ML19331D083

Final Deficiency Rept Re Power Supplies to Emergency Core Cooling Actuation Sys,Confirming 800618 Telcon.Bechtel Corp Design Drawings Corrected,Deleting Affected Circuits.B&W Corrections & Plant Conformance Expected by 800930

ML19331D083
Person / Time
Site:	Midland
Issue date:	07/17/1980
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML19331D076	List: ML19331D083
References
10CFR-050.55E, 10CFR-50.55E, 9311, NUDOCS 8008270232
Download: ML19331D083 (6)

Text

4,.~'

9 N1dIL

- O- ,# ConSumtrS Power James W Cook Company v.a n,a,. au., ~,n, Geneest Of fices; 1942 West Pernell Ross, Jackson, M.chigan 49201 e (5171788 0640 July 17, 1980 Mr J G Keppler, Regional Directer Office of Inspection & Enforce =ent USNuclear Regulatory Co==ission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 MIDLAND NUCLEAR PLANT UNIT NO 1, DOCKET NO 50-329 UNIT NO 2, DOCKET NO 50-330 POWER SUPPLIES TO INERGENCY CORE COOLING ACTUATION SYSTD! (ECCAS)

FILE: 0.h.9.h0 UFI: 02210 (s) SERIAL: 9311 This letter confirms the 50.55(e) ites concerning the Emergency Core Cooling Actuation System (ECCAS) Digital Subsyste= 2 Logic Circuitry Drawings, repor-ted by telephone call from M J Schaeffer to R Knop, USNRC Region III, Glen Ellyn, IL, and R Cook, USNRC Midland Resident Inspector on June 18, 1980.

The attachments to this letter describe the conditions and actions taken con-cerning this ite=.

This letter is the Final Report on this matter in that the Bechtel design drawings have been corrected. B&W vill have their drawings corrected by September 30, 1980. The ECCAS has not been installed. The only inplace hardware affected consists of three cables, two of which have been ter=inated.

The revised Bechtel Design Drawings deleted these circuits. The Plant will be in conformance by September 30, 1980.

WRB/ bit Attach =ent: 1) Manage =ent Corrective Action Re ort (MCAR-1), Report No 39, dated June 18, 1980

2) MCAR-39, Final Report, Power Supplies to Emergency Core Cooling Actuation System (ECCAS), dated July 7, 1980 CC: Director of Office of Inspection and Enforcement Attn: Mr Victor Stello, USNRC (15)

Director of Office of Manage =ent Information and Progra= Control, USIGC (1)

JUL 2 81980 sooszu 2E l -

4

~

- OUALITY ASSURANCE PROGRAM Attachment 1

.' . MANAGEMENT CURRECTIVE ACTION REPORT

' MCAR 1 3

• REPORT NO.

.- 6/18/80 7220009017 O NO. DATE JOB NO.

l ' DESCRIPTION (int.tuding references):

On Jun2 17, 1980, Project Engineering identified a deficiency on the electrical drawings far tha power supplies to the emergency core cooling actuation system (ECCAS) digital cubsystems. B&W Drawing 02-5264ND-03 (VP 7220-M1.32-6-5) correctly shows vital bus A co tha power supply to digital subsystem 1, but incorrectly shows vital bus C as the powIr cupply for digital subsystem 2. Power Thus, a for vital busses A and C is derived from the loss of off-site power from the common casi Iced group and the same battery.

le:d grcup coincident with a battery failure would result in a loss of powcr to both ECCAS digital subsystems, which is a violation of the single failure criteria of RG 1.53

' RECOMMENDED ACTION (Optionsi)

1. Correct electrical drawings

2. Detarmine impact on other systems listed in B&W Balance of Plant Criteria 36-1G< 4513-00, Section 3.3.3

3. Prapare a written report by 7/2/80, in accordance with NQAM, Sect. V. No.10, Para. 4.1.2 DOA MANAGEMENT O .

REFERRED TO a ENGINEERING O CONSTRUCTION

~

O PROCUREMENT '

ISSUED BY /I #-//-Id

,c,. P,o,.cica- oei.

I NOTIFIED CUENT 6/17/80 11 REPORTABLE DEFICIENCY Dei.

l

" bM

.[f O NO G YES Mt w,f Dete' l -

G CAUSE e

CORRECTIVE ACTION TAKEN AUTHORIZED BY Date STANDARD DISTMBUTION ADDmONAL CRSTRIBUTION AS APPROPRATE FORMAL REPORT TO CLIENT Dow In (if Section 11 Applies) a" .<

En"et E c=r cxus"m oc7o.aIn CORRECTIVE ACTION IMPLEMENTED gyc, . g Pe

? m m e o U "u*a"n N.No"w.en o, oo nUU" VERIFIED BY Proiect OA Engnew Date o e .- _ - - e m an.ans ~

~v..- .

Attachm nt 2 Cuhjeet: McA". 1" (I r.sur"i 6/19/90 Powr Supnlies to rnervency Core Cooline .9ct ust ton Synten (TCCAC)

Final Perort Date: July 7, larn Project: Consu~ers power Company Midland plant finite 1 4 2 Rechtel Job 7??O b.

Introduction:

This report is sub-itted to provide information on the final Pechtel action pursuant to itCAn 30 (CCCAS Power Supplien) .

