ML20236X359
| ML20236X359 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/31/1987 |
| From: | Gough E, Sandra Talley, Vinquist J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML20236X352 | List: |
| References | |
| PROC-871031, NUDOCS 8712090142 | |
| Download: ML20236X359 (157) | |
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Enclosure To GCA 87-780 WIRE AND CABLE PROGRAM REPORT RANCHO SECO NUCLEAR GENERATING STATION SACRAMENTO MUNICIPAL UTILITY DISTRICT SACRAMENTO REVISION 3 SEPTEMBER /0CTOBER 1987 PREPARED BY: APPROVED:
/* 4 CA. N'el){
CRTS PROGRAM COORDINATOR a4x' fx -
MA9ACER OF ' QUALITY DEPARTMENT S. R. Talley J. V. Vinquist ;
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/J. C% l CRTS PROGRAM MANAGER fiANAGER OF NUCLEAR ENGINEERING E. J. Gough G. V. Cranston 4? -1 -
871209014287g32 DR ADOCK O p
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a Enclosure.
.i. , - To GCA 87-780
, WIRE AND CABLE PROGRAM REPORT 1 ,
- 1. INTRODUCTION. .I f '
The Rancho Seco Nuclear Generating Station at plant turnover in 1975 had a cable population of about 14,000 cables installed,mostly in_ ladder type cable c t av and in steel conduit. Since 1975 about 9,000 cables have been added while i a rew have been deleted.
In common with all large modern power plants in the United' States, Rancho Seco tracks its' raceway and cable data in a computerized program run on a main. frame computer. The current program has an acronym of CRTS (Cable Raceway Tracking System) and performs some checks and calculations as well as recording and reporting data. CRTS has been in place since.. July of 1980.
'The original cable population of 14,000 was installed by Bechtel Power Corporation (BPC). BPC was both designer and constructor. Until the CRTS program was put in place in 1980, the cable and raceway was tracked by a BPC
-Program EE-553. This program has-been used for over 20 nuclear power plants.
- 2. BACKGROUND DISCUSSION 2.1 INITIATING EVENTS' Although some questions concerning CRTS completeness, missing CRTS cards and conflicting procedures were raised by resident inspect' ors as early as 1983, major concerns did not arise until 1985 and 1986. In 1985 questions arose concerning the degree of design control exercised following spurious ,
actuations reported in LER 85-16. In 1986 questions arose concerning the ./
degree of. control exercised during the installation process and the validity of "as-built" information in the CRTS data base following issuance of LER 86 10. Employee allegations regarding overfilled cable trays and incomplete data in-CRTS, added to-the level of concern.
The July Wire and Cable Program Report contained 56 CRTS Action Items, including entries for 16 NCRs and 12 ODRs. The August Report was reformatted and lists ODRs and NCRs separately from the CRTS Action Item List [ Attachment (1)]. CRTS Action Items 1 through 22 remain the same, Item 23 of the July Report is now listed under NCR S-5270 in the CRTS NCR List, Items 24 and 25 of the July Report have been combined and are now ,
Item 23. ODRs and NCRs listed as Items 26 through 52 of the July Report are now listed by the appropriate ODR or NCR number in either the CRTS ODR List [ Attachment (2)} or the CRTS NCR List [ Attachment (3)] as
- appropriate. CRTS Action Items 53 through 56 of the July Report now appear as'CRTS Action Items 24 through 27 respectively. The August Report added Item 28. The September / October Report adds Items 29 and 30.
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, Enclosure To GCA 87-780-Identified problems are listed in the CRTS Action Item List
[ Attachment (1)], 'the CRTS ODR List [ Attachment (2)], and the CRTS j NCR List [ Attachment (3)], with appropriate references. The separate 1 3
, ODR and NCR lists have been expanded and now provide descriptions of the occurrences or nonconformances, direct causes, corrective actions
,i ' ' and reference to the'CRTS Action Item Commentaries (Attachment'(4)],
where appropriate.
2.2 INITIAL ACTIONS Initial. action taken by SMUD was to initiate enhancement of the CRTS-program in mid-1986 and to use the enhanced program to check for 'j raceway overfills, violations of separation criteria, intermixing of ,
instrument cables with power and control cable, and other ,
discrepancies as listed in the Action plan. Although a number of discrepancies were " bookkeeping" problems, generated by the ,
enhancement, a significant number could, potentially, have been of ]
real concern. Identified discrepancies are documented in reports l from the SMUD contractor-[IMPELL] to SMUD and their dispositions.
described in Item 2 of the CRTS Action Item List and supported by ;
calculations in SMUD files. Late in 1986 a decision was made to !
signal-trace-a significant sample of the approximately.2400 safety cables installed from 1975 through 1986 and compare the "as-built" condition with plant documents and-the CRTS data base to establish a level of confidence in the reliability of the data. base. The signal tracing has found sufficient number of major defects in both Lot 1 (397 cables) and Lot 4 (78 cables) to require 100% inspection of each lot. -In late June, 1987 sampling was complete in Lots 2, 3 and 4.
However, in July, 1987 a decision was made to sample Lot 2 to the "one-defect" level, increasing the size of Lot 2 by 35 cables.
Circuit tracing was completed on October 26, 1987 with a total of 617 cables either traced visually or by signal tracing. Simply stated, the intent was to establish 95 percent confidence that the true l percentage of discrepant circuits [ major defects] in the sampled !
population is no greater than 5 percent. Inspection totals are in !
fact higher for Lots 2 and 3 than are required to establish this )
confidence level. See commentary to CRTS Action Item 28. l l 2.3 ACTION PLAN 4
SMUD has provided a document [ Appendix (2)] to the NRC which )
describes a five part Action Plan to consolidate the various j activities of the Nuclear Engineering Department, which deal with the J cable and raceway questions.
Although the scope of the plan is complete, the details and the l individual actions require additional definition to enable a reviewer .I to easily determine the acceptability of the resolution of each item I (i.e., question or issue raised). The Wire and Cabic Program Report <
is intended to replace the Action plan and to provide additional !
definition and schedule information on a monthly basis.
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Enclosure To GCA' 87-780L
'a o : WIRE AND CABLE PROGRAM REPORT
'(Continued) 2.4 CRTS ACTION ITEM LIST AND COMMENTARY ,
This report'provides a listing of thirty CRTS action items
~[ Attachment'(1)] with a detailed commentary on each [ Attachment (4)]. . : Diis list is intended to serve as a record of all questions raised and of all known problems, other than ODRs and NCRs. . For each item the list includesi an item number, description, source, status and'achedule for resolution, if appropriate.
A commentary will be provided on.each item covering chronology,
. generic implications,'causes and corrective actions as appropriate.
The ' September / October' report.contains all commentaries and final inspection totals [see the commentary to CRTS Action Item.28]..
To understand'the significance o'f each item it is necessary to read.the attendant commentary. The major concerns are summarized in Section 3.-
2.5 CRTS RETATED ODRS AND NCRS
- CRTS related ODRs and NCRs are now; listed separately [ Attachments . 2 and 3].with descriptions,~ causes, corrective actions and reference to the CRTS Action Item Commentaries, where appropriate.
- 3. MAJOR CONCERNS' ISSUES CONCERNS Procedures The'1evel of control exercised.on cable installation.
Sampling Plan. Accuracy of CRTS data on cable locations.
Data Base Completeness Omission of cables from data base.
Raceway Fill Control of cable tray fill [ weight and ampacity questions).
Design Control Mixing of instrument cables [with power &
control]: in design process.
CRTS Discrepancies Control and entry of data into CRTS.
Records Control of documents of record.
Miscellaneous Problems Completeness of licensee action in resolving j problems. ;
l Root Causes Identification and correction of all j identified root causes.
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, q u ;g Enclosure
-To GCA 87-780' -
WIRE AND CABLE' PROGRAM REPORTL (Continued) 'l Status of each issue is,.in summary, as follows:
3.1 LPROCEDURES Procedures in place during the original construction period are-addressed'in Item 7 of the CRTS Action Item List. Procedures in 1 place from 1975 throu'gh 1986 are addressed in the commentary to CRTS Action Item 25.
3.2 SAMPLING PLAN - .
This issue is fully addressed in the. commentary to Item 1 of the CRTS Action Item List.
- 3. 3 DATA BASE COMPLETENESS The " completeness"' issue of the CRTS data,-centers on the data concerning the telephone and security: cables. This issue,-although real,'has no significant safety implications. The issue also includes questions concerning the verification of CRTS software.
Items 10,11,12,13 and 14 of the CRTS Action Item List cover the completeness issue.
3.4 RACEWAY FILL i 1
The cable tray fill and weight questions have been reviewed. . 1 Percentage fill and weights for all cable trays have been checked.
Although some relatively minor questions remain to be answered, no significant problems have been found. Changes are planned to USAR which will reconcile-differences between the USAR and Nuclear Engineering Procedures and will clarify design' limits. Enhancements ;
planned to the CRTS software'will, when in. place, automatically j
-prevent fill'and weight limits from being exceeded. l These questions are addressed in Items 2 [ partial], 6 and ODR 86-125.
3.5 DESIGN CONTROL- 1 The design control issue is more complex than the raceway fill issue, but problems are limited to a relatively small number of instrument j cables which mix with power and control cables and violate design j" criteria. No evidence has been found of a programmatic failure following a review of the original 14,000 cable population. Checking of the 9000 cables added after commercial operation continues, but is not' expected to change this current evaluation.
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Enclosure To GCA 87-780~
WIRE AND CABLE PROGRAM REPORT (Continued)
The question of a'possi' ale generic design problem in the original 14,000 cable population is addressed in Item 5 of the CRTS Action Item List. Other specific mir questions are addressed in Items 2
[ partial], 9 and by ODR 87-307 and NCRs S-6523, S-6561, S-6562, S-6563, S-6564,'S-6565 and S-6566.
3.6 CRTS DISCREPANCIES The large number of CRTS discrepancies, listed by the SMUD contractor (Impe11] in Task 271, is another complex question.- Although the large number is initially disquieting, upon examination none have any safety significance as detailed in the commentary on CRTS Action' Item
- 2. One example of this is the total' of 763 reported mixes of Class 1 with Class 2 or 3 cables. Almost all the 763 cables are in the original. cable population which permitted mixing and none' violated safety criteria. All of the 1967 Class 1 discrepancies and some Class 2/3 discrepancies have been carefully' analyzed, with documentation, without finding any significant concerns. The reason for this, detailed in the commentary, is that the CRTS enhancements themselves generated the discrepancy lists which then had to be addressed. One' benefit of the CRTS discrepancy process is that the total population of.23,000 cables and related raceways has been scrutinized closely and resulta provide additional confidence in the-lack of significant safety concerns in the cable population. This issue is addressed in Item 2 of the CRTS Action Item List.
3.7' RECORDS Record control at Rancho Seco'is a simpler issue. The customary industry documents of record for installed cable and raceway are the signed installation cards. The computer tracking system-is used as a-convenient source of data while the verification record is'the installation card. At Rancho Seco the originals of the installation cards for the initial 14,000 cables and 13,000 raceways have not yet been found, although facsimile record copies do exist. As discussed in the commentary to CRTS Action Item 3, we find that records for the original cables and raceways are apparently complete, although the .
clerical task of checking each cable and raceway card _is not I complete. Card records for the cables and raceways installed after commercial operation are mostly complete. A search is being made for missing pull cards, of which 174 are safety related.
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D f Enclo:ura i To GCA 87-780'
! WIRE AND CABLE PROGRAM REPORT.
(Continued). >
1 3.8 MISCELLANEOUS; PROBLEMS,
'" ~ This issue' deals with the completeness of SMUD actions in identifying and .
resolving all cable and raceway problems. Together, the CRTS Action Item j List-[ Attachment,(1)],.CRTSLODRLList [ Attachment.(2)],.CRTS NCR List
~
[ Attachments (3)]*and the,CRTS Action Item Commentary [
Attachment:
(4)] is the vehicle.which records all questions and problems. .All items with safety significance will.be resolved before restart. -All items with no
, safety significance will be resolved before the end of the Cycle 8 outage. :
k' All Items in the'CRTS Action Item List will be reviewed for generic l
implications before resolution. When a concern has been identified, the.
basic steps taken by SMUD are:
- 1) Take immediate action to prevent repetition.
- 2) Identify the direct cause and take corrective action.
3). Investigate and identify the root cause, and if required, supplement the
. corrective action.-
3.9 ROOT CAUSES.
1 Where- applicable, root causes have been established for each item in the CRTS Action Item List. The Incident Investigation / Reviews Group [IIRG]
established root.causes for significant issues identified during'the investigation of problems encountered in the 9,000 cables installed 1975 through 1986. This issue is addressed in Item 15 of the.CRTS Action Item List.
- 4. APPENDICES
- 1. Sampling Plan for Cable Raceway Tracking System Database (Impell Task 271, SMUD calculation No. Z-ZZZ-E0694, Revision 3, Dated March 17, 1987).
- 2. Rancho Seco Wire and Cable Program Description and Action Plan (District Submittal Dated April 3, 1987 JEW 87-478).
- 3. Justification for the Exclusion of the Original Rancho Seco Cable
, Population from the CRTS Sampling Program (District Submittal dated July 24, 1987 GCA 87-338).
4 Prior Use of 95/95 Acceptance Criteria in Nuclear Power Plant Sampling Applications Involving Safety-Class Components and Technical Basis for Rancho Seco Sampling Plan (included in District submittal dated August 18, p 1987, GCA 87-400).
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a Enclosure To.GCA 87-780 WIRE AND CABLE PROGR M REPORT (Continued)
- 5. . Cable Discrepancies / Root Cause Investigations of the Cable Issues (District Submittal' dated. November'9, 1987)..
- 6. . Construction Inspection Data Reports.EC-13, dated October 16,.1978-and EC-48, Rev. 1,. dated February 22, 1980.
- 5. ATTACHMENTS
'l. CRTS Action Item List (4 pages) 2.'.~CRTS ODR. List (4 pages)
, 3. .CRTS.NCR,Idst (7 pages) j
'4. CRTS Action Item Commentary (134 pages) J l
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e h4 q 'Enclocure
' ' q To CCA 87-780 a .*-~
! Attachment 4 Page 1 CRTS ACTION ITEM COMMENTARY ITEM NO. 1 DESCRIPTION Demonstrate'that the CRTS recorded cable locations match t"as-built."
+ COMMENTARY CHRONOLOGY Employee allegations and statements as early as 1983 indicated possible
' deficiencies in the CRTS data with the possibility of both missing and inaccurate information. SMUD Nuclear Engineering. Department [NED) actions were pulled toge'cher into a single Action Plan in January, 1987.
SHUD IIRG assumed responsibility for the root cause analysis of the CRTS problems and related LERs in April 1987. 4 In July 1986, NED authorized a contractor [Impe11] to institute a review and evaluation of the CRTS program which would identify all data Discrepancies, evaluate and document their significance,_and report to SMUD. Approximately 43,000 manhours have been expended on this effort'to dateand
, work is still continuing. Completion of this effort'is Item 2 of'the CRTS Action Item List.
In early December 1986, NED made a decision to signal trace a sample of safety-related cables installed from 1975 through 1986. This program is detsiled-in the Sample Plan [ Appendix (1)]. The plan is designed to statistically insure that the overall quality level achieves at least a 95% compliance with a 95% confidence level. A decision was also made not
~to signal trace a sample of the original 14,000 cables on the basis that the original designer / constructor Bechtel Power Corporation [BPC) had exercised an acceptable level of control. The supporting rationale for this decision is1 referenced in Item 7.
By late June 1987' the finding of ten major defects in Lot 1 initiated a complete inspection of all 397 cables. 'able tracing was completed on October- 26, 1987 with 152. completely checked and 245 inspected in the rerouted portions. Two additional major defects were identified as described in NCR S-6884, bringing the total number of Lot 1 defects to twelve. Sampling of Lots 2, 3 and 4 is complete. Appendix 1 [SMUD Calculation Z-ZZZ-E0694] is being revised to remove deleted cables and also to remove 79 pre-1975 vintage Appendix "R" cables from Lot 2. The revised [and final) totals for inspection are given in the commentary to CRTS Action Item 28. c
- . ~ . - - - . - . _ _ _ _ _ - - - - - -
EncloIura J To GCA 87-780' Attachment 4-Page 2 L . ' ITEM NO. 1. CONTINUED , Population Lot 4 consists of a group of 78 cables which were all signal j traced. This was done because the signal' tracing uncovered 'seven Appendix
^
"R" cables which were documented as rerouted from Fire Area 36 to Fire
' Area- 31, when this had not been done, as der;cribed in LER 87-13.
I These cables' were part of the group of 28. cables installed under one ECN. This group includes the. seven cables found with incorrect routes in LER 86-10. All cables in this group [28] have now been ' traced with the fourteen cablesLdescribed having incorrectly recorded routes. The direct-and root causes of LER 86-10 and 87-13 will.be' addressed by the SMUD IIRG. See the Item 4 commentary for . the schedule. GENERIC IMPLICATIONS With the completion of the. Sampling Plan activity, SMUD has established a , 95% confidence that the CRTS database is 95% accurate with respect. to the location of the 2034 safe shutdown / safety-related cables installed from. 1975 through 1986. This is viewed by SMUD as acceptable and . comparable with industry norms as described in.the commentary to CRTS Action Item 28. The SMUD evaluation of the level of control exercised in installing the original 14,000' cables indicates a level of confidenc.e at least equal to the 95/95 target for the 9000. See Item 7 of the CRTS Action Item List. New procedures and planned CRTS enhancements'will be adequate to control the validity..of CRTS "as-built" data. The " completeness" 1asue concerning CRTS data is a separa'.e question and is addressed in Items 10, 11, 12, 13 and 14 of the CRTS Action' Item List. CAUSES. The' root cause of the problems related to the CRTS and its use is that
.neither Nuclear Engineering management nor the CRTS Supervisor were adequately involved in the CRTS. Root Cause evaluations are referenced in the commentary to CRTS Action Item 4. Corrective actions are described in the commentary to CRTS Action Item 29 and are reviewed against Root Causes in the commentary to CRTS Action Item 30. From the sampling plan results the "as-built" record appears adequate.
- 7 if.
Enclo;urs To'GCA 87-780
- (
Attachment 4 Page 3 ITEM NO. 1 CONTINUED CORRECTIVE ACTIONS The current: process mandates that the installation of safety cables [ Class ? 1.and Appendixl"R"] is witnessed by the QC inspector; this corrects a-major / deficiency in past practice. A'new procedure,. NEAP 4127." Cable and Raceway. Tracking System" was issued in June,,1987 and controls the methods 1 by which changes are made to the:CRTS databaseland the issuance:and. processing of:all-installation cards. Corrective ^ actions c have been-reviewed against the IIRG. root cause evaluations [See the commentary to' CRTS Action Item 30]. - 1 4
.Enclorurs-
- j. To GCA 87-780 Attachment- 4 Page 4-ITEM NO. 2 DESCRIPTION Resolve all CRTS database discrepancies.
COMMENTARY-CHRONOLOGY. Since?J uly 1986, a SMUD contractor [Impell] has been performing a review and evaluation of the'CRTS data for the total population of 23,000 cables. -This review has:been conducted'under control of the Impell QA Program and all results have been documented and submitted to SMUD for acceptance. Progress reports have been issued, the most nurrent of which is Report No.- 24 dated September 14, 1987. The large number of discrepancies reported are not a cause for concern.. Many are not real discrepancies, but are
" bookkeeping" corrections. .Still others are caused by incorrectly applying current criteria to cables which were installed to older criteria. These." discrepancies" are therefore. incorrectly reported, and no discrepancy actually exists.
As explained in the Action Plan, SMUD will review, evaluate and disposition, with documentation, all Class 1 and Appendix "R" discrepancies prior to restart. Class 2 and Class 3 discrepeucies will be dispositioned in the same manner after restart, but before the end of the Cycle 8 outage. GENERIC IMPLICATIONS Each discrepancy has to be evaluated separately. The evaluations may be summarized as follows. -Note that the Action Plan totals have, in some cases, changed as indicated: Class 1, Item 1.0 - Intermixing of Class 1/2/3 Cables (Total 763) None of the 763 discrepancies are ralid. The total breaks down-as follows: 669 Are part 6f the 14,000 original cables and are correctly installed. This is because the original criteria allowed mixing, provided that no Class 2/3 cables " bridged" redundant Class 1 separation groups. I 82 Are either deleted or are routed in "special" raceways so that J no mixing occurs. 12 Were installed post-1975 but under the original plant criteria. All may be grouped with the 669. l 1 I
m-- _ _ l Enclosure,.. i To-GCA 87-780 i. n Attachment '4 j Page-5 1, ITEM NO. 2 - CONTINUED Class 1-Item 2.0 - Overfilled Trays (Power and Control)' Total 38 The-38-cable. trays were reviewed to determine their. fill at the time of commercial operation"and their current' fill, with theLresults given below. g The 38 were checked for both ampacity derating and also;for weight.- ' EE-553 CRTS- EE-553 CRTS 10/14/75' 3/9/87 10/14/75 ,3/9/87 i Tray- % Fill -% Fill . Tray % Fill' '% Fill' L43AZ3 44 42 M41F1 36 40 L44AK1 45 49 M41G1 34 38-L44AU1 41 42 M41H4 36 41
'L44BF1 36 38 M41M3 42 44 L44BM2 17 40 M41P1 34 38 L44BN2 34 43 M41X1 39. 40 L44BY3 47 .49 M41Y1 39 40:
L44CF1' 45 51' M41Z1' 31 40 L44P1 39- 13 9 M43V10 47 40 L44P2 39 40 M43V11 34 37
'L44V36 49 47 M44AU1- 39 38 M39BA7 40' 42 M44AY1 34 39-
.M40AM2 36 42- M44AY4 49 53 M40AQ2 '37 42 M44V10 61 59 M41AA1 30 35 M44V11 36 43 .,
M41AD1. .34 39 -M44V70- 38 41 M41AE1 32 36 M45B1 48 45 M41AF1 32 36 M45V10 38 41 M41BD1 35 35 .M45V8 48 42-An;issuefraised by the Resident NRC Inspector concerned the documentation
~
of ampacity and weight checks. The specific question was, "Did SMUD perform 10CFR50.59 reviews of overfilled trays?" The review process for the original 14,000 cables and the later 9,000 added cables was as follows: Original Installation - Power and control cable trays filled in excess of 40% were che
- to verify that the cable loading was not in excess of 50 lbs/ linear ioot.
