- Apparent Cause Evaluation for Tritium Increase in Groundwater Monitoring Well #4 (IR 808183).
b. Findings
No findings of significance were identified.
1R13 Maintenance Risk Assessments and Emergent Work Control (71111.13 - 4 Samples)
a. Inspection Scope
The inspectors evaluated PBAPS
=s implementation of their Maintenance Risk Program with respect to the effectiveness of risk assessments performed for maintenance activities that were conducted on SSCs. The inspectors also verified that the licensee managed the risk in accordance with 10 CFR Part 50.65(a)(4) and procedure WC-AA-101, AOn-line Work Control Process." The inspectors evaluated whether PBAPS had taken the necessary steps to plan and control emergent work activities and to manage overall plant risk. The inspectors selectively reviewed PBAPS's use of the online risk monitoring software, and daily work schedules. The activities selected were based on plant maintenance schedules and systems that contributed to risk. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following samples:
- Emergent Power Reduction for Work to Correct Heating of Two Relays in the Unit 2 EHC System (Work Order (WO) C0227471 & IR 870284-08);
- Work Activities Associated with Unit 2 Residual Heat Removal (RHR) Discharge Valve MO-2-10-154B and Unit 3 RHR Pump Suction Valve MO-3-10-13D Underthrust Conditions (WO C0228319);
- Exceeded Adverse Condition Monitoring Plan (ACMP) Action Level for Unit 3 Main Condenser (WO A1714585).
b. Findings
No findings of significance were identified.
1R15 Operability Evaluations (71111.15 - 4 Samples)
a. Inspection Scope
The inspectors assessed the technical adequacy of the operability evaluations, the use and control of compensatory measures, and compliance with the licensing and design bases. Associated ACMPs, engineering technical evaluations, and operational and technical decision making documents were also reviewed. The inspectors verified these processes were performed in accordance with the applicable administrative procedures and were consistent with NRC guidance. Specifically, the inspectors referenced procedure OP-AA-108-115, "Operability Determinations," and NRC IMC Part 9900, "Operability Determinations & Functionality Assessments for Resolutions of Degraded or Nonconforming Conditions Adverse to Quality or Safety." The inspectors also used Technical Specifications (TSs), TRM, UFSAR, and associated Design Basis Documents as references during these reviews. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following samples:
- Determine the Scope of Torus Material and Method (Wet\Dry) that Requires Recoat in Unit 2 [P2R19] and Unit 3 [P3R18] Refueling Outages (IR 873016-03);
- Electrical Distribution Bases (3.8.7) Potential Needs Upgraded (IR 894904);
- Exceeded ACMP Action Levels for Unit 3 Main Condenser Air In-Leakage (IR 928762); and
- Unit 2 Reactor Recirculation Motor Breaker Action Level Changed from BLUE to YELLOW (IR 881184).
b. Findings
No findings of significance were identified.
1R18 Plant Modifications (71111.18 - 1 Sample)
.1 Temporary Modifications
a. Inspection Scope
The inspectors reviewed one temporary modification to verify that implementation of the modification did not place the plant in an unsafe condition. The review was also conducted to verify that the design bases, licensing bases, and performance capability of risk significant SSCs had not been degraded as a result of these modifications. The inspectors verified the modified equipment alignment through control room instrumentation observations; UFSAR, drawings, procedures, and WO reviews; and plant walkdowns of accessible equipment. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following sample:
- ECR 09-00078 000, Re-Route Cables from Damaged Duct Bank To Support Duct Bank Repair.
b. Findings
No findings of significance were identified.
1R19 Post-Maintenance Testing (71111.19 - 7 Samples)
a. Inspection Scope
The inspectors observed selected portions of post-maintenance testing (PMT) activities and reviewed completed test records. The inspectors observed whether the tests were performed in accordance with the approved procedures and assessed the adequacy of the test methodology based on the scope of maintenance work performed. In addition, the inspectors assessed the test acceptance criteria to evaluate whether the test demonstrated that the tested components satisfied the applicable design and licensing bases and the TS requirements. The inspectors reviewed the recorded test data to verify that the acceptance criteria were satisfied. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following samples:
- Perform Leak Sealant Injection on Regenerative Heat Exchanger Tube Side Outer Vent Valve (WO C0228895);
- 2 'A' Drywell Chiller, Rebuild and Eddy Current Test (WO C0220912);
- 2 'A' CAD Analyzer Failed to Trip During ST-I-07G-103-2 (WO C0229040);
- Replace 'A' Control Room Supply Fan Motor (WO C0229077);
b. Findings
No findings of significance were identified.
1R22 Surveillance Testing (71111.22 - 5 Samples)
a. Inspection Scope
The inspectors compared test data with established acceptance criteria to verify the systems demonstrated the capability of performing the intended safety functions. The inspectors also verified that the systems and components maintained operational readiness, met applicable TS requirements, and were capable of performing design basis functions. Documents reviewed during this inspection are listed in the Attachment. The inspectors reviewed the following samples:
- RT-O-01D-402-2, Master Trip Solenoid Valves Operability Test;
- SI3P-5-12-C1C2, Calibration Check of reactor protection system (RPS) Drywell Pressure Loop Instruments PT/PS 3-5-12C;
- ST-M-40D-905-2, Control Room Emergency Ventilation Filter Train 'A' Test;
- ST-O-010-301-2, 2 'A' RHR Loop Pump, Valve, Flow, and Unit Cooler Functional and Inservice Test [Inservice Test Sample]; and
- ST-O-020-560-2, Reactor Coolant Leakage Test [RCS Leakage Sample].
b. Findings
No findings of significance were identified.
Cornerstone:
1EP6 EP Drill Evaluation (71114.06 - 1 Drill Sample)
a. Inspection Scope
The inspectors evaluated the conduct of a PBAPS emergency drill on June 1, 2009, to identify any weaknesses and deficiencies in classification and notification activities. The drill was conducted to provide drill and exercise performance (DEP) opportunities for the DEP performance indicator (PI). The inspectors observed operators respond to events in the simulator control room through the declaration and notification of an alert. The inspectors observed the operations shift manager transition emergency response command and control responsibilities to the site emergency director in the technical support center (TSC). The inspectors relocated to the TSC to observe command and control of the emergency response organization and dose assessment as the event escalated to the declaration and notification of a site area emergency. The inspectors verified that the event classification and notifications were done in accordance with EP-AA-1007, "Exelon Nuclear Radiological Emergency Plan Annex for PBAPS." The inspectors verified that the drill evaluators correctly counted the drill's contribution in the calculation of the DEP PI. The inspectors also verified that operations personnel in the simulator control room identified weaknesses or deficiencies during the critique of the drill. The following simulated events were classified during this training exercise:
- FS1 - Site Area Emergency, Fission Product Barrier Degradation; and
- HA5 - Alert, Natural and Destructive Phenomena.
b. Findings
No findings of significance were identified.
