ML17228A459

Suppl 1 to Boric Acid Concentration Reduction Effort Technical Bases & Operational Analysis St Lucie Nuclear Power Plant Unit 1.

ML17228A459
Person / Time
Site:	Saint Lucie
Issue date:	09/30/1991
From:	ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY, ASEA BROWN BOVERI, INC.
To:
Shared Package
ML17228A456	List: ML17228A455 ML17228A457 ML17228A458 ML17228A459
References
CEN-353(F)-S01, CEN-353(F)-S1, NUDOCS 9403070179
Download: ML17228A459 (18)

Text

SUPPLEMENT 1 TO BORIC ACID CONCENTO TION REDUCTION EFFORT CEN-353(P)

TECHNICAL BASES AND OPERATIONAL ANALYSIS SAINT LUCIE NUCLEAR POWER PLANT UNIT 1 PREPARED FOR FLORIDA POWER &. LIGHT COMPANY BY ABB COMBUSTION ENGINEERING NUCLEAR SERVICES 9403070179 940222 PDR ADOCK OS00033S

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Boric Acid Concentration Reduction E ort. Su l. l CEN-353 F TABLE OF CONTENTS 1.0 PURPOSE AND SCOPE 2.0

SUMMARY

OF RESULTS 3.0 TECHNICAL BASES FOR REVISIONS

3. 1 REVISED BAMT VOLUME REQUIREMENTS 3.2 REVISED BASES SECTION 3/4.1.2 10 40 REFERENCES 12 TABLES TABLE 3-1 BAMT BORATION VOLUME TABLE 3-2 REQUIRED BAMT STORAGE VOLUME FIGURES FIG. 3-1 ST. LUCIE 1 MINIMUM BAMT VOLUME vs. STORED BAMT CONCENTRATION APPENDIX A TECHNICAL SPECIFICATION INPUT FOR ST. LUCIE UNIT 1 A-1 ABB Combustion Engineering Nuclear Services Page 2 of 12

Boric Acid Concentration Reduction E ort. Su l. 1 CEN-353(F

1.0 Purpose and Scope

The purpose of this Supplement to the Boric Acid Concentration Reduction (BACR) report is.to provide an adjustment to the Boric Acid Makeup Tank (BAMT) Volume and concentration requirements for the St. Lucie Unit 1 Technical Specifications Section 3.1.2.8. This adjustment is due only to revising an assumption that was made in the BACR Report, CEN-353(F), Rev 03.

This supplement modifies an original assumption that the BAMT would be needed as the source of fluid for depressurization of the RCS from 2200 psia to the High Pressure Safety Injection (HPSI) pump shutoff head. The depressurization would require additional inventory if the motor operated valve between the Refueling Water Tank (RWT) and the charging pump suction, V2504, failed to open automatically,and could not be opened manually. Once the depressurization occurred, the cooldown could be continued using fluid from the RWT. This revision now assumes that V2504 can be opened manually, therefore, the BAMT inventory needed to depressurize to the HPSI pump shutoff head is no longer required. This results in revision of the required BAMTboration volumes and the Technical Specification BAMT storage requirements.

This Supplement is applicable to St. Lucie Unit 1 only.

Revision of the BAMT Volume requirements will also result in a change to the BAMTvolumes listed in the Technical Specification BASES Section 3/4.1.2. The ll BASES values were presented on pages 32 and 33 of the report. In the report, the text of the Bases insert used the exact BAMT boration volume, rather than the ABB Combustion Engineering Nuclear Services Page 3 of l2

Boric rlcid Concelurntion Reduction E orr. Su l. i CEJV-353IF required storage volume. The BASES text was revised to correspond to the required storage volumes, which were conservative. Since the assumption change of this calculation revises the volume adjustment between the BAMT boration volume and the required storage volume, the BASES insert will be revised.

2.0 Summar of Results The proposed Technical Specification inputs for St. Lucie Unit 1 for Section 3.1.2.8 and BASES Section 3/4.1.2 are contained in Appendix A. The revised values supplied in Appendix A are derived in Section 3.1 and 3.2 below.

3.0 Technical Bases for Revisions 3.1 Revised BAMT Volume Requirements As stated above, the purpose of this supplement is to document the revision of the adjustment between the BAMT boration volumes and the Technical Specification BAMT storage requirements.