Instrumentation' cable trays filled in excess of 60% were checked to verify that the~ cable loading was not in excess of 50 lbs/ linear foot. Instrumentation cable tray fill between 40% and 60% was accepted based unon a generic calculation. In addition, ampacity checks were made on all power and control cable trays filled in excess of 40%. No documentation of the design checking has been found in Bechtel or SMUD files. Retention of such documentation was not a common practice. As detailed later in this commentary, all fills and weights have now been checked and documented. f.. l I' i E_ __:-._- _ _ . >
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Attachment 4- 4 1 Page 6 ITEM'NO. 2-
. CONTINUED Cables Installed After Commercial Operation
' Power and control cable trays filled in excess of 40% were dispositioned-as' described for the original installation, the cable loading was verified to be uless- than 50.lbs/ linear, foot, and the ampacity was checked. The
.results were not documented.by calculation, and no formal rev!ews were performed'to: verify that weight limits were met. Instrumentation' cable trays filled in excess of:50% were checked to verify that the cable
' loading was not'in excess of.50 lbs/ linear foot. Instrumentation cable tray fill between 40% and150% was accepted based 'upon a generic t
calculation. The results of the instrumentation cable tray weight checks-were also not documented, and no. formal 50.59 reviews were performed. Results lBy July 1, 1987, all cable' trays and conduits had'been reviewed for fill-and for. weight problems. Percent. fill is a feature of the CRTS program. Weight calculations were performed by a separate program run on a PC using data " dumped" from the main computer. Results are as follows: Instrument Tray Fill _s The USAR limit is 40% versus the Nuclear Engineering design criteria.which 9- has'a 50%. fill limit for instrument cable trays. >All trays have been checked for weight, regardless of fill level. No trays were found to exceed the USAR limit of 50 lbs/ linear foot. Visual checks are being Eperformed for " heaped" or " mounded" conditions indicating possible problems during a design basis earthquake. At this time, no significant problems have been found. The USAR fill limit will be changed, [see CRTS Action > Item 17]. Fower and Control Tray Fills The USAR limit is 40%. All trays have been checked for weight, regardless of fill level. One Class 2 cable tray is overweight by 1.16 lbs, assuming that the cables in the tray run the entire length of the tray. However, because cables enter and leave the cable tray along the length of the tray, in no case is the cable tray support loading in excess of 150lbs/ linear foot. In order to resolve the apparent overweight and to allow future cable additions to the tray without having to revise
. calculations. justifying the adequacy of the cable tray, the cable tray will be made'into two cable trays by ECN R-2015, issued on October'2, 1987. No other trays have been found with "real" fills in excess of 50 lbs/ linear foot. A few additional " false" fills have been found, which are in the process of correction. " False" fills occur when long tray sections include all cables in the weight calculations and exceed 50 lbs/ linear foot, even if some of the cables only run a short distance in
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- :the raceway'section, whereas the weight borne.between supportsLdoes not.
," cerceed50 lbs/ linear foot. Documentation..is-provided byfImpell.under Tasks 334L; Ampacity. checks have been made on.a112 power and control cablettrays g ,
, z with fills inl excess of 40%. 'No ampacity problems have been found.: I a ,
4 ; Summary'o'f Overfilled Tray Review m
.Nof significant problems have been found to date'.- Final. checks are f, l required to check special conditions to verify that their impact.is.
minimain 2 t <
- - Weight contribution from telephone / security.cibles. "
Weight contributions from fire wrapping ~and cablef tray: covers.
,y Prior to restartj all trays:will again be checked for weight,;regardless' W . .
of fill level. 1 Causes of'Overf111ed Trays ( No'significant problec have been found,7and there appears to have been a reasonable degree of-conservatism in the original design. .Nevertheless,.
, the lack of documented reviews in'the period.1976 to 1986 is.an omission
'in the-design process which should not have occurred.- The direct cause
~
f* wasia lack of procedural guidance. Enhancements planned for,the CRTS ;,
conduit is larger.than recorded,'or'are acceptable for other reasons (very short' length).- Quite obviously, conduitsLeannot'essily be overfilled',
;unlike trays, and 'all 108 have documented dispositions indicating a lw e >
complete lack of either-fill or.ampacity problems. . i. ! ,, Class 1, Item 4.0 - Overfilsed conduits (Instruments) (Total is 14,'Was 13)
- -[ -
g .y4 are dispositioned as false fills or similar. No ampacity problems
' exist with instrument cables.
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Attachment 4 Page 8 ITEM'NO. 2 CONTINUED Class'1;~ltem 5.0 - Raceway Connections'(Total is 293, Was 200)' The CRTS program established " linkages" or." nodes"~to check that connecting ~ raceways'in ' cable vias did, in' fact, connect. 'When nodes were missed by designers' making the drawing changes, each missed node generated-a' discrepancy. report for each cable using'the via. .A11' missing nodes'have 3"
.been checked and the " bookkeeping" errors corrected.
a Class 1, ' Item 6;0 - Duplicated Numbers (Total' is 2~, Was 35) These .are' two . " boo'kkeeping" errors, both of which have been dispositioned ' as having no significance.
' Class 1, Item 7.0 - Document Discrepancies (Total'is 555, Was $51)
The 555 are a miscellanysof minor: data discrepancies dealing with entries covering equipment numbers,' raceway numbers, cable codes, cable data (conductor size / number) and others, All have.been, checked and the data corrected as needed. No data questions remain open, j Class 1, Item 8.0 - Tagging / Identification Discrepancy-(Total is 0,-Was 7) The original seven items.are now reported in the Item 5.0 totals. Claas 1,. Item 9.0 - Missing / Unsigned Construction Cards (Total is 174, Was. 53) The 174 cards all exist but are missing signatures. Three NCR's have been issued covering all 174.- Dispositioning will require verification of terminations or cable / conduit locations, whichever is appropriate. Termination and cable verifications, about 60, are complete. Conduit data F will be verified prior to restart. The following Non-Class 1 discrepancies have all been dispositioned without finding any safety problems. Non-Class 1, Item 1.0 - Intermixing of Power / Control / Instrument Cables (Total is 400; Was 125) lThe USAR wording requires separation of instrument cables from power and control cables'for RPS and ESFAS. USAR does not cicarly address mixing , [ g,' for other systems and does not address or define what constitutes instrument, control, and power cables, i' l 1 L_ -
7-- 1 Enclosure To GCA 87-780' ( Attachment 4 Page 9 r' ITEM NO. 2 L - CORTINUED L SMUD Nuclear Engineering Procedures (NEP's,-Criteria and Guides).also.did not clearly define instrument, control, and power cables. However, various types:of signals (analog, digital) were discussed, and digital signal cables permitted to mix with control cables. The NEP's have been're'ised v to define the separation required between instrument:and power and/or control cables and to define the instrument circuits requiring separation. Details are given in the commentary in CRTS Action Item' 9. The'400 reported Non-Class 1 mixes have been dispositioned as.follows:
-367 _ Accepted as meeting,NEP's.
16 To be rerouted.
'17 Which require drawing changes to clarify. service level.
400 Total The original design process used twisted shielded pair (TSP) or coax /triax
~
cables for all circuits considered as instrumentation. This has led to some confusion, since no cable service levels are established in CRTS. A future CRTS enhancement will identify service levels for all cables. Non-Class 1, Item 2.0 - Overfilled Trays (Power and Control) (Total .is 153, Was 131) All trays have been checked for weight.- Only one tray exceeded the 50 lbs/ linear foot USAR limit, as discussed previously. Ampacity checks have been made on all cable trays with fills over 40%.. No ampacity problems have been found. Non-Class 1, Item 3.0 - Overfilled Trays (Instrument) (Total is 18, Was 19) All trays have been checked for weight. None exceed the 50 lbs/ linear foot USAR limit. Non-Class 1, Item 4.0 - Overfilled Conduit (Power and Control) (Total is 644, Was 639)
.All 644 are either incorrectly recorded, because the "as-built" conduit is larger than recorded in CRTS, or are acceptable for other reasons. No ampacity problems exist.
Resolution of Minor CRTS Data Discrepancies A number of minor Non-Class 1 data discrepancies exist as reported in Impell Status Report 9, dated January 12, 1987. These are summarized below. None have any safety significance. These data discrepancies will be resolved after restart but not later than the Cycle 8 scheduled outage.
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To CCA 87-780
- c. u; Attachment 4 Page 10-i.,. ITEM NO. 2 CONIINUED-3
'Non-Class 11
'110 ;0verfilled Conduits (Instrument / Telephone) 15'l-2.0. RacewayjConnections 1390 H3.0) Duplicated Numbers 33
, 4.0f Document Discrepancy 1594 7 ^5.0I . Tagging / Identification Discrepancy 130.
15 ; 0 Missing / Unsigned Construction Cards 92 Subtotal 3390 Security 7.0 Raceway Connections 177 J8.0 Duplicated Numbers. 29 19.0;; Documentation Discrepancy. 276 10.0' Tagging / Identification Discrepancy 4 11.'O Missing / Unsigned Construction Cards 88 Total 3964 Causes of Discrepancies The enhancement of the CRTS software generated the' list of discrepancies. The direct cause of the discrepancies was the database conversion and
- errors entered into the database in the 1980 to 1982 timeframe..
The root.cause of the CRTS problems will be determined by the IIRG. Both ; the design and installation processes will have to be examined to find out '
-how data-errors came to exist in such'large numbers. The level'of control exercised is addressed in Item 4 of the CRTS Action Item List.
1 CORRECTIVE . ACTIONS q Major [ safety-related] discrepancies will be reviewed and dispositioned,
. with documentation, prior to restart. Minor (non-safety-related]
discrepancies will be reviewed and dispositioned, with documentation, prior to the end of the Cycle 8 outage. Disposition of each discrepancy- .q will. include verification that plant design documents, the CRTS database j and the "as-built" plant configuration are all in agreement. .] i 1 m i _ _ _ _ _ _ _ _ . . . _ . . _ _ __._._______._.____.__..____O
p , T= N> ' er > Enclosurs To GCA 87-780 Attachment 4 Page 11 ITEM NO. 3 DESCRIPTION Define'SMUD' document of record' controlling cable location.
. COMMENTARY
, CHRONOLOGY In a January 7, 1987 meeting, the Region V Electrical. Inspector [Mr. Andy Hon] asked where cable pull cards are now kept and what will be done with-cable pull cards in the: future. To answer the question concerning SMUD
' future actions required defining the SMUD document of record for cable locations. Answers to the two original questions and the additional
' definitions are as follows:
i 1.- NRC Question: Where are cable pull cards now kept [ January, 1987]? District Response: 'The cable pull cards, together with equipment and
' raceway installation cards, were kept in either locked metal card files in an office area ei the "Bechtell Building," which'is a temporary on site construction office, or in boxes in trailers used.
as. temporary offices.
- 2. NRC Question: What will be done with cable pull cards in the future [After January, 1987]?
District Response: The cable and raceway installation cards are now being kept in a " vault" in the "Bechtel Building." The' record documents are a mixture of original cards and facsimiles when the originals cannot be found. The vault is a secure, locked room with cement walls and a Halon fire protection system. At this time, records are being checked to see how many cards are missing. When original cards are not found, facsimiles from the construction records will be substituted to create a complete record. A duplicate record is being created on microfilm. As of October 31, 1987 approximately 27,000 cards have been microfilmed and returned to the Bechtel Building vault. This process will f continue until a complete duplicate record is [ established. i L
Enclosure oi. To GCA 87-780 Attachment 4 Page 12 ITEM NO. 3
' CONTINUED
[ Additional Information
-1. INSTALLATION VERIFICATION RECORDS FOR INSTALLED' CABLE AND RACEWAY The-Installation Verification Records for installed cable and raceway Lare the " pull' cards" and " raceway installation" cards',respectively.
-AsLof October. 31, 1987;.174 Class 1 cable pull cards.(originals or facsimiles).have not yet been located. Full details of all missing cards (all types) are'given in Section,4'of.this commentary.
- 2. ENGINEERING RECORDS FOR DESIGNED CABLE AND RACEWAY' These' records are the input documents to the CRTS program. .They are designated as " forms" and are engineering drawings by SMUD definition.
Origina11y', new forms were' issued for changes. .As of June 15, 1987, all'new cable and raceway input documents have been handled as-Drawing Change Not' ices. Originals of input documents are being marked to show changes instead of issuing new forms. [ Reference memo EEGS 87-005, from'E. J. Gough to the Electrical Engineering staff, dated May 1, 1987] CRTS input drawings / forms are as follows: E-1008 Raceway Input Document E-1010 Scheme Cable. Input Document E-1026 Raceway Code Input Document E-1027 Cable Code Input Document E-1028 Electrical Equipment Input Document
- 3. CRTS PROGRAM AND DATA BASE The function of the CRTS program and database is twofold:
- a. An engineering design tool which is used by the design group to perform design checks and calculations. Currently, the CRTS program checks for: l
- Raceway continuity
- Percentage fill
- Mixing of redundant separation channels
- Verifies raceway service levels for compatibility l
The CRTS is being enhanced to perform: L
- Weight calculations l l-
- Checks on mixing of instrument cables with power and control cables L - ---- -- _ __ .-__ _ _
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, Page 13 g
yl, f ITEM NO. 3 CONTINUED
'bi A convenient data source which is used for engineering-design'
. information Typical uses of the CRTS generated information are:
- Identification of' cable routes
*. Calculation of. totals of' combustible materials (Btu totals)
* . Weight calculations for cable' tray sections GENERIC IMPLICATIONS Plant cables provide many diverse functions; The cables of safety systems
. provide both power supply and control functions, as well as important indications to operators. .The control and separation of redundant safety groups of cables and of all cables! required for safe shutdown are important safety factors. The existence of reliable and accurate records concerning the location of the~ cables is~ essential to plant safety.
.With the completion of the Action Plan, SMUD will have established a record file of installation cards (originals and facsimiles) and a duplicate. microfilm record. SMUD will also:have confirmed that the CRTS database is accurate to an acceptable confidence level.
With adequate maintenance of both records and CRTS data, the.necessary level of control will' exist. CAUSES Difficulties in tracing records indicate a need for greater management interest in record storage and an increased awareness on the part of SMUD employees of the importance of records. CORRECTIVE ACTIONS Replacement Cards: The detailed procedure for the replacement of missing CRTS' cards will be provided in Revision 1 to NEAP 4127, with a forecast issue date of November 30, 1987. Current Process: A new procedure (NEAP 4127) was issued in June, 1987. This procedure is considered adequate to ensure that all cards are returned to CRTS. 4 TOTAL' NUMBERS OF MISSING CARDS The following are details of all missing cards as of October 31, 1987: i l l L l
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< To GCA 87-780?
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.-Attachment' 4 Page 144
. ITEM No. 3
- 1. .
;C0fGINUED
-Cable Rac,eway Tracking System (CRTS) ,
.O!ALYSIS OF 2,466 MISSING CABLE CONSTRUCTION CARDS' 0ctober131, 1987 1 ,
Nuclear (1) Nuclear (2). 'Both(3) . ~(4) Operation. Engineering .Depts. . Pre-ECN-Total Missing Cards 3 1158 - 47% 1083'- 45%- 51 -. 2%- 174 - 7%
' Pull Cards'- '177 - 7% ^252 - 10% 23 '1% 10 - 0,4%
'From' Termination Cards 475 - 19%: 238'- 10% 14'-0.5%. 18 - 1%.
S .'To'. Termination Cards 444 - 18% 283 - 12% 14 -0.5% 18 - 1%'
' Delete'. Cards 62 - 3% 310 - 13%. 0- 0% 128 - .5%
1
~ Total Cables in Data' Base (CRTS Revision Level 1608). 22,868 Total: Cables Having Missing Cards 1,456 Fraction.of Cables Having Missing Cards .6.37%
Total Missing ' Pull' Cards 462 - 19% *- Total Missing ' Termination' Cards 1504 - 60% Total Missing ' Delete' Cards- 500 - 21% Total'M'issing Cable Cards 2,466 - 100% (1) Nuclear Operations {NO] initiated ECN. j
.(2) Nuclear Engineering [NE] initiated ECN.
V (3) N0/NE jointly initiated ECN. (4) Proposed cables entered 1976-1980, no ECN.
- Missing Class 1 'Pu11' Cards 174 (7% of all missing cards) 1 i.
c_ _ _ _ _
n, - t i 4 ;f ff?' Enclosure To GCA:87-780. o Attachment 4 Page 15 s ITEM NO. 4 DESCRIPTION' Document'theilev'el of control exercised by SMUD in. cinstalling cable 1975-86. CHRONOLOGY Questions concerning the completeness of CRTS data, missing installation cards, and' conflicting procedures:have been raised beginning in 1983. .The existence:in'1978 of Quality Control Instruction QCI 107, which required o the' destruction of installation cards, raised _ questions concerning records. Employee allegations and statements'to the SMUD Ombudsman also tended to indicate some possible problems in controlling thel installation
-process. LLER 86-10 identified 7 Appendix'"R" cables which should have g..m been relocated but were not.
c
'The SMUD IIRG has completed their investigations' and forwarded.a summary of their Root.Cause Reports in DTS 87-103 dated Nov.'9, 1987.
.c CRTS ACTION- DESCRIPTION FORECAST ITEM 23 Determination of the enuse of the redundant Complete cabling in same fire area (LER 86-10) and the determination of the cause of redundant instrument cables routed through same fire area (LER'87-13).
25 Document a thorough engineering Complete evaluation of the procedures and specifications used to install cable in the period 1975-1986, 26 Description of the events and LER 85-16 Complete circumstances leading to the LER 86-10 Complete misrouting of cable described in ?FR 87-13 Complete LER's. LER 87-26 Complete 27 Description of the events and Complete circumstances leading to the discrepancies discovered between the "as-built" cable routes and the routes recorded in CRTS. E Refer. to Appendix 5 for a summary of the Root Cause investigations. l l-l o I
- r. .- ,
" Enclosure.
.To GCA 87-780 I' Attachment 4 Page 16 c ITEM NO. 5-DESCRIPTION Demonstrate that no Bechtel generic design problem existed.
, COMMENTARY CHRONOLOGY With the_ discovery of a misrouted RCS pressure transmitter instrument cable as.being.a possible cause of the August and December 1985 spurious closures of the Decay Heat System (DHS) valve HV-20002 (LER 85-16), and the further identification that the miscouting of the instrument circuit occurred during the original design of the plant,' investigation of the Loriginal cable population was begun for any evidence of a generic design j problea. i CENERIC IMPLICATIONS , i The original Rancho Seco cable population consisted of nearly 14,000 cables, routed in 13,000 raceways. The original Rancho Seco EE-553 circuit and raceway schedules were reviewed for'any evidence of a generic
-design problem in the original cable population. Since the present CRTS database has been reviewed for raceway fills and weights, channel separation and channel " bridging," and would have identified any such problems in the original cable population, only intermixing of power, control, and instrumentation cables was examined in the original cable population.
The EE-553 raceway schedules were reviewed for any indication of a generic problem concerning power / control / instrumentation intermixing. Approximately 3200'pages were manually reviewed, representing approximately 13,000 raceways. Approximately 10 cases of Class 1 intermixing were identified and approximately 60 cases of Non-Class 1 intermixing were identified (Table 1), with no evidence of a generic intermixing' problem. It should be noted that of the 10 Class 1 cable intermixes, that 8 no longer exist in the plant. The remaining 2 cables provide tachometer indication signals to local panels of the Bruce GM
. Diesels [ Reference Drawing E344 Sheets 1, 4 and 5] and have no safety features actuation or reactor protection function, j The Class 2 Appendix "R" cables listed in Table 1 have been reviewed. On the basis of this review, the Class 2 cables 1M2C3271, 1M2D228D and IM2D229D are the only - Appendix "R" circuits. These cables are routed in a four-foot-long, Non-Class 1 instrumentation tray X45V20 to test panel H3TP.
(- p4< L e F , Enclo;ura (- -To GCA 87-780-Attachment 4-Page 17 ITEM NO. 5 CONTINUED Instrument cables' included in.the tray are infrequently energized and carry a, low current which.cannot cause an adverse _effect on the adjacent control cables. Therefore, the above ' cables can remain as routed and no corrective action is required. The remaining Non-Class 1 cables will'be reviewed by the end of the Cycle 8 outage. CAUSES Both the FSAR and USAR require separate cable tray, conduit, and ' penetration systems for 600-volt power and control cables and for-instrumentation cables. The cable scheme numbering system used at Rancho j
- Seco' requires a "1" in the first location of the cable scheme number to
. designate Rancho.Seco Unit 1. A digit in-the second location of the cable scheme number designates a power cable; a letter in.the second location of the cable scheme number designates either a control cable or.an instrumentation' cable. Without a method to differentiate the scheme cable number of a control-cable from that of'an instrumentation cable, intermixing may have occurred.-
CORRECTIVE ACTION Upon the consolidation of SMUD efforts to resolve Rancho Seco wire and cable problems-(Action Plan, JEW-478, April 3, 1987), Bechtel was asked to review the 1975 cable'and raceway schedules for any evidence of a widespread problem concerning the intermixing of power, control, and instrumentation cables. The intermixing of instrumentation cables in - power and control raceways'was identified by examining the:1975 EE-553 raceway schedules for_any shielded _ cables in power and control raceways. In order to identify the power and control cables intermixed with instrumentation cables in instrumentation raceways, the 1975 EE-553 , raceway schedule was examined for non-shielded cables in instrumentation I raceways. The results are given in Table 1.