OTHER ACTIVITIES
4OA1 Performance Indicator Verification (71151 - 10 Samples)
Cornerstone:
Initiating Events and Barrier Integrity
.1 Initiating Events PIs (71151 - 6 Samples)
a. Inspection Scope
The inspectors sampled PBAPS's submittals for the PIs listed below for Units 2 and 3 for the period from January 2008 through March 2009. PI definitions and guidance contained in Nuclear Energy Institute (NEI) 99-02, "Regulatory Assessment Performance Indicator Guideline," Revision 5, were used to verify the accuracy of the PI data. The inspectors reviewed selected portions of the operating logs and raw PI data, and selected applicable licensee event reports and CAP documents from the period for each PI specified below. The inspectors compared graphical representations from the most recent PI report to the raw data and used the performance indicator definition in the NEI guideline to verify that the data were correctly reflected in the report. Documents reviewed during this inspection are listed in the Attachment. The following six PI samples were reviewed:
Units 2 and 3
- Unplanned Scrams;
- Unplanned Scrams with Complications; and
- Unplanned Power Changes.
b. Findings
No findings of significance were identified.
.2 Barrier Integrity PIs (71151 - 4 Samples)
a. Inspection Scope
The inspectors reviewed a sample of PBAPS's submittals for the four Barrier Integrity PIs listed below to verify the accuracy of the data reported. The PI definitions and the guidance contained in NEI 99-02, "Regulatory Assessment Performance Indicator Guideline," Revision 5, and Exelon procedure LS-AA-2001, "Collecting and Reporting of NRC Performance Indicator Data," were used to verify that the reporting requirements were met. The inspectors reviewed raw PI data collected since January 2008 to April 2009 and compared graphical representations from the most recent PI report to the raw data to verify the data was included in the report. Documents reviewed during this inspection are listed in the Attachment. The following four PI samples were reviewed:
Units 2 and 3
- Reactor Coolant System (RCS) Specific Activity; and
- RCS Leakage.
4OA2 Identification and Resolution of Problems (PI&R)
(71152 - 2 Samples)1. Annual Sample: MOV Hardened Grease Challenges (1 In-depth Review Sample)
a. Inspection Scope
This inspection focused on Exelon's identification, evaluation, and resolution of challenges associated with hardened grease on safety-related MOV. Specifically, two HPCI valves failed to stroke to the full open position during surveillance testing on March 12 and March 21, 2009. MOV disassembly and inspection identified hardened grease on the stem and inside the stem nut of both valves. Initial extent-of-condition evaluations revealed that two RHR valves developed less-than-required closing thrust for successful diagnostic test acceptance. Hardened grease was also identified on the stem and inside the stem nut of both RHR valves. The final extent-of-condition scoping determined that 45 safety-related MOVs required additional evaluation appropriate to the circumstances, such as visual inspection, grease evaluation, diagnostic testing, and/or corrective maintenance.
The inspectors reviewed Exelon's associated root cause evaluation, operability evaluations, corrective action reports, and a sample of diagnostic and stroke time test data, and interviewed plant personnel to evaluate the adequacy of Exelon's performance in the areas of problem identification, evaluation, extent-of-condition scoping, and corrective actions. Additionally, the inspectors observed the integrity of damaged, worn, and newly machined stem nuts to evaluate the effect of plant conditions on stem nut integrity. Finally, the inspectors reviewed MOV program procedures to evaluate the quality and effectiveness of the Exelon MOV program, as implemented at PBAPS. Documents reviewed are listed in the Attachment.
b. Findings and Observations
Introduction
- A Green, self-revealing NCV of 10 CFR 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," was identified. Specifically, Exelon's MOV Program procedures lacked specific instructions to prescribe an acceptable frequency for performing valve stem lubrication, which resulted in test failures of safety-related MOVs and affected the reliability of the MOVs' safety functions.
Description:
During quarterly surveillance testing performed by Exelon on March 12, 2009, the Unit 2 HPCI torus inboard suction MOV (MO-2-23-058) failed to stroke full open during its quarterly surveillance test and was subsequently declared inoperable. Investigation by Exelon identified dried and hardened grease on the valve stem and stem nut, and a root cause investigation was assigned to Exelon engineering staff.
Extent-of-condition inspections were performed by Exelon on select HPCI MOVs over the next several days. Degraded grease was identified on the outboard torus suction MOV for Unit 3 (MO-3-23-057), but the condition was determined not to impact valve operability. Exelon rescheduled the periodic stem lubrication interval on the Unit 3 HPCI MOV from ten years to six years, and assigned this PM to the next Unit 3 refueling outage (fall of 2009). Subsequently, on March 21, 2009, the Unit 3 HPCI torus outboard suction MOV failed to stroke full open during quarterly surveillance testing and was declared inoperable. Investigation by Exelon identified hardened grease on the stem and inside the stem nut, as well as stem nut wear. As a result of the failure, Exelon expanded the extent-of-condition scope to include diagnostic testing of MOVs on both units within the affected HPCI valve group (total of 6 MOVs), as well as eleven other safety-related MOVs based on diagnostic test data margins, as well as similar stem characteristics.
During the diagnostic testing of the Unit 3 RHR loop 'D' torus suction MOV (MO-3-10-13D) on March 26, 2009, Exelon identified less-than-required thrust at the torque switch trip, and the valve was subsequently declared inoperable. Investigation by Exelon revealed that the stem grease was degraded and several stem nut threads were damaged. As a result of this test failure, the extent-of-condition scope was again expanded. Exelon concluded that 45 safety-related MOVs required additional evaluation, such as visual inspection, grease evaluation, diagnostic testing, and/or corrective maintenance. This review identified one additional MOV under-thrust condition on the Unit 2 RHR loop 'B' outboard discharge MOV (MO 2-10-154B) during diagnostic testing on April 2, 2009. Exelon investigation into this MOV test failure identified a degraded grease condition, and the MOV was declared inoperable. The NRC inspectors reviewed the final extent-of-condition scoping, and found that it was appropriate to the circumstances.
Exelon performed immediate corrective actions after each of the MOV failures, which included cleaning and removing the old grease from the stem and stem nut area, applying new grease, and performing diagnostic testing to ensure successful valve performance. Exelon performed operability evaluations for each of the four MOV failures, and concluded three of the four MOVs would have been capable of performing their intended safety function for all design basis events. The operability evaluation for the Unit 3 RHR loop 'D' torus suction MOV concluded that the valve would not have been able to perform its safety function of containment isolation for all design basis events.
Operability evaluations for the other three MOVs determined that the valves would have been capable of performing their safety functions for all design basis events. The Unit 2 RHR loop 'B' discharge MOV is normally open in a standby mode for low pressure coolant injection, and was evaluated for its design function to close during suppression pool cooling and containment spray modes of the RHR system. Exelon concluded that the valve motor torque capability would have provided enough inertia to hard seat the valve from the as-found torque switch trip condition in the extent-of-condition diagnostic test. The operability evaluations for the Unit 2 and Unit 3 HPCI torus suction MOVs stated that the torque switch trip protection, which stopped the valve from completely opening through the degraded grease conditions during the surveillance tests, is bypassed during safety actuation signals to open. Exelon determined that the valve motor torque capability, absent torque switch trip protection, was sufficient to open the valve during all design basis events despite the degraded grease conditions. The inspectors reviewed the operability evaluations and agreed that Exelon's conclusions regarding past operability were reasonable. However, the capability of the MOVs to perform their mitigating safety functions was challenged, thereby impacting their reliability.
