ML20140H340

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WO Work Plan WO 9612073, Removal/Replacement of Breakers 1Y-06-11
ML20140H340
Person / Time
Site: Point Beach  NextEra Energy icon.png
Issue date: 02/28/1997
From:
WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20140G761 List:
References
WO-9612073, NUDOCS 9705130081
Download: ML20140H340 (28)
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Text

{{#Wiki_filter:. WO WORK PLAN Removal /keplacement of breakers lY-06-11 WO9612073 UNIT I February 27,1997 1.0 PURPOSE This WO work plan provides direction for the removal of breaker lY-06-11 and replacement with Westinghouse EHD 101515 amp breaker. 2.0 INITIAL CONDITIONS

1. Reactor is offline.
2. Verify loads listed in Return to service step 16 can be taken OOS.
3. Permission has been granted to remove / replace breakers lY-06-11.

4. PPCS pulse totalizer / interposing relay alarms may come in if not in alarm. 3.0 ATTACilMENTS 3.1 Maintenance Electrical Safety Checklist, PBF-9044 form 3.2 Wire Removal Form, PBF 0036 4.0 REFERENCE DRAWINGS Wolf & Mann E 1241-E 5.0 MATERIALS Westinghouse EHD 1015 breaker (Quantity 1) P 9705130001 970505 PDR ADOCK 05000301 Page 1 of 4 I P PDR.

WO WORK PLAN Removal / Replacement of breaker 1Y-06-11 WO 9612073 UNIT 1 February 27.1997 Iloid Step Point No. Work Plan Description Worker Date 1 NOTE Breaker lY-06-11 provide power to Pulse totali:er/ Interposing relaysfor linit I & 2X01 & X02 Megawatt Outputs to computers & System Control Center. j g Verify initial conditions have been met. 7/rg/7 ' CAUTION

  • ALL COMPONENTS AND TERMINALS LOCATED IN Tile PANEL ARE ASSUMED TO BE ENERGIZED, TAKE NECESSARY PRECAUTIONS.

FME: General FME Statement: Tools and equipment shall be checked for loose parts and debris and temporary covers should be installed for foriegn material exclusion (FME) of system / components, per Exclusion of Foreign Material from Plant Components and systerru, NP 8.4.10. 2 Responsible Engineer to perform a pre-job briefing with all workers to include s2S97 scope of project, personnel safety, electrical safety checklist, and installation. RE 3 Pri r to installing the replacement breakers, cycle breakers five times per the 2 2p following directions; jg

1. Close breaker
2. Trip breaker using the trip to test button (red) on breaker.
3. Open breaker.
4. Use continuity checks to verify proper positioning of breaker contact on final cycle (closed, trip free, and open.

Acceptance Criteria: Closed _11 ohm / Open > 1 Mohm MTE AA/ AAA F Calibration Due Date 2- @ f 4 Verify thr,t breaker lY-06-il is in the "OFF" position OR coordinate with OPS '2 2 ?"7 to place breaker lY-06-Il in "OLg, MT3 1 ~ 5 Rem ve (if required)/Y-vo p nel c ver. ' Post panel with appropriate " Danger - MW g; >p.p) alive" placards and/or barricades as required. l 3,499, j Record wires removed on PB-0036 Wire Removal Form, then disconnect wiring 6 from breakers lY-06-il. g 1 j Remove breaker lY-06-li from panel. 77/17 MTN tb 8 Install the replacement Westinghouse EHD 1015 breakers in lY-06-ll. K1TN Bolt Size

  1. 8
  2. 10 1/4" Torque Value (in/lbs) 20 20 65 MTE //(., D -

Calibration Due Date Reconnect leads using attached PBF-0036 Wire Removal Form. 07f.9 9 MTN Page 2 of 4

] WO WORK PLAN I Removal / Replacement of breaker lY-06-11 WO 9612073 UNIT 1 February 27,1997 10 Torque the load side leads per the following step. ? JP/l MTN For breakers with capture wire connections, determine the wire size of the leads j cormected to the breaker and torque per the following table: Wire Size

  1. 14 to #10
  2. 8
  3. 6 to #4 i

Torque Value (in/lbs) 20 20 20 Record torque wrench MTE number and calibration date on the WO and work plan. ] ) Tb I l'b MTE Calibration oue Date NOTE Use calibrated digital voltmeterfor thefollowing step. POST M AINTENANCE TEST 2 y1i PSIT-11 A. Verify that each breaker reads 0 VAC on the load side of the breaker with MTN the breaker open. B. Verify that each breaker reads a nominal 120 VAC on the load side of the breaker with the breaker closed. Calibration Due Date 2' f/6 M 'd MTE FME: 12 Perform a Foreign Materials Exclusion inspection of panel to verify all tools and _' Hi'I2 foriegn materials are removed 'MTN 13 Reinstall panel cover. 7IS '27 MTN 14 Record all QAR, MTE and Lot numbers on WO. 7@N MTN lY-06-11 16 RETURN TO SERVICE TESTING Verify power to the following loadst 2 ffl97

