GO2-14-090, Inservice Inspection Program Request 3ISI-16
| ML14188C079 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 06/24/2014 |
| From: | Javorik A Energy Northwest |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| GO2-14-090 | |
| Download: ML14188C079 (8) | |
Text
P.O. Box 96& Mai Dropl PE20 N RWTland.
WA 993520068 Ph. 509477-856 F. 509-77.4317 aqv~or&*enmcrxq/'=r,,oom June 24,2014 G02-14-090 10CFR 50.55a U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001
Subject:
COLUMBIA GENERATING STATION, DOCKET NO. 60497; INSERVICE INSPECTION (I"8) PROGRAM REQUEST 318116
References:
(1) Letter to Mr. Eric Leeds, Director, Office of Nuclear Regulation from Joe Donahue, NOE Action Plan Committee Chairman, dated February 05, 2014 (ML14045A361)
Dear Sir or Madam:
Section 50.55a of Title 10 of the Code of Federal Regulations requires that In Service Inspection (IS1) of American Society of Mechanical Engineers (ASME) Code Class 1, pressure retaining bolting greater than 2.0 inches in diameter (50.8 mm) be performed in accordance with Section XI, Article 1-2000 and Section Xl, Mandatory Appendix Viii, Supplement 8 of the ASME Boiler and Pressure Vessel Code. Pursuant to 10 CFR 50.55a(a)(3)(i) Energy Northwest hereby requests NRC approval of the proposed alternate to ASME Section Xl, Article 1-2000 and Section XI, Mandatory Appendix VIII, Supplement 8 to allow continued use of the Performance Demonstration Initiative (PDI) Appendix VIII, Supplement 8 bolting program, administered by the Electric Power Research Institute (EPRI). This alternative is requested for the third ten-year interval ISI program at Columbia Generating Station, which ends in December2015. The details of the 10 CFR 50.55a request are enclosed as Attachment 1.
Approval of request 31Sf-16 would allow continued use of the PDI bolting program administered by EPRI at Columbia Generating Station (Columbia) for ASME bolting examinations. Examinations performed in accordance with the requirements of the current PDI qualified bolting examination process provides Columbia reasonable assurance that flaws of safety significance wifl be detected consistent with the intent of the Code requirements.
9 L(
COLUMBIA GENERATING STATION, DOCKET NO. 504397 INSERVICE INSPECTION (PSI) PROGRAM REQUEST 31S1-16 Page 2 Energy Northwest requests approval by March 15, 2015 to accommodate application of the request during the next refueling outage. If approved, examinations performed in accordance with the requirements of the current PDI qualified bolting examination process provides Columbia reasonable assurance that flaws of safety significance will be detected consistent with the intent of ASME Code requirements.
There are no new commitments made in this submittal. If you have any questions or require additional information, please contact Lisa Williams at 509-377-8148.
Executed this day of
.20.
Respectfully, A. L. Jav4 "
Vice President, Engineering
Attachment:
(1) 10 CFR 50.55a Request Number 31S1-16 cc:
NRC RIV Regional Administrator SK Mitra, NRC NRR Project Manager NRC Sr. Resident Inspector - 988C.
MA Jones - BPA/1 399 WA Horin - Winston & Strawn
INSERVICE INSPECTION (ISI) PROGRAM REQUEST 31S1-16 Page 1 of 6 10 CFR 50.55a Request Number 31S1-16 Proposed Alternative In Accordance with 10 CFR 50.55a(a)(3)(i)
Alternative provides an acceptable level of quality and safety
- 1. ASME Code Component(s) Affected
==
Description:==
Reactor Pressure Vessel (RPV) Closure Studs, Reactor Recirculation (RRC) Pump Studs, and Reactor Recirculation Valve Studs ASME Code Class:
Examination Category:
Item Number:
Components Affected:
Class I B-G-1 (Pressure Retaining Bolting, Greater Than 2 inches in Diameter)
B6.20, 86.180 and B6.210 Identification No RPV STUD 35-1-1A RPV STUD 35-1-2A.