A root cause evaluation was performed by Exelon in response to the four MOV failures. The root cause evaluation determined that Peach Bottom MOV PM frequencies and actions had not appropriately included stem lubricant performance feedback. The NRC inspectors reviewed the root cause evaluation and agreed that an adequate MOV program would schedule and adjust PM activities as necessary to assure that safety-related MOVs can perform their functions as required. The root cause evaluation stated that Exelon had the longest allowable MOV PM lubrication intervals in the entire nuclear fleet (up to 10 years). Previous industry guidance and vendor information had described Exxon Nebula Extreme Pressure (EP) - 1, the MOV lubricant used at PBAPS, as being susceptible to degradation and hardening phenomena. The Exelon root cause identified that Exxon cancelled production of Nebula EP-1 in 2001, stating a one-year limited shelf life. Additionally, the EOC inspections performed by Exelon identified mixtures of Nebula EP-1, along with some remains of the former PBAPS MOV lubricant, N5000 NeverSeez, on several valve stems and stem nuts. Industry guidance has noted that NeverSeez is incompatible with Nebula EP-1 due to an accelerated hardening and degradation effect. Finally, since using EP-1 grease, Peach Bottom had many opportunities to re-evaluate their MOV PM lubrication frequencies and actions, including:
- October 2006: MO-3-10-026B failed to successfully stroke. Internal inspection identified severely degraded grease, and the stem nut was replaced.
- October 2007: NRC PI&R inspection of the October 2006 MO-3-10-026B failure to stroke noted that although Exelon identified a hardened grease condition, this was not determined to be the most probable cause of the failure, and no EOC evaluation was performed. Subsequent walkdowns by the inspector identified degraded lubricating grease on MO-3-10-031A. Exelon staff noted that the grease appeared to be a mixture of EP-1 and NeverSeez. (IR 689020). This was documented in NRC Inspection Report 05000277&278/2007005.
- October 2008: MO-2-23-057 (Unit 2 HPCI outboard torus suction MOV) stroked slowly and failed to close. Degraded lubricating grease and stem nut wear were identified, and the stem nut was replaced.
- January 2009: MO-3-01A-077 failed to go full open. The valve stem was cleaned and re-lubricated and the stroke time decreased.
Analysis:
The inspectors determined that Exelon's failure to properly implement MOV preventive maintenance activities, specifically with respect to stem lubrication necessary to assure that MOVs will function when required, constituted a performance deficiency. Specifically, degraded stem lubrication was identified as a common factor in four safety-related MOV test failures between March 12, 2009 and April 2, 2009.
Unit 2: The finding for Unit 2 was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems (MS) Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the HPCI torus inboard suction MOV and the RHR loop 'B' outboard discharge MOV experienced test failures, were declared inoperable, and required detailed operability evaluations as described above, thereby challenging their reliability and capability to perform their safety function. Using the Phase 1 worksheet in 4 of Manual Chapter 0609, "Significance Determination Process," the finding affected the MS Cornerstone and was of very low safety significance (Green) because it was not a design or qualification deficiency, did not represent a loss of system safety function, and was not associated with any external events.
Unit 3: The finding for Unit 3 was more than minor because it was associated with the configuration control attribute of the Barrier Integrity (BI) Cornerstone and affected the cornerstone objective of providing reasonable assurance that physical design barriers (e.g., containment) protect the public from radionuclide releases caused by accidents or events. Specifically, RHR loop 'D' torus suction MOV was determined by Exelon to not be capable of isolating for all design basis events. Using the Phase 1 worksheet in Attachment 4 of Manual Chapter 0609, "Significance Determination Process," the finding affected the BI cornerstone and was of very low safety significance (Green) because it did not represent an actual open pathway in the physical integrity of reactor containment. Although the Unit 3 HPCI torus outboard suction MOV condition affected the mitigating system cornerstone, the Unit 3 finding analysis was assigned to the BI cornerstone because it best reflected the dominant risk of the finding.
This finding has a cross-cutting aspect in the area of PI&R, Corrective Action Program, because PBAPS did not thoroughly evaluate problems such that the resolutions addressed the causes and extent of condition P.1(c). Specifically, PBAPS failed to thoroughly evaluate previous conditions of degraded and hardened grease on safety-related valves, such that the extent of the condition was considered and the cause was resolved. This cross-cutting aspect is applied to both Units 2 and 3.
Enforcement:
10 CFR Part 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," requires, in part, that "Activities affecting quality shall be prescribed by documented instructions, procedures, or drawings, of a type appropriate to the circumstances and shall be accomplished in accordance with these instructions, procedures, or drawings." Contrary to the above, the Exelon MOV program procedures (ER-AA-300 Series and MA-AA-723-300 Series) were not appropriate to the circumstances, in that, they lacked specific instructions to prescribe an acceptable frequency for performing valve stem lubrication, given the limited shelf life of the MOV lubrication grease used by the station as described in the above section. As a consequence of this, four safety-related MOVs experienced test failures between March 12, 2009 and April 2, 2009, attributed to degraded and hardened lubricating grease. Because this finding is of very low safety significance and has been entered into Exelon's CAP (IR 892191), this violation is being treated as a Green NCV consistent with section VI.A.1 of the NRC Enforcement Policy: NCV 05000277/2009003-01, and NCV 05000278/2009003-01, MOV Program Procedures were Inadequate with Regard to Periodicity of Preventive Maintenance Activities for Stem Lubrication.
.2 Semi-Annual Review to Identify Trends (1 Trend Review Sample)
a. Inspection Scope
The inspectors reviewed lists of CAP items to identify trends (either NRC or licensee identified) that might indicate the existence of a safety issue. First, the inspectors reviewed a list of approximately 7,250 IRs that PBAPS initiated and entered into the CAP action tracking system from December 1, 2008 through June 1, 2009. The inspectors also reviewed the approximately 3450 IRs that remained open with outstanding actions. The list was reviewed and screened to complete the required semi-annual PI&R trend review. Based on the review, a sample of 58 IRs (listed in the Attachment) were selected for a more detailed review to determine whether the issues were adequately identified and evaluated, and that corrective actions were planned. The inspectors evaluated the IRs against the requirements of Exelon procedure, LS-AA-125, and 10 CFR 50, Appendix B, Criterion XVI, "Corrective Action."
b. Findings and Observations
Based on the review, the inspectors observed that there was an adverse trend of human performance related events during the period. Specific examples included:
- the inadequate configuration control of an inoperable control rod (IR 880318);
- inadequate risk assessment and maintenance practices for work on the control circuitry for containment isolation valves (IR 887441);
- inadequate procedure adherence that resulted in the trip of a RRP (IR 923239);
- an inadequate understanding of the maintenance and operation of a WRNM channel (IR 871864); and,
- removal, for inspection, of an incorrect pin from a spent fuel bundle (IR 853625).
The inspectors also noted an adverse trend in equipment reliability issues that challenged plant operations. Specifically:
- the build-up of combustible gases in the 3 'A' main power transformer that resulted in an unplanned power reduction (IR 868369);
- the failure of EHC cards that led to an unplanned power reduction in response to turbine bypass valve cycling (IR 891763);
- indications of friction between selected Unit 3 control rods and fuel channels (IR 874398); and,
- inoperable motor operated valves that resulted from inadequate preventive maintenance and hardened grease (IRs 892191 and 913965).
