ML19116A268

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Core Operating Limits Report, Revision 26
ML19116A268
Person / Time
Site: Palo Verde Arizona Public Service icon.png
Issue date: 04/26/2019
From: Dilorenzo M
Arizona Public Service Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
102-07906-MDD/MSC
Download: ML19116A268 (31)
v • d • e


Text

Technical Specification 5.6.5.d Palo Verde Nuclear Generating Station 5871 S. Wintersburg Road Tonopah, AZ 85354 102-07906-MDD/MSC April 26, 2019 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station Unit 1 Docket No. STN 50-528 Unit 1 Core Operating Limits Report, Revision 26

Dear Sirs:

Pursuant to Palo Verde Nuclear Generating Station Technical Specifications, Section 5.6.5.d, enclosed is the Unit 1 Core Operating Limits Report, Revision 26, which was made effective April 19, 2019. Figure 3.2.4-2 was updated in this revision. A revision bar has been applied to the change.

No commitments are being made to the NRC by this letter. Should you need further information regarding this submittal, please contact Matthew S. Cox, Licensing Section Leader, at (623) 393-5753.

Sincerely, Digitally signed by Dilorenzo, Michael Dilorenzo, Michael D(Z99838)

DN: cn=Dilorenzo, Michael D(Z99838)

D(Z99838) Reason: I am approving this document Date: 2019.04.26 13:46:09 -07'00' Michael D. DiLorenzo Nuclear Regulatory Affairs Department Leader MDD/TMJ/mg

Enclosure:

Unit 1 Core Operating Limits Report, Revision 26 cc:

S. A. Morris NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS C. A. Peabody NRC Senior Resident Inspector for PVNGS A member of the STARS Alliance LLC Callaway Diablo Canyon Palo Verde Wolf Creek

Enclosure PVNGS Unit 1 Core Operating Limits Report Revision 26

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Reason: I am the author of this document C(Z95337) Date: 2019.04.16 13:08:45 -07'00' Digitally signed by Cowdin,

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FIGURE 3.1.1-1 SHUTDOWN MARGIN VERSUS COLD LEG TEMPERATURE REACTOR TRIP BREAKERS OPEN 7

6 (500, 5.0) 5 REGION OF ACCEPTABLE SHUTDOWN MARGIN (% K/K)

OPERATION 4

3 REGION OF UNACCEPTABLE 2

OPERATION 1

(350, 1.0) 0 0 100 200 300 400 500 600 COLD LEG TEMPERATURE (F) 3DJHRI

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FIGURE 3.1.2-1 SHUTDOWN MARGIN VERSUS COLD LEG TEMPERATURE REACTOR TRIP BREAKERS CLOSED 7

(500, 6.5) 6 REGION OF ACCEPTABLE 5

OPERATION SHUTDOWN MARGIN (% K/K) 4 (350, 4.0) 3 REGION OF UNACCEPTABLE 2

OPERATION 1

0 0 100 200 300 400 500 600 COLD LEG TEMPERATURE (F) 3DJHRI

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FIGURE 3.1.4-1 MTC ACCEPTABLE OPERATION, MODES 1 AND 2 0.5 (0%,0.5)

(100%,0) 0.0 (50%, 0.0)

-0.5 (100%,-0.2)

MODERATOR TEMPERATURE COEFFICIENT (x 104/°F)

-1.0

-1.5 MTC AREA OF ACCEPTABLE

-2.0 OPERATION

-2.5

-3.0

-3.5

-4.0 (0%,-4.4) (100%,-4.4)

-4.5 0 10 20 30 40 50 60 70 80 90 100 CORE POWER LEVEL

(% OF RATED THERMAL POWER)

