The revised section also includes minor rewriting of several paragraphs to clarify issues raised by the Secretariat over the past two weeks.

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2 CLIENTSPEOPLEPERFORMANCE 21 Nvember 2011 MrlanGibb l, 61/27017/11682 Manager Asset Management Systems Western Pwer Crpratin 6 Wellingtn Street PERTH WA 6000 Dear Ian Asset Management Systems Review 2011 Amended Final Reprt Attached is the amended Final Reprt incrprating the fllwing changes t Sectin 4..1 as discussed with Western Pwer. The number f wd ple inspectins cmpleted during the audit perid was recrded at interview with Western Pwer staff as 290,18. As this number culd nt be verified with the data and infrmatin prvided by Western Pwer, we have decided t treat the infrmatin as unverified arid therefre remved it frm the revised reprt: The revised sectin als includes minr rewriting f several paragraphs t clarify issues raised by the Secretariat ver the past tw weeks. The fllwing changes have been made t the Final Reprt: Page 48, sectin 4..1, first paragraph, first sentence - ple sample target changed t "at least 84" frm "94", Page 48, sectin 4..1, first paragraph, secnd sentence - ple ppulatin changes t "26,250" frm "297,900"' Page 48, sectin 4..1, secnd paragraph.first sentence - "f 400 recrds" added t "...sample data set", Page 49, sectin 4..1, sixth paragraph, secnd sentence - target ple inspectin number fr 18 Q mnth perid changed t "26,250", i. Page 49, sectin 4..1, sixth paragraph, fifth sentence - ple inspectin number fr Nv 09 t Jun 10 changed t "12,44", c_ 0) Page 49, sectin 4..1, sixth paragraph, seventh sentence - ple inspectin ttal number changed t "258,565", > Page49, sectin-4..1, sixth paragraph,,eight sentence - ple inspectin ttal number changed t c - "258,565" and ple reprts nt laded in DFMS changed t "75,095",? Page 49, sectin 4..1, sixth paragraph, ninth sentence - percentage f ple inspectins nt recrded changes t 29%, Page 49, sectin sixth paragraph, final sentence - deleted. < Is) IS) GHD Pty Ltd ABN 9 008,488 7 GITID Huse 29 Adelaide Terrace Perth WA 6004 PO Bx 106 Perth Adelaide TOE WA 682 Australia T F Epermail@ghd.cm Wwww.ghd.cm

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4 Table 5 Wd Ple Evidence Reviewed Dcument Name DM Number Ple Inspectin Results - Line KW-MSR Wd Ple Inspectin Guidelines Ple Failure Data 2009/ Ple Investigatin Prcess Overview Ple Based Inspectin Prgram Wd Ple Management Plan Ple Failure Data 2010/ Ausples Investigatin Reprt Asset Data Reprt Metadata Ple Inspectin Extract Map Ple inspectin Extract frm DFMS Western Pwer's Wd Ple Management Systems: Regulatry Cmpliance Assessment. Detailed Technical Reprt, 20 Octber Distributin Wd Ple Audit Review, A Review f Western Pwer's Respnse t the 2006 Regulatry Cmpliance Assessment f Western Pwer's Distributin Wd Ple Management Systems, May Energy Safety Order Number Inspectin Prgram The investigatin int the prgramming f inspectins was based n selecting at least 84 ple inspectin recrds frm DFMS using a randm ple number generatr which had been develped by Western Pwer fr quality auditing f DFMS recrds. The sample number was selected t achieve a 95% cnfidence level with a sample size f 26,250 ple inspectins due within the 18 mnths f the audit perid with a 5% margin f errr. The data extract prcess is described in the Asset Data Extract Metadata (DM# ) and pltted in a map (DM#844466) f the Licence bundaries t demnstrate that the sample ples is a gd representatin acrss the SWIS netwrk. The investigatin reviewed all f the recrds in the data extract f 400 recrds and checked 4 recrds in the sample set with the data reprted in DFMS. This investigatin fund that Western Pwer was fllwing the prcedures and plicy in inspecting ples, recrding the utcmes f the gd wd tests, and detennining the strength index. Within the sample data set f 400 recrds, 11 ples had been classified as unserviceable (nine PI and tw P2) based n the gd wd and serviceability index. 196 ples were recrded as serviceable r reinfrceable pririty recrds had n entry against the "Results f Ple Serviceability" field. The 11 unserviceable recrds were checked in DFMS and the data in the extract aligned with the DFMS 61/27017/1107.dcx Asset Management System Review Final Reprt 48 m O ' 7 m (Q c_ 0) r-h 5' > C r-t- - O IS) < > z < Is)

