ML19294B017
| ML19294B017 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 02/25/1980 |
| From: | Brown S VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Parr O Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0578, RTR-NUREG-578 155, NUDOCS 8002260587 | |
| Download: ML19294B017 (6) | |
Text
{{#Wiki_filter:* ,h' t vinc,INI A E L ECT HC AND PO NER COMP AN Y mCHMONO. VIRGINI A 23261 February 25, 1980 Mr. Harold R. Denton, Director Serial No. 155 Office of Nuclear Reactor Regulation PSE&C/LTW:adw:mc Attn: Mr. O. D. Parr, Chief Light Water Reactors Branch No. 3 Docket No. 50-339 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D. C. 20555
Dear Mr. Denton:
One of the concerns stated in the Three Mile Island Action Plan is in regard to the habitability of the control room following a postulated release of hazardous chemicals. We have reviewed the design of the North Anna Units 1 and 2 control room to determine its compliance with existing Regulatory Guides and Standard Review Plan requirements for control room habitability. These require-ments are outlined by Regulatory Guide 1.78, " Assumptions for Evaluating the Habitability of a Nuclear Power Plant Control Room Curing a Postulated ilazardous Chemical Release," Regulatory Guide 1.95, " Protection of Nuclear Power Plant Control Room Operators Against an Accidental Chlorine Release," and Standard Review Plan Sections 2.2.1, 2.2.2, 2.2.3, and 6.4. Our compliance with these documents is described in the following paragraphs. Standard Review Plan Sections 2.2.1, 2.2.2, 2.2.3, and 6.4 establish cer-tain criteria to be used in reviewing compliance with Regulatory Guides 1.78 and 1.95 and do not require response by the licensee. Regulatory Guide 1.95 describes design features and procedures which would mitigate hazards to control room operators from an accidental chlorine release. As stated in response to Question 52.14 of the FSAR, no gaseous chlorine is used on site. Liquified chlorine is not stored on site except small quantities for laboratory use, 20 lbs or less, as allowed by the Regulatory Guide. Therefcre, North Anna Units 1 e.nd 2 comply with Regulatory Guide 1.95. Regulatory Guide 1.78 requires that the habitability of the control room be evaluated for a postulated release of chemicals located within a five mile radius of the reactor facility. As stated in Section 2.2 of the FSAR, there are no manufacturing plants, chemical plants and storage facilities, major water trans-portation routes or oil and gas pipelines within five miles of the plant site. This leaves the following conditions to be evaluated: (a) chemicals shipped on roads within five miles of the plant at a frequency of ten or more per year, and in weights as outlined by the Regulatory Guide, and (b) chemicals stoted on site in a quantity greater than 100 pounds. 800226058]
4 i Mr. Harold R. Denton 2 The following roads pass within five miles of the plant site: Distance (Mi) and Direction from Site Secondary State Road 652 1 1/2 S Secondary State Road 601 2 NE Primary State Road 208 2 NW U. S. Route 522 5 WNW There is no specific data available on the types, quantities and frequency of chemical shipments along these routes; however considering the lack of chemical and industrial facilities along Routes 652, 601, and 208 and considering the distance between Route 522 and the plant site, it is expected that there are no chemicals shipped along these routes at a frequency and weight great enough to require evaluation in accordance with the Regulatory Guide, and certainly none that would pose a hazard to the habitability of the control room. The following potentially hazardous chemicals are stored on the plant site in a quantity greater than 100 pounds: hydrogen, nitrogen, carbon dioxide, sulfuric acid, anmonia hydroxide, acetone, and hydrazine. The worst case accidental release of each type of chemical is evaluated on the attached Table I. The evaluations for sulfuric acid, ammonia hydroxide, acetone and hydrazine are incomplete but are not expected to pose a ha7ced. The results of these eval-uations will be forwarded to you by March 5,1980. The evaluation for nitrogen indicates that the concentration of the chemical within the control roora was less than the toxicity limit for that chemical. These cases were evaluated on the basis of normal ventilation systems operating and with no action being taken by the control room operator. For carbon dioxide, a toxicity limit of 1.0 percent by volume is indicated in Table C-1 of the Regulatory Guide; however Sax's " Dangerous Properties of Industrial Materials-Fifth Edition," which Table C-1 is supposedly adapted from, states that carbon dioxide is an asphyxiant. Again according to Sax, an asphyxiant concentration of 33 percent in the mixture of air and gas is required before appreciable symptoms develop. The maximum concentration of carbon dioxide in the control room following the postulated release of the largest storage con-tainer is less than 2 percent which is well below the toxicity limit for an asphyxiant. Therefore, no hazard is presented to control room personnel.