However, the inspectors noted that PBAPS self-identified an adverse trend in station performance and proactively performed a common cause analysis (IR 896381) to understand the causes for the adverse trend and to identify corrective actions and improvement plans.
.3 Review of Items Entered into the CAP
As required by IP 71152, "Identification and Resolution of Problems," and in order to help identify repetitive equipment failures or specific human performance issues for follow-up, the inspectors performed screening of all items entered into the licensee' CAP. This was accomplished by reviewing the description of each new action request/issue report and attending daily management review committee meetings.
4OA3 Follow-up of Events and Notices of Enforcement Discretion (71153 - 4 Samples)
.1 Personnel Performance - 3 'A' RRP Trip
a. Inspection Scope
The inspectors reviewed corrective action documents listed in the Attachment to this report and discussed the events surrounding the trip of the 3 'A' RRP with the personnel involved. The inspectors reviewed Revision 4 of IC-11-02011, "Recirc MG Set Voltage Regulator Tuning," and Revision 3 of HU-AA-104-101, "Procedure Use and Adherence."
b. Findings
Introduction:
A Green, self-revealing finding occurred when PBAPS personnel incorrectly performed a maintenance procedure for tuning the 3 'A' RRP MG set voltage regulator. Specifically, maintenance personnel adjusted a potentiometer in the wrong direction which resulted in a trip of the RRP and an unplanned Unit 3 plant transient.
Description:
On May 23, 2009, at approximately 9:30 a.m., the PBAPS Unit 3 'A' RRP tripped. The trip occurred while instrument and controls (I&C) maintenance technicians were performing procedure IC-11-02011, "Recirc MG Set Voltage Regulator Tuning,"
step 5.1.6.8. Step 5.1.6.8 states, "Verify step test box potentiometer is at MAXIMUM resistance (fully counter-clockwise) and CLOSE the switch of the step test circuit." Contrary to the procedure instructions, the potentiometer, on the step test box, that is used to vary the test current applied to the RRP MG set voltage regulator field, was incorrectly positioned to the minimum resistance (fully clockwise) position. When the test box switch was closed, the incorrect positioning of the potentiometer resulted in an excessive MG set field current that tripped the MG set field breaker.
The trip of the MG set field breaker resulted in the loss of the 3 'A' RRP. The loss of core flow caused reactor power to decrease from approximately 75 percent to 33 percent. In response to the loss of the 3 'A' RRP, operators entered operational transient procedure, OT-112, "Unexpected/Unexplained Change in Core Flow" and executed actions to stabilize the plant in single loop operations. I&C personnel aborted the performance of IC-11-02011 and removed all test equipment. The 3 'A' RRP was subsequently restored per system operating procedure, SO 2A.1.B-3, "Starting the Second Recirculation Pump" at 4:32 p.m. the same day.
PBAPS's investigation indicated that there was a mindset among the technicians performing the work that the potentiometer had to be set to the maximum position and that this position was fully clockwise. Interviews with several I&C technicians indicated that the word "MAXIMUM" as it relates to the operation of variable inputs almost always refers to the fully clockwise position. During the pre-job brief there was no mention of rotating the potentiometer either clockwise or counter-clockwise, only of taking it to maximum. When the technicians reached the job site, the first technician verified the test box was in the maximum position by attempting to rotate the potentiometer in the clockwise position. The technician then announced what his actions were and handed the procedure to a second technician who read the step and took the same action to verify the potentiometer position. This peer check was flawed because the first technician inappropriately took the action without a peer check and then asked for a peer check after the action was taken. The job supervisor was present during the entire evolution providing management oversight, and failed to notice the incorrect position of the potentiometer.
Following the incorrect setting of the potentiometer, the technicians moved the test box switch from the OPEN to the CLOSE position which inserted the test signal and tripped the 3 'A' MG set and RRP. Immediately after the event, the technicians and their supervisor checked the connections and potentiometer position and all agreed the setup was correct. When the team reached the main control room, the procedure was re-read and the technicians realized the error in the positioning of the test box potentiometer.
The inspectors reviewed the root cause report to assess its details, accuracy, and planned corrective actions. The inspectors concluded that the root cause report was thorough, detailed, and comprehensive. The planned and completed corrective actions were appropriate and comprehensive. The licensee identified two root causes and two contributing causes for this event. The root causes included failure to adhere to a Level 1 (step-by-step performance) procedure due to performing work in a knowledge-based versus rule-based manner and the failure to perform an adequate peer check to verify the potentiometer position that resulted in a lost opportunity to identify the error prior to the plant transient. PBAPS's investigation determined that the technician performing the work was operating in the knowledge-based thinking mode because he knew that the potentiometer needed to be in the maximum position. If the technician had operated in the rule-based thinking mode, he would have been complying with the procedure instructions verbatim. The peer check was flawed in that the first technician took the action without a peer check and inappropriately asked the second technician for a peer check after the action was taken.
Analysis:
The inspectors determined that the I&C technician's failure to follow the procedure for tuning the 3 'A' RRP MG set voltage regulator that resulted in a trip of the RRP MG set and an unplanned plant transient was a performance deficiency. This finding was more than minor because it was associated with the human performance attribute of the Initiating Events Cornerstone and adversely affected the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions. Specifically, this error resulted in an unplanned plant transient that reduced Unit 3 reactor power from 75 percent to 33 percent. In accordance with IMC 0609, Attachment 4, the inspectors determined this finding to be of very low safety significance (Green) since the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available.
This finding has a cross-cutting aspect in the area of human performance, Work Practices, because PBAPS did not define and effectively communicate expectations regarding procedural compliance and personnel did not follow procedures H.4(b).
Specifically, PBAPS personnel did not follow procedure IC-11-02011 instructions for tuning the 3 'A' RRP MG set voltage regulator
Enforcement:
The inspectors determined that the finding did not represent a violation of regulatory requirements because it involved a procedure violation of a non-safety related procedure. This finding will be tracked as FIN 05000278/2009003-02 , Inadequate Procedure Adherence Results in Trip of 3 'A' Recirc Pump and Plant Transient.
.2 (Closed) Licensee Event Report (LER) 05000278/2009-03-00, Inoperable Containment Isolation Valve Results in Condition Prohibited by TSs
On March 26, 2009, it was discovered that the 3D RHR pump suppression pool suction isolation valve (MO-3-10-013D) was degraded due to a greasing deficiency identified during performance of EOC testing associated with grease deficiencies previously discovered on motor-operated valves (MOVs). It was determined that this condition was prohibited by TSs since this valve is a primary containment isolation valve and was inoperable for containment isolation purposes for a time period longer than allowed by TS. The cause of the greasing deficiency was grease hardening primarily due to inadequate preventive maintenance. The valve was repaired and returned to service on March 27, 2009. A finding related to this event was documented in report section 4OA2.1. This LER is closed.
