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Forwards Response to Request for Info on GL 93-04 Re Demonstration Plant,Schedule & Technical Bulletin on Rod Control Cluster Assemblies & Order Surveillance.Hl&P Plans to Implement Recommended Current Order Timing Changes
	ML20059C228
Person / Time
Site:	South Texas
Issue date:	12/21/1993
From:	Walsh L; WESTINGHOUSE OPERATING PLANTS OWNERS GROUP
To:	Thadani A; Office of Nuclear Reactor Regulation
References
	GL-93-04, GL-93-4, OG-93-109, NUDOCS 9401050034
	Download: ML20059C228 (105)
	v • d • e

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SUBJECT:

Westinghouse Owners Group Response to Request for Information on Generic Letter 93-04 Demonstration Plant, Schedule, and Technical Bulletin

REFERENCES:

1) NRC Generic Letter 93-G4, " Rod Control System Failure and Withdrawal of Rod Control Cluster Assemblics,10 CFR SC 54(f)." issued June 21,1993. 2) NRC Letter from A.C. Thadani to L. Walsh, " Westinghouse Owners Group Program in response to Generic Letter 93 Demonstration Plant, Schedule, and Technical Bulletin," dsted November 22,1993.

Dear Mr. Thadani:

As part of the Westinghouse Owners Group (WOG) response to NRC Generic Letter 93-04 (Reference 1), the WOG identified options to enhance reliability. One of the two options presented involved changes to the current order timing in the Rod C'atrol System and a new current order surveillance. This letter provides additional information on implementation of this option as requested by Reference 2. Following the September 13 meeting with the NRC, the WOG has been working with its members to identify a lead plant to perfonn the current order timing changes and confirm that should a failure similar to the one experienced at Salem Unit 2 occur, no RCCA motion would result. ,. o n r, i 1 4 9401050034 931221 g PDR ALOCK 05000498 sag f'3 P PDR i g

F i 5 Houston Lighting and Power's South Texas Project Unit 1 is planning to implement the recommended current on!er timing changes with testing scheduled to commence in January,1994. The purpose of the testing is to both demonstrate that the new timing does not affect normal RCCA operation and that any RCCA motion is precluded under faulted conditions such as those experienced at Salem. Westinghouse is also completing the Technical Bulletin that will be provided to each taility with guidance on both the timing changes and the new surveillance. At this time, the Technical Bulletin has not been finalized pending completion of the testing at South Texas. However, in order to permit utilities as much lead time as possible for spring outages. Westinghouse will be providing a draft of the Technical Bulletin in 1993. The draft is attached (Attachment 1) and will be issued in final form in early February,1994 once the testing at South Texas is complete and the tirning changes are confirmed to be adequate. Reference 2 also requested information conceming the new current order surveillance. The WOG has been working with Westinghouse on the development of the new current order surveillance. presents a draft of tir new cunent order surveillance. is a revision to the Failure Assessment, previously published in WCAP-13864, " Rod Control System Evaluation Pmgram." The revision provides the failure assessment using the lift cL1 current order timing values that are being recommended in the Rod Control System Enhancement Technical Bulletin for all Westinghouse L106-type control rod drive mechanisms. Please ensure that those reviewing WCAP-13864 review only the revised assessment. Only failure modes 3.f.,3.w., and 3.x are affected by the change. Should you have any questions regarding this letter, please contact me at (603) 474-9521, ext 3347. Very truly yours, O Lawrence A. Walsh, Chairman Westinghouse Owners Group cc: Westinghouse Owners Group Primary Representatives (IL) WOG Steering Committee (IL) Systems & Equipment Engineering Subcommittee Representatives (IL) William T. Russell, NRC (IL) James G. Panlow NRC (IL) C.K. McCoy, Georgia Power (IL) J.P. O'Hanlon, Virginia Power (IL) N.J. Liparulo, W (IL) A.P. Drake, W (IL)

r Attachment I to OG-93-109 Draft Westinghouse Technical Bulletin NSD-TB-93-08-R0 Rod Control - CRDM Timing Changes 3 pisset' DRAH t i l i 1

l \\ DRAFT i ""*[TB. 93 08-RO ROD CONTROL-CRDM TIMING CHANGE S 3Y'***I*I Date SOLID STATE r.OD CONTROL SYSTEM 12/14/93

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ALL W NSSS PLANTS WITH SOLID STATE ROD CONTROL SYSTEM 340 References is Safety Related Yes @ Page 1 of 10 Equipment impacted No O REFERENCES 1. Generic CRDM Timing Program,.WEMD Engineering Letter SE-93-180, dated October 18,1993. 2. Rod Control System Evaluation Program, WCAP-13864 dated September 24,1993. 3. Rod Control-Single Rod Withdrawal, Westinghouse Technical Bulletin NSD-TB-93 03 RO dated August 10,1993. 4. Potential Problem With Westinghouse Rod Control System and inadvertent Withdrawal of a Single RCCA, NRC Information Notice 93-46 dated June 10,1993. 5. Rod Control System Failure and Withdrawal of Rod Control Cluster Assemblies, NRC Generic Letter 93-04 dated June 21,1993. Df;;.KGROUND On May 27,1993, control rods at a plant responded inconsistently to corrupted current orders such that one rod moved out when inward motion was requested. As a result of this event, the NRC issued Generic Letter 93-04, Reference 5. The Generic Letter requested each utility to determine whether the licensing basis for their facilities was still satisfied with regard to the requirements for system response to a single failure in the Rod Control System (GDC 25 or equivalent). At* tonal infamaton, N Required. may be Obtained from the originator. Teiophone 412-963-3719 orCMN) 241 3719 Onginatar A,voval J. Pysnik, PCD Spedal Products & Applications M. J. Harper Energy Systems Sales Support A. Sahasrabudhe, Mgr., Special Products & Appfications N.nner w=msrmuu o.cire corpannon no, e..mporn rw..ny..n.nry or repr. nwen wnn r p.a to In..cour.cx conce.n.a or u.mur= of th. trWormanon cortared in thss report or.a.um..ny r cxhutillary for latM#ry or carn.g. whkh rney r.eut from 15. u of mach Hormaten.

hh NSD-TB-93-08-R0 WESTINGHOUSE OWNERS GROUP ROD CONTROL SYSTEM ENHANCEMENT PROGRAM PLANT TIMING CHANGE ACCEPTANCE TEST OUTLINE ' ~ 1.0 PURPOSE AND GENERAL DISCUSSION NOTE: The following procedure is a test outline only. It is assumed that a plant-specific test, prepared in accordance with site-specific format and content requirements, will be written based upon this outline. In particular, plant-specific procedural requirements for approvals, recordng the calibrated equipment used, signatures / date requirements, etc. are to be added to this outline by plant personnel preparing the actual acceptance test that will be performed. 1.1 This procedure is performed as an acceptance test of a timing change to the Rod Control System. The test is part of the Westinghouse Owners Group Rod Control System Enhancement Program, MUHP-6002. The test is designed to support plants implementing the timing change to the Rod Control System Logic Cabinet decoder printed circuit cards, as part of the response to NRC Generic Letter 93-04. 1.2 This test has the following objectives: A. To verify that the Rod Control System Logic Cabinet timing changes have been properfy implemented. B. To verify that Rod Control System timing changes recommended to preclude movement of less than a group of control rods have no effect on normal rod motion. 1.3 This test consists of two subtests: A. The recordng of a set of stave cycler logic traces - With the revised current order timing installed, the outputs from each slave cycler decoder card will be recorded and analyzed to verify that the proper revised timing sequences are being produced. R. The recordng of a set of current traces for each control rod with the new curre,d order timing installed -- Both a withdrawal and an insertion sequence of 10 steps each will be recorded for each bank of rods. This data will be analyzed to ensure that the modification has no adverse effect on normal rod motion and to determine the range of CRDM responses to the revised current orders.

) j ] g pa NSD-TB-93-08 R0 l t 9.} (" l , kf $1 Page 2 of 10 A Westinghouse Owners Group (WOG) program was initiated to determine appropriate response to Generic Letter 93-04. The program concluded that the licensing basis continued to be met but identified two options that would enhance the basis for that determ; nation. One of,the options was to implement a new current order timing, which would preclude any uncontrolled single rod withdrawal event from occurring due to a single failure in the Rod Control System, and implementation of a new current order surveillance test. Many utilities, in responding to NRC Generic Letter 93-04, committed to implement the new tirning and additional surveillance test. This Technical Bulletin provides information to implement current order timing changes that satisfy the commitments made. Information regarding the additional surveillance test is being provided through a Westinghouse Owners Group transmittal which is not part of this Technical Bulletin. DESCRIPTION OF CHANGE This technical bulletin provides instructions for positioning of diodes on the Westinghouse Solid State Rod Control System Logic Cabinet Slave Cycle Decoder Cards 3359C62 Groups G01, G02, and G03, to implement a revised Westinghouse standard timing applicable to all models of rod drive mechanisms in the L-106 family. MATERIAL The implementation of this design requires no addtional parts. If dodos or printed circuit boards are inadvertently damaged while making the changes, the Utility should restore the functionality of the board in accordance with site printed circuit board repair / replacement procedures. METHOD Perform the modifications in moordance with attached instructions. Marked-up drawings are included as Attachment 1 that reflect the final printed circuit board configurations for changes given in this document. Customer QA Program procedures apply for implementation of the printed circuit card changes recommended by this document. Customer procedures apply for removing the SOLID STATE ROD CONTROL SYSTEM from service in order to make the changes described in this bulletin. It is required that these changes be made with the plant in a shutdown condtion.

~ 1 l ~ 3N NSD-TB-93-08.R0 OQr 1 , $c d Page 3 of 10 "" CAUTION"" The repositioning of diodes on the prirned circuit boards, as described later in this i document, requires handling of the printed circuit boards, removal of the printed circuit boards from the system, and repositioning of dodes that are currently fastened to the. -f printed circuit boards. Customer Quality Assurance and soldering workmanship. standards, safety procedures, and electrostatic control procedures are suggested so that cor";mnents on the printed circuit boards are given appropriate care to prevent damage dw to excessive heat during soldering or damage due to electrostatic discharge during handling.- Each modified PC card should be independently verified to be in accordance with the requirements of the reference drawings piior to being returned to the system for testing in ' accordance with the attached Acceptance Test Procedure. Testing the cards prior to retuming them to the system :s a recommended option but is not a requirement. REFERENCE WESTINGHOUSE DRAWINGS 1. 1051E78 Logic Cabinet Assembly - Solid State Rod Control (SSRC). 2. 1057E36 Logic Cabinet Assembly - Solid State Rod Control (SSRC). 3. 3359C62 Printed Wiring Assembly - Slave Cycler Decoder (lift = G01, stationary = G02, - moveable = G03) (Revised to Rev. M.). 4. 6052D01 Schematic Diagram - Slave Cycler Decoder (lift) (Revised to Rev. H.). 5. 6053D12 Schematic Diagram - Slave Cycler Decoder (stationary) (Revised to Rev. G.). 6. 6051D98 Schematic Diagram - Slave Cycler Decoder (moveable) (Revised to Rev. G.). 7. 6056D01 Logic Cabinet Logic Flow - Maximum System (Revised to Rev. U.). NOTE: Marked-up sheets of References 3 through 7 are included as Attachment 1 to - reflect the impact of the change to the slave cycler decoder cards. The Logic ) Cabinet Assembly drawing for a plant is either Reference 1 or Reference 2, not both. The Westinghouse master drawings will be revised per the mark-up to the revision levels indcated above. l i I