1. Pulse totalizer / interposing relays for Unit 1 & 2X01 & X02 Megawatt Outputs to computers & System Control Center l

Page 3 of 4

4 WO WORK PLAN Removal / Replacement of breaker 1Y-06-11 WO 9612073 UNIT 1 February 27,1997 Comments: m l l Page 4 of 4 i

Point Beach Nuclear Plant WIRE REMOVAL LOG Sheet. of[ This log to be used when more than one wire is lifted at a time. 2.*]$$) o?

  • L 8 ~ W Restoration Date Removal Date NOTE: Use of thisform does nor supersede any of the requirements of PBNP 3.1.1 Independent Verification and Concurrent Checks.

1 Mll in the applicable block (s) Initials. Location T8 No. Wire No. Color Mrst Wire Wire Second } Person Removed Restored Person. 3 Check Check / bc, />//r // / Po6 H A Bkk I I f t 9 i l P i i Attach this form to the procedure or MWR. b/ O Other SMP/RMP/ICP No. MWR No, 4 l I P8F-0036 R2 vision : 04C9/94 N,

m _. - _ _ _.. UNIT: PB1 ADD / REVISE EQUIPMENT - DATA SCREEN 1 <<< System: Y

CH5101M 11/03/95 EQUIP ID: 'Y-06-11 Physical Lctn: 44/CB/CR WEST l

EQUIP NAME: PWR TO COMP / SCC PULSE TOTALIZER / INTERPOSING RLY OUTPUTS PARENT / EQUIPMENT ID: TRACKING ID: PB1 Y-06-11-AA Te:< t ID: PSI Te::t ID: Tracking Desc: PWR TO COMP / SCC PULSE TOTALIZER /INTE Tech Manual Ctl: l Equip Group: CKTBKR Equip Type: Resp Grout.: MTN WO No: 9612073 Mfg Code: WEST HESTINGHOUSE ELECTRIC CO. I l vendor Code: Model No: EHD1030 Serial No: 6629C92G07 i QA: N FP: N OPERABILITY CR REF: SDR: SDR-S-Y SR: N A/P: P Pre-Test: N SE-RPT: Appendi:< R: N EQ: N SSA: Y Post-Test: N EQ-RPT: Unit Shared: N CIV: N QA Codes: CMP: Safegrd Train: SEIS: 3 DSS Notification: Y Special Notification: LCO: N M-RULE: Y NPRDS: NPRDS (Y/N): Unit: Component ID: Utility ID: System ID: Utility System ID: PF2 - REPAIR COST PF6 - NEXT RECORD PF10 - PWR SUP PF20 - MODEL PF3 - EQ MENU PF11 OPEN WO PF22 - PSI TEXT PF4 - RESET PF8 - NEXT PAGE PF12 - DETAIL PF23 - TEXT PF5 - PREV RECORD PF9 - PREV SCREEN PF19 - BRWS TRK ID PF24 - HISTORY O i l D N b @O l l l

. - ~ I D ANGER TAG REOUEST i, '. Work Control Document # 94,/lb7Jf Time Date of application: ,1 -2(1ry ' /tMO Time /Date Tags Required: O Po '2 J2-4'd.- F7 l l Requesting Individual: Requesting Work Group: /77 TA) Responsible Supervisor: ELuv : d Me e. Estimated Job Completion (Time /Date): '/ der l l NOTE: If TS required equipment is to be disabled, the initiating work group shallinitiateforrn PBF-?l33. Equipment ID:. Y'-o (, -i I Unit: / Scope of Work: /e 4[c.a Mwk i i ' Additional Work Control Documents r Recommended Danger Tagging l Explanation: No Tags Reg'd: 7 Double Isolation: O Positive Control: O Grounding Req'd: O i Partial Removal Req'd: O i i i NOTE: The R.11P/lWP/S.\\tP/Mork OrderMork Plan may be referenced abovefor the recommended danger tagging. c i Rc(erences:. (NOTE:.\\1ust include Rev, numberfor controlled documents used to verify adequacy.) l 1 Information: 1 Appendix R: 0 Yes O No if yes, attach Fire Round Sheat Preparer: LCO Req'd: O Yes O No if yes, attach LCO Tracking Form PBF 9133 Date: ~ Reviewer Date Approver (SRO) Date NOTE.; Odditional reviews and approvals req'dfor changes or additions to original tagout. Describe changes in information section. Reviewer - Date Approver (SRO) Date Reviewer Date Approver (SRO) Date Danger Tags No Longer Required and Protected Worker Log Sign-Offs Complete Tag Series No 1 Responsible Supervisor Date j i l PDF-1906a. Revision 2 01/10/97 ] 1 I

