ML14353A117

Request for Additional Information, Round 3, License Amendment Request to Revise Final Safety Analysis Report Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion

ML14353A117
Person / Time
Site:	Callaway
Issue date:	12/22/2014
From:	Lyon C Plant Licensing Branch IV
To:	Diya F Union Electric Co
Lyon C
References
TAC MF3202
Download: ML14353A117 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 22, 2014 Mr. Fadi Diya Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1- REQUEST FOR ADDITIONAL INFORMATION, ROUND 3 RE: REVISION TO FINAL SAFETY ANALYSIS REPORT STANDARD PLANT SECTION 3.6 FOR HIGH DENSITY POLYETHYLENE CRACK EXCLUSION (TAC NO. MF3202)

Dear Mr. Diya:

By application dated December 6, 2013, as supplemented by letters dated September 2 and December 11, 2014, to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to revise the Final Safety Analysis Report-Standard Plant (FSAR-SP) Section 3.6.2.1.2.4, "ASME

[American Society of Mechanical Engineers] Section Ill and Non-Nuclear Piping- Moderate-Energy," to include a new pipe crack exclusion allowance at Callaway Plant, Unit 1.

The NRC staff has determined that additional information, as requested in the enclosure, is needed to complete its review. These questions were provided to Mr. T. Elwood of your staff on December 19,2014. Please provide a response to the questions within 45 days of the date of this letter. If circumstances result in the need to revise the requested response date, please contact me at 301-415-2296 or via e-mail at Fred.Lyon@nrc.gov.

Sincerely, Carl F. Lyon, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

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

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 REQUEST FOR ADDITIONAL INFORMATION LICENSE AMENDMENT REQUEST TO REVISE FSAR-SP 3.6 UNION ELECTRIC COMPANY CALLAWAY PLANT, UNIT 1 DOCKET NO. 50-483 By application dated December 6, 2013 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML13340A775), as supplemented by letters dated September 2 and December 11, 2014 (ADAMS Accession No. ML14245A653 and ML143458052, respectively), to the U.S. Nuclear Regulatory Commission (NRC), Union Electric Company (dba Ameren Missouri, the licensee) submitted a license amendment request to revise the Final Safety Analysis Report-Standard Plant (FSAR-SP) Section 3.6.2.1.2.4, "ASME

[American Society of Mechanical Engineers] Section Ill and Non-Nuclear Piping - Moderate-Energy," to include a new pipe crack exclusion allowance at Callaway Plant, Unit 1.

The NRC staff has determined that the additional information requested below is needed to complete its review.

Fire Protection Branch (AFPB)-Callaway-MF3202-HDPE-RAI-9(d), Supplement 1 The NRC reviewed the information provided in the letter dated December 11, 2014. The response indicates that no insulation or fire barrier materials are used on the exposed High Density Polyethylene (HOPE) Essential Service Water pipe sections. For the Ultimate Heat Sink Penetration Room and the Yard Vault, the licensee assumes "whole room burn-up" to occur. Please provide additional information regarding the expectation of performance of the HOPE piping in these areas, given failure of unprotected HOPE material in a whole room burn-up scenario. If the HOPE piping fails, provide a technical discussion of how plant safety is assured in the event of whole room burn-up of these areas, including HOPE pipe failure of exposed HOPE piping.

Enclosure

• .. ML14353A117 *email dated OFFICE NRRIDORULPL4-1 /PM NRRIDORULPL4-1/LA NRR/DRA/AFPB/BC(A)*

NAME FLyon JBurkhardt AKiein (DFerumkin for)

DATE 12/22/14 12/19/14 12/22/14 OFFICE NRRIDORULPL4-1/BC(A) NRR/DORULPL4-1/PM NAME EOesterle FLyon DATE 12/22/14 12/22/14