- In order to prevent any further occurrences of power, control, and instrumentation intermixing, SMUD has directed, by memo, that an additional column be added to the "1010" drawings and DCNs to indicate the 4 service level of the cable being added. For each added cable, the new )
column will indicate either "P", "C", or "I" for power, control or j instrumentation service, providing the physical designer with the _j necessary information to properly route newly added cable. [ Reference memo EEGS 87-006, from E. J. Gough to the Electrical Engineering staff, dated May 4, 1987.] Additional service level designators are under consideration and include "T" [ Telephone), "S" [ Security] and "IE" [ Instrumentation - Exempt - may mix with P and/or C cables). l u Quehwww._____ _
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. Table 1:
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.OriginalLCable Population Power / Control / Instrumentation' Intermixing; y, .:. ,
D t 4 f<> ,
ym .. W $ iClass'l Intermixing # 6 '
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pk : Pawer'. Cable"in Instrumentation Raceway 9 , ,
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- .;, , 'None!- ,
, ij JControl Cable' ink Instrumentation Ra'ceway' .
a 1 [ , , 1M1A131D *
':-G 5.1M1A131E *: 4 .-
} 1M1B139DL.* " .y
'.s . 1M1B139E *..
r ~ Instrumentation' Cable'in Power and Control Raceway-
, g 11GlQ886CS; '
J1GlQ886DS-H:
=1RIC260AA1.* '
, L1RIC260AB:*
i '!1RIC260BAE* W .1RIC260BB *- x Non-Class.1 Intermixing Power"Cableiin Inst.rurentation Raceway 112E07A- 112GS1GC
- 112SDPS6A *-
112E11D- 112GS1GF'
- 112SDPS1B *
, 112E11E 112GS1GG *- -112SDPS2B *> 112E09CN. 112J11EA
- 112SDPS3B
- 1112E09C0 112SDPSIA
- 112SDPS4B *
*, :'112E09DI *- 112SDPS2A
- 112SDPS5B
- i% '
112F15Z. 112SDPS3A *' '112SDPS6B
- c :112GS1GA1* 112SDPS4A
- 112D230B s 112GS1GB .'
- 112SDPS5A
- 113C109A O , '
- Cable deleted, no' longer installed in plant
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l.}l.!}: . q.:; , ,, T J Control Cable lih Instrumentation Raceway. 3 b N1A3A265D3) :112B360CA , 1M2C327I: 4 , , 3. . 112B360T ': 1M2D202B *'
'1A3B470A1 < 1 g.; , :.g' '1A3B470A2.
112B365CA- 1M2D224I: m;. ' y. '.1A3B470A4 112B365X- ^ ' 1M2D228D
' " .!1A3P20082; .112G996DE - 1M2D229D' C J
'1A3P200B6" ~1I2N150LF -1M2E203B
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' Instrumentation Cable 'in Power a'nd Control Raceway - '
o t L i L1I2G20N 112R301B, 1R21460BT H, .-1R2PBTPA'
- > L112G202- .1I2R520AB-r., , ,,,
112G203_ f.- II2R520AF ..1R2T250A' , 'l gi - .112G204L II2R520AJ- ,t , 112G417! 112R532AB r*. Cable' deleted,-no longer' installed in plant i, I l-i' [< j.
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'To GCA 87-780-Attachment 4 Page 20-ITEM NO. 6 DESCRIPTION-. Resolve overfill / overweight questions; including' USAR and 50.59.
COMMENTARY CHRONOLOGY In February 1986, ODR 86-125 was prepared as a result.of an investigation i following allegations of raceway overfilling. The ODR examined instrument {t cable-' tray overfilling, because~ instrument trays are filled to a higher level than power and control trays, and determined that for the cable tray .
- with the' highest fill, that the cable-loading did not -exceed 50 lbm/f t. l In addition, it was verified that the actual cable tray loading was used-
.in the fire hazard analysis and also that the cable tray heat derating was acceptable with respect to the cable ampacity. As a result of the above.
investigation, 38 Class 1 overfilled trays and 150 Non-Class 1 overfilled 1 trays were identified and subsequently reviewed for overweight, as described in the commentary to CRTS Action Item 2. ODR'87-204 was initiated in February 1987'as'a result of concerns that cable trays with fills less than 40% might, in certain unique q
' circumstances, exceed the cable loading of 50 lbm/ft. LER 87-24 was also (
' initiated to determine the deportability of the identified. problem.
d GENERIC IMPLICATIONS The Rancho Seco USAR' limits the fill of redundant. cable trays' to 40%, so ; as not to exceed the cable loading of 50 lbm/ft used in the cable tray I support design. Cable trays do exist whose fill exceeds 40% and were j dispositioned during the original design process. Power and control cable j trays filled in excess of 40% were checked to verify that the cable 1 loading was not in excess of 50 lbm/ft. In addition, an ampacity check l was performed. Instrumentation cable trays filled in excess of 60% were ! che'cked to verify that the cable loading was not in excess of 50 lbm/ft. Cable tray fill between 40% and 60% was accepted based upon a generic l calculation. Although the above calculations were performed during the { original design process, the calculations have not been found, j i 1 l I 1 l
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. Enclosure
'To GCA 87-780' l, or L
4 , Attachment 4 Page 21 ITEM NO. 6 CONTINUED-Power and control cable trays filled in excess of 40% after commercial operation were_dispositioned as described for the original installation. For instrumentation cable trays' filled in excess of 50%,'the cable' loading was verified not t'o exceed-50 lb/ft. .The results.of the weight chec'ks performed after commercial operation were.not documented, and no formal' 1 50.591 reviews were-performed. As of May 1987, all' cable trays _have;been-reviewed for fill and weight problems, with only one Class 2 power and icontrol' cable tray requiring physical modification as described in the
' commentary to CRTS Action Item 2.-
The USAR limit is 40% for' power.and control' tray fills. All. trays have been checked.for weight (regardless of fill level). Only one. tray has beenlfound with?an." apparent" fill in excess of.50 lbs/ linear foot requiring physical modification., " False" fills have been found'where a long1 tray section' includes all cables in the weight calculations-(and' exceed 50.1be;, whereas the weight borne between supports does not exceed 50 lbs. Ampacity checks have been made on all power and control cable trays;with fills in' excess of 40%. No ampacity. problems have been found.
~
xThe USAR" limit is 40% for instrument tray fills and is at variance with the Nuclear Engineering criteria which has a.50% fill limit for instrument cable trays. All trays have been checked for weight (regardless of fill level). No instrumentation trays were found to exceed the USAR limit of - 50 lbs/ linear foot. Vi'sual checks are being performed for " heaped" or
" mounded" conditions indicating possible problems during a' design basis .
earthquake. At'this time, no significant problems have been found. The USAR wording will'be revised, [see commentary to CRTS Action Item 17), and
)) '
the fill limits will be defined in the NEP's. In summary, no significant problems have been found to date. Final checks l on weight contributions from telephone / security cables.and weight .I contributions from fire wrapping are required to verify that their impact 18 minimal. l
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Enclosure:
I To GCAo87-780 0 Attachmtnt' 4-H , 1 . Page 22 ITEM NO. 6
, CONTINUED
-CAUSES-As evidenced by the discovery of. only one " apparent" problem concerning overfilled cable trays, .the' original 40% ' fil.1 limit was a very ,
conservative requirement in'the: original. plant design.- However .the absence of documented 50.59 reviews for those ':able trays whose fill. was exceeded (post-commercial operation] is a cause for concern. The direct cause of both' overfill and: overweight' conditions lacking the documentation ' validating theirl acceptability was a lack. of procedural guidance. CORRECTIVE ACTION Immediate corrective-act' ion has been to review all cable tray weights regardless of fill level [see. commentary on CRTS Action Item 2]. Additionally, forfnew design work [added cables],.all' power and control' trays which exceed 40% fill are checked for weight and ampacity; all instrument trays whose fill exceeds 50% fill are checked for weight. NEAP 4127 requires all DCNs which add cable and increase tray fills above 40% to be referred back to NED for review and documented analysis. In
-addition,.the.50.59 review concern will be resolved through the NCR.
process, with'a-forecast completion date of November 30, 1987. Issues to be resolved p'st-restart, o but before the end of the Cycle 8 outage are as follows:
*: ' Resol've the concern of security and communication cables [Clasa 2 and 3] on raceway fill and weight.
- Resolve the concern of firewrapped cables on raceway fill and weight.
- Resolve the concern of coiled cables, not connected to equipment, on raceway weight.
- Resolve the concern of cable tray covers on cable tray weight.
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- m 7, DESCRIPTION- .JusEificationJforLnot' sampling.the original cable population'.- !
~
ppr LCOMMENTARY
- CHRONOLOGY
,73 .7 ! $ 3l Y..As'a. result of(employee allegations as far'back1a's 1983,, and. with the June- 1
- 11986 identification of'seven misrouted Appendix "R"rcables; a: decision was'
~
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- made in December.1986 toisignal trace a sample of safety-related cables q g:MI u ' installed after commercial' operation in 1975. The orlginal' cable: 1 population ofi.14',000 cables was excludedifrom the sampling pl.anibecause 1
's ,
the: designD installation and: inspection of the1 original cable population.
'by1Bechtel PowerLCorporation,l Rancho SecotA & E and Constructor.was i j 7,
- governed by a quality program aufficient.to control'the. physical design '
4 '
' ' and installation of the' original cable population. ,
~
SUMMARY
4.. Justification for., excluding _the original. cable population was presented;by i SMUD during the June, 1987 NRC. inspection visit:in the form of~atreport.
~
l The' report,ftitled " Justification For Not. Sampling The Original Rancho *R Seco Cable Population,*: was formally transmitted .by GCA 87-338, dated 'Julyt
'24, 1987. The. report demonstrates that Bechtel had in place'and:used a rigorous quality. program sufficient to contro11the physical' design of the' ]
original cable population. In. contrast.to those cables installed-after ; commercial ~ operation,:the original l cable population was installed while the: plant wasiin'a construction mode,,under a uniformly consistent set'of >
- rules and procedures. The procedures did.not-vary during the design, i installation and inspection of.the original cable population, and it.will. l be.shown that these procedures were rigorously followed by a relatively
' < stable and.well-trained workforce. The justification for.not sampling the. .
4 . original cable. population was transmitted by GCA 87-338,. dated July 24, 1987, and is. Appendix 3 to the Wire and Cable Program Report. l lr I= ;
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-To GCA 87-780 p
Attachment 4 Page 24-
- r ITEM NO. 8' DESCRIPTION ' Resolve.all known physical probl~ ems.
I COMMENTARY: CHRONOLOGY Physical' prob 1' ems related to the Rancho Seco cable:and raceway installation have been identified by LERs ~85-16, 86-10, 87-13, 87-24 and
,87-26. In addition, Impell, under Task 271, has identified,-with i documentation submitted to SMUD, additional CRTS database discrepancies, although not all are physical problems (See commentary to CRTS. Action Item 2];' The identified physical problems are of the following types:
Overfilled / Overweight Cable Trays (LER 87-24) Refer to commentaries to CRTS Action Items 2 and 6 for discussion. Intermixing of Power / Control / Instrumentation Cables (LER 85-16 and 87-26) i Refer to commentaries to CRTS Action Items 2, 5 and 9 'for discussion.
' Lack of Configuration Control (LER 86-10 and 87-13)
Refer to commentaries to CRTS Action Items 1, 4 and 23 for discussion..
' Lack of Redundant' Class 1 Channel Separation No identified problems of this type have been found to date.
Lack of Class 1/Non-Class 1 Separation As described in the commentary to CRTS Action Item 2, none of the 763 intermixes of Class 1, 2, and 3 cables are valid discrepancies. The cables were either installed under the original piant criteria, which allowed mixing, or are deleted or routed in "special" raceways so that no mixing occurs. CAUSES Refer to commentary to CRTS Action Item 15. l
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41 _ _ . . _ _ .
g, - - 1 i t, ; rJ ' Enclorurs i- To'GCA 87-780 Attachment' 4
#' Page 25 ITEM NO. 8 CONTINUED CORRECTIVE ACTIONS
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Li The following corrective actions have beenftaken.to resolve known Rancho Seco cable and' raceway physical problems, and to prevent their recurrence: Overfilled / Overweight Cable Trays Immediate corrective action taken as a result-of ODR 86-125 and LER 87-24 was the review.of all. cable tray weights, regardless of' fill level.' As'a-result of the cable tray weight' review, one Class 2' power-and control cable tray'was found.to be overweight. ECN R-2015
'will be issued in October to divide the-tray into two trays to Lresolve the apparent overweight. Corrective action to prevent
- recurrence has been the revision of procedure NEAP 4127, " Cable Raceway Tracking System,"'to require that data contained in DCNs to
.CRTS-related drawings'be " error free" when input to the proposed CRTS database. Should an error report indicate an-overfill condition, then the DCN is. returned to the originator for.
resolution. In addition, the USAR will be revised to reconcile disc epancies in fill limits for instrumentation cable trays to be conListent with NEP 5204.22, [See - commentary to CRTS Action Item 17] . Intermixing of Power / Control / Instrumentation Cables Immediate corrective action taken as a result of the identification of an SFAS instrument cable routed through power and control raceways in LER 85-16 was' the review of the CRTS database for further intermi7ing [see commentary to.CRTS Action Items 2 and 9), as well as the examination of.the original cable population for a generic intermixing problem [see ccamentary to CRTS Action Item 5] . The intermixing identified by LER 85-16 has been corrected by ECNs R-0459 and R-1295. Further intermixing has been identified by CRTS database reviews, as identified in LER 87-26, and by cable signal 1 tracing as identified by ODRs 87-604 and 87-723 and are corrected by ECNs R-1785 and R-1786. Sixteen Non-Class 1 intermixes requiring relocation were identified by Impell as documented by CPRs CPR-0611, l 610, 885, 638, 640, 622,.642, and CONS CON-584 and 742 contained in f Idpell Calculation No. 271-101-109, Rev. O. Presently, Impell is resolving SMUD review comments, with a resolution date of November 30;/1987. Upon resolution corrective action will be taken. Corrective action to prevent recurrence of power / control / instrumentation cable intermixing has been the revision of Design Guides NEPM 5204.22, " Cable System Design, General," and NEPM 5204.43, " Instrumentation Systems Shielding and Grounding and Surge Protection," to clearly define the physical i 1
.__.__.-_.____________________._____._____o
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Enclorura To GCA'87-780
' Attachment ~4-1 Page 26 ITEM NO 8
~ CONTINUED separation requirements for' power, control, and instrumentation circuits and-to provide definitions of the cable service levels [See commentary to CRTS Action Item. 9] . . In addition, the US AR will' be
- revised to removeLany ambiguity.as to.the applicability of intermixing restrictions to RPS and SFAS in USAR section 8.2.2.11.H
[seeLcommentary to CRTS. Action 17]. Lack of Configuration Control Immediate corrective action taken,.as a result of the identification. of' the cable misroutes in LER 86-10, tras to initiate . the Rancho Seco cable sampling to establish a level of confidence. in' the cable installation. The LER 86-10. cable misroutes were corrected by ECN
'R-0765, which is construction complete. The additional cable misroutes identified during the cable- sampling activities' and documented'by LER 87-13 were rerouted by work request.
Corrective action taken to prevent the recurrence of cable misroutingt has been to . revise the Modification Procedure / Inspection Standard MP/IS-307, " Cable Installation," to require the use of design drawings of the latest-revision when installing cable,'and the requirement that the cable routing information on the E-1010 series drawing match that on the applicable cable installation card. Witnessing requirements for cable pulls have also been clarified in.MP/IS 307 to require that cable insta11atlon verification ~shall consist of witnessing the installation of the cable. Lack of Class-1/Non-Class 1 Separation
< No corrective. action necessary, as none of the 763 intermixes of Class 1, 2 and 3 cables are valid discrepancies.
l l L l L U _ _ _ - _ _ _ 1
y, ~ lij' rs Enclosure-To GCA 87-780 Attachment 4 Page 27 ITEM NO. 9 Description Resolve power / control / instrument cable mixing concerns.
'CommentaryL i
Chronology. LER 85-16 Rev.'0'was the first. documented evidence that instrument' cables had - been mixed with power and/or control cables at Rancho 'Seco.- Since this discovery,' additional' "mixin' g" has been found and details are - provided in' the commentaries to CRTS Action Items 2- [ partial) and 5. Generic 1 Implications l The concern is the avoidance of unacceptable noise levels-caused.by. d cross-coupling between adjacent conductors in instrument circuits. :The-level of noise is a concern.for analog circuits and some digital circuite. No' concern' attaches to cable; insulation levels since all power, control, and instrument cables have 600 volt insulation ratings and additional protection-ln the' form of a protective outer jacket. The ability of a circuit to tolerate noise is'a function of the equipment connected to it. The type of-equipment and the provision of noise
" filtering" components both play a part.
The original; design approach' at Rancho Seco was typical. of plants of similar vintage. The raceway design for ' thel original- 14,000 cables provided.two service levels for 600 volt' class cables [NEPM 5103 Section 5.4.5.1] (1.b) 480 Volt (and below) power, DC and control and (l.c) y instrumentation. No explicit definitions existed for either power, control, or instrument circuits. Service levels were indicated for raceways as follows: For Class 1. power and control raceway, the raceway designator begins with either the letter L, M P or W for Channel A, B, C, or D, respectively. For Non-Class 1 power-and control raceway, the raceway designator begins with the numeral 7. For Class 1 instrumentation raceway, the raceway designator begins 'I with either the letter A, B, C or D for Channel A, B, C or D, respectively. For Non-Class 1 instrumentation raceway, the raceway g designator begins with the letter X. 1 l _ _ _ - - . - - - - - 1
Enclosure To.GCA 87-780. n
-Attachment 4 Page 28 i, ,
'lTEM NO. 9 COREINUED Conduit is differentiated from cable tray by having all digitsL after the first, letter or number; cable tray is. identified by having both letters and numbers after the first' letter or: number raceway designator.
LFor exampler L27AF1 - Channel'A Power and' Control Cable Tray cM47223 - Channel'B. Power and Control ' Conduit Cable Tray 727BA1 - Non-Class 1 Power and Control 732007 -- Non-Class 1 Power and Control Conduit i A32AB2'- Channel A. Instrumentation Cable Tray ik D44301 - Channel D In'strumentation Conduit X44AD3 - Non-Class 1 Instrumentation Cable Tray X56032 - Non-Class 1 Instrumentation Conduit Scheme cable numbers did not indicate the service level [P, C or I] for-cables; .however, a standard practice was used which identified.all 600 volt. shielded cables [ twisted shielded pairs, coax, triax, etc.] as
. instrument 1 cables. This practice allowed latitude to the designers in classifying circuits as " instrument" when the circuits.were shielded.
For example, with.this approach, low amperage (0.5 amp) 120 Volt power supplies could be installed using shielded, twisted pair cable and run-with signal cables. When a field component (e.g. , flow transmitter) was
.provided with only one entry (conduit hub] this was an obvious practical approach, meeting the equipment supplier's intent.
For safety circuits, an unacceptable noise level is a plant safety issue. For this reason, the USAR wording requires separation of instrument cable from power and control cables for RPS and SFAS, while not explicitly addressing other systems. In practice, the design intent has.always been to maintain the same separation for all systems. Design
' Guides written in 1984 and later have attempted to provide more explicit direction with the. result that the design intent for the original 14,000 cables and cables installed later has become blurred.
Causes The direct cause for each identified problem [CRTS Action Items 2
'(partial),-and 5) will be addressed in each individual commentary. Not all identified problems are, upon examination, real problems. A major cause of both real and incorrectly identified " mix" problems is an inadequate definition of design intent in both USAR and design documents.
l
_ - _n 7 Enclosure
.ToLCCA 87-780
.. Attachment 4
*, Page 29 M -ITEM NO. 9 CONTINUED
.A description of the events and circumstances leading to the
' discrepancies identified .in LER 87-26 has been prepared: by IIRG [See:
/ Appendix.5]..
c Corrective Actions - Physical' Rework
.The' physical' reworking of cables because of mix problems is. identified iin the following:
LER 85-16. -Seven cables required relocation.- NCRs S-5263 and S-5968 were issued. ECNs R-0459 and R-1295 detail the work. LER 87-26. Twenty-eight cables required relocation. NCRs S-6561, S-6562, S-6563, S-6564, S-6565, and S-6566 were-issued. ECN R-1785 and' ECN R-1786 detail the work. ECN R-1785'was issued on July 23,-1987 and was cotapleted with a closure date of October 28, 1987. ECN'R-1786 was issued on June 29, 1987, and is. complete and.in the process of being closed, withia forecast closure date of. November 30, 1987.
'CRTS Database Discrepancies {CRTS Action Item 2]
' Sixteen routing ~ errors requiring relocation were identified by Impell as documented by:CPRs CPR-0611, 610, 885, 638, 640, 622, 642, and CONS CON-584 and 742 contained in Impe11 Calculation No. 271-101-109, Rev.
- 0. . Presently,.Impell is resolving SMUD review comments, with a resolution date of November 30, 1987.
Corrective Actions -' Changes to USAR and-Design Process JCRTS Database Since July 1987, the cable input documents [ Form E-1010] have been required to carry a designation "P" [ Power], "C" [ Control), or "I" [ Instrumentation) to indicate service level and easist in routing the cable in raceways of the proper service level.
' Additional service level designators are under consideration and include "T" [ Telephone), "S" [ Security] and "IE" [Inatrument-Exempt may mix with l P and/or: C cables). .i 1
A CRTS software enhancement is planned [CRTS Action Item 10) which will:
- Add a field for cable service level [P, C, I, etc.]
- Add a program feature to check cable service level against raceway service level.
