ML19323H321

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Forwards Evaluation of Battery Room Ventilation Sys Which Exhausts Into Control Room.Neither Hydrogen Accumulation Nor Loss of Battery Electrolyte Will Pose Safety Hazard or Control Room Habitability Problem
ML19323H321
Person / Time
Site: North Anna Dominion icon.png
Issue date: 06/10/1980
From: Sylvia B
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To: Harold Denton, Youngblood B
Office of Nuclear Reactor Regulation
References
NUDOCS 8006120378
Download: ML19323H321 (9)
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Text

{{#Wiki_filter:! VIHOINIA ELECTRIC AN D POW Elf COkt 1% NY = n rcur><oun,vinom1A canal June 10, 1980 Mr. Harold R. Denton, Director Serial No. 504 Office of Nuclear Reactor Regulation LQA/ESG:rab Attn: Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Docket No. 50-339 Division of Licensing License No. NPF-7 U. S. Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Denton:

In accordance with North Anna Unit 2 Operating License. Condition 2.D(7), an evaluation has been performed of the battery room ventilation system which exhausts into one end of the control room. The results of this evaluation are attached. Based on this evaluation, it has been concluded that neither hydrogen accumulation nor a loss of battery electrolyte will pose a safety hazard or control room habitability problem. Very truly yours, NAS/O B. R. Sylvia Manager-Nuclear Operations and Maintenance Attachment THIS DOCUMENT CONTAINS P00R QUALITY PAGES 8006120 391 [

t 's - 'r e r' BATTERY ROOM VENTILATION SYSTEM EVALUATION There are eight battery rooms serving North Anna Units 1 and 2. Four are located directly above the control room at cl. 294 ft-0 in (see Figure 1) and four are located below the control room in the emergency switchgear and relay rooms at el. 254 f t-0 in (see Figures 2 and 3). This evaluation is for the ventilation. system for the battery rooms located above the control room which exhaust into the control roca. The four battery rooms at el. 254 f t-0 in are cooled and ventilated through supply and return air outlets located in the ceiling of the battery rooms which is below the control room floor elevation. These ceiling outlets lead to the emergency switchgear and relay' rooms. The four battery rooms at el. 294 ft-0 in are cooled and ventilated through. k supply aad return air outlets located in the floor of each battery room. These floor openings lead into the control room ceiling space forming an air path created by the battery room exhaust fa.. Each battery room is furnished with an exhaust fan to provide mechanical ventilation through the supply and return outlets. The ventilation system for the battery rooms at el. 294 ft-0 in is desiga'ed to provide rapid air change and turbulent air flow to assure diffusion of hydrogen. To verify the air motion throughout the battery rooms, air traverse readings were conducted and recorded in Supplement No. 3, dated October -1,1978 to the Fire Protection rystem Review based on Appendix A to the ' Branch Technical Position APCSB 9.5-1. The air traverse readings were as follows: m

4' = -l. - Floor level (3 in above ' floor) 18 to 23 fpm 2. Mid-height (5 f t above floor) -- 47-61 fp2 3. Ceiling (3 in below ceiling) 60 fpo J NOTE: To reduce noise levels in the main control room, silencers were added to the battery roca supply and ' exhaust ducts which resulted in extending these ducts closet to the ceiling. This modification is consistent with the NRC Coment 6.a in Supplement No. 3 of the Fire Protection Review discussed above. Air traverse readings were repeated and are as follows: 1. 1-10 fpm 2. 11-1 fpm i 3. 30-35 fpm 1 It is erident that hydrogen,- which will dispe~rse and readily mix with air due to its low density, will not accumulate in the battery rocas under either of these conditions due to the constant air mover.:ent at all-levels. Maximum hydrogen evolution occurs during the performance of a battery .' equalizing charge. Minimum hydrogen is produced during float charging operations. - During the equalizing charge the batteries in each battery . room willl generate approximately 10.4 cu f t of hydrogen per 24 hr period. a P X 2- 'em,- , e-e w -e v- <n4r

,6 at r Since the volume of the air in each battery room is replaced at least 50 times per hour, hydrogen will not accumulate and will be dispersed to and throughout the main control roca. Hydrogen has a specific gravity of 0.0695 (air = 1.0) and will diffuse rapidly in air. The normal control room supply and exhaust system described in the FSAR, Section 9.4.1, provides the ventilation rates required for confort control and dilution. With the air motion in each battery room as well as in the control room, hydrogen will diffuse and mix rapidly and then be discharged to the environs. Therefore, hydrogen will not accumulate in these spaces. No adverse health results are expected due to exhausting hydrogen to the control room, since hydrogen has no acute toxic effects as stated in " Dangerous Properties of Industrial Materials" by Irving Sax (1957). Additionally, each battery room fan is c:onitored as discussed in the response to the NRC comment 6.b of Supplement 3 of the Fire Protection Systen Review so that upon a loss of ventilation and subsequent alarm the control room operator will stop the ~ equalizing charge and prevent the further evolution of hydrogen. As discussed in the FSAR, Section 6.4, the control room pressure envelope, which includes the battery rooms, is isolated when the bottled air breathing system is actuated by an SIS signal. The redundant safety-related control. room and emergency switchgear and relay room ventilating systems will operate continuously ensuring thorough diffusion of released hydrogen af ter SIS initiation. In view of the above, if it is conservatively assumed that all eight battery installations are undergoing an equalizing charge and ~ generating the maximum amount of hydrogen with the control room pressure

c. telope isolated, and failure of one redundant ventilation train, it will take approximately-1,200 hours (50 days) and approximately 2,900 hrs (120 days) i

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1 p,, O' for the control room and the caergency switchgear and relay rooms, respectively, to reach 2 percent hydrogen concentration, which is well below the lower lirait of th: 4.1 to 74.2 percent explosive range as stated in " Dangerous Properties of Industrial Materials" by Irving Sax (1957). Since the control rec.t pressure envelope will only be isolated for one hour af ter an 5IS si;;al, it can be deterained from the above tha t hydrogen accumulation is ninical and does not represent a safety hr.zard. 5 N

f: C i ADDENDUM NO. 1 BATTERY ROOM VENTILATION SYS'i".M EVALUATION Also, an assess = ant was =w of the potential for contanination of the control roca environnent with sulfuric acid vapor resulting from the rupture of a battery case in one battery room at el 294 f t-o in. All the batteries and supporting racks are seisnically qualified, and an acid spill is not expected. However, for this review, the largest single batta y cell containing 67 lb of 30 percent concentration of sulfuric acid was assuced to rupture and spill its entire contents across the bactery roon floor. Concrete curbs are provided at the ventilation openings which will prevent the electrolyte from dropping into the ccatrol roon below. The battery room ventilation was assumed j to remain operational, thereby increasing (vorst case) the evaporation rate of the spilled' electrolyte. Equations provided in NUREG 0570, " Toxic Vapor Concentrations in the Control Roon Folle.cing a Postulated Accidental Release," and applicable to a spill in a confined area with ventilation, were used to calculate the evaporation rate of sulfuric acid vapors. The evaporation rate of acid is such that the toxicity licit for occupational e::posure of 2 nilligra=s per cubic ceter presented in Regulatory Guide 1.78 is not closely approached. Therefore, it is concluded that a loss of electrolyte vill not jeopardize control roon habitability. h-

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