i SRO Procedure and Non-Operations Work Plan Review All ITs, TSs, and Nen-Operations work plans on Maintenance Rule or Safety Related or DSS Noti 6 cation required work orders, to ensure they adequately establish initial conditions, equipment recovery actions (e.g. valve line-ups), and independent veri 6 cation of recovery actions. Problems identified are to be corrected before use. This form documents the required review has been completed. Procedure or Non-Operations work plan reviewed: LG C ' 9 <.- ( 2 0 '7.5 z(sef9 7 SRO (Reviewer) Date ) PBF 21O Revision 0 Ols:L97

=... Work Order / Document No. f/, / A o 7J t l Return to Service Testing Reviews j INITIALS Pre-Release / Pre or Post-RTS t t g,[a Work Group Post-Maintenance Testine { va.% 0- vueumsm o m a m er a j veam azo v u eo % sa,c.5se dim tueo 1 Iky7 t [ Section XI Eauirment Y [N3 v t Orierabilirv Testine l Jke. .S t es n #/G v "o. Inservice Testine Notte 8 ENGINEERING REVIEW ,l$bL l i ~ fl-SECTION XI ENGINEERING REVIEW Y .k'i{ t l l l PBF.2114 Revision 0 01/24/97

e POINT BEACil UNIT 2 RESTART COMMITMENT INDEPENDENT REVIEW RESULTS Commitment ID Number 57 Commitment Descrintmn I The following modification will be in an accepted status (i.e., the applicable physical work completed, post-I maintenance and return to service testing completed satisfactorily, and the associated component / system being declared operable) prior to being required to be operable per Technical Specifications: Modification 96-069 - replace four breakers (lY-06-01, lY-06-03, lY-06-05, and lY-06-11) associated with instmment bus lY-06. l This will resolve an issue where these breakers are oversized for the wiring they are protecting, creating a potential delay or lack of breaker tripping situation should a fault occur. l Review Methodology i Review modification with Responsible Engineer. Review modification scope, and if scope was changed, determine change rationale and if there is any safety impact. Review modification design and installation documents against scope. Identify and review documentation acceptance items. Verify that the documentation is adequate and that the documentation acceptance items have been completed and documented. Review the modification tests to verify that the tests, are appropriate and were successfully completed. i Determine if Condition Reports (CRs) were generated in performance of this modification and verify that they are ) documented / tracked. i Review Results The description of Commitment #59, identifies that the work associated with instrument bus lY-06 will be m an accepted status. He design and installation associated with the lY-06 bus is contained within the scope of MR 96-069'A. Therefore, this review will only review those documents created in support of partial modification MR 96-069'A. The modification was discussed with the Responsible Engineer (RE). No issues or concerns regarding the modification installation were identified by the RE. The modification package (MR 96-069'A); Safety Evaluation; and Work Plans for Work Orders 9612057,9612056, 9612072, and 9612073 were reviewed. The safety evaluation matched the modification final design and Work Plan (both in scope and content). The scope of the modification was not changed during installation. I Page 1 of 3 i

