ML110700585

Request for Additional Information Relief Request RR-04-05 Use of Alternative Pressure Testing Requirements for Service Water System Buried Piping Segments

ML110700585
Person / Time
Site:	Millstone
Issue date:	03/10/2011
From:	John Hughey Plant Licensing Branch 1
To:	Dominion Nuclear Connecticut
Shared Package
ml110700570	List: ML110700585
References
FOIA/PA-2011-0115
Download: ML110700585 (2)

Text

DRAFT OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION RELIEF REQUEST RR-04-05 USE OF ALTERNATIVE PRESSURE TESTING REQUIREMENTS FOR SERVICE WATER SYSTEM BURIED PIPING SEGMENTS DOMINION NUCLEAR CONNECTICUT, INC.

MILLSTONE POWER STATION, UNIT NO. 2 DOCKET NUMBER: 50-336 By letter dated July 29, 2010, as supplemented by letter dated August 5, 2010 (Agencywide Document Access and Management System (ADAMS) Accession Nos. ML102580204 and ML102220527, respectively), Dominion Nuclear Connecticut, Inc. (DNC or the licensee),

submitted relief requests for the fourth 10-year inservice inspection (ISI) interval program at Millstone Power Station, Unit No. 2 (MPS2). DNC requested the use of alternatives to certain American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code),

Section XI requirements. Included in this request was Relief Request RR-04-05, which requests the use of alternative pressure testing requirements for service water system buried piping segments. The request is for the fourth 10-year ISI interval which began on April 1, 2010, and is scheduled to end on March 31, 2020 The U.S. Nuclear Regulatory Commission (NRC) staff has reviewed the information provided by the licensee in request RR-04-05 and has determined that the following additional information is needed in order to complete the review.

1. The P&ID that is included with the relief request shows buried piping and 4 flow elements in grid coordinate C-13.

a. Is the buried piping indicated in grid coordinate C-13 the only piping being covered in this relief request, or is the 24-KE-1 piping (flagged on the P&ID) in tunnels also being covered?

b. Are the flow elements downstream of the buried piping in grid coordinate C-13 the flow elements used for pump inservice testing (IST) surveillance?

c. Are there piping segments, covered by this relief request, that are downstream of the flow elements used for pump IST surveillance and, if so, what means will be used to detect pipe leakage in these segments?

DRAFT

2. What is the total length of 24-KE-1 piping considered in this relief request?

3. Provide a brief summary of the 24-KE-1 lining inspection results and pipe leak history.

DRAFT