NSD-TB-93-08 R0 pp ,, d[ Page 4 of 10 6 REFERENCE FIGURES 1. Location of Major Assemblies. Full Length Solid State Rod Control System Logic Cabinet Technical Manual, Volume 2, Chapter 2. Section 1 (typically Figure 1-2). 7 2. Timing Diagram of Out (Up) Current Orders with Corresponding Current Profiles, Full Length Solid State Rod Control System Logic Cabinet Technical Manual, Volume 2, Chapter 2, Section 2 (typically Figure 2 6). 3. Timing Diagram of in (Down) Current Orders with Correspondng Current Profiles, Full' I Length Solid State Rod Control System Logic Cabinet Technical Manual, Volume 2 Chapter 2 Section 2 (typically Figure 2-7). 4. Relationship Between Slave Cycler Decoder Diode Rows and Functions, Full Length Solid State Rod Control Syst9m Logic Cabinet Technical Manual, Volume 2, Chapter 2. Section 3 (typically Table 3 5) 5. Binary Numbers 0-127, Full Length Solid State Roo wntrol System Logic Cabinet Technical Manual, Volume 2, Chapter 2, Section 3 (typically Table 3-6). 6. Changing Mechanism Timing Full Length Solid State Rod Control System Logic Cabinet Technical Manual, Volume 2, Chapter 2, Section 3 (typically Section 3.4). 7. CRDM Speed Timing, Westinghouse Instruction and Operating Book, Magnetic Cornrol Rod Drive Mechanism for Full-Length Control Rods (typically Section 4). 8. Normal insert Trace, Westinghouse Instruction and Operating Book, Magnetic Control Rod Drive Mechanism for Full-Length Control Rods (typically Section 4). i 9. Normal Withdaw Trace, Westinghouse Instruction and Operating Book, Magnetic Control Rod Drive Mechanism for Full-Length Control Rods (typically Section 4). l DIODE REPOSITIONING INSTRUCTIONS The following steps are guideines for repositioning dodes on the slave cycler decoder cards, 1. Remove all spare slave cycler cards from storage and afix temporary tags indcating the card is a spare. 2. Ascertain functionality of each spare prior to performing any diode repositioning work. ..] _y m. ..-,9 +

q :m e NSD-TB-93-08-R0 p$ y h Q k' '$ hj M i3 Page 5 of 10 NOTE: If additionalinformation is needsd to ascertain card functionality, contact Westinghouse. 3. Review plant soldering procedures and use approved heat sink techniques on the dodes d' iring soldering and approved board cleaning methods after the change is completed. 4. Review plant electrostatic gocedures and use approved electrostatic gear and work surfaces while handling the boards 5. It is recommended that the spare boards be modified first to become accustomed to the procedural steps. Group all spare decoder cards (printed wiring assembly 3359C62) as G01, G02, and G03. 6. Rearrange the diodes on the slave cycler decoder cards as follows: A. Lay a G01 printed circuit board between sheet 2 of drawing 3359C62 and Figure 3 of this document, a G02 board between sheet 3 of drawing 3359C62 and Figure 1 of this document, and a G03 board between sheet 4 of drawing 3359C62 and Figure 2 of this document. B. Compare the dode orientation on the printed circuit toard to the diode orientation on the corresponding assembly drawing and to the dode orientation on the correspondng figure when the diodes are visible and the card edge connectors point toward the examiner. C. Note dscrepancies between the fbures and the pc board by encircling the dode on the printed wiring assembly drawing that does not align with the corresponding dode on the figure. In Figures 1,2, and 3, the dode orientation is depicted as '% for *1' and

/" for *0* in each dode row F, C, D, A, E, B with F row away from the card edge connector.

D. Use piant-approved de-soldering and heat sinking methods to remove the solder from the dodes (card-edge-connector-end only) to be changed per the marked-up printed circuit board assembly drawing of Step 6.C. E. Carefully, lift the un-soldered end of the diode, slowly twist the loose end of the diode untilit aligns with the hole at the alternate position, and re land the dode in its alternate position. i F. Solder the dode to the printed circuit assembly in its alternate (new) position. l l

~ NSD-TB-93-08 R0 h$ YiS Page 6 of 10 G. Check all work by comparing the dodes on printed circuit assembly 3359C62 to those of Figure 1,2, and 3 in this document (G01 to Figure 3, G02 to Figure 1, and G03 to Figure 2). H. Mark each printed drcuit assembly in approximate vicinity of serial number to indcate that the board has been revised and that the diodes are positioned to agree with Westinghouse Assembly 3359C62 Revision M (Sheet 1 Revision M, Sheet 2 Revision M, Sheet 3 Revision L and Sheet 4 Revision L). I. New diode orientation is shown on copies of drawings provided as Attachment 1 and cited in the section above " REFERENCE WESTINGHOUSE DRAWINGS." 7. Functionality of the boards, after the diode positions on all spare 3359C62G01, G02, or G03 boards have been changed, can be tested in a separate test facility or in the system prior to be returned to spares. 8. Use the drawings and figures given in the Reference Sections of this document as an aid in locating the system's slave cycler decoder cards. All system slave cycler decoder cards locations (Logic Cabinet sloi numbers) are given atop Figures 1,2, and 3. Depending on the plant control rod bank and group configuration, all slots may not contain a card. 9. Tag each board with a temporary tag as it is removed from the system with its respective cabinet slot location.

10. Repeat steps 6.A. through 6.H for each slave cycler decoder card (3359062) found in the system.

11. Functionality of the boards, after the diode positions on all"J359062G01, G02, or G03' boards have be changed, can be tested in a separate test facility or in the system.

12. Remove the temporary tags as each modfied board is installed in its previous Logic Cabinet card slot.

13. Perform system testing in accordance with the acceptance test procedure (Attachment 3) prepared for the change described in this document.

Generic technical manualinsertt m attached that can be included in the appropriate volume of the Solid State Rod Control System Technical Manual set, and the Control Rod Drive Mechanism Instruction Book. These inserts, as well as marked-up drawings that reflect the final revised design dawings, are provided as Attachment 1 of this document.

-( I j NSD-TB-93-08 R0 i Page 7 of 10 Section 2.19 of the Control & Electrical Systems Standard (Rod Control System Standard) has. been revised.. If a separate transmittal of Section 2.19 is desired, contact Westinghouse. ATTACHMENTS 1. Generic inserts for the Solid State Rod Control System Technical Manuals.- '2. Phnt Timing Change Acceptance Test Outline. r h r qGI 4 4 i b i k I i f i i i h + f I -)

.1 p.G$IT Ij 3 NSD-TB-93-08 R0 i Page 8 of 10 FIGURE 1: REVISED DIODE ORIENTATION FOR ALL PLANTS WITH STATIONARY DECODER CARD 3359C62G02 LOGIC CABINET LOCATIONS A301, 401, 409, 501, 509, SPARES ROW BINARY Wr/ BINARY NO./ DIODE NO./DICOE POS. DECINAL NO. r 0 1 1 1 0 1 0 46 CR36 CR37 CR38 CR39 CR40 CR41 CR42 / g g g f g 7 (in full off) 1 2 4 8 16 32 64 C 0 0 0 0 0 1 0 32 CR29 CR30 CR31 CR32 CR33 CR34 CR35 / / / / / \\ / (out full off) D 1 1 1 1 1 0 1 95 CR22 CR23 CR24 CR25 CR26 CR27 CR28 g g g g g / g (in full on) 1 2 4 8 16 32 64 A 0 0 0 1 0 0 1 72 CR15 CR16 CR17 CRIS CR19 CR2O CR21 / / / g / / g (out full on) E BLANK B BLANK CARD EDGE CONNECTOR

g3 P lt r"*m f" NSD-TB-93 08-R0 i i l Page 9 of 10 Figure 2: REVISED DIODE ORIENTATION FOR ALL PLANTS WITH MOVABLE DECODER CARD 3359C62G03 LOGIC CABINET LOCATIONS A303, 403, 411, 503, 511, SPARES ROW BINARY Wr/ BINARY NO./ DIODE NO./ DIODE POS. DECIMAL NO. F 1 0 0 0 1 1 1 113 CR36 CR37 CR38 CR39 CR40 CR41 CR42 g / / / g g g (in full off) 1 2 4 8 16 32 64 C 0 0 1 1 1 0 1 92 CR29 CR30 CR31 CR32 CR33 CR34 CR35 e (out full off) f f D 1 1 1 1 1 0 0 31 CR22 CR23 CR24 CR25 CR26 CR27 CR28 g g g g f f (in full on) 1 2 4 8 16 32 64 A 1 1 0 1 0 0 0 11 CR15 CR16 CR17 CRIS CR19 CR20 CR21 g g / g / / / (out full on) i E 1 1 1 1 0 1 1 111 CR8 CR9 CR10 CR11 CR12 CR13 CR14 (in step ctr. on) B 1 1 1 1 0 1 1 111 .CR1 CR2 CR3 CR4 CR5 CR6 CR7 g g g g / g g (out step ctr. on) CARD EDGE CONNECTOR I i i

~ NSD-TB-93-08 R0 k Page 10 of 10 a-Figure 3: REVISED DIODE ORIENTATION FOR ALL PLANTS WITH LIFT DECODER CARD 3359C62G01 LOGIC CABINET LOCATIONS A302, 402, 410, 502, 510, or SPARES ROW BINARY WT/ BINARY NO./ DIODE NO./DICOE POS. DECIMAL NO. r 0 0 0 0 0 0 1 64 CR36 CR37 CR38 CR39 CR40 CR41 CR42 / / / / / / (in reduced off) 1 2 4 8 16 32 64 C 0 1 1 0 0 1 1 102 CR29 CR30 CR31 CR32 CR33 CR34 CR35 / g g / / (out reduced off) 1 2 4 8 16 32 64 D 1 0 0 0 0 0 0 1 CR22 CR23 CR24 CR25 CR26 CR27 CR28 / / [ / / [ (in full on) 1 2 4 8 16 32 64 l A 0 0 0 0 1 1 0 48 CR15 CR16 CR17 CRIS CR19 CR20 CR21 / / / / \\ / (out full on) E 1 1 0 0 0 1 0 35 CR8 CR9 CR10 CR11 CR12 CR13 CR14 (in full to reduced) f 7 7 B 1 0 1 1 0 0 1 77 CR1 CR2 CR3 CR4 CR5 CR6 CR7 (out full to reduced) g / g f 7 CARD EDcE CONNECTOR

4_ i I 1 NSD-TB-93-08 R0 ) m R (4,. 'A a o ~ l 1 i i l ATTACHMENT 1 -l J l j 1 l ~l e

J I 49 NSD-TB-93-08 R0 U$$]l~h ? e ROD CONTROL MANUAL INSERTS

NSD-TB-93 08 R0 ["% y p ~ 3 [ INSTRUCTIONS ~ FOR CRDM CURRENT PROFILE ENHANCEMENT TECHNICAL MANUhL INSERT The current profiles for all plants with the L-106 CRDM family (L-106, L-106A, L-106A1, L-106B, and L-106RL) have been standardized. This resulted from the Westinghouse Owners Group (WOG) investigation in response to NRC Generic Letter 93-04. The new standard is as given in Westinghouse Technical Bulletin NSD-TB-93-08-RD. The insert provided reflects the Rod Control System Technical Manual material that has been updated to reflect the CRDM timing change and the resultant current orders that produce the recommended current profiles. BACKGROUND On May 27, 1993, control rods at a plant responded inconsistently to corrupted current orders such that one rod moved out when inward motion was requested. As a result of this event, the NRC issued Generic Letter 93-04,. Reference 5. The Generic Letter requested each utility to determine whether the licensing basis for their facilities was still satisfied with regard to the requirements for system response to a single failure in the Rod Control System (GDC 25 or equivalent). A Westinghouse Owners Group (WOG) program was initiated.to determine appropriate response to Generic Letter 93-04. The program concluded that the licensing basis continued to be met but identified two options that would enhance the basis for that determination. One of the options was to implement a new current order timing, which would preclude any uncontrolled single rod withdrawal event from occurring due to a single failure in the Rod Control Systes, and implementation of a new current order surveillance test. Many utilities, in responding to NRC Generic Letter 93-04, committed to implement the new timing and additional surveillance test. This package provides documentation that can be added to the-Rod Control Technical manuals to reflect the current order timing changes that satisfy the i i commitments made. The description, revised figures, and marked-up portion of this insert package should be kept within appropriate volumes of the Rod Control System Technical Manual set. The final owner of the Technical Manual should add the contents of this insert package to best serve their needs and update j (handwritten entries are acceptable) the " List of Effective j i

4 i NSD-TB-93-08 R0 , _,g 1E

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h f Paves" portion at the front of the manuals acecrdingly.. As \\ r u cgestion, the contents of the insert package may be. y4 Lad in the technical manual as follows:

This " Description and Background" portion of the insert package be placed near the "runctional Description of the Slave Cyclers" which is generally section 1.2.2 of Volume 2, Chapter 2 (Logic Cabinet).

i

The figure "L-106 Family Rod Control Drive Mechanism, Timing Diagram" should replace the figure "L-106-- Rod Control Drive Mechanism, Timing Diagram" which is i

generally Figure 1-6 of Section 1, volume 3, Chapter 3 (Power Cabinet).