.3 (Closed) LER 05000277/2009-01-00, Clearance Performance Error Results in Condition Prohibited by TSs
On February 13, 2009, PBAPS personnel discovered that an operation prohibited by TS existed when a TS required action for an inoperable Unit 2 control rod (Control Rod 10-51) was found not met. Specifically, at 9:33 a.m. on February 13, during a plant walkdown being conducted in preparation to vent selected control rod drive (CRD) hydraulic control units (HCUs), the CRD HCU directional control valves (DCVs) for Control Rod 10-51 were discovered to be energized (armed). To comply with TS 3.1.3, Condition C, these DCVs should have been de-energized (disarmed) since the 10-51 CRD HCU had been rendered inoperable for the conduct of maintenance on February 11. This condition was due to an operator error that re-armed the DCV during the modification of a safety tagging clearance that occurred at approximately 5:30 a.m. on February 12, 2009. On February 13, after the TS non-compliance was identified at 9:33 a.m., prompt action was taken to disarm the CRD and restore TS compliance by 9:42 a.m. Since Control Rod 10-51 remained fully inserted during this event, PBAPS concluded that there was no actual safety consequences associated with this event. There were no previous similar LERs identified. A licensee-identified NCV for this issue is documented in Section 4OA7; therefore, this LER is closed.
.4 (Closed) LER 05000278/2009-01-00, Control Rods Inoperable During Mode 2 Operations As a Result of Interferences
As a result of control rod interference monitoring testing performed by Operations personnel on January 28, 2009, it was determined that three control rods were inoperable during the Unit 3 shutdown that was performed on January 21. This testing determined that Control Rods 14-55, 18-55, and 42-55 could be inoperable for operational conditions involving time periods when reactor pressure is below 850 psig (Mode 2 operations). This occurrence was considered reportable as a common cause that resulted in the inoperability of three control rods for approximately 4.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br /> on January 21, during Mode 2 operations. The common cause is related to control rod blade interferences with the fuel bundle channel. PBAPS concluded that there were no actual safety consequences associated with this event and that appropriate shutdown margin was maintained during this event. Subsequently, a control rod interference monitoring and testing program was established. EOC testing was performed on Units 2 and 3. There were no previous similar LERS identified.
The inspectors reviewed the event and concluded that the condition was appropriately reported as a common-cause inoperability. However, no violation or condition prohibited by TS existed because, in accordance with TS 3.1.3, Condition E, Unit 3 was taken to Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> of reactor pressure being reduced below 850 psig; therefore, this LER is closed.
4OA5 Other Activities
.1 Quarterly Resident Inspector Observations of Security Personnel and Activities
a. Inspection Scope
During the inspection period the inspectors conducted observations of security force personnel and activities to ensure that the activities were consistent with licensee security procedures and regulatory requirements relating to nuclear plant security. These observations took place during both normal and off-normal plant working hours.
These quarterly resident inspector observations of security force personnel and activities did not constitute any additional inspection samples. Rather, they were considered an integral part of the inspectors' normal plant status reviews and inspection activities.
b. Findings
No findings of significance were identified.
4OA6 Meetings, Including Exit
Exit Meeting Summary
On July 17, 2009, the resident inspectors presented the inspection results to Mr. W. Maguire and other PBAPS staff, who acknowledged the findings. The inspectors asked the licensee whether any of the material examined during the inspection should be considered proprietary. No proprietary information was identified.
4OA7 Licensee-Identified Violations
The following violation of very low significance (Green) was identified by the licensee and is a violation of NRC requirements which meets the criteria of Section VI of the NRC Enforcement Policy for being dispositioned as a NCV.
- TS 3.1.3, Condition C, requires that control rods that are inoperable for reasons other than being stuck shall be fully inserted and disarmed. TS 3.1.3, Condition E, requires the unit to be in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> if Condition C cannot be met. On February 11, the 10-51 CRD HCU was declared inoperable for the conduct of maintenance and the TS required actions to fully insert and disarm the CRD were met. Following the completion of maintenance on the HCU, an operator erroneously re-armed the CRD HCU DCVs during the modification of a safety tagging clearance that occurred at approximately 5:30 a.m. on February 12. Over 28 hours3.240741e-4 days <br />0.00778 hours <br />4.62963e-5 weeks <br />1.0654e-5 months <br /> later and in excess of the 12-hour completion time allowed by TS 3.1.3, PBAPS personnel discovered the error and disarmed the CRD for Control Rod 10-51. PBAPS documented this issue in the CAP as IR 880318. Since Control Rod 10-51 remained fully inserted and there was no loss of safety function during the period of non-compliance, this issue is of very low (Green) safety significance. The LER associated with the event was documented in Section 4OA3.3.
ATTACHMENT:
SUPPLEMENTAL INFORMATION
KEY POINTS OF CONTACT
Exelon Generation Company Personnel
- W. Maguire, Site Vice President
- G. Stathes, Plant Manager
- J. Armstrong, Regulatory Assurance Manager
- E. Flick, Engineering Director
- P. Navin, Work Management Director
- L. Lucas, Chemistry Manager
- R. Franssen, Operations Director
- R. Holmes, Radiation Protection Manager
- D. DeBoer, Security Manager
- T. Wasong, Training Director
NRC Personnel
- F. Bower, Senior Resident Inspector
- M. Brown, Resident Inspector
- E. Torres, Project Engineer
- A. Ziedonis, Reactor Inspector
LIST OF ITEMS OPENED, CLOSED, AND DISCUSSED
Opened
None
Opened/Closed