1 l POINT HEACil UNIT 2 RESTART COMMITMENT [ INDEPENDENT REVIEW RESULTS i I Commitment ID Number 57 The Safety Evaluation (SER 97-032) had pen and ink changes made to change the word " shutdown" to " hot or cold shutdown" condition. This change was not made consistently in the 50.59 cvaluation. The response for Question 2 & Question 6 did not have the pen and ink changes made consistent with the other question responses. The Technical Specifications define liot Shutdown based on Tm > 540F and Cold Shutdown based on Tm < 200F. Based on the Station Log, this ruodification was installed during a phase between hot and cold shutdown when Tm was approximately 345F. The Work Plan initial conditions required the Reactor to be offline. The Unit I condition and installation activities were discussed with the on-site RE and Operations. It was noted by both the RE and Operations that installation could be performed during any condition while the Reactor was shutdown. The Safety Evaluation discussion of the Unit 1 Plant condition, by definition, does not match the condition in which the I installation was performed or that which was required by the Work Plan. However, this does not represent a safety issue and will not impact Unit 2 restart. The on-site RE was made aware of this issue and was asked to take the necessary action to resolve the conflict. It was recommended that the RE discuss this issue with the MSS which approved the 50.59 to assure the intent of the pen and ink change was not made to avoid installation during the transition from hot to cold shutdown. In addition, it was suggested that the 50.59 cvaluation be revised to identify the installation condition as reactor shutdown. Verification of pen and ink changes to the Control Room /WCC documents was performed. The Document Update Sheet (DUS) identified that the only acceptance item for MR 96-069*A was pen and ink changes to the MDB 3.2.1I for the lYO6 panels. These changes have not been made to the MDB in either the WCC and Control Room prior to l the modification being accepted by the DSS and returned to service. The RE has been notified of this issue and has made the appropriate pen and ink changes to the MDB. This acceptance item has been verified completed. The DUS for MR 96-069'A identified that drawing revisions to the Westinghouse 499 series elementaries would be required for closcout of the modification. The Westinghouse 499 series elementaries, are changes that typically need to be completed as acceptance items to a modification. Based on a review of the drawings and discussion with the RE, the changes which are proposed (add the breaker size to the drawing) to Westinghouse drawings 499B466 Sh. 844, and Sh. 845, represent enhancements to the drawings and are not required to be classified as an acceptance item. Information regarding the installation / mounting of the breakers was not specific in detail. Questions specific to the ] SQUG program impacts and seismic mounting were raised with the RE. The RE noted that the replacement breakers l were physically hke-for-like (mounting, size, weight, etc.) to the old breakers. To address these concerns, the RE presented the modification details to the SQUG group. The SQUG group noted that the mounting and control panels evaluation would not be impacted based on the like-for-like replacem'ent. To document this review, the RE revised the Design Input Checklist (Section F.2) to note the conclusions of the SQUG group. Post-Maintenance Testing consisted of continuity, verification of breaker operation via voltage checks and functional testing (circuit operability checks) of equipment. The PMT actions have been satisfactorily completed and signed off. Based on the scope of this installation, these tests are appropriate PMT for the installation. Work Orders 9612056,9612057,9612072, and 9612073 and the associated work plans have been installed, tested and accepted by the DSS. Page 2 of 3

~ ~.. POINT BEACil UNIT 2 RESTART COMMITMENT INDEPENDENT REVIEW RESULTS i 1 t Commitment ID Number 57 No Condition Reports have been generated in performance of MR 96-069'A. This was concluded based on an electronic scarch of the NUTRK system using the Work Order numbers and Modification number as search criteria. No ECRs were generated in support of this modification. i l Conclusion i Based on this independent review, there are no other items involved with Restart Commitment #57 which would impede Unit 2 start up. i i 4 i 1 i: A i Reviewe -,d/h7 Page 3 of 3

..~ l ACTION ITEM STATUS REPORT PAGE 1 05/01/97 Responsible Person:

  • Trkid: U2R22 RESTART Urgency: Lm.o Work Priority:

99

  • Action Number: 59 l *******************************

{ Activity Pending is: DONE ASSOCIATED WITH A COMMITMENT

TITLE AND TASK DESCRIPTION------------------------------------------

Unit 2 Refueling 22 Startup Commitments Ensure modification MR 96-070 that replaces the molded-case circuit breakers associated with instrument buses 2Y-05 and 2Y-06 is complete. ____------DATES---------------------------------------------------- ion **---------- Source Record: 01/10/97

              • Evaluation ********* ****** Correct l! Commitment:

Eval Due: Corr Act Due: 02 11 97 Action Create: 01 13 97 Orig Eval Due: Orig CA Due: 02 11 97 Action Closed: 05 01 97 Eval Done: Corr Act Done:04 30 97 .---------PEOPLE-------------------------------------------------------------- Responsible for Overall Action: EIS Responsible for Current Pending Activity: Issue Manager: Initiator: Punchlist Administrator:

UPDATE--------------------------------------------------------------

,(01/28 _. Physical work is complete. PMT is complete. Pacerwork is in the/97 process of being closed out. Paperwork is scheduled to be completed by 02-08-97 (03/23/97

2) Passed to for acceptance of work.

(03/27/97 Returned to for additional work. (04/22/97 _) Passed to. ' for acceptance of work. (04/23/97 Returned to , for additional work. (04/30/97 Passed to ____ for acceptance of work. Passed to a for Verification. (04/30/97 This work is complete. The MOD nackage is with MOD engineer for paperwork close out. The MDB is updated. 03-23-97 The work was performea under MOD 96-070 with WOs 9612082 9612084 9612086, 9612087 9612088 and 9612094. No DCNs Reg-breaker sizes,are not reflected,on any dr, awing. The breakers are in service. The PMT was performed under the WO and is satisfactory for all breakers. This item can be closed out. 04-30-97 "'~ (04/30 -) Passed to A for Final Close Out. I Verifie/97d DSS signature and date on the Work Orders. This item is ready for closecut. (05/01/97 PLA Closure of Item. _________-REFERENCES---------------------------------------------------------- MR 96-070 CALC 96-0245 CALC 96-0262 CR 96-539 WO 9612082 WO 9612084 WO 9612086 WO 9612087 WO 9612088 WO 9612094