The figures " Timing Diagram of out'(Up) Current orders with corresponding' Current Profiles" and " Timing Diagram of In (Down) Current Orders.with Corresponding Current Profiles" should replace the same captioned figures currently in Section 2 of volume 2, Chapter 2 (Logic Cabinet) which are generally Fby to 2-6 and 2-7.

Figures 1, 2, and 3 of the insert package could be added after the Binary Numbers Table (typically Table

6) of Section 3.4 (Changing Mechanism Timing) of' Volume 2, Chapter 2 - Logic cabinet Technical Manual.

Copies of Westinghouse drawings have been updated to reflect the changes. The copies'and can be placed in Section 4 of the manual.

Updated sheets of drawing 3359C62 that are included'in the insert package can be substituted for the same numbered sheets in Section 4 of the manual once the diode changes have been implemented.
Updated drawing 6052001 that is included in the insert package can be substituted for the same drawing in Section 4 of the manual once the diode changes have been implemented.
Updated drawing 6053D12 that is included in the insert package can be substituted for the same drawing in Section 4 of the manual once the diode changes have been implemented.
Updated drawing 6051D98 that is included in the insert package can be substituted for the same drawing in 3

Section 4 of the manual once the diode changes have been implemented.

Updated sheets of drawing 6056D01 that are included in the insert package can be substituted for the same numbered sheets of the same drawing in Section 4 of

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NSD-TB-93-08 RO n!o g 7'" $.N Figure 1: REVISED D1005 ORIENTATION FOR ALL FLANTS WITH STATIONARY DICODER CARD 3359C62G02 LOGIC CA31N37 LOCATIOMS A301, 401, 409, 501, 509, SPARES ROW SINARY WT/ BINARY WO./DIOCE NO./DIODS 705. DECIMAL NO. F 0 1 1 1 0 1 0 46 CR36 CR37 CR38 CR39 CR40 CR41 CR42 / \\ \\ \\ / \\ / (in full off) 1 2 4 8 26 32 64 C 0 0 0 0 0 1 0 32 t CR29 CR30 CR31 CR32 CR33 CR34 CR35 / / / / / \\ / (out full off) D 1 1 1 1 1 0 1 95 CR22 CR23 CR24 CR2S CR26 CR27 CR28 \\ \\ \\ \\ \\ / \\ (in full on) 1 2 4 8 16 32 64 A 0 0 0 1 0 0 1 72 CRi$ CR16 CR17 CR18 CR19 CR20 CR21 / / / \\ / / \\ tout full on) I sLAux 5 ELAKE e i

$ { 5 1 l J 1 - M e ac= NSD-TB-93-06 R0 wF 5 PA n gm 9 . &, d ' ;. Si 0, "4 s ,1 j - j w, 'i f Figure 2: REVISED DICOE ORIENTATION FOR ALL PLANTS WITH NOVABLE DECODER CARD 3359C62003 Loc!C CABINET LOCATIONS A303, 403, 411, 503, 511, sPARas stow BINARY WT/ BINARY No./DIOCS NO./ DIODE Pos. DECINAL No, i F 1 0 0 0 1 1 1 113 l CR36 CR37 CR38 CR39 CR40 CR41 CR42 \\ / / / \\ \\ \\ tin full off) 1 2 4 8 16 32 64 l C 0 0 1 1 1 0 1 s2 CR29 CR30 CR31 CR32 CR33 CR34 CR35 't / / \\ \\ \\ / \\ (out full off) -l'l D 1 1 1 1 1 0 0 31 l i CR22 CR23 CR24 CR25 CR26 CR27 CR28 \\ .\\ \\ \\ \\ / / (in full on) t .) 1 2 4 8 16 32 64 r 3 i A 1 1 0 1 'O O O 11 i CR15 CA16 CR17 CR18 CR19 CR20 CR21 1 \\- \\ / \\ / / / (out full on) I 8 1 1 1 1 0 1 1 111. CR8 CR9 CR10 CR11 CR12 CR13 CR14 \\ \\ \\ \\ / \\ \\ (in step ctr. on) l 5 1 1 1 1 0 1 1 111 i l CR1 CR2 CR3 CR4 CRS CR6 CR7 I \\ \\ \\ \\ / \\ \\ (out step etr. on) I r i CARD 20C5 CONNECTOR i ) I f 'f i

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i NSD-TB-93-08 R0 r i th % e pm INSERTS FOR WESTINGHOUSE INSTRUCTION AND OPERATING BOOK MAGNETIC CONTROL ROD DRIVE MECHANISM FOR FULL-LENGTH CONTROL RODS i \\ b I e t i

1 NSD-TB-93-08 R0 k 'C ON: IN$tRT STEP ^ ll g le l' 1 1 LIFT w (RLs - / MG Aritf5 i ~ i [ y $$ W ERE$ = n L L e-1 .e e g a e E ar,ea g"*s g g d = g nmi .5 g wg wg w e t '95 13 t-e a un ** s as un I l' l I I i I i n a t e 1 E i D CLit CODE i 'ge 4 .i i MODEL L.106Al CAM. nao :sstu. FIGURE 4-3 Normalinsert Trace S

NSD-TB-93-08 R0 Rg ',[ =I f l I fC ONE WIDOIAf 5ftP = ~ IE II 88 le t \\ L!ri AMP (RES MII 4tPCRES I 't d [ [ .\\. " *W3 j i k 50Wlo .e g g3 g m 3 d 25lIsa 3 E rytm ~5 E W -9is E5 s e e su a as vu a 1 1 I I I I I l I l I l 1 I I CYCLIR CODE } :: y it pa rt {g I. I i f I M00(L L.106Al CADM R30 WITH0AM FIGURE 4-2 Normal Withdraw Trace O

[: ' e ~ NSD-TB-93-08 R0 DRIFT ^ ATTACHMENT 2 PLANT TIMING CHANGE ACCEPTANCE TEST OUTUNE oer e 4

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2.0 REFERENCES

2.1 Full Length Rod Control System Instruction Manual 3.0 PRECAUTIONS AND LIMITATIONS 3.1 This is a special test and should be controlled as such under the plant's Techn' cal Specifications and administrative' controls. 3.2 Only one bank of rods should be withdrawn at a time. Rods should be controlled by the reactor operator using the IN-HOLDOUT switch with the BANK SELECTOR switch in the "indvidual bank" mode. 3.3 The reactor should remain suberitical throughout this test; if indcations of criticality are observed,immedately trip the reactor. 3.4 Nuclear instmmentation System source range channels shall be monitored at all times when rods are being moved by the reactor operator. 3.5 The latch assembly of the CRDM must be submerged in water for proper operation. This is accomplished by maintaining a minimum Reactor Coolant System pressure of at least 50 psig. 3.6 The rod position indicators and digital step counters shall be monitored for rod motion. 4.0 PERSONNEL AND SPECIAL EOUIPMENT REQUIREMENTS 4.1 One reactor operator 4.2 Two I&C technicians 4.3 One I&C engineer 4.4 Two calibrated 8 channel recorders capable of recording slave cycler outputs at the Logic Cabinet and CRDM current profiles at the Power Cabinets 5.0 PREREQUISITES AND INITIAL CONDITIONS 5.1 The Logic Cabinet lift, movable and stationary decorder printed circuit boards have been modfied to the new timing values in accordance with Westinghouse Technical Bulletin XX. = .m

h NSD-TB-93-08 R0 un u;nr; 5.2 Suberiticality is being maintained using boron in accordance with p! ant shutdown conditions and special test requirements. [NEEDS PLANT SPECIFIC WORDING.] 5.3 Communications have been establishad between the reactor operator and the personnel performing the test at the Rod Control System cabinets. 5.4 The Rod Control System is operable, with rod drive motor generator sets in operation and auxiliary 120-vac power available to the Rod Control System, 5.5 The main and shutdown pulsers and oscillators have been calibrated, in accordance with the Rod Contro! System Instruction Manual or plant procedure. Record the control bank and shutdown bank speeds-Control bank speed spm Shutdown bank speed spm 5.6 The Reactor Protection System is operable in accordance with Technical Specifications and capable of both closing and tripping the reacbr trip breakers. 5.7 At least one CRDM coofng fan is in operation. [ PLANT SPECIFIC VALUE] 5.8 The Reactor Coolant System pressure is being maintained above at least 50 psig. [ PLANT SPECIFIC VALUE] 5.9 The reactor trip breakers are initially open. 6.0 PROCEDURE 6.1 Test 6.1.1 Logic Cabinet slave cycler timing tests for each slave cycler: A. Connect the recorders to the test points that monitor slave cycler stationary, rnovable, and Ett decoder outputs for the 1 AC and 2AC slave cyclers and to the PULSCX signal. Recorder No.1: 1) 1 AC stationary decoder SA signal. A401 TP1 2) 1 AC stationary decoder S8 signal, A401 TP2

e f'4,p. NSD-TB-93-08 R0 E3fij't)f* 3) 1 AC Ett decoder LA signal, A402 TP1 4) 1 AC lift decoder LB signal, A402 TP2 5) 1 AC rnovable decoder MA signal, A403 TP1 6) 1 AC movable decoder MB signal, A403 TP2 7) PULSCXsi; 4 A108 TPS Grounded to logic,, und (clip to card frame) Recorder No. 2: 1) 2AC stationary decoder SA signal, A501 TP1 2) 2AC stationary decoder SB signal, A501 TP2 3) 2AC lift decoder LA signal, A502 TP1 4) 2AC lift decoder LB signal. A502 TP2 5) 2AC movable decoder MA signal, A503 TP1 6) 2AC movable decoder MB signal, A503 TP2 7) PULSCX signal, A108, TPS Grounded to logic ground (clip to card frame) Recorder adjustments: 1) Paper speed approximately 8-10 inches per second 2) Amplitude approximately 1 inch for 15 vde B. Depress the STARTUP RESET switch, then verify that no Logic Cabinet urgent alarms are present. (The Power Cabinet urgent alarms should still be present due to the open reactor trip breakers.) C. Select Control Bank A on the BANK SELECTOR switch. D. Place the IN-HOLD-OUT switch in the OUT position and then start the recorders. (The rods and step counters should not rnove due to the reactor trip breakers being open and the rasuttant Power Cabinet urgent alarms.) E. Ensure that at least 2 slave cycler sequences have been recorded and then release the IN-HOLD-OUT switch. F. Place the IN HOLD-OUT switch in IN position, G. Ensure that at least 2 slave cycler sequences have been recorded and then release the IN-HOLD-OUT switch. e m

NSD-TB-93-08-R0 H. Shift the recorders to the test points that monitor slave cycler stationary, movable, and lift decoder outputs for the 1BD and 280 slave cyclers and to the PULSCX signal. Recorder No.1: 1) 1BD stationary decoder SA signal, A409 TP1 2) 180 stationary decoder SB signal, A409 TP2 3) 18D lift decoder LA signal, A410 TP1 4) 1BD lift decoder LB signal, A410 TP2 5) 1BD movable decoder MA signal, A411 TP1 if)p'[ [* 6) 1BD movable decoder MB signal,- A411 TP2 y ;f 7) PULSCX signal, A108 TPS Grounded to logic ground (clip to card frame) +4 Recorder No. 2: 1) 2BD stationary decoder SA signal, A509 TP1 2) 2BD stationary decoder SB signal, A509 TP2 3) 2BD Ett decoder LA signal, A510 TP1 4) 2BD Eft decoder LB signal. A510 TP2 5) 2BD movable decoder MA signal, A511 TP1 6) 2BD movable decoder MB signal, A511 TP2 7) PULSCX signal, A108. TP5 Grounded to logic ground (clip to card frame) Recorder adjustments: 1) Paper speed approximately 8-10 inches per second 2) AmpEtude approximately 1 inch for 15 vde 1. Select Control Bank A on the BANK SELECTOR switch. ~ J. Verify that no Logic Cabinet urgent alarms are present or, if necessary, depress the ALARM RESET switch. (The Power Cabinet urgent alarms should still be present due to the open reector trip breakers.) K. Place the IN-HOLD-OUT switch in the OUT position and then start the recorders. (The rods and step counters should not move due to the reactor trip breakers being open and the resultant Power Cabinet urgent alarms.)

