ML20062J439

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Forwards Info Re Carbon Dioxide Sys Design Adequacy,To Expedite Resolution of Generic Technical Concerns Originally Discussed in .Discrepancy Re Util Position on Carbon Dioxide Test Was Resolved During 801002 & 14 Telcons
ML20062J439
Person / Time
Site: Pilgrim
Issue date: 10/20/1980
From: Morisi A
BOSTON EDISON CO.
To: Ippolito T
Office of Nuclear Reactor Regulation
References
80-259, NUDOCS 8010270316
Download: ML20062J439 (8)
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Text

{{#Wiki_filter:, BOSTON EntsON COMPANY ornamat arrica. som mort.,o= 5,asc, ....ou..........om, ^1N=l NUCLEAR c PERATioNE SUPPrtRT oEPARTM ENT October 20, 1980 BECo. Ltr. #80-259 Mr. Thomas A. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, D. C. 20555 License No. DPR-35 Docket No. 50-293 C02 System Discharge Test Pilgrim Nuclear Power Station Unit #1 References (a) BECo Letter #80-38 dated 2/29/80 G. C. Andognini (BECo) to T. A. Ippolito (NRC) (b) NRC Letter TAC #11077 dated 10-7-80, T. A. Ippolito (NRC) to A. Victor Morisi ',BECo) (c) Telecon conversation between J. D. Keyes, T. A. Venkataraman (BECo) and M. Willaims, T. Elexion (NRC) on 10-2-80 (d) Telecon conversation between J. D. Keyes, T. A. Venkataraman (BECo) and M. Williams, 5 Scott Hudson, T. Elexion (NRC) on 10-14-80 j

Dear Sir:

In Reference (a) Boston Edison Company presented the generic technical concerns it had regarding the perfonnance of a full scale C02 Discharge Test in the cable spreading room and requested NRC resolution of these concerns prior to committing to conduct the test. Reference (b) was the first correspondence BECo received which discussed the C02 Discharge Test. However, Enclosure 1 to Reference (b) addressed a Boston Edison request for postponement of the CO Refueling Outage, while Enclosure 2 to Reference (2) test performance until the 1981 b listed the status of the CO2 Test as completed (Item 3.2.8). l This apparent discrepancy concerning Boston Edison's cosition on the C02 test was resolved during conference calls between members of your staff and ours (References (c) & (d)). It was agreed that BECo's position was as presented in Reference (a) and quoted above. It was aiso agreed durinJ these discussions that in an effort to THIS DOCUMENT CONTAINS 80102703N/ [ P00R QUAUTY PAGES

COOTON EDICON COMPANY i. Mr. Thomas A. Ippolite, Chief October 20, 1980 Page 2 expedite final resolution of this issue, we would provide you with a copy of our previous submittal which specified the C02 system design adequacy. A copy of this letter along with the calculations which support the system adequacy are included as attacnments to this letter. We trust this information is responsive to your needs, however, should you require any additional information please do not hesitate to contact us. Very truly yours, ' (., lGr l 'Enn (( 4 Attachments 1 A - BECo Letter 78-135 (0-15) B - CO2 System Calculations

Attachment A W Q15 Evaluate the consequences of a design basis fire in the cable spreading room. Provide an analysis which shows the effectiveness and reliability of the present C03 system. State the CO2 density (as a fraction of time) at the height of lihe upper most cable trays considering air leakage through door - ways and ducts. Show that fire brigade operations could not adversely affect extinguishment of fire by the CO2 system. It is the staff's position that an automatically initiated CO, system is acceptable for the cable spreading room as primary fire suppression provided a fixed water system in used as 'a backup. (A 3TP APCSB 9.5-1 Section F3b (3)). Describe your proposed design modification to meet the above position or juscify noncompliance. 3ECo RESPONSE The carbon dioxide suppression system in the cable spreading room is designed to discharge at a rate of 80 pounds per minute threugi; each of the 15 nozzles in the room for a total discharge of 1200 pounds cer ninute. It takes approxi= ate].y 2 minute and 20 seconds to totally flood the CSR, requiring 2800 L3 of CO e provide a 50'; design 2 concentration. At a discharge rate of 1200 pounds per minute, the highest cable tray in the room will be covered with the design concentration of CO in slightly over 2 minutes. The origindi design calculations 2 allow for a loss of at least 270 pounds of CO due to leakage. 2 Recent tests of the installed rate of rise heat detectors in the CSR showed that the C03 system responded in 20 seconds from the time the heat was applied. 'The response time of these detectors to an actual fire in the CSR will vary with the severity of the fire. In addition to a the race of rise detectors, the CSR is also equipped with ionization detectors for early warning. Ad.ninistrative procedures call for immediate visual inspection of the CSR and if the CO system has not activated i 3 automatically it is to be manually tripped! The reliability of CO2 systems has been found to be 96.1% effective as determined by U. S. Navy evaluation reported in an article " Reliability of yire Protection Systems" by M. J. Miller (Chemical Engineering Progress, April 19 74). Administrative procedures require that the fire brigade enter the CSR with breathing apparatus to determine that there are no human occupants present and also to observe if the fire has been extinguished. If the fire has not been extinguished or rekindles, the low-pressure C03 storage tank has the capa:ity for a second shot which is activated by the fire brigade. In addition to fire brigade operations, the Plymouth Fire Departmer.c is also notified. The Fire Department has a normal response time of 6 =inutes or less l Their professional experience will assist in extinguishing the fire. A fixed water system is available outside the cable spreading room as a back up to the total flooding carbon dioxide system. No design =odification is required for this area. t I ~, -.,.