RPV STUD 35-1-3A RPV STUD 35-1-4A RPV STUD 35-1-5A RPV STUD 35-1-6A RPV STUD 35-1-7A RPV STUD 35-1-8A RPV STUD 35-1-9A RPV STUD 35.1-10A RPV STUD 35-1-1A RPV STUD 35-1-12A RPV STUD 35-1-13A RPV STUD 35-1-14A RPV STUD 35-1-15A RPV STUD 35-1-16A RPV STUD 35-1-17A RPV STUD 35-1-18A RPV STUD 35-1-19A RPV STUD 35-1-20A RPV STUD 35-1-21A Description RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD Category B-G-1 B-G-1 B-G-1 B-0-1 B-G-1 B-G-1 B-G-1 B-0-1 B-G-1 B-G-1 B-G-1
-G.1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 8--G1 B-G-1 B-G-1 Item 8S.20 B6.20 B6.20 B6.20 86.20 B6.20 B6.20 B6.20 86.20 B6.20 B6.20 B6.20 136.20 B6.20 86.20 B6.20 B6.2o B6,20 B6.20 B6.20 836.20
INSERVICE INSPECTION (ISI) PROGRAM REQUEST 31S1-16 Page 2 of 6 Identification No RPV STUD 35-1-22A RPV STUD 35-1-23A RPV STUD 35-1-24A RPV STUD 35-1-25A RPV STUD 35-1-26A RPV STUD 35-1-27A RPV STUD 35-1-28A RPV STUD 35-1-29A RPV STUD 35-1-30A RPV STUD 35-1-31A RPV STUD 35-1-32A RPV STUD 35-1-33A RPV STUD 35-1-34A RPV STUD 35-1-35A RPV STUD 35-1-36A RPV STUD 35-1-37A RPV STUD 35-1-38A RPV STUD 35-1-39A RPV STUD 35-1-40A RPV STUD 35-1-41 A RPV STUD 35-1-42A RPV STUD 35-1-43A RPV STUD 35.1-44A RPV STUD 35-1-45A RPV STUD 35-1-46A RPV STUD 35-1-47A RPV STUD 35-1-48A RPV STUD 35-1-49A RPV STUD 35-1-50A RPV STUD 35-1"5fA RPV STUD 35-1-52A' RPV STUD 35-1-53A RPV STUD 35-1-54A RPV STUD 35-1-55A RPV STUD 35-1-56A RPV STUD 35-1-57A RPV STUD 35-1-58A RPV STUD 35-1-59A RPV STUD 35-1-60A Description RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD R4PV STUD RPV STUD RPV STUD APv STUD-RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD Category B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 1-G-1 B-G-1 B-0-1 B-G-1 B.G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 B-G-1 8-G-1 6-0-1 6B-G-1 6-0-1 B-G-1 B-G-1 B.G-1 B-G-1 B-G-1 B-G-1 B-G-1 8-G-1 B-G-1 B-0-1 B-G-1 8-0-1 B-G-1 8-G-1 B-0-1 Item B6.20 B6.20 B6.20 B6.20 B6.20 B6.20 B6.20 B6.20 B6.20 86.20 B6.20 86.20 B6.20 136.20 B6.20 66.20 B6.20 B6.20 86.20 B6.20 86.20 B6.20 66.20 B6.20 86.20 B6.20 B6.20 B6.20 86.20 B6.20 86.20 B6.20 86.20 B6.20 B6.20 B6.20 B6.20 B6.20 B6.20
INSERVICE INSPECTION (1SI) PROGRAM REQUEST 31S1-16 Attachment I Page 3 of 6 Identification No RPV STUD 35-1-61A
-RPV STUD 35-1 -62A RPV STUD 35-1-63A RPV STUD 35-1-64A RPV STUD 35-1-65A RPV STUD 35-1-66A RPV STUD 35-1-67A RPV STUD 35-1-68A RPV STUD 35-1-69A RPV STUD 35-1-70A
_r RPV STUD 35-1-71A RPV STUD 35-1-72A RPV STUD 35-1-73A RPV STUD 35-1-74A RPV STUD 35-1-75A RPV STUD 35-1-76A RRC-P-1A-BLT RRC-P-18B-LT.
