ML113060557

Request for Additional Information Related to Relief Request-A35 (RR-A35), Proposed Alternative to System Leakage Test Requirements

ML113060557
Person / Time
Site:	Davis Besse
Issue date:	11/03/2011
From:	Michael Mahoney Plant Licensing Branch III
To:	Allen B FirstEnergy Nuclear Operating Co
mahoney, m NRR/DORL/LPLIII-2 415-3867
References
TAC ME6056, RR-A35
Download: ML113060557 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001

'November 3, 2011 Mr. Barry S. Allen Site Vice President FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station Mail Stop A-DB-30S0 5501 North State Route 2 Oak Harbor, OH 43449-9760

SUBJECT:

DAVIS-BESSE NUCLEAR POWER STATION, UNIT. 1 - REQUEST FOR ADDITIONAL INFORMATION RELATED TO RELIEF REQUEST-A35 (RR-A35),

PROPOSED ALTERNATIVE TO SYSTEM LEAKAGE TEST REQUIREMENTS (TAC NO. ME6056)

Dear Mr. Allen:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated April 15, 2011, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML11109A119),

FirstEnergy Nuclear Operating Company submitted a relief request, RR-A35, "Proposed Alternative to System Leakage Test Requirements," for the Davis-Besse Nuclear Power Station, Unit 1. The licensee is proposing an alternative to the American Society of Mechanical Engineers Boiler and Pressure Vessel Code requirement to extend the pressure boundary of Class 1 components to the system boundary and perform a leak test at the end of an inservice inspection interval.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on October 20, 2011, it was agreed that you would provide a response within 30 days from the date of this letter.

B. Allen - 2 The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRC's goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-3867.

Sincerely, Michael Mahoney, Project Manager Plant licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-346

Enclosure:

Request for Additional Information cc w/encl: Distribution via Listserv

REQUEST FOR ADDITIONAL INFORMATION DAVIS-BESSE NUCLEAR POWER STATION, UNIT 1 DOCKET NO. 50-346 In reviewing the FirstEnergy Nuclear Operating Company's submittal dated April 15, 2011, related to RR-A35, "Proposed Alternative to System Leakage Test Requirements," for the Dayis-Besse Nuclear Power Station, Unit 1, the NRC staff has determined that the following information is needed in order to complete its review:

1. For the subject auxiliary pressurizer spray system Test Zone DH 16:

a. Provide a piping and instrumentation diagram and a piping isometric drawing.

b. What is the length of the auxiliary pressurizer spray line between RC51 and DH2735?

c. How many welded connections and what type (butt, socket) are in this segment?

d. What is the expected operating pressure of this segment when the reactor coolant pumps are stopped and the decay heat removal pump is operating?

2. Has there been a plant or industry history of degradation of the subject segments in Test Zones DH16 and RC01 by mechanisms such as stress corrosion cracking or fatigue?

Enclosure

ML113060557 NRR-088 OFFICE LPL3-2/PE LPL3-2/PM LPL3-21LA LPL3-2/BC NAME PHernandez MMahoney SRohrer JZimmerman(NDiFrancesco (JWiebe for) for)

DATE 11/03/11 11/03/11 11/03/11 11/03/11