DevlSION CF CHEMETRON C OR POR ATIO rd Attachment B Law Pensure Carb:n Dionida Flow Calculstiens C A' '.. S H E F T._/_or b-4 ' ' '# /C /3 #d (8. SYST EM FOR PJL 8FA ry1 SF/1DD& SY d*U*A-DAt t - plans n.me 4...... AZARD $AElf MPPfA D PMM PROPOSAL NO. JOB NO. A~/$$AE c.-wie.t 4 m.ee r..e DRAWING NO. b / <~4 A "I INSURANCE REF. NO. Effective Desig. Lbs. CO2 Sterose Discharge Flow Ro e b HAZARD EFFECTIVE DISCHARGE PERIOD. DESIGN FLOW RATE Period ite.per s Wdl AND STORAGE REQUIREMENT (in .c.nd.) TOTAL FLOODING (TF)- Requirement is8868 lbs.CO2 /I //8-Vopor discharge period and vepor discharge. / 3 f *' #2## : 87# 0 Ef fective discharge period. design flow rate and storage. /S2 /ye a 26/2 Total Discharge Period. Design Flow Rote and Storage...... LCCAL APPLICATION (L A) Minimum effective discharge period-30 seconds.. Plus high temperature condition................... Plus other. l a' Ef fective discharge period. design flow rate and storage 'M Vapor discharge period and vapor discharge... L Tc'e' Deoga Pe iod. Doign Flow Rote and Sforoge. COMBINED LOCAL APPLICATION & TOTAL FLOODING (from L A ond T F figu es. bow.) r local opplication design flow rote,. Toto! flooding design flow rote....... Total Hozord Desa F % P-+a EXTENDED DISCHARGE I -1 ) o' Initial Dischorse Period and Design Flow Rote. a' Extended Dischorge Period and Design Flow Rote. /5s /2#o 26/2_ FINAL DISCHARGE PERIOD, DESIGN FLOW RATE AND STORAGE. LOW PRESSURE STORAGE:dton for 8 +T shot protection. = REMARKS; S S C HMfWE/1Y/0W WIA A EE WAlhWD NA ~ AAP/20% /$2 JJ/A4 Y ~ h _ r=hl a N AJu!G

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SUMMARY

OF PIPE WEIGHT AND VOLUME SCHEDULE 80 PIPP. SCHEDULE 40 PIPE NOMINAL PEET OF WElGHT WEIGHT YOLUME YOLUME NOMINAL PEET OP WEIGHT WEpOMT VOLUME v0LUME g 8 PIPE PIPE OF PIPE TOTALS OF PIPE TOTALS PIPE MPE OF PIPE TOTALS OF PIPE TOTALS 882E lbs per ft. emit perft. SIZE Ibs.per h. cm it. per N. 6 28.37 181 6 18.97 .301 5 20.7s .126 5 14.42 .139 4 14.98 .0a 4 10.79 .008 l as ,2.3 02 as .068 3 /C 10.25 // 2.5 .046 , 440 3 7.5 s .05 2h 7.66 .029 2 '# /// 5.79 g-C 033 5.4/J.i 2 i 2 5.02 ,021 2 3.65 023 ,' f Ih 3.63 .u u 8.D' . 010 ,2:* 1 I 1 /s 3.0 .009 1 /s 2 2.27 I 2.17 .005 1 g/) 1.68 h[ .006 , f. ' Zg 4.la g '4 1.47 .003

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