ML20055E239
| ML20055E239 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/03/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20055E235 | List: |
| References | |
| NUDOCS 9007110201 | |
| Download: ML20055E239 (2) | |
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NUCLE AR REGULATORY COMMISSION 1
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION i
RELATED TO AMENDMENT NOS.128 AND 112 TO FACILITY OPERATING LICENSE N05. NPF-4 AND NPF-7 VIRGINTA ELErTRIC AND POWER COMPANY OLD DOMINION ELECTRIC COOPERATIVE NORTH ANNA POWER STATION. UNITS NO.-1 AND N0. 2 DOCKET NOS. 50-338 AND 50-339 INTRODUCTION By letter dated March 26,1990, the Virgin-Electric and Power Company (the l
licensee)proposedchangestotheTechnicaiSpecifications(TS)fortheNorth Anna Power Station, Units No I and No. 2 (NA-182). The proposed changes would add a surveillance requirement to clean and inspect the diesel fuel oil storage tanks. The additional surveillance requirement will enhance emergency-i diesel generator reliability by way of cleaning and inspecting the tanks.
DISCUSSION N
Two underground fuel oil storage tanks are available to provide sufficient fuel to operate two emergency diesel generators at full load for 7 days in 1
accordance with the NA-1&2 design basis. They are missle-protected, seismic Category 1 tanks. Each underground 50 000 gallon tank is fed by gravity from a 210,000 gallon above-ground main fuel oil storage tank and can also be fed r
by emergency, seismic Category 1, tornado, missile, and flood-protected truck fill line connections.
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General industry experience has indicated that periodic cleaning and inspection of underground tanks is prudent. However, the tanks must be removed from sarvice in order to perform perhdic cleaning and/or inspectioh.
ThecurrentactionstattmentsinTS3.8.1.1(uder1through4)andTS3.8.1.2
(_ modes 5 and 6) do not provide for temporary removal of a tank from service.
The proposed changes would add a surveillance requirement to clean and inspect-L the diesel fuel oil storage tanks at least once per 10 years. The appropriate action requirement would also be modified to allow removal from service of one tank for up to 7 days for anticipated maintenance to the tank or associated components.
lL Provisions are established in the proposed changes to ensure that with one tank out of service, a minimum of 100,000 gallons of fuel would be available i
from the above-ground tank and arrangements would be made to ensure that an additional 50,000 gallons of fuel oil could be delivered in less than a 48-hour period if required. This would ensure operation of the required two h$$71 M bb 8
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s' emergency diesel generators (one per unit) at full load for 7 days, since the i
tank remaining in service would provide fuel to operate the two emergency diesel generators for at least 31/2 days at full load and backup capabilities to refill the tank are established.
The provision to have a source of fuel oil and transportation to supply 50,000 gallons of fuel in less than a 48-hour period is pre-coordinated through the licensee's fuel procurement department. The fuel procurement department has i
agreements in place with several fuel suppliers to obtain normal and emergency j
supplies of fuel oil when required.
i EVALUATION The proposed changes do not alter the conditions or assumptions of the NA-182 accident analysis or the basis of the current TS. The consequences of a diesel generator failure are unchanged. Fuel oil would be available to supply one diesel generator per tnit with sufficient fuel to meet the requirement for fill-load operation fo.' 7 days.
Finally, emergency diesel generator reliability will be improved by clei.ning and inspection of the diesel fuel oil storage tanks-Based on the abov0, we find the proposed changes to be acceptable.
ENVIRONMENTAL CONSIDERATION These amendments involve a change to a requirement with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes surveillance requirements. We have determined that the amendments involve no significant increase in the amounts, and no significant change in the types, of any effluents that may be released offsite, and that there is no significant increase in individual or. cumulative occupational radiation exposure. The Commission has previously issued a proposed finding
- that these amendments involve no significant hazards consideration and there has been no public conenent on such finding. Accordingly, these amendments meet theeligibilitycriteriaforcategoricalexclusionsetforthin10CFR51.22(c)(9).
Pursuant to 10 CFR 51.22(b),in connection with tie issuance of these amendments no environmental im>act statement or environmental assessment need be prepared CONCLUSION We have concluded, based on the considerations discussed above that(1)there isreasonableassurancethatthahealthandsafetyofthepub1Icwillnotbe endangered by operat hr in the proposed manner and(2)suchactivitieswill I
be conducted in compliance with the Comission s regulations, and the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.
Date: July 3,1990 Principal Contributor:
Leon B. Engle f
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