L-02-115, Response to a Request for Additional Information in Support of License Amendment Requests Nos. 300 & 172

Response to a Request for Additional Information in Support of License Amendment Requests Nos. 300 & 172

ML023430155
Person / Time
Site:	Beaver Valley
Issue date:	12/02/2002
From:	Bezilla M FirstEnergy Nuclear Operating Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
L-02-115
Download: ML023430155 (30)

Text

-FE O Beaver Valley Power Station Route 168 PO Box 4 FirstEnergyNuclearOperatingCompany Shtppngport, PA 15077-0004 724-682-5234 Mark B. Bezilla Fax- 724-643-8023 Site Vice President December 2, 2002 L-02-115 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001

Subject:

Beaver Valley Power Station, Unit No. 1 and No. 2 BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 Response to a Request for Additional Information in Support of License Amendment Requests Nos. 300 and 172 This letter provides FirstEnergy Nuclear Operating Company (FENOC) responses to the Section 1.0 questions provided in the November 22, 2002 NRC Request for Additional Information (RAI) regarding License Amendment Requests (LAR) 300 and 172. The LARs were submitted by FENOC letter L-02-069 dated June 5, 2002. The changes proposed by the LARs will revise the Beaver Valley Power Station Units 1 and 2 Technical Specifications to permit each unit to be operated with an atmospheric containment.

The RAI requested FENOC to respond to the Section 1.0 questions by December 3, 2002, in order to support a planned December 11, 2002 meeting with the NRC staff. As discussed in the RAI, FENOC plans on providing the responses to Section 2.0 questions regarding the radiological assessment by January 24, 2003.

A list of regulatory commitments associated with the containment conversion project was submitted with FENOC letter L-02-069. Commitment number 6 states that FENOC will provide marked-up Updated Final Safety Analysis Report (UFSAR) pages reflecting the necessary changes associated with the conversion to an atmospheric containment. The UFSAR mark-up package was to be provided to the NRC by December 5, 2002.

However, additional time is needed to complete the UFSAR mark-up package. FENOC will submit the UFSAR mark-up package to the NRC by January 31, 2003.

Attachment B contains the commitments made in this letter.

As stated in Letter L-02-069, FENOC requests approval of the proposed amendments by July 15, 2003, to support implementation following the next scheduled refueling outage for Unit 2; i.e., 2R10.

Beaver Valley Power Station, Unit No. 1 and No. 2 License Amendment Request Nos. 300 and 173 L-02-115 Page 2 If there are any questions concerning this matter, please contact Mr. Larry R. Freeland, Manager, Regulatory Affairs/Performance Improvement at 724-682-5284.

I declare under penalty of perjury that the foregoing is true and correct. Executed on December o*__, 2002.

Sincerely, 01,/./

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Attachment Attachment A (continued)

L-02-115 Item 1.2.5. Provide MAAP5 momentum-driven velocity time history profiles for compartments using representative MSLB and LOCA cases (as above).

Response to Item 1.2.5.

The MAAP5 momentum-driven transient velocities for all containment nodes are provided in the attached Figures for the two representative sequences. The large LOCA sequence is the double ended hot leg break (case 8L-5 PP) and is shown in Figure 16 and the MSLB case (case 15M_N13_PP) is shown in Figure 17.

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Attachment A (continued)

L-02-115 Item 1.2.6. How are the MAAP5 water and steam discharges modeled? For instance, is the modeling represented as a pressure flash assumption with a percentage of water fallout going to the MAAP aerosol model?

How is the water aerosol model initialized or seeded for added water from the discharge? How does the aerosol dropout compare to the LOCTIC model for liquid water removal from the atmosphere?

Response to Item 1.2.6.

For the analyses performed in support of the Beaver Valley application for containment conversion, as well as for the CVTR, HDR, Battelle-Frankfurt and CSTF experimental benchmarks, the discharge into containment is specified by either a separate design basis mass and energy release calculation or experimental measurements. As such, the water and steam discharge into the MAAP5 containment model is a time dependent boundary condition for the calculation. The discharged water is flashed based on the containment's total pressure. All evaluations assume a small fraction of the remaining water mass (typically 5% of the water flow rate), which is user specified, as becoming initially airborne. This water mass is added to the airborne mass evaluated by the MAAP aerosol model, which has been benchmarked with numerous experiments (including the ABCOVE tests). For the CVTR experiment, the incoming mass flow rate is 100% steam, and therefore, has no initial blowdown water mass added to the airborne aerosol mass.

The MAAP5 aerosol depletion (dropout) of the water mass is mechanistically calculated by the deposition models discussed in the MAAP User's Manual. The computer code LOCTIC does not have an aerosol dropout model. In LOCTIC, at the end of each time step, the containment atmosphere inventories of mass and energy are updated to reflect heat and mass transfers due to sprays, sinks, and blowdown during the time step. If these inventories are seen to correspond to a saturated state, all water mass in excess of what can be vaporized is deposited as liquid on the floor.

Item 1.2.7. Are liquid water (aerosol), gas and vapor masses summed to define a fluid density for the compartment flow equations and momentum driven velocity equations?

Response to Item 1.2.7.

Yes, the liquid water (aerosol), noncondensible gas and vapor masses are summed to define the fluid density for the compartment flow equations and the momentum-driven velocity calculations.

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Attachment Attachment A (continued)

L-02-115 Item 1.2.8. Are quantities set in the parameter files in British units converted to the International System of Units (SI) in the code? Comment on the form of the ideal gas equation used for determining the accumulator nitrogen gas mass when accumulator volumes and gas temperatures are set according to British units. (See files Ul_MINACCUM_N2 and CONTAINMENT_IAR _TABLE.)

Response to Item 1.2.8.

Yes, the quantities set in the parameter files in British units are converted to SI units in the MAAP5 code. All input values are converted to SI for code execution (pressure in Pa, temperature in K, etc.); this conversion occurs before accumulator nitrogen masses are computed. Hence, the ideal gas equation is correct as written, i.e. PV = nRT.

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Attachment B to L-02-115 Commitment List The following table identifies those actions committed to by FirstEnergy Nuclear Operating Company (FENOC) for Beaver Valley Power Station (BVPS) Unit Nos. 1 and 2 in this document. Any other actions discussed in the submittal represent intended or planned actions by FENOC. They are described only as information and are not regulatory commitments. Please notify Mr. Larry R. Freeland, Manager, Regulatory Affairs/Performance Improvement, at Beaver Valley on (724) 682-5284 of any questions regarding this document or associated regulatory commitments.

COMMITMENT REFERENCE DUE DATE

1. Submit UFSAR mark-up package FENOC Letter January31, 2003 to the NRC. L-02-115 B-1