1-pN]: Q i?" 3 ((4 h' C NSD-TB-93-08 R0 ks L Ensure that at least 2 slave cycler sequences have been recorded and then release the IN-HOLD-OUT switch. M. Place the IN-HOLD-OUT switch in IN position.- N. Ensure that at least 2 slave cycler sequences have been recorded and then release the IN-HOLD-OUT switch. O. Connect one recorder to the test points that monitor slave cycler stationary, rnovable, and lift decoder outputs for the SCD slave cycler and to the PULSCX ucnal. Recorder No.1: 1) SCD stationary decoder SA signal, A301 TP1 2) SCD stationary decoder SB signal, A301 TP2 3) SCD lift decoder LA signal, A302 TP1 4) SCD lift decoder LB signal, A302 TP2 5) SCD movable decoder MA signal, A303 TP1 6) SCD movable decoder MB signal, A303 TP2 7) PULSCX signal, A108, TP5 - Grounded to logic ground (clip to card frame) Recorder adjustments: 1) Paper speed approximately 8-10 inches per second 1 2) Amplitude approximately 1 inch for 15 vde P. Select Shutdown Bank C on the BANK SELECTOR switch. l O. Verify that no Logic Cabinet urgent alarms are present or,if necessary, depress the ALARM RESET switch.. (The Power Cabinet urgent alarms should still be present due to the open reactor trip breakers.) a R. Place the IN-HOLD-OUT switch in the OUT position and then start the recorder. (The rods and step counter should not move due to the reactor trip breakers being open and the resultant Power Cabinet urgent alarms.) S. Ensure that at least 2 slave cycler sequences have been recorded and then release the IN HOLD-OUT switch. ..1 L--.-------- .l--.-

I ~ NSD-TB-93-08 R0

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l h; s .U < W ~i',1 en T. Place the IN-HOLD-OUT switch in IN position. U. Ensure that at least 2 slave cycler sequences have been recorded and then release the IN HOLD-OUT switch. V. Disconnect the recorder from the Logic Cabinet test points. 6.1.2 Baseline current traces for each rod, using the revised current order timing: A. Verify permission and then close the reactor trip breakers. B. Depress the S'ARTUP RESET switch, then verify all Rod Control System urgent alarms are reset.C. Connect the recorders to the test points that monitor stationary, movable, and lift current for Group A (Control Bank A) rod 1 in Power Cabinets 1 AC and 2AC. Recorder No.1: 1) 1 AC Group A rod 1 stationary current TP50 2) 1 AC Group A rod 1 lift current, TP62 3) 1 AC Group A rod 1 movable current, TP66 Grounded to neutral bus. TP74 Recorder No. 2: 1) 2AC Group A rod 1 stationary current, TP50 2) 2AC Group A rod 1 lift current TP62 3) 2AC Group A rod 1 movable current, TP66 Grounded to neutral bus, TP74 Recorder adjustments: 1) Paper speed approximately 10 inches per second 2) Amplitude approximately 1 inch for 0.5 vde D. Select Control Bank A on the BANK SELECTOR switch. E. Begin withdrawing Control Bank A rods using the IN-HOLD-OUT switch and then - start the recorders. Verify that the selected rods indicate proper motion by the group step counters and by individual rod position indcations. 9 P

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-q.... yn, 5r>gbII~$l NSD TB-93-08 R0 F. Stop rod mosement and the recorders at 20 steps withdrawn. Ensure that at least 5 steps of motion have been recorded. G. Begin inserting Control Bank A rods and then start the recorders. Verify that the selected rods indicate proper motion by the group step counters and by individual rod position indications. H. Stop rod movement and the recorders at 0 steps. Ensure that at least 5 steps of motion have been ra:orded. l. Connect the recorders to the second rod in the selected group in both Power Cabinets. J. Repeat steps E. through H. for the second rod in the selected group. K. Repeat steps I. a;,d J. until all rods in Control Bank A have been recorded. L Repeat steps C. through K. for the Control Bank C rods (test points for " Group B" in the 1 AC and 2AC Power Cabnets). M. Repeat steps C. through K. for the Shutdown Bank A rods (test points for " Group C"in the 1 AC and 2AC Power Cabinets). N. Repeat steps C. through M. for Control Banks B and D and Shutdown Bank 8 in the 1BD and 2BD Power Cabinets. O. Repeat steps C. through M. for Shutdown Banks C, D, and E in the SCD Power Cabinet. P. Disconnect the recorders from the Power Cabinets. 6.2 Retum to Service 6.2.1 Open the reactor trip breakers. j 6.2.2 Remove any test equipment installed in the Rod Control System. )

NSD-TB-93-08-R0 DMrmFT 6.3 Evaluation of Current Traces 6.3.1 Verify that all of the traces recorded in Section 6.1.1 of this test are similar to the example traces provided as Fi ures 1 and 2, for withdawal and insert cycles. C respectvefy and that, by using the PULSCX signal as a, counter, that the logic transitions occur at the proper slave cycle counts. 6.3.2 Verify that all of the traces recorded in Section 6.1.2 of this test are similar to the example traces provided as Figures ? vid 4, for withdrawal and insert cycles, respectively. Of importance are relative current magnitude, relative position of latch and unlatch indications, and accompanying rod movement. 6.3.3 For the traces recorded in Section 6.1.2, determine the number of milliseconds after the start of rod motion that the lift, rnovable, and stationary current orders change. The times should be within 10 milliseconds of the values provided on Figures 3 and 4. 7.0 ATrACHMENTS 7.1 Table 1 - Power Cabinet Mechanism Configuration. 7.2 Figure 1 - Withdrawal Cycle Slave Cycler Profile 7.3 Figure 2 - Insert Cycle Slave Cycler Profile 7.4 Figure 3 - Withdawal Cycle Current Profile 7.5 Figure 4 - Insert Cycle Current Profile i i j e e

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_ to OG-93-109 Draft Westinghouse Owners Group Rod Control System Enhancement Program Surveillance Test Outline i 1 DRAFT i 4 i r e

Westinghouse Owners Group [1 f.1 - 19F' Rod Control System Enhancement Program

40

~ bM[ Surveillance Test Outline - Draft 1.0 Introduction Pursuant to the requirements of 10 CFR 50.54 (f), the NRC issued Generic Letter 93-04, " Rod Control System Failure and Withdrawal of Rod Control Cluster Assemblies," on, June 21, 1993 addressed to all licensees with the Westinghouse Solid State Rod Control System for action, and to all other licensees for information. The Generic Letter required that each addressee provide an assessment of whether or not the licensing basis for each facility was satisfied with regard to the requirements for system response to a single failure in the Rod Control System (GDC 25 or equivalent). To support the industry response to NRC Generic Letter 93-04, the Westinghouse Owners Group (WOG) undertook several initf e,cives: conducted Rod Centrol System testing at the Salen training center, perforned an equipment survey of Westinghouse plants to determine the frequency and significance of control system circuit card failures, analyzed the worst-case asymmetric RCCA withdrawal combinations with three dimensional analytical methods, and performed a Failure Modes and Effects Assessment for failures in the Rod Control System that could lead to corrupted current orders being sent to rod drive mechanisms. After an extensive investigation, the WOG concluded that GDC 25 (or equivalent) continues to be met, but also recognized that there are questions as to the interpretation of the GDC and the appropriate definition of the specified acceptable fuel design limit. To address these questions, and make compliance with the GDC more clear, two measures were identified that utilities could take: modifications to include a combination of Rod Control System Logic Cabinet timing changes and an additional plant surveillance, or an FSAR safety analysis analyzing asymmetric rod withdrawal and an additional plant surveillance. The same additional plant surveillance is required by each of the options. The additional plant surveillance is required because the current surveillance only verifies rod motion (insertion and withdrawal) on a periodic basis. Single failures, which by themselves do not affect rod movement, are not detectable by this test. As the failure assessment only assumes single failures,-and assessment of multiple failures is impractical, it is essential to preclude undetected single failures that would otherwise 1

Westinghouse Owners Group +3 Rod Control System Enhancement Program

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Surveillance Test Outline - Draft 9& a' l

Ud have to be considered in conjunction with other failures.

This outline Surveillance Test is the suggested test to meet the commitment for an additional Surveillance Test that many utilities made in response to Generic Letter 93-04. It is assumed that the surveillance will'be controlled by procedure as a licensing commitment that does not require a license amendment adding it to the Technical Specifications. 2.0 Purpose and General Discussion Note: The following procedure is a test outline with additional information useful for preparing or reviewing a site specific test. It is assumed that the plant-specific procedure will be written based upon this outline, and that procedural requirements for prerequisites, initial conditions, approvals, sign-off and data recording will be added by plant personnel in accordance with plant specific requirements. The purpose of this test is to verify, once per cycle, that the correct magnetic jack current orders are being generated by the Westinghouse Solid State Rod Control System. The test verifies both current order timing and current regulation by measuring the current order waveforms to the lift coil, and movable and stationary latch coils, for one rod in each group of rods for control and shutdown rod banks. This Surveillance Test can be run as a separate test, but it is suggested that it be run in conjunction with the Rod Drop Tests. It is assumed to be run at hot plant conditions as this gives the most representative indication of the adequacy of the current regulation in normal plant operation. Note: Measuring the current profile to one rod in each group, such that within each power cabinet, three rods will be measured, is sufficient to verify the current timing and regulation. This satisfies the requirement to detect single failures in the Rod Control System that corrupt the current orders without affecting rod movement. For the rod on which the measurements are made, useful data is obtained to confirm the integrity of'the field 2 1

4 P [r3 f[< ) w,7 ' }[J{[]8g y Westinghouse Owners Group Rod Control System Enhancement Program Surveillance Test Outline - Draft e -l 1 cables and connectors, and the operation of the magnetic jack mechanism. While measuring current orders for each rod is not needed to meet the requirement of detecting single failures, consideration should be given to monitoring all rods during the test as a means of verifying the integrity of all connections and coils. If performed together with-rod drop testing, properly coordinated, and with two six channel recorders available, there should be no increase in overall time due to conducting the current order surveillance on'all rods in a group compared to a single rod in each group. This test io assumed to be a licensing commitment in response to Jeneric Letter 93-04, but is not included in the plant Technical Specifications.. 3.0 References 3.1 Full Length nod Control System Manual 4.0 Precautions and Limitations 4.1 [All) Precautions and Limitations that apply to rod drop testing apply to this test. 4.2 As this test requires connecting test equipment in the Rod Control System Power Cabinets, which contain potentially lethal voltages, extreme caru is required when connecting and disconnecting test probes. 4.3 As the Rod Control System ground and neutral connections are not directly connected, it is important that the recorder reference leads are connected to the neutral bus at Test Point TP74 and Dnt to the card frame or any other ground. 5.0 Prerecuisites and Initial Conditions 5.1 The plant and Rod Control System prerequisites and initial conditions that apply to rod drop testing apply to this test also. 5.2 Two calibrated recorders with three channels each or one 3 t

Westinghouse owners Group Rod _ Control System Enhancement Program Surveillance Test Outline - Draft calibrated recorder with six channels are required. (Two recorders are recommended as this will greatly reduce the length of the test leads. If all rods in each rod group'are to be monitored, then two six channel recorders would enable two rods in each group of a bank to be monitored at one time, such that all rods in the bank can be monitored in two passes. With four six channel recorders, ~all rods in banks with up to 8 rods can be recorded at the same time.) 5.3 Continuous communications should be established between the control room and the personnel performing the test at the Rod Control System Cabinets. The continuous communications are necessary to enable recordings of both insertion and withdrawal cycles in an expedient manner. Da,.4.h' / J i 4

Westinghouse Owners Group g j "p. Rod Control System Enhancement Program a c jf i m Surveillance Test Outline - Draft 6.0 Procedure Note: The following procedure steps are written based on the assumption that the test is being performed during hot rod drop testing, with only rod 1 in each group being recorded. It is further assumed that one complete bank will be withdrawn at a time for rod drop testing, and that the_ order of testing is Control Bank A, Control Bank B, Control Bank C, Control Bank D, Shutdown Bank A, Shutdown Bank B, Shutdown Bank C and Shutdown Bank D. Actual plant test _ requirements must conform with the plant configuration and should follow the rod drop test sequence. 6.1 Connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Control Bank A.. (Rod 1 in Group A of in Power Cabinets 1AC and 2AC.) All test points are on panel A70 in the respective power cabinet. Channel 1 - 1AC, TP50 - Group A rod 1 stationary current Channel 2 - 1AC, TP62 - Group A rod 1 lift current Channel 3 - 1AC, TP66 - Group A rod 1 movable current Channel 4 - 2AC, TP50 - Group A rod 1 stationary current Channel 5 - 2AC, TP62 - Group A rod i lift current Channal 6 - 2 AC, TPG6 - Group A rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.2 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.3 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 5

