ML19330A730
| 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) | |
Text
S h
Consumers James W Cook s..
l Vsce President, Midland Project General of fices: 1945 West Parnalt Road, Jackson, Michigan 49201 (517) 788-0640 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.
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)
THIS DOCUMENT CONTAINS POOR QUAllTY PAGES 8007290 g
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OUALITY ASSURANCE PROGRAM MANAGEMENT CORRECTIVE ACTION REPORT MCAR-1 j
3" REPORT NO.
6/18/80 7220009017 O NO.
DATE __
JOB NO.
I
- DESCRIPTION (Including references):
I Project Engineering identified a deficiency on the electrical drawings On Juna 17, 1980 tr tha powe-supplies to the emergency core cooling actuation system (ECCAS) digital 02-5264ND-03 (VP 7220-M1.32-6-5) correctly shows vital bus A cubryst;ms B&W Drawing 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 36-1004513-2.
Determine impact on other systems listed in B&W Balance of Plant criteria 00, Section 3.3.3 Prepare a written report by 7/2/80, in accordance with NQAM, Sect. V, No.10, Para. 4.1.2 3.
REFERRED TO Ot ENGINEERING O CONSTRUCTION OOA MANAGEMENT O
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10 PROCUREMENT ISSUED BY /2I
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CORRECTIVE ACTION TAKEN AUTHORIZED BY Date STANDARD DISTRIBUTION ADDmONAL DISTRIBUTION AS APPROPRIATE FORMAL REPORT TO CLIENT ER $f07tE>
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AttachnB W 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:==
is submitted to provide information on the final Bechtel action This report 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 it was noted that the pouor supply to the FCCAS dinital subsystem by Bechtel,fron vital bus A and the supply to ECCAS digital subsysten 2 is shour is shown fron vital bus C.
The drawing also shous a -15 volt control signal to ECCAF digita] subsysten 2 fron F.CCAS analog subsysten 3.
Subsequent review of rechtel 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 36-1004513-00, V.n. 7?20-!11.J-1-1) and TSAR finure 7.7-1 systen (PL'? document (ECCAS block diagran), the ErCAO dinital nuhsysten 1 should be povered f ron The -15 volt con-vital bus A and ECCAS digital subsysten 2 fron vital bus B.
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 event failure 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:
cause of this discrepancy was due to a misinterpretation of the The apparent
!!idland plant 120 Vac preferred (vital) power system, specifically the elec-which 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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