ML20127N654

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Responds to NRC Re Deviations Noted in Insp Rept 50-155/92-19.Corrective Actions:Existing Exhaust Fan Will Be Replaced W/Wall Exhaust Fan That Will Meet Flow Requirements to Assure Adequate Ventillation
ML20127N654
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 11/24/1992
From: Beckman W
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9212010352
Download: ML20127N654 (34)
v • d • e


Text

{{#Wiki_filter:- j -i t I i Consumers William L recht 1%nt Manap r l MNROM MEMGAN5 Mt0GRE55 Big Rock Point Nuclear Plant,10269 03 31 North, Charlevoix, MI 49720 November 24, 1992 Nuclear Regulatory Commission Document Control Desk Washington, DC 20555 i DOCKET 50-155 - 1.lCENSE DPR BIG ROCK POINT REPLY 10 a NOTICE Of DEVIATION (NRC INSPECTION REPORT 92-019) i Enclosed is the reply to a Notice of Deviation _ described in the Nuclear i Regulatory Commission Inspectior. Report 50-155/92 019 dated October 30, 1992. I Previously on November 17, 1992, a _ reply to the Notice of Violation described in the same NRC Inspection Report was submitted to the NRC. This latest submittal completes the requirements to respond-to the Notices enclosed in the Inspection Report dated October 30, 1992. t in addition, the Inspection Report addressed a number of open and-unresolved items, and a request was made to address each of these :ltems: alor49 with the reply to the Notices.. After a preliminary review of' these items,. additional time is requested to submit a response. The coordination between on site and off-site groups.to address-these items lends a factor of delay that mi.st be l managed. We therefore respectfully request an extension to the 31st of December,1992, to respond completely to the open and unresolved items addressed in the IIRC-Inspection Report described above. L i l' b 7-WI llam L Beckman a Plant Manager t CC: Administrator, Region 111. USNRC NRC Resident Inspector - Big Rock _ Point i -ATTACHMENTS { 9212010352L921124 -k4 '~ ..[. . i'PE"fN f

i 1 4 i 4 1 1 i 1 1, .i l 1 ATTACHMENT + I Consumers Power Cempany Big Rock Point Plant Docket 50-155 i i i RESPONSE TO NOTICE Of DEVIATION NRC IMSPECTION REPORT 92-019 i i l Novctber 24, 1992 l f l [ i a f b 4 l m I t l { i

J , RESP 0-NSE TO NOTICE Of DEVIATION NRC INSPECTION REPORT-92 019 i DEVIATION j Consumers Power Company, by letter to the NRC dated March 31, 1983, " Big Rock Point Plant - SEP Topic IX-5, Ventilation Systems," committed to install a ventilation system to assure that adequate ventilation was provided in the emergency diesel generator (EDG) room. Contrary to the above, due to an error in calculation EA FC-544-01-02, dated November 24, 1982, the installed ventilation system was undersized and did not assure adequate ventilation of the emergency diesel generator room with the EDG running. REASON FOR THE DEVIATION q 1he calculation used for "Q" (flow, cfm) on page 8 of 9 in EA-FC-544-01-02 used an additional factor of ihr/60 min. This additional conversion factor was an oversight and should net have been used. The use of the additional conversion factor renders the numerical conclusion in the engineering analysis ) inadequate. CORRECTIVE ACTION TAKEN AND RESULTS ACHIEVED Corrective Action A re-evaluation for fan sizing has been performed in EA-RFI-CG-34-01 (attached). An additional evaluation hae also been performed to address the capacity available from alternate ventilation sources for the emergency diesel generator rooni as provided in the Big Rock Point Plant System Operating Procedure (S0P) 25, " Heating and Ventilation System". Summary of Results Achieved The existing exhaust fan will be replaced with a wall exhaust fan that will meet the flow requirements necessary to assure adequate ventilation. it should also be noted that even though the existing exhaust fan is undersized, the capacity provided by alternate ventilation is more than adequate to provide the necessary ventilation for the EDG. ACTIONS TAKEN TO AVOID FURTHER DEVIATIONS Calculational errors are anticipated to be corrected via the technical review process. This incident is an isolated occurrence, and the likelihood of repeating this error is very small. DATE WHEN CORRECTIVE ACTION WILL BE CONPLETED-The corrective action will be completed by the end of-the 1993 Refueling Outage. ~,.. _ _

.. = _. _ t t 4 i ATTACHMENT Consumers Power Company Big Rock Point Plant Docket 50-155 t RESPONSE TO NOTICE OF DEVIATION NRC INSPECTION REPORT 92-019 i EA-RFI-CG-34-01 l i November 24, 1992