I 4
} ;;. . . Yp {.O Enclosure . g L To GCA 87-780' U Attcchment 4 Page 30 lTEM No. 9 COMf1NUED
' F RNvisions.to Design Documents-The physical separation requirements for power, control and instrument circuits have-been defined as follows:
-Separate ^uduits, ducts, penetrations, and cable trays should be provided for.the following types of circuits:
(1) Medium voltage-(6~9kV) circuits. (2) ' Medium voltage'(4.16kV) circuits. (3) Lov voltage power (480V) circuits from 480V switchgear, with maintained spacing in trays. (4). Low voltage power (480V and below), control, and annunciator window input circuits, and selected shielded instrument. circuits approved by the Electrical and I & C Supervising Engineers.
'(5) Instrument circuits. requiring separate routing.
In vertically stacked trays, cable trays should be arranged in the order given above with the medium voltage cables in the highest position in the stack'.
- Control cables may be pulled with low voltage power cables, except when
~
their respective conductor sizes. differ _too greatly. t The instrument circuits requiring separate routing are the following: { (1) .All signal circuits from process instruments such as thermocouple, RTDs, transmitters,. neutron flur. detectors, accelerometers, level elements, radiation monitors, etc. (2) All. signal input circuits to computer and Anatec multiplexer, except for selected circuits which the Electrical and I & C Supervising Engineers specifically approve in writing for routing through power and control raceways. (3) All low energy level circuits (analog or digital), interfacing between instrument cabinets, and signal output circuits from instrument cabinets which control the plant equipment or device. L_.. _ .m _ _ _ _ . _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ . . _ _ _ _ _ _ _ _ . _ . -
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Enclosura ETo GCA'87-780- ' /: Attachment -4 Page 31 ITEM No. 9
, CORIINUED s
(4) All circuits requiring coaxial, twinaxial, triaxial, and i .. fiberoptic-cables. (Glass l'ex-core detector cables such as those for sourceirange and power. range ion chamber circuits. must be run in dedicated rigid steel conduits.) (5)- All low level and higher level analog circuits as addressed in Electrical Design Guide NEPM 5204.43, sections 5.5.4 & 5.5.5. (6) All signal circuits to panel mounted' instruments that are part of a process instrument loop and shown on instrument loop diagrams. (7) All other circuits. designated by the Instrument.and Control Group as instrument circuits. Revisions to the following: Engineering Design Documents were completed in July 1987. . These revisions are being applied to all new cabic work. NEPM 5204.22 ~ Design Guide - Cable System Design, General NEPM 5204.43 Design Guide - Instrumentation Systems Shielding and Grounding and Surge Protection
' Revisions to USAR 'l i
See commentary to CRTS Action Item 17.
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Enclosure To CCA 87-780 '\' 1 .I O L' . Attachment 4' Page 32 w- . p V!
'" . ITEM NO.o10 g
, . Description Demonstrate completeness'of CRTS, including software
< verification'and validation.
' COMMENTARY
-CHRONOLOGY g, General background-and initial actions concerning the CRTS program are described in CRTS Action Item l'[as-built verification) and 2 [ data discrepancies]. 'The' completeness question has two issues:
J1.- I'nstalled But Unrecorded Cables: Whether the CRTS data
' base includes all cables installed in the CRTS listed
- raceways.
.2. Dependable CRTS Program: Whether the CRTS software is
, complete, reliable, cad error free.
+..
;Gencric Implications..
w :
, -1. Installed But Unrecorded Cables Cables of two specific systems have been identified as having a incomplete cable records:
Security System - CRTS Action Item 11; approximate 1y'180 cables of.a. total population of 2000 not'in CRTS. Communication System - CRTS Action Item 13; approximately 450 cables, of.n total population of 1500,' notlin CRTS. [ Refer ~to referenced Action Items for additional detail.] The possibility has also been raised as to whether procedures existed which permitted cables [other than security / communication) to be installed without entries being made in the CRTS database. The procedure question has been investigated by.IIRC. An IIRG report has been issued [Ref. DTS 87-103 Dated Nov. 9, 1987) which indicates no evidence that other cables [than the
- tl security / communication cables identified] were installed without the'CRTS database being updated.
As of October.1987, the problem of unrecorded cables appears 1 confined to some security and communication systems without i "r generic impliction for other systems. Security and communication cables are installed only in non-safety-related
, raceway, which lessens the level of concern.
e=_: _ -
Enclosura-
/
To GCA 87-780. Attachment 4 1 1 Page 33 11EM NO. 10-CONIINUED Concerns with' installed but unrecorded cables exist related to raceway weight, raceway-fill, and to.the quantity of
. . . combustible material in open cable trays, 'However, the-quantities are'small'and without significant safety impact.
- 2. Dependable CRTS Program'.
' The CRTS sof tware . program was written by Control Data Corporation [CDC]'for SMUD. The program was run from 1980-through 1986 cn a CDC mainframe computer in Kansas City. The program is currently run.on a CDC Cyber- 180-830' computer installed at the Rancho Seco jobsite. Maintenance and enhancement is provided by CDC. The CRTS data'is. downloaded to a network of four personal computers for ease of handling b; CRTS . personnel.
'The CRTS software program is not a verified program meeting NuclearLQuality Standards. However, subroutines written for and executed on the PC network'are verified under a contractor
[1mpe11]-Q.A. program. The CRTS software program inventories cable and raceway data and performs design checks. The CRTS-database is'also a source of data for other calculations [e.g. combustible loadings of. cable insulation] and a. source of information on cable routes. The dependability of the CRTS software is
'therefore of safety significance to the plant, and the
' software requires verification to'the requirements of the SMUD Quality Program.
The design documents issued for construction have always included both the. input documents as well'as the CRTS generated. installation cards. This process provides verification of the cable route, since any difference between design intent [ input document] and CRTS record [ output cards) is readily apparent. I
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di L j Y. { ag . i : u, , -. '{ .' d LThsLoriginal'. software program.used':[EE553]Kis n'Bechte11 ' '
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, [ ,, ,' y ,'7L' nProgram which has been consistently maintained /' enhanced; an'd' g* verifiediby-its' owner. ;The CRTS software was written,by CDC
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i ', , .. [for sfUDL but received no. verification beyondithat! accorded to 6 icommercial software. ;The current software has1 forty-five;
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> >The database.\is-not' impacted; but reporls generatJd~from,the.
N/ f ; ' data conta n errors;.
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l Corrective Actions 4 , , Re , f: 11. Immediate-Actions - Pre Restart "
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- 1Attthe end of leptember 1987 forty-one: soft'are. w bugs;have'been, ,
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+ identified; !Four personnel have been"added [1 Programmer and; e
3; Engineers;-> 2 on V&V. and 11 on. data discrepancies] .1 A11.
-s'oftware" bugs will be= tracked;.through resolution; on'a;
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. database: established for.:that purpose. 'All problemswhich 4 ,
1 f R 1 . impact restart commitments.will he' identified'and corrected =
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.schedulef and; budget for the provision of upgraded (enhanced]
CRTS software, including verification.andt validation. m 8 ; '
. Part of this; process' is making'a". decision to either:
' 'O' Enhance'andverifytheexisting(CRTS'softwareor w
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6 The schedule will show-the upgraded software. verified and in place before the end of the Cycle 8 Outage. n g
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p Attachment 4 Page 35 ITEM NO. 10 CONTINUED . A listing of future CRTS enhancements has been provided by the-CRTS group as'follows: Software Enhancement List These enhancements are in a format for policy. decision-making.- Once given initial approval, then the enhancements must be. translated into software s pecifica tion . format , then given final' approval before software enhancement implementation.
"Needed,"- Sorted'by CRTS Staff Recommended Priority.
N1, Add a new type of CRTS report', for all report-options that giveslthe " proposed" database'only.. Type 3 is recommended for this option, to complement TYPE = 1 "as-built" database only, TYPE = 2 "as-built and proposed" now in use. N2. Revise raceway fill logic to be consistent with NEPs: and to have complete software control over overfill disallowances, and implement use of " justification codes" for overfill situations. Precedence of
" deleting" cables prior to " insertion" of-other j
- cables must be' enforced to keep fills below NEP limits.. " Sparing" cable logic is to be' revised so as not to inflate the overfill calculation-if an existing included cable is merely'having its scheme designation changed. [ Presently, computer tracks both "old" and "new" names and counts both in fill '
calculation, which unnecessarily inflates the result.] N3. Add a ' new feature for cable weights for " tray" raceways, to keep fills within USAR limits;
" justification codes" for overweight situations.
New software has to handle " split"' trays, where a partition separates a tray into " instrumentation" and " power / control" sections -- unit weight for such occurrences has to be combined to meet USAR 50 pound per linear foot limit. 1 m_ _ _ _ _ _ . _ _ _ _ _ .
r p f I Enclosure-h To GCA187-780 N Attachment 4 is. t Page 36 1 TEM NO. 10-
;g CONTINUED .
N4 Provide a' utility feature to. search the entireCRTS-database for every violation of.its current cable-raceway-equipment design logic,uat CRTS. operator initiation. This should be incorporated immediately after the two items.above. Thereafter, as each. new logic feature' is done, the _ utility feature should be revised to incorporate.each new logic' feature. N5. Revision to Quality Class 1, 2, 3 intermixing input-screening. Class 1 screening is adequate. Non-Class 1 needs revising to make use of
" justification codes" for presently acceptable configurations that may violate newer, non-applicable requirements.
,t. : N6. Revision to' service level intermixing input screening to disallow power / control / instrumentation cable intermixing in'same raceways. Use of
" justification codes" for-violations of updated logic.
N7. " Reserved" element tracking,'i.e., organizing the
' cable numbers, raceway! numbers, and equipment' designations reserved by designers so that when ECN/DCN packages get to CRTS staff; there are no conflicts among the various packages. . These need to become an adjunct database to the existing
" proposed".and "as-built" CRTS databases now used by CRTS software. [As a productivity measure, this is being implemented at the microcomputer level presently.]
I N8. Appropriate, limited read-only access to CRTS database via computer terminal placement within Design City [ Trailer 2] and among Modifications [ Construction] personnel. This would free time now used to answer many questions by CRTS staffers, to do other necessary CRTS work; Designers and constructors could interrogate the CRTS database on their own, N9. Add the capability to generate a "repull" card when an existing, installed cable is rerouted, in order to differentiate between new installation of cable
' and revision to an existing cable's route.
V l
L Enclo:ura To CCA 87-780i
, Attachment 4 Page 37
' ITEM NO. 10 CONTINUED -
" Desired," Sorted' by CRTS 'Staf f Recommended Priority-D.1 Additional cable and raceway enhancements t'o assist construction personnel -- new database fields: type of service, cable' jacket, conductor diameter-[versus "overall" diameter], bending radius, pulling tension, sidewall pressure, unit. weight, etc.
D.2 10 CFR 50 Appendix "R" supplementary information, i.e., fire protection features, such as fire area in which CRTS element resides,'-Appendix "R"' wraps on
. raceways, whether a given cable is related<to safe-shutdown considerations, whether a cable.is associated with " spurious operations equipment," etc.
D.3 Change of CRTS database principle from " position" orientation to ' complete history audit trail" orientation. l 3 i a i - - ~ . - - - - - _ - _ . . _ _ - . -. - -l
g my - a l Enclo:ure To'CCA 87-780 Attachment 4 i Page 38-ITEM NO. 11 DESCRIPTION' Show to what extent-~ security cables are documented in CRTS. COMMENTARY
' CHRONOLOGY ODR-87-409, dated April 9, 1987,. reports that 630 telephone and security.
~
q- - system cables are installed in the plant with incomplete documentation. Approximately'180 cables of a total population of 2000 security cables-are.not in CRTS. All security. cables are.r'ecorded in one of three data bases:
- 1. EE-553 (KL)
; 2. - CRTS-
~3. PC Data Base All security cables are in Non-Class 1 raceway.
GENERIC IMPLICATIONS The concern 'with the . incomplete documentation of the plant ~ security cables is due-.to potential ~ impacts upon cable tray weight, fill, and
-combustible content, as well as separation and mix concerns. However, since'the security cables are in either dedicated conduit or in
- Non-Class 'l racewaysi ' there is no , significant' impact upon safety cables. ' Resolution of this problem will be completed by the end of the.
Cycle 8 outage.
'CAUSES The cause of the incomplete security cable documentation has not yet been determined.
CORRECTIVE ACTIONS The immediate action to. prevent further undocumented security cable additions to the plant has been to require all design work to be reviewed by the Nuclear Engineering Department. Additional actions may be-taken later after further investigation of causes. l o
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Enclorura : To GCA'87-780, u , Attachment -4 c1-3 Page 39 1, ITEM NO.'12
. DESCRIPTION - Complete security cable documentation COMMENTARY o 4-
'To be performedjprior to the end of the Cycle'8: outage.-
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a Description- 'Show to what extent communication cables ~are documented 11n CRTS. , ' l 4 > f' t y : Commentary , 'l b
-l Chronology j ODR 87-409,. ' dated April 9,1987,. reports that 630 telephone and security
~
) ' system cables are installed in the plant with incomplete documentation.' l The communication cables include those fromLthe following systems: i PA - PublicEAddress (Dedicated' Conduit]- ls l SP:- Sound Powered [ Dedicated Conduit]' ' l
.CBX- Computer Based [Non-Safety Tray and Conduit]- J Exchange [ROLM) ]
CBX cablesLinclude. circuits for VHS radio and microwave' link.
' Communication cab'les are'sh'own~on series 700 drawings and ECN's.
Generic: Implications The concern.with.thejincomplete' documentation of the plant communication , cables is due to potential: impacts upon cable tray weight, fill and i combustible content, as well as separation and mix concerns. Howeveri. since.the. communication cables are in either dedicated conduit or in Non-Class 1 raceways, there is no significant impact upon safety
' cables.< Resolution of this problem will be completed by the end of the L Cycle 8 outage.
causes 1
-The cause of the incomplete communication cable documentation has not '
- yet been determined. A potential.cause is that since the communication cables'were installed by the Electrical Maintenance Department, conflicting procedures may have led to incomplete communication cable documentation, yg Corrective Actions The immediate action taken to prevent further undocumented communication I cable. additions to the plant has been to require all design work to be reviewed by the Nuclear Engineering Department. Additional actions may be taken later after further investigation of causec.
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,. Attachment 4 Page 41 ITEM NO. 14 1
DESCRIPTION ; Complete; communication cable documentation.' -l COMMENTARY-To be performed prihr. to the end' of the Cycle 8 outage. H . _ . l bn l-: : t I l' i
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; Thorough Root?Cause evaluations;have been performed:forlthrvmajor cablei problems' Reports:summarizingfthese;investi'gations"and:providing the' g%Q>
z.d ' y Jeauses' .have been . previously l transmitted [DTS 103, dated LNovember - 9,-
- 1987] underLaeparat'e1 cover'ftofthe NRC.,
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'C Page 43 ITEM NO. 16 DESCRIPTION Define major / minor / insignificant defects.
COMMENTARY . CHRONOLOGY : LThe Sample Plan [ Appendix (1)], prepared by Impell under SMUD Task 271, provides in Figures 9.1;'9.2 and 9.3 a flowchart methodology to classify the types of defects discovered by the circuit tracing walkdowns into major, minor' or . insignificant defects. .The NRC requested in ti.s May 6, 1987 meeting between f,he District.and the NRC that the District provide formal, written deff nitions of the types of defects, i o Majo'r, minor,-and insignificant defect definitions were given verbally to NRR during a site visit June 15 through 18,1987 Definitions [see below] will be included in the next revision of the Sampling Plan. The ; following was explained.to NRR. The' word " defect" is used in the Sampling Plan.to describe a cable route which is checked and found to differ from the CRTS recorded route. Defects are classified as either " major," " minor," or " insignificant." The classification is determined by reference to a set of. decision diagrams included as Figures 9.1, 9.2 and 9.3 in.the: Sample Plan' [ Appendix (1)].. For the convenience of reviewers, the following definitions will also be included: s l Major Defect i A major defect is a cable route which differs from the CRTS recorded 1 route and the difference constitutes a violation of the plant safety or
. design criteria. Corrective action is required.
Minor Defect A minor defect is a cable route which differs from the CRTS recorded route and the difference does not constitute a violation of the plant safety or design criteria. The corrective action is to correct the engineering' record with no change to plant configuration. Insignificant Defect i An insignificant defect is a cable route which differs from the CRTS recorded route only to the extent that typographical errors exist in the recorded data. The corrective action is to correct the errant data. 1 l
a-_-__ _ -_
Enclorura
.To GCA 87-780 Attachment 4:
Page 44 ITEM NO. 17 Description Revise USAR Commentary Chronology .The investigations into'the direct cause of a number of CRTS l j problems has. identified the need.to revise and clarify the wording used in Sections 5 and 8 of the USAR in a number of areas, as follows:
- 1. Section 5.1'.2.1.8.C.1.(b) [ Cable Tray and Bus Duct Supports] ;
The criteria.for cable tray supports limits the loading imposed on the tray to 50 pounds per linear foot. 'In fact, the 50 pounds per linear foot is'a minimum figure, and supports have been designed which accept higher pounds per linear foot values. 'This change is made for clarification: Existing Text
*'1.
(b) Cable tray loading of 50 pounds per. linear foot is used
.throughout regardless of tray width or anticipated weight of wire and cable.. In no case does actual weight of wire, cable and tray exceed this figure."
Revised Text "1. (b) A standard cable tray live loading of 50 pounds per linear. foot is used throughout regardless of tray width or anticipated weight of wire and cable. Some cable tray supports are' designed for loads which exceed 50 pounds per linear foot. In no case does the actual weight exceed the design limit."
- 2. Section 8.2.2.11.!!
This section provides criteria for the separation of redundant cables of safety circuits, but is unclear because it mixes general criteria for all safety circuits with specific criteria for RPS and ESFAS circuits, and does not clearly indicate what is general criteria and its applicability. This change is made for clarification: Existing Text "H. The. separation of redundant cables of the reactor protection system and safety features actuation system circuits is accomplished by spatial separation in accordance with the following criteria:" l 1 L ! L F
7 , s Enclosure To GCA 87-780 l ' Attachment ;4~ Page 45 ITEM NO. 17~ CONTINUED-Revised Text "H.,-The separation:of redundant cables of safety systems is
' accomplished by spatial separation in accordance.with the 4 criteria given'in.this section. Specific criteria-applicable only to' Reactor Protection System [RPS) and Engineered' Safety ,
Features Actuation System [ESFAS]' cables is included." l
- 3. Section 8.2.2.11.H.1
'As a result of NCR S-6594 and LER 87-26,.the District has performed a Safety Analysis, 50.59' log No. 1020, which requires the following change to the USAR text:
Existing Text
~"1. Separate cable tray conduit and penetration systems are......."
... Class I instrumentation circuits are routed in rigid metal conduits as explained in (2) below."
Revised Text
'"1. Separate raceway (cable tray, conduit and penetration)' systems are
... Class I instrumentation circuits are routed in metal raceway as explained in (2)'below."
- 4. Section 8.2.2.11.H.2 As~a result of NCR S-6594 and LER 87-26, the District has performed a Safety Analysis, 50.59 log No. 1020, which requires the following change to the USAR text, because the Babcock & Wilcox design interface criteria for RPS and ESFAS cables requires separate " raceway" and does not specifically require separate
" conduit."
Existing Text "2. Reactor protection system and safety' features actuation system instrumentation each have their channels routed in separate conduits and are physically separated from each other throughout the plant." Revised Text l lL "2. Reactor protection system and safety features actuation system instrumentation each have their channels routed in separate raceways
- l. and are phyuically separated from each other throughout the plant." i L
i 1______________'___u._ _.
m Enclorura. To GCA'87-780' Attachment 41 Page 46 1 TEM NO. 17
- CONTINUED -
- 5. Section 8.2.2.ll.H.5 As a ' result' of NCR S-6562 and LER 87-26, and per' the Safety Analysis, ~ 50.59 log No. 1002,.the USAR will be' changed as follows:
Existing Text "5. Power and control circuits are not' mixed with instrumentation circuits in any raceway for any system." Revised Text "5. Power and Control circuits are not mixed with instrumentation circuits.in any raceway for any system unless an engineering analysis for acceptability is performed."
- 6. - Section 8.2.2.11.H.9 Per.the. disposition of LER 87-24, the following change to the USAR has been committed to because both weight and ampacity considerations are different for power and control cables versus instrument cables. The following text change to USAR Section 8.2.2.ll.H.9 is planned to provide clarification and agreement with NEP 5204.22: !
Existing Text The maximum percentage fill in redundant trays is 40 percent and "9. ; wherever possible, it is kept at a much lower value." Revised Text "9. The maximum fill in trays is limited to prevent exceeding the cable ampacity rating in accordance with IPCEA No. P-46-426 and ICEA No. , P-54-440, and the designed weight of cable on the tray supports." l i Cable tray fill limitations are typically imposed because of the following: 0 All' cable trays - Load bearing capacity of tray and supports i o Power cable trays - Ampacity ratings of cables ; l i , 1 l l l- l l j l i l J
Enclorure To GCA' 87-780
~
Attachment 4 Page 47
-ITEM NO ' 17 CONTINUED .
The currentL status of these items at Rancho Seco are as follows: Load Beiring Capacity of !)able LTrays All tray weights 'without [ regard'to percent fill] have been checked againstl the' 50 pound per~ linear foot USAR limit and- will again be checked
-once more prior.to restart, as described in the commentary to CRTS Action :
~
Item 2. An enhancement is planned to the CRTS sof tware to calculate
.cablettray weights for all future design. changes,'without regard to fill
' level..
Ampacity Rating of Cables The"ampacitieslfor'600 volt 900C power and control cables routed through
- randomly. filled cable trays are based on either the number of. conductors.