RRC-V-60A-BLT RRC-V-608-BLT Description RPV sTUD _
RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD RPV STUD
.RPV STUD RPV STUD NRV STUD-RPV STUD RPV STUD RPV STUD PUMP STUDS PUMP STUDS VALVE STUDS VALVE STUDS Category
- Iter B-G-1
-B6.20 I
B-G-1 i
B6.20 8-G-1 86..20J
-0G-1 _
68.20 B-G-1 B6.20
.. G.1 B6.20 B-G-1 B6.20 I
B-G-1 B6.20-,
B-G-1 B6.20 1 136.20 -
1-44.
8136.20 8-G-1 86.20 B-G-1 B
B6.20 B-G-1 86.20 B-G-1 86.20 B-G-1 8 B6.180-B-G-1 I 86.180 B-G-1 86.210 B-G-1
_86.210
- 2. Afolicable Code Edition'and Addenda Columbia Generating Station ASME S cti n XIlCode is the 2001 Edition through the 2003 Addenda.
- 3. Apolicable Code Requirement" The requirements for examination and acceptance of ASME Class 1, pressure retaining bolting greater than 2.0 inches in diametei (50.8 mm) In subsection IWB-2500 of Section XI requires volumetric examination of 100% of the specified bolts and studs at each interval. The volumetric examinations Of these bolts and studs are performed with ultrasonic examination techniques.Section XI, Article 1-2000, requires that ultrasonic procedures, equipment, and personnel used to detect flaws in bolts and studs be qualified by performance demonstration in accordance with Section XI, Mandatory Appendix Viii, Supplement $.
- 4. Reason for Reauest Columbia Generating Station (Columbia) relies on the Performance Demonstration Initiative (PDI) Appendix VIII, Supplement 8 bolting program, administered by the
INSERVICE INSPECTION (IS1) PROGRAM REQUEST 31S1-16 Page 4 of 6 Electric Power Research Institute (EPRI), to satisfy the qualification requirements defined in ASME Section XI, Mandatory Appendix VIII, Supplement 8 for ultrasonic procedures, equipment, and personnel qualification used to perform the volumetric examinations required by ASME Section Xl, subsection IWB-2500.
In a letter dated February 5, 2014, between the Nuclear Regulatory Commission (NRC) and the industry Non Destructive Examination (NDE) Action Plan Committee Chairman, the industry provided a list of deviations of the PDi Appendix VIII, Supplement 8 bolting program from the ASME Section XI, Mandatory Appendix VIII, Supplement 8 requirements. (Reference 1) These deviations are as follows:
- 1) Specimen sets at EPRI may not meet the detailed specimen and scanning surface requirements outlined In Supplement 8, Paragraph 1.1(b) for all bolts and studs at all sites.
- 2) Bolting examination procedures qualified under the PDI program currently specify that expansion of the procedure to meet Supplement 8, Paragraph 1.1(b),
including modification of essential variables, can be performed during the demonstration on the site calibration mock-up. However, the procedures do not specifically require these on-site expansions to be performed in a blind fashion, as required in Supplement 8, Paragraph 2.0.
- 3) The PD! program specifies acceptance criteria for personnel qualification, which differs from those specified in Supplement 8, Paragraph 3.1. Specifically, the PDI program acceptance criteria require detection of at least 80% of the notches, with less than 20% false calls. Supplement 8, Paragraph 3.1 states, "Examination procedures, equipment, and personnel are qualified for detection when each qualification notch (as described in 1.1) has been detected and its response equals or exceeds the reporting criteria specified in the procedure."
The PDI program was designed to be implemented in two parts. Part I was the screening of personnel and qualification of the examination procedure and equipment. Part 2 was the use of site calibration standards that would expand these qualifications to the specific bolt or stud configuration on site. In order to satisfy the site demonstration requirement, the examination system (personnel, procedure, and equipment) would be demonstrated during the calibration, thus satisfying the requirements of paragraph 3.1.
- 4) The sum of the PD1 program bolting specimens used for the base qualification does not meet the requirements of Supplement 8, with regard to notch locations.
