ML19309H642

Startup Physics Test Rept,Unit 2,Cycle 5 Startup.

ML19309H642
Person / Time
Site:	Prairie Island
Issue date:	03/11/1980
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML19309H637	List: ML19309H636 ML19309H642
References
NUDOCS 8005130584
Download: ML19309H642 (4)

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1.0 Introduction Section 6.7. A.1 of the Prairie Island Technical Specifications, Appendix A, specifies that a summary report shall be submitted following installation of fuel manufactured by a dif ferent fuel supplier. This report is to be submitted with 90 days following completion of the startup test program.

The Prairie Island Unit 2 reactor had 40 reload fuel assemblies manufactured by Exxon Nuclear Company installed in 1980 during the fourth refueling for that facility.

2.0 Startup Physics Tests - Introduction Reference 1 identified the startup related tests conducted for the Unit 1 Cycle 5 startup. Tests described in detail with analytical results in that report included the following -

(a) Zero Power Isothermal Temperature Coefficient (b) At Power Moderator Temperature Coefficient (c) Control Banks' Rod Worth (d) Critical Boron Concentration (e) Boron Worth (f) Power Distribution Measurements This report provides test results for the above tests conducted during the startup of Prairie Island Nuclear Generating Plant, Unit 2. The procedures used in the startup test program were the most recent revision reviewed by the Plant Operations Committee.

3.0 Startup Physics Tests - Results Table 1 summarizes the following data for each test performed.

(a) Test (b) Procedure /Ef fective Revision (c) Parameter (d) Measured Value (e) Acceptance Criteria 4.0 Summary The data presented in Table 1 show acceptable agreement with the acceptance criteria. The rod worths measured were less than the predicted values. This is attributed to a leakage current bias of the NIS detectors. Studies conducted indicate that when this bias was corrected for, the rod worth (for the bank retested) increased by approximately 9%, in very close agreement with the predicted value. Future startup physics testing will include correction for this leakage current bias.

5.0 Reference (1) Letter, L 0 Mayer (NSP) to J G Keppler (NRC) dated August 1, 1979.

Table 1 Unit 2 Cycle 5 Startup Test Results 1.0 HZP Isothermal Temperature Coef ficient Procedure: D32 Revision: 1 (9/6/79)

Test Condition Measured a(g,9 Acceptance Criteria ARO -3.45 pcm/F <0 pcm/F D -5.63 <0 D & C in -9.50 <0

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2.0 At Power Moderator Temperature Coefficient i Procedure: D51 Revision: 1 (9/6/79)

Test Condition Measured et d Acceptance Criteria 70-100% power -11.4 pcm/F <0 pcm/F (Actual 99.4%)

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3.0 Control Banks' Worth Measurements

Procedure: D30 Revision: 1 (9/6/79)

Test Condition Measured Worth Acceptance Criteria Control Bank D 591.4 pcm 671 pcm j; 15%

Control Bank C 1201.2 1265 pcm j; 15%

Control Bank B 632.2 714 pcm j;15%

j Control Bank A 2076.2 2316 pcm j;15%

All Control Banks 4501.0 4966 pcm j; 10%

4.0 Critical Boron Concentration Procedure: D34 Revision: 1 (9/6/79) .

Test Condition Measured Value Acceptance Criteria l All Rods Out 1499 ppm 1479 j; 50 ppm Din 1420 ppm 1395 j; 50 ppm D + C in 1280 ppm 1236 j; 50 ppm i

e 5.0 Differential Boron Worth Procedure: D30 Revision: 1 (9/6/79)

Test Condition Measured af B Acceptance Criteria

<All Control Banks > -8.54 pcm/ ppm -8.0 Pp "pm+ --10%

6.0 Power Distribution Measurements Procedure: SP2116 Revision: 4 (9/6/79)

Test Condition Parameter Measured Value Acceptance Criteria HZP, ARO Relative Fuel 6.2% Note 1 Assembly Pgwer 11.2% Note 2 F 2.33 Note 3 N

1,47 Note 4 R 1.014 <1.02 48% Power Relative Fuel 5.5% Note 1 As semb ly Pgwer 3.0% Note 2 F 1.965 Nate 3 Q

l.47 Note 4 hR 1.009 <1.02 100% Power Relative Fuel -6.2% Note 1 Assembly Pgwer 6.9% Note 2 F 1.717 Note 3 Q

l.431 Note 4 R 1.009 <l.02

-Note: (Acceptance Criteria for Power Distribution Measurement)

1. + 10% for [i10.9

2. + 15% for joi<0.9

3. 2.145 x K(z) where P = fraction of rated power unless P P< 0.5 in which case, P = 0.50

4. (1.55)x[1 + 0.2 (1-P)] x (1 - RBP (BU))

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Legend j HZP Hot Zero Power

ARO All-Rods Out ARI All Rods In l QPTR Quadrant Power Tilt Ratio NIS Nuclear Instrument System I

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