- 05000277/2009003-01 NCV MOV Program Procedures were
- 05000278/2009003-01 Inadequate with Regard to Periodicity of Preventive Maintenance Activities for Stem Lubrication (Section 4OA2.1)
- 05000278/2009003-02 FIN Inadequate Procedure Adherence Results in Trip of 3 'A'
Recirc Pump and Plant Transient (Section 4OA3.1)
Closed
- 05000278/2009-03-00 LER Inoperable Containment Isolation Valve Results in Condition Prohibited by TSs (Section 4OA3.2)
- 05000277/2009-01-00 LER Clearance Performance Error Results in Condition Prohibited by TSs (Section 4OA3.3)
- 05000278/2009-01-00 LER Control Rods Inoperable During Mode 2 Operations as a Result of Interferences (Section 4OA3.4)
Discussed
None
LIST OF DOCUMENTS REVIEWED
Section 1R01: Adverse Weather Protection
- SE-16, Revision 4, "Grid Emergency"
- SE-16, Attachment A, Revision 2, Power Team Generation Dispatcher/Power System Director (PTGD/PSD) Communications to Peach Bottom
- WC-AA-104, Revision 14, "Review and Screening for Production/Atmospheric/Environmental Risk"
- WC-AA-101, Revision 16, "On-Line Work Control Procedure"
- WC-AA-107, Revision 6, "Seasonal Readiness"
- WC-AA-8000, Revision 2, "Interface Procedure between Energy Delivery (ComED/PECO) and Exelon Generation (Nuclear/Power) for Construction and Maintenance Activities"
- WC-AA-8003, Revision 1, "Interface Procedure between Energy Delivery (ComED/PECO) and Exelon Generation (Nuclear/Power) for Design Engineering and Transmission Planning Activities"
- OP-AA-108-107, Revision 2, "Switchyard Control"
- OP-AA-108-107-1001, Revision 2, "Station Response to Grid Capacity Conditions"
- OP-AA-108-107-1002, Revision 4, "Interface Agreement between Exelon Energy Delivery and Exelon Generation for Switchyard Operations"
- McDonald, John E.; "PECO Nuclear Station Switchyard Readiness Certification for Summer 2009," Memo to Michael Pacillio; May 15, 2009
- IR 891537, 2009 Summer Readiness Action Item Tracking
- IR 932267, Perform Permanent Repair to 'A' Cooling Tower Lift Pump Can
- IR 922632, High Acetylene Levels in the 3SU Transformer Load Tap Changer
- IR 921205, Aging Equipment HIT - Cooling Tower LTAM Review Issues
- IR 918739, Large Transformer Summer Readiness Assessment
- IR 917454, Unit 3 Switchgear House Exhaust Fan Breaker Tripped on Magnetics
- IR 913699, Cooling Tower Walkdown Inspection
- IR 912528, Unit 2 'B' Phase Main Transformer Cooling Bank Not Turning On
- A-3IR
- 907656, Broken Joint Found on 'A' Cooling Tower Lift Pump
- IR 887537, Unit 3 Auxiliary Transformer Cooling Fan Not Running
Section 1R04: Equipment Alignment
- Drawing 6280-M-359, 360 RCIC System
- COL 44B.1.A, Revision 6, Control Room Chilled Water System
Section 1R05: Fire Protection
- PF-12B, Revision 3, Prefire Strategy Plan U3 RBCCW Room Radwaste Building 116,
- Fire Zone 12B
- PF-62, Revision 4, Prefire Strategy Plan U3 HPCI Room 88' Elevation, Fire Zone 62
- PF-89, Revision 2, Prefire Strategy Plan Lube Oil Tank Room,
- TB3-116, Fire Zone 89
- PF-108, Revision 3, Prefire Strategy Plan Control Room, Turbine Building 165' Elevation,
- Fire Zone 108
- PF-4C, Revision 6, Prefire Strategy Plan U2 RX Recirc Pump MG Set Room, Radwaste
- Building, 135' Elevation, Fire Zone 4C
Section 1R11: Licensed Operator Requalification Program
- OP-AA-101-111, Roles and Responsibilities of On-Shift Personnel, Revision 3
- OP-AA-103-102, Watchstanding Practices, Revision 8
- OP-AA-103-103, Operation of Plant Equipment, Revision 0
- OP-AA-104-101, Communications, Revision 1 PSEG1009R, Revision 3, Loss of Vacuum, Electrical ATWS
Section 1R12: Maintenance Effectiveness
- IR 875571, Clearances Required for Unit 3 Control Rods
- IR 889545, 2B MTSV Failed to Reset
- IR 906648, 2A MTSV Slow to Tripp
- IR 906661, 2B MTSV Failed to Reset
- IR 909080, 3A MTSV Failed to Reset
- IR 909628, 2B MTSV Failed to Reset
- IR 912636, 2B MTSV Slow to Reset
- IR 932238, Small Water Leak in Unit 3 CST Moat
- IR 930640, Unit 3 CST Moat Water is Cloudy Since Moat Recoat
- IR 928861, Document Results of Tritium Age Dating
- IR 927784, Develop Contingency Plans for Well Drilling
- IR 921975, Evaluate Soft Digging Inside the Unit 3 CST Moat Area
- IR 916050, Increase in Unit 3 Yard Drain Sum Tritium
- IR 895539, Tritium Detected in New Monitoring Wells
- IR 814380, Continued Increase in Tritium Level in Well #4
- IR 791859, Increased Tritium Level Trend for Groundwater Monitoring Well #4
- A-4
Section 1R13: Maintenance Risk Assessments and Emergent Work Control
- IR 870284, Heating on the Base of the XK8 Relay
- IR 877404, Heating on the EHC XK17 Relay Spade Connection
- IR 911610, Unit 2 EHC XK17 Relay Found Loose in Its Base
- IR 911675, Cause of EHC Relay Hot Spot Identified
- IR 911903, Improvement Opportunity in PORC Review of EHC Power Supply AR A1695813, Heating on the Base of the XK8 Relay
- C0227471, Replace XK8 Relay and Base, Rework XK17 Connector
- ER-AA-302-1001, MOV Rising Stem Motor Operated Valve Thrust and Torque
- Sizing and Set-up Window Determination Methodology, Revision 6 I.E.Bulletin 85-03, Supplement 1: Motor Operated Valve Common Mode Failures During Plant
- Transients due to Improper Switch Settings
- IR 060023, Dedication of Lubrication Used on Safety-Related Systems
- IR 827482, U2 HPCI
- MO-57 Stroked in Alert Range Then Stopped Moving
- IR 892191,
- MO-2-23-058 Stopped in Intermediate Position
- IR 895626, U3 HPCI Suction Valve Stem Grease Condition
- IR 895789, U3 HPCI Torus Suction
- MO-3-23-57, Split Indication
- IR 896914, Test Results of Stored Exxon Nebula
- EP-1 Grease
- IR 899298, Procedure
- MA-AA-723-301 Deficiency
- IR 906768,
- MO-2-10-015D Did Not Stroke Open During PMT
- C0228763, 3AP017, Investigate/Replace Pump WO R1102249, 3AF106, PM: Replace Filter Element
- WO M1687797, Replace Filter
- WO A1709877, Foreign Material was Found in 3AF106 Discharge Micron filter Letter from PBAPS to NRC, dated May 14, 1999: Response to Generic Letter 96-05 Letter from NRC to PBAPS, dated November 16, 2000: Safety Evaluation by NRR of Licensee
- Response to Generic Letter 96-05
- MA-AA-723-301, Periodic Inspection of Limitorque Model SMB/SB/SBD-000 through 5 Motor
- Operated valves, Revision 4 M-C-700-241, Limitorque Motor Operator Installation, Revision 5 NRC Inspection Report 50-277/92-82 and 50-278-92-82 NRC Inspection Report: Motor- Operated Valve Inspection 94-12