Specifically, Supplement 8, Paragraph 1.1(c) states, "These notches are required on the outside threaded surface." However, some of the actual plant bolt configurations only have threads on one end. Therefore the PDI program samples were designed to represent these configurations. This results in some of the Program specimens containing notches in areas where no threads exist. Not
INSERVICE INSPECTION (1S1) PROGRAM REQUEST 31S1-16 Page 5 of 6 accounting for unthreaded regions of a bolt or stud is considered a shortfall of Section XI.
Based on these deviations it is recognized that the PDI Appendix ViII, Supplement 8 bolting program does not strictly meet the ASME Section XI requirements for bolting examinations. This relief is sought to allow the use of the PDI bolting program as is despite the discrepancies, until the end of Columbia's third interval, which ends December 2015.
- 5. Prooosed Altemative and Basis for Use Columbia proposes continued use of the Performance Demonstration Initiative (PDI)
Appendix VIII, Supplement 8 bolting program, administered by the Electric Power Research Institute (EPRI), to satisfy the requirements defined in ASME Section XI, Mandatory Appendix VIII, Supplement 8 for ultrasonic procedures, equipment, and personnel qualification used to perform the volumetric examinations required by subsection IWB-2500 of ASME Section XI.
EPRI performed a technical assessment to evaluate the differences identified above and the following technical attributes were Identified and documented in Reference 1:
- 1) In the PDI bolting program, examination systems (personnel, procedure, and equipment) are qualified on a sample set that represents a wide range of the bolts or studs that exist in the fleet. This provides a challenging, robust qualification process.
- 2) The number of simulated flaws in the sample set exceeds the minimum required by ASME Section XI, Appendix VIII, Supplement 8. As such it represents a more significant challenge for qualification purposes.
- 3) The examiners are required to demonstrate all aspects of the procedure during the qualification, which assures they are capable of reliably performing the examinations on a variety of bolt sizes and geometric configurations.
- 4) The procedures require the use of calibration standards that are similar to the actual bolt or stud to be examined in the plant. These calibration standards have similar scan surfaces and are fabricated from similar material. This requirement is meant to satisfy the geometric and material requirements defined in the Code that are not addressed during the blind qualification.
- 5) The sensitivity for the examination is established using calibration notches of the same size and reflective area as those used to qualify the procedure and personnel during the blind qualification. This step provides added assurance that the examination system is capable of performing in a similar fashion on the specific bolt or stud to be examined.
INSERVICE INSPECTION (ISI) PROGRAM REQUEST 31S1-16 Page 6 of 6
- 6) The requirement to use calibration standards also enables the examiner to become familiar with the geometric responses that will be seen during the examination and helps them optimize the technique for the actual examination.
- 7) This calibration process also assures that the examiner has remained proficient in the specific examination they are going to perform.
Reference I summarizes the results of this evaluation by stating that the PDI Supplement 8 program developed by PDI utility members and administered by EPRI is based upon a sound technical position and is adequate to demonstrate examination systems (personnel, procedure, and equipment). The program utilizes a range of qualification specimens that are representative of many of the actual bolts or studs found in the plants. This qualification process Is consistent with other ASME Appendix VIII Supplements. In addition to the blind qualification process, Columbia maintains site calibration standards representing the plant-specific material and geometric bolting conditions to be used as part of the PDI calibration process. This is needed to fulfill the requirements specified in Supplement 8 and provides added assurance that the personnel are capable of resolving defects located in the examination volume.
Examinations performed In accordance with the requirements of the current PDi qualified bolting examination process provides Columbia reasonable assurance that flaws of safety significance will be detected consistent with the intent of the Code requirements.
Based on the information above, it is concluded that the PDI qualification procedure does not strictly comply with ASME Section XI, Appendix VIII, Supplement 8; however, it does provide an acceptable level of quality and safety.
- 6. Duration of Proposed Alternatvye The duration of this request is for the third inservice inspection interval ending December 12, 2015.
- 7. PrecedeolS
- None
- 8. References
- 1. Letter to Mr. Eric Leeds, Director, Office of Nuclear Regulation from Joe Donahue, NDE Action Plan Committee Chairman, dated February 05, 2014 (ML14045A361)