MISCELLANEOUS----------------------

Originating Agency: S stem: XX NRC Open Item Numer: N C Status: l Related Outaces: U2R22 l Engineering Work Type: None,Specified Person Hours: Original Estimate = i i Current Estimate = l Actual Hours = l

~ _ . u DESIGN CHANGE PACKAGE l MR No. UD - U7 U COVER SHEET l (WO if non: mod design changej laitimion:

Title:

Re,la ce bereje<< s 2 fcs et i f-CHAMPS System Code: [ Lier JM/76 t:e/ =1 M: C# 94 5_n Priority: 99 Cost Estimate: $56o Ptoject Objectives: fu /u, her, h c, dro5 g4,y-A g af,g f, y ' O'eust Drsisci ik C m o- ^tL* OfC Proposed Scope 8eru/co es l. S (. a nel /6 wJ s 1,, ,,4 e a,) w, ti 15 A,,, brea ka rr. -M . m. Initissed By: Date: /#//y/ft s r FDCH: (Ref. NP 7.2.1 C-~' y Sectid 4.2 for cot =pletion of this accten.) hodification Request (PBF 1605) O Non-Mod Design Change (Work Order) Check Applicable Design Controls: Carifications / Basis: l E Design Checklist (PBF-1584) E DUS (PBF-1606) % Design Verification (PBF-1583) O Working Drawings R ECRs* K Calculations O Specifications i f N Design hwaMoe (PBF-1585) 'Ok i:QV Z"\\fkl@A! 7 Q Check Applicable Project Controls: C:mfications / Basis: 1 ~ O Project Tema Required (Indicate===m groups j m request) i D e - ;+4 Package Required x 'i. O Budget Project # O Detail schedule F.eqiured i i hWP Requirst UDRM odOGR h/ORff 8L.6 6 D FDCH Rel [ M F O -

  • tuand (non-mod)

/ / /#!O!9k FDGH: Dae: { I I r s PDF-larf Reveien 0 04/ owe 6 Rsferusse(s): NP 7.2.1. PBF 1583.7BF.1584 FSF.lS85. F5F Isos

haa..., n CJ ~.. L ~ ~ ~ "n u. J5.:,. :s ^ T:. "... ; :." ^ ~ ^ ~ ~ --'. : ^% ~~-:.~.... ~ ' ^ ^ ^ "^ I 4 I , NUCLEAR FOWER SUSINESS UNIT MR NUMBER: 9kO7O MODIFICATION REQUEST l REPLACER 9Regens oN 2 Y-or/oc l TITtE: UNIT 10 UNIT 2 g cOxxONo l FINAL DESIGN GROUPHEAD -INITIALIZATION Assigned Project Manager: a PROJECT MANAGER - ESTABLISH PROJICT TEAM i Assiped Assigned Greue Reoresented .Te.mLMeqdg Groue Reeresented Team Member e S t=rd f I 1. PROJECT MANAGER Indicate all design packa6e information, if any, for the modification: THG GMT.TRG GCofG OF TH75 t100;FZChTJc)td W2LL 6g "r ta C L o o w r u Ar .S M GLC DesxCN PA li(AGE. PROJECT MANACEF I: Indicate any clarifica& . ages to design controls or project controls fem Desip Change Package Cover Sheet; i l I I i PSP 1605 Kgvision 2 11/01/96 I45e 1 of 3 RefuenscW: NP .2.1, NP 7.2 2

.na ~ s. ns.,.. a.v...i j ' PROJECT MANAGER. CONCEPTUAL DESIGN [ Check here if not required:( { Provide a cen:ise description of the conceptual desip. Lht all at: ached documents which defme the conceptual design. See corntnentary in NP 7.2.1 for addttional guidance. l l l l i ) l 1 I 1 Conceptual Design Cornplete: N / Project Manager Date GROUPHEAD CONCEPTUAL DESIGN REVIEW AND ACCEPTANCE Review conceptual design. Attach comments on NPBU Document Review Comment Sheet (PBF-1622) Cwup Acceptance Sienature Dag Comments 1 None O PBF-1622 ) Artsched O None PBF-1622 Acached None PBF 1622 Attached None PBF-1622 Attached O None O PBr-is22 At: ached O None O PBF 1622 Attached None O PBF 1622 Attached Q None PBF 1622 Attached P8F1605 Rcvision2 it/01/96 Page 2 of 3 Rerettnce(s): NP 72 t.NP 7.22

7. _ _.