Maintain Operation within Boundary TECH SPEC 3.1.4 Maximum Upper Limit 3DJHRI

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FIGURE 3.1.5-1 CORE POWER REDUCTION AFTER CEA DEVIATION*

20 20 16 100% to

>80% RTP 15 15 MINIMUM REQUIRED POWER REDUCTION 12 12 80% to

>70% RTP 10 10

(% OF RATED THERMAL POWER) 9 8 8 70% to

>45% RTP 6 6 5 5 4 4 4 45% RTP 3

3 2 2 1

0 0

0 10 20 30 40 50 60 TIME AFTER DEVIATION, MINUTES

  • WHEN CORE POWER IS REDUCED TO 35% OF RATED THERMAL POWER PER THIS LIMIT CURVE, FURTHER REDUCTION IS NOT REQUIRED.
  • NO POWER REDUCTION IS REQUIRED FOR A SINGLE CEA MISALIGNMENT IF THE FOLLOWING CONDITIONS ARE CONTINUOUSLY MET FROM THE TIME OF DEVIATION:

- > 95 % RATED THERMAL POWER

- COLSS IN SERVICE AND CEACS IN SERVICE

- AZIMUTHAL POWER TILT IS LESS THAN 3.0 %

- ALL CEAS REMAIN ABOVE 142.5" WITHDRAWN BY PULSE COUNTER AND ABOVE 140.1" WITHDRAWN BY RSPT INDICATION 3DJHRI

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FIGURE 3.1.7-1 CEA INSERTION LIMITS VERSUS THERMAL POWER (COLSS IN SERVICE) 1.0 NOTE:

See Footnote in Section 3.1.7 for applicability following a Reactor Power Cutback.

0.9 To meet the Transient Insertion Limit (TIL) all conditions below must be met:

0.8 CEA Groups 1 and 2 must be fully withdrawn* (see definition below) in MODE 1 and MODE 2.

AND CEA Group 3 must be fully withdrawn* for TRANSIENT INSERTION LIMIT FRACTION OF RATED THERMAL POWER 0.7 power levels 20%.

CEA Group 3 must be withdrawn 60" for power 0% and < 20%.

AND GROUP 5 60 INCHES CEA Group 4 must be fully withdrawn* for GROUP 5 108 INCHES 0.6 power levels 70.87%.

CEA Group 4 must be withdrawn the group 4 TIL (TIL4) as indicated on the graph or by the equation:

0.5 TIL4 = (172.5" x Fractional Power) + 25.5" (for power 20% and < 70.87%).

AND CEA Group 5 must be withdrawn the group 5 TIL (TIL5) as indicated on the graph SHORT TERM STEADY STATE INSERTION LIMIT 0.4 LONG TERM STEADY STATE INSERTION LIMIT or by the equation:

TIL5 = (172.5" x Fractional Power) - 64.5" (for power 37.39% and 100%).

0.3 0.2 GROUP 3 60 INCHES 0.1 0.0 GROUP 5 GROUP 3 GROUP 1 150* 120 90 60 30 0 150* 120 90 60 30 0 150* 120 90 60 30 0 GROUP 4 GROUP 2 150* 120 90 60 30 0 150* 120 90 60 30 0 CEA POSITION (INCHES WITHDRAWN)

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FIGURE 3.1.7-2 CEA INSERTION LIMITS VERSUS THERMAL POWER (COLSS OUT OF SERVICE) 1.0 NOTE:

See Footnote in Section 3.1.7 for applicability following a Reactor Power Cutback.

0.9 To meet the Transient Insertion Limit (TIL) all conditions below must be met:

0.8 CEA Groups 1 and 2 must be fully withdrawn* (see definition below) in MODE 1 and MODE 2.

AND CEA Group 3 must be fully withdrawn* for TRANSIENT INSERTION LIMIT FRACTION OF RATED THERMAL POWER 0.7 power levels 20%.

CEA Group 3 must be withdrawn 60" for power 0% and < 20%.

AND CEA Group 4 must be fully withdrawn* for GROUP 5 108 INCHES 0.6 power levels 54.97%.

CEA Group 4 must be withdrawn the group 4 TIL (TIL4) as indicated on the graph or by the equation:

0.5 TIL4 = (250.9" x Fractional Power) + 9.82" (for power 20% and < 54.97%).

GROUP 5 60 INCHES AND CEA Group 5 must be withdrawn the 0.4 group 5 TIL (TIL5) as indicated on the graph LONG TERM STEADY STATE INSERTION LIMIT or by the equations:

SHORT TERM STEADY STATE TIL5 = (250.9" x Fractional Power) - 80.18" (for power 31.96% and 75.00%).