In the previous revision to this report, manual operation of V2504 (the motor operated valve between the RWT and the charging pump suction) was not assumed for a postulated failure to open automatically. Since RWT water would be riBB Colnbustion Engineering nuclear Services Pnge 4 of 12

Boric Acid Concentration Reduction E ort. Su l. 1 CEN-353(F unavailable through the CVCS for cooldown with V2504'closed, additional water inventory requirements were imposed on the BAMTs to allow for depressurization of the RCS down to HPSI shutoff head (1200 psia) using auxiliary spray. A volume adjustment of 1000 gallons was used, to cover the 905.9 gallons required for the depressurization (CEN-353(F), Rev.03, Page 29). The boration volumes were adjusted by rounding up to the next 50 gallons and then adding 1000 gallons to cover the depressurization volume.

Manual handwheel operation of motor operated valve V2504 is acceptable for St.

Lucie Unit 1 cooldown scenarios. Revising this assumption will make the St.

Lucie Unit 1 analysis agree with the Unit 2 analysis for this assumption. With manual operation of V2504, adjustment of the boration volume to include the volume for depressurization will no longer be required.

In CEN-353(F), Rev. 03, the BAMT boration volumes for each combination of BAMT and RWT concentrations was provided in Table 2-34 on page 73. These values are repeated in Table 3-1 below.

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Boric Acid Concentration Reduction E ort, Su l. i CEJV-353 F TABLE 3-1 BORIC ACID MAKEUP TANK MINIMUMBORATION VOLUMES VS STORED BORIC ACID CONCENTRATION FOR MODES 1, 2, 3 AND 4 MINIMUMVOLUME (GALLONS)

BAMT at RWT at RWT at RWT at RWT at RWT at wt  % 1720 1850 2000 2150 2300 ppm ppm ppm ppm ppm 2.50 8194.5 7703.9 7221.1 6714.5 6019.3 2.75 . 6966.8 6607.9 6129.9 5577.7 4946.8 3.00 6185.4 5689.8 5235.2 4769.9 4187.7 3.25 5406.0 5065.4 4594.0 4130.1 3650.9 3.50 4887.7 4535.6 4130.1 3713.2 3213.1 During the St. Lucie Unit 2 BACR analysis, 500 gallons were added to the BAMT boration volumes for conservatism. To be consistent with Unit 2, 500 gallons will be added to the St. Lucie Unit 1 BAMT boration volumes to define the revised Technical Specification BAMT Storage volume requirements. The boration volumes;vill be rounded up to the next 50 gallons, and 500 gallons will be added for conservatism. The resulting Required BAMT Storage Volumes are contained in Table 3-2 and are plotted in Figure 3-1. Figure 3-1 provides the revised storage requirements to replace Figure 2-6 on page 82 of the main report.

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Boric Acid Concentration Reduction E ort. Su I. l CEN-353/'F TABLE 3-2 MINIMUMBORIC ACID MAKEUP TANK VOLUME VS.

STORED BORIC ACID MAKEUP TANK CONCENTRATION MINIMUMVOLUME (GALLONS)

BAMT at RWT at RWT at RWT at RWT at RWST at wt,% 1720 1850 2000 2150 2300 ppm ppm ppm ppm ppm 2.50 8700 8250 7750 7250 6550 2.75 7500 7150 6650 6100 5450 3.00 6700 6200 5750 5300 4700 3.25 5950 5600 5100 4650 4200 3.50 5400 5050 4650 4250 3750 FP&L currently requests that only one curve be presented in the Required BAMT Volume curve, Technical Specification Figure 3.1-1, rather than the family of curves for various RWT concentrations. FP&L requests that only the curve for the RWT at 1720 ppm be provided. The new Technical Specification Figure 3.1-1 is contained in Appendix A.

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Boric Acid Concentration Reduction E ort. Su l. l CEN-353(F Since the new Required BAMT volumes can be contained in one tank for the full range of boric acid concentrations, some of the text for Technical Specification Section 3.1.2.8 can be deleted. When the volume requirement for the full range of concentrations could not fit in one tank, the current specification required a boric acid concentration between 3.2-3.5 weight percent. The revised specification is contained in Appendix A.

