ML20204A522

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Forwards Proprietary Reload Safety Evaluation,Beaver Valley Nuclear Plant Unit 1,Cycle 6. Rept Evaluates Reload Core Utilizing Wet Annular Burnable Absorber Rods.Rept Withheld
ML20204A522
Person / Time
Site: Beaver Valley
Issue date: 05/02/1986
From: Carey J
DUQUESNE LIGHT CO.
To: Tam P
Office of Nuclear Reactor Regulation
Shared Package
ML19298D960 List:
References
NUDOCS 8605120309
Download: ML20204A522 (2)


Text

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'At3 Telephone (412) 3934000 Nuclear Division P.O. Bm 4 Shippingport, PA 15077-0004 May 2, 1986 Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Attn: Mr. Peter S. Tam, Project Manager Project Directorate No. 2 Division of PWR Licensing - A Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, Licensing No. DPR-66 Cycle 6 Reload Safety Evaluation Report Gentlemen:

Enclosed are ten (10) copics of the Beaver Valley Power Station, Unit No. 1 Cycle 6 Reload Safety Evaluation Report (RSER). This report presents an evaluation of the Cycle 6 design which demonstrates that the core reload will not adversely affect the safety of the plant.

Duquesne Light Company has performed a detailed review of the Cycle 6 RSER including a review of the core characteristics to determine those parameters affecting all postulated accidents described in the UFSAR. The consequences of those incidents which could potentially be affected by the reload core characteristics were reanalyzed, and we have verified that the reanalysis were performed in accordance with the methodology described in WCAP-9272,

" Westinghouse Reload Safety Evaluation Methodology". The affects of the reload on the design basis and postulated incidents analyzed in the UFSAR were accommodated within the conservatism of the initial assumptions and are bounded by the current limits for three loop operation. The results of the two loop steam line break analysis were found outside the bounds of the previous safety analysis limits, however, this event was reanalyzed and the revised analysis confirmed that the DNB design basis was met for Cycle 6.

No Technical Specification changes are required as a result of the Cycle 6 reload design or the RSER.

As was done for the Cycle 5 reload core, the Cycle 6 RSER evaluates the reload core utilizing the Wet Annular Burnable Absorber (WABA) rods.

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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, Licensing No. DPR-66 Cycle 6 Reload Safety Evaluation Report

  • Page 2 The NRC approved dropped-rod methodology used for the Cycle 4 and Cycle 5 design evaluations was also used for the Cycle 6 design evaluation and confirmed that the DNB design basis is met for all dropped-rod events initiated from full power. Therefore, as in Cycle 4 and 5, no restrictions on rod control, either manual rod control or restricted rod insertion limits when in automatic rod control above 90% power are required for Cycle 6 operation.

The reload core design will be verified by performing the standard Westinghouse reload core startup physics tests. The results of the following startup tests will be submitted in accordance with Technical Specification 6.9.1.3:

1. Control rod drive tests and rod drop time measurements.
2. Critical boron concentration measurements.
3. Control rod bank worth measurement.
4. Moderator temperature coefficient measurements.
5. Startup power distribution measurements using the incore flux mapping system.

The Beaver Valley Onsite Safety Committee (OSC) and the Duquesne Light Company Offsite Review Committee (ORC) have reviewed this RSER and determined that the Cycle 6 reload core design will not adversely affect the safety of the plant and does not involve an unreviewed safety question.

Very truly yours, PAL / sos J. C4 y 4

'ce President, Nuclear Attachments cc: U. S. Nuclear Regulatory Commission (with 1 attachment) c/o Document Management Branch Washington, DC 20555 W. M. Troskoski, Resident Inspector U. S. Nuclear Regulatory Commission Beaver Valley Power Station Shippingport, PA 15077 4

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