- NRC Inspection Report 50-277/96-03 and 50-278/96-03 NRC Inspection Report 50-277/97-07 and 50-278/97-07 NRC Inspection Report 50-277/99-01 and 50-278/99-01 NRC Inspection Report 05000440/2005003: Perry Supplemental Inspection NRC Inspection Report 05000277/2007005 and 05000278/2007005, Section 4OA2.3: U2 MOV
- Failure to Stroke Follow-up NUREG/CR-6750: Performance of MOV Stem Lubricants at Elevated Temperatures
- MO-3-10-025B-OP: Motor Operator PM WO A1714585, Exceeded ACMP Action level for U3 Main Condenser WO
- C0227407,
- XJ-3170B; Additional Sealant Application
- WO A1579262, Proactive Replacement of the 3B RFPT Exhaust Expansion Joint WO A1700673, 4 scfm Step Change in U3 Offgas Flow WO A1636058, U3 Step Increase in Offgas Flow on 10/18/07
- A-5WO A1714764, LP Turbine to Condenser Expansion Joint has Leakage WO R1127007, Helium Mass Spectro Connection to Offgas
- IR 931031, Air In-leakage at 3A LP Turbine Dog Bone
- IR 931035, Condensate Drain Tank - Small Leak Identified
- IR 936787, Bearing #6 Slop Drain Confirmed Leakage with Smoke
- IR 936791, U3 Turbine #4 Slop Drain Cover Dislocated Procedure SO 5.7.A-3, Revision 8, Main Condenser Vacuum Leak Monitoring and Search
Section 1R15: Operability Evaluations
- IR 873016, P3R18 Torus Recoat
- IR 838841, P3R17 CISI Scope - UT of Piping in Torus Airspace
- IR 838844, P3R17 CISI Scope - Torus Diver Inspections
- IR 878127, P3R17 Torus Cleaning and Inspection
- IR 873016, P3R18 Torus Recoat
- IR 838841, P3R17 CISI Scope - UT of Piping in Torus Airspace
- IR 838844, P3R17 CISI Scope - Torus Diver Inspections
- IR 878127, P3R17 Torus Cleaning and Inspection
- IR 919671, TS 3.8.7 Interpretation Concerns
- IR 931760 -TS 3.8.7 Interpretation Concerns Information Notice 97-80:
- Licensee TS Interpretations
- IR 881184, 2BA034 (3402) Action Level Changed from "Blue" to "Yellow" ACMP - Unit 2 'B' Recirc Pump Trip Breaker Temperatures
- IR 867732, 2BA034 (3401) Inspect Breaker During Next Refuel Outage
- IR 867719, 2BA034 (3402) Inspect Breaker During Next Refuel Outage
Section 1R18: Plant Modifications
- AR A1693909, Damaged Electrical Ductbank
- C0226402, Install Monitoring Equipment/ TCCP 08-00408
Section 1R19: Post-Maintenance Testing
- C0220912, 2AK018, Rebuild and Eddy Current Test
- SO 44A.6.A-2, Placing an Additional Drywell Chiller in Service
- IR 910529, 2 'A' Drywell Chiller Tripped during PMT Run
- AR A1711246, Leakage in Unit 3 RWCU Regenerative Heat Exchanger Room WO
- C0228895,
- HV-3-12-30K/31K:
- Perform Leak Repair
- IR 918477, Leakage in Unit 3 RWCU Regenerative Heat Exchanger Room Technical Repair Procedure (TRP) - 3002, Revision 1, 1/8" NPT Drill and Tap
- CC-AA-404, Maintenance Specification:
- Application, Selection, Evaluation and Control of Temporary Leak Repairs
- IR 921526, 2 'A' CAD Analyzer Failed to Trip During
- C0229040, Determine Which SV is Not Isolating
- ST-I-07G-103-2, PCIS Group III Logic System Functional Test, Completed on 5/19/09 WO A1712378, 2 'A' CAD Analyzer Failed to Trip WO
- C0225963 - Replace the Tube Bundles during the TSA Window WO A1651390 - E1 EDG Jacket Coolant Heat Exchanger Reduced Margin
- C0229077, 0AV079-DR, Replace Motor
- ECR 09-00291, 0AV079-DR is Obsolete WO A1712722, 0AV079-DR is Obsolete P&ID Drawing - M-384, Control Room HVAC
- A-6WO
- C0229510, Troubleshoot Speed Switch, Rework as required WO R1067972, 0AG012-DR - Diesel Engine Inspection WO R1067972 - Act. 74, Perform PMT of Speed Switch WO R1067972 - Act 81, Remove/ Repair Tachometer
- IR 935794, ECW/ESW Pumps Did Not Auto Start During E-1 DG Testing
- IR 935053, Red indicating light on for EHC Micron Filters WO A1716915, 3BF106 Red indicating light on for EHC Micron Filters WO M1716915, Replace Filter
Procedure
- SO 1D.5.A-3, Revision 25, Electrohydraulic Control System Filter Changing and Cleaning
Section 1R22: Surveillance Testing
- IR 910465, Line Up Incorrect for A CREV Filter Testing
- ST-M-40D-905-2, Revision 17, Control Room Emergency Ventilation Filter Train 'A' Test
- ON-115, Loss of Normal Main Control Room Ventilation SI3P-5-12-C1C2, Revision 8, Calibration Check of RPS Drywell Pressure Loop Instruments PT/PS 3-5-12C WO R1066021, RPS DW Pressure 'C' Loop Inst
- RT-O-01D-402-2, Revision 5, Master Trip Solenoid Valves Operability Test
- WO R1126058, Master Trip Solenoid Valves Operability Test
- IR 906649, 'A' MTSV Slow to Operate
- IR 926105, Increased Unit 2 Drywell Floor Drain Pump Outs (Unidentified Leakage)
Section 4OA1: Performance Indicator (PI) Verification
- LS-AA-2001, Revision 12, Collecting and Reporting of NRC Performance Indicators Data
- LS-AA-2090, Revision 4, Monthly Data Elements for NRC RCS Specific Activity
- LS-AA-2100, Revision 5, Monthly Data Elements for NRC RCS Leakage
- ST-O-020-560-2, Reactor Coolant Leakage Test (sample of completed test records)
- ST-O-020-560-3, Reactor Coolant Leakage Test (sample of completed test records)
- ST-C-095-864-2, Off Gas Monitor Response and Release Rate Verification by a Grab Sample
- ST-C-095-864-3, Off Gas Monitor Response and Release Rate Verification by a Grab Sample
- ST-C-095-820-2, Determination of Dose Equivalent µCi/g I-131 in Primary Coolant
- ST-C-095-820-3, Determination of Dose Equivalent µCi/g I-131 in Primary Coolant
- CH-407, Sampling of Reactor Water
Section 4OA2: Identification and Resolution of Problems
- ER-AA-300, Motor Operated Valve Program Administrative Procedure, Revision 5
- ER-AA-302, Motor Operated Valve Program Engineering Procedure, Revision 5
- ER-AA-302-1001, MOV Rising Stem Motor Operated Valve Thrust and Torque Sizing and Set- up Window Determination Methodology, Revision 6
- ER-AA-302-1003, MOV Margin Analysis and Periodic Verification Test Intervals, Revision 5
- ER-AA-302-1004, Motor Operated Valve Performance Trending, Revision 4
- ER-AA-302-1006, Generic Letter 96-05 Program Motor-Operated Valve Maintenance and
- Testing Guidelines, Revision 7 M-C-700-241, Limitorque Motor Operator Installation, Revision 5
- MA-AA-723-300, Diagnostic Testing of Motor Operated Valves
- MA-AA-723-300-1001, Motor Operated Valve "At the Valve" Diagnostic Test Reduction
- A-7Strategy, Revision 0
- MA-AA-723-301, Periodic Inspection of Limitorque Model SMB/SB/SBD-000 through 5 Motor
- Operated valves, Revision 4