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Boric Acid Concentration Reduction E ort Su>~l. I CEN-353 F FIGURE 3-1 ST,LUCIE 1 IVIIN BAMTVOLUME vs STORED BAMTCONCENTRATION Q 7 g

~6 0

~5 2.6 2.8 3.0 3.2 3.4 3.6 STORED BAMTCONC (wt % boric acid)

~1720PPM ~1850PPM ~2000PPM ~2150PPM ~2300PPM IH RWT IN RWT IN RWT IN RWT IH RWT ABB Combustion Engineering Nuclertr Set vices Page 9 of l2

Boric Acid Concentration Reduction E ort. Su l. l CEN-353(F 3.2 Technical S ecification BASES Section 3/4.1.2 The Technical Specification BASES Section 3/4.1.2 was originally presented on pages 32 and 33 of CEN-353(F), Rev.03. The purpose of that section was to determine the new BAMT and RWT volume values for the Technical Specification BASES section. The section used the BAMT boration volumes as inputs to determine the required RWT volume for the cooldown depending on the BAMT concentration used. It also determined the RWT volume required if no BAMT volume was used.

While the actual BAMT Boration Volume values were used in the section, the revised text of the BASES Section should report the BAMT Storage Volume Requirements as the volume used. Since the BAMT Storage Volume Requirements are greater, this is conservative. The BAMT Storage Volumes are used to make the BASES Section consistent with the BAMT Storage Volumes contained in Figure 3.1-1 and Technical Specification Section 3.1.2.8'.

Since the Technical Specification BAMT Storage Volume Requirements were revised in Section 3.1 above, The BASES Section should be revised to correspond to the new BAMT Storage Volume Requirements. Since the BAMT Boration Volumes were used to calculate the RWT volume requirements, and the BAMT Boration Volumes have not changed, there is no need to revise the RWT volume requirements.

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Boric Acid Concentration Reduction E ort. Su l. l CEN-353 F The revised text for the BASES Section is as follows:

"The boration capability of either system is sufficient to provide a SHUTDOWN MARGIN from all operating conditions of 2000 pcm after xenon decay and cooldown to 200 degrees F. The maximum boration

'apability requirement occurs at EOL from full power equilibrium xenon conditions. This requirement can be met for a range of boric acid concentrations on the Boric Acid Makeup Tanks (BAMTs) and Refueling Water Tank (RWT). This range is bounded by 5400 gallons of 3.5 weight percent (6119 ppm boron) boric acid from the BAMTs and 17,000 gallons of 1720 ppm borated water from the RWT to 8700 gallons of 2.5 weight percent (4371 ppm boron) boric acid from the BAMTs and 13,000 gallons of 1720 ppm borated water from the RWT. A minimum of 45,000 gallons of 1720 ppm boron is required from the RWT if it is to be used to borate the RCS alone."

This text is contained in Appendix A.

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Boric Acid Concentration Reduction E ort. Suo l. l CEN-353(F J

4.0 REFERENCES

4.1 ABB-CE Calculation 607784-MPS-1CALC-001, Revision 00, "St. Lucie Unit 1 Input to Technical Specifications 3.1.2.8 and 4.1.2.8", dated 9/25/90.

4.2 ABB-CE Calculation F-MPS-CALC-002, Rev. 00, "Input to St. Lucie Unit 1 Technical Specification System Bases", dated 9/26/91.

4.3 St Lucie Unit 1 Technical Specifications, through Amendment 122, dated 5/03/93.

4.4 ABB-CE Calculation F-MECH-CALC-016, Rev. 00, "FP&L St. Lucie 1 Revision of Technical Specification Section 3.1.2.8 and BASES 3/4.1.2", dated 10/21/93.

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Boric Acid Concentration Reduction E ort. Su l. l CEN-353(F)

APPENDIX A Technical Specification Input for St. Lucie Unit 1 ABB Combustion Engineering Nuclear Services Page A-l of 5

Boric Acid Concentration Reduction E urt. Su r l. l CEN-353 F FIGURE 3.1-1 ST. LUCIE 1 lVIIN BAMT VOLUME YS STORED BAMT CONCENTRATION 9,000 ACCEPTABLE V) (8700)

OPERATION O 8,000 GJ CD (750 0)

~ 7,000

)I-O Z'6700)

~ e,ooo UNACCEPTABLE (6960)

OPERATION (6400) 5,000 2.4 2.6 2.8 3 3.2 3.4 3.6 (4646 PPM) (5245 ppM) (6g44 PPM)

(4196 PPM) (4896 PPM) (55g6 ppM) (62g4 ppM)

STORED BAMT CONC (wt % boric acid)

ST. LUCIE - UNIT I 3/4 1-1/

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