ML060950301

GALL AMP: XI.M6, BWR Control Rod Drive Return Line Nozzle (Audit Worksheet GALL Report AMP)

ML060950301
Person / Time
Site:	Vermont Yankee
Issue date:	03/22/2006
From:	Morgan M NRC/NRR/ADRO/DLR/RLRC
To:	Office of Nuclear Reactor Regulation
morgan M NRR/NRC/DLR/RLRC, 415-2232
Shared Package
ML060950189	List: ML060950195 ML060950215 ML060950218 ML060950220 ML060950224 ML060950235 ML060950250 ML060950258 ML060950262 ML060950269 ML060950271 ML060950277 ML060950279 ML060950284 ML060950290 ML060950301 ML060950311 ML060950323 ML060950328 ML060950331 ML060950347 ML060950351 ML060950356 ML060950364 ML060950370 ML060950372 ML060950375 ML060950540 ML060950549 ML060950559 ML060950567 ML060950570 ML060950573 ML060950579 ML060950582 ML060950587 ML060950596 ML060950606 ML060950610 ML060950620 ML060950624 ML060950629 ML060950632 ML060950634 ML060950637 ML060950645 ML061000078 ML061000090 ML061000096 ML061000101 ... further results
References
%dam200611, TAC MC9668
Download: ML060950301 (4)

Text

AUDIT WORKSHEET GALL REPORT AMP PLANT: ______________________________

LRA AMP: __________________________ REVIEWER: ______________________

GALL AMP: XI.M6, BWR Control Rod Drive Return Line Nozzle DATE: __________________________

Program Auditable GALL Criteria Documentation of Audit Finding Element Program A. This program includes (a) enhanced inservice inspection (ISI) Consistent with GALL AMP: Yes No Description in conformance with the American Society of Mechanical Document(s) used to confirm Criteria:

Engineers (ASME) Code,Section XI, Subsection IWB, Table IWB 2500-1 (2001 edition including the 2002 and 2003 Addenda) and the recommendations of NUREG-0619, and Comment:

B. (b) system modifications and maintenance programs to Consistent with GALL AMP: Yes No mitigate cracking. The program specifies periodic liquid Document(s) used to confirm Criteria:

penetrant and ultrasonic inspection of critical regions of the boiling water reactor (BWR) control rod drive return line (CRDRL) nozzle.

Comment:

1. Scope of A. The program includes systems modifications, enhanced ISI, Consistent with GALL AMP: Yes No Program and maintenance programs to monitor the effects of cracking on Document(s) used to confirm Criteria:

the intended function of CRDRL nozzles.

Comment:

2. Preventive A. Mitigation occurs by system modifications, such as rerouting Consistent with GALL AMP: Yes No Actions the CRDRL to a system that connects to the reactor vessel. For Document(s) used to confirm Criteria:

some classes of BWRs, or those that can prove satisfactory system operation, mitigation is also accomplished by confirmation of proper return flow capability, two-pump operation, and cutting and capping the CRDRL nozzle without Comment:

XI.M6 BWR Control Rod Drive Return Line Nozzle 1

Program Auditable GALL Criteria Documentation of Audit Finding Element rerouting.

3. Parameters A. The aging management program (AMP) monitors the effects Consistent with GALL AMP: Yes No Monitored/ of cracking on the intended function of the CRDRL nozzles by Document(s) used to confirm Criteria:

Inspected detecting and sizing cracks by ISI in accordance with Table IWB 2500-1 and NUREG-0619.

Comment:

4. Detection A. The extent and schedule of inspection, as delineated in Consistent with GALL AMP: Yes No of Aging NUREG-0619, assures detection of cracks before the loss of Document(s) used to confirm Criteria:

Effects intended function of the CRDRL nozzles. Inspection recommendations include liquid penetrant testing (PT) of CRDRL nozzle blend radius and bore regions and the reactor vessel wall area beneath the nozzle, return-flow-capacity Comment:

demonstration, CRD-system-performance testing, and ultrasonic inspection of welded connections in the rerouted line. The inspection is to include base metal to a distance of one-pipe-wall thickness or 0.5 in., whichever is greater, on both sides of the weld.

5. Monitoring A. The inspection schedule of NUREG-0619 provides timely Consistent with GALL AMP: Yes No and Trending detection of cracks. Document(s) used to confirm Criteria:

Comment:

6. A. Any cracking is evaluated in accordance with IWB-3100 by Consistent with GALL AMP: Yes No Acceptance comparing inspection results with the acceptance standards of Document(s) used to confirm Criteria:

Criteria IWB-3400 and IWB-3500. All cracks found in the CRDRL nozzles are to be removed by grinding.

Comment:

7. Corrective A. Repair is performed in conformance with IWB-4000 and Consistent with GALL AMP: Yes No Actions replacement in accordance with IWB-7000. As discussed in the Document(s) used to confirm Criteria:

appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, acceptable to address the corrective XI.M6 BWR Control Rod Drive Return Line Nozzle 2

Program Auditable GALL Criteria Documentation of Audit Finding Element actions.

Comment:

8. A. Site quality assurance (QA) procedures, review and approval Consistent with GALL AMP: Yes No Confirmation processes, and administrative controls are implemented in Document(s) used to confirm Criteria:

Process accordance with the requirements of 10 CFR Part 50, Appendix B. As discussed in the appendix to this report, the staff finds the requirements of 10 CFR Part 50, Appendix B, acceptable to address the confirmation process and administrative controls. Comment:

9. A. See Item 8, above. Consistent with GALL AMP: Yes No Administrative Document(s) used to confirm Criteria:

Controls Comment:

10. Operating A. Cracking has occurred in several BWR plants (NUREG-0619 Consistent with GALL AMP: Yes No Experience and Information Notice 2004-08). The present AMP has been Document(s) used to confirm Criteria:

implemented for nearly 25 years and has been found to be effective in managing the effect of cracking on the intended function of CRDRL nozzles.

Comment:

XI.M6 BWR Control Rod Drive Return Line Nozzle 3

EXCEPTIONS Item Program Elements LRA Exception Description Basis for Accepting Exception Documents Reviewed Number (Identifier, Para.# and/or Page #)

1.

2.

ENHANCEMENTS Item Program Elements LRA Enhancement Description Basis for Accepting Enhancement Documents Reviewed Number (Identifier, Para.# and/or Page #)

1.

2.

DOCUMENT REVIEWED DURING AUDIT Document Number Identifier (number) Title Revision and/or Date 1.

2.

3.

4.

XI.M6 BWR Control Rod Drive Return Line Nozzle 4