TIL5 = 108" (for power lever 75.00%).

0.3 INSERTION LIMIT 0.2 GROUP 3 60 INCHES 0.1 0.0 GROUP 5 GROUP 3 GROUP 1 150* 120 90 60 30 0 150* 120 90 60 30 0 150* 120 90 60 30 0 GROUP 4 GROUP 2 150* 120 90 60 30 0 150* 120 90 60 30 0 CEA POSITION (INCHES WITHDRAWN)

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FIGURE 3.1.8-1 PART STRENGTH CEA INSERTION LIMITS VERSUS THERMAL POWER 0.0 10.0 20.0 30.0 PART STRENGTH CEA POSITION (INCHES WITHDRAWN) 40.0 50.0 60.0 70.0 TRANSIENT INSERTION LIMIT (75.0 INCHES) 80.0 (50% RATED THERMAL POWER) 90.0 OPERATION OPERATION UNACCEPTABLE RESTRICTED 100.0 110.0 LONG TERM STEADY STATE INSERTION LIMITS (112.5 INCHES) 120.0 130.0 OPERATION ACCEPTABLE 140.0 150.0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 FRACTION OF RATED THERMAL POWER 3DJHRI

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FIGURE 3.2.3-1 AZIMUTHAL POWER TILT VERSUS THERMAL POWER (COLSS IN SERVICE) 20.0 15.0 REGION OF UNACCEPTABLE OPERATION AZIMUTHAL POWER TILT (%)

10.0 5.0 REGION OF ACCEPTABLE OPERATION 0.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 CORE POWER LEVEL

(% OF RATED THERMAL POWER) 3DJHRI

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FIGURE 3.2.4-1 COLSS DNBR OPERATING LIMIT ALLOWANCE FOR BOTH CEACs INOPERABLE IN ANY OPERABLE CPC CHANNEL 25 (95, 20) 20 COLSS DNBR POWER OPERATION LIMIT REDUCTION 15

(% OF RATED THERMAL POWER) 10 5

(80, 5)

(70, 0) 0 50 60 70 80 90 100 CORE POWER LEVEL

(% OF RATED THERMAL POWER) 3DJHRI

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FIGURE 3.2.4-2 DNBR MARGIN OPERATING LIMIT BASED ON THE CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, CEAC(s) OPERABLE) 2.5 ACCEPTABLE OPERATION ANY POWER LEVEL AT LEAST 1 CEAC OPERABLE IN EACH OPERABLE CPC CHANNEL 2.4 (0.06, 2.38) (0.1, 2.38) 2.3

(-0.1, 2.28)

CPC MINIMUM DNBR 2.2 ACCEPTABLE OPERATION POWER AT OR ABOVE 90%

AT LEAST 1 CEAC OPERABLE IN 2.1 EACH OPERABLE CPC CHANNEL (0.08, 2.07) (0.1, 2.07) 2.0 (-0.1, 1.99)

UNACCEPTABLE 1.9 OPERATION 1.8

-0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 CORE AVERAGE ASI 3DJHRI

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FIGURE 3.2.4-3 DNBR MARGIN OPERATING LIMIT BASED ON THE CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, BOTH CEACs INOPERABLE IN ANY OPERABLE CPC CHANNEL) 3.6 ACCEPTABLE OPERATION ANY POWER LEVEL BOTH CEACs INOPERABLE 3.5 IN ANY OPERABLE CPC CHANNEL (0.0, 3.41) (0.1, 3.41) 3.4 CPC MINIMUM DNBR 3.3

(-0.1, 3.27) 3.2 UNACCEPTABLE OPERATION 3.1 3.0

-0.20 -0.15 -0.10 -0.05 0.00 0.05 0.10 0.15 0.20 CORE AVERAGE ASI 3DJHRI

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