ML20134E301

Application for Amend to License DPR-6,changing Tech Specs to Implement Reactor Operating Limits for Reload I1 Fuel

ML20134E301
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	08/16/1985
From:	Reynolds J CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20134E286	List: ML20134E284 ML20134E301 ML20134E311
References
NUDOCS 8508200143
Download: ML20134E301 (4)

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CONSUMERS POWER COMPANY Docket 50-155 Request for Change to the Technical Specifications License DPR-6 For the reasons hereinafter set forth, it is requested that the Technical Specifications contained in the Facility Operating License DPR-6, Docket 50-155, issued to Consumers Power Company on May 1, 1964, for the Big Rock Point Plant be changed as described in Section I below:

I. Changes A. Section 5.2.1(b) - Table 1

1. Change the last two column headings on Table 1 of Section 5.2.1(b) to read:

Reload

" Reload G3/G4/H1/

G1U H2/H3/H4"

2. Add new column heading six (with data under new column heading) to Table 1 of Section 5.2.1(b):

" Reload Il 1.59 392,900 322,100 Table 2 Figure 2 20 240 46 1,335 6

6 x 10 "

B. Section 5.2.1(b) - Table 2

1. Change the 5th, 6th, 7th, 8th (of 9) column headings on Table 2 of Section 5.2.1(b) to read respectively:

Reload

" Reload G3/G4 Reload Reload GIU H1 H2 H3/H4" 0500200143 050016 DR ADOCK O Q5 TS0B0885-0258-NLO4

s 2

2. Add new column heading ten (with data under new column heading) to Table 2 of Section 5.2.1(b):

" Reload Il 6.92 7.28 7.65 7.95 7.89 8.00 7.89 7.76 7.19 6.97 6.81 6.73 98 II. Discussion The above proposed Technical Specification changes are requested to implement reactor operating limits for Reload Il fuel. These reactor operating limits for Reload Il are based on the Loss of Coolant Accident I (LOCA) Analysis required by 10 CFR 50.46. The Maximum Average Planar Linear Heat Generation Rate (MAFLHGR) limits for Reload Il are based on l the LOCA Analysis submitted by Consumers Power Company letter dated March 7, 1979 (Exxon Nuclear Company (ENC) Report XN-NF-78-53). The l TSOB0885-0258-NLO4

3 MAPLHGR limits were derived in a manner identical to that described in ENC Report XN-NF-79-21, Revision 1, " Big Rock Point LOCA Analysis using the Exxon Nuclear Company WREM NJP-BWR ECCS Evaluation Model - MAPLHGR Analysis" which was submitted by Consumers Power Company letter dated February 25, 1980. On the basis of these two submittals the NRC staff previously issued Amendment No 44 to the Big Rock Point Operating License which revised MAPLHGR limits for all G3/G4 fuel supplied by ENC to that point in time. By letter dated December 15, 1981, Consumers Power Company requested a change to the Big Rock Point Technical Specifications regarding Exxon Reload H2 fuel MAPLHGR limits. On the basis of this submittal (December 15, 1981) the NRC staff issued Amendment No 53 to the Big Rock Point Operating License which revised MAPLHGR limits for Exxon Reload H2. In a similar manner, on the basis of a letter dated April 20, 1983 submitted to the NRC staff requesting an Exxon Reload H3 fuel MAPLHGR limits Technical Specifications updating, the NRC staff issued Amendment No 59. Finally, Amendment 61 was issued for Exxon reload H4 fuel MAPLHGR limits based on a letter submitted by Consumers Power Company dated September 7, 1983 to update the Technical Specifications.

Reload Il is identical to the previous G3/G4 reloads in all respects, except as described below.

1. In Reload 11, the fuel has a smaller pellet-to-clad gap than previous fuels.

2. In Reload II, the fuel has a higher helium prepressurization than previous fuels.

These minor differences have no effect on the thermal hydraulic design basis for ENC Il fuel. The changes in fuel design have been made to provide an improved heat transfer medium in the fuel rod, which results in lower stored energy which accounts for the higher MAPLHGRs (1-6%).

At higher burnups (27 GWD/STM), the higher prepressurization of the Il fuel design results in the tendency for rods to balloon and rupture which in turn, dictates lower allowed MAPLHGRs.

The changes to Table 1 and Table 2 column headings are editorial to allow space for the additional column for reload Il fuel.

III. Analysis of No Significant Hazards Consideration This proposed Technical Specification Change Request reflects changes resulting from reactor core reloading. The reload does not contain any fuel assemblies significantly different from those previously found acceptable by the NRC. The change does not involve a significant increase in the probability or consequences of an accident previously evaluated because the limits are derived in a manner identical to that described in Exxon Nuclear Corporation (ENC) report XN-NF-79-21, l revision 1, Big Rock Point LOCA Analysis using the ENC WREM NJP-BWR ECCS Evaluation Model - MAPLHGR Analysis. This report has previously been TSOB0885-0258-NLO4

4 reviewed and accepted by the NRC and has been used as a basis for issuing previous reload amendments. The change does not create the possibility of a new or different kind of accident from any previously evaluated because the XN-NF-79-21 report covers the required spectrum of break locations, sizes and configurations for the Big Rock Point Plant.

The change does not involve a significant reduction in the margin of safety because, as stated in the XN-NF-79-21 report, reactor operation within the proposed limits assures conformance with 10CFR50.46 criteria for maximum cladding temperature, metal-water reaction and hydrogen release. Consequently, this proposed change does not involve a significant hazards consideration.

IV. Conclusion The Big Rock Point Plant Review Committee has reviewed this Technical Specification Change Request and has determined that this change does not involve an unreviewed safety question and therefore involves no significant hazards consideration. This change has also been reviewed under the cognizance of the Nuclear Safety Board. A copy of this Technical Specification Change Request has been sent to the State of Michigan official designated to receive such Amendments to the Operating License.

CONSUMERS POWER COMPANY By I J W ReyrRflHB, Executive Vice President Energy Supply Sworn and subscribed to before me this 16th day of August 1985.

OuM C4 (_ LtA M Sherry L D cy,NotaryPqbi Jackson ounty, Michigan My commission expires November 5, 1986.

SHERRTLYNN DURFEY Notary Pubfic, Jackson Couaty, Mtett My Commission Expires Nov. 5,1986 TSOB0085-0258-NLO4