ML19330A730

Final Deficiency Rept Re Emergency Core Cooling Actuation Sys Digital Subsystem 2 Logic Circuitry Drawings.B&W Will Correct Drawings by 800930.Facilities Will Be in Conformance by 800930

ML19330A730
Person / Time
Site:	Midland
Issue date:	07/17/1980
From:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
References
NUDOCS 8007290206
Download: ML19330A730 (5)

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Consumers James W Cook Vsce President, Midland Project l

General of fices: 1945 West Parnalt Road, Jackson, Michigan 49201 (517) 788-0640

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July 17, 1980 Mr J G Keppler, Regional Director -

Office of Inspection & Enforcement USNuclear Regulatory Commission 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 EMERGENCY CORE COOLING ACTUATION SYSTEM (ECCAS)

FILE: 0.h.9.40 UFI: 02210 (s) SERIAL: 9311 This letter confirms the 50.55(e) item concerning the Emergency Core Cooling Actuation System (ECCAS) Digital Subsystem 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 Renident Inspector on June 18, 1980.

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

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

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

dsea hl Dok WRB/blt

Attachment:

1) Management Corrective Action Report (MCAR-1), Report No 39, dated June 18, 1980

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

Director of Office of Management Information and Frogram Centrol, ll::tillC (1)

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THIS DOCUMENT CONTAINS POOR QUAllTY PAGES 8007290 g 3

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OUALITY ASSURANCE PROGRAM Attachment 1

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MANAGEMENT CORRECTIVE ACTION REPORT MCAR-1 j REPORT NO.

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

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• DESCRIPTION (Including references): I On Juna 17, 1980 Project Engineering identified a deficiency on the electrical drawings tr tha powe- supplies to the emergency core cooling actuation system (ECCAS) digital cubryst;ms B&W Drawing 02-5264ND-03 (VP 7220-M1.32-6-5) correctly shows vital bus A Ja the power supply to digital subsystem 1, but intorrectly shows vital bus C as the Pow;r eupply for digital subsystem 2. Power for vital busses A and C is derived from the Dam 2 lord group and the same battery. Thus, a loss of off-site power from the common Bccd grsup coincident with a battery failure would result in a loss of power to both JCCAS digital subsystems, which is a violation of the singic failure criteria of RG 1.53

• RECOMMENDED ACTION (Optional)

1. Correct electrical drawings

2. Determine impact on other systems listed in B&W Balance of Plant criteria 36-1004513-00, Section 3.3.3

3. Prepare a written report by 7/2/80, in accordance with NQAM, Sect. V, No.10, Para. 4.1.2 Ot ENGINEERING O CONSTRUCTION OOA MANAGEMENT O REFERRED TO

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10 PROCUREMENT ~ '

ISSUED BY /2I - . #-/E-/C p ProjeCtCREngineer ' Data I NOTIFIED CUENT 6/17/80 11 REPORTABLE DEFICIENCY Date l

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CORRECTIVE ACTION TAKEN

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AUTHORIZED BY Date STANDARD DISTRIBUTION ADDmONAL DISTRIBUTION AS APPROPRIATE FORMAL REPORT TO CLIENT

" Date ER $f07tE> 'rYtCtE7" nun"

P (if Section II Applies)

(#D OA u AN AGf R AAO PROCURf M[NT SUPPUER OUAUTY MGR EAPD01MIM GER CONSTRUC1ON M AN AGE R AAO 04M/ NAGER Pfal SUPY 4HOJ CONST R M ANAGER PRO.EC1 M AN AGER CteEF CONSTR OC ENGlNEER CEE N1 PF OCE CORRECTIVE ACTION IMPLEMENTED AAO PROJECT OPf RATONS MANAGER DrvtsaOr4 FROCURTMENT MGrt Aa0 PRCCURIME M1 M ANAGER PROJ FROCUREMENT MGR AAO uaR cr rNGararuNG tw sVPrurR OuAury uGn AAO M3R OF CONSTRUCTION VERIFIED BY ProseCt O A Engineer Date u..cre. m .w. % .no en=$ ,.e ne. exam.,e

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Cubject: MCAS 19 (Issued 6/19/90 "over Supplies to rnery.ency Core Cooling Actuotton Systen (FCCAS)

Final peport Date: July 7, 19fo Project: Consuners Pouer Company Midland plant Units 15 2 Rechtel Joh 7220

Introduction:

This report is submitted to provide information on the final Bechtel action pursuant to ifCAR 30 (CCCAS Power Supplies).

Description of Discrepancy:

Durinn the course of review of P&F drawing 02-5264 !D-03 (v.p . 7 2?O-M1.3?-6-;) I by Bechtel, it was noted that the pouor supply to the FCCAS dinital subsystem is shown fron vital bus A and the supply to ECCAS digital subsysten 2 is shour fron vital bus C. The drawing also shous a -15 volt control signal to ECCAF Subsequent review of rechtel digita] subsysten 2 fron F.CCAS analog subsysten 3.

schematic 7?20-n-37a(C) revealed the sanc situation. In accordance with the recuirements or sect. 3.3.3 of EM? balance of plat.t criteria for plant electric systen (PL'? document 36-1004513-00, V .n. 7?20-!11.J-1-1) and TSAR finure 7.7-1 (ECCAS block diagran), the ErCAO dinital nuhsysten 1 should be povered f ron vital bus A and ECCAS digital subsysten 2 fron vital bus B. The -15 volt con-trol signal to ECCAS digital subsysten 2 should be fron F.CCAS analog subsysten 2.

Thus, based on the PM? drawing and the techte) schenatic, a postulated failure event nasuning a -loss of pouer f ron the connon load c,roup coincident with a of the associated hattery, would result in a loss of power to both CCCAF dicital subsystens, since both huses /. and C would be lost simultaneously (see attached figure).

Cause:

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

!!idland plant 120 Vac preferred (vital) power system, specifically which the elec-t rical _. load' grouping. The Midland 120 Vac preferred po'rer syste::,

powers the ECCAS,_is served by a tuo battery schene, where each battery seru s tuo protection channel huses.

The attached Figure shows the two battery schene with the corresponding hus labeling and ECCAS d.icital cubsysten bus assinnments.

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ATTACHME NT TO FINAL TWPo T

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