5 recrds. The Serviceability Index calculatin and assessment f "serviceability" was in accrdance with the prcedure in Wd Ple Inspectin Guidelines (DM# ). 17 recrds had default installed dates f 1/1/1901 and 84 recrds had 1/1/1970. Of these, all f the 1901 dates had estimated install dates frm the field inspectins and 46 f the 1970 recrds had estimated dates. Western Pwer were aware f the default dates in their data set, but advised that as age was nt used in predicting maintenance r ple replacement, crrecting this data was a lw pririty. They als advised that they were similariy aware f the missing data in a number f fields and had instigated changes t their field data capture prcesses t ensure that all essential data field were cmpleted by the field inspectrs. The Wd Ple Inspectin Guidelines dcument includes a significant amunt f infrmatin n the prcess f determining the gd wd test results and determinatin f the serviceability index, but nly a single paragraph t assessing the crss arm, insulatrs and lines. Westem Pwer advised that the infrmatin n inspecting ther equipment attached t the ples is included in the Catalgue f Inspectin Types and Definitins. Hwever, this is nt a prcedures dcument and the prcess f assessing the cnditin f the nn-ple elements is reliant n the inspectr's awareness f the Catalgue and the field data cllectin frms. Finding 11/07. Recmmend that the Wd Ple Inspectin Guidelines sectin n nn-ple asset elements shuld be expanded t include the nn-ple inspectin infrmatin n what is t be inspected and the assessment measurement prtcls within the ne dcument. The investigatin int wd ple investigatins cvered the management f Inspectin Backlgs ver the audit perid. The investigatin lked at the Ple Inspectin Backlg Reprt (DM# ), Bundled Ple Inspectin Services 09/10 and 10/11 (DM#62188 and DM# ), Bundle Ple Inspectin Backlg by Asset ID and Maintenance Zne July 2011(DM# ) and Ple inspectin Extract frm DFMS (DM# ). The investigatin als included interviews with Anesh Bdhram, David Langdn, Rger Petit, Stu Green, Andy Neeman, Nick Hward, Will Wng, Steve Samuels, Allan Michertn, Sundy Tjhim, Ian Winks, Cn Zaekis, Jhan Jankwitz and Eddie Kuen. The DFMS data extract prvided evidence that 18,470 ples had been inspected during the 18 mnths f the audit perid. As there is 60,000 distributin wd ples which are t be inspected nce every fur years, mre than 26,250 ples (1.5 x 60,000 / 4) shuld have been inspected t reduce the backlg n ples inspectins. Western Pwer staff als advised that all but 942 ples had been inspected in the last fur years. The difference between the targets and that reprted in DFMS was discussed with Western Pwer at fllw up interviews, where staff advised that nt all inspectins g cmpleted during review perid had been recrded in DFMS because f Quality Cntrl issues with the ' field captured data and the start-up issues with the new electrnic reprting prcess. Western Pwer prvided data frm the tw ple inspectin cntractrs shwing that 12,44 ples had been inspected * between Nv 09 and Jun 10 and 126,122 ples between Jul 10 and Apr 11. The surce data is the mnthly invice claims fr the tw netwri< cntractrs, which are independently checked by Western Pwer befre payments are prcessed. The ttal number f inspectins reprtedly cmpleted by the > cntractrs during the review perid f 258,565 exceeds the target numbers needed t reduce a backlg. Hwever, the difference between the cntractrs reprted numbers f inspectins (258,565) and that. recrded in DFMS (18,470) indicated that 75,095 ple reprts had nt been laded t DFMS. This is a < significant issue as 29% f inspectins were nt recrded within the distributin asset management <D system (DFMS) during the review perid. The number is far higher than that expected frm a data entry z r quality cntrl prblem. < 61/27017/1107.dcx Asset Management System Review Final Reprt 49