~.., e 5 i i i BIG ROCR POINT NUCLEAR PLANT RA-RFI-CG-34-01 ENGINEERING ANALYSIS WORK SHEET SNEET 1 OF 25 d i i TITLE: EMERGENCY DIESEL GENERATOR (EDG) ROOM RE-EVALUATION FOR EXHAUST FAN SIZING AND TOTAL AVAILABLE VENTILATION USING ALTERNATE VENTILATION AS STATED.IN SYSTEM OPERATING j PROCEDURE (SOP) - 25 " HEATING AND VENTILATION SYSTEM" I INITIATION AND REVIEW INITIATED REVIEW TECHNICAL i HETHOD () REVIEW 4 l REV DESCRIPTION ALT DET QUAL BY DATE CALC RVW TEST BY DATE O ORIGINAL ISSUE g oj / [ g / i l' QDE CTIVE ) This evaluation is being performed to correct the numerical errors ~ noticed regarding the adequacy of the emergency diesel generator room exhaust fan sizing as identified by the USNRC, Electrical Distribution System Functional Inspection (EDSFI) at the Big Rock i Point Plant, via Request For Information (RFI)ill-also be done toNumber CG-34, dated August 31, 1992. In addition, an evaluation w address the capacity available from alternate ventilation for the emergency diesel generator room as provided in the Big Rock Point Plant, System Operating Procedure (SOP)-25. RRFIEXECEA i 1. Facilit Change - 544, Emergency Diesel Generator Room l Ventila ion 4 2. Consumers Power Letter to.USNRC,. Dated June 11,1982 3. USNRC Letter to Consumers Power, Dated October 12, 1982 4 Big Rock Point Alarm Procedure, ' ALP.1.12 i 5.- Big Rock Point System Operating Procedure, SOP-25 l a

- _ ~ - -= -- 1 4 i ENGINEERING ANALYSIS EA-RFI-CO-34-01 i i CONTINUATION SHEET SHEET 2 0F 25 j 6. USNRC Request For Information, RFI No. BS-04 7. USNRC Request For Information, RFI No. CG-04 ) 8. USNRC Request For Information, RFI No. CG-10 9. USNRC Request For Information, RFI No. CG-11 10. ASilRAE Handbook,1981 rundamentals { 11. Big Rock Point Maintenance Order No. 83-EPS-0217 i ] ATTACRMENIA ) 1. Telecon, dated September 3, 1992, from TSikavitsas to H DPlellegata, Michlgan Tractor & Machinery Co., Caterpillar j Dealer 2. Catalog cuts neet for Dynamaster Fan, Model FQ16H4 3. Telecon, dated September 9, 1992, from TSikavitsas to DKahlbaum, CPCo Environmental Department i AD_UMF_TIQEt 1. Below is the original design basis for the Eneraency Diesel Generator Room thermostatic controlled ventilatton system as evaluated in Facility Change (FC) - 544 (Reference 1). l " The failure of the Energency Diesel Generator (EDG) I ventilation system will not jeopardize the ability of the EDG's operability. From an evaluation by Consumers Power Company for SEP Topic IX-5, for Big Rock Point (Reference 3 it was determined that the heat rise from the EDG will)not impair its t 07eration. The recommendation is to establish a procedure in (Vol 3 i.e. SOP's) to provide adequate ventilation by means of opening, ion (Reference 4)d the access doors to the room. In addition, the NRC ( evaluat also states that a procedure be established to provide a equate vantilation for the room if the EDG is required to operate for extended duration. Our main commitment to the NRC is to provide procedural control for t ventilating the room. The' installation of a thermostatic controlled vent system is to help alleviate subsequent operator action and also alleviate l the placement of additional security personnel. Procedures will be drafted (Reference 5) to assure that the vent-system act.ivates- (at its set-point)ically by making of the automatically. However, if it does not activate automat thermostat, manual activation is provided.- In addition, if the Rev 0 l L i

