ML12275A378

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Xcel Energy Prairie Island Nuclear Generating Plant Meeting Presentation, Diesel Generator Voltage and Frequency Limits.
ML12275A378
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 09/27/2012
From:
Xcel Energy
To:
Plant Licensing Branch III
Wengert T
References
TAC ME9468, TAC ME9469
Download: ML12275A378 (28)
v • d • e


Text

tl Xcel Energy" RESPONSIBLE BY NATURETM Diesel Generator Voltage and Frequency Limits Prairie Island Nuclear Generating Plant Meeting September 27, 2012

RESPONSIBLE BY NATURE'*

Xcel partiCipants Jon Anderson - Regulatory Affairs Manager Rick Mella - Engineering Supervisor Paul Zamarripa - Engineering Supervisor

  • Dale Vincent - Regulatory Affairs Project Manager 2

(l Xcel Energye RESPONSIBLE BY N ATURE~

Agenda

  • Introductions Vincent
  • Meeting purpose Anderson
  • Background Vincent
  • Applicability of industry initiatives Vincent LAR scope Vincent
  • Proposed TS and Bases changes Vincent
  • Technical bases for changes Mella
  • Schedule Anderson
  • Conclusion 3

.( l Xeel Energy RESPONSIBLE HY NAIUKt**

Meeting Purpose

Proposed EDG SR changes Bases for changes 4

(l Xcel EhergyfP RESPONSIBLE BY NATURE'*

Background

EDG Frequency identified in CAP - 2006

+ AL 98-1 0 com pensatory measures

  • EDG Voltage identified in RIS - 2007

+ AL 98-10 compensatory measures

  • Meeting with NRC - June 2008
  • PWROG adopt issue - 2009 PWROG meeting with NRC - 2010 5

fl' Xce/'Energy RESPONSIBLE 8Y NATUKt'*

Background

(conti nued)

EDG Exigent LAR - October 2010

  • PWROG meeting with NRC - 2011
  • NRC Frequency submittal finding - 2011 EDG Voltage LAR - May 2012 6

RESPONSIBLE BY NATURE '*

Applicability of Industry Initiatives

+ SRs verify EDG operate at nominal voltage and frequency

+ Variation from nominal treated as uncertainty

+ Minimal impact on supplied loads and EDGs 7

RESPONSIBLE BY NATURE '*

Applicabi lity of Industry Initiatives (continued)

How does PINGP LAR align?

+ Assumes EDG operates at range extremes

+ Significant impact on supplied loads

+ Significant impact on EDGs 8

RESPONSIBLE BY NATURE'*

LAR Scope

  • EDG operating voltage
  • EDG operating frequency
  • Impact on supplied loads
  • Impact on EDGs AL 98-10 submittal

+ Not voluntary 9

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Proposed TS and Bases Changes (continued)

  • Current TS

+ ss Voltage lower voltage: 3740 VAC

+ SS Voltage upper voltage: 4580 VAC

+ SS Frequency lower limit: 58.8 Hz

+ SS Frequency upper limit: 61.2 Hz 11

y Xcel Energy RESPONSIBLE BY NATURE '*

Proposed TS and Bases Changes (continued)

  • Proposed TS

+ SS Voltage lower voltage: 4027 VAC

+ SS Voltage upper voltage: 4400 VAC

+ SS Frequency lower limit: 59.5 Hz

+ SS Frequency upper limit: 60.5 Hz 12

RESPONSIBLE BY NATURE'*

Tec hnical Bases for Changes 10 second limit

  • TS Surveillance Requirements Bases
  • Unit 1 EDGs, designed per AEC SG 9, licensed 1973 Unit 2 EDGs, designed per RG 1.9 R2, licensed 1992
  • Surveillance requirements defined in TS EDGs conservatively set> 90% V & 98% F
  • Integrated SI test demonstrates EDGs meet requirements 13

RESPON S IBLE BY NATURE'*

Technical Bases for Changes (continued)

  • Lower voltage limit

. 4027VAC

  • Within nominal rating of equipment
  • Protective relaying calculations
  • Degraded voltage se'tpoin't basis Ready to load relay @ V-Hz permissive bkr closure
  • PLC sequencing requires bus voltage> DV RIS [4027]