- MA-AA-723-302-1001, MOV Rising Stem Motor Operated Valve Thrust and Torque Sizing and
- Set-up Window Determination Methodology M-C-700-241, Limitorque Motor Operator Installation, Revision 5
- IR 060023, Dedication of Lubrication Used on Safety Related Systems
- IR 827482, U2 HPCI
- MO-57 Stroked in Alert Range Then Stopped Moving
- IR 892191,
- MO-2-23-058 Stopped in Intermediate Position
- IR 892191, Assignment 8, Root Cause for MOV Degraded Grease and Performance Issues
- IR 895626, U3 HPCI Suction Valve Stem Grease Condition
- IR 895789, U3 HPCI Torus Suction
- MO-3-23-57, Split Indication
- IR 896914, Test Results of Stored Exxon Nebula
- EP-1 Grease
- IR 898030,
- MO-3-10-13D Stem Nut Wear & Underthrust
- IR 899298, Procedure
- MA-AA-723-301 Deficiency
- IR 901501,
- MO-2-10-154B As-found Test Underthrust
- IR 906768,
- MO-2-10-015D Did Not Stroke Open During PMT Letter from PBAPS to NRC, dated May 14, 1999: Response to Generic Letter 96-05 Letter from NRC to PBAPS, dated November 16, 2000: Safety Evaluation by NRR of Licensee
- Response to Generic Letter 96-05 Peach Bottom Unit 3
- LER 09-03, Inoperable Containment Isolation Valve Results in Condition
- Prohibited by TSs, May 12, 2009 NRC Inspection Report 50-277/92-82 and 50-278-92-82 NRC Inspection Report: MOV Inspection 94-12 NRC Inspection Report 50-277/96-03 and 50-278/96-03
- NRC Inspection Report 50-277/97-07 and 50-278/97-07 NRC Inspection Report 50-277/99-01 and 50-278/99-01 NRC Inspection Report 05000440/2005003: Perry Supplemental Inspection NRC Integrated Inspection Report 05000387/2006003 and 05000388/2006003, Section 1R15 NRC Integrated Inspection Report 05000277/2007005 and 05000278/2007005, Section
- PB-09-009 Green, Peach Bottom: HPCI Torus Suction Inboard
- Isolation Valve
- MO-2-23 Failed in Mid-stroke and did not Fully Open Nuclear Event Report (NER)
- NC-09-014-Y Yellow: MOVs Fail to Operate due to Degraded
- Stem Lubrication Nuclear Network Operating Experience Report,
- Fully Function NUREG/CR-6750: Performance of MOV Stem Lubricants at Elevated Temperatures P&ID: RHR, M-361, Sh. 2 EPRI Technical Repair Guideline for Limitorque Model
- SMB-000 Valve Actuators, Revision 1 I.E.Bulletin 85-03, Supplement 1: Motor Operated Valve Common Mode Failures during Plant
- Transients due to Improper Switch Settings Limitorque Bulletin
- SMB1-82C, "Limitorque Type SMB Instruction Manual and Maintenance
- Manual," copyright 1982 WO R0013148:
- MO-3-10-025B-OP: Motor Operator PM
- Issue Reports
- IR 880318, U2
- HCU 10-51 DCV's Connected with Control Rod Inop.
- IR 887441, Fuse 16A-F20 was Blown During
- PS-9087G Replacement
- A-8IR
- 853625, Incorrect Pins Were Removed & Inspected on Fuel Bundle JLM633
- IR 923239, 3A Recirc Pump Trip
- IR 820443, 250 Volt DC Disconnect Found Closed During
- AO 57B.9-2
- IR 871864, Spurious 'A' WRNM Short Period Trip
- IR 869364, 3A WRNM is Not Responding
- IR 868369, U3 Power Reduction for 3C Main Transformer Gassing
- IR 891763, U3 #1 BPV Cycling
- IR 874398, Indications of Channel Distortion - Peach Bottom 3
- IR 687330, Unplanned Downpower in Response to 3A Recirc Seal Hi Temp
- IR 753418, Unexpected Speed Changes on 3A Recirc
- IR 892191,
- MO-2-23-058, Stopped in Intermediate
- IR 913965, Failure of
- MO-3-10-013D to Stroke During
- IR 636103,
- PE-0121 Provided Non-Conservative MOV Voltages in Midas
- IR 608000, Heat Transfer Test Unsat. Update PTRM
- IR 647108, Loss of Turbine Building Negative
- IR 642941, LEFM System Impact Due to Letter from Manufacturer
- IR 650861, Unit 1 Water Sample Greater Than Effluent Concentration Limit
- IR 808191, Evaluation of Unit 1 Containment Tritium
- IR 811317, Unit 1 Tech Specs Potentially Non-Conservative
- IR 304543, Develop Strategy for Long-Term Reliability of HPSW Piping
- IR 618185, Cathodic Protection System Action Plan
- IR 822594, Service Water to ESW Cross Tie Check Valve Leaks Through
- IR 451634, NRC I.D. NPSH Margin for FSSD in Re-Rate
- IR 452577, Lack of Allowance for Frequency Variation in EDG Load Calculation
- IR 476280, Flow Rate Used in Calc
- PM-046 Is Non-Conservative
- IR 609922, Required Power Supply Analysis Not Performed
- IR 215452, Circuit Breaker to 343-SU Transformer
- IR 148966, App R Impact of Loss of CSR HVAC System
- IR 643320, Omission of Item from the Commitment Tracking Program
- IR 573736, License Renewal Commitment Identification Deficiencies
- IR 571536, Actions Required to Ensure Compliance with New SRBC Docket
- IR 163240, Conowingo Pond Level Management and SBO Line Vulnerabilities
- IR 736060, Loss of SBO Capability at Peach Bottom
- IR 571207, Bubbles in E3 Jacket Coolant Sight-Glass During Run
- IR 656655, E1 Diesel Running Alarm and Reset During Full Load Run
- IR 514214, Diesel Heat Exchanger Tube Plugging
- IR 527680, TRM Appendix B List of PCIVS Not Complete
- IR 569168, Exelon Versus Station or PECO Documents May Have Conflict
- IR 481490, Procedures Requiring RPS Test Boxes May Need Revision
- IR 570922, IPEEE Reference on Barrier Drawings Not Addressed in A-C-134
- IR 572347, Create Procedure Revision to Address Gas Intrusion
- IR 666004, NOS ID'd No PORC Reviewed Procedure for Containment Access
- IR 392563, Declaration of LPCI Inoperable While In Torus CLG Not Optimized
- IR 634709, Diesel Driven Fire Pump (DDFP) Operability Testing
- IR 637035, Unnecessary Testing
- IR 631157, Peach Bottom 4
th 10-Year IST Interval
- A-9IR
- 673505, Security Inattentiveness Allegation
- IR 473526, Maintenance Rule Performance Criteria Need Improvement
- IR 632012, Winter Readiness Critique 2006-2007
- IR 677383, Slop Drain MOD w/o Activities were Closed vs. Rescheduled
Section 4OA3: Event Followup
- IR 923239, 3 'A' Recirc Pump Trip (Include Root Cause Report) Procedure
- IC-11-02011, Revision 4, Recirc MG Set Voltage Regulator Tuning
- IR 925955, Inappropriate Action Identified During Root Cause Analysis Procedure
- GP-9-3, Revision 35, Fast Reactor Power Reduction Procedure
- OT-112, Revision 39, Unexpected/Unexplained Change in Core Flow Procedure
- GP-5-1, Exhibit - PBAPS Power Flow Operation Map PBAPS TS 3.8.7, Electrical Power Systems, Distribution Systems -
- Operating
- HU-AA-104-101, Revision 3, Procedure Use and Adherence
LIST OF ACRONYMS
PARS Publicly Available Records
A-10PBAPS Peach Bottom Atomic Power Station