[IPCEA No. P-46-426] or ' percent fill per ICEA No. P-54-440, typically '40% of n'4"' tray. Scheduled USAR: Revision
- These changes are scheduled for inclusion in the.next annual update of the USAR in July 1988, .,
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h-- [ EnclosureL To GCA 87-780 Attachment 4 Page 48 ITEH NO. 18
- DESCRIPTION lasue NEAP 4127.
m CONMENTARY:
. CHRONOLOGY.
The identification of concerns regarding CRTS completeness and missing CRTS' cards, followed. by the further identification of cable installation problems associated with LERs.85-16 and 86-10, led to the overall review of Rancho Seco cable installation procedures and practices as described in the Action Plan and this report. Initial direct cause determination, confirmed by the preliminary root cause evaluations, has identified that the' lack'of a formal procedure, by which proposed changes to the CRTS database are made,' and describing and controlling , the issuance and return of cable and raceway construction cards, wasLa contributing factor in cable and, raceway installation and documentation problems. It should be noted that no specific cabling problem appears to have been directly associated with or caused by the CRTS computer program itself, but that problems arose through not formalizing the procedure'by'which' cable' additions, modifications, and deletions are made to the plant, and controlled and inventoried by the cable and raceway construction cards and the CRTS database. GENERIC IMPLICATIONS Lack of a formal procedure to control changes to the CRTS database and hence control cable and raceway additions, modifications, and deletions to the plant, was a factor in the following types of cable problems at Rancho Seco: Cable' Tray Overfills and Overweights Prior to June 1987, formal procedures for the engineering review and acceptance of overfilled cable trays did.not exist. Rancho Seco cable tray supports are designed to support, as a minimum, a cable loading of 50lbs/ linear foot. The USAR specifies a cable tray fill I limit of 40% so that the cable tray nupport design of 50lbs/ linear foot is not exceeded. In the past, undocumented engineering reviews were made when cable additions to cable trays exceeded the cable tray fill limit. Neither the informal checks nor the supervisory approvals were proceduralized, and no documentation is available to i show that such reviews have been made.
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H Enclorura; To GCA'87-780- \,
-Attachment 4 Page 49' , ITEM NO. 18 CONTINUED Presently, NEAP 4127. " Cable and . Raceway Tracking System" prevents-the issuance of DCNs to CRTS-related drawings-[E-1008, 1010,1 1026, 1027: and 1028] unless an error-free report can be produced when the data is entered into the proposed database. If a design error is-detected, then the DCN is ' returned to the' originating engineer for resolution; Once an error-free report is produced, the DCN is'then submitted to the Electrical Supervising Enginee'r for approval.
Should-the CRTS error report indicate.an overfilled cable tray, the DCN is returned' for the engineering review and evaluation of the cable tray's included cables to verify that the~ cable tray support
~
design basis cable loading has not been exceeded. CRTS Completeness u The " completeness" issue'is discussed in the commentaries to CRTS Action Items 1, 2, 3 and 10. Concerns relate to whether or notlCRTS recorded cable locations match "as-built " the resolution of CRTS
- database: discrepancies, cables not recorded in the CRTS database and missing CRTS cards.
The formalization of CRTS procedures in NEAP 4127 provides the
' definitions andLresponsibilities suf ficient to control future cable and raceway additions, modifications, and deletions to the. plant.
NEAP 4127 formalizes the flow of DCNs to the CRTS-related drawings, as well as the flow of the CRTS generated cable and raceway installation cards to ensure the retention of completed cards to ensure CRTS cable and raceway locations match the "as-built" and to ensure that CRTS data is entered without errors. By procedure, error reports are run on data to be entered into the' proposed data-base and again, once construction is complete, during the final processing of completed cards, in order to ensure that the proposed data, as well as the "as-built" data, is error-free and reflects the actual plant configuration. CAUSES A summary of the overall root cause evaluations is contained in Appendix
'5.
CORRECTIVE ACTION e Corrective action has been to issue NEAP 4127 " Cable and Raceway Tracking System," on June 15, 1987, to control changes to the CRTS database and control cable and raceway modifications to the plant.
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'Enclosurei To GCA 87-780 Attachment 4 Page 50 ITEM NO. 19 DESCRIPTION Provide! bases.for acceptability of a 95/95 level of assurance-regarding cable routing.
E
' COMMENTARY-CHRONOLOGY
'The basis for>95/95 is given in the Sampling Plan [ Appendix (1)). Cable-sampling started in February 1987 and was completed on October 26, 1987.
'Following a meeting with SMUD on May 6, 1987, and a subsequent' telephone conference' call!on May 11, 1987, the NRC requested additional information.
SMUD RESPONSE The additional'information requested has been provided in an appendix'to the. commentary'to CRTS. Action Item 19 of the July Wire and Cable Program Report, GCA 87-400, dated ~ August' 18, 1987, and therefore will.no longer be
. included with this commentary, but will be referred to as Appendix 4 to this submittal of the~ Wire and Cable Program Report. Following issuance of
~ the SER supplement and final acceptance of the Sampling Plan, the supporting documentation will be maintained in NED files for' audit or-re-inspection.; Appendix 4'will be forwarded to NRR [in final form with
~ inspections complete] with the monthly Wire and Cable' Program Report. The appendix has been prepared by a SMUD consultant [Impe11] and:
-1. Provides information on established precedents.
( 2 '. . Provides additional information on the technical basis for the Sampling Plan and provides a comparison between the Rancho Seco Sampling Plan and Military Standard 105D and related plans. 4 j l _ _ _ _ _ t_ j
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-Enclosure To GCA 87-780 Attachment 4 Page 51
. ITEM NO. 20 DESCRIPTION Resolve NRC concerns about possible' biasing of sample.
~ COMMENTARY 4
CHRONOLOGY-Section 9.1 (3), Evaluation Process, of the Rancho Seco Sampling. Plan contains.the following statement:
"If a ' deviation does. exist between the CRTS' database routing and the "as-built"L routing, the. results are first checked against existing CPRs or CONS to determine if the deviation has already'been dispositioned. If this problem has been-dispcaitioned by a CPR or: CON, no defect-for that lot exists."
The question'was raised, by Mr. Faust Rosa;'at the May 6,1987 meeting as to whether the dispositioning of deviations,.by CPR or CON,' introduced a
-bias into the sampling.
'SMUD RESPONSE '
The response to the concern is provided in this commentary.- The process described in Section 9,1 (3) is essentially only-a correction of minor bookkeeping errors, none of which impacted the' cable route. 'Only seven cables ~had deviations which.were dispositioned as described. All are detailed herein and none had deviations which affected the route. No bias was introduced into the'sa'mpling by Section 9.1 (3). This commentary will be added to the Sample Plan in the next revision. I l 1 1
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-Enclosure To'GCA 87-780
' Attachment 4 Page 52 ITEM NO. 20 CONI 1NUED TABLE 1 l List of Circuit Tracing Walkdown Cables with CONS or CPRs The following ' list of ' cables are: part' of the CRTS circuit tracing sample cables and have:CRTS problems identified as CONS (*) or CPRs(**).
' Item Cable . Work Request-Number CON or CPR Designation --
1 - 1GlQ886AR 108063. CON-0118 CPR-0053 2 1M1A137 C 127745 CON-0001 3- - IP1A06 'D. 126992 CON-1018 4 1RIC260BB 128755 CPR-0865
- 5. 1RIC469CL '127708 CPR-0031 r 6. 'lR21R2H C 127006 CPR-0534 CPR-0672 17- 111B314 A 127022, .CPR-0866
- Conversion error reports (CONS) were generated for equipment, raceway,; and cable problems identified from .the June 1980 computer conversion error reports prepared by SMUD's contractor, Control Data Corporation, when Bechtel Power Corporation's EE-553 database was converted to the present CRTS database.
i > ** CRTS Problem Reports -(CPRs) were generated for equipment, raceway, and cable problems identified af ter the June 1980 conversion. i, The following describes the problems and resolutions stated on the associated L . CONS /CPRs and their impact on the circuit tracing walkdown effort. m i I l
-~_.__J__.___________
,p , -7 Enclosure 1 To GCA-87-780' 1 Attachment '4 Page 53. ITEM NO.'20 CONTINUED-Table 1 (continued): ITEM 1 Cable::lGlQ886AR on. CON-0118 and CPR-0053 Problems: CON-0118 states that the CRTS raceway vias do not of- match Bechtel's EE-553 cable routing. CPR-0053 states that the construction card's first' and last vias (" red") do not match CRTS first and last vias (" white"). Resolutions: CON-Oll8 -- Junction box' numbers were removed from CRTS vias and were confirmed by walkdown, CPR-0053 -- Inspection verified the cab 1d .is painted with " red." DC0 has been issued'to correct CRTS. Walkdown Impact: None on cable routing. ITEM 2 Cable: IM1A137 C on CON-0001 Problem: CON-0001 states that'CRTS vias show cable tray L43V36 connecting to 139BN5, but CRTS raceway connections do.notlshow them connecting. Resolution: CON-0001 -- CRTS Revision Level .1372, 02/16/87, raceway connections show tray L43V36 connecting to L39BN5. Walkdown Impact: None on cable routing. l l' l, l' 6 " - .
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'l' <, x . Problem ' CON-1018 states that."from"= termination of cable
'does'not. match' equipment:I.D. schedules.
l' Resolutibn: CON-1018- "From"; termination <is alsection of fa ,t panel. Panel is. listed in equipment I.D.- ' u a m schedule.' Lj
~
, , Walkdown Impact:', .None on cable routing. ' e
, ITEM: 4" m >
- l. .
Cable: J -1RIC260BB on CPR-0865 Problem: .CPR-0865 states that CRTS shows the cable h'as a deleted st.atus and removal of .the cable.'is not . j verified. L iResolutiont ..CPR-0865'- -Inspection' verified the cable is ' c
;being spared'and'has been reta8 Fed to 1B1PA0101~.
Cable'is deleted. -New sample cable selected. Walkdown Impact:
. ITEM 5 4
L -Cable: 1RIC469CL on CPR-0031 l P , ' Problem: CPR-0031-states that the pull card is not signed .1 v by QC. cv 1 ,s , Resolution: NCR was issued, and when dispositioned', the pull card will be signed by QC after inspection. Walkdown Impact: None on cable routing.- 4 l 0 Ni .. '. l - y l* i M -- - fic' ' 'j e L
jp-F [. Enclo:urs
~To:GCA 87-780 L
L ' Attachment 4 Page 55
-ITEM NO. 20.
CONTINUED Table 1 (continued) E ITEM 6
~
Cable: 1R21R2H C on CPR-0534 and CPR-0672 Problems: CPR-0534 states that the-cable is routed in. Class.2 overfilled tray. CPR-0672 states that the construction card-has not been received and that the number of conductors does not match design drawings. Resolutions: CPR-0534 -- Cables in overfilled tray were analyzed.. 1 CPR-0672 -- Resolution of Non-Class 1, problem on unsigned construction cards 1s-not completed. Walkdown Impact: None on cable routing. ITEM 7 Cable: 111B314 A on CPR-0866 Problem: CPR-0866 states'that CRTS shows the cable has a deleted status and removal of the cabic is not verified. Resolution: Inspection was performed and confirmed that the cable does not exist. Walkdown impact: Cable is deleted. New sample cable is selected. J
1 il jy ' Enclorure. To GCA 87-780-Y -Attachment' -4' Page 56 .i; , '.' . ITEM NO. 21-DESCRIPTION Provide'NRC with location.of cable pull cards.
- COMMENTARY' r
Refer .to commentary to CRTS Action Item 3. 1 'l
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'i 1 To GCA 87-780 Attachment 4 Page 57 ITEM NO. 22 DESCRIPTION. Provide.NRC with future plans for cable' pull cards.
COMMENTARY-Refer to commentary to CRTS Action Item 3. i l l l' l t I
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.I Enclorura em To GCA 87-780 t Attachment 4 Page 58
.g ITEM NO. 23
~
DESCRIPTION Redundant cabling in the same fire; area (LER 86-10'and 87-13).
. COMMENTARY CHRON0 LOG,Y Refer to Root Cause Investigation 86-10.
GENERIC' IMPLICATIONS LERs:86-10 and 87-13' identified'significant concerns'with Rancho Seco cable configuration _ control. LER 86-10 identified seven safety-related instrumentation cables in Fire Area 17 that'were not rerouted into
-fire-wrapped conduit as. required by'CRTS. ELER 87-13 identified seven safety related instrumentation cables that were not moved from Fire Area 36'to Fire Area 31 as required by CRTS. In both cases, the cable rerouting' was to have been performed under ECN A-4942, and in fact the subject cables were correctly routed per the original issue of ECN A-4942. _However,' the routing of the cables was revised several times after the initial issue of ECN A-4942, and the failure to subsequently:
reroute the cables resulted in LERs 86-10 and'87-13. In addition to the safe shutdown / Appendix "R"' concerns that arose as a result of the incorrectly routed cables, additional concerns identified by preliminary root cause investigations include that of adequate control of CRTS cable
- and raceway installation cards [See commentary to CRTS Action Items 3 and 18]'and the failure of the Electrical QC inspectors to verify proper
. location.and routing of the subject cables [ Notice of Violation 50-312/87-21/-01).
CAUSES {
- Refer to the summary of the Root Cause Investigation 86-10 [Appendir (5)] i for the root cause findings.
I CORRECTIVE ACTIONS In response to LER.86-10, Rancho Seco began an inspection _ program of safety-related cables to establish a level of confidence in the cable
' locations,.as well as the CRTS database. Based on the analysis of the misrouted cables in LER 86-10, and the lack of identified cable routing
-problems in the original plant cable population, the decision was made to J sample only those safety-related cables installed after commercial operation in_1975 [ justification provided'in commentary to CRTS Actica j
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Enclorur'e c To GCA 87-780 s Attachment 4' Page 59
.i' ITEM NO. 23 CONTINUED
. Item 7]. As described.in the Sampling Plan [ Appendix 1],'the
- post-commercial' operation safety-related cables have been' divided'into
- four._ sample populations and the objective has been to demonstrate with.a 195%-level of confidence that at least'95% of.the sampled population is correctly. installed.inathe plant per CRTS.; Cable inspection, as part'of d the Sampling. Plan, identified the.seven additional cable misroutes-
'f described in LER 87-13, and prompted the 100%' inspection of the Lot 4 sample population, which is complete with no; additional major defects.
. Additional cable misroutes were identified as de' scribed in ODRs 87-604 and 87-723, and have required the 100% inspection of the Lot 1 sample population, completed on October 26, 1987. Cable rerouting for those misrouted cables identified by-LER 86-10 was performed by.ECN R-0765 and is construction complete. Cable rerouting for those misrouted cables identified by LER 87-13 was performed by work request 128636 and is also complete. Misrouted cables identified'by ODRs'87-604 and 87-723 will be~
corrected by ECMs R-1785 and R-1786,. issued on July- 23, 1987 and June 26, 1987 respectively. Construction completion for R-1785 was on October 28, 1987 and closure for R-1786 is forecast for November 30, 1987. Additional 3 corrective action has been to include in the Modification
' Procedure / Inspection Standard MP/IS 307, "Cabic Installation,"
requirements to ensure that when installing cable,.that the design documents are the latest revision, and that the cable routing information-on the E-1010 series drawing matches that.on the applicable cable installation card. Further requirements have been included in MP/IS 307 by Procedure Change Notice, in order to clarify the requirements for~ witnessing cable pulls, as follows:
" Verify the cable is installed in the raceway specified by the applicable E-1010. series drawing. Verification shall consist of witnessing the installation of the cable."
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. Attachment 4 Page 60 ITEM NO. 24 ,
DESCRIPTION Provide ~ description of the: installation procedures and practices used' t' Rancho Seco for~the original cable population of 14,000',
.' cables.
f : COMMENTARY. CHRONOLOGY Refer to'the commentary to CRTS Action Item No. 7. e
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- 3, 4
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- Attachment- '4, j
'Page 61
]
s., . ITEM No.'25
' DESCRIPTION Document a thorough. engineering evaluation of the procedures and
. 1 j specifications'used to' install cable in the period 1975-1986. 4 COMMENTARY .,
CHRONOLOGY: , This'CRTS: Action Item stems from a lack of independent inspection for the j V insi.a11ation of approximately 1100 safety cables in the period 1983-1985. This is identified in.a draft Notice of Violation, included by NRC Region
~V, in a letter to SMUD dated ~ July 30, 1987,
Subject:
NRC Inspection Report. The concern'which exists is that the lack of' independent inspection could have resulted in not detecting damage to cable during installation. This engineering evaluation addresses the approximately 9000 ' cables installed : 1975-1986 and covers:two areas:
'1) -Adequacy of cable insta11ation' procedures and specifications used 1975-1986.
- 2) Evidence of cable damage experienced 1975-1986.
The'NRC Notice of Violation identifies a SMUD letter dated September 23, 1976 which stated that the Rancho Seco QA program complied with the ! guidance given in WASH NO. 1284. This document in turn invokes IEEE Standard 336-1971 [ ANSI N45.2.4-1972]. IEEE 336-1971 requires in Section 2.3 "Procedurec and Instructions" that " Installation, inspection, and test procedures and work instructions shall be prepared and documented for those activitie.s falling within the scope of this standard." Cable installation is covered in Section 4. This evaluation is made against the 1976 SMUD commitment.
- GENERIC IMPLICATIONS
'Approximately 14,000 cables were included in the original construction cable installation. Both the NRC and SMUD evaluations [NRC inspection report 50-312/87-21 Section 2.A.(1) and CRTS Action Item 7] accept the adequacy of' quality control in the original construction.
.The 9000 cables installed 1975-1986 may be summarized by year as follows.
The Class 1 cable, totals given are approximate and derive from Appendix 1 to the Wire and Cable Program' Report. The Class 2/3 cable totals are ratioed from the Class 1 totals. _ _ _ _ _ i
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4 ' Enclosura W Ao. .- t-
, To GCA 87-780 W '
Atitachment 4' u' Page 62 t ITEM NO. 25-CONTINUED Approximate Cable Distribution by Year
~
YEAR ' CABLES; CIASS 1 'NON-CLASS 1
- [ECN closure). ' INSTALLED CABLES CABLES l[3.425 X' Class-1]:
7 .i . '225 51 174:
'1975 '
66 15 51 (1976- '4 .1 3 1977 53 12 '41
.1978. 101- 23 78
.e '1979' 53 12 41 1980 598 135 463 1981 0 0 0 1982 0 0 0
.1983 3638 822 2816 1984' 828 187. 641 1985 '3315 749 2566 .l 1986 119 27* 92 : l L 9000 2034 6966
]
1
- * ' Includes 25 cables whose ECNs were closed in 1987. ? = Year not confirmed. !
.i The period 1983, 1984, 1985 saw 1758 Class 1 cables installed or over 86% of :l the total installed 1975 through 1986. A detailed evaluation has been made
~
..[ year by year] of:
o Installation specifications ; o Installation procedures j o Inspection procedures ! l
.This evaluation has determined that no Rancho Seco cable fnatallation specifications as such, existed during the years 1975 through 1981. However, !
~the required cable installation attributes were addressed by inspection i requirements contained in Construction Inspection . Data Reports [CIDRs)
' included with each work request package. Copies of CIDRs for 1978 and 1980 l are included as Appendix 6 of this report. From 1982 onward installation specifications existed and were adequate. Details are as follows: I
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I, Enclorora _ To GCA B7-780 Attachment. 4 Page 63 ITEM NO. 25 CONTINUED ADEQUACY'0F CABLE INSTALLATION PROCEDURES AND SPECIFICATIONSUSED-1975-1986 YEAR 1975
- Installation-Specifications: None.
' Insta11atiot Procedures: EM-145 Rev. 0 Inspection' Procedures: QCI 107 Rev. O, 1, 2,'3 Industry Guides / Standards: None Regulatory Standards:- None.
Compliance YES' N Cable. Installation' Specifications Issued? X t Material Handling Addressed?. X Cable Tensile Strength Addressed? , X Cable Sidewall Pressure Limitations Addressed?- X Cable Pulling Calculations Addressed? X. Installation Tension Measurements Addressed? X Cable Lubricants Addressed?. X Cable Bending Limitations' Addressed? X Installation Procedures Issued? X Inspection: Procedures Issued? X
- YEAR 1976 Installation Specifications: None Installation Proceduras:- EM-163 Rev. O Inspection Procedures: QCI 107 Rev. 3 Industry Guides / Standards: IEEE 336-1971 Regulatory Standards: Safety Guide 30 u . _ _ _ _ _ ______ _ _ _
Enclosure
.To GCA 87-780 1' Attachment 4-Page 64 ITEM NO. 25 CONTINUED Compliance YES NO Cable Installation Specifications Issued? X
-Material Handling Addressed? .
- X (16) [See Comment] d Cable. Tensile Strength Addressed? X (11)
Cable ~ Sidewall Pressure Limitations Addressed? X (11)
. Cable Pulling Calculations Addressed? X (11)
Installation Tension Measurements Addressed? X (11) Cable Lubricants Addressed? X (13) Cable' Bending Limitations Addressed? X ( 4) Incta11ation Procedures Issued? X Inspection Procedures Issued? X Comment: The intent of IEEE 336 and Safety Guide 30 were. met in the CIDRs. The # in parenthesis ( ) indicates the CIDR item as follows: Inspection _ . { Item inspection Requirement . Method 4.- Bending radius shall be in accordance with Visual' manufacturers recommendations and necessary requirements.
- 11. Pulling tension chall not exceed manufacturers Visual recommendations.
- 13. Excess' lubricant shall be removed from cable Visual immedietaly after pulling.
- 16. Purchase Order number, Manufacturer's Reel Verify number, DCN number, Work Request number, and Stock-Code number shall be recorded on the cable 'j pull card upon receiving cable from the warehouse.
- YEAR 1977 I' Installation Specifications: None.
Installation Procedures: EM-163 Rev. 0
- Inspection Procedures: QCI 107 Rev. 3 Industry Guides / Standards: IEEE 336-1971 !