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Rod Control System Enhancement Program M (g '"s ) 8 Surveillance Test Outline - Draft 5 g 6.4 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 6.5 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.6 While the rod drop testing is being performed, make an l initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.7 While the Control Bank A rod drop testing is in progress, connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Control Bank B. (Rod 1 in Group A of in Power Cabinets 1BD and 2BD.) All test points are on panel A70 in the respective power cabinet. Channel 1 - 1BD, TP50 - Group A rod 1 stationary current Channel 2 - 1BD, TP62 - Group A rod 1 lift current Channel 3 - 1BD, TP66 - Group A rod 1 movable current Channel 4 - 2BD, TP50 - Group A rod 1 stationary current Channel 5 - 2BD, TP62 - Group A rod i lift current Channel 6 - 2BD, TP66 - Group A rod 1 movable current. There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.8 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.9 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five eteps of withdrawal current orders. 6

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Rod Control dystem Enhancement Program Surveillance Test Outline - Draft a 6.10 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 6.11 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.12 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.13 While the Control Bank B rod drop testing is in progress, connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Control Bank C. (Rod 1 in Group B in Power Cabinets 1AC and 2AC.) All test points are on panel A70 in-the respective power cabinet. Channel 1 - 1AC, TP54 - Group B rod 1 ste onary current Channel 2 - 1AC, TP62 - Group B rod 1 lift current Channel 3 - 1AC, TP66 - Group B rod 1 movrable current Channel 4 - 2AC, TP54 - Group B rod 1 stationary current Channel 5 - 2AC, TP62 - Group B rod 1 lift carrent Channel 6 - 2AC, TP66 - Group B rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.14 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.15 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 6.16 With the rods at 100 steps, request rod insertion to 80 7

I l Westinghouse Owners Group (* c, Rod Control System Enhancement Program if y Surveillance Test Outline - Draft $ jj: d ? steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 6.17 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.18 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.19 While the Control Bank C rod drop testing is in progress, connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Control Bank D. (Rod 1 in Group B in Power Cabinets 1BD and 2BD.) All test points are on panel A70 in the respective power cabinet. Channel 1 - IBD, TP54 - Group B rod 1 stationary current Channel 2 - 1BD, TP62 - Group B rod 1 lift current channel 3 - 1BD, TP66 - Group B rod 1 movable current Channel 4 - 2BD, TP54 - Group B rod 1 stationary _ current Channel 5 - 2BD, TP62 - Group B rod 1 lift current Channel 6 - 2BD, TP66 - Group B rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.20 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.21 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 3 6.2.' With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the 8 i l

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Rod Control System Enhtncement Program J0 d/g;s ~ Surveillance Test out.line - Draf t e., kd f.J k,1, % ' 1 .p-recorder (s) and record approximately five steps of insertion current orders, j 6.23 Verify that the withdrawal and insertion recording.s have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.24 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.25 While the Control Bank D rod drop testing is in progress, connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Shutdown Bank A. (Rod 1 in Group C in Power Cabinets 1AC and 2AC.) All test points are on panel A70 in the respective power cabinet. Channel 1 - 1AC, TP58 - Group C rod 1 stationary current Channel 2 - 1AC, TP62 - Group C rod 1 lift current Channel 3 - 1AC, TP66 - Group C rod 1 movable current Channel 4 - 2AC, TP58 - Group C rod 1 stationary current Channel 5 - 2AC, TP62 - Group C rod 1 lift current Channel 6 - 2AC, TP66 - Group C rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.26 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.27 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 6.28 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record'approximately five steps of insertion i 9 i

/ j. b Westinghouse Owners Group %d)O^* s? ' [// b)% Rod Control System Enhancement Program '[.% Surveillance Test Outline - Draft current orders. 6.29 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so. continue and complete rod drop testing of the bank. 6.30 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.31 While the Shutdown Bank A rod drop testing is in progress, connect the recorder (s) to the test points that monitor stationary, movable, and lift current for rod 1 in Shutdown Bank B. (Rod 1 in Group C in Power Cabinets 1BD and 2BD.) All test points are on panel A70 in the respective power cabinet. Channel 1 - 1BD, TP58 - Group C rod 1 stationary current Channel 2 - 1BD, TP62 - Group C rod i lift current Channel 3 - 1BD, TP66 - Group C rod 1 movable current Channel 4 - 2BD, TP58 - Group C rod 1 stationary current Channel 5 - 2BD, TP62 - Group C rod 1 lift current Channel 6 - 2BD, TP66 - Group C rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.32 Recorder adjustments (racommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.33 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately j five steps of withdrawal current orders. 6.34 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 10

hh p- ~ Westinghouse Owners Group p /?# ,4 T Rod Control System Enhancement Programw/ fj D % Surveillance Test Outline - Draft

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kp ,f Y 6.35 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.36 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 6.37 While the Shutdown Bank B rod drop testing is in progress, connect the recorder to the test points that monitor stationary, movable, and lift current for rod 1 in Shutdown Bank C. (Rod 1 in Group A in Power Cabinet SCD.) All test points are on panel A70 in the power cabinet. Channel 1 - SCD, TP50 - Group A rod 1 stationary current Channel 2 - SCD, TP62 - Group A rod i lift current Channel 3 - SCD, TP66 - Group A rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.38 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.39 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 6.40 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 6.41 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.42 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation ) 11

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/# /9,, ~ Westinghouse Owners Group Rod Control System Enhancement Program

gSy, Surveillance Test Outline - Draft c4' f are correct by evaluating the current traces against the criteria given in Section 7.0.

6.43 While the Shutdown Bank C rod drop testing is in progress, j connect the recorder to the test points that monitor stationary, movable, and lift current for rod 1 in Shutdown Bank D. (Rod 1 in Group B in Power Cabinet SCD.) All test points are on panel A70 in the power cabinet. Channel 1 - SCD, TP54 - Group B rod 1 stationary current Channel 2 - SCD, TP62 - Group B rod 1 lift current Channel 3 - SCD, TP66 - Group B rod 1 movable current There are 17 neutral test points on each A70 test panel, all are connected together and all are numbered 74. The signal common for each channel should be connected to a separate neutral bus test point. 6.44 Recorder adjustments (recommended only): Paper Speed - 10 inches per second (25 cm per second) Sensitivity - 1 inch per 500 mVolts (2.5 cm per second) 6.45 Request rod withdrawal to 100 steps. At any time during the withdrawal, start the recorder (s) and record approximately five steps of withdrawal current orders. 6.46 With the rods at 100 steps, request rod insertion to 80 steps. During the 20 steps of insertion, start the recorder (s) and record approximately five steps of insertion current orders. 6.47 Verify that the withdrawal and insertion recordings have been successfully obtained for the bank, and if so continue and complete rod drop testing of the bank. 6.48 While the rod drop testing is being performed, make an initial determination of whether the timing and regulation are correct by evaluating the current traces against the criteria given in Section 7.0. 7.0 Evaluation and Accentance Criteria The purpose of this test is to detect failures that may have 12

43 $ Sc h Westinghouse Owners Group

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'4)FJg2 .3 p, [)* Rod Control System Enhancement Program -o y. Surveillance Test Outline - Draft

)g occurred in the Westinghouse Solid State Rod Control System, which because they do not affect rod motion, may not be 1

detected by currently required surveillance tests which verify system operability by periodic verification of reliable rod motion. In general, the failures of concern are those which cause the current orders being sent to the mechanisms of each rod in a group or bank of rods, to deviate from the design value, but by an insufficient amount to affect rod motion. Detectability is required to eliminate the need to consider these failures in conjunction with other single failures, which when taken together, could impact rod motion. Incorrect current orders can be due to deviations in timing (generated in the Logic Cabinet), communications (between the Logic and Power cabinets)or regulation (within the Power Cabinet). The acceptance criteria address timing and amplitude of the current orders. 7.1 Timine Acceotance Criteria The system timing is generated from a pulser that uses 128 counts over a time period of 780 msec. This is 6.094 msec per pulse. All timing is expressed in terms of pulser counts. Table 7.1 shows the times that correspond to the pulser counts for each current transition point. Accootance Criteria Each current transition point shall be within 10 msec of the value given in Table 1 as determined from the calibrated recorder traces. This criteria allows for some error in the pulser calibration while assuring that failures which result in timing errors of more that one pulse (6.09 msec) will be detected. Timing failures that result in changes of only one pulse do not need to be considered in conjunction with other single failures. 13

Westinghouse owners Group n Rod Control System Enhancement Program . g _ Surveillance Test Outline - Draft j r j q,, - Gis !l ':~, ' ' ij J J Table 7.1 Withdrawal Cycle Stationary Gripper Current: Reduced to Full Current 6.1 msec (Step 1) Full Current to Zero Current. 195.0 msec (Step 32) Zero Current to Full Current 438.8 msec (Step 72) Full Current to Reduced Current 773.9 msec (Step 127) Lift Coil Current: Zero Current to Full Current 292.5 msec (Step 48) Full Current to Reduced Current 469.2 msec (Step 77) Reduced Current to Zero Current 621.6 msec (Step 102) Movable Gripper Current: Zero Current to Full Current 67.0 msec (Step 11) Full Current to Zero Current 560.6 msec (Step 92) Insertion Cycle Stationary Gripper Current: From Reduced to Full Current 6.1 msec (Step 1) Full Current to Zero Current 280.3 msec (Step 46) Zero Current to Full Current 578.9 msec (Step 95) Full Current to Reduced Current 773.9 msec (Step 127) Lift Coil Current: Zero Current to Full Current 6.1 msec (Step 1) Full Current to Reduced Current 213.3 msec (Step 35) Reduced Current to Zero Current 390.0 msec (Step 64) Movable Gripper Current: j i Zero Current to Full Current 188.9 msec (Step 31) Full current to Zero Current 688.6 msec (Step 113) 14

~ Westinghouse Owners Group F%. Rod Control System Enhancement Program

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fj?/] Surveillance Test Outline - Draft + u g., m 7.2 Amolitude Acceptance Criteria For purposes of detectability, it is the regulation of the current profile to full current that is important, Failures in regulation that result in the Stationary Gripper or Lift Coil currents only going to reduced, rather than full' current, can result in rods within banks responding differently to identical current profiles. Such failures to regulate can be the result of communications failures between the Logic and Power Cabinets, or from regulation failures within the Power Cabinet. The absolute value of' the reduced and full currents is not critical. Acceptance Criteria Each current shall fall within the following ranges: Stationary Gripper Current: Reduced current 4.0 - 5.3 amps Pull Current 7.2 - 9.6 amps Lift Coil Current: Reduced current 14.4 - 19.2 amps Pull current 36.0 - 48.0 amps Movable Gripper Current: Pull Current 7.2 - 9.6 amps The above are all steady state values. 7.3 Latch Ooeration The current profiles taken during this test give clear indications as to when the grippers have engaged and when the lift assembly has reached the fully raised position. These conditions are indicated by temporary reductions in the current which then recovers and stabilizes within the ranges given in 7.2. While not required as part of the surveillance Test, the following times may be useful in 15

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Rod Control System Enhancement Program a,f'[' g,j gia [ ~j Surveillance Test outline - Draft Sy y C determining that the time responses of the mechanisms are such that the standard system timing is appropriate to assure reliable mechanism operation. Withdrawal (Hot Conditions) Stationary Gripper Latches: Less than 125 ms Movable Gripper Latches: Less than 120 ms Lift Raises: Less than 180 ms Insertion (Hot Conditions) Stationary Gripper Latches: Less than 125 ms Movable Gripper Latches: Less than 90 ms Lift Raises: Less than 150 ms Should any mechanism fall outside the above response times, consult Westinghouse to determine if any action is recommended. 16 l