s Mr. Harold R. Denton 3 Based on the evaluations described in the previous paragraphs, North Anna Units 1 and 2 comply with the requirements for control room habitability as out-lirr by Regulatory Guides 1.78 and 1.95. Please contact us if there are any q o cions or discussicn. .9 trul you ( Sam C. Brown,'Jr.I 8at Q& / Powr/iorVicePresident[ Ser Station Engineeri and Construction Enclosures
M' PSE&C TABLE I - Q D1ICAL SIORAGE 022580 AND CONTROL ROOM HABITABILITY LVALUATIONS Serial No. 155 CIE4ICAL NOR%E SIORA2 AREAS 1 pg g m g gg m Distance thxinun Frcxn C. R. Type of Concentration To icity Quantity location Air Intake Release in C.R. (pin) 2 Limit (ppm)
- 1. Hydrogen 700 lb Storage Tank, N.
N/A N/A Hydrogen frcun any potential of Turbine Bldg. release would be dispersed to the atnesphere before reaching the control rtxxn air intake.
- 2. Carben Dioxide 34,000 lb l-FP-TK-5, N. of 200' N. of 34,000 lb 16,500 10,000 Turbine Bldg.
Intake Instantaneous 12,000 lb l-FP-TK-6, Col. 9-G in Auxiliary Bldg.
- 3. Nitrogen 4,500 lb Tube Trailer, S.
420' S. of 4,500 lb 10,000 Asphyxiant of Unit 1 Con-Intake Justantaneous taintmnt
- 4. Sulfuric Acid 1,700 gal 1-WP-TK-5, Col.
Evaluation Incxxrplete 8-B in Turbine Bldg.
- 5. Annonia Hydroxide 55 gal Drum Storage Area Evaluat. ion Inncxrplete 100 (30% solution by adjacent to Ware-weight) house 2 55 gal Col 7-C in Tur-bine Bldg.
- 6. Acetone 55 gal Drum Storage Area Evaluation Inccxrplete 2,000 adjacent to Ware-house 2
PSE&C 022580 Serial No. 155
- 7. Hydrazine 200 gal 1-Wr-TK-1, Col Evaluation Incm plete (35% solution by 7b-C in Turbine weight)
Bldg. 200 gal 2-Wr-TK-1, col 15 -C in Tur-bine Bldg. 100 gal 1-AB-TK-5, Col 17 -Cz in Ser-vice Bldg.
- 8. Boric Acid 7,500 gal 1-CII-TK-1A, N/A N/A Insignificant vapor given off at ambient temperature (22,500 ppn Col 9-H in solution)
Aux. Bldg. 7,500 gal 1-CII-TK-1B, Col 9-II in Aux. Bldg. 7,500 gal 1-CII-TK-lC, Col 9-II in Aux. Bldg.
- 9. Sodiun Ilydroxide 700 gal 1-Wr-TK-18, N/A N/A Insignificant vapor given off (25% solution by Col 9-B in at ambient tempPrature weight)
Turbine Bldg.
- 10. Sodiun IIypochlorite 15,000 gal 1-SN-TK-3A, N/A N/A Insignificant vapor given off at ambient tmperature (15% solution by Service Water weight)
Puiphouse 15,000 gal 1-SW-TK-3B, Service Water Pumphouse 3,000 gal 1-BC-TK-2, Col 10-B in Tur-bine Bldg.
PSE&C Serial 022580 No. 155
- 11. Calcon CL-14 3,200 gal 1-BC-TK-1, Col N/A N/A Insignificant vapor given off 2 -X in Tur-at ambient tarperature bine Bldg.
500 gal 1-SW-TK-4, Service Water Pumphouse
- 12. Urea Formaldyhyde 4,500 gal 1-IN-TK-16A, N/A N/A Insignificant vapor given off at ambient temperature Decontamina-tion Bldg.
1-IN-TK-16B, Decontamina-tion Bldg. 1. Quantities less than 100 pounds and chemicals stored and used in solid form are not listed. Evaluations are based on control roan normal ventilation air exchange rate of.92 volume changes per hour. 2. Carbon dioxide is an asphyxiant according to Sax's " Dangerous Properties of Industrial buterials - Fifth Edition" 3. and as such would have a toxicity limit of 33 percent. t
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