IEEE 336-1977 IEEE 422-1977 I Regulatory Standards: Safety Guide 30 Compliance: See 1976 Response l ', wm_,.m_ _____ m. ___ _ _ . . - _ .
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Enclorura To GCA 87-780 ,
.a
' Attachment 4 Page 65 ITEM NO. 25 CONTINUED YEAR 1978,
; Installation Specifications: 'None-Installation Procedures: EM-163 Rev. 0,12,.3
' Inspection Procedures: QAP 29 Rev. 1
.QCI 107 Rev. 3,.4 Industry Guides / Standards: IEEE 336-1977 IEEE 422-1977 Regulatory Standards: Safety Guide 30.
Compliance:' See 1976 Response YEAR 1979' Installation Specifications: None
. Installation Procedures: EM-163 Rev. 3
' Inspection Procedures: QAP 29 Rev. 1 QCI 107 Rev. 4 Industry Guides / Standards: IEEE 336-1977
-IEEE 422-1977 Regulatory' Standards: Safety Guide 30 Compliance. See 1976~ Response '
YEAR 1980~
' Installation Specifications: None.
. Installation Procedures EM-163~Rev. 3 Inspection Procedures:. QAP 29 Rev. 1
, QCI 107 Rev. 4 Industry Guides / Standards: IEEE 336-1977 l- IEEE 336-1980 l- IEEE 422-1977 p Regulatory Standards: Safety Guide 30 J-Compliance: See 1976 Response 1 ?
I'
, i," , ! 5 t i e Enclo:ura
.To GCA 87-780 Attachment 4 Page 66 ITEM NO. 25 CONTINUED'
, YEAR 1981 Installation: Specifications: -None Installation Procedures: EM-163 Rev. 3 Inspection. Procedures: EII'EC-11 Rev. O EII G-2 Rev. 0 EII G-4 Rev. 0,' 1*
QAP 29 Rev. 1, 2, 3, 4 QCI 107 Rev. 4' Industry Guides / Standards: IEEE 336-1980 IEEE 422-1977
' Regulatory Standards: Safety. Guide 30
' Compliance: See 1976 Responses
- Effective Date Not Known YEAR 1982 Installation Specifications: CMP Rev. 0,1, 2 Installation Procedures: CMP Rev. O,1, 2 EM-163 Rev. 3 .,
' Inspection Procedures: EII EC-11 Rev. O, 1*' l 1
EII G-2 Rev. 0 EII G-4 Rev. O, 1* QAP 29 Rev. 4 QCI 107 Rev. 4 4 Industry Guides / Standards: ,
-)
. Regulatory Standards: Safety Guide 30 l
- Effective date not known.-
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-Enclo ure To GCA 87-780 Attachment. 4 Page 67 ITEM NO. 25.
CONTINUED Compliance Yes }B) . Cable Installation Specifications Issued? X Material Handling Addressed? X Cable Tensile. Strength Addressed? X Cable Sidewall Pressure Limitations Addressed? X Cable Pulling Calculations Addressed? X Installation Tension Measurements Addressed? X Cable Lubricants Addressed? X Cable Bending Limitations Addressed? X Installation Procedures Issued? X. Inspection Procedures Issued? X Comments: .The intent of IEEE 336, IEEE 422, and Safety Guide 30 were met. YEAR 1983 Installation Specifications: CMP Rev. 2, 3, 4, 5 3 Insta11ation' Procedures: CMP Rev. 2, 3, 4, 5 EM-163 Rev. 3 Inspection Procedures: EII EC-11 Rev. 1*, 2, 3 EII G-2 Rev. O, 1, 2 EII G-4 Rev. O, 1*, 2 QAP 29 Rev. 4 QCI 107 Rev. 4 QCP 330 Rev. 2,3,4 Industry Guides / Standards: IEEE 336-1980 IEEE 422-1977 Regulatory Standards: Safety Guide 30 Compliance: See 1982 Response I
- Effective Date Not Known I
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, Page 68 '
? r-f 3 4 S_ ' }' -f ( . ITEM NO."25 ~ S! CONTINUED
\
4
,.t , YEAR 1984: ,
- pi "
{Insta11a' tion 1 Specifications-
' ~
, 4 A' ~
. CMP Rev. 5, L 61 r, ,
- _
~ _
bInstallat1on1 Procedures: . " CMP'Rev.j!5, 6
,. -; LEM-163 Rev. 3, 4. <-
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'EII EC-11 Revi 3,
, ,i LIn'spection Procedtires. 4,,5,' 6 EII-G-2 Rev'. 2,-3' 4,.'5* ,
EII G-4 Rev.:2,1 3 ..i - w ' ' QAP 29 Rev. 4 IA 'QCI 107 Rev. 4 " -
"'n -
QCP 330 Rev.14,'.5
>IndustryL Guides'/ Standards:- 'IEEE'336-1980'
.o IEEE 422-1977
] '
'IEEE 690-1984
q -
- q. , .
Regulatory Standards:- Safety Guide'30-Compliance:' See 1982 Response
- Effective Date.Not Known.
s
. YEAR 1985-
' 4 IInsta11ation Specifications: CMP 6,17,c8, 9, 10 NEPM 5304.8C Rev. 0* Installation Procedures: CMP 6,.7, 8, 9, 10 EM-163 Rev. 4 NEP 6307 Rev. O Inspection Ptcocedures: EII EC-11 Rev. 6 EII G-2 Rev. 4, 5 EII G-4 Rev. 3,-4 NEP 6307 Rev. 0.. m; QAP-29.Rev. 4,'l c, - ' ,
~
QCI 107 Rev. 4,.5-QCP 330'Rev. 5 Industry Guides / Standards: IEEE 336-1980.
'IEEE'336-1985' IEEE 422-1977-IEEE.690-1984
'Reguletory Standards: Safety Guide 30
- Compliance: See 1982 Response
- Effective Date Not Known E
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-To GCA:87-780~
0 Attachment 4 Page 69 p 1 ITEM NO. 25' CONTINUED YEAR 1986' Installation Specifications:- NEPM 5304.8C 0*, l', 2 n.
. Installation Procedures: .EM-163 Rev. 4' MP/IS 307 Rev. 0 NEP 6307 Rev. O, hl' Inspection Procedures: MP/IS 307 Rev. 0.
NEP 6307 Rev. O, 1 QAP 29 Rev. 1, 2 QCI 107 Rev. 5 QCP 330 Rev. 5-
-Industry Guides / Standards: IEEE 336-1985 IEEE 442-1977
.IEEE 422-1986 IEEE 690-1984 Regulatory Standards: Safety. Guide 30 Compliance: See 1982 Response
- Effective Date Not Known.
YEAR 1987-Installation Specifications:~ IS-E-5304.8 Rev. O NEPM 5304.8C Rev. 2, 3 !
' Installation Procedures: EM-163 Rev. 4 MP/IS 307 Rev. 0
. Inspection Procedures: MP/IS 307 Rev. O QAP 29 Rev. 2 QCI 107 Rev. 5 Industry Guides / Standards: IEEE 336-1985-IEEE 442-1986 IEEE 690-1984 Regulatory Standards: Safety C<.i de 30
' Compliance: See 1982 Response
-J
pn n Enclosurn To GCA 87-780 -
' Attachment 4 Page 70 ITEM NO. 25 CONTINUED CONCLUSIONS' Of the'9000 cables' installed 1975-1986, approximately. 1080 [12.5%] were installed.1975 through 1981 without. issued cable installation specifications, but with the required inspections covered by CIDRs.
-The cables. installed after 1981 were' covered by installation specifications 1 which were adequate to prevent cable damage. Two conclusions are apparent:
1.. 87.5 percent of cables installed 1975-86 were installed while adequate installation specifications and procedures existed.; 12.5 percent'were insta11ed'without installation specifications, but with the inspection attributes covered by CIDRs. f
- 2. The. cab'es' l installed in the 1983, 84, 85 period were covered by adequate installation specifications and procedures.-
REFERENCES AND DOCUMENTATION The following is a list of the cable installation documents referenced in this commentary. Availability of copies at Rancho Seco is also indicated. Cable installation related specifications and procedures CMP Construction Methods and Procedures, Section III' Cable Installation Initial Release dated 6-4-82 Revision i dated 7-16-82 Revition 2 dated 7-29-82 Revision 3 dated 1-28-83 Revision 4 dated 4-6-83 Revision 5 dated 4-25-83 Revision 6 dated 11-16-84 Revision 7 dated 3-27 j Revision 8 dated 5-8-85 ' Revision 9 dated 5-15-85 Revision 10 dated 8-26-85 i Cancellation - dated unavailable Note: Revisions 1, 2, 4, 5, 6, 8, and 9 { were unavailable - i l i _ = - - _ . I
m
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,Enclo;ura To GCA 87-780 Attachment 4 Page-71
. ITEM'N0.2 25
.. CONTINUED EII EC-11 Engineering and Inspection Instruction-Manual '- Cable Installation During Construction and Major Modification
- Revision 0 ' dated 8-12-81;
' Revision 1 dated unavailable
. .c Revision 2 dated 1-29-83 Revision 3 dated 4-30-83 Revision 4 dated.3-20-84
.. Revision 5 dated 6-28-84
- Revision.6 dated 11-1-84 Cancellation date-unavailable Note: Revisions 0.through 5' were unavailable-EII G-2' Engineering and Inspection Instruction
' Manual - Site Construction Inspector (Generation Engineering Quality Control)
Revision 0 dated 8-12 T Revision 1 dated 1-29-83 _ Revision 2 dated 4-25-83 Revision 3 dated 3-28-84 Revision 4 dated 12-3-84 Revision 5 dated 1-7-85 Cancellation date unavailable Note: Revisions 0 through 4 were unavailable EII G-4 Engineering and Inspection Instruction Manual - Process of Construction Inspection Reports Revision 0 dated 8-12-81 Revision 1 dated unavailable Revision 2 dated 4-25-83 Revision 3 dated 3-28-84 ! Revision 4 dated 11-25-85 'f Cancellation date unavailable Note: Revisions 0 through 3 were unavailable i EM - 163 Electrical Maintenance - Installation j of Permanent Plant Cables Revision'0 dated 11-19-75 Revision 1 dated never issued Revision 2 dated 5-31-78 Revision 3 dated 10-6-78 )
- Revision 3 dated 10-9-80 1 Revision 4 dated 9-21-84
- Error was made in assigning revision number.
1 _____ _ ___ _ _ Q
y s hb / Enclo: sura
.To'GCA 87-780 JAttachment- 4 Page.72 ITEM NO. 25 CONTINUED.
IEEE 336- IEEE Standard Installation, and Testing Requirements For Instrumentation and Electrical Equipment During the Construction of Nuclear Power. Generating Stations. Initial issue 1971 E Revised 1977
; Revised 19801 Revised 19852 1 Title revised to: IEEE Standard Installation, Inspection, and Testing. Requirements.for Class 1EL Instrumentation and Electrical Equipment at Nuclear Power Generating Stations.
2 Title' revised to: IEEE Standard Installation, Inspection, and Testing Requirements for Power, Instrumentation, and Control Equipment at Nuclear Facilities. IEEE 422 IEEE_ Guide For The Design and Installation of Cable Systems in Power Generating Stations Initial issue 1977 Revised 1986 IEEE 690 IEEE Standard For The Design and Installation of j Cable Systems for Class 1E Circuits in Nuclear Power Generating Stations. Initial issue 1984 IS-E-5304.8 Installation Specification - Rancho Seco Nuclear Generating Station Installation Specification For Electrical Cable Installation and termination Initial issue dated 8-28-87 MP/IS 307 Modification Procedure / Inspection Standard Revision 0 dated 12-12-86 NEP 6307 Nuclear Engineering Procedure - Cable Installation f Initial issue dated 12-28-85 ( Revision 1 dated 10-17-86 Cancelled as of 12-12-86
Enclo;urs g 3;' 'To GCA 87-780-L
-Attachment 34 f: Page 73 i
ITEM NO. 25
~ CONTINUED NEPM 5304.8C' ' Nuclear' Engineering Procedure Manual -
Electrical Cable Insta11ation and t 1 Termination' <
-Initia1' issue dated unavailable
. Revision'1' dated 7-3-86 Revision 2 dated 11-6-86 Revision 3 dated 2-18-87 Cancelled as of 8-28-87 QAP-29. Construction. Inspection Revision 1'ated d 6-14-78 Revision 2 dated 2-10-81 Revision 3 dated 5-18-81 Revision 4 dated 9-1-81
'N
- Revision 1 dated 6-05-85
- Revision 2 dated 1-01-86 Cancelled 7-28-87
- Error was made in assigning revision-number QCI 107.. Quality Control Instruction-Installation Inspection of Electrical Cable, Wire, and Conduit.
Initial issued dated unavailable Revision i dated unavailable Revision'2 dated unavailable Revision 3 dated 9-30-75 l Revision 4 dated 8-4-78 i Revision 5 dated 3-12-85 Cancellation date not available Note: Revisions 0 through 2 were unavailable
'l QCP 330 Quality Control Procedure - Conduit and 1 Cable Inspection
]
'l Original dated 2-3-82 Revision 1 dated 3-15-82 i Revision 2 dated 5-18-82
- Revision 3 dated 2-3-83 Revision 4 dated 4-20-83 Revision 5 dated 1-18-84 i Cancelled as of 9-25-86
- Revision 3 changed title to Cable ,
Installation Inspection Procedure 1 Safety Quality Assurance Requirements For the Guide 30 Installation, Inspection, and Testing of , Instrumentation and Electrical Equipment. Initial issue 8-11-72.
r" m L
'Enclorura.
To GCA 87-780 Attachment 4 Page 74 ITEM NO. 25 CONTINUED Evidence of Cable Damage-Experienced 1975-1987 NCRs written during the period 1975-1987 were reviewed for evidence of Class'l cable damage during or after cable installation [see Table 1]. The review did not uncover a consistent patternLof cable damage during the installation process. The results of the review are as follows:- Twenty-three NCRs were written for damage done during or af ter the cable installation process. Eighteen of the' twenty-three described damage that occurred, or most likely occured, during the installation process [ cable = pulling and termination]. Eight of the eighteen described' damage or potential' damage.that occurred while cable was being installed fa raceway. The eight NCRs involved a total of twenty-five cables,'as shown on Table 2. Only one NCR [NCR S-3178] described a cable that failed in -service during the period 1975-1987. The "B" phase of the 5 Kv power cable feeding the "B" nuclear service raw water pump tripped on ground fault on May 18, 1983. The cause was identified as follows: " cable was damaged on initial installation." A temporary repair of the cable was completed on June 21, 1983 and the cable was placed back in service. 'ECN A-4905 was issued on February 16,.1964 to replace the entire cable, from the switchgear to the pump. During the replacement.of the repaired cable on May 21, 1985, the minimum training radius and the maximum allowable sidewall pressure for the new cable was exceeded as documented on NCR S-4726. The new cable was subsequently replaced in accordance with ECN R-0328. Conclusions The evidence of NCRs written during the period 1975-1987 does not indicate a generic problem of cabic damage during the cable installation process. Only twenty-five, out of approximately 2000 Class 1 cables installed, were identified as being damaged or potentially damaged during installation. Damaged cables were either replaced or repaired. References and Documentation Tables 1 and 2 are lists of the NCRs reviewed for this evaluation. i L_---.
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m - ru' -} Enclosura To GCA 87-780-Atta'chment 4'- Page 96 ITEM NO. 26 - DESCRIPTION Provide description of the events and circumstances leading to' the~misrouting of cable described in Leas' 85-16,' 86-10, 87 and 87-26.- COMMENTARY CHRONOLOGY Refer.to Root'.Cause investigations RC 85-24, RC'86-10.and RC 87-09
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' DESCRIPTION LProvide description of.the events and circumstances leading to the discrepancies discovered between the "as-built" cable routes'and the routes recorded in CRTS.
COMMENTARY' jfi= ., ; CHRONOLOGY-See Root Cause Report 87-03 Cable Raceway Tracking' System. i l' W d i i
L. 1' , I Enclosurs To GCA 87-780
' Attachment 4' Page 98-
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. ITEM N0; 28'
' Description' ' Provide the bases for acceptability of a 95/95 level of-assurance regarding cable routing.' [ Compared with_other Laccepted homogenous populations]
Commentary .. .
-The basis for acceptability of-a 95/95 level of assurance-regarding cable routing rests on two arguments:
- 1) Prior use of 95/95 acceptance criteria in Nuclear Power Plant Sampling Applications.
2)- " Application of 95/95 acceptance criteria to cable roittings. The response concerning prior acceptance of 95/95 is given in the response to CRTS Action Item 19 and is complete. Final" inspection results'are given in Table 1 at the end of this commentary. Application of 95/95 Acceptance Criteria To Cable Routings The confidence'leve1' established by the 95/95 acceptance criteria is.the conditional probability that the percentage of major defects in the total population is less than or equal to five percent.
'Two populations'[ Lots 1 and 4] have been given'100% inspections. The acceptance; criteria is applied to Lots 2 and 3, both of which have been sampled ~with the following results:
Lot 2 Lot 3 Population Sir.e: 1383 176 Sample Sizes 88 51 Major Defects: 0 0 [
7 3 d V . '*. , Enclosurs (To GCA 87-780 Attachment 4 Page 99 l ITEM NO. 28 1 CONTINUED Statistical' inferences using the Likelihood Density Function Method.are: Lot 2 Lot 3
Conclusion:
- With 95.2% confidence', With 96.0% confidence, it can be asserted that it can be' asserted that-96.8% or more of the 95.5%'or more of the circuits are properly circuits are properly routed. routed. [ Note: " Confidence" is the conditional probability'that the population from which the sample was drawn contains no fewer than 'X' percent acceptable items, given the evidence available from the sample.] Statistical inferences using Acceptance Sampling Methodology are: {For an acceptance number of zero) Lot 2 Lot 3
Conclusion:
'With 95.1% confidence, 'With 95.8% confidence, it can be asserted that it can be asserted that 96.7% of the circuits 94.9% of-the circuits.
are properly routed. are properly routed. [ Note: " Confidence" is the conditional probability of rejecting a lot containing 'X' percent discrepant items, given that a lot of that quality has been submitted.]
-I l
l l i ( l
Enclosure, To GCA 87-780
~ Attachment 4 Page 100 ITEM NO. 28 CONTINUED The' establishment'of Lot 3 separately from Lot 2 was'done in an attempt'to establish.whether the cards with " questionable" signatures' constituted a special class with'a common problem. With 29.0 percent of Lot 3 inspected,.this is clearly not the case, and the " questionable" signatures have no significance.
Therefore,. Lots 2 and 3 can be examined statistically by combining the total and-sampled populations. This gives a population: LOT 2 + Lot 3 Population Size:- 1559 Sample Size: 139 This allows the examination of the statistical inferences for the combined lots. These figures are: Statistical inferences using the Likelihood Density Function Method are Lot 2 + Lot 3
Conclusion:
With 95.2% confidence, it can be asserted that 98.0% or more of the circuits are properly routed. [ Note: " Confidence" is the conditional-probability that the population from which the sample was drawn contains no fewer than 'X' percent acceptable items, given the. evidence available from the sample.] i l l '- 1
'Enclo:ura "To GCA 87-780 Attachment 4' Page 101
~ e ITEM NO. 28 CONTINUED-
' Statistical inferences,using Acceptance Sampling-Methodology'are:
{For an acceptance number of zero) Lot 2 + Lot 3
Conclusion:
With 95.1% confidence, it can be asserted that. 97.9% of the circuits are properly routed. [ Note: " Confidence" is the conditional probability of rejecting a lot containing 'X' percent discrepant items, given that a lot of that quality has been submitted.]-
.A reliability level of 98% for the combined. population of 1559 would. indicate the possibility of 32 or fewer major defects. This possibility has to be evaluated' against the evidence produced by the' inspections and other sources':
19 major defects were found; 7 in Lot 4 and 12 in Lot 1. These' defects fall into 3 incidents as follows:
- 1. Seven (7] major defects in Lot 4 were all in one incident and'are documented in LER 87-13.' The seven cables wereito have been moved by ECN A-4942 from
. Fire Area 36 to Fire. Area 31, but.were left.in place. Associated with this incident are the seven additional cables that were to have been rerouted into fire wrapped conduit in Fire Area 17. The cables were identified by LER
- , 86-10 prior.to the start of the Sampling Program, and are not counted as major defects. .The misrouted cables could have caused a loss of redundancy' if a fire had occurred in'either Fire Area 17 or 36. The direct cause of the cable misrouting has been identified as personnel error.
1 i j e
-- - , . - _ , - _ . - - - - - - - - - - ~ , - - - - - - -
t-Enclosure To GCA 87-780 Attachment 4, Page 102-ITEM NO. 281 CONTINUED
- 2. ' Eleven'[11] Major Defects were found to 'have 'been caused in a second
~
incident in 1981 when a power and control tray'was re-tagged as an instrument' tray but without the eleven power and control cables being removed. The direct cause appears to be failure by construction to-pull back cable as required by design documents. 3.: One [1] Major Defect was caused in 1984 when a Class 1-conduit stopped; short of a floor blockout, causing the cable installer to complete the y 'last four feet of the route in a Non-Class 1 cable tray.' Evidence - Other Than Inspections An examination of all sources [such as LERs, ODRs, NCRs). for major defects in Populations 1, 2, 3, and 4 have found no major defects to add to the total of 19 found by'the-inspections other.than the 7 major defects reported in LER.86-10 i which.are'part of the'same incident reported in LER 87-13 and discussed as part of. incident #1.
- The. major defects found are therefore limited to the three incidents described.
~ This fact is strong evidence to'auggest that there was no systematic breakdown 1Ln.the design and/or installation process for cables but rather a limited number
-[3]~of specific incidents. This is taken as an indication that the real. number of' major defects, which would be found by a 100% inspection, is likely to be. 1' less than the statistically inferred totals.