1 J ' l l to OG-93-109 Revision Pages to WCAP-13864, " Rod Control System Evaluation Program" e f I e 3 I 1 t i \\ i

Appendix 3B Failure Assessment - Revised Timing for.All Plants-System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date; Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 '9/3/93 9/1/93 Item Component f. ID Function Failure Mode. Effect on System Effect on Plant 1 Supervisory Logic 1 Provide strobed a. a. a. i PCB (A108) direction pulses, UPSPX fails When IN motion CRDMs in bank (s) UPSPX and DNSPX, low. demanded of any main selected for motion do to the slave bank, stationary and not move when IN' cycler decoders. movable decoders-motion demanded; i ~ Which strobe is ' produce OUT motion function normally when active (low) current orders, lift OUT motion-demanded. depends on state decoder produces IN of.UP direction corrupted IN motion signal. current order. Normal current orders when OUT motion demanded. b. b. b. UPSPX fails Current orders do not CRDMs in-bank (s) I high. change when OUT motion selected for motion do demanded of any main-not move when OUT bank. Normal current motion demanded; orders when IN motion function' norma 1ly when demanded. IN motion demanded. C. c. C. DNSPX fails' When OUT motion CRDMs'in bank (s) low. demanded of any main selected for motion do bank, stationary and not move when OUT movable decoders motion demanded; produce OUT motion function normally when current orders, 1ift IN motion demanded. decoder produces IN corrupted IN motion current order. Normal' current. orders when IN motion demanded. 4 .' 3 B-1

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Appendix 3B Failure Assessment - Revised Timing for-All Plants i System or Component: Drawing Prepared By Revieved By and Date: Reviewed By and Date: i Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 . Item Component f, ' I D Function Failure Mode Effect on System Effeet on Plant' d. d. d. DNSPX fails Current orders do not CRDMs in bank (s)' high. change when.IN motion . selected for-motion do demanded of any main _ not move when,IN bank. Normal current motion demanded; orders when CUT motion function normally when demanded. OUT motion demanded. 2 Movable Decoder PCB-Produce current a. a. a. s (A403) orders for MA1ACX fails Movable current orders CRDMs in IAC Power movable coils of low. to the LAC Power Cabinet cannot be selected rod Cabinet stay at ful1 moved due to Urgent-group in LAC current. Affected Alarm. (One group of ' t Power Cabinet. Power Cabinet produces bank selected for The MA signal.is >rgent Alarm due to motion does not move high-for full regulation error. in or'out.I current; its complement MAX is b. b. b. Iow for full MA1ACX falls Movable current orders-CRDMs'in LAC Power cu rrent '. Note high. to the IAC Power Cabinet.cannot be that the *MBa Cabinet stay at zero moved due to Urgent i signal is only current. When rod Alarm. (One group of 3 used for data motion' requested, LAC bank selected for logging purposes Power Cabinet produces motion does not move and does not iegent Alarm due to in or.out ) affect current togic error. orders. I ..h 3B-2 I t ' 'e'. J l l t. . I tv.3 l i N I A M i F * '.' ) -l i ' r e. D Pe "W te e tE.-e194-9 e--M er 1-+e'4e'tt-=^*%=>>$'-M*& t" T t W

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Appendix 3B Failure Assessment - Revised Timing for All Plants System or' Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Dat e: Rod Control System bogic

Reference:

and Date: S. K. Fowler R.- Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant C. C. C. Diode failure tio effect for counts tio ef f ect on rod causes MA1ACX 15, 27, 43, e.ad 75

movement, to set at because MA latch is another count already set at count in addition 11 and not reset until to 11 of OUT count 52.

motion slave Insignificant timing cycle change for counts 3, (possible 9, and 10. counts are 3, 9, 10, 15, 27, 43, 75). d. d. d. Diode failure tio effect for counts No effect for counts causes.MA1ACX 93, 94, and 124 76, 84, 88, 93,'94, to reset at because the MA latch and 124. Power another already reset at count Cabinet, Urgent-Alarm count in 92. Reset at counts on count 28 will~ addition to .7 6, 84, and 88 allow prevent one group in 92 of OUT stationary gripper bank selected for motion slave enough time to engage motion from moving cycle rod. Reset at count out. - tio etfeet on I 11 (possible 28 will produce zero motion. counts are moving current order' 28, 76, 84, when stationary 88, 93, 94, current order'is also 124). zero and result in logic error Urgent Alarm in LAC Power Cabinet. I 13B-3 x y ilt .tmatixt.*.q t.- b Mi n. s er,... n. s a ,p.r. ws, m ,,wme,,w., ,e l, y..w -a ,,y gg,_.y ,e,m..y.,, w, y ~ 1-. .e. . w na.-- n-. n. .a .u e....- n x

L Appendix 3B 4 Failure Assessruent - Revised Timing f or All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S.'K. Fowler R. Staney 4 Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93' 9/1/93' Item Component L ID Function Failure Mode Effect on System Eftect on Plant .} e. e, e. Diode failure No effect for counts flo effect on rod causes MA1ACX' 63 and 95 because the movement. to set at MA latch already set another count at count 31. No. in addition effect at 15, 23, 27, to 31 of Ill 29, and 30 due to motion slave insignificant timing cycle changes. (possible counts are 15, 23, 27, 29, 30, 63, 95). ' f. f. f. Diode failure No effect for counts tio effect for counts-causes MA1ACX 115, 117,-and 121 112, 115, 117 and to. reset at because the MA latch 121. Power Cabinet another count already reset at count. Urgent Alarm.on counts in addition 113. Reset at counts 49 ot 81 will prevent to 113 of IN 49 or 81 will produce one group-in bank motion slave-zero moving current selected for' motion cycle order when stationary-from moving in. Reset (possible current order is also on count 97 places counts are. zero and result in-stationary and movable -49, 81, 97, -logic error Urgent grippers in race, but.. - t 112, 115, Alarm in 1AC Power-movable' gripper always 117, 121). Cabinet.. Reset.on wins and no rods are l count 112 is dropped. Flo etfect on insignificant change. 'OUT motion. Reset on count 97 is close-to set of stationary current, e 3B-4 .e : v.: tin -animirlx ane e-h. - ei. s E hi m sesswhz.a w 1>a.-m t see 16 us'eP+1~e>+ =*6tW*-TM*-+1 "1W-T-f;=-+-#-- -94' rest-T*e&--*P --tm%'- sr w 1

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.~ Appendix 3B Failure Assessment - Revised Timing for All Plants System or. Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date:,. Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet .6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 r Item Component & ID Function Failure Mode Effect on System Effect on Plant g. g. g. UPSP internal For OUT motion of Following OUT motion, to decoder is groups associated with same effect as 2.b. always low, LAC Power Cabinet, (One group in bank same effect as 2.b. selected for motion tio effect on Iti wil1 not move out.); motion. tio ef f ect on Ill motion. h. h. h. UPSP internal For Ill motion, MA sets For_It1 motion, Power i to decoder is and resets on OUT Cabinet Urgent alarm always high, counts (11 and 92). prevents one group in LAC Power Cabinet bank selected for produces logic error. motion from moving in. No etfect on OUT tio etfect on OUT motion. motion. i. i. i. D?iSP internal For Ifi motion, same Following'It1 motion,- to decoder is effect as 2.b. for: same effect as 2.b. always low. groups associated with (One group in bank 1AC Power Cabinet. -No selected for motion effect on OUT motion. will not move.) j. j. ~j. DflSP internal flo effect on Ill or-OUT tio effect on It1 or OUT to decoder is motion because for OUT motion. always high. motion, OUT motion current orders are produced. 4 3B-S e: -w a io.sn.-setix1.wie is + i. n. '.,-,a --,-. - - + -. -..., - ~ .w,r n.,.>-r,'- ,r~-, .~~--., ~. - -,, - .--,e---..-.. ..~-,,..--~n.-n,---,-.~..-. ,,n..~.-- ---n. n --n--.---...---,.n:

Appendix 3B Failuie Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component &-ID Function Failure Mode Effeet on System Effect on Plant - + k. k. k. DECODE 11 For OUT motion, MA For OUT motion, always high. latch remains set movable gripper until end of cycle. assembly does.not tio effect on It3 attempt to release motion. until after end of cycle, thus affecting reliable CRDM operation on the following cycle. There is also a friction effect_that_ can inhibit the movable gripper from releasing if the lift coil releases the movable gripper - i assembly. prior to the movable grippers releasing. Either one or more rods in- . [ effect can resul_t..in one group in the bank-selected for motion mis-stepping. 1. I '. ' l. DECODE 11 For OUT motion, same-For OUT motion, same. always low. effect as 2.b. IJo eff'ect as 2.b (one effect on IN motion. group of rods in bank selected for motion does not move out). fio etfect on - Ill motion. 3B-6 i : w.4 i t i., i m-a n i r t. 4 e p. .ini n. -g-171 .is .e.emrA.*-beu etaw-e eywe-wT-ser ?--' >4im.e p4 e WM*W Er T N-1 %T*-=e@ver* 9 - @T

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Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By'and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney. Cabinet 6056D01 Rev. R' A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID. Function Failure Mode Effect on System Effect on Plant m. m. m. DECODE 31 For I11 motion, MA For IN motion, 1ift always high. latch sets on count I and movable coils in-and remains set until. race, which movable end of cycle. tio always wins. When effect on OUT motion. -lift energizes,- rod is under tension. When stationary coil is deenergized, the 1ift current is at. reduced leve1 and cannot 1ift rod. Thus, one group of rods in bank selected for notion does'not move in. tJo etfect on OUT motion. 'n. n, n. DECODE 31'- For IN motion, same For 111 motion, same always low. effeet e.s 2.b. tio etfect as 2.b (one effeet on OUT motion. group of rods in bank selected for motion does not move in). tio etfect on OUT motion. o. o. o. DECODE 92 For OUT motion,'MA For OUT motion, same always high. latch cannot set, gr6up of rods i.. bank effect as 2.b (one producing same-effect as 2.b. tio effect.on selected'for:mution do III mot ion. not move outI. tio effect on 111 motion. t- -- 3 B : w -g. : 1. : % i:d wt t - F - t i c i *.- .,. _... ~,~;.~. ..._,_..,,....L.__..__,,.. m.. ....m.L.. ,_.,_.,,_..L._....___, ,-_._..,__..R

Appendix 3D-Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Dater Reviewed By and'Date: Rod Control System Logic Reference and Date: S. K. Fowler' R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant p. p. p. DECODE 92 For OUT motion, t% Same'etfect as 2.k i always low. latch cannot reset, (one or more rods in producing same etfect one group in the bank as 2.k. tio effect on selected for motion IN motion. mis-step). q. q. q. DECODE 113 For IN motion, tu For It1 motion, same always'high. latch cannot set, etfect as 2.b (one producing same etfect group of rods in bank as 2.b. tio ef f ect on selected for motion OUT motion. does not.aove in). No effect on OUT motion. r. r. r. DECODE 113 For IN motion, f% Rods step in; however, always low. latch cannot reset movable-gripper not until end of cycle. released until after No effect on OUT end of cycle. -Because-motion. the-movable gripper does release-betore the'1ift engages.on subsequent cycles, there is no etfeet on Ill or OUT motion. L i 4 4 3D.# a. r l i :i m.,

i >:1. y r. P.? i n t : 4..

~ m. m ~.,,,. -, _,.,.... ...,._.,.m.,_ s....

ut Appendix 3B Failure Assessment - Revised Timing for All Plants' ~ System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic Refetence: and Date: S. K. Fowler R. Staney ' - Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 '9/3/93 9/1/93 Item Component L ID Function Failure Mode Effect on System' Effect on Plant 3 Lif t Decoder PCB Produce current a. a. a. (A402) orders for lift LA1ACX fails Lift current orders to CRDM lift coils in coils of' selected low. the 1AC Power Cabinet affected groups keep rod group in LAC remain at reduced movable gripper Power Cabinet. current during no assembly continuously The LA signal is motion and switch raised. Group of rods high for lift between reduced and ' in bank selected for current.and low full current during motion does not move. for no lift motion cycles. current. The LB ~ signal is high_ b. b. b. for full current LA1ACX fails Lift current orders to CRDMs in affected and low for high. the LAC Power Cabinet Power Cabinet cannot reduced current. stay at zero current. be moved due te zero lift. current. Group of rods in bank select ed f or mot ioni does a. t move. c. c. c. LBIACX fails Lift current orders to CBDMs in LAC Power low. the 1AC Power Cabinet Cabinet will produce stay at full current. extra heat, but no longer during motion immediate etfeet on

cycle, rod motion.

d.. d. d. LBIACX fails Lift current orders to CRDMs in IAC Power high. the 1AC Power Cabinet . Cabinet unable to cannot produce full . insert or withdraw current command. rods. Group of rods in bank selected for i motion does not move. e 3D.9 - ei'w q.e1:e_tp uttxt.y a e, ' i s i r.. s A~ .-~,__.c, .., J y. m.. .Z -. ;. -.,,,..._,,4,.,,~. .m . m

e b Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Dater Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item' Component t. ID Function Failure Mode Effeet on System Effect on Plant e. e. e. Diode failure No effect for counts No effect for counts causes LA1ACX 49, 50, 52, and 56 32, 49, 50,.52, and to set at because the LA-latch 56. For count 6, one another count already set at count or more CRDMs-in one.

in addition 48.

