ML20065N490

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Test Rept for Flux Wire Dosimeter Removed from Grand Gulf 1 at End of Cycle 1
ML20065N490
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 02/10/1987
From: Adamson R, Kessler L, Martin G
GENERAL ELECTRIC CO.
To:
Shared Package
ML20065N484 List:
References
NUDOCS 9012120160
Download: ML20065N490 (5)


Text

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SEN ER AL $ ELECTRIC FMT TPM SMITTAL NO. 87 212 0007 NUCLEAR FUEL & ENGINEERING SERVICES DEPARTMENT TUEL MATERIALS TECHN0thGY TEST REPORT DETERMINATION OF FAST NEUTRON FLUX DENSITY AND FLUENCE:

CRAND CULF NUCLEAR STATION UNIT 1 February 10, 1987 DPJ A00 02764 Prepared By:

  • b. b 1!'#/!87 Date G. C. Martin Fuel Materials Technology Reviewed By: <M f.t // A// 7 L. K. Kessler Date ruel Materials Technology Approved By: -

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1 *"~ I ) ~ 2 R.' B. Adamson, Manager Date Fuel Materials Technology i

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BETTP.MINATTON OF TAST NEUTRON TLUX DENSITY AND TLUENCE:

gP>SD CULT NUCLEAR STAT 10N UNIT 1

SUMMARY

The f ast neutron flux density and fluence (integrated neutron flux) at a capsule near the reactor vessel wall of the Grand Gulf Nuclear Power Station Unit 1 of Systems Energy Resources, Inc. have been determined to bei 8.9x108 n/cm2.s >l MeV full power flux density 1.4x10' n/cm .s 2 >0.1 MeV full power flux density 2.6x1028 n/cm 2 >l MeV fluence 4.2x1058 n/cm 2 >0.1 MeV fluence following the analysis of irradiated iron flux dosimeters, in accordance with the CF. CM6S Method No. 10.1.6.0 R3.

EXPERIMENTAL Three iron wires were irradiated in a CE pressure vessel capsule holder at Crand Gulf Unit 1 from September 25, 1983 (startup) to September 5, 1986 (end of cycle 1). Each wire was removed from the capsule, cleaned with 4N RS03 ,

weighed, mounted on a counting card, and analyzed for Mn 54 content at a calibrated 4 cm source to detector distance with 100 ce and 80 ec Ce(Li) detector systems.

From daily thermal power generation summary tables, the irradiation time periods were calculated. Operating days for each period and the reactor average power fraction are shovn in Table 1. Zero power days between fuel periods are also listed.

TABLE 1. prand Culf Unit 1 Irradiation Periods (Cvele li Percent of Between Period Period Date Daya Full Power

  • _Ilye (Days) 1 09/25/83 11/08/83 45 0.019 166 2 04/23/84 06/01/84 40 0.028 97 3 09/07/84 02/09/85 156 0.167 46 4 03/28/85 10/12/85 199 0.690 58 5 12/10/85 08/25/86 259 0.655 6

6 09/01/86 09/05/86 5 0.634

(*During operation.

Full power was 3B33 MWt .) 704 (Total) 0.460 (Av) 1 l

r l .

DISCUSSION OF PESULTS Trom the activity measurements and power history, reaction rates for 6*Te(n.p)5'Mn were calculated. These data appear in Table 2. The Grand Gulf Unit 1 >l MeV flux density reaction cross section for iron was calculated te be 0.187 barns. This value was obtained from measured cross section data functions from more than 65 spectral determinations for BVRs and for the General Electric Test peactor using activation monitors and spectral unfolding techniques. These data functions were applied to BVR pressure vessel locations based on water gap (fuel to pressure vessel) distances. The >l MeV/>0.1 MeV cross section ratio at BVR pressure vessel locations is approximately 1.6.

The determined full power flux density and actual fluence results at the Grand Gulf reactor vessel vall capsule holder location are given in Table 2. The >l MeV and >0.1 MeV values of 8.9x108 and 1.4x10' n/cm .s from the iron flux 2

monitors were calculated by dividing the reaction rate measurement data for the

  • *Te(n p)6 *Mn reaction by the 0.187 barn and 0.187/1.6 barn cross sections.

The corresponding fluence results, 2.6x10:e and 4.2x1088 n/ca' for >l MeV and

>0.1 Mev, respectively, were obtained by multiplying the full power flux density values by the product of the total seconds irradiated (6.08x10' s) and the full power reaction (0.480).

The 20 errors of the values in Table 2 are estimated to be:

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