= Correlation between earlier precedents [ established by NRC) for acceptance of 95/95. sampling-of safety related components [such as structural steel welds and concrete expansion bolts] is viewed as follows. p Given a possible discrepant [ major defect] population of 32, the following must occur coincidentally to impact plant safety. !
- 1) A major defect or defects have to exist in safety related components. j l
2). The major defect or defects have to involve a loss of redundancy in l safety' system. i
- 3) An incident or accident has to cause.a coincident failure in !
redundant safety systems. l) 4 1 4 1 I t l { j
V <+ l- ' l' Enclosure r To GCA 87-780 Attachment 4 Page 103
-ITEM NO. 28 CONTINUED The basis of the NRC acceptance of 95/95 sampling for structural steel weld
' inspections is assumed to be the. low probability of coincident weld failure in-supports of redundant systems. .The following must occur to cause a' loss of redundancy:;
- 1. A defective' weld must exist in the welded steel supporting a safety
. system.
- 2. A defective weld must also exist in the welded steel supporting the redundant safety' system.
- 3. An incident or-accident must cause stresses resulting in weld failures in welded supports for redundant safety systems.
- 4. The failures'must-be sufficiently severe to impair safety function
[in both setslof equipment].below an acceptable level. The basis of'the NRC acceptance of 95/95 sampling for concrete expansion bolts is~ assumed to be the low probability _of coincident failures in redundant safety related equfpment' The following must occur to cause a loss of redundancy:
- 1. Defects must exist in bolts holding down safety related equipment.
- 2. Defects must also exist in bolts holding down redundant safety related equipment.
l
- 3. An incident or accident must cause stresses resulting in bolt ,
failures in both sets iot equipment. I
- 4. The failures must be sufficiently severe to impair safety function
[in both sets of equipment] below an acceptable level. For major cefects in the cable routes of safety related cables the possibility of coincident failures in redundant safety systems is more complex. The types of major dcfects identified at Rancho Seco include: A. Redundant safety cables in the same fire area (14 cables in 1 l incident]. ]
.j B. Lack of acceptable separation between Class 1 cables'and Non-Class 1 y cables [2 cables in 1 incident]. !
I C. Lack of acceptable separation between Class 1 instrument cables and ) Class 1 power / control cable [42 cables in 6 incidents). j
)
)
l I _u
l Enclo::ura l To GCA 87-780 l 4 Attachment 4 Page 104 ITEM NO. 28' CONTINUED q A, B, and C defects have been identified in the Rancho Seco cable populations and are considered viable. Possible scenarios which could impact plant safety, are:
- 1. -Major Defect A. A fire causing a loss of redundancy. q
- 2. Major Defect B. An electrical overcurrent condition in a Non-Class 1 cable combined with a single failure in an overcurrent device. This could cause a condition in which a cable failure could impact a Class 1 cable [ lacking adequate separation] resulting in a loss of safety function.
- 3. Major Defect C. .An electrical transient in a power cable causing-a spurious control or indication signal in an instrument cable [ lacking adequate separation].
Scenario 1 postulates a single major defect resulting in a loss of redundancy.
- This would appear to indicate the need to reduce the possibility of major defects to a minimum. However, for a single incident or accident to.cause a loss of redundancy.the following'must occur:
Major Defect A
- 1. Redundant safety cables must exist in the same fire area.
- 2. A fire must be initiated.
- 3. The fire detection / prevention system must fail.
- 4. The fire must cause a loss of safety function in both IEEE 383 qualified
[ fire retardant] cables.
- 5. Neither loss of safety function is to a " fail-safe" condition.
Major Defect B !
- 1. A lack of acceptable separation must exist between a Class 1 cable and a Non-Class 1 cable, i
- 2. A failure must occur in the Non-Class 1 circuit conductor or component.
- 3. 'A failure must occur in a Non-Class 1 circuit protective device.
4.- The effects of the two failures must be sufficiently severe to cause a l failure in an adjacent Class 1 cable. i I
'd Lix-- 5
- - = -
n-Enclo;ura To GCA 87-780 p Attachment 4 ! Page 105 , ITEM NO. 28 _CONTINU ED - 5.- The Class 1 failure is not to a " fail-safe" condition. o' 1
- 6. a simultaneous failure must occur in a redundant. Class 1-circuit. H Major Defect C
- 1. A lackLof separation must. exist between'a Class 1 instrument cable and a. 1 power.or control. cable.
- 2. iki electricairtransienti must occur in the power or control cable causing n
" spike" [ electromagnetic induction] in.the instrument cable.
i
- 3. The magnitude of-the induced " spike" in the Class-1 instrument cable'must' l be sufficient to initiate a spurious action or indication in the.
instrument circuit'. { 1
- 4. A simultaneous failure must occur in a redundant instrument circuit.
From the evidence'and discussions provided it would appear that: The' number of major defects in Lot 2 and Lot 3 cable routes, that would be found by a 100%-inspection is likely to be less than thirty-two-[32]. The likelihood of major defects in cable routes causing a loss of y redundancy in safety systems is not higher than the likelihood for welds j and concrete expansion bolts sampled to the same level. { h Conclusion r The confidence / reliability levels for. Lot 2 and Lot 3 are as stated'above. .To l closely correlate'the sample results from three diverse populations appears impractical. -However, based on the logic presented in this commentary, the acceptance of 95/95 for sampling homogeneous populations is considered to be ~ equally valid for cable' routes as it is for weld inspections and inspections of. , concrete expansion bolts. l 1 i i l l 1 e- - _ _ _ _ - - - - - - - - - - - __-----_---_------_---_-J
Enclorurs To GCA 87-780 Attachment 4 Page-106
. ITEM NO. 28 00NTINUED Table 1 CRTS Circuit Tracing Results Description Lot 1 Lot 2 Lot 3 Lot 4 Lot 2 + 3 4
Population Size 397 1383 176 78 1559 H S Sample Size 245 152 88 51- 78 139 Circuits Traced 245 152 88 51 78 139 Major' Defects 11 1 0 0 7 0 Minor Defects 17 21 4 1 2 5 Insignificant or i No Defects 217 130 84 50 69 134 Statistical Infer. LDFM NA NA 95.2/96.8 96.0/95.5 NA 95.2/98.0 Statistical Infor. ASM* NA NA 95.1/96.7 95.8/94.9 NA 95.1/97.9 Total number of circuits traced = 614. [ Actual total was 617 but 3 Lot 2 inspections were not credited]
*For an acceptance number of zero.
DEFINITION OF LOTS Lot 1: Safety related and safe shutdown circuits with rerouted vias between commercial operation and December 22, 1986. Lot 2: Safety related and safe shutdown circuits without rerouted vias between commercial operation and December 22, 1986. Lot 3: Safety related and safe shutdown circuits without revised vias and questionable cable pull card signatures. Lot 4: Safety related and safe shutdown circuits with rerouted vias and questionable cable card signatures. ! l'
j-: k "i i Enclosure-To GCA 87-780 Attachment -4 l Page 107-ITEM No. 29'
- Description Provide an . itemized listing and description of. changes ~ in >
procedures ~and controls for cable design and installation which
'have been made in response to the identified: cable deficiencies'.
Commentary The changes in procedures and controls made in response to identified c able. deficiencies are part of the corrective actions taken by SMUD. To place the changes in context each identified cable deficiency is. discussed [when appropriate] relative to direct and root causes together.with a
' description and detail of each corrective action.
For convenience in considering corrective actions they are presented in six groups: 1.0 CRTS Procedures and Cable Design Interface.
- 2. 0 . CRTS Procedures and Cable Installation Interface.
3.0- CRTS and Engineering Design Problems. 4.0' CRTS and Data Discrepancies. 5.0 CRTS and Documents of Record. 6.0 CRTS and Software Problems. 1.0'CRTS PROCEDURES ~AND CABLE DESICN INTERFACE Report Ref: CRTS Action Items 1 and 2. Problem: Missing and discrepant CRTS data. Direct Cause: The direct cause of problems in the CRTS cable design
. interface area was a lack of CRTS use procedures.
Root Cause: The root cause of the CRTS problems is that neither Nuclear Engineering managencent nor the CRTS supervisor were adequately involved in the CRTS. [ Root cause 87-03, Appendix-5). Corrective For a detailed review of corrective actions against Actions: root cause evaluations see CRTS Action item #30. Immediate Corrective Actions - Pre Restart j 1.1 A procedure [ NEAP 4127, Rev. O, " Cable and Raceway Tracking System") was issued on June 15, 1987 and controls the method by which proposed changes to the CRIS data base are submitted, approved and incorporated. t um. m_.1._._I_
. Enclocure.
To CCA 87-780 Attachment 4 Page 108 ITEM No. 29' Continued
' l.2 As described _ in the commentary to CRTS Action 'ltem 6 a NED instruction given on May 1, 1987, and effective on June' 15, 1987, requires all CRTS input documents / forms to be handled as Drawing LChange Notices [ Reference.EECS 87-005, from E..J. Gough to the Electrical Engineering' Staff, dated May 1; 1987). This corrected a practice;in which new forms were issued _for all changes.
Future Corrective Actions - Pre or Post Restart 1.3'A full time CRTS' Administrator-[ contract employee] has been in place since April 2, 1986 and is responsible for implementation of NEAP 4127. A CRTS Coordinator [Section 4.7 of; NEAP 4127] receives and inputs data. SMUD Personnel Department has been advertising for a CRTS Group Leader since June 22, 1987. The' Group Leader hired by SMUD_will replace the CRTS Administrator after a suitable overlap. The_CRTS organization chart [ Figure (1)] is shown at the end of_this'section together with the organization chart for the NED Electrical section [ Figure (2)]. 2.0 CRTS PROCEDURES AND CABLE INSTALLATION ~ INTERFACE Report Ref CRTS Action Items- 1, 2, 11, 13 and 23.- Direct Cause: The direct cause of problems in the CRTS/ cable installation interface was a lack of CRTS use procedures. Root'Cause: The' root cause was a failure to have and/or use procedures for' cable design,-installation,' inspection, and repulling. [ Root Cause 87-09, Appendix 5]. For a detailed review of corrective actions against root cause evaluations see CRTS Action Item 30. Common CRTS problems with past installation practice and corrective actions are as follows:
2.1. Problem
Installation cards not returned to CRTS.
- l. Corrective
- Action: NEAP 4127 requires cards to be returned to the CRTS Coordinator and held.until the ECN is closed. The ECN cannot be closed until cards are returned to CRTS and the data accepted by the CRTS Coordinator.
2.2 Problem
"As-Built" corrections not reported on cards returned to CRTS Coordinator. t
7 , 7 . , 1 ,o g-
- l. , , u
. 'EnclosureD H '
To;GCAl87-780 Attachment '4-Page 109 11 TEM No. 29 Continued , D Corrective. Action:. NEAP 4127 requires Field Problem' Reports to be generated.if the des.'gn cannot be implemented'as shown-on the design drawings. Only." installed length"
.s; dimensions can be noted on the CRTS card; the practice of allowing field engineers to solve design problems and'then to note the "as built" changes on the'CRTS card is.not permitted.
Each MP/IS [ Modification Procedure / Installation Specification) is in the process of being revised to reflect the CRTS card handling procedures mandated by NEAP 4127. These revised specifications are forecast L for issue in November,
~
h 2.3 Problem: MP/IS.307 did not clearly specify that the inspection of a cable routing is a " hold point" or define that h verification of routing requires the installation to be witnessed. 1 Corrective i Action: LPCN #4 [ dated 7-1-87] to MP/IS 307, Rev. O, makes'the
. route inspection a " hold point" and requires the installation to be witnessed.
2.4LProblems' Rancho Seco has approximately 2500 Appendix R cables [2200 Class 1 and 300 Class 2/3] listed. The' list is a'"living" document'which is revised.on a periodic (" basis as ECNs are closed. The problem has been that no procedural requirement has existed to require QC inspection of Class 2 or 3 Appendix "R" cable routes. p Corrective !! Actions: Immediate Corrective Actions -- Pre Restart 2.4.1 Since May 1,1987 the Quality Department has been reviewing all Work Requests against a list of 300 Class 2/3 cables. All Appendix R cables have their routes inspected and a " hold point" is indicated on the cable pull card. 2.4.2 As of October 1, 1987 the NED Electrical Engineering physical design group has been identifying all proposed Appendix "R" circuity via field note on the E-1010 DCNs. [ Reference Memo EECS 87-040, dated l September 21, 1987.] l
Enclosure To GCA 87-780 Attachment 4 Page 110 ITEM NO. 29 Continued P 2.4.3 NEAP 4119 [ Nuclear Engineering Fire Protection Program Control'] is being revised to require identification of the Appendix R circuits on the CRTS cable input
' document [ Form E-1010]. Issue is forecast'for November. 15, 1987.
2.4.4 As'part of the review of procedures associated with the resolution to CRTS Action Item 25, the Quality Assurance Procedures [QAPs] and the Modification Procedures / Inspection Instructions [MP/IS's] associated with cable'insta11ation and inspection will be revised to include the requirement to inspect.the Class 2 and 3 Appendix R cables to the . same requirements as for Class 1 cable installations. The appropriate QAPs and MP/IS's will be revised prior to restart. Future Corrective Actions -- Post Restart 2.4.5 CRTS software enhancement to create a field in the electrical circuit schedule, as well as' the cable cards, to indicate the service level of the cable ) {"P", "C" or "I"] and to identify the Appendix "R" cables ["R"] will be completed prior to the end.of the Cycle 8 outage [see commentary to CRTS Action Item. 10]. In addition, the E-1010 form will be revised to allow the above information to be input into the CRTS database.
2.5 Problem
Incomplete security cable and communication cable documentation in CRTS. Corrective Action: A scoping statement was added to Nuclear Engineering Procedure NEP 4109 " Configuration Control," that requires that all permanant changes to the physical or functional characteristics of Rancho Seco be reviewed and controlled by Nuclear Engineering via the ECN i process. This change appears in Revision 7 to NEP 4109, dated July 29, 1987.
)
i 3.0 CRTS AND ENGINEERING DESIGN PROBLEMS 3.1 POWER AND/OR CONTROL CABLE MIXING WITH INSTRUMENT CABLES Report Ref: CRTS Action Items 9 and 17. Direct Cause: The direct causes are either
.J . <r y 3 4; ,
Enclosure:
To GCA 87-780' Attachment 4 1 Page 111
- ;z ITEM No. 29
-Continued
.l . . Construction ' error [0DRs 87-109, 87-723, 87-735, NCR s-5968]
or. 2.- Design error. [NCRsS-5263,.S-6523,'S-6561I S-6562, S-6563, S-6564, S-6566, S-6999). Root Causet Root cause of intermixing was the failure to have and/or.use proc'edures for cable design,
~ installation, inspection and repulling; [ Root cause 87-09. Appendix 5].
-For a detailed review of corrective actions
.against root cause evaluations see CRTS Action Item 30.
Corrective Actions: Immediate Corrective Actions -- Pre Restart 3.1.1 Issue NED clarification of the physical separation requirements for power, control and instrument [P, C and I] cables.. This clarification istincluded in the commentaries to CRTS Action Items 9 and.17 and covers changes ~to both,NED Design. Guides and USAR. No
~
revision is required ~ to the installation specification for cable IIS-E-5304.8) because separation of cables by service level [P, C or I] is defined in the design drawings and not in IS-E-5304.8. 3.1.2 Issue NED direction requiring the identification of all cables on CRTS input documents [ Form 1010] as "P" [ Power), "C" [ Control] or "1" [ Instrumentation]. A memo [EEGS 87-006] from E. J. Gough to the Electrical Engineering Staff, dated May 4,1987, was issued l directing the following: l\
" Effective immediately, each new cable scheme number shall have its service level [ power, j control and instrumentation (analog or digital)]
shown on E-1010's." 3.1.3 Revise NEPM 5204.22 and NEPM 5204.43 to define required separation between power, control and ; l' < instrument cables in raceways and manholes (PCNs
-issued on both, dated July 27, 1987).
L t V _ _ _ _ _ _ _ _ _ _ _ _ _ _ ______________ _ ___ __ ________ _ - _)
S I l s , .n - L n' ,w > a ,' Enclosure-l " qq , , To'GCA 87-780
' Attachment 4l l: _ ,Page 112
-ITEM NO. 29 Continued-l Future Corrective Astions {Before end of Cycle 8 outagej-13.1.4 CRTS softwara will Fe' enhanced to screen raceways for service ' level mixing [P and/or C.with'I] and. block proposed changes which violate Design Criteria; 3.2. CABLE TRAY FILL AND WEIGHT CONCERNS Report Ref: CRTS Action Items 6 and 8.
l Direct'Cauce: Inadequate' procedural guidance Root C The root cause of the ~u erweight cable. tray problem is the failure to ensure adequate
- implementation of USAR requirements. [ Root cause 87-05, Appendix 5]
For detailed review of corrective actions against i' root cause evaluations see CRTS Action Item 30. 1: Corrective
- i. Actions:
'Immediate Corrective Actions -- Pre Restart 3.2.1 All cable tray weights have been calculated regardless of percent fill. This' process will be repeated prior to restart. No tray weights exist which exceed the 50 lb/lf figure.
3.2.2 NEAP 4127 is issued and governs the CRTS process. Step 5.2.4 requires proposed changes, which violate design limits, to be returned to the originator, as follows:
"5.2.4 After entry, an error report is generated to ensure that the proposed changes are feasible and do not violate design limits.-
If the report indicates design errors, the CRTS coordinator notifies the originator. The originator resolves the problems and provides corrected DCNs to the CRTS 1 coordinates." The design limits imposed by the CRTS program are process controls at this time. CRTS staff are directed to return all DCNs to Engineering when the addition of cables to trays: L_: __ - _ _ _ -
Encle urs
'To GCA 87-780 Attechmnt 4
,9 ;. Page 113 s > ITEM NO. 29 4e -Continued 0 Increases. power and control tray fills above 40%. 0 ' Increases instrument tray fills above 50%.
-The power and control trays are given a 50.59. review-for weight and ampacity limits. LInstrument trays are-reviewed for weight only. Checked cable. trays which
. exceed limits are re-designed and re-submitted.
Checked cable trays which meet design limits are
~re-submitted to CRTS after the 50.59 review.. The weight and dimensional data'for the approximately 450 cable codes will be validated against available manufacturers data or validated against a sample or model.
3.2. 3 - The lack of 50.59 reviews for design work done in 1975-1986 will be resolved through the NCR process with a forecast completion date of November.30, 1987.- Future Corrective Actions (Before end of Cycle 8 Outage] 3.2.4 .USAR wording will be revised and clarified as described in the commentary to CRTS Action' Item No. 17. 3.2.5. Following completion of the completeness checks on CRTS content [CRTS Action Items 10, 11, 12, 13 and 14] the impact of any added cables will be reviewed. In. addition the impact of weight contributions from various sources such as cable tray covers and l, protective fire wraps will-be checked against design l limits. 1 3.2.6 CRTS software will be enhanced to automatically block l cable additions which exceed design limits. In f addition to calculating percentage fill, CRTS will j calculate weight per cable tray section. Design j changes which exceed the minimum 50 lbs/ linear foot i limit will not be accepted without a 50.59 review. l 14.0 CRTS AND DATA DISCREPANCIES j l Report Ref: CRTS Action Item 2 j
.)
Direct Cause: Inadequate procedural guidance. i Root Cause: The root cause of the problems related to the CRTS and its use is that neither Nuclear Engineering management a nor the CRTS Supervisor were adequately involved in the CRTS. Corrective j Actions: l l l a
wxx
. il ;
Enclorura To CCA 87-780 r Attachment 4 i Page 114-J ITEM NO. 29-
~
Continued
'The large number of data dist.npancies concerning the Rancho Seco
' Cable Raceway Tracking System , originate from a number of sources.
.Many of these problems have occurred because'of;a lack of procedural guidance, such as the intermixing-of power, control'and-
- instrumentation esbles, the overfilling of raceways and the misrouting of cables'and are discussed elsewhere in this commentary, as well as in separate commentaries within this report.
It is important to note that no physical cable problems nor CRTS data discrepancies have been-caused by,the CRTS program itself, but have.all been caused by' sources external to the CRTS program, and'as described in Section 6.0, thel software problems affect solely the ability.to generate the various CRTS reports and have not affected the accuracy of the CRTS database, -l nor has data been lost.-
'I An additional source of. potential data discrepancies that'must be
. examined would be the possibility of data discrepancies occurring during the inputting of data into the'CRTS database. This. question was raised with the CRTS staff and it has been determined that an insignificant number of data discrepancies can be attributed to this source, for the following reasons:
- 1) The CRTS software performs checking of input data. Errant data such as non-existent cable codes or non-existent raceways [in cable routes) cannot be entered since the self-checking mechanisms in the CRTS program would block such errors.
- 2) A hardcopy is made of all newly entered data and is checked by the CRTS staff to ensure that the data has been input correctly. In addition, upon ECN closure, when the " proposed" data is changed to "as-built" data, the yellow DCNs to the CRTS related drawings are checked against the database to verify the accuracy of.the database.
- 3) The Card Control Group, upon receipt of the CRTS generated cards, compares the data on the cards against the DCNs to the applicable CRTS-related drawings (E-1008 and E-1010) to ensure that the data was input. correctly into the database.
Individually, each of the above three methods does not provide complete assurance against data input errors, however, together the three methods provide an interlocking mechanism to screen out Cata input errors to the CRTS datab ase. Of the approximately 8000 total CRTS database discrepancies listed in the Action Plan [ Appendix (2)], l approximately 2500 are document discrepancies. Of the 2500 document i discrepancies, none are as a result of a mismatch between the CRTS-related drawings and the CRTS database itself. \ ? Oi___ __
Enclosure To.GCA 87-780 Attachment 4' Page 115 ITEM NO. 29 Continued As a result of corrective actions for other CRTS related problems, an-increased emphasis has been placed on formalizing the methods by which the CRTS' staff performs its work, as well as how the CRTS staff
, interfaces with the other plant groups,.such as the Card Control Group and the Records'information Center. This is being done by a CRTS office procedure, as well as a flow chart [ Figure (3)] delineating the CRTS staff interfaces with the Card Control Group and the Records Information Center. Forecast completion for proceduralizing the activities of the CRTS staff is prior to the end of the Cycle 8 outage.