Set at count 16 . group of bank selected to 48 of OUT will result in for motion may'not motion slave corrupted current move out, especially . cycle orders similar to if the rods are on the 1 (possible Salem event. Set at bottom. For count counts are count 112 will remain 112, the movable t 16 -32, 49, set until end of gripper' assembly is 50, 52, 56,- cycle. Set at count 32 raised at the end of 112). Note causes minor shift i n.. the cycle. For fast this failure timing. No effect on (>70 spm)-rod speeds, also affects IN motion. one or more rods'in' setting of group selected for LBX signal. motion may not move out. No effect on IN motion. T t s ' %~. - J. t I t.,t he -J I I K I. M I Ft 1 int ta, m -..m. m.m..m. ' E m m m ,m.,,, c, ..r t .w.. .r..r m. ,,,m,_ m, m.,,

Appendix 3B Failure Assessment - Revised' Timing for All Plants s System or. Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney 2 Cabinet 6056D01 Rev. R A. J. Baker. 9/2/93 9/3/93. 9/1/93 Item Component & ID Function Failure Mode Effect on System Effeet on Plant t. f.. f. Diode failure-No effect for counts No effect for counts causes LA1ACX 103, 110, and 118 38, 98, 100, 103, 110, to reset at because the LA. latch or.118. For count.70, another is already reset at ' lift current is count in count 102. No effect deenergized betore-addition to at count 38 because movable gripper 102 of OUT the LA latch is not assembly is. raised. motion slave set until count 48. One group of rods of cycle Reset at count 70 bank selected for (possible significantly advances motion does not move counts are lift current out. No efiect on IN 38, 70, 98, deenergization. Reset motion. 100, 103, at counts 98 and 100 110, 118). is an insignificant change. No etfeet on ^ IN motion. g. g. g. Diode failure No effect for counts No effect for counts causes.LA1ACX 3, 5, 9, 17, and 33-0, 3, 5, 9, 17, or 33. to set at because the LA latch For count 65, the 4 another count 'already set at count movable gripper in addition 1. Set at count 65 assembly will stay to 1 of IN will produce full raised to the end of a motion slave current order until IN motion cycle. One cycle end of cycle. No group of rods.in bank (possible etfeet for reset.at selected for motion counts are count 0, because the. doss not: move in. No -t 0, 3, 5, 9, uA latch is not set effect on OUT motion. 17, -- 3 3, - ~ 6 5 ). until' count 1. No Note this effect on'OUT motion. failure also affects setting of LDX signal. 38-11 a:.v -1 tit-In.-seti>.I. q t F.~" i t; l et. e ~,- -.:-.-.. - -.. -. + ...a

Appendix 3D .g Failure Assessment - Revised Timing for All Plants System or Component: Drawing' Prepared By Reviewed By and Date: Reviewed By and Date:, Rod Control System Logic Refetence: and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant h. h. h. Diode failure tio effeet for counts fio effeet on Ifi or OUT causes LA1ACX 65, 66, 68, 72, 80, or motion. to reset at 96, because the LA another count latch already reset at in addition count 64. tio et f eet to 64 of Iti for reset at count 0, motion slave because the LA latch cycle is not set until count (possible 1. tio etfeet on OUT counts are motion. O, 65, 66, 68, 72, 80, 96). i. . i. i. Diode failure-tio effect for counts lio effect on rod causes LBlACX 71,.75,'83, or 99,- motion. to reset at because the LB latch another count .is already reset-at in addition count 67. fio effect to 77 of OUT for count 3, because motion slave . the LB-latch'is not-cycle set until count 38. (possible Insignificant change counts are in~ timing for counts 13, 59 73, 65 and 66. tio effect 76 7 9,.'. 9 3, on Iti motion. L. '3B-12 ei & J'tli.tmutlxtla i. wctsi <..- J - h mmm a-a mma-u-"sw9,e*Re-meem -W-WNT+-+ed D'%-*F sw-Wevew wM w er ww44w*4*Mr--w evtw w +-w'twwe- -'e9,-@ w.W t-em A 4

T=*dvN"-'

w WM-1hw-N-+rCe-w -ww -mws.

4 Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component f, ID Function Failure f4 ode Effect on System Effect on Plant i-j. i. Diode failure tio effact for counts tio effect for. counts causes LBlACX 39, 43, 51, or 99, 33,~34, 39,.43,'51, or to reset at because LB latch is 99. For count 3, one another count already reset at count group of rods in bank in addition 35. Insignificant selected for mot. ion to 35 of Iti change in timing for does not move in. 'llo. motion slave counts 33 and 34. For effect on OUT motion. cycle count 3, lift current (possible never reaches full counts are current. !1o effect on 3, 33, 34, OUT motion. 39, 43, 51, 99). k. k. k. UPSP internal For OUT motion, same For OUT motion, same to decoder is effect as 3.b. tio effect as 3.b lone always low. effect on IN motion. group of rods in bank selected for motion does not move out). + tio a f f ect - on Ill motion. 1. 1. l UPSP internal-For It1 motion, same For Iti motion, same to decoder is corrupted lift signal effect as 3.c (minor always high. as Salem event, but CRDt4 heating). tio combined with normal effect on rod motion. 113 orders from stationary and moving decoders, same effeet as 3.c. tio etfect on OUT motion. 3B-13 ._9 t l e ^. t me.i t e x t. wr 1 P-v i d i -n - s: w __._ _._ _ _ _ _ _ _..,. ~ _. -... _ _ _... _.. _ _.. __-

t Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Dat e: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component 6-ID Function Failure Mode Effect on System Effect on-Plant m. m. m. DNSP internal For IN motion, same For IN motion, same 2 to decoder is effect as 3.b. No effect as 3.b (one l aIways low. effect on OUT motion. group of-rods in bank.- selected Ior motion does not move out). No effect on OUT l motion. n. n. n. i DNSP internal For OUT motion, the One or more rods in to decoder is lift current order is one group of bank always high. the same as Salem selected f or mot ion waveform for affected may not move out, slave cycler. No especially when rods effect on IN motion. are on the bottom. No effect on IN motion. o. o. o. DECODE 48 is For OUT motion,- LA and' For OUT motion,'. lift always high. LB latches set for coils of. selected entire cycle. No. group in LAC Power effect-on IN motion. Cabinet remain at full current, which keeps the movable gripper ~ dsSembly raised during-the cycle. One' group of rods in bank selected for' motion does not move out. No j eftect on IN motlon. '3B-14 t t '.w 4 t i t '. t uw.s t b: t.wt t - P e.itti.ii. ..,...-me.-- .,s--- e. ww,-- .-..we,a

m.-<e 4.c re y

,--r, e i-e--.-- -co-,m4.. - 5.e ,-eT w -m.--y ---m.-%. . + * ,me,-, .-r__, i,- e,'.---[. ..-,m...-, _.,_....m

Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed'By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev.. R -A. J. Baker 9/2/93 -9/3/93 9/1/93 Item ' Comporten t I, ID Function Failure Mode Effect on System Etfect on Plant P-P- P. DECODE 48.is For OUT motion, LA and For OUT motion, same always low. LB latches ca:.not set, effect as 3.b.(one producing same effect group of bank. selected as 3.b. No effect on for motion does not It1 motion. rr.ove out). No effect on IN motion. 9 9-9 DECODE 1 is For Ili motion, LA and For IN motion, lift always high. LB latches set for coils of selected entire cycle. No group in LAC Power-etfect on OUT motion. Cabinet remain at fu11

current, which keeps the movable gripper assembly raised during the cycle.

One group of rods in. bank selected for motion does not move in. No 'effect on OUT motion. r. r. r. DECODE 1 is For IN motion,'LA and For IN motion, same always low. LB latches cannot set, effect as 3.b (one producing same etfect group of rods in bank as 3.b. No effect on selected for motion OUT motion. does not move-in). tio effect on OUT motion. 3B-IS- . i.i 3. 4 s t i :,im.un ix t.y - Pie t n. ~. -. _, ~

Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Etfeet on Plant s. s. s. DECODE 77 is For OUT notion, the LB For OUT motion,.same always high. latch car.not set, etfeet as.'3.d (one i producing same effect group of rods in bank' as 3.d. No effect on selected for motion IN motion. does not move out). No effect on IN motion. t. to t. i DECODE 77 is For OUT motion, the LB For OUT motion, same always low. latch remains set, effect as 3.c (minor producing same effect CRDM heating). No as 3.c. No effect on effect on~IN or OUT IN motion. motion. i u. u. u. DECODE 35 is For IN motion, the LB For IN motion,' same always high. latch cannot. set, effect as 3.d (one producing same effect group of rods.in bank as 3.d. No effect on selected for notion OUT motion. does not move in). No l effeet on'OUT motion. v. v. v. DECODE 35 is For IN motion, the LB For IN motion, same always low. latch remains-set,. effect as 3.c tone-producing same.etfect group of rods in bank.. as 3.c.. No effect on selected for motion OUT motion. does not move'in). No l-effeet on OUT' motion. i l' 3B-16~ t:.w.. J t i t ' t be a i ii l N1 t. N Jlui u. ..~--..--.~-~ -.. .J., ...,w .... -. =, - - J.--

Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01'Rev. R A. J. Baker 9/2/93 .9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System. Effect on Plant' w. w. w. DECODE 102 is For OUT motion, the.LA For OUT motion,-same always high. latch'cannot set, effect as 3.b (one producing same effect group of rods in bank as 3.b. No effect on selected for motion IN motion. does not move out). No effect on IN motion. X. X. X. DECODE 102 For OUT motion, the LA For OUT motion, always low. latch does not reset movable gripper until the end of assembi) will not drop e cycle. No effect on until after end of IN motion. cycle. For fast rod speeds,-can result in one or more rods in one group of bank selected for motion not moving out'on subsequent OUT motion cycles. No effect on IN motion. Y. Y. Y. DECODE 64 is For IN motion, the LA For IN motion, same always high. latch:cannot set, effect as 3.b (one. producing same effeet group of rods in. bank as 3.b. No effect on selected.for motion OUT motion. does'not move in)..No effect on OUT motion. i- ~3 B-17

:,w. ;J. t i n :. t rhea t i x l. wg t tw i s t

-n. ... _.. _. ~.:...,c u .u. --- c

Appendix 3B Failure Assessment - Revised Timing fo* ' 11 Plants System or Component: Drawing Prepared By Reviewed By J.nd Date: Reviewed By and Date: Rod Control. System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant j z. z. z. DECODE 64 is For IN motion, the 1A For IN motion, movable always low. latch does not reset gripper. assembly does unti1 the end of not drop unti1 after cycle. No effect on end of cycle, OUT motion. resulting in one group of rods in bank selected for motion. not moving in. .Can cause mis-stepping if OUT motion immediately after IN motion; otherwise, no effect on OUT motion. 4 Stationary Decoder Produce current a. a. a. PCB (A401) _ordars for SA1ACX fails Stationary current One group of rods in-stationary coils low. orders to the 1AC bank selected for of selected rod. Power Cabinet are at motion does not move group in LAC full current when IN or OUT motion Power Cabinet. throughout the rod demanded. The SA signal is movement cycle, high for stationary b. b. b. current and low SA1ACX' fails Stationary current' One group of rods in for no' stationary high. orders to the 1AC bank selected for current. The SB Power Caninet stay at motion does not. move . signa 1 is high zero current. when IN or OUT motion for full current. Affected Power Cabinet demanded, due to and low for produces. Urgent Alarm Urgent Alarm. reduced current.

due to logic error.

Attempts'to reset the- ~ Urgent Alarm without-correcting t he curr ent ' order failure results. in dropping rods. I 3B-18

: x -J i t i e t m, a fix t % t - Peris t n.