q 4 i 4 i FLVA', DESIGN RIVIEWS Review final design. Attach comments on NPBU Doewnent Review Comment Sheet (PBF 1622) (g.g,yg Accertance Sienamre pet Comme,ts h C None O Anached t Q Nonc 0 ^t: acted None [ Attached None O Attached O None O^ttached None Q Artached L Nonc Q Attached O None O Attached 0 None Attached FDGH - RELEASE All design contr.Js have been properly implemented and the project has been appropriately reviewed. All necessary documents are approved Materials are on-site and QA-re! cased. This projeet is re! cased for installation. Comments regarding release of this project are noted belaw- // / f M FDGH: Date:

f. /

PROJECT MAN . CNS10UT N MRis complete, luding. submittal of all document updates in the Document Update and Closeout Checklist (PSF 1606). 3 List all Work Order (s) used for installation: .+ Project Manager: - Date: NUCLEARINFORMATION MANAGEMENT 1 Microfilm the entire modification package. I l f i i PSF teos i Revisen 2 11/01/96 Page 3 of 3 Acte eace(sX NP 7.2.1. NP 7.22 ,.a. -. ~ -. n, .,c

,, c_,_... MR 96-070 Final Design Description Purpose The purpose of this modification is to replace the existing 20-ampere, 30-ampere, and 40-ampere circuit breakers for six circuits in non-safety-related 120 VAC instrument panels 2Y-05 and 2Y-06. 'Ihe specific breakers which will be replaced are: Trip Rating Breaker (Amperes) CHAMPS Imad Descria*ian 2Y-05-01 20 PWR TO 2C-39/2POS-2026/2027 TURB STOP IND/ TEST 2Y.05-05 30 PWR TO 2C-03 TURBINE SUPERVISORY INSTRUMENT 2Y45-06 40 PWR TO 2 MOB-242/243/272-277/279 2Y-05-10 40 PWR TO 2 MOB-288-293/296/297/332 2Y-06-01 30 PWR TO 2 MOB-175/178-181/183/184/240 2Y-06-05 30 PWR TO U2 MOISTURE PRESEPARATOR SYSTEM Action item #1 of condition report CR 96-539 identifies that the existmg breakers do not i i provide adequate short-circuit protection for the #12 AWG and #14 AWG' main control board conductors in the circuits. This inadequate protection creates the potent.ial for a short-circuit fault in one of the circuits to cause damage not only to the circuit conductors themselves, but also to adjacent conductors in redundant safety-related circuits. Description The existing breakers for the six circuits affected by this modification were installed in 1994 under the PBNP molded case circuit breaker replacement program. Each breaker is a single-pole, Westinghouse type EHD. The replacemem breakers will be identical in manufacturer and type, but will have reduced trip ratings to provide better protection for downstream main control board (MCB) conductors. Trip ratings for the replacement breakers were selected based upon a number of factors, including expected circuit load current and size' of downstream conductors. These trip ratings are as follows: Page 1 of 6

l I 1 o i Fri*ia. Replacement Breaker Breaker i Trip Rating Trip Rating j Breaker (Amperes) (Amperes) 2Y-05-01 20 15 ) 2Y-0545 30 15 [ 2Y-05-06 40 20 l 2Y-05-10 40 15 1 2Y-06-01 30 15 2Y-06-05 30 15 This design description will consider the acceptability of the replacement breakers for this application. For each replacement breaker, the following specific chmeteristics will be . considered for acceptability: physical dunensions and mounting con 5guration, interrupting capability, ability to carry circuit load current, conductor protection, and selective coordination. Each of these characteristics will be considered individually below: 1. Phvcient Dimanciens and Mountina Confiruration The replacement breakers must be installable in the 2Y-05 and 2Y-06 panels without any significant modifications to the panels, since the replacements will be performed with the panels energized. As previously menrioned, the replacement breakers will be identical in manufacturer and style (type) to the existing breakers. All case dimensions, panel bus connections, and mounting hardware will therefore be identical to those for the existing breakers. Neither 2Y-05 nor 2Y-06 are classified as safety-related or seismic class 1. However,2Y-06 is considered QA-scope Wam it powers fire protection equipment. To ensure that the QA-scoping of the par'elis not compromised by this modification, til breakers and mounting hardware utilized (including those for 2Y-05) will be QA-scope. 2. Interruptine Canshilirv The replacement breakers must be capable of safely interrupting the maxunum fault currents which they could potentially experience. WE calculation 96-0262, "Short-Circuit Currents Available at 2Y-05 and 2Y-06 Instrument Panels and Main Control Boards," calculates the maximum short-circuit current available at the 2Y-05 and 2Y-06 panels as 10,481 amperes and 6,987 amperes, respectively. Per the 1995 WW=F =m/ Cutler-Hammer Quick Selector Catalog (Page CC-51), the rated interrupting capability of type EHD1015 and EHD1020 circuit breakers is 14,000 amperes at voltages up to 277 VAC. Since this rating exceeds the maximum fault current available at 2Y-05 and 2Y-06, the interrupting capability of the replacement breakers is adequate for the application. 3. Ability to Carry Circuit I nnd Current The replacement breakers must be capable of carrying the maximum possible loads on their associated circuits without tripping. WE calculation 964245, " Loading of Page 2 of 6