W M ENGINEERING ANALYSI8 EA-RFI-CO-34-01 CONTINUATION 8HEET SHEET 3 OF 25 vent system becomes completely disableC than operator action will be to open doors to the room and security will be posted. The EDG has a passive ventilation system and the addition of a thermostatic controlled vont system is merely to aid in venting the room adequately." 2. From Referenco 6 and Reference 12, it has been stated that the related (NSR and non-Q-EDG ventilation is non-safetyis conclusion)is based on the fact classified. The basis for th that failure of the thermostatically-controlled ventilation system will not render the EDG inoperable sinco alternato ventilation is provided by opening of the room doors. The original analysis in Reference 1 did not consider the ventilating capaclty of the open doorn. Access heat removal capacity provided by this alternato ventilating means will be evaluated to substantiato procedural compliance. 3. IA-FC-544-01-02 did not take credit for insulation provided on the EDG steel exhaust piping and mufflor. The heat gain assumed from an exposed EDG exhaust system piping is overly conservative. This evaluation will consider the use of the calcium silicate insulation provided in determining heat gain for the EDG room. 4. Values for heat (BTU /hr) radiated by the dicsol engine and heat dissipated (BTU /hr) for the D-343 generator.by the generator were obtained from Caterpillar Dealer Leo Attachment 1. 5. EA-FC-544-01-02 did not consider combustion air intake flow would help in requirements. Intake flow requirements (cfm) ion will consider removing heat from the room. This re-evaluat the sinc.ificant contribution that intake flow provides for heat removal. Intake air will uso a 10' F temperature dif ference. 6. Summer conditions will be considered for heat loss and average wind velocities for alternate ventilation method. 7. EDG Room inside temperature estimated at 140*F with outsidc temperature at 85'F. 8. The value for the air inlet velocity coef ficient for ef fective opening in determining alternato ventilation flow will be assumed to be at 0.4. 9. The west wall of the EDG room is the division between it and-the screenhouse pump room. Inside temperature fo; the pump room will also be assumed to be at 85'F. 10. In determining heat gain to the EDG room through the exhaust system insulation insido room air temp will be assumed to be at 80*F. This will give a higher value for heat gain. Rev 0

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3 i aaa a.. e 4.s* e q 0 . ~. _ e*. ) EA-RFI-CG-34 01 ENGINEERING ANALYSIS SHEET 23-OF 35 l CONTINUATION SHEET 1 TJAtt_hTION;.9F_ MTXREATE vet!IEATION U .PROVIDED_.PY O_PENING DOORS The wisting ventilation fan (F-32) is undernized due to the-However, the EDG room is numerical error in EA-FC-544-01-02. previded with a room high temperature alarm via temperature switch The switch is located on the side of the north end panel _ of TS-9701. control cabinet C-18. It will activate at 115*F and rising, ion is and Local indicat j annunciate in the control room (Reference 4). l also provided. If the EDG is run for outended periods with the ventilation f an runnirg and toom temperature increasing, TS-970*1 will activate and The operator responsa in to operators will be required to resptnd. open the doors as required by Reference 5. E TERNATE VENTILATlQ1L.11Ql( l O=C xAx( REF 10, CHPT 22, y EQ-9 h Cy = EFFECTIVENESS OF OPENING COEFFICIENT =.4 - See Assumption 8 I A = DOOR OPENING (?'- 4 7./2" x 7'- 2 1/2") = 24.25 SQ FT l V = WIND VELOCITY REF ATTACHMENT 3 = 12.6 MPH (1109 FT/ MIN) I ILQTE.;. The above referenced equation is used in designing natural ventilation sfstems. It is also used to determine the air forced through openings due to wind. Summer. wind velocities will be used since they ' tend to be lower than the other seasons. From Reference 10,- the average seasonal sind-velocity.is of ten reduced by a - f ar, tor of 2. Since tha extended use of the EDG has z. low probability, in our application we will take full .) credit of average summe'. wind velocities. 1 Q = Cy x A X [ =.4 x 24.25 sq f t x 1109 ' f t/ min Q = 10,757-CFM i 4 i Rev 0 i J EA-RPI-CG-34-01 ENGINEERING ANALYSIS SHEET 24 OF 25 CONTINUATION SREET ELECTRICAL _gyhtdLAI_IQ1LIOR PROPOSEpE RRf1ACEtiqNJ 1. LOADS ON THE SECONDARY SIDE OF THE TRANSFORMER A. 3/4 HP, 120 VAC, SINGLE PHASE MOTOR - FROM NEC ARTICLE 430, i TABLE 430-148, USE 13.8 AMPS f B. DAMPER MOTOR, 120 VAC, SINGLE PHASE, INRUSH 75 VA, HOLDING 25 VA, USE 75 VA (UNCHANGED FROM ORIGINAL LOADS) i 2. FIND REQUIRED KVA FOR SIZING TRANSFORMER: AXV KVA =. I 1000 1 4 13.8 x 120 3/4 HP MOTOR = = 1.65 KVA SAY 1.7 KVA 1000 h i i 75 VA DAMPER MOTOR = - - =. 07 5 KV A 1000. TOTAL KVA = 1.7 +.075 = 2.0 KVA i-i 3. FUSE SELECTION - BASED CN NEC ARTICLE 450-3 (b) (2) SECONDARY SIDE FUSE SHALL NOT EXCEED 125% OF RATED TRANSFORMER SECONDARY CURRENT. l 1 2 KVA / 120-V = 16.66 AMPS 2 125% x 16.66'= 20.8 AMPS THEREFOR USC 20 AMP FUSE PRIMARY SIDE NOT TO LXCEED 250% f If = 2 KVA /-480 V = 4.17 AMP 4 4.17 x 250% = 10.42 AMP-THEREFOR USE 10 AMP FUSE See Figure --1-for a diagram depicting-the.abc"e changes i 1 5 1 Rev 0 i -s ,r a v.