5.0 CRTS AND DOCUMENTS OF RECORD l L Report Ref: CRTS Action Items 3 and 22. Problem: The documents of record [CRTS cards] for cable and raceway installed at' Rancho Seco are incomplete. I~ CRTS input documents [ Form 1010, etc.] were not being controlled as Drawing Change Notices. Direct Cause: Lack of CRTS use procedures. Root Cause: The root cause of the problems related to the CRTS and its use is that neither Nuclear Engineering management nor the CRTS Supervisor were adequately involved in the CRTS. Corrective Actions: Corrective Actions for both Installation Verification Records and Engineering Design Records are as follows: Installation Verification Records The installation verification records for installed cable and raceway at Rancho Seco are the signed cable " pull cards" and " raceway installation" cards, respectively. The original cards for the 14,000 cables and 13,000 raceways installed during the construction of Rancho Seco have not been found. Facsimile copies exist as attachments to the Construction Inspection Data Reports (CIDRs), and require sorting and filing to verify completeness. This activity will be performed prior to the end of the Cycle 8 outage, Presently, after the signed, completed CRTS generated cards are returned to the CRTS group, the cards are microfilmed by the Records Information Center, to be part of the permanent plant microfilm record. The cards are then returned to the CRTS group for storage in the Bechtel Building vault, which is a secure, locked room with cement walls and a Halon fire protection system. As described in the commentary to CRTS Action Item 3, not all CRTS generated cards have been located. Corrective action is to generate
,J- ,
.i } /
Enclosure To GCA 87-780-Attachment 4 - Page 116 - l ITEM'NO. 29 Continued replacement cards, to-be checked aga' inst the design ducuments.
- Checked cards will. be stamped " Replacement Card" and will . then be-
! signed'by the checker.. This: activity will be completed for Class 1~
and ' Appendix' "R" pull- cards before restart and for ~all other cards before the end of thel Cycle 8 outage. .In addition, NEAP'4127 was
~
issued in June,-1987 and is. considered adequate to control the CRTS generated cards.in the future; see also Section 2.0 of:this' commentary. Engineering Design Record NEAP 4127, " Cable and Raceway Tracking System," defines the CRTS-related drawings'as follows: E-1008 Shows raceway sections,. including attributes and connections. E-1010 'Shows cables, including termination, cable code, conductors, and vias as applicable. E-1026 Adds, deletes or modifies a raceway code.
.E-1027 Adds, deletes or modifies a cable code.
E-1028 Adds, deletes or modifies an equipment number. In January,1987 ODR 87-66 and NCR S-6278 document that the E-1010 drawings were not being processed in accordance with Nuclear Engineering Procedures. As corrective action, a memo [EEGS 87-005) from E.J. Gough to the Electrical Engineering Staff, dated May 1, 1987, was issued to require that the CRTS-related drawings be issued and revised per NEP 4103 and NEP 4112, respectively. 1 6.0 CRTS AND SOFWARE PROBLEMS 1 Report Ref: CRTS Action Item 10. -
-l Problem: The CRTS sof tware has 41 identified bugs, d
]
1 Direct Cause: The direct cause of CRTS sof tware bugs is the lack of j verification'of the CDC software. l Root Cause: A root cause investigation is not required. The direct cause is considered definitive. . l 1
, s ,
. I, e
+
i Enclosurey jc , To GCA 87-780 Attachment 4 s 1. Page 117 ITEM'NO.'29 Continued Corrective Actions: Immediate Actions -- Pre Restart.
. Four personnel have~been added to; correct software problers, le computer data base'has been established to track the forty-one identified bugse to resolution. All bugs which impact restart commitments'will be identified'and corrected prior to restart.
Future - Post Restart
' SMUD (IMS).is preparing a-scheddle andLbudget~fdr providing upgraded CRTS software, including verification. 'The schedule will-show.the upgraded software verified and in place before the conclusion ~of the
-Cycle 8 outage.
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- Encl osure' . - .
.h ~ To GCA 87-780: -
. RANCHO SECO NUCLEAR GENERATING STATION CABLE RACEWAY TRACKING SYSTEM (CRTS) . !
,,., ORGANIZATION CHART' F ,
l DOUGLAS'M, PALMER' CRTS ADMINISTRATOR .r r-. 1 BARBARA YOUNGQUIST JEFF JORGENSEN '{CRTS ENGINEER -OPEN)' . CRTS COORDINATOR CRTS COMPUTER APPLIC ENGR Technical Procedures ' Administrative Support - Computer Applications Software Enhancements CRTS Processing. Technical Support validatlon/ Verification-CRTS Card Control Software Specifications i I. JULIE FRANKS ALEXANDER PARAS MICHAEL CURLEY ('
.\- -
ENGINEERING AIDE CRTS Processing - CRTS ELECTRICAL ENGINEER Cable Code Vendor Werk - CRTS ENGINEER. Bug Tracking . Discrepancy Fixing Bug Fix Testing- Construction Liaison t . STEPHANIE PATTERSON MICHAEL KYLLO
/ DATA ENTRY CLERK .CRTS ENGINEER -
CRTS Processing - CRTS Card Control 1 .
'l RONALD WATSON CLERK CRIS Card Control Clerking Duties l
Ef fective Date: 09-23 87 Revision Date: 09 28 87 ! Computer File: CR T S . 00.1 4
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.i Enclosure To GCA 87-780 Attachment 4 Page 121 IIEM NO. 30 DESCRIPTION Review of corrective actions against root.cause evaluations.-
COMMENTARY A table summarizing direct and root causes is included at the end of this commentary. 'A detailed review of recommendations contained in each root cause is given in the commentary. ROOT CAUSE 86-10 Redundant cabling in the same fire area [LER 86-10j .
SUMMARY
, .The direct-cause of the failure to reroute the cables is personnel error. Although the construction field engineer was aware of the routing revisions, he did not initiate the field installation of the "C" revision of the cable routing. The underlying cause is that the Card Control Group [CCG) did not follow Engineering and Inspection Instruction [EII] EC-10 " Processing of Installation Cards." A contributing cause of this event was Quality Assurance's failure to perform adequate inspections of cable installations. The root cause is the failure of the Card Control Group cognizant engineer to implement adequate managerial controls. He did not require the use of adequate and formal procedures for the processing of installation cards by the CCG. Recommendations Corrective Actions 1.-4. Issue a procedure (s) which CRTS card control is described in
- 7. 8. establishes instructions for Attachment 1 to NEAP 4127, Rev. O.
- 16. the processing of cable in- Attachment 1 is a CRTS flowchart
- 17. stallation cards. which illustrates the process from ECN issue to the filing of the CRTS cards following ECN closure.
A more detailed card handling process is provided in a card flow-chart included as part of CRTS Action Item 29 commentary. This flowchart illustrates the decision-making process used by the Card Control Group [see organization chart for CRTS also included with the Item 29 commentary) in handling cards.
Encicturh-
@ g 'To GCA 87-7801 Attachment 4 Page 122 ITEM NO. 30 CONTINUED-Recommendations Corrective Actions The Card Flowchart illustrates the work process in place at.this time.
-A written document, to proceduralize >
the process.shown on the Card Flow-chart, is being prepared:as an Electrical Engineering Instruction [EEI]. The forecast issue date is December 7, 1987. 5 .- After the procedure in recom- Following issuance of the Card mendation number 1 is issued, Control EEI, formal training will be train the Card Control Group conducted for personne1'who are- [CCG] personnel on'the proce- either in the' Card Control Group or 'i dure. who handle CRTS cards in the inter-facing groups.[ Modifications, Maint-tenance, Quality Control, etc.] . This training will be conducted for,- new personnel entering these groups-in an ongoing process. Training-will be conducted under the aus-pices of the Nuclear Engineering
; Dept. [NED] with classroom training and with records maintained in both NED files and by the Nuclear 4 Training Group.
{
- 9. EccdoAish a SMUD signature SMUD Support Services-Records 'l q
t.- A ripti < policy. Management Group [RMG) has ! established policies and practices f concerning records' management. 1 These policies and practices are defined in a Rancho Seco Administration Manu~' [RSAP]. RSAP-0601 " Nuclear Rece anagement" l does not permit , transcription of signatures. . Section 5.2.9 l
" Replacing a Lost Damaged or j Contaminated Document" governs the i process by which lost or damaged 'I records are replaced. " Recreated" originals are allowed for information [ data) documents but control measures are imposed on other records which require j assessments and evidence to support J restored records. RMG has no plans l to establish a SMUD signature transcription policy. Transcribing l signatures without compliance with l RSAP 0601 would be a violation of l SMUD administration policy.
L =_ - - -- i
t .. Enclotura To GCA 87-780 Attachment 4' Page 123 ITEM NO. 30' CONTINUED Recommendations Corrective Actions
.11. Evaluate the cable in- MP/IS-307 will be evaluated against' 12-17. spectionLrequirements as the findings of the CRTS Action' Item stated in MP/IS-307 to en . 25. " Document a thorough engineer-sure thatLthe following are ing evaluation of the procedures.
adequately addressed: and specifications used to install cable in'the period.1975 - 1986."
- a. Cable pulls are'in- The scheduled issue date'for the-spected before the . revised MP/IS-307 is Dec.'11,.1987.
cable'is terminated as
-required by the USAR.
- b. Cables are verified to be routed in accordance with the latest design drawings.
- c. . Clear guidelines. exist for the_ inspection of pulled back and repulled cable.
- 6. Route the cables described.in LER 86-10: The' cable rerouting for -f LER 86-10 and LER 87-13 in cables identified in accordance with the applic- LER 86-10 was performed able design drawings under ECN R-0765 and is (completed). construction complete.
LER 87-13: The cable rerouting for cables identified in ' LER 87-13 was performed under Work Request 128636 and is con- , struction complete. )
]
ROOT CAUSE 87-03
' Cable Raceway Tracking System.
SUMMARY
' The root cause of the problems related to the CRTS and its use is that neither Nuclear Engineering management nor the CRTS supervisor were adequately involved in the CRTS. j Recommendations Corrective Actions
- 1. None, NEAP-4127 " Cable and Complete Raceway Tracking System" was issued on June 15, 1987.
1
- ,~ Enclosurs To GCA 87-75d
-Attachment 4 Page 124 ITEM NO. 30 CONTINUED i
Recommendations Corrective Actions 2.- : Revise procedure NEP-4109 Drawing Change. Notice'[DCN]
" Configuration Control" to preparation,. processing and address the CRTS review of incorporation [into records) ,
DCNs. . are controlled by NEAP-4112- !
" Drawing Change Notice" [DCN].
NEAP-4112 will-be reviewed.and revised to specifically. address the processing of CRTS input documents [ Forms E-1008, E-1010, E-1026, E-1027, E-1028] which are defined-as DCNs and controllad by NEAP-4112. The scheduled issue ! date for the revised NEAP-4112 is j December 11, 1987.
- 3. Review and approve for use a .An uncontrolled CRTS Users 091de is CRTS User's Guide. currently in.use by the CRTS Card Control Group (CCG). . This document will be. superseded by two guides:
o Card Control Group CRTS Users Guide o Design Group CRTS' Users i Guide The former will be the definitive document of the two, and will be-used by CCG. The latter will be used by engineers and designers per- j forming physical design work. Both I documents are scheduled for issue on December 14, 1987. 4.8. Verify and validate CRTS The corrective actions are described software. in the commentary to CRTS Action a Item 10. 5.9 Develop and implement The commentary to CRTS Action a schedule to correct all Item 2 contains the general known CRTS deficiencies. commitment that:
- 1. All safety-related discrep- !
ancies will be dis- 1 positioned, with i documentation, prior to j restart. o , b i
.Encic::urs To GCA 87-780s Attachment 4 Page 125' ITEM NO. 30 CONTINUED Recommendations Corrective Actions
- 2. All non-safety-related
' discrepancies will be dis-positioned, with docu-mentation, prior to'the end of the Cycle 8 outage.
-Attachments.1, 2,'and 3 of the' Wire and Cable Program Report provide an
.index to CRTS action items, CRTS ODRs, and CRTS NCRs which track all discrepancies and their dispositions.
- 6. Include the CRTS system in NEAP 4127 was issued on June 15, .
-the-Quality Assurance 1987. NEAPS are. controlled by.the !
program. Rancho Seco Quality Assurance program. This item is complete. . s
- 7. Establish the design basis- A CRTS System Design Basis f
.for the uses of the CRTS Document will be written as part I system.- of the NED/ Electrical Discipline
. program to furnish design basis I documents defining the criteria for- [and the scope and function of] all - electrical systems. < The CRTS System Design Basis j Document is scheduled for issue ; prior to the end of the Cycle 8 ) outage. l ROOT CAUSE 87-05 Overweight cable trays [LER 87-24].
SUMMARY
j The direct cause of the overweight cable tray problem is inadequate procedural
. guidance.
The root cause of the overweight cable tray problem is the failure to ensure )
' adequate procedural implementation of USAR requirements.
1 L ; j p e . L__ - 1 '_...n_._ !
Encletura To GCA 87-780
, ' Attachment 4 Page 126 ITEM NO. 30 CONTINUED _
Recommendations Corrective Actions
- 1. Perform 10 CFR'50.59 Safety The 50.59freviews will be performed
. Analysis Reviews for the re- via the NCR process, with a fore-dundant [SFAS and RPS] Class cast completion date of November 30, 1E cable ~ trays that exceed 1987.
the USAR fill limit of 40%. i I
'2. Provide calculations to The corrective actions'for over- i i < verify the cable. tray load- . filled cable trays'are contained in ing for all overfilled the commentaries to CRTS Action ,
l cable trays. Items. 6 and lB. An additional commitment to check all tray. weights [regardless.of fill level] prior to restart is' contained in the commentary to CRTS Action . Item
- 2. This recheck is scheduled for mid-December.
- 4. Proceduralize the approval CRTS error reports indicating tray cycle required.to exceed the overfill conditions.cause the DCNs fill limits on cable. trays. to be returned to the originator for resolution. This is described in the commentary to CRTS Action Item 8. .This review process is being proceduralized in an EEI a (Electrical Engineering Instruction] scheduled for issue in June 1988.
- 5. Resolve the discrepancy be- The USAR revision to. provide tween procedure NEP 5204.22 reconciliation between USAR Section and the USAR. 8.2.2.11.H.9 and NEP 5204.22 is described in Section 6 of the commentary to CRIS Action Item 17.
- 6. Evaluate adding a subroutine The commentary to CRTS Action Item to the CRTS to calculate cable 10 includes a list of software en- ;
tray weights. hancements. Enhancement N3 will 1 provide a weight calc 11ation for all cable trays regardless of fill level.
!. q ROOT CAUSE 87-09 l Unacceptable intermixing of power / control and j instrumentation cables [LER 87-26]. ]
i i i ma_.1_ _ ___ )
,7en,7- - - - - - - V ,
" ' Enclo;ure- .y JTo GCA 87-780 c
' Attachment 4 Page 127
.V ITEM NO. 30' CONTINUED-
SUMMARY
~
Cable' tray A28AA3'and A28AB3
- Direct:Cause: Construction error.
Underlying'Cause: : Construction personnel failure to follow Procedure-EC-10. Contributing.Cause: Failure-of QC to detect construction error. Cable Tray A28AN3
- Direct Cause: Design error.
Contributing'Cause: Lack of'a comprehensive service level designator. Cable Tray A28AA1 Direct Cause: Either a design error or a construction error during construction of the plant. Contributing Cause: Lack of a comprehensive service -level designator.
- Routing RPS/SFAS Cables in Tray' Rather than Conduit -
Direct Cause: Original _ design' error. , l
' Underlying Cause: Lack of training.
i
' Cables Associated with DHS X-Tie Flow Transmitters Direct Cause: Design error.
Underlying Ccuse: Lack of training. Cables Associated with RCS Flow Transmitters Direct Cause: Original Design error. Underlying Cause: Lack of training, q i ROOT CAUSE (Overall) Failure to have and/or use procedures for cable design, installation, L . inspection, and repulling. ; 1 - _ _ - - _ _ _ . . _ l
-- - ~m ,
'Enclo;urs To GCA 87-780 Attachment 4~
Page 128 ITEM No' 30 CONTINUED Recommendations ' Corrective Actions
.(1) Revise electrical design' .The USAR text is being revised procedures to include USAR -as described'in CRTS Action requirements. Item Commentary 17.
Corresponding revisions to Design Documents NEPM 5204.22 and NEPH 5204.43 were issued.on October 5,. 1987. Refer to'CRTS-Action Item Commentary 9 for details.. 1 (2) Require'the. witnessing of; Complete. PCN #4 [7-1-87] revised' cable pulls.by electrical MP/IS 307. See commentary to CRTS QC inspectors. [ completed] Action Item 29 [Section 2.3]. (3) Evaluate the training given Supervisors attend numerous training to District-supervisors to programs provided by SMUD to improve. ensure that they are fully their management skills. There is cognizant of their' areas of no formal training on their. specific'
-responsibilities. . areas of responsibilities. Informal.
training is provided by.the supervisors respective manager. (4) Assure that all QC inspectors Complete. receive training on District procedures. [ completed]- (5) Provide a service level desig- Since July, 1987 cable input nator for all electrical cables. documents are marked "P" [ Power),
"C" [ Control] or "I"
[ Instrumentation]. Software enhancements are also planned. See CRTS Action Item Commentaries 9 and 10 for details. 1 (6). Provide the necessary CRIS Refer to-the commentary to CRTS software for the verification Action Item 10. . that intermixing conditions do not exist.
.l
'] 1 (7). Evaluate the necessity for a Per MP/IS 307, cable installation CRTS generated repull card. is performed using both the E-1010 series drawing and the CRTS i generated card. Repulls are j presently indicated on the E-1910 series drawing via field note. The ,
recommendation to generate a unique l CRTS repull card will also be included in the list of CRTS enhancements in the commentary to CRTS Action Item 10. b
i
'Enclorura.
To GCA 87-780-Attachment-4 Page 129 ITEM NO. 30 CONTINUED Recommendations Corrective Actions
'(8) Issue' procedures for:the use Complete. NEAP.4127 was issued of~the CRTS. (completed] June 15, 1987 (9) Establish the design basis for See response'to RC 87-03 (11); theLuses of_the;CRTS system recommendation 7.
.(15) L[RC 87-03, recommendation 7].
'(10) 4 Revise / issue: procedures for See response to RC 86-10
, cable insta11ation'to address recommendation 11.c the pull back and rerouting of' cable in-revised routings.
[RC 86-10, recommendation.11.c] (12)f : Evaluate the training given to New engineers attend an orientation entry level engineers to assure and indoctrination course where-that theyLreceive training on specific. Licensing Basis Documents their assigned functions. [LBD),and pertinent job related references are discussed.
^
System training is,also provided and is geared to the-job respons-ibilities' of the individual employee. (14) LIssue a procedure-for the See response to RC 86-10 processing of installation recommendation 1. cards. [RC 86-10, recommendation 1] l (16) Ensure that.all engineers, in- All engineers are trained [with cluding contractors, receive documentation) by reading-training on USAR requirements selected NED'and project adminis-for their job function. trative procedures as assigned by the NED Training Coordinator. Additionally, selected SMUD and contract personnel are trained to Rancho Seco LBDs as applicable to 10CFR50.59 reviews. l ROOT CAUSE 87-02
' Pulled cables stored in safety-related breaker cubicles [LER 87-16) .
SUMMARY
The direct cause of the coiled cables being lef t in all the cabinets, other
' than A405 and A409, was a planning error: the cable terminations should have been scheduled to occur immediately following the cable pull, but were not.
L'
, Enclosure i E To'GCA'87-780 Attachment 4 Page 130 ITEM No. 30 CONr1NUED
'The direct cause of the coiled' cables being left in cabinets A405 and A409 was a design error;_the effects of the' coiled spare cables on the seismic analysis were not considered.
The Root Cause of cables being left coiled and unrestrained in safety-related breaker cubicle cabinets was inadequate procedures for the installation of - 4 electrical-cables. Recommendations Corrective' Actions
- 1. Evaluate the pulling of cables into See response to RC 86-10 Recommen-and the colling of cables in exist- dation ll. [For. recommendations ing plant equipment. Based on the 1, 2, 3, 4 and.5].
findings of the evaluation, revise Procedure EM.187 and the commitments made in LER 87-16. Update LER 87-16, as appropriate.
- 2. Revise EM.187 " Control of Electrical Plant Modifications "
to either:
- 1) provide guidelines for the cable configuration where the cable has been pulled
'into existing plant equipment and cable
-termination will not be accomplished immediately after the cable pull or .
- 2) prohibit the pulling into and coiling of cable in existing plant equipment. _j
- 3. Provide guidelines in the Maintenance and Modification Department' procedures concerning j what types of equipment or what equipment may have cables pulled into and coiled when termination is not scheduled to occur I
immediately. L-______1__ _z - - i
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, Enclosure
~
i
'To GCA 87-780 l 1
Attachmetit 4' (- ! Page 131 ITEM.No. 30 { CONTINUED ] Recommendations Corrective Actions I 4 Revise KP/1S.307, " Cable Li 3- Installation," and:EM.163;
, .i , " Installation of, Permanent Plant Cables," to' describe l the process'by which; cables are. declared to be spares.
1 Revise Procedure AP.44, 5.,
'
- Plant Modifications - ECN Implementation " to include-the coordination of work be-tween Construction and' Electrical Maintenance per- ,
1 sonnel'for. electrical modifications. l, l i __ _ _ . ____._m_
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