ML100261546

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Relief Request I3R-13 Associated with Pressure Testing of the Primary Containment Instrument Gas (PCIG) Piping
ML100261546
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 01/22/2010
From: Cowan P
Exelon Generation Co, Exelon Nuclear
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML100261546 (8)
v • d • e


Text

Exelon Nuclear www.exeloncorp.com 200 Exelon Way Nuclear Kennett Square, PA 19348 10 CFR 50.55a January 22, 2010 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Units 1 and 2 Facility Operating License Nos. NPF-39 and NPF-85 NRC Docket Nos. 50-352 and 50-353

Subject:

Relief Request 13R-13 Associated with Pressure Testing of the Primary Containment Instrument Gas (PCIG) Piping Attached for your review is a relief request associated with the third 10-year intervallnservice Inspection (lSI) Program for Limerick Generating Station (LGS), Units 1 and 2. Specifically, this relief request concerns pressure testing of the Primary Containment Instrument Gas (PCIG) piping. The third 1O-year interval began on February 1, 2007, and will conclude on January 31, 2017.

We request your approval by January 22, 2011. No regulatory commitments are contained in this letter.

Should you have any questions concerning this letter, please contact Tom Loomis at (610) 765-5510.

Re:1detf~,

9'0 If tf!;Y~(JL(

Pamela B. Cowan Director - Licensing & Regulatory Affairs Exelon Generation Company, LLC

Attachment:

Relief Request 13R-13 cc: USNRC Region I, Regional Administrator USNRC Senior Resident Inspector, LGS USNRC Project Manager, LGS R. R. Janati, Bureau of Radiation Protection

Attachment Relief Request 13R-13

Relief Request 13R-13 From Pressure Testing of the Primary Containment Instrument Gas (PCIG) Piping In Accordance with 10 CFR 50.55a(g)(5)(iii)

(Page 1 of 3) 1.0 ASME CODE COMPONENTS AFFECTED Code Class: 3

Reference:

IWD-2500, Table IWD-2500-1 Examination Category: D-B Item Number: D2.10

Description:

Primary Containment Instrument Gas Component Number: HCC-135, HCC-235 Instrument gas lines HCC-135 between and including valves HV-059-151A, SV-059-150A, 059-1138, 059-1120A-1, 059-1120A-2, and 059-1120A-3. (P&ID ISI-M-59, Sheet 1)

Instrument gas lines HCC-135 between and including valves HV-059-151B, SV-059-150B, 059-1119, 059-1120B-1, 059-1120B-2, and 059-1120B-3. (P&ID ISI-M-59, Sheet 1)

Instrument gas lines HCC-235 between and including valves HV-059-251A, SV-059-250A, 059-2138, 059-2120A-1, 059-2120A-2, and 059-2120A-3. (P&ID ISI-M-59, Sheet 3)

Instrument gas lines HCC-235 between and including valves HV-059-251 B, SV-059-250B, 059-2119, 059-2120B-1, 059-2120B-2, and 059-2120B-3. (P&ID ISI-M-59, Sheet 3)

See Enclosure 1 for ISI-M-59, Sheets 1 and 3.

2.0 APPLICABLE CODE EDITION AND ADDENDA The Limerick Generating Station (LGS), Units 1 and 2 third interval Inservice Inspection (lSI) Program is based on the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel (B&PV) Code,Section XI, 2001 Edition through the 2003 Addenda with errata. The third lSI interval began on February 1, 2007 and will conclude on January 31, 2017.

3.0 APPLICABLE CODE REQUIREMENTS Table IWD-2500-1, Examination Category D-B, Item Number D2.1 0, requires all Class 3 pressure retaining components be subject to a system leakage test with a VT-2 visual examination in accordance with Paragraph IWD-5210. This pressure test is to be conducted once each inspection period.

4.0 REASON FOR REQUEST Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from the performance of system leakage tests and VT-2 visual examination requirements specified in Table IWD-2500-1 for Class 3 Primary Containment Instrument Gas (PCIG) piping.

Relief Request 13R-13 From Pressure Testing of the Primary Containment Instrument Gas (PCIG) Piping In Accordance with 10 CFR 50.55a(g)(5)(iii)

(Page 2 of 3)

The PCIG system is pneumatic; therefore, the Code-required VT-2 visual examination would require the application of a leak detection solution to the subject piping and components. Much of this piping is 20 to 30 feet above floor level and is inaccessible as a result of it being routed through walls, in close proximity to sensitive plant equipment and other equipment obstructions, resulting in an inability to perform a complete VT-2 visual examination of the pressurized piping. A system leakage test and VT-2 visual examination of the Unit 2 PCIG piping, which includes approximately 500 feet of small bore piping, was performed on December 17, 2009. Approximately 39% of the "A" loop and 68% of the "B" loop piping was inaccessible for inspection. No scaffolding was used for this inspection; however, even with scaffolding, 100% inspection could not be obtained. No indications were identified during the VT-2 visual examinations. A walkdown performed on the Unit 1 piping determined that the inaccessible piping configuration for Unit 1 is similar to Unit 2.

5.0 PROPOSED ALTERNATIVE AND BASIS FOR USE As an alternative to the examination requirements of Table IWD-2500-1, LGS, Units 1 and 2 will perform pressure decay testing once per inspection period, which is equivalent to the Code-required frequency.

The pressure decay test is performed by isolating and pressurizing the associated piping to the nominal operating pressure. The decay in pressure is then monitored through calibrated pressure instrumentation. If the acceptable pressure decay criterion is exceeded, additional investigation is performed to locate the leak.

The proposed pressure decay test will provide the same level of quality and safety as the VT-2 pressure testing required by the Code. The proposed pressure decay test will ensure an acceptable level of system reliability and structural integrity of the piping, which is the intent of the Code-required VT-2 pressure test.

6.0 DURATION OF PROPOSED ALTERNATIVE Relief is requested for the third 10-year interval of the lSI Program for LGS, Units 1 and 2. The third lSI interval began on February 1, 2007 and will conclude on January 31,2017.

7.0 PRECEDENTS Similar relief requests were approved in the following Safety Evaluation Reports:

1) Letter from R. Gibbs (U.S. Nuclear Regulatory Commission) to C. Pardee (Exelon Generation Company, LLC), "Clinton Power Station, Unit NO.1 -

Proposed Alternative Relief Request to Performance of System Pressure Test on Instrument Air Piping, Second Ten-Year Inservice Inspection Interval (TAC NO. MD4896)," dated December 13, 2007.

Relief Request 13R-13 From Pressure Testing of the Primary Containment Instrument Gas (PCIG) Piping In Accordance with 10 CFR 50.55a(g)(5)(iii)

(Page 3 of 3)

2) Letter from R. Gibbs (U.S. Nuclear Regulatory Commission) to C. Pardee (Exelon Generation Company, LLC), "LaSalle County Station, Units 1 and 2-Third 10-Year Intervallnservice Inspection Program Plan Request for Relief Nos. 13R-03, 13R-04, 13R-08, 13R-09 and 13R-10 for (TAC NOS. MD5459, MD5460, MD5390, MD5463, MD5464, MD5465, MD5466, MD5467, and MD5468)," dated January 30,2008 (Relief Request 13R-10).

Request for Relief 13R-13 From Pressure Testing of the Primary Containment Instrument Gas (PCIG)

Piping In Accordance with 10 CFR 50.55a(g}(5}(iii}

Enclosure 1 ISI-M-59, Sheets 1 and 3

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