Dencription of Discrepancy:

Enring the course of review of TU' drawinc 02-5264 "D-03 (v.r. 72?0- 11.3?-6-;)

by acchtel, it was noted that the pocor supply to the FCCAS dief tal subsyste- I is shown from vital bun A and the supply to ECCAS digital subsysten 2 is sho::n fron vital bus C. The drawing also shous s -15 voir control sinnal to ECCAF dir. ital subsystea 2 fro- r.CCAS analog subsysten 3. cubsecuent review.of Pechtel sche .iric 7?20-n-374(Q) revealed the so-c situation. In accordance with the recu're ents or sect. 3.3.3 of EM' halance of plant criteria for plant electric systen (el" docu,ent 36-10o4513-00, V.n. 7?20-?!1.J-1-1) and TSA" fir.ure 7.'-1 (TCCAS block diagra :), the trC/.r. dinital nuksyste,I should he pouered fror -

vital hun A and rCCAS dinital subsysten 2 fron vital bus t. The -15 volt con-trol signal to ECCAS dinital subsysten 7 should he fron F.CCAS analor nuhsysten 2.

Thus, based on the PM.' drawinn and the P.echtel schcratic, a postulated event nasumine a loss of pouer fron the connon load group coincident with a failure of the associated hattery, vould result in a loss of power to both CCCAF dirital subsystens, since both huses /. and C would be lost sicultaneously (see attached figure).

Cause:

The apparent cause of this discrepancy was due to a misinterpretation of the

!!idland plant 120 Vac preferred (vital) power syste , specifically the elec-trical load'groupinp. The '!idland 12n Vac preferred po'rer systee, which powers the ECCAS, is served by a tuo battery schene, where each hattery serves two protection channel huses.

The attached Figure shows the two battery schenc with the correspondinn bus labelinp. and ECCAS dipital subsystem hus assinnments.

Safet" Implient f on:

r,CCAr d i a i t :1 subsyst @ are renponsibic for t rans*i t t in;', actuat inn si:'.nals, in all como,ents g gassociated

%' uitb the crer:'ency core coolin; syste'

("CCF). The identified discrepancv could result in a Inns of power to both E CC?." d i .a.i t e l ruhryete n. Accordier to "U! s sten doncription for EcrAS (v.c. 7 2 2 0-:'1.12

• 6-1 ) , l os s of a vital bus producen a cannot-trip condition in a dinital subsysten. Therefore, the reported deficiency would prevent both manuni an:t automat ic actuation of both ECCAS dinital subsystem channels therehy preventing the r,CCS fron functioning.. This condition is in violation of the sincic failure criterion (reference Penulatory cuide 1.%3).

Corrective Action:

The follovine actions have been taken:

1) The rCCAS supplier, P.M', uns contactci and inforced of the discrepancy (reference: Ecchtel Intter PE"-1452, dated 6/25/RO).

7) EP? concurred with the evaluation and agreed to correct "6" drawinns to show EcCAS dirital subsysten 2 powered fron vital bus P and -15 volt control sinr.a1 fron ErCAS analoc subsyste, 2.

3) Drau i na. chana.c notices correctinn the discrepancy have been issuei for the followin.c electrical drauinr,s:

a) 77?o-C-31(0) DC" ?? dated 6/In/co Panel schedules 6C'; #10 dated 6/le/?.0 panel schedulen b) 7??o-C-32(0) c) 7? p n_r._37 r (c) PC" l2 dated A/2n/PO ECCAS schematic d) 772n-E-37 DC'? P411 dated 6/23/E0 circuit schedule .

rote: nrawine 7220-C-900 (Connection list) will reficct the above channes in the next nonthly revision

4) Other systens listed in P.&" halance of plant criteria 3A-lo04513-90, sect'.in 3.3.3, have been reviewed for sinilar discrepancies.

RPS - Reactor Protection Systen, has four subsystems powered fron vital buses A thru D.

Drawinns reviewed:

Bechtel Dravine No. BMI Dravinc !'o .

Subsysten 1 E-17n(0), Sh 7 DR050136E Subsysten 2 E-370(0), Sh 9 Dn05914Rr.

Subsysten 3 0-37n(0), Sb 8 DR05016nt Subsysten 4 E-370(Q), Sh A D8050172C No discrepancies were found.

-tie:ttn , t' I *iscre nneer era ennciscre* to 1.e I' . iti Lit 1e 19 o' t! ' co n' i a :'e r.i2 e an1.s t i nn s ,

... .. r t ..a on .is.nc r , r, . . . c 00934.3 lY Subiitted by: l hs. ,-

jM Ed Approved by: , C.c L \.) Cb tnc,

/

Conctirrence by:

// 7 f.

Concurrence by:hJf.. S /M fA&tirSoc.l PTC/pjb Attach ent: Tuo "at t ery Tchcae Firtire 9

ATTACHNE NT TO FINAL REFbRT

. JOB 72 20 - MC AR 39

.- DATE D JULY 2. ,19 80 009348 toAo stou r I LOAD csRDOP 2C INY ENV i'N'T IMV 60S A E05 C. 605 B 805 D l

I I

^

If ECCAS-1 ECIAS EffA's- 2.

C PRCSCHT DCSfM) { CDCEcTED DES /GN)

TM)O BATTERY .5cMENG

_ _ _ _ _