ML20236R840

From kanterella
Jump to navigation Jump to search
Forwards Reload Safety Evaluation,Beaver Valley Nuclear Plant Unit 1 Cycle 7, Documenting Evaluation of Cycle 7 Reload Design,Including Affects of 10% Steam Generator Tube Plugging,Upflow Conversion & Thimble Plug Removal
ML20236R840
Person / Time
Site: Beaver Valley
Issue date: 11/12/1987
From: Sieber J
DUQUESNE LIGHT CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
Shared Package
ML20236R843 List:
References
NUDOCS 8711240058
Download: ML20236R840 (2)


Text

, _

y .w pp h, t.

t

' ,~pg Telephone (412) 393-6000 Nuclear Group

$n$p$*0 port. PA 15077-0004 '

November 12, 1987  ;

, :j.

U.: S. l Nuclear Regulatory . Commission iAttn: cDocument Control Desk.

LWashington, DC--20555

Reference:

. Beaver Valley Power Station,' Unit No. 1 H Docket No'. 50-334, License No. DPR-66 Cycle ~7 Reload Safety Evaluation Report

. Gentlemen:

-Enclosed are ten-(10) copies of the Beaver Valley Power Station,

Unit No. . 1 Cycle 7- Reload Safety Evaluation Report (RSER). This report Edocuments an evaluation of the Cycle 7 reload design-including
the affects of :10%. Steam Generator-Tube Plugging, Upflow Conversion
..and. Thimble ~ Plug Removal. Compared to the Cycle 6 reload fuel (Region '8 ) . the following design differences have been incorporated into the Cycle 7-reload fuel (Region 9):

'1)I Fuel pellet . stack holddown ' springs exert a 4G axial force

instead of a.6G axial force.

.2); Fuel pellets'have chamfered edges.

3) Integrated Fuel ~-Burnable Absorber (IFBA) rods are used in lieu of Wet: Annular Burnable Absorbers-(WABA).
4) ' IFBAL: fuel- rods- contain a lower . Helium backfill pressure compared to non-IFBA fuel rods to offset the effects of the Helium gas release'from the IFBA coating during irradiation.

z5): s Reload fuel has 6-inch axial blankets of natural uranium pellets that- are of. the same design as the enriched pellets except<that these pellets are not dished.

t Duquesne Light Company has performed a detailed review of the Cycle' 7 -RSER -including a review of the core characteristics to determine those parameters affecting the postulated accidents de' scribed- in the UFSAR.. The consequences of those incidents described in the UFSAR which could potentially be affected by the l reload core characteristics were reanalyzed, and we have verified '

that..the. reanalyses were performed in accordance with the NRC approved . methodology described in WCAP-9273-A, " Westinghouse Reload Safety Evaluation Methodology". The affects of the reload on the design basis and postulated incidents analyzed in the UFSAR were 4

i accommodated within the conservatism of the initial assumptions and do not. exceed any previously acceptable safety limits.

l l I

8711.240058 871112 DR ADOCK'O y4 lg

h[h, o

1

k. >

h '::Benv;r Dockit'No. VallGy PowLic 50-334, 3r Stntion, Unit No.

n23 No. DPR-66 J Cycle 17 Reload Safety Evaluation Report

, . Page-2 LNo Technical Specification Char.ges are required as a result of

'theLcycle'7 reload design or the RSER.

The NRC approved dropped-rod methodology used for previous cycle design evaluations' was also used for the Cycle 7 design evaluation and1 confirmed that- the DNB design basis is met for all dropped-rod

. events initiated from full' power. Therefore, no restrictions on rod Leontrol, either manual rod control or restricted rod insertion limits when in ' automatic rod control above 90% power are required for Cycle 17 ' 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 measurements.  !

a

'4.

~

Moderator temperature coefficient measurements.

5. Startup. . power distribution measurements using the 1 incore flux mapping system.

.The Beaver Valley Onsite Safety Committee (OSC) and the Duquesne 1 Light -company. Offsite Review Committee (ORC) have reviewed this RSER

.and determined that the Cycle 7 reload core design will not adversely ,

affect the' safety of the plant and does not involve an unreviewed i safety question.

Very truly yours, a

Lr

. D. Sieber Vice President, Nuclear

cc: Mr. F. I. Young, Sr. Resident Inspector (Unit 1)

Mr. W. T. Russell,-NRO Region I Administrator Mr. P. Tam,: Project Manager

_ _ _ - >