~~ ~~. ;;; :T::: ^ T ^T = ~ ~ ~ ~ '= = ^: ~ ~ ^ ~ ~ ~ = ~ ~ ~ ~ \\ d s t~ t ) Selected Circuits on 1/2Y-05 and 1/2Y-06 Instrument Panels,* determined the maximum continuous loading possible on these circuits. The values determined in the calculation are listed below with the trip ratings of the replacement breakers: 1 Maximum Replacement Circuit Load Breaker Current Trip Rating Breaker (Amperes) (Amperes) j 2Y-05-01 2.15. 15 l 2Y-05-05 1.27 15 1 2Y-05-06 17.00 20 2Y-05-10 6.76 15 1 j 2Y-06-01 10.36 15 3 2Y-06-05 4.34 15 1 i j In all cases, the trip ratmg of the replacement breaker evaade the calculated maximum load current for the associated circuit by a substandal margin. The replacement breakers are therefore capable of carrying the maxunum load currents on their associated circuits without tripping, j 4. Conductor Protection i The replacement breakers must provide adequate overload and short-circuit protection j ' for downstream field cable and main control board conductors. o Field Cables l CARDS was used to obtain the following information about the field cables downstream of the six breakers which will be replaced under this modification: Replacement Breaker Field Basic Cc:ductor Minimum Trip l Cable Cable Sire Ampacity Rating j' Breaker ID. Designation (AWG) (Amperes) - (Amperes) i 2Y-0541 2Y0501A B13 10 17.0 15 2Y 0545 2Y0505A B12 8 35.0 15 l 2Y-05-06 2YO506A - B12 8 35.0 20 l 2Y 05-10 2YO510A B12 8 35.0 15 4 2Y 06 01 2YO601A B12 8 35.0 15 2YO601B - B13 10 20.0 2Y 0605 2Y0605A G03H 12 15.0 15 I.. In each case, the field cable (s) ampacity calculated by CARDS equals or j exceeds the trip rating of their associated replacement breaker. The j rep!mnt breakers therefore provide adequate overload protection for the - i Page 3 of 6

..m m. ou .,.m o. m. ....... i.,_.... field cables. Figures 2 and 3 in Attachm:nt A plot the tripping characteristics for the two replacement breaker types against the thermal damage characteristics for #12 AWG conductors. These figures indicate that, for all fault currents below approximateJy 5,500 amperes, each breaker type will clear the fault prior to the conductor temperature rising above its rated short-circuit value of 250 degrees Celsius. WE calculation 96-0262 calculates the maximum potential short circuit current available at the main control boards as 2,811 amperes for the 2Y-05 circuits affected by this modification, and 2,469 amperes for the affected 2Y-06 circuits. The replacement breakers will therefore provide adequare protection for the #12 AWG (or larger) conductors in the downstream field cables for all possible main control board shott-circuit faults. Main Control Board Wiring Field walkdowns were performed to determine the minimum sizes of the main control board conductors downstream of the six breakers which will be replaced under this modification. The walkdowns determined that all circuits except 2Y-05-06 contain #14 AWG type SIS conductors in the main control boards. 2Y-05-06 was determined to contain both #12 and #14 AWG conductors. . However, further investigation revealed that the location of the #14 conductors in this circuit precludes any possible short-circuit damage,to these conductors from affec*ing rWaw, opposite-train safety equipment. Protection of the

  1. 14 AWG conductors in this circuit will therefore not be addressed.

Since CARDS does not calculate ampacities for internal wiring, the National - Electrical Code (NEC) must be used to determine the acceptability of overload protection for such wiring. Table 310-16 shows the rated ampacity for #14 and

  1. 12 AWG type SIS conductors to be 25 and 30 amperes, respectively. These values must be adjusted for ambient temperature and for number of conductors in the raceways through which the conductors are routed. Per Design Guideline DG-E09, the design ambient temperature for the control room is 24 degrees Celsius. The 1996 NEC permits an ampacity adjustment factor of 1.04 for this ambient temperature. - Since many non-safety-related main control board conductors are not contained in CARDS, it is not possible to obtain an accurate
  • The wires in cisemit2Y-05-06 which were verified by wakdown to be #14 AWO are the line side jumpers from 2MOS.277 to 2 MOB-279, ad kom 2MOS 279 to 2 MOB 242 and 2 MOB-243. A review of the As-Built MCB photos shows that these #14 AWG jumpers are routed adjacent only to other line-sidejumpers and wiring for MOBS 2MOS.278,241,244 through 248, and 334 through 336 (also the fuses below 2 MOB-336). Any damage occumng on the #14 jumpers becaut.e of a short-circuit fault would have the potential to damage any or all of these adjacent i