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RA-RFI-CG-34-01 ENGINEERING ANALYSIS SHEET 25 OF 25 CONTINUATION SHEET EMQMMEEpM9ER since the original calculation for exhanst fan sizing is inadequate, it is being recommended that the existing exhaust fan be replaced with a f an having a capacity e.n stated in this re-evaluation. thir, could be From inspection of existin't design dcau nents,ing :.nstalled-system. accomplished with minimal impact on tha exist The following would require upgrading. Replace existing exhaust Fan (F-32), with a 3/4 hp, 12C vac, 1 1. See Attachment phase,-3710 cfm wall exhaust fan. The primary side fuse protection (2 amp) to the control 2. transformer would have to be increased. The preliminary indication would be to ute a 10 amp fuse. The fuse block is rated at 30 amp and does not require changing. See EA-RFI-CG-34-01, page 24. 'Ito existing 1.0 kva transformer would require upgrading to a 3. 2.0 kva 480/120 vac. See EA-RFI-CG-3 4-01, - page -24. e The secondary side fuse protection (6 amp at 120vac) would have-4. to be increased to at least 20 amp. The existing fuse block has capacity to 30 6mp and is adequate. See-EA-RFI-CG-34-01, page 24. The existing power and control wiring has ample capacity to 5. accommodate the new fan and existing motor damper and does not need to be-replaced. l 6. Revise SOP-25, Section 6.6 and 6.6.1 to more accurately clarify the intent of the alternate ventilation for the EDG Room. it ohould' be noted: e <en .Along with the changes recommended above,ized, the capacity provided though the existing exhaust fan is unders l by the alternate ventilation has-more than -adequate capacity to providn' the necessary ventilation for - the - EDG. t i l l 1 i Rev 0 l 1 i L. m m es too wa T S,6,r.sAs un. Se g, e ws e a. ( 1331 m. to m A.y @r** h 94t.t.eGATA Pas B IS - 397 7 o50 M,c.u.c. a._ b rna ! M e,~ s,.v Co Greo,<ue Deuea3 or l N o v ;_. M i e " ' 6 ^ N c try. smit nnum xmnenos. Reno es ve 8 h 4 Fo a. M A t t o N kUWD Wh. by h e in.T o R-D -34 3. twwt Ac~esATo n. ET R e a o e,r F.nw Mc P. e u x o u.e. W Fout o m m,f

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'It up to 1" static pressure with ca' Avaltablein10 shes.9"thruG6"with ecicas - m e N wepo*cim ia dei.es e I pacities to 35.930 CFM. Avallable in a maximum capacity of 17.800 CFM-tal to" eo,7,t e. a e,v, emis a eusw ance 3 site 3,14" thru 46" those heavy o "y fans are desi ned for industrial Fan panets are constructed of steel 0 e applications when: extra r,trength and range from 18 to 18 gauge. L r* s en A.w.4 mra co-,< woi in er '.d durability are des' red. Aluminum blado thickness is from $ _ i..,y i,,,,,,,,,,,3,,,,y,,t,, . Fan panets are constructed of steet.000 to.125. na r-wa ce,tmo seona mene sca s enuse vid range from 10 to ld gauge. insusen st MJminum DIME thiChroSSISIrom.000 ADVANCED PROPEL.LER DES)GN

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% Accia ovueaov, are is:vd l These propellers feature an ad-tv rw cawen swen Ames i HIGH PRESSURE P80 PELT ERS vanced teer-drop shape blade de-scon teireis taoorsvr aine eed y i 1 signed for exceptionalty low noise l i i for n,reawd oressure requirements level performance. i I FN propetters. depending on size i ar$d horsepower, have four or six. Aiurninum blades are lastened to a l tapered, circu'ar-arc airfoil biades formed steel hub with heavy duty i l S*.andard construction is a!! welded oversize rivets. propeller is creci-i crirves 1990 tn 4,r4 Eve *,rq s Menweuvis orp. c j 3 AA riews iese rved i .a nn - m r. 1DyncMaster Performanco gg 7e Crid es 51A7C PM13@t FAs FMI $ttfD IAU $ 4.7 ITP( MIG tru fVue W $DNE3 000" 10i7' .125 " 2'.E ' 3M" $00 A25 ' .714 ' Un* 1.000 ~ RP WT. 3rfv1'Ut 10det0 1ND 3433 b 8 G 356 15 Ot' fvDe 1640 3710 10 ED 410 18 0 1)0 85 } Sc F01(al0 15CD 39:'S 6 620 s3) 2 'd i So FolC8HI 1650 ___ 4310 6 686 trt

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