M i .u .m.. . _ _ -. ~. - -.,. _.. _.. _. _. _. - - _..., _. _ _... _,..,. - u.. ..--...a...u..

J Appendix 3B Failure Assessment - Revised Timing for All Plants 4 System or Component: Drawing Prepared By Reviawed By and Date: Reviewed'By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fo* * ' ' r R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/03 9/3/93 9/1/93 Itern Component & ID . Function Failure Mode' Effect on System Effect on' Plant c. c. c. SBIACX fails Stationary current One group of rods in low. orders to the 1AC bank selected for Power Cabinet stay at motion does not move full current-during no when IN or OUT motion motion. Affected demanded, due to-Power Cabinet. produces Urgent Alarm. Urgent Alarm due to regulation error. d. d. d. SB1ACX fails Stationary current Rods will step as-high. orders to the 1AC commanded. Probable Power Cabinet cannot loss of load transfer-produce full current will increase CRDM j command. wear rate. No effect on rod motion. e. e. e. Diode failure No effect for count 8 No effect on rod causes SA1ACX because the SA latch-motion. to set at initially set at count another. count-1. No effect for in addition counts 73, 74, 76,- 88, to 72 of OUT and 104 because'the SA motion slave latch is again set at cycle count 72. (possible Insignificant timing counts are 8, changes.for count 64. 64, 73, 74, No etfeet on IN l 76, 88, 104). motion. i 3B-19 1: y -a _ f i t e. f m-a.i t 6 x t. wl i F.e l: i-n. e L u-.. ,,-etr.*,~ .s m,,3wn m. .ew-.+sw. m-4.w,--...h=. men.e r -.ew,. -c ge, y a.- ..m.c 53.. .w-. -t w,,. .,U .,wwv. ,--c.

Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Dateg Rod Centrol System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev, R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant t. f. f. Diode failure No effect for counts No ef t for counts causes SA1ACX 33, 34, 36, 40, and 48 0, 3a 6,.40, and to reset'at because the SA latch 48. For OUT motion, another already reset at count-Power Cabinet Urgent count in 32. Reset at count 96 Alarm on count 96 addition to will produce zero prevents one group of 32 of OUT stationary current. rods in bank selected motion slave order when moving for motion from moving cycle current order is also out. No effect on IN (possible zero and result in motion. counts are Urgent Alarm in IAC 0, 33, 34, Power Cabinet on logic 36, 40, 48, error. Reset at count l' 96). O has no effect because cycle has not begun. No etfect on

~

IN motion. j 6 L t 3B-20.

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Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By'and Date, Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant 9-g. for counts' No effeet for counts. g. Diode failure -No effect causes SA1ACX 47 and 62 because the. 38, 42, 44, 47 and 62. to reset at SA latch already reset (Even for count 38, another count at count 46. Reset at movable gripper in addition counts 14 or 110 will engages before to 46 of IN produce zero stationary gripper motion slave stationary current releases.) Power cycle order when moving Cabinet Urgent Alarm (possible current order is also on counts 14 and 110 counts are zero and result in-prevent one group of 14, 38, 42, Urgent Alarm in LAC .~ rods in the. bank 44, 47, 62, Power Cabinet on logic selected for motion 110). error. Reset at from moving in. No counts 38, 42, and 44 effect on OUT motion. resets the stationary current early. No effect'on OUT motion. 3B-21

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Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic References and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant h. h. h. Diode failure No effect for counts No effect for counts causes SA1ACX 31 and 127 because the 31, 87, 91, 93, 94, to set at SA latch already set' 127 For count 79, another count at counts 1 or 95. the stationary gripper in addition Insignificant timing and movable gripper to 95 of IN changes for counts 87, assembly are in a motion slave 91, 93, and 94. For race. If the movable cycle count 79, the gripper assembly drops (possible stationary current is before the stationary counts are energizing close to gripper engages, the 31, 79, 87, when lift current is rod (s) insert; if the 91, 93, 94, deenergized. No stationary gripper 127). effeet on OUT motion. engages before the movable gripper assembly drops, the rod (s) do not move. Thus, one or more rods in one group of the bank selected for motion may not move in. No effect on OUT motion. i. i. i. CYlACX fails Stationary current No effect on IN or OUT to set SB1ACX order remains at motion because the at beginning reduced level until stationary gripper.is of IN or OUT count 32 (OUT) or.46' already engaged when motion cycle. (IN) and energizes at full' current is not full at count 72 (OUT)- available. or 95 (IN). 3B-22

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Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control' System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Etfect on System Effect on Plant j. j. j. 4 R1ACX fails Stationary current 1AC Power Cabinet to reset-order remains at full produces Urgent Alarm SBIACX at end current after cycle, on stationary of IN or OUT regulation error.. One motion cycle. group of rods-in bank selected for motion does not move for IN or OUT motion. k. k. k. UPSP internal For OUT motion, same For OUT motion, same to decoder is effect as 4.b. No effects as 4.b (One always low. effect on IN motion. group of rods in bank selected for motion does not move out), except Power Cabinet Urgent. Failure can be . reset. No effect on IN motion. 1. 1. 1. UPSP internal For IN motion, For IN motion, IAC to decoder is stationary decoder Power Cabinet. produces always high. produces OUT current-Urgent Failure on order. No effect on logic error, OUT motion. preventing one group of rods in bank selected'for motion from moving in. No effeet on OUT motion. 3B-23 r: '.wcq,1 t r c*, f mea f lxilwpf - Pv/isi$n. 6

Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and,Date: Rod Control System I,ogic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effeet on System Effect on Plant m. m. m. DNSP internal For.IN motion, same For IN motion, same to decoder is effect as 4.b. No effects as 4.b (one always low. effect on OUT motion, group of-rods in bank selected for motion does not move in), except Power. Cabinet Urgent Failure can be i reset. No effect on OUT motion. n. n. n. 1 DNSP internal No effect on IN or OUT No effect on IN or OUT to decoder is motion because for OUT motion. always high. motion, combining UPSP and DNSP signals results in OUT current orders.- f o, o. .o. DECODE 32 is For OUT motion, SA For OUT motion, same always high. . latch cannot set, effect as 4.k.(one producing same effect group of rods in bank as 4.k. No effect on selected.for motion IN motion. does not move out). No effect on.IN. motion. '3 B-24 r:\\wog.!Ircifmeat1x1.wpf-Revisicn. O. . :. a.. - u .. i

Appendix 3B Failure Assessment - Revised Timing for All Plants 'L System or Component: DrawAng Prepared By Reviewed By and Date: . Reviewed.By and Date: Rod Control System Ieric Referencer and Date: S. K. Fawler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component'& ID Function. Failure Mode Effect on System Effect on Plant ~ I p. p-p. DECODE 32 is For OUT motion, SA For OUT motion, same-always low. latch cannot reset, effect as 4.a (one producing same effeet group of rods in-bank as 4.a. No effect on selected for motion IN motion, does not move out). No effect on IN motion. 4 9 9-9 DECODE 46 is For IN motion, SA For IN motion, same always high. latch cannot set, effect as 4.k (one producing same effect group of rods in bank as 4.k. No effect on selected for motion OUT motion. does'not move out). No effect on OUT motion. r. r. r. DECODE 46 is For IN motion, SA For IN motion, same always low. latch cannot reset, effect as 4.a (one ~ producing same effeet group of rods in bank' as 4.a. No effect on selected for motion OUT motion. does not move out). No effeet on OUT motion. s. s. s. DECODE 72.is. For OUT motion, SA and For OUT. motion, same always high. SB latches are set for effect as 4.a (one entire cycle, group of rods in bank producing same effect. selected for motion as 4.a. No effect on. does not move out). IN motion. No etfeet on IN motion. 3B-25

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4 Appendix 3B Failure Assessment - Revised Timing for.All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewec By and Date:' Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R" A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant t. t. t. DECODE 72 is For OUT motion, SA For OUT motion, same-always low. latch is not set, es.fect as 4.b (one 'l producing same effect group of rods in bank i as 4.b. No effect on selected for motion IN motion. does not move out). No effect on IN motion. u. u. u. DECODE 95 is For IN motion, SA and 'For IN motion, same always high. SB latches are set for effect as 4.a (one entire cycle, group of rods in bank. producing same effect selected for motion 'as'4.a. No effect on does not move out). OUT motion. 'No effect on OUT motion. v. v. v. DECODE 95 is For IN motion, SA For IN motion, same always low. latch is not set, effect as 4.b (one producing same offeet group of rods in bank as 4.b. No effect on-selected for motion OUT motion. does not move 1in). No etfeet on OUT motion. t 5 I/O AC Amplifier couple current a. a. a. PCBs-(P/O A803, orders from slave Output same effect as 4.a. Same.effect as 4.a A805) cycler decoders associated (one group of rods in to LAC Power with "SA* bank selected for

Cabinet, signal short motion does not move circuits.

in or out). 4 t y:qiflec;tmeaf1x1.wpf Pevistan. U. 3B-26 ..w.. .s. . + + - -. - + - - + = e ..w--. m+ y . ~, -. -

s Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control Systerte Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant '.1 b. b. b. Output Same effect as 4.b. Same effect as 4.b associated (one group of rods in with "SA* bank selected for signal open motion does not move-circuits. in er out due.to logic error). c. c. c. Output Same effect as 4.c. Same effect as 4.c associated (one group of rods in with "SB* bank selected for signal short motion does not move circuits. in or out due to regulation error). d. d. d. Output Same effect as 4.d. No effect on IN or OUT associated motion. with "SB* signal open circuits. e. e. e. Output Same effect as 3.a. Same effect as 3.a associated (one group of rods in with "LA* bank selected for signal short motion do not move in circuits. or out). I 3B-27 l

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Appendix 3B Failure Assessment - Revised Timing for All Plants 1 4 System or Component: Drawing Prepared By Reviewed By and Datet Reviewed By.and Date: Rod Control _ System Logic

Reference:

and Date: S. K. Fowler R. Staney-Cabinet 6056D01 Rev. R A. J. Baker 9/2/93 9/3/93 9/1/93-Item Component & ID' Function Failure Mode Effect on System Effect on Plant i f. f. g. Output Same effect as 3.b. Same effect as 3.b associated (one group of rods in with *LA* bank selected.for signal open motion does not move circuits. in or out). g. g. g. Output Same effect as 3.c. No effect on rod associated

motion, with "LB' signal short circuits.

h. h. h. Output Same effect as 3.d. Same effect as 3.d associated (one group of rods in with "LB" bank selected for signal open motion does not move circuits. in or.out). i. i. i. Output Same effect as 2.a. Same.effect as 2.a associated ~(one group of rods-An with "MA* bank selected for signal short motion does not move-circuits. in or out due to regulation error)'. i 3B-28 rt',wog.ttreifmeatix1.wpf ' Revision. O - ~. .~c ..~.. .u -

1 Appendix 3B Failure Assessment - Revised Timing for All Plants System or Component: Drawing Prepared By Reviewed By and Date: Reviewed By and Date: Rod Control System Logic

Reference:

and Date: S. K. Fowler R. Staney Cabinet 6056D01 Rev. R A..J. Baker 9/2/93 9/3/93 i. 9/1/93 Item Component & ID Function Failure Mode Effect on System Effect on Plant j. j. i. Output same effect as 2.b. Same effect as 4.b associated (one group of rods in with "MA* bank selected for signal open motion does not move. circuits. in or out due~to logic error). l 3B-29' r:\\wogifire'fmeatix1.wpf P.evision. O

Appendix 3B Failure Assessment - Revised Timing for All Plants L 4 I i l l-r i I' ? l ~ ~ .r:iwogiffreitmeatix1.wpf Revision..O l l . - ~ a

1 L-106 - MECHANISM TIMING AND UNCERTAINTIES WITHDRAWAL CYCLE - REVISED TIMING k%% \\\\1 LIFT ort is E"t5"o'S *$'uso"o*lfo"v'Eueur 4. 7e n jRESET 9 102 MG

si

92

^* '""R HAVE NO EFFECT 3 P SG l l l ~ O 10 20 30 40 50 60 70 80 90 100 110 120 130 COUNTS l l l NOT LATCHED /NOT PULLED IN LATCHED / PULLED IN N N INDETERMINATE FAILURE 3.f sxrossau FIGURE 3B-10 .}}

ML20059C228

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