  • Lower limit DVR setting + error + RIS 96.8% [4027]
  • DV LL >94.5% used in DV calculation
  • Exceeds the region of degraded voltage 14

~ Xeel Energy RESPONSIBLE oy NAIUH~ '

  • Technical Bases for Changes (continued)
  • Upper voltage limit
  • 4400 VAC Equipment ratings within nominal Protective relaying 15

RESPONSIBLE BY NATURE'"

Technical Bases for Changes (cont inued)

ESF pump motor performance with proposed V&F limits

  • Motor terminal voltage affected
  • With 4027 VAC pumps operate within specification
  • Bus voltage remains above degraded voltage setpoint 16

RES P ONSIBL E BY NATURE'*

Technical Bases for Changes (continued)

  • ESF pump motor performance with proposed V&F limits (continued)

Frequency affects governed by affinity laws

  • Pump speed (S) proportional to frequency (F)
  • Discharge pressure proportional to pump speed squared (S2)
  • Re-performed thermal hydraulic analyses
  • +0.5 Hz - pumps not in run-out, flow rate not excessive

-0.5 Hz - Necessary flow rates attained 17

~. Xcel Energy~

RESPONSIBLE BY NATURE'*

echnical Bases for Changes (conti nued)

  • ESF Ventilation performance with proposed V&F limits
  • Evaluations in progress
  • Auxiliary Building Special Ventilation (ABSVS)
  • Containment ventilation
  • 05/06 EOG Room
  • Control Room Ventilation
  • Safeguards Screenhouse Ventilation 18

fl' Xcel Energy*

RES P 0 N SIB L E B Y N A 1 U R t ,.

Technical Bases for Changes (continued)

  • MOV performance with proposed V&F limits
  • MOV motor terminal voltage affected
  • Apply degraded voltage Adequate torque
  • MOVs will operate at lower voltage limit 19

R ES P ONSIBLE BY NATURE '"

Technical Bases for Changes (cont inued)

MOV performance with proposed V&F limits (continued)

  • MOV frequency effects (continued)
  • Analyses assumption +/-1.2 Hz
  • Upper frequency
  • Increase dP 4%

Acceptable results

  • Lower frequency
  • Travel speed
  • Actuation tirne
  • Adequa'te margin 20

(l Xcel Energy*

RESPONSIBLE BY N A T U RE '*

Technical Bases for Changes (continued)

  • Relay coordination and interface with TS 3.3.4 with proposed V&F limits
  • Calculations performed across 750/0 - 1100/0 of nominal 4kV motor rating
  • Coordination acceptable 21

(l' Xcel'Energy RESPONSIBLE BY NATURE '*

Technical Bases for Changes (continued)

  • EDG loading with proposed V&F limits
  • Unit 1 EDG Design Loading
  • Licensed under AEC SG 9 paragraph C2 guidance
  • 2000 Hr rating or 90% of 30 Min rating (3250 kW)

Limit of 2750 kW

  • Unit 2 EDG Design Loading
  • Licensed under RG 1.9 Rev 2 paragraph C2 guidance Predicted load < short-time rating
  • Limit of 5400 kW 22

RESPONSIBLE B Y NATURE'*

Techn ical Bases for Changes (continued)

  • EDG loading with proposed V&F limits
  • Evaluated loads for LOOP+SI Frequency 60.5 Hz
  • Applied affinity laws to inductive loads
  • All EOG adequately sized
  • 02 (Unit 1 Train B) least margin
  • 2555.68 kW load vs. 2750 kW rating 23

R ESPONSI B LE BY NA TU R E '*

Technical Bases for Changes (continued)

  • EDG loading with proposed V&F limits
  • Evaluated loads 'for SBa
  • All EOG adequately sized
  • 01 (Unit 1 Train A) least margin
  • 2711.81 kW load vs. 2750 kW rating 24

(I' Xeel Energy RESPONSIBLE BY NATURt" Technical Bases for Changes (continued)

EDG loading with proposed V&F limits (continued)

  • Unit 2 EDGs much more margin
  • Rated 5400 kW
  • Minimum fuel oil capacity evaluated 25

RESPONSIBLE BY NATURE '*

Schedule

  • LAR drafted Validation in progress
  • Adjust for meeting input
  • Plan to submit by end of year 26

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