wires, which could, in turn. resuk in a trip of the associated upstream breakers (1Y-05-22,1Y-05-07, lY-06-01, and 1 MOB-001), and a loss ofpower to all associated MOBS and loads. However, a review of Wolfe & Mann drawings E 1267E-8, E 1231E-A, and E-1260E-A shows that all loads which would be lost in such a e ise are either Train A safety-related loads, or non-safety-related loads. Thus, a fault on the potentially inadequately potected jucoers from 2 MOB-277 to 2 MOB-279 and from 2 MOB-279 to 2 MOB-242 and 2 MOB 243 would not hee any pr centi 4 to result in simultaneous damage to opposite-train circuits, and would therefore have no potential to affect redundant safety functions. 4 Page 4 of 6 b

.......... ~ i estimate of the number of conductors routed through main control board raceways. Thus, the number (43 or more) resulting in the maximum ampacity )- derating factor of.50 will be assumed. Applying the ampacity correction factors for ambient temperature and for number of conductors, final rated ampacities of(25)(1.04)(0.50) = 13 amperes for #14 AWG and 4 (30)(1.04)(0.50) = 15.6 amperes for'#12 AWG are obtained. Since these i values do not correspond to standard breaker trip ratings, Article 240-3(b) of i the 1996 NEC permits use of the next-larger standard size to protect these conductors (i.e.15 amperes for #14, and 20 amperes for #12). These sizes I correspond directly to the trip ratings of the replacement breakers. The replacement breakers will therefore provide adequate short-circuit protection for j the main control board conductors in the six affected circuits. L As previously mentioned, five of the six circuits affected by this modification utlhze #14 AWG conductors in the main control board, while the sixth circuit (2Y-05-06) utilizes #12. Figure 1 in Attachment A plots the tripping characteristics for the rephe*==t breaker type to be used in all circuits except 2Y-05 06 (Westinghouse EHD1015) and the thermal damage characteristics for

  1. 14 AWG conductors. This figure indicates that, for all fault cumnts below approximately 3,500 amperes, the EHD1015 breaker will clear the fault prior to i

the #14 AWG conductor temperature rising above its rated short-circuit value of j 250 degrees Celsius. Figure 3 in Attachment A plots the tripping characteristics j for the replacement breaker type to be used in circuit 2Y-05-06 (Westinghouse EHD1020) and the thermal damage characteristics for #12 AWG conductors. This figure indicates that, for all fault currents below approximately 6,000 amperes, the EHD1020 breaker will clear the fault prior to the #12 AWG i conductor temperature rising above its rated shott-circuit value of 250 degrees i . Celsius. WE calculation 96 0262 calculates the maximum potential short-circur current available at the main control boards as 2,811 amperes for the 2Y-05 j circuits affected by this modification, and 2,469 ampercs for the affected 2Y-06 circuits. Thus, the replacement breakers will provide adequate short<ircuit protection for their associated main control board conductors over the entire l range of potential main control board fault currents. i 5. salmenv coordinaden . Design OnMeHn* DG-E04, " Selection of Molded-Case Circuit Breakers " establishes selective ccviLation requirements for molded-case circuit breakers. This Guideline requires that a breaker selectively coordinate with its associated upstream device (s) in 1 - the following cases: The breaker serves as an isolation device between non-safety-related and safety-e related circuits. I The breaker serves as a connection between safety-related source and safety-i related load. Coordination is necessary to demonstrate conformance to Appendix R. i Page 5 of 6 ~

Neither the 2Y-05/2Y-06 panels nor any of their associated loads are classified as safety-related or are required for Appendix R. Thus, the selective coordination requirements given in DG-E04 do not apply to any of the breakers in the panels, including those to be replaced by this modification. References and Design Inputs CARDS Database - CHAMPS Database Condition Report CR 96-539 Cutler-Hammer Catalog #25-000. " Quick Selector," July,1995 Design Guideline DG-E04, " Selection of Molded-Case Circuit Breakers," Revision 00 Design Guidah DG-E09, " Cable Ampacity Calculations," Revision 01 National Electrical Code,1996 Edition WE Calculation N-93-056, " Battery DOS DC System Calculation," Revision 01 WE Calculation 96-0245, " Loading of Selected Circuits on 1/2Y-05 and 1/2Y-06 Instnunent Panels," Revision 00 WE Calculation 96-0262. "Short-Circuit Currents Available at 2Y-05 and 2Y-06 Instrument Panels and Main Control Boards," Revision 00 Wolfe & Mann Drawing E-1231E-A, Revision 01 Wolfe & Mann Drawing d-1260E-A, Revision 01 Wolfe & Mann Drawing E-1267E